Coal gas waste heat recovery device

Abstract

The utility model discloses a coal gas waste heat recovery device, which comprises a shell as well as a tubular evaporator, a superheater and a low-temperature evaporator which are arranged in the shell and are sequentially arranged along the flowing direction of coal gas, and is characterized in that the low-temperature evaporator comprises a low-temperature evaporator barrel and a low-temperature evaporator heat pipe; the low-temperature evaporator heat pipe is arranged on the low-temperature evaporator cylinder in a downward inclined mode, and low-temperature evaporator fins are arranged on the portion, located outside the low-temperature evaporator cylinder, of the low-temperature evaporator heat pipe. The number of the low-temperature evaporator fins located on the upper portion of the low-temperature evaporator barrel or all the low-temperature evaporator fins is 1-3 in the circumferential direction of the low-temperature evaporator heat pipe, and one low-temperature evaporator fin is vertically arranged on the air facing side of the low-temperature evaporator heat pipe. The heat exchanger has the advantages that dust can be prevented from blocking the heat exchanger by designing the structure of the fins in the superheater and the low-temperature evaporator, heat pipe explosion and damage caused by high temperature of inlet gas can be prevented, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery equipment, and in particular relates to a coal gas waste heat recovery device. Background Art

[0002] The waste heat recovery of coal gas generally includes a high-temperature evaporation section, a superheating section, and a low-temperature evaporation section. The high-temperature evaporation section is generally equipped with a shell-and-tube or heat pipe heat exchanger, while the superheating section and the low-temperature evaporation section use a heat pipe heat exchanger. The fins in the heat pipe heat exchanger are wrapped around the heat pipe. The disadvantages of this structure are: it is easy to accumulate dust and cause blockage, which gradually reduces the heat exchange area and increases the resistance of the equipment; because the temperature of pure oxygen-oxidized coal gas is high, it is easy to cause the heat pipe at the inlet of the device to burst, which reduces the heat exchange area of ​​the device and reduces the energy recovery efficiency of the device. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a coal gas waste heat recovery device. By designing the structure of the fins in the superheater and the low-temperature evaporator and the installation method of the heat pipe, the heat exchanger can be prevented from being blocked by dust, and the heat pipe can be prevented from being damaged by bursting due to the high temperature of the inlet gas, thereby extending the service life of the equipment.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a coal gas waste heat recovery device, including a shell and a shell and tube evaporator, a superheater and a low-temperature evaporator arranged in the shell and arranged in sequence along the flow direction of the coal gas, a coal gas inlet and a coal gas outlet are respectively provided at the top and bottom of the shell, and the key lies in: the low-temperature evaporator includes a low-temperature evaporator cylinder, a desalted water inlet pipe and a gas-liquid mixture discharge pipe communicated with the low-temperature evaporator cylinder, and a low-temperature evaporator heat pipe with two ends respectively located inside and outside the low-temperature evaporator cylinder, the low-temperature evaporator heat pipe is arranged on the low-temperature evaporator cylinder at a downward inclination and a low-temperature evaporator fin is provided on the part located outside the low-temperature evaporator cylinder, the low-temperature evaporator fin located on the upper part of the low-temperature evaporator cylinder or all the low-temperature evaporator fins are evenly arranged 1-3 along the circumference of the low-temperature evaporator heat pipe, and one of the low-temperature evaporator fins is vertically arranged on the air-incoming side of the low-temperature evaporator heat pipe.

[0005] Furthermore, the low-temperature evaporator heat pipes are arranged in multiple rows along the circumferential spiral of the low-temperature evaporator cylinder.

[0006] Furthermore, the superheater includes a superheater cylinder, a steam inlet pipe and a steam exhaust pipe communicated with the superheater cylinder, and a superheater heat pipe with two ends respectively located inside and outside the superheater cylinder, the superheater heat pipe is arranged on the superheater cylinder at a downward inclination and a superheater fin is provided on the portion located outside the superheater cylinder, 1-3 superheater fins are evenly arranged along the circumference of the superheater heat pipe and one of the superheater fins is vertically arranged on the air-incoming side of the superheater heat pipe.

[0007] Furthermore, the superheater heat pipes are arranged in multiple rows along the circumferential spiral of the superheater cylinder.

[0008] Furthermore, a refractory layer is provided on the inner wall of the shell and on the top and outer side of the shell-and-tube evaporator.

[0009] Furthermore, the shell-and-tube evaporator is provided with 1-2 groups along the axial direction of the shell.

[0010] Furthermore, an anti-scouring protective tile is provided on the air-incoming side of the top steam collecting pipe of the shell-and-tube evaporator.

[0011] Furthermore, the anti-scour protective tile is made of stainless steel.

[0012] Furthermore, the low-temperature evaporator heat pipe is inclined downward at an angle of 25°-35°.

[0013] Furthermore, an ash discharge port is provided below the gas outlet.

[0014] The beneficial effects of the utility model are: 1. By designing the structural installation method of the fins in the superheater and the low-temperature evaporator, dust can be prevented from clogging the heat exchanger, and the heat pipe bursting damage caused by the high temperature of the inlet gas can be prevented, thereby extending the service life of the equipment; 2. By optimizing the internal structure of the waste heat recovery device, the waste heat recovery is more reasonable and the waste heat recovery efficiency is higher.

[0015] The utility model is described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model coal gas waste heat recovery device;

[0017] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0018] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle.

[0019] In the accompanying drawings, 1, shell, 1-1, gas inlet, 1-2, gas outlet, 1-3, ash discharge port, 1-4, manhole, 2, shell and tube evaporator, 3, superheater, 3-1, superheater cylinder, 3-2, steam inlet pipe, 3-3, steam discharge pipe, 3-4, superheater heat pipe, 3-5, superheater fin, 4, low-temperature evaporator, 4-1, low-temperature evaporator cylinder, 4-2, desalted water inlet pipe, 4-3, gas-liquid mixture discharge pipe, 4-4, low-temperature evaporator heat pipe, 4-5, low-temperature evaporator fin, 5, anti-scour protective tile, 6, refractory layer. DETAILED DESCRIPTION

[0020] See attached Figure 1-3 The utility model provides a gas waste heat recovery device, comprising a shell 1 and a tube-in-tube evaporator 2, a superheater 3 and a low-temperature evaporator 4 which are arranged in the shell 1 and sequentially arranged along the gas flow direction.

[0021] A gas inlet 1-1 and a gas outlet 1-2 are provided at the top and bottom of the shell 1, respectively. After passing through the dust collector, the gas enters the shell 1 through the gas inlet 1-1, flows downward in sequence through the tube-and-tube evaporator 2, the superheater 3 and the low-temperature evaporator 4, and is discharged through the gas outlet 1-2. An ash discharge port 1-3 is provided below the gas outlet 1-2. A manhole 1-4 for maintenance is also provided on the shell 1.

[0022] A refractory layer 6 is provided on the inner wall of the shell 1 and on the top and outer side of the tube-in-tube evaporator 2 to achieve the purpose of heat insulation and erosion resistance.

[0023] See attached Figure 1 According to the size of the shell 1 in the height direction, the shell-and-tube evaporator 2 is provided with one or two groups along the axial direction of the shell 1. In this embodiment, two groups are provided. An anti-scouring protective tile 5 is provided on the gas-incoming side of the steam collecting pipe of the shell-and-tube evaporator 2 located at the top. The free end of the protective tile is located on the gas-incoming side of the steam collecting pipe in the shell-and-tube evaporator 2 and is preferably made of stainless steel.

[0024] See attached Figure 1 and 2 The superheater 3 adopts a heat pipe evaporator, including a superheater barrel 3-1, a steam inlet pipe 3-2 and a steam exhaust pipe 3-3 communicated with the superheater barrel 3-1, and a superheater heat pipe 3-4 whose two ends are respectively located inside and outside the superheater barrel 3-1. The superheater heat pipe 3-4 is arranged on the superheater barrel 3-1 at an angle downward, and a superheater fin 3-5 is provided on the part located outside the superheater barrel 3-1. 1-3 superheater fins 3-5 are evenly arranged along the circumference of the superheater heat pipe 3-4, and one superheater fin 3-5 is vertically arranged on the air-incoming side of the superheater heat pipe 3-4.

[0025] The superheater heat pipes 3-4 are arranged in multiple rows along the circumferential spiral of the superheater barrel 3-1. The superheater fins 3-5 are inclined downward at an angle of 25°-32°. In this embodiment, 2 or 3 superheater fins 3-5 are provided.

[0026] See attached Figure 1 and 3 The low-temperature evaporator 4 adopts a heat pipe evaporator, including a low-temperature evaporator barrel 4-1, a desalted water inlet pipe 4-2 and a gas-liquid mixture discharge pipe 4-3 connected to the low-temperature evaporator barrel 4-1, and a low-temperature evaporator heat pipe 4-4 whose two ends are respectively located inside and outside the low-temperature evaporator barrel 4-1. The low-temperature evaporator heat pipe 4-4 is arranged on the low-temperature evaporator barrel 4-1 at an angle downward, and a low-temperature evaporator fin 4-5 is arranged on the part located outside the low-temperature evaporator barrel 4-1. The low-temperature evaporator fin 4-5 located on the upper part of the low-temperature evaporator barrel 4-1 or all the low-temperature evaporator fins 4-5 on the low-temperature evaporator barrel 4-1 are evenly arranged 1-3 along the circumference of the low-temperature evaporator heat pipe 4-4, and one of the low-temperature evaporator fins 4-5 is vertically arranged on the gas-incoming side of the low-temperature evaporator heat pipe 4-4. Such a design can effectively prevent dust from clogging the fins of the heat exchanger, resulting in high inlet gas temperature and heat pipe burst damage, thereby extending the service life of the equipment. In this embodiment, 2 or 3 low-temperature evaporator fins 4-5 are provided. To prevent dust accumulation, the bottom 3-5 layers of heat pipes may not be welded with fins, and are bare pipe type.

[0027] The low-temperature evaporator heat pipe 4-4 is arranged in multiple rows along the circumferential spiral of the low-temperature evaporator cylinder 4-1 to extend the time for the gas to pass through the low-temperature evaporator 4 and ensure the heat exchange effect. The low-temperature evaporator heat pipe 4-4 is tilted downward at an angle of 27°-35° and is greater than the tilted downward angle of the superheater fin 3-5, which facilitates the energy transfer of the medium in the heat pipe during evaporation and condensation.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A gas waste heat recovery device, comprising a shell (1) and a tube-and-tube evaporator (2), a superheater (3) and a low-temperature evaporator (4) arranged in the shell (1) and arranged in sequence along the gas flow direction, wherein a gas inlet (1-1) and a gas outlet (1-2) are respectively arranged at the top and the bottom of the shell (1), and characterized in that: The low-temperature evaporator (4) comprises a low-temperature evaporator barrel (4-1), a desalted water inlet pipe (4-2) and a gas-liquid mixture discharge pipe (4-3) communicated with the low-temperature evaporator barrel (4-1), and a low-temperature evaporator heat pipe (4-4) with two ends respectively located inside and outside the low-temperature evaporator barrel (4-1); the low-temperature evaporator heat pipe (4-4) is arranged on the low-temperature evaporator barrel (4-1) in a downwardly inclined manner and a low-temperature evaporator fin (4-5) is provided on the portion located outside the low-temperature evaporator barrel (4-1); 1 to 3 low-temperature evaporator fins (4-5) located on the upper portion of the low-temperature evaporator barrel (4-1) or all of the low-temperature evaporator fins (4-5) are evenly arranged along the circumference of the low-temperature evaporator heat pipe (4-4), and one of the low-temperature evaporator fins (4-5) is vertically arranged on the air-incoming side of the low-temperature evaporator heat pipe (4-4).

2. The gas waste heat recovery device according to claim 1, characterized in that: The low-temperature evaporator heat pipes (4-4) are arranged in multiple rows along the circumferential spiral of the low-temperature evaporator cylinder (4-1).

3. The gas waste heat recovery device according to claim 1, characterized in that: The superheater (3) comprises a superheater barrel (3-1), a steam inlet pipe (3-2) and a steam outlet pipe (3-3) communicated with the superheater barrel (3-1), and a superheater heat pipe (3-4) with two ends respectively located inside and outside the superheater barrel (3-1); the superheater heat pipe (3-4) is arranged on the superheater barrel (3-1) in a downwardly inclined manner and a superheater fin (3-5) is provided on the portion located outside the superheater barrel (3-1); 1 to 3 superheater fins (3-5) are evenly arranged along the circumference of the superheater heat pipe (3-4), and one of the superheater fins (3-5) is vertically arranged on the air-incoming side of the superheater heat pipe (3-4).

4. The gas waste heat recovery device according to claim 3, characterized in that: The superheater heat pipes (3-4) are arranged in multiple rows along the circumferential spiral of the superheater cylinder (3-1).

5. The gas waste heat recovery device according to claim 1, characterized in that: A refractory layer (6) is provided on the inner wall of the shell (1) and located on the top and the outer side of the shell-and-tube evaporator (2).

6. The gas waste heat recovery device according to claim 1, characterized in that: The shell-and-tube evaporator (2) is provided in 1-2 groups along the axial direction of the shell (1).

7. The gas waste heat recovery device according to claim 1, characterized in that: An anti-scouring protective tile (5) is provided on the air-incoming side of the top steam collecting pipe of the shell-and-tube evaporator (2).

8. The gas waste heat recovery device according to claim 7, characterized in that: The anti-scour protective tile (5) is made of stainless steel.

9. The gas waste heat recovery device according to claim 1, characterized in that: The low-temperature evaporator heat pipe (4-4) is inclined downward at an angle of 25°-35°.

10. The coal gas waste heat recovery device according to any one of claims 1 to 9, characterized in that: An ash discharge port (1-3) is provided below the gas outlet (1-2).

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