Naphthalene washing system of gas primary cooler

Abstract

The utility model relates to the technical field of coke oven gas treatment, in particular to a naphthalene washing system for a gas primary cooler, which is characterized in that the lower end of the primary cooler is connected with a collecting pipe, a tar outlet at the lower end of a gas blower and a tar outlet at the lower end of an electrical tar precipitator are connected with the collecting pipe through pipelines, and the collecting pipe is connected with a mixing box; the discharging end of the ammonia water tank is connected with the mixing box through a pipeline, and the mixing box is connected with the upper-section spray pipe and the lower-section spray pipe through a feeding pipe. According to the utility model, the tar outlets at the lower ends of the gas blower and the electrical tar precipitator are connected with the collecting pipe, and the collecting pipe is connected with the mixing box, so that light tar generated by the gas blower and the electrical tar precipitator can be collected; therefore, the content of light tar in the condensate of the primary cooler is increased, and the naphthalene removal efficiency is improved while resources are recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven gas treatment, in particular to a naphthalene washing system for a gas primary cooler. Background Technique

[0002] China is the country with the largest coke production in the world, and the amount of coke oven gas produced is huge. How to utilize it efficiently and reasonably is a major issue related to environmental protection, comprehensive utilization of resources, energy conservation and emission reduction. Coke oven gas, also known as coke oven gas, belongs to high-calorific value gas due to its high combustible components. Raw gas or crude gas refers to a combustible gas produced by mixing several bituminous coals into coking coal and subjecting it to high-temperature dry distillation in a coke oven, while producing coke and tar products. It is a by-product of the coking industry. Gas condensation technology refers to the process of cooling and condensing substances such as water vapor and oil vapor in gas into liquid during gas production. The primary cooler is a key device used to cool fluids in coal coking plants or refineries. In the field of coal coking, the primary cooler is mainly used to cool high-temperature gas to a lower temperature and remove impurities such as water vapor, tar, and naphthalene in the gas during this process. After the gas passes through the primary cooler, it still needs to be processed by a blower and an electrostatic tar precipitator. Currently, the light tar generated by the blower and the electrostatic tar precipitator is not fully utilized. The light tar formed by the blower and the electrostatic tar precipitator can be used for naphthalene washing in the primary cooler, which can improve the naphthalene washing efficiency while realizing resource recycling. Therefore, it is necessary to develop a naphthalene washing system for a gas primary cooler that can fully utilize the light tar generated by the blower and the electrostatic tar precipitator during gas treatment and improve the naphthalene washing efficiency of the primary cooler. Content of the Utility Model

[0003] In view of the above technical problems, the utility model provides a naphthalene washing system for a gas primary cooler that can fully utilize the light tar generated by the blower and the electrostatic tar precipitator during gas treatment and improve the naphthalene washing efficiency of the primary cooler, so as to solve the problem that the light tar generated by the blower and the electrostatic tar precipitator in the existing gas treatment system is not fully utilized.

[0004] To solve the above technical problems, a naphthalene washing system for a gas primary cooler according to the utility model includes a primary cooler, a gas blower, and an electrostatic tar precipitator. A gas inlet is connected to the upper end of the primary cooler, and a gas outlet is connected to the lower end of the primary cooler. An upper spray pipe, an upper circulation pipe, a lower spray pipe, and a lower circulation pipe are arranged in the primary cooler from top to bottom. The gas outlet is connected to the inlet end of the gas blower through a pipeline, the outlet end of the gas blower is connected to the inlet end of the electrostatic tar precipitator through a pipeline, a collection pipe is connected to the lower end of the primary cooler, the tar outlets at the lower ends of the gas blower and the electrostatic tar precipitator are both connected to the collection pipe through pipelines, the collection pipe is connected to a mixing tank, and an ammonia water tank is further included. The discharging end of the ammonia water tank is connected to the mixing tank through a pipeline, and the mixing tank is connected to the upper spray pipe and the lower spray pipe through a feeding pipe.

[0005] Further, the upper spray pipe and the lower spray pipe are rotatably arranged in the primary cooler. One end of each of the upper spray pipe and the lower spray pipe penetrates through the primary cooler and is fixedly connected to a rotary joint, and the other end of the rotary joint is connected to the feed pipe. The upper spray pipe is driven by a first motor, and the lower spray pipe is driven by a second motor.

[0006] Further, a plurality of branch pipes are connected to both the upper spray pipe and the lower spray pipe, and through holes are formed in the branch pipes.

[0007] Further, driving wheels are fixedly connected to the output shafts of the first motor and the second motor, driven wheels are fixedly connected to both the upper spray pipe and the lower spray pipe, and the driving wheels are connected to the corresponding driven wheels through belt drives.

[0008] Further, a stirring paddle is rotatably connected in the mixing tank, and the stirring paddle is driven by a stirring motor.

[0009] Further, a booster pump is connected to the feed pipe.

[0010] Further, a flow control valve is connected to the pipeline at the discharge end of the ammonia water tank.

[0011] The utility model has the following advantages compared with the prior art:

[0012] By connecting the tar outlet at the lower end of the gas blower and the electro-tar precipitator to the collecting pipe and connecting the collecting pipe to the mixing tank, the utility model can collect the light tar generated by the gas blower and the electro-tar precipitator. By arranging an ammonia water tank connected to the mixing tank, it is convenient to mix ammonia water and tar. By connecting the mixing tank to the upper spray pipe and the lower spray pipe through the feed pipe, the mixed liquid of the recovered light tar and ammonia water can be fully utilized for naphthalene removal in the primary cooler. This device collects the light tar generated by the gas blower and the electro-tar precipitator, thereby increasing the content of light tar in the condensate of the primary cooler. While realizing resource recovery and utilization, the efficiency of naphthalene removal is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model.

[0014] Figure 2 is a structural diagram of the primary cooler of the utility model.

[0015] In the figure: 1. Primary cooler, 101. Upper spray pipe, 102. Upper circulation pipe, 103. Lower spray pipe, 104. Lower circulation pipe, 105. First motor, 106. Second motor, 107 Rotary joint, 2. Gas blower, 3. Electro-tar precipitator, 4. Mixing tank, 5. Ammonia water tank, 6. Feed pipe, 7. Booster pump. Detailed implementation mode

[0016] The present utility model will be further described below in conjunction with the accompanying drawings.

[0017] As Figure 1 、 2 shown, a naphthalene washing system for a primary gas cooler includes a primary gas cooler 1, a gas blower 2, and an electrostatic tar precipitator 3. The upper end of the primary gas cooler 1 is connected with a gas inlet, and the lower end is connected with a gas outlet. Inside the primary gas cooler 1, there are an upper spray pipe 101, an upper circulation pipe 102, a lower spray pipe 103, and a lower circulation pipe 104 arranged from top to bottom. The gas outlet is connected to the inlet end of the gas blower 2 through a pipeline, and the outlet end of the gas blower 2 is connected to the inlet end of the electrostatic tar precipitator 3 through a pipeline. The lower end of the primary gas cooler 1 is connected with a collecting pipe, and the tar outlets at the lower ends of the gas blower 2 and the electrostatic tar precipitator 3 are both connected to the collecting pipe through pipelines. The collecting pipe is connected to a mixing tank 4 through a pipeline. The system further includes an ammonia water tank 5, and the discharging end of the ammonia water tank 5 is connected to the mixing tank 4 through a pipeline. A water pump is connected to the pipeline at the discharging end of the ammonia water tank 5. The output end of the mixing tank 4 is connected to the upper spray pipe 101 and the lower spray pipe 103 through a feeding pipe 6.

[0018] It should be noted that in this embodiment, the input ends and output ends of the upper circulation pipe 102 and the lower circulation pipe 104 penetrate through the primary gas cooler 1 and are communicated with the cooling medium.

[0019] In order to enable the mixing liquid and the gas to fully contact and ensure a good naphthalene removal effect, the upper spray pipe 101 and the lower spray pipe 103 are movably arranged in the primary gas cooler 1 through sealed bearings. One end of each of the upper spray pipe 101 and the lower spray pipe 103 penetrates through the primary gas cooler 1 and is fixedly connected with a rotary joint 107. The other end of the rotary joint 107 is connected to the feeding pipe 6 through a pipeline. The upper spray pipe 101 is driven by a first motor 105, and the lower spray pipe 103 is driven by a second motor 106.

[0020] In order to further improve the spraying uniformity of the mixing liquid, a number of branch pipes are connected to the upper spray pipe 101 and the lower spray pipe 103, and through holes are opened on the branch pipes.

[0021] In order to drive the upper spray pipe 101 and the lower spray pipe 103 to rotate stably, the output shafts of the first motor 105 and the second motor 106 are both fixedly connected with driving wheels, and the upper spray pipe 101 and the lower spray pipe 103 are both fixedly connected with driven wheels. The driving wheel and the corresponding driven wheel are connected by belt drive. It should be noted that between the first motor 105 and the upper spray pipe 101, and between the second motor 106 and the lower spray pipe 103, stable transmission can also be achieved through the way of sprocket and chain drive, gear meshing drive, and bevel gear meshing.

[0022] In order to ensure the uniform mixing of light tar and ammonia water, a stirring paddle is rotatably connected inside the mixing tank 4. The stirring paddle includes a stirring shaft, and a plurality of stirring blades are fixedly connected to the stirring shaft. One end of the stirring shaft penetrates through the mixing tank 4 and is fixedly connected to the output shaft of the stirring motor. The stirring motor is fixedly connected to the outside of the mixing tank 4 through a motor base.

[0023] In order to enable the mixed liquid to be sprayed evenly and improve the effect of naphthalene removal by spraying, a booster pump 7 is connected to the feed pipe 6.

[0024] In order to facilitate the control of the amount of ammonia water entering the mixing tank 4, a flow control valve is connected to the pipeline at the discharge end of the ammonia water tank 5.

[0025] It should be noted that in this embodiment, the gas blower 2 and the electrostatic tar precipitator 3 are both existing devices, which are relatively common equipment in the coke oven gas treatment system. Therefore, their specific structures will not be described in too much detail.

[0026] The working process of this embodiment is as follows:

[0027] When treating coke oven gas, the coke oven gas enters the primary cooler 1 from the gas inlet. The cooling medium in the upper section circulation pipe 102 and the lower section circulation pipe 104 is connected. The gas is cooled in the primary cooler 1 to form condensate, which accumulates at the bottom of the primary cooler 1 and enters the mixing tank 4 from the collection pipe. The gas enters the gas blower 2 from the gas outlet, and then enters the electrostatic tar precipitator 3 from the gas blower 2. The light tar formed after passing through the gas blower 2 and the electrostatic tar precipitator 3 converges from the tar outlet at the lower end to the collection pipe and enters the mixing tank 4. The flow control valve and the water pump at the discharge end of the ammonia water tank 5 are started to introduce ammonia water into the mixing tank 4. Then, the stirring motor is started to drive the stirring paddle to rotate, so that the liquid in the mixing tank is mixed evenly. The booster pump 7 is started to pump the mixed liquid to the feed pipe 6 and enter the upper section spray pipe 101 and the lower section spray pipe 103. The first motor 105 and the second motor 106 are started to run synchronously. The first motor 105 and the second motor 106 drive the upper section spray pipe 101 and the lower section spray pipe 103 to rotate, so that the mixed liquid entering the primary cooler 1 is in full contact with the gas, improving the naphthalene removal efficiency.

Claims

1. A naphthalene washing system with a gas primary cooler, comprising a primary cooler (1), a gas blower (2), and an electric tar collector (3), wherein the primary cooler (1) is connected to a gas inlet at the upper end and to a gas outlet at the lower end, wherein an upper nozzle (101), an upper circulation pipe (102), a lower nozzle (103), and a lower circulation pipe (104) are arranged from top to bottom in the primary cooler (1), wherein the gas outlet is connected to the inlet end of the gas blower (2) through a pipeline, and the outlet end of the gas blower (2) is connected to the inlet end of the electric tar collector (3) through a pipeline, wherein: The lower section of the primary cooler (1) is connected to a collecting pipe, the tar outlet at the lower end of the gas blower (2) and the tar outlet at the lower end of the electric tar collector (3) are both connected to the collecting pipe through pipelines, the collecting pipe is connected to a mixing box (4), and also includes an ammonia tank (5), the discharge end of the ammonia tank (5) is connected to the mixing box (4) through a pipeline, and the mixing box (4) is connected to the upper nozzle (101) and the lower nozzle (103) through a feeding pipe (6).

2. The naphthalene washing system for the coal gas primary cooler according to claim 1, characterized in that: The upper nozzle (101) and the lower nozzle (103) are rotatably arranged in the primary cooler (1); one end of each of the upper nozzle (101) and the lower nozzle (103) passes through the primary cooler (1) and is fixedly connected to a rotary joint (107); the other end of the rotary joint (107) is connected to the feed pipe (6); the upper nozzle (101) is driven by a first motor (105), and the lower nozzle (103) is driven by a second motor (106).

3. The naphthalene washing system of the coal gas primary cooler according to claim 2, characterized in that: The upper nozzle (101) and the lower nozzle (103) are both connected to a plurality of branch pipes, and the branch pipes are provided with through holes.

4. The naphthalene washing system for the coal gas primary cooler according to claim 2, characterized in that: The output shafts of the first motor (105) and the second motor (106) are both fixedly connected to driving wheels, and the upper nozzle (101) and the lower nozzle (103) are both fixedly connected to driven wheels, and the driving wheels are connected to the corresponding driven wheels through belt transmission.

5. The naphthalene washing system for coal gas primary cooler according to claim 1, characterized in that: A stirring paddle is rotatably connected inside the mixing box (4), and the stirring paddle is driven by a stirring motor.

6. The naphthalene washing system of the coal gas primary cooler according to claim 1, characterized in that: The feeding pipe (6) is connected to a booster pump (7).

7. The naphthalene washing system of the coal gas primary cooler according to claim 1, characterized in that: A flow control valve is connected to the pipeline at the discharge end of the ammonia water tank (5).

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