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HBC flue heat exchanger (GGH)

key word:Heat exchange element


Product description

HBC flue heat exchanger (GGH)

 

1. Introduction

1.1 purpose

flue heater (GGH) is a kind of equipment for heating low temperature flue with high temperature flue, which is often used in flue desulfurization system and flue denitrification system.

1.2 model significance

**-Ⅵ(G)-##-QMR

**-- GGH diameter size series number

VI - GGH type is vertical device

(G) - flue heat exchanger (GGH) (the model is determined according to the flue performance parameters provided by the user

## -------- height of heat exchange element (generally 10 mm as the first gear)

QMR -- full mode structure

1.3. Working principle

The flue heater absorbs heat from the original flue, and then transfers the heat to the net flue through a continuous rotating heat transfer element composed of special shaped metal plates.

1.4. Structural features

1.4.1. General layout features, FIG. 6-1 shows the GGH layout of flue desulfurization system. The flue from the dust collector enters the flue heat exchanger for heat exchange and cooling after boosting by the booster fan, and then enters the desulfurization device; after desulfurization, the temperature of flue drops to 40-55 ℃, after heat exchange, the temperature rises to 80-100c, and then enters the chimney.

Figure 6-2 shows the GGH layout of flue denitrification system. Since the denitration unit is installed after the desulfurization unit, the temperature of the catalytic reactor is low and the denitration efficiency is low. Therefore, it needs external heat (additional burner) to heat the flue to 350 ~ 400 ℃. Firstly, the flue passes through the desulfurization and dust removal system, and the temperature drops to about a (70 ℃), and enters the cold end of the flue heat exchanger (GGH), and receives the heat transferred by the high-temperature flue after denitration from the hot end, so that the flue temperature rises to B, and then the heat exchanger is heated to reach the required temperature ℃ of denitration catalyst. The temperature of the flue from the cold end of GGH drops to D, and is discharged to the chimney after being boosted by the induced draft fan.

1.4.2. Structural characteristics of main components. GGH adopts full mode, double seal, two compartment type, the main shaft is vertically arranged, the opening angle of the original flue side and the net flue side is 180 ° and the original flue and net flue flow in reverse direction. The flue heat exchanger is mainly composed of rotor, central cylinder and end shaft, rotor shell, upper and lower connecting plates and driving device, etc

1.4.2.1. The flue heat exchanger is supported by reliable thrust radial roller bearing, and the reliable double row radial spherical roller bearing is used as the guide bearing, so the structure is easy to be replaced; in addition, the flue heater shaft adopts reliable oil bath lubrication, does not need to be equipped with cooling system, and can ensure no oil leakage. In order to prevent dust and water from entering, the bearing box (cover) adopts reliable sealing device and is easy to overhaul.

1.4.2.2. The rotor adopts the full mode double seal fan-shaped warehouse structure. The advantage is that the rotor center cylinder mode fan-shaped warehouse is a pin joint structure, which does not need to be welded at the construction site, and there is no welding deformation, so as to reduce the welding workload on site. And the installation speed is fast.

1.4.2.3. The sealing system of flue heat exchanger is designed according to the thermal deformation of rotor, including central cylinder seal, radial seal, axial seal, bypass seal and static seal. GGH adopts double sealing structure, including double axial sealing and double radial sealing. The double sealing structure ensures that at least two sealing plates and sealing plates form two seals.

1.4.2.4. The heat transfer element is made of corrosion-resistant material enamel steel plate, and the heat transfer element box is made of corten steel with low temperature corrosion resistance. The plate type of heat transfer element is loose closed, easy to clean plate type du3e. The heat transfer element box is made into small components. During maintenance, the heat transfer element box can be extracted from the flue inspection door hole, which is very convenient for installation and replacement.

1.4.2.5. The rotor is driven by the central transmission device. Each transmission device contains two electric driving device motors, one is the main driving motor, the other is the auxiliary driving motor, and the main and auxiliary driving motors are standby for each other. The drive system is equipped with frequency conversion control system to control the start-up, purging and normal operation of GGH. If the main motor is out of service, the auxiliary motor will automatically switch to the running state to prevent the rotor from stalling. At the same time, GGH is equipped with rotor speed measurement device to track the change of rotor speed to ensure the safe and stable operation of GGH.

1.4.2.6. The flue heat exchanger is equipped with low leakage system and air sealing system, which can reduce the leakage of original flue to the clean flue side.

1.4.2.7. The flue heat exchanger is equipped with swing type soot blower or telescopic soot blower, and equipped with on-line high-pressure water, steam (or compressed air) soot blowing and offline low-pressure water washing device, so as to ensure that the flue heat exchanger is not easy to condense and deposit ash under normal operation and regular soot blowing.

1.4.2.8. All equipment and parts in contact with corrosive medium of flue heat exchanger shall be treated with anti-corrosion and scale coating.

1.5. Product series

The flue heat exchanger has formed a series of products which are suitable for boiler units of different capacity grades, and the models are 24-36.

 

2. Main technical parameters

The main technical parameters of the flue heat exchanger include the actual dry and wet flow of raw flue and net flue, standard dry and wet flow rate, dry and wet mass flow rate, pressure, temperature and medium composition of inlet and outlet flue under the condition of 100% BMCR of design coal.

 

3. Equipment appearance and structural dimensions

3.1. Outline drawing of flue heat exchanger

The outline of flue heat exchanger is shown in Fig. 6-3 and Fig. 6-4.

 

3.2 main appearance and interface dimensions

The main shape and interface dimensions include rotor diameter, total GGH height, height of heat transfer element, flue interface size, center truss size, support beam distance, vertical distance between lower interface flange and support beam, and guide bearing and transmission maintenance space size.

 

4. Selection method

The type selection is mainly based on the design parameters, flue medium composition, natural conditions (including ambient temperature, altitude, earthquake and wind load, etc.), and the appropriate plate type of heat transfer element (commonly used closed plate type du3e) is selected to ensure that the negative force of flue is within the range required in the agreement, and can reach the guaranteed value of outlet net flue temperature required in the agreement, so as to determine the reasonable type and transmission of flue heat exchanger Height of thermal element.

5. Scope of supply and ordering instructions

5.1. Scope of supply

The scope of supply of main systems and equipment is as follows, and the detailed scope of supply shall be in accordance with the contract.

5.1.1. flue heat exchanger body.

5.1.2. Sealing fan and its pipes, supports and hangers, pipe fittings, valves, etc.

5.1.3. Low leakage sealing fan and its pipes, supports and hangers, pipe fittings, valves, etc.

5.1.4. Soot blower and local control cabinet, etc.

5.1.5. High pressure cleaning water pump and its pipes, supports and hangers, filters, valves, etc.

5.1.6. Maintenance platform of flue heat exchanger (top and bottom bearing maintenance platform of GGH body).

5.1.7. Spare parts and special tools.

5.1.8. Local instrument and control equipment.

5.2. Order requirements

Before ordering, the technical agreement of flue heater shall be signed, including the main technical parameters of GGH, purging steam source and mode, flue composition and characteristic data, project overview, natural conditions (environmental temperature, altitude, earthquake and wind load, etc.), design parameters, operation conditions, technical conditions, performance guarantee, design manufacturing, installation and commissioning requirements, design boundary and supply scope, etc.