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VN rotary flue heat exchanger (GGH)

key word：Heat exchange element

Category:

Flue desulfurization equipment

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Product description

VN rotary flue gas heat exchanger (GGH)

1. Introduction

1.1. Purpose

With the increasing emphasis on environmental protection, the state's control of flue gas emissions is more and more strict. For the control of sulfur dioxide emissions in thermal power plants, most power plants adopt flue gas desulfurization (FGD). Wet limestone desulfurization technology is relatively mature, with high desulfurization efficiency and reliable operation, so the technology has been widely used.

In the wet limestone / gypsum desulfurization technology, the temperature of flue gas passing through the desulfurization tower is 45 ~ 55 ℃. Generally, GGH is used in power plants to heat the net flue gas with the heat of the original flue gas (generally the inlet temperature of the original flue gas is 120 ~ 130 ℃), so that the flue gas temperature can reach about 80 ℃, and then it is discharged from the chimney. In wet FGD, the advantage of GGH is very significant.

1.2. Model meaning

29.5 (G) V(H) N(A，S，F) (T，Q，C )1500

29.5 --- -rotor flow area serial number

(G) -----When there is "g", it means flue gas heat exchanger; if not, it means air preheater

V (H) ---- V indicates that the rotor shaft is arranged vertically; H indicates that the rotor shaft is arranged horizontally

N (a, s, f) ---- n means that the sector plate and axial sealing plate are not adjustable. A indicates that the sector plate at the hot end is adjustable in two positions. S indicates that the hot end sector plate is of automatic tracking type and adjustable. F indicates that the hot and cold end sensors are adjustable.

(T, Q, c) ---- form of air preheater

1500 -------- total height of heat exchange elements (mm)

1.3. Structural features

1.3.1.ggh rotor is made of corten steel plate, and the rotor is divided into compartments along the radial diaphragm of the rotor central cylinder.

1.3.2. The transition flue is used to transfer fluid into and out of the GGH rotor, which is located on the original flue gas side and the clean flue gas side on both sides of the rotor. The transition pipe is made of steel plate and coated with glass flakes as required to prevent corrosion.

1.3.3. The sealing design of GGH is based on the principle of air leakage control technology and has been confirmed by the successful operation experience of a large number of units in the world. The design of fixed non adjustable sector plate and rotor double seal not only makes GGH have very low air leakage rate, but also achieves the purpose of stable long-term operation in overhaul interval.

1.3.4. The low leakage control system of GGH is composed of isolation air and / or cleaning air according to the leakage rate provided, and the system is composed of one-to-one fans and relevant pipes. The low leakage fan exhausts gas to the outlet side of the clean flue gas of GGH. After passing through the pipe, it is ejected from the nozzle set on the upper sector plate to form isolation air, and it is ejected through the slot hole on the side of the upper fan-shaped plate without desulfurization to form the cleaning air. If GGH is equipped with a low leakage system, all auxiliary pipelines within GGH are in the scope of supply.

1.3.5. GGH seal air system. The system is composed of a small diameter circular pipe of the blower. The system also includes relevant valves, pressure indicator, baffle plate with manual control, foundation steel frame and driving motor.

1.3.6. GGH plated enamel heat exchange elements. The enamel on the heat exchange element is specially designed for GGH corrosion protection of FGD, while Houghton adopts advanced dry electrostatic spraying technology. This process ensures that the coating has high adhesion (tightness) performance, the surface is complete and the thickness is uniform. Under the thin coating thickness, the porosity is low and the corrosion resistance to acid and water is obtained.

1.3.7. GGH cleaning device. The general cleaning methods are air or steam soot blowing, low pressure water washing and high pressure water washing. Each GGH is equipped with 1 or 2 sets of Houghton GGH fully retractable soot blowing and cleaning devices according to the demand, one set is arranged at the inlet side of the original flue gas, and the other is arranged at the outlet side of the original flue gas. During operation, the motor drives the cleaning device to run along the radial direction of the rotor, and the operation of the cleaning device enables the nozzle to cover the whole rotor when the rotor rotates. The same nozzle is used for soot blowing and low pressure water flushing. Suitable stainless steel material shall be used for blowing gun which is always in contact with flue gas.

1.3.8. Anti corrosion treatment of GGH. The housing and some key components of the GHG are coated with glass flakes.

2. Main technical parameters

The configuration and main technical parameters of VN flue gas heat exchanger are shown in Fig. 7-1 and table 71

Table 7-1 main technical parameters of VN flue gas heat exchanger

Dimensions Series No.	A	B	C	D	E	F	G	H	K	K₂	L	M	N	P	Q	R	Rotating arm radius
22	2806	925	3235	560	1200	1650	80	80	760	500	300	1881	2244	3115	1480	1340	2885
22.5	2920	925	3350	560	1200	1650	80	80	760	500	300	1995	2336	3230	1480	1388	3000
23	3048	925	3480	560	1200	1650	80	80	760	500	300	2123	2439	3360	1480	1441	3130
23.5	3182	925	3615	560	1200	1650	80	80	760	500	300	2257	2546	3495	1480	1497	3265
24	3316	925	3750	560	1200	1650	80	80	760	500	300	2391	2653	3630	1480	1553	3400
24.5	3658	1250	4095	800	1200	1650	80	80	925	500	300	2408	2927	3975	1645	1696	3745
25	3812	1250	4250	800	1200	1650	80	80	925	500	300	2562	3049	4130	1645	1760	3900
25.5	3975	1250	4415	800	1200	1650	80	80	925	500	300	2725	3180	4295	1645	1829	4065
26	4149	1250	4590	800	1200	1650	80	80	925	500	300	2899	3319	4470	1645	1901	4240
26.5	4352	1250	4795	800	1200	1650	80	80	925	500	300	3102	3482	4675	1645	1986	4445
27	4546	1250	4990	800	1200	1650	80	80	925	500	300	3296	3636	4870	1645	2067	4640
27.5	4744	1250	5190	800	1200	1650	80	80	925	500	300	3494	3795	5070	1645	2150	4840
28	4987	1250	5435	800	1200	1650	80	80	925	500	300	3737	3989	5315	1645	2251	5885
28.5	5210	1600	5660	1100	1600	1750	110	80	1145	500	375	3610	4168	5540	1910	2344	5310
29	5448	1600	5900	1100	1600	1750	110	80	1145	500	375	3848	4358	5780	1910	2444	5550
29.5	5701	1600	6155	1100	1600	1750	110	80	1145	500	375	4101	4560	6035	1910	2549	5805
30	5993	1600	6450	1100	1600	1750	110	80	1145	500	375	4393	4794	6330	1910	2672	6100
30.5	6271	1600	6730	1100	1600	1750	110	80	1145	500	375	4671	5017	6610	1910	2788	6380
31	6563	1600	7025	1100	1600	1750	110	80	1145	500	375	4963	5250	6905	1910	2910	6675
31.5	6955	1850	7420	1300	1600	1750	110	80	1145	500	375	5105	5564	7300	1910	3073	7070
32	7277	1850	7745	1300	1600	1750	110	80	1145	500	375	5427	5822	7625	1910	3208	7395
32.5	7619	1850	8090	1300	1600	1750	110	80	1145	500	375	5769	6095	7970	1910	3351	7740
33	8040	1850	8515	1300	2000	1850	140	80	1145	500	500	6190	6432	8395	2005	3527	8165
33.5	8472	2000	8950	1450	2000	1850	140	80	1145	500	500	6472	6777	8830	2005	3707	8600
34	8898	2000	9380	1450	2000	1850	140	80	1145	500	500	6898	7118	9260	2005	3885	9030
34.5	9324	2000	9810	1450	2000	1850	140	80	1145	500	500	7324	7459	9690	2005	4063	9460
35	9800	2000	10290	1450	2000	1850	140	80	1145	500	500	7800	7840	10170	2005	4262	9940
35.5	10281	2000	10775	1450	2000	1850	140	80	1145	500	500	8281	8225	10655	2005	4463	10425
36	10806	2200	11305	1600	2400	1900	170	80	1320	500	500	8606	8645	11185	2150	4683	10955
36.5	11342	2200	11845	1600	2400	1900	170	80	1320	500	500	9142	9073	11725	2150	4906	11495
37	11922	2200	12430	1600	2400	1900	170	80	1320	500	500	9722	9537	12310	2150	5149	12080

3. Selection method

Howden adopts computer model selection, which can meet the requirements of users to the maximum extent. If users want to use Houghton flue gas heat exchanger, they should provide the following data.

3.1. Performance parameters

The following data, if available, shall be included in the user's inquiry:

3.1.1. Flue gas flow direction, such as whether the flow direction is vertical or horizontal.

3.1.2. Matching of flue gas desulfurization system, number of flue gas reheaters and number of boilers.

3.1.3. Location of flue gas heat exchanger, such as indoor or outdoor.

Altitude or atmospheric pressure.

3.1.5. Properties of the fuel being burned.

3.1.6. Volume flow and mass flow of flue gas in flue gas heat exchanger.

3.1.7. Smoke composition.

3.1.8. Ambient humidity and temperature range and average value.

3.1.9. Average metal temperature at low temperature end.

3.1.10. Hot end pressure difference.

3.1.11. The maximum allowable leakage rate of raw flue gas shall be expressed as the percentage of population mass of flue gas or the change of O2 content in flue gas side. In this case, the oxygen content of flue gas shall be informed.

3.1.12. Performance guarantee requirements.

3.2. Site conditions

If the following site conditions can be provided, it will be helpful for the selection:

3.2.1. Voltage, phase and frequency of the power supply.

3.2.2. The pressure and temperature of soot blowing medium (such as steam or air) that can be provided.

3.2.3. Pressure, temperature and composition of water supply.

3.2.4. Compressed air provided.

3.3. Supply requirements

3.3.1. Any special material requirements for the structure (such as shell, transition steel duct, rotor, etc.).

3.3.2. Any special material, thickness and life requirements of heat exchange elements.

3. Specify whether there is a pipe type beyond the requirements of the pipe end plate and whether there is a need for the pipe end control of the soot blower.

At the same time, the supply shall be specified

3.3.4. Any additional requirements related to measuring instruments, such as voltage drop measuring instruments, bearing temperature measurement, etc., shall be specified. At the same time, the end points of the scope of supply shall be specified, such as junction box and conductor of electrical appliances. The actual scope of supply generally includes rotor stop alarm device, bearing oil temperature thermocouple, etc.

3.3.5. Number and type of driving motor, such as AC, DC or compressed air.

3.3.6. Any other requirements, such as locking bolts, etc.

3.3.7. Special requirements for surface protection and paint packaging.

3.3.8. Special delivery place.

3.3.9. Any requirements on document language.

3.3.10. Whether there are requirements for field test.

4. Scope of supply and order requirements

The scope of supply includes product design, procurement, manufacturing, factory testing, installation and commissioning drawings, operation and maintenance manual.

4.1. Plant and equipment

4.1.1. Rotor and heat exchange elements.

4.1.2. Rotor bearing.

4.1.3. Rotor seal.

4.1.4. Rotor housing.

4.1.5. Transition flue of flue gas heat exchanger and its necessary fixing parts.

4.1.6. Main bearing bracket.

4.1.7. Top and bottom platforms.

4.1.8. Driving device, including main and auxiliary AC motors and their frequency converters.

4.1.9. Access door.

4.1.10. Steam or compressed air soot blowing and water washing device, including local control cabinet.

4.1.11. Rotor speed and fault alarm.

4.1.12. Rotor bearing oil temperature thermocouple.

4.1.13. Inject lubricating oil for the first time.

4.1.14. Name plate.

4.1.15. Standard surface protective paint.

4.1.16. Special tools.

4.2. Termination point

4.2.1. End flange of flue gas inlet / outlet transition pipe shall be drilled according to customer requirements, excluding connecting bolts.

4.2.2. The connection point between bottom beam and side column of flue gas heat exchanger and steel frame of power plant boiler, excluding connecting bolts.

4.2.3. Upper and lower platforms of flue gas heat exchanger body structure.

4.2.4. Upper and lower soot blower steam and water pipe flange.

4.2.5. Motor terminals.

4.2.6. Flange of cooling water for bearing shell at the top of rotor.

4.3. Devices and equipment not included in the scope of supply

4.3.1. Connect the pipe and insulation baffle.

4.3.2. Expansion connection of pipeline at connection flange of flue gas heat exchanger.

4.3.3. Pipes, valves and instruments outside the flue gas heat exchanger.

4.3.4. Connecting wires and cables of electrical equipment.

4.3.5. Motor starter.

4.3.6. Lubricating oil (except for primary oil injection).

4.3.7. Slide rail beam and crane.