全部
  • 全部
  • 产品管理
  • 新闻资讯
  • 介绍内容
  • 企业网点
  • 常见问题
  • 企业视频
  • 企业图册
+
  • u=2291182070,2568621198&fm=26&gp=0.jpg

SHBC Rotary regenerative heat exchanger

key word:Heat exchange element


Product description

SBC rotary regenerative heat exchanger

 

1. Introduction

1.1 purpose

It is mainly used as waste heat recovery equipment

1.2 working principle of rotary heat exchanger

After the flue gas enters the heat exchanger, the heat storage element inside the rotor is heated. After the rotor turns to the air side, the heat carried by the heat storage element is released to the air flowing through the rotor. The rotor rotates continuously and the heat exchange process continues.

1.3 model significance

2-34Ⅵ-T-2100-2300-SMR

2 --- number of heat exchangers for each boiler

34 VI -- model type (V is vertical arrangement with hot end at the bottom; Ⅵ is vertical arrangement with hot end on top; H is horizontal arrangement)

T -------- Sections (T refers to tri-section; Q refers to Quarter-section; omits to Bi-section)

2100 -------- height of hot surface (mm)

2300 -------- maximum allowable height (mm)

SMR -------- rotor structure form (SM is half module type; M is full module type; R is cylinder shape; omitted is octagonal shape.)

1.4 product series

The most basic parameter characterizing the heat exchanger is the inner diameter of the rotor shell plate. The type of heat exchanger used should be corresponding to it (see table 4-1). Heat exchangers smaller than 24.5 are not used on large boilers, so the data are not listed.

Table 4-1 product series of  Ljungstrom heat exchanger

Model Rotor Inner diameterm common speedr/min Structure forms the rotor can be used in Optional number of rotor compartments
24.5 6.89 1.56 Two pieces assembly, half module 12182436
25 7.2 1.5 Two pieces assembly, half module 12182436
25.5 7.62 1.42 Two pieces assembly, half module 12182436
26 7.93 1.36 Two pieces assembly, half module 12182436
26.5 8.25 1.49 Two pieces assembly, half module 12182436
27 8.65 1.42 Two pieces assembly, half module 12182436
27.5 9.01 1.36 Two pieces assembly, half module 12182436
28 9.47 1.3 Two pieces assembly, half module 12182436
28.5 9.93 1.2 Welding assembly, half module 243648
29 10.33 1.15 Welding assembly, half module, full module 243648
29.5 10.84 1.1 Welding assembly, half module, full module 243648
30 11.3 1.05 Welding assembly, half module, full module 243648
30.5 11.83 1.12 Welding assembly, half module, full module 243648
31 12.39 1.07 Welding assembly, half module, full module 243648
31.5 12.95 1.03 Welding assembly, half module, full module 243648
32 13.5 0.99 Welding assembly, half module, full module 243648
32.5 14.25 1.28 Welding assembly, half module, full module 243648
33 14.95 1.23 Welding assembly, half module, full module 243648
33.5 15.62 1.24 Welding assembly, half module, full module 243648
34 16.4 1.19 Welding assembly, half module, full module 243648
34.5 17.25 1 Welding assembly, half module, full module 364860
35 17.1 1 Welding assembly, half module, full module 364860
35.5 18.91 1 Welding assembly, half module, full module 364860
36 19.83 1 Welding assembly, half module, full module 364860

 

1.5 structural features

SHBC rotary air heat exchanger is the latest technology imported from ALSTOM company. It has the advantages of advanced technology, good reliability, reasonable design structure and quick installation. There are many design methods to meet the actual needs of different users.

1.5.1. Shape and distribution. According to the shape of the rotor shell, the heat exchanger can be divided into square shape (only used for small integral factory heat exchanger), octagonal heat exchanger and cylindrical heat exchanger; according to the number of smoke and air compartments, it can be divided into bi-section, tri-section and quarter-section heat exchanger.

1.5.2. Rotor structure. SHBC adopts the modular structure to design the rotor of large heat exchanger, and adopts the combination of pin shaft and welding on site, which can effectively speed up the installation progress. Two typical rotor combination modes are welding assembled rotor structure and modular rotor structure.

1.5.3. Heat transfer elements. The waveforms of heat exchanger elements in SHBC are Du series, dun series, FNC series, Cu series, NF series, UNF series and dnf series.

1.5.4. Replacement method of heat transfer elements. Each layer can be designed to be suspended from above and replaced by drawer type from the side.

1.5.5. Air leakage control. SHBC has adopted a series of advanced sealing control means, including multiple seals, end face bypass seals at cold ends, Welded static seals instead of gap seals for sealing plates, follow-up seals at the ends of sealing plates, pressurization and purging sealing systems, effective hot end gap tracking system and hot end sector plate follow-up adjustment.

1.5.6. Transmission device. The belt drive and center drive are generally adopted for small units of preheater (diameter less than 12m), which are determined by users; for large diameter heat exchanger, it is recommended to adopt the belt drive mode which is less affected by the change of rotating torque and reliable in operation.

Formula,

1.5.7. Bearing system of heat exchanger. The guide bearing of heat exchanger adopts double row centripetal spherical roller bearing, and the new design uses expansion sleeve to connect the heat exchanger shaft and bearing, thus avoiding the possibility of rotor deflection caused by loose locking bolt of connecting sleeve. The support bearing adopts spherical thrust bearing, and the bearing safety information rate is higher than 10 times, which ensures the long-term and reliable use of the bearing. The guide and support bearings are equipped with lubricating oil stations, which can timely cool and filter the lubricating oil, and effectively improve the working conditions of bearings.

1.5.8. Fire alarm and fire fighting devices. SHBC has designed two kinds of fire alarm and fire-fighting devices, which are infrared probe and thermocouple probe. Large diameter nozzles are used in the fire pipe network of all lattices arranged above the heat exchanger to ensure that all rotor surfaces are covered and sufficient water is provided to meet the needs of rapid fire extinguishing.

1.5.9. Cleaning and soot blowing system. The upper and lower parts of the heat exchanger rotor are equipped with a set of soot blowing system and cleaning system. The cleaning system is separated from the soot blowing system, and the large flow pipeline is used. The cleaning of the heat exchanger can be completed within 1 hour. For the heat exchanger with high cold section layer (equipped with SCR boiler and flue gas heat exchanger), the soot blower is designed with double medium (steam + high pressure water) double soot blowing pipe, which can be used for on-line micro high pressure water flushing.

1.5.10. Shutdown alarm system. The system is used to monitor the rotation of the rotor. It consists of an induction hoop installed on the support end shaft of the heat exchanger and an induction probe fixed on the lower beam of the heat exchanger. The display accuracy of the rotor speed is 0.03r/min

 

2. Main interface parameters

The rotary heat exchanger is a standardized series design. The shape of the heat exchanger is shown in figure 4-1 (tri-section, 50 ° primary air angle, type VI),

The interface size is shown in Table 4-2. For the air heat exchanger used for transformation, the interface size can be adjusted according to the actual situation.

Table 4-2 interface dimensions of SMR tri-section heating exchanger  with 50 ° primary air bin angle (mm)

Model A B C D E G J K M N P
24.5 1969 1219 6375 4559 1207 1067 914 3950 1059 3950 1143
25 2121 1219 6680 4712 1359 1168 914 4100 1100 4100 1143
25.5 2324 1219 7087 4915 1562 1321 914 4300 1154 4300 1143
26 2477 1219 7391 5067 1715 1422 914 4460 1194 4460 1143
26.5 2680 1219 7798 5271 1918 1524 914 4660 1248 4660 1219
27 2870 1219 8179 5461 2108 1651 914 4850 1300 4850 1372
27.5 3048 1219 8534 5639 2286 1778 914 5030 1346 5030 1372
28 3264 1219 8966 5855 2502 1905 914 5250 1405 5250 1372
28.5 3251 1613 9728 6541 2578 1600 1219 5630 1508 5630 1473
29 3442 1613 10109 6731 2769 1727 1219 5820 1559 5820 1473
29.5 3670 1613 10566 6960 2997 1905 1219 6050 1619 6050 1473
30 3874 1613 10973 7010 3200 2057 1219 6250 1675 6250 1473
30.5 4140 1613 11506 7430 3467 2235 1219 6520 1746 6520 1651
31 4394 1613 12014 7684 3721 2413 1219 6770 1815 6770 1651
31.5 4661 1613 12548 7950 3988 2616 1219 7040 1886 7040 1727
32 4915 1613 13056 8204 4242 2794 1219 7290 1954 7290 1727
32.5 5131 1765 13792 8573 4426 2896 1422 7660 2053 7660 1981
33 5461 1765 14453 8903 4756 3150 1422 8000 2143 8000 1981
33.5 5791 1765 15113 9233 5086 3378 1422 8360 2240 8360 2083
34 6109 1765 15748 9550 5404 3632 1422 8730 2338 8730 2083
34.5 6414 1905 16637 9995 5683 3810 1422 9170 2457 9170 2210
35 6795 1905 17399 10376 6064 4089 1422 9600 2573 9600 2286
35.5 7176 1905 18161 10757 6445 4343 1422 10020 2685 10020 2286
36 7595 1905 19000 11176 6864 4648 1422 10480 2807 10480 2286

 

3. Selection method

3.1 selection calculation

The selection of heat exchanger is completed by computer program. The program uses numerical calculation method to accurately calculate the temperature field data, resistance data and air leakage data of the metal and fluid in the heat exchanger rotor. The heat transfer and resistance calculation parameters are from the data provided by Alstom laboratory. The selection of heat exchanger diameter is based on the parameters of exhaust gas or hot air temperature, allowable maximum resistance, etc. The type and configuration of heat transfer elements are determined according to the analysis data of fuel and ash.

3.2. Parameters required for model selection

If the heat exchanger and boiler required by the user are supplied by our factory, there is no need to provide a special type selection parameter table for the heat exchanger, and the boiler calculation process will calculate the preheater parameters at the same time; if the heat exchanger is used for transformation, separate purchase or non boiler equipment, the basic selection parameters shall be provided according to table 4-3 (the smoke and air flow value shall be provided according to the total quantity of one unit)

 

Table 4-3 basic modeling parameters of rotary heat exchanger

Item Content Bi-section Tri-section Quarter-Section Remarks
Peripheral parameters Site altitude of 0m or atmospheric pressurem,Mpa) required required required
Number of heat exchangers required (Unit) required required required
Layout (indoor / outdoor) required required required
Arrangement direction of main shaft required required required Vertical or horizontal
Smoke air flow direction required required required Or hot end position of heat exchanger
Is a hot end gap tracking device required With/without With/without With/without The preheater with diameter more than 12m is required by default
Average ambient temperature and variation range(℃) required required required
Average air humidity and variation range% required required required
Air or secondary air inlet heating mode required required required Heater or hot air recirculation
Heating mode of primary air inlet required If with If with Generally not required
Fuel or flue gas composition parameters Fuel industry analysis data required required required
Fuel element analysis data required required required
Fuel consumptiont/h see remarks see remarks see remarks If there is smoke, air flow can be saved
Excess air coefficient at flue gas inlet see remarks see remarks see remarks If there is smoke composition, it can be saved
Excess air coefficient at outlet see remarks see remarks see remarks If there is hot air flow, it can be saved
Ash composition analysis data (%) required required required Oil gas fuel is not required
Ash flow and specific heat capacity see remarks see remarks see remarks Only required for high ash coal
Input and required smoke air flow Flue gas flow into heat exchanger (kg / s) required required required
Required hot air or hot secondary air flow (kg / s) required required required It is the amount of hot air at the outlet of heat exchanger with bi-section
Total primary air flow required (kg / s) required required required Flow after mixing in front of pulverizer
Input and required temperature parameters Flue gas inlet temperature () required required required 430
Air or secondary air inlet temperature () required required required
Primary air inlet temperature () required required required
Required temperature of primary air before pulverizer () required required required
Input pressure and allowable resistance Flue gas inlet pressure (kPa) required required required
Pressure of hot air or hot secondary air (kPa) required required required
Primary air pressure at heat exchanger outlet (kPa) required required required
Performance guarantee requirements Allowable maximum air leakage rate required required required The default value is less than 6% within 1 year and 8% within 4 years
Allowable maximum smoke or air resistance (kPa) required required required By default, the flue gas resistance is less than 1.3kpa
Required exhaust gas temperature or minimum hot air / hot primary air temperature () required required required Select one item, and the smoke exhaust temperature should be indicated as after or before air leakage correction

 

3.3 system supporting conditions

3.3.1. Power supply conditions. AC and DC, voltage level, frequency, phase and other parameters.

3.3.2. Instrument air source. Purity, pressure, available gas volume and other parameters.

3.3.3. Soot blowing steam. Temperature, pressure, available gas and other parameters, the general requirements are 1 ~ 1.4mpa, 320 ~ 350 ℃

3.3.4. Dynamic compressed air. If the pneumatic motor is required, the pressure should be 0.6-0.8 MPa.

3.3.5. Fire water. The required pressure is 0.6 ~ 0.8 MPa, and the water quantity is supplied from the water supply circuit of the fire protection system according to the design requirements.

3.3.6. Cooling water. For bearing lubricating oil station, the required pressure is 0.2 ~ 0.5 MPa, the water quality is ordinary tap water or relatively clean neutral industrial water, and the water quantity shall meet the design requirements.

3.4 special supply requirements

3.4.1. Whether the turning pneumatic motor is required, whether the auxiliary drive motor needs DC motor or pneumatic motor.

3.4.2. Whether enamel surface material is required for cold end heat transfer elements, and whether there are special requirements for thickness and material of heat transfer elements at hot end.

3.4.3. Service life requirements of heat transfer element, bearing and reducer.

3.4.4. Whether hot end soot blower is required (generally only for lignite fuel).

3.4.5. Spare parts requirements for random operation within 3 years.

3.4.6. Whether the lubricating oil station needs double pump system.

3.4.7. Whether there are special size requirements for the interface of smoke and air duct.

3.4.8. Whether there are special size requirements for the heat exchange calling structural parts.

3.4.9. Whether it is necessary to set up the local transmission device control box, whether the soot blowing program control needs to separately control the system (generally included in the boiler program control), the local control box of the lubricating oil station (generally controlled by DCs), and whether additional temperature and pressure measuring instruments are needed.

3.4.10. The default design and supply interface of the heat exchanger are the connection flange of the flue gas duct and the body shell; the local cable is the primary measuring element and local connecting cable inside the system, excluding the cable between DCs and DCS. If necessary, it shall be specified.

3.4.11. Specific requirements for painting and thermal insulation.

3.4.12. Delivery place requirements.

3.4.13. Format and language requirements of instructions and drawings.

3.4.14. Whether on-site measurement is required (for renovation project).

3.4.15. The rotation direction of the heat exchanger is reversed by default, that is, heating the secondary air first and turning to flue gas → secondary air → primary air → flue gas.

 

4. Scope of supply and order requirements

The typical scope of supply includes supply interface location agreement, heat exchanger body components, sealing and static sealing, free expansion guide device, sealing system, heat transfer element, heat exchanger transmission device, fire detection equipment for heat exchange shouting, automatic air leakage control system at hot end, rotor stop alarm equipment, bearing and lubrication equipment of heat exchanger, soot blowing equipment, fire fighting and cleaning equipment, maintenance Door and observation door hole, body maintenance and repair platform, special tools, thermal insulation and painting, local measuring instruments, random spare parts, nameplates and marks.