A method for washing naphthalene online in inter-stage heat exchanger of gas compressor

Abstract

The invention relates to an online naphthalene washing method for an inter-stage heat exchanger of a coal gas compressor, belonging to the technical field of heat exchanger cleaning, and comprising a coking emulsion tank, an inter-stage heat exchanger, an inter-stage separator and a ground trough. The coking emulsion tank is connected to a coal gas inlet pipe through a delivery pump, the coal gas inlet pipe is connected to the air inlet side of the inter-stage heat exchanger, the air outlet side of the inter-stage heat exchanger is connected to the inter-stage separator, the bottom of the inter-stage separator is connected to the ground trough through a drain pipe, and a control valve is installed on the drain pipe. The invention is convenient for quickly cleaning the heat exchanger and has high cleaning efficiency.

Description

Technical Field

[0001] The invention relates to an online naphthalene washing method for an inter-stage heat exchanger of a coal gas compressor, belonging to the technical field of heat exchanger cleaning. Background Art

[0002] The gas compressor is a key equipment in the methanol production unit. Its stable operation directly affects the production level of the methanol unit. Since the gas from the coking unit inevitably contains a small amount of impurities such as tar and naphthalene, after the gas compressor has been running for a period of time, the tubes of the inter-stage heat exchanger will be blocked, causing increased resistance and being forced to shut down for cleaning, which usually takes three months and less than a month in severe cases, seriously affecting production efficiency. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides an online naphthalene washing method for an inter-stage heat exchanger of a gas compressor, which is convenient for quickly cleaning the heat exchanger and has high cleaning efficiency.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is an online naphthalene washing method for an inter-stage heat exchanger of a coal gas compressor, comprising a coking emulsion tank, an inter-stage heat exchanger, an inter-stage separator and a ground trough, wherein the coking emulsion tank is connected to a coal gas inlet pipe through a delivery pump, the coal gas inlet pipe is connected to the air inlet side of the inter-stage heat exchanger, the air outlet side of the inter-stage heat exchanger is connected to the inter-stage separator, the bottom of the inter-stage separator is connected to the ground trough through a drain pipe, and a control valve is installed on the drain pipe.

[0005] The emulsion in the coking emulsion tank is transported to the gas inlet pipe through a delivery pump, mixed with the coal gas in the gas inlet pipe and then enters the inter-stage heat exchanger, and after heat exchange in the inter-stage heat exchanger, enters the inter-stage separator, and the separated coal gas is transported to the lower section of the gas delivery compressor through the inter-stage separator, and the separated emulsion enters the ground trough, and then transported to the coking mechanized clarification tank.

[0006] Preferably, the delivery pump is connected to the gas inlet pipe through an emulsion pipe, and an emulsion nozzle is provided in the gas inlet pipe, and the emulsion pipe is connected to the emulsion nozzle.

[0007] Preferably, the spraying direction of the emulsion nozzle is opposite to the running direction of the coal gas.

[0008] Preferably, the distance between the emulsion nozzle and the air inlet of the inter-stage heat exchanger is 1 m.

[0009] Preferably, the pressure of the emulsion is 0.5MPa-0.75MPa greater than the gas pressure.

[0010] Compared with the prior art, the present invention has the following technical effects: the present invention has a simple process and is easy to operate. The emulsion in the coking emulsion tank is directly used to spray the emulsion into the gas pipeline, and then enters the heat exchanger to clean a small amount of impurities such as tar and naphthalene in the heat exchanger. After cleaning, the emulsion enters the separator for separation, and the emulsion is returned to the ground trough and then transported to the coking mechanized clarification tank for circulation. The cleaning is simple and can be cleaned online in real time with low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0012] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0013] like Figure 1 As shown, a method for washing naphthalene online in an inter-stage heat exchanger of a coal gas compressor comprises a coking emulsion tank 1, an inter-stage heat exchanger 4, an inter-stage separator 5 and a ground trough 8. The coking emulsion tank 1 is connected to a coal gas inlet pipe through a delivery pump 3. The coal gas inlet pipe is connected to the air inlet side of the inter-stage heat exchanger 4. The air outlet side of the inter-stage heat exchanger 4 is connected to the inter-stage separator 5. The bottom of the inter-stage separator 5 is connected to the ground trough 8 through a drain pipe 7. A control valve 6 is installed on the drain pipe 8. The emulsion in the coking emulsion tank 1 is delivered to the coal gas inlet pipe through a delivery pump, mixed with the coal gas in the coal gas inlet pipe, and then enters the inter-stage heat exchanger. After heat exchange in the inter-stage heat exchanger, it enters the inter-stage separator. The separated coal gas is delivered to the lower section of the coal gas delivery compressor through the inter-stage separator. The separated emulsion enters the ground trough and then is delivered to the coking mechanized clarification tank.

[0014] Among them, the delivery pump 3 is connected to the gas inlet pipe through the emulsion pipe 2, and an emulsion nozzle is arranged in the gas inlet pipe. The emulsion pipe is connected to the emulsion nozzle. The spray direction of the emulsion nozzle is opposite to the running direction of the gas, ensuring that the emulsion can be evenly dispersed in the gas. The distance between the emulsion nozzle and the air inlet of the inter-stage heat exchanger is 1m, ensuring that the emulsion can enter the heat exchanger in the form of water mist to avoid deposition in the pipeline and affect the cleaning effect. The pressure of the emulsion is 0.5MPa-0.75Mpa greater than the gas pressure. The amount of emulsion sprayed in shall not be too large or too small. Too large will affect the operation of the compressor, and too small will not have a cleaning effect. Therefore, the emulsion tank is equipped with a liquid level gauge for observation during cleaning. At the same time, during cleaning, pay attention to the liquid level of the inter-stage separator and the ground trough to prevent gas blockage. The cleaning liquid is returned to the coking mechanization clarification tank through the ground trough.

[0015] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A method for washing naphthalene online in a gas compressor interstage heat exchanger. Features: It includes a coking emulsion tank, an inter-stage heat exchanger, an inter-stage separator and a ground trough. The coking emulsion tank is connected to a gas inlet pipe through a delivery pump. The gas inlet pipe is connected to the inlet side of the inter-stage heat exchanger. The outlet side of the inter-stage heat exchanger is connected to the inter-stage separator. The bottom of the inter-stage separator is connected to the ground trough through a drain pipe. A control valve is installed on the drain pipe. The emulsion in the coking emulsion tank is transported to the gas inlet pipe by a delivery pump, mixed with the gas in the gas inlet pipe and then enters the inter-stage heat exchanger, and then enters the inter-stage separator after heat exchange in the inter-stage heat exchanger. The separated gas is transported to the lower section of the gas delivery compressor through the inter-stage separator, and the separated emulsion enters the ground trough, and then transported to the coking mechanized clarification tank; The delivery pump is connected to the gas inlet pipe through an emulsion pipe, and an emulsion nozzle is provided in the gas inlet pipe, and the emulsion pipe is connected to the emulsion nozzle; The spraying direction of the emulsion nozzle is opposite to the running direction of the coal gas.

2. The method for washing naphthalene online in a gas compressor interstage heat exchanger according to claim 1, Features: The distance between the emulsion nozzle and the air inlet of the inter-stage heat exchanger is 1m.

3. A method for washing naphthalene online in a gas compressor interstage heat exchanger according to claim 1 or 2, Features: The pressure of the emulsion is 0.5MPa-0.75MPa greater than the gas pressure.

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