CN-224199334-U - Coke oven gas low-temperature purification system

CN224199334UCN 224199334 UCN224199334 UCN 224199334UCN-224199334-U

Abstract

The utility model discloses a coke oven gas low-temperature purification system which comprises a coke oven, a compressor, a cooling tower, an essential oil remover, an essential naphthalene remover, a filter, a cooling water heat exchanger, a waste water stripping tower and a waste water gas condensate storage tank, wherein a water outlet of the waste water stripping tower is communicated with an inlet of the waste water gas condensate storage tank through a pipeline, an outlet of the waste water gas condensate storage tank is communicated with a water supplementing port at the bottom of the cooling tower through a water supplementing pump, a water outlet at the bottom of the cooling tower is communicated with a heat medium inlet of the cooling water heat exchanger through a circulating pump, and a heat medium outlet of the cooling water heat exchanger is communicated with a spray water inlet of the cooling tower through a pipeline. The method has the advantages that the waste water stripping condensate is used for spraying and cooling the coke oven gas entering the cooling tower, so that the consumption of desalted water is reduced, and the treatment cost of the desalted water is saved. Meanwhile, as the condensate amount of the wastewater stripping process for coking treatment is reduced, the water treatment cost is saved, and the production cost and the operation burden of enterprises are reduced.

Inventors

NIU GUANGSHUO
CUI LIANG
Chai Shiyan
ZHENG SHUNYANG
CUI LE
WU HAIQUAN
ZHAO YUCHENG
HUANG XUANYU
DU JIANQIANG
Xiong Yongzhen
WANG HONGQING
XU HONGCHU
Cai Juanqin
Yan Sanwang

Assignees

内蒙古君正化工有限责任公司

Dates

Publication Date: 20260505
Application Date: 20250430

Claims (6)

1. The coke oven gas low-temperature purification system is characterized by comprising a coke oven, a compressor, a cooling tower, an essential deoiler, a filter, a cooling water heat exchanger, a wastewater stripping tower and a wastewater gas condensate storage tank; The coke oven gas outlet of the coke oven is communicated with the medium pressure cylinder gas inlet of the compressor through a pipeline, the medium pressure cylinder gas outlet of the compressor is communicated with the gas inlet of the cooling tower through a pipeline, the gas outlet of the cooling tower is communicated with the gas inlet of the essential deoiler through a pipeline, the gas outlet of the essential deoiler is communicated with the gas inlet of the filter through a pipeline, the gas outlet of the filter is communicated with the high pressure cylinder gas inlet of the compressor through a pipeline, and the high pressure cylinder gas outlet of the compressor is communicated with the inlet of the coke oven gas temporary storage tank through a pipeline; The water outlet of the waste water stripping tower is communicated with the inlet of the waste water gas condensate storage tank through a pipeline, the outlet of the waste water gas condensate storage tank is communicated with the water supplementing port at the bottom of the cooling tower through a water supplementing pump, the water outlet at the bottom of the cooling tower is communicated with the heat medium inlet of the cooling water heat exchanger through a circulating pump, and the heat medium outlet of the cooling water heat exchanger is communicated with the spray water inlet of the cooling tower through a pipeline.
2. The coke oven gas low-temperature purification system according to claim 1, wherein the bottom liquid outlets of the essential oil remover, the essential naphthalene remover and the filter are all communicated with the inlet of a sewage tank through pipelines, the outlet of the sewage tank is communicated with the heat medium inlet of a sewage heat exchanger through pipelines, and the heat medium outlet of the sewage heat exchanger is communicated with the sewage inlet of a coking and chemical production section through pipelines.
3. The coke oven gas low-temperature purification system according to claim 1, wherein a liquid level sensor is arranged in the cooling tower, a signal output end of the liquid level sensor is in signal connection with a signal input end of a controller, and a signal output end of the controller is in signal connection with a signal input end of the water supplementing pump.
4. A coke oven gas low temperature purification system according to claim 3, wherein the water outlet end of the chilled water supply line is communicated with the chilled medium inlet of the chilled water heat exchanger by a chilled water pump, and the chilled medium outlet of the chilled water heat exchanger is communicated with a chilled water return line; and the signal output end of the controller is also in signal connection with the signal input end of the chilled water pump.
5. The coke oven gas low-temperature purification system according to claim 1, wherein an air inlet of the cooling tower is provided with an air inlet temperature sensor, a spray water flow regulating valve is arranged at a spray water inlet of the cooling tower, a signal output end of the air inlet temperature sensor is in signal connection with a signal input end of a controller, and a signal output end of the controller is in signal connection with a signal input end of the spray water flow regulating valve.
6. The coke oven gas low-temperature purification system according to claim 1, wherein an air inlet of the cooling tower is provided with an air inlet pressure sensor and an air inlet flow regulating valve respectively, an air outlet shutoff valve is arranged at an air outlet of a medium pressure cylinder of the compressor, a signal output end of the air inlet pressure sensor is in signal connection with a signal input end of a controller, and a signal output end of the controller is in signal connection with the air inlet flow regulating valve and the signal input end of the air outlet shutoff valve respectively.

Description

Coke oven gas low-temperature purification system Technical field: The utility model relates to the technical field of coke oven gas treatment, in particular to a low-temperature purifying system for coke oven gas. The background technology is as follows: Coke oven gas mainly originates from coke ovens and is produced when coal is dry distilled at high temperatures of 900-1000 ℃ in the absence of air. The low-position heat value of the coke oven gas reaches about 16-18 MJ/Nm 3, is high-quality gas fuel, and has wide application. However, because the coke oven gas has complex components, the coke oven gas mainly comprises combustible gases such as hydrogen (55-60%), methane (23-27%), carbon monoxide (5-8%), and the like, also contains impurities such as tar, naphthalene, sulfide, ammonia, and the like, has inflammable and explosive characteristics, is easy to explode when mixed with air, and also contains components such as carbon monoxide, hydrogen sulfide, and the like. Thus, untreated coke oven gas cannot be directly utilized. At present, coke oven gas is often treated through a plurality of procedures, specifically, the temperature is reduced and partial impurities are removed through indirect or direct cooling, and then the processes of dry-method and wet-method desulfurization and decyanation, ammonia distillation, acid-washing and deamination, wash oil absorption and debenzolization, cooling crystallization or adsorption and decalin and the like are adopted. However, the existing treatment method has a plurality of problems, such as that the coke oven gas enters a cooling tower through a middle pressure cylinder outlet of a compressor to be sprayed and cooled by desalted water, and impurities in the coke oven gas are washed, so that the cooling tower needs to be supplemented with water after a long time of operation in the process of cooling and purifying the coke oven gas, and the desalted water is used for supplementing water for the cooling tower at present, so that the cooling tower cannot be supplemented with water due to low pressure of the desalted water, and the continuity and the high efficiency of the coke oven gas treatment are seriously affected. The utility model comprises the following steps: In order to solve the problems, an object of the present utility model is to provide a coke oven gas low-temperature purification system. The utility model is implemented by the following technical scheme: A low-temperature purifying system for coke oven gas comprises a coke oven, a compressor, a cooling tower, an essential oil remover, an essential naphthalene remover, a filter, a cooling water heat exchanger, a wastewater stripping tower and a wastewater gas condensate storage tank; The coke oven gas outlet of the coke oven is communicated with the medium pressure cylinder gas inlet of the compressor through a pipeline, the medium pressure cylinder gas outlet of the compressor is communicated with the gas inlet of the cooling tower through a pipeline, the gas outlet of the cooling tower is communicated with the gas inlet of the essential deoiler through a pipeline, the gas outlet of the essential deoiler is communicated with the gas inlet of the filter through a pipeline, the gas outlet of the filter is communicated with the high pressure cylinder gas inlet of the compressor through a pipeline, and the high pressure cylinder gas outlet of the compressor is communicated with the inlet of the coke oven gas temporary storage tank through a pipeline; The water outlet of the waste water stripping tower is communicated with the inlet of the waste water gas condensate storage tank through a pipeline, the outlet of the waste water gas condensate storage tank is communicated with the water supplementing port at the bottom of the cooling tower through a water supplementing pump, the water outlet at the bottom of the cooling tower is communicated with the heat medium inlet of the cooling water heat exchanger through a circulating pump, and the heat medium outlet of the cooling water heat exchanger is communicated with the spray water inlet of the cooling tower through a pipeline. Further, the bottom liquid outlets of the refined deoiling device, the refined naphthalene removing device and the filter are all communicated with the inlet of the sewage tank through pipelines, the outlet of the sewage tank is communicated with the heat medium inlet of the sewage heat exchanger through pipelines, and the heat medium outlet of the sewage heat exchanger is communicated with the sewage inlet of the coking and chemical production section through pipelines. Further, a liquid level sensor is arranged in the cooling tower, a signal output end of the liquid level sensor is in signal connection with a signal input end of a controller, and a signal output end of the controller is in signal connection with a signal input end of the water supplementing pump. Further, the water outlet end of the chilled water inlet pipeline is