CN217237949U

CN217237949U - System for measuring oxygen content in return of top diffused gas of coking tank

Info

Publication number: CN217237949U
Application number: CN202123314979.4U
Authority: CN
Inventors: 刘晓东; 刘思萌; 杨凯; 曹军军; 崔远哲; 袁浚开
Original assignee: Acre Coking and Refractory Engineering Consulting Corp MCC
Current assignee: Acre Coking and Refractory Engineering Consulting Corp MCC
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-08-19
Anticipated expiration: 2031-12-27

Abstract

The utility model provides a coke oven tank top diffusion gas backward flow oxygen content measurement system, including setting up diffusion gas pipeline oxygen content measuring apparatu table AT01 on the diffusion gas back flow. The utility model is characterized in that the device also comprises a nitrogen gas supplementing pipe and a nitrogen gas supplementing pipeline regulating valve AV01 arranged on the nitrogen gas supplementing pipe; the inlet of the nitrogen supplementing pipe is connected with a nitrogen header pipe, and the outlet of the nitrogen supplementing pipe is connected with a pipeline AT the front end of an oxygen content measuring instrument AT01 of the diffused gas pipeline. By adding the nitrogen supplementing pipe and the regulating valve before the diffused gas backflow pipeline enters the gas pipeline, the oxygen content of the tank top diffused gas in a fault state is controlled in a nitrogen supplementing and regulating mode, the problems existing in the traditional scheme can be effectively avoided, the oxygen content of the diffused pipe is timely and accurately judged, the diffused gas backflow oxygen content is controlled within a permitted emission range, and the diffused gas fault online maintenance is possible.

Description

System for measuring oxygen content in return of top diffused gas of coking tank

Technical Field

The utility model relates to a coking gas purification production oxygen content detects technical field, in particular to coking tank deck gas reflux oxygen content measurement system that diffuses.

Background

With the improvement of the national requirement on environmental protection and the increasing maturity of the coal gas purification technology in coking, a plurality of storage tanks are used for storing chemical products in a coal gas purification system in the coking field, and a plurality of chemical product raw materials have volatility with different degrees. In the production process, the storage tank is frequently subjected to charging and discharging operations, pressure fluctuation of a tank top area is generated, if the condition of serious negative pressure is generated, air is sucked into the tank top area, the oxygen content in the diffused air is increased, and if the condition of serious positive pressure is generated, the volatilized diffused air is diffused into the air to cause environmental pollution and harm to production maintenance personnel. At present, the pressure control of a tank top area in a gas purification process adopts automatic control, the pressure is controlled in a micro-negative pressure state, when the pressure of the tank top is insufficient, a control valve replenishes nitrogen, when the pressure is increased, diffused gas is sent to a gas pipeline in front of a gas blower through a return pipeline, the pressure of the gas pipeline is negative pressure, and the pressure is generally about-3.5 KPa. The number of the storage tanks in the gas purification area is large, the storage tanks are dispersed in different process device units, the pressure control of the tank top diffused gas is generally carried out in different areas, the pressure of the tank top in each area is uniformly controlled, and the diffused gas is respectively sent to a front gas pipeline of a gas blower after being gathered. Automatic regulating valves are respectively arranged on the nitrogen pipeline and the diffused gas return pipeline in each area, and the automatic control of the pressure of the top of the storage tank is realized by adopting a split-range control method. The utility model discloses it is exactly to the regional diffused gas backward flow control as the research object in the coal gas purification. A breather valve is generally designed on each storage tank, the pressure in the tank top area exceeds the standard, the breather valve acts to communicate with the atmosphere, and the diffused gas or the sucked air is discharged to ensure that the pressure of the tank top is within the safe range allowed by the process. If the tank body leaks or the breather valve fails to cause negative pressure of the tank body, the phenomenon of air suction is caused, the oxygen content in the diffused gas exceeds the standard, at the moment, if the diffused gas with the oxygen content exceeding the standard is discharged into the coke oven gas, the oxygen content in the coke oven gas exceeds the standard, the strict requirement on the oxygen content in the gas is provided in the deep processing process of the coke oven gas, the probability of safety accidents is increased if the oxygen content exceeds the standard, and meanwhile, the process safety and the product quality of the deep processing of the gas are influenced.

In order to ensure that the oxygen content in the diffused gas does not exceed the standard, the traditional method is to measure the oxygen content of each path of diffused gas return pipe in real time, when the oxygen content is larger than the upper limit, a return pipeline for the diffused gas to the coal gas is automatically cut off, then each storage tank in the area is checked and maintained, and the storage tank is put into operation again after the maintenance is finished. In the process of operation, because the residual diffused gas in the pipeline is not controlled by automatic emptying, some diffused gas with excessive oxygen content is discharged into the gas pipeline, and potential safety hazards exist.

Disclosure of Invention

In order to solve the technical problem that the background art provided, the utility model provides a coke oven tank deck diffusion gas backward flow oxygen content measurement system, through before the diffusion gas backward flow pipeline enters into the gas piping, increase nitrogen gas and supply pipe and governing valve, realize supplementing the nitrogen gas regulation of the oxygen content measurement under the gas fault state that diffuses to the tank deck with the mode that nitrogen gas supplyes the regulation, can effectually avoid the emergence of above-mentioned traditional scheme existence problem, the condition of the oxygen content of pipe is diffused in timely accurate judgement, make diffusion gas backward flow oxygen content control in the within range that the permission was discharged, make diffusion gas trouble online maintenance become probably.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a system for measuring the oxygen content of the return gas of the top of a coking tank comprises a measuring instrument AT01 of the oxygen content of a vent gas pipeline arranged on a vent gas return pipe.

The utility model is characterized in that the device also comprises a nitrogen gas supplementing pipe and a nitrogen gas supplementing pipeline regulating valve AV01 arranged on the nitrogen gas supplementing pipe; the inlet of the nitrogen supplementing pipe is connected with a nitrogen header pipe, and the outlet of the nitrogen supplementing pipe is connected with a pipeline AT the front end of an oxygen content measuring instrument AT01 of the diffused gas pipeline.

Furthermore, a nitrogen manifold pressure measuring instrument PT02 is also arranged on the nitrogen manifold.

Further, the nitrogen supplementing pipeline regulating valve AV01 is also provided with an air supply control solenoid valve ASV01 for interlocking and quickly cutting off the nitrogen supplementing pipeline regulating valve AV 01.

Further, a diffusing pipe pressure measuring instrument PT01, a diffusing pipe regulating valve PV01-2 and a nitrogen pipe regulating valve PV01-1 are arranged on the diffusing gas return pipe, the diffusing pipe pressure measuring instrument PT01 and the diffusing pipe regulating valve PV01-2 are arranged from front to back according to the diffusing gas return direction, the inlet of the nitrogen pipe regulating valve PV01-1 is connected with a nitrogen main pipe, and the outlet of the nitrogen pipe regulating valve PV01-1 is connected to a front-end pipeline of the diffusing pipe pressure measuring instrument PT 01; the outlet of the nitrogen supplementing pipe is positioned at the rear end of the diffusing pipe regulating valve PV 01-2.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a coking tank deck gas backward flow oxygen content measurement system that diffuses, through before diffusing gas backward flow pipeline enters into the gas piping, increase nitrogen gas and supply pipe and governing valve, realize the nitrogen gas replenishment to the oxygen content measurement under the tank deck gas fault state that diffuses with the mode that nitrogen gas replenishment was adjusted, can effectually avoid the emergence of above-mentioned traditional scheme existence problem, the condition of the oxygen content of pipe is diffused in timely accurate judgement, make the gas backward flow oxygen content control of diffusing in the within range that allows the emission, make the online maintenance of gas trouble of diffusing become probably.

Drawings

FIG. 1 is a diagram of a system for measuring the oxygen content of the returned gas of the top of the coking tank.

In the figure: 1-oxygen content measuring instrument of diffused gas pipeline AT 012-air source control solenoid valve ASV 014 of automatic regulating valve AV 013-regulating valve AV01 on the supplemental nitrogen pipeline-diffused pipe regulating valve PV 01-25-air source control solenoid valve PSV 01-26 of regulating valve PV 01-2-diffused pipe pressure measuring instrument PT 017-nitrogen pipe regulating valve PV 01-18-nitrogen header pressure measuring instrument PT 029-diffused gas reflux pipe 10-nitrogen supplement pipe.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1, a system for measuring the oxygen content in the return flow of the coke oven gas vent comprises a vent gas pipeline oxygen content measuring instrument AT01(1) arranged on a vent gas return pipe (9). The nitrogen supplementing pipe (10) and a nitrogen supplementing pipeline regulating valve AV01(2) arranged on the nitrogen supplementing pipe (10) are further included; the inlet of the nitrogen supplementing pipe (10) is connected with a nitrogen header pipe, and the outlet of the nitrogen supplementing pipe is connected with a pipeline AT the front end of the oxygen content measuring instrument AT01(1) of the diffusion gas pipeline. And a nitrogen header pressure measuring instrument PT02(8) is also arranged on the nitrogen header. The nitrogen supplementing pipeline regulating valve AV01(2) is also provided with an air source control electromagnetic valve ASV01(3) for interlocking and quickly cutting off the nitrogen supplementing pipeline regulating valve AV01 (2).

The oxygen content measurement principle of the utility model is that: when the oxygen content of the diffusion gas pipeline is detected to be normal by a diffusion gas pipeline oxygen content measuring instrument AT01(1), the oxygen content of the diffusion reflux system meets the condition of entering a gas system, and a nitrogen supplementing loop is not started; when the oxygen content of the diffused gas is too high (exceeds the upper limit), which indicates that the diffused gas reflux system is abnormal, a nitrogen supplementing loop is started: and opening an air source control electromagnetic valve ASV01(3), putting in a nitrogen supplementing pipeline regulating valve AV01(2), automatically regulating according to the detection value of an oxygen content measuring instrument AT01(1) of the diffused gas pipeline, and increasing the opening along with the increase of the oxygen content detection value so as to regulate the nitrogen supplementing quantity and achieve the purpose of measuring the oxygen content of the diffused gas on the top of the tank in a fault state.

The nitrogen manifold pressure measuring instrument PT02(8) is used for monitoring the pressure of the nitrogen manifold and giving an alarm when the pressure is insufficient.

The utility model discloses there is following setting in addition: a diffusing pipe pressure measuring instrument PT01(6), a diffusing pipe regulating valve PV01-2(4) and a nitrogen pipe regulating valve PV01-1(7) are arranged on the diffusing gas return pipe (9) and at the front end of the outlet of the nitrogen supplementing pipe (10), the diffusing pipe pressure measuring instrument PT01(6) and the diffusing pipe regulating valve PV01-2(4) are arranged from front to back according to the diffusing gas return direction, the inlet of the nitrogen pipe regulating valve PV01-1(7) is connected with a nitrogen main pipe, and the outlet is connected to a front-end pipeline of the diffusing pipe pressure measuring instrument PT01 (6); an air source control solenoid valve PSV-01-2(5) is arranged on the diffusing pipe regulating valve PV01-2(4) and is used for interlocking the diffusing pipe regulating valve PV01-2 (4). The arrangement is used for detecting the pressure of the diffusing pipe by the control system through a diffusing pipe pressure measuring instrument PT01(6), adjusting the nitrogen suction quantity of the diffusing pipe and the diffused gas reflux quantity of the diffused gas pipeline in a split-range mode through the pressure of the diffusing pipe, controlling the valve to supplement nitrogen when the pressure is insufficient, and sending the diffused gas to the gas pipeline in front of the gas blower through the pipeline when the pressure is increased (see background technology).

The utility model discloses an increase nitrogen gas supply pipe (10) and governing valve before diffusing gas back flow (9) enters into the gas piping, realize the nitrogen gas supply to the oxygen content measurement under the tank deck gas fault condition that diffuses with the mode that nitrogen gas supply was adjusted, can effectually avoid the emergence of above-mentioned traditional scheme existing problems, the condition of the oxygen content of pipe is diffused in timely accurate judgement, make the gas that diffuses backward flow oxygen content control in the within range that allows the emission, make the online maintenance of gas trouble of diffusing become probably.

The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.

Claims

1. A system for measuring the oxygen content of the return gas of the top of a coking tank comprises a measuring instrument AT01 of the oxygen content of a gas pipe of the return gas of the vent gas;

the device is characterized by also comprising a nitrogen supplementing pipe and a nitrogen supplementing pipeline regulating valve AV01 arranged on the nitrogen supplementing pipe; the inlet of the nitrogen supplementing pipe is connected with a nitrogen header pipe, and the outlet of the nitrogen supplementing pipe is connected with a pipeline AT the front end of an oxygen content measuring instrument AT01 of the diffused gas pipeline.

2. The system of claim 1, wherein the nitrogen manifold is further provided with a nitrogen manifold pressure gauge PT 02.

3. The system of claim 1 wherein the nitrogen make-up line regulator valve AV01 is further provided with an air supply control solenoid valve ASV01 for interlocking quick disconnect nitrogen make-up line regulator valve AV 01.

4. The system for measuring the returned oxygen content of the coke oven top vent gas according to claim 1, wherein a vent pipe pressure measuring instrument PT01, a vent pipe regulating valve PV01-2 and a nitrogen pipe regulating valve PV01-1 are arranged on the vent gas return pipe, the vent pipe pressure measuring instrument PT01 and the vent pipe regulating valve PV01-2 are arranged from front to back in the vent gas return direction, the inlet of the nitrogen pipe regulating valve PV01-1 is connected with a nitrogen manifold, and the outlet is connected to the front end pipeline of the vent pipe pressure measuring instrument PT 01; the outlet of the nitrogen supplementing pipe is positioned at the rear end of the diffusing pipe regulating valve PV 01-2.