阅读说明：本技术 一种初冷器水循环系统及其控制方法 (Primary cooler water circulation system and control method thereof ) 是由 付志超 王延斌 刘海峰 张献文 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种初冷器水循环系统及其控制方法,属于初冷器技术领域；包括初冷器、上段水循环装置、下段水循环装置、地下补水装置、联通阀和初冷器控制站DCS；控制方法包括以下步骤：获取初冷器出口的煤气温度T；煤气温度T>25℃时,开启地下补水装置；煤气温度30℃<T<35℃时,调节煤气进、出气阀开度至1/2；煤气温度T>35℃时,调节煤气进、出气阀开度至1/4；煤气温度T<25℃时,判定上段循环水池水质条件,不达标则启动上段循环水池净化程序；煤气温度T<25℃时,判定下段循环水池水质条件,不达标则启动下段循环水池净化程序。本发明能够提高煤气的冷却效率、实现初冷器水循环系统排污与补水的自动控制。(The invention discloses a primary cooler water circulation system and a control method thereof, belonging to the technical field of primary coolers; the system comprises a primary cooler, an upper section water circulation device, a lower section water circulation device, an underground water replenishing device, a communicating valve and a primary cooler control station DCS; the control method comprises the following steps: acquiring the temperature T of the coal gas at the outlet of the primary cooler; when the temperature T of the coal gas is higher than 25 ℃, an underground water replenishing device is started; when the temperature of the coal gas is 30 ℃ and T is less than 35 ℃, the opening degrees of the coal gas inlet valve and the coal gas outlet valve are adjusted to 1/2; when the temperature T of the coal gas is higher than 35 ℃, the opening degrees of the coal gas inlet valve and the coal gas outlet valve are adjusted to 1/4; when the temperature T of the coal gas is less than 25 ℃, judging the water quality condition of the upper section of circulating water tank, and starting the purification program of the upper section of circulating water tank if the water quality condition of the upper section of circulating water tank does not reach the standard; and when the temperature T of the coal gas is less than 25 ℃, judging the water quality condition of the lower section of circulating water tank, and starting a purification program of the lower section of circulating water tank if the water quality condition does not reach the standard. The invention can improve the cooling efficiency of coal gas and realize the automatic control of pollution discharge and water supplement of the water circulation system of the primary cooler.)

1. The utility model provides a primary cooler water circulating system which characterized in that: the coal gas coking device comprises a primary cooler (1) for cooling coal gas obtained by coking, an upper section water circulation device (2) for cooling the coal gas at one section of the primary cooler (1), a lower section water circulation device (3) for cooling the coal gas at the second section of the primary cooler (1), an underground water replenishing device (4) for further cooling the coal gas at the second section of the primary cooler (1) together with the lower section water circulation device (3), a communicating valve (5) for controlling the liquid level balance of the upper section water circulation device (2) and the lower section water circulation device (3) and a primary cooler control station DCS (6).

2. The primary cooler water circulation system according to claim 1, wherein: the primary cooler (1) comprises a coal gas inlet pipeline (1-1) provided with a coal gas inlet valve (1-2), and a coal gas outlet pipeline (1-3) provided with a temperature sensor (1-5) and a coal gas outlet valve (1-4) in sequence.

3. The primary cooler water circulation system according to claim 1, wherein: the upper-section water circulating device (2) comprises an upper-section circulating water pool (2-1) for storing circulating water, an upper-section circulating water return pipeline (2-2) for connecting an inlet of the upper-section circulating water pool (2-1) with a first-section water outlet of the primary cooler (1), an upper-section circulating water inlet pipeline (2-3) for connecting an outlet of the upper-section circulating water pool (2-1) with the first-section water inlet of the primary cooler (1) and an upper-section sewage discharge pipeline (2-4) arranged at the bottom of the upper-section circulating water pool (2-1); a first liquid level sensor (2-5) is arranged on the upper section circulating water tank (2-1); a first water pump (2-6) and a first valve (2-7) for providing power for upper-section water circulation are arranged on the upper-section circulating water inlet pipeline (2-3); an upper-section blowdown valve (2-8) is arranged on the upper-section blowdown pipeline (2-4).

4. The primary cooler water circulation system according to claim 1, wherein: the lower section water circulating device (3) comprises a lower section circulating water pool (3-1) for storing circulating water, a lower section circulating water return pipeline (3-2) for connecting an inlet of the lower section circulating water pool (3-1) with a second section water outlet of the primary cooler (1), a lower section circulating water inlet pipeline (3-3) for connecting an outlet of the lower section circulating water pool (3-1) with the second section water inlet of the primary cooler (1), and a lower section sewage discharge pipeline (3-4) arranged at the bottom of the lower section circulating water pool (3-1); a second liquid level sensor (3-5) is arranged on the lower circulating water pool (3-1); a second water pump (3-6) and a second valve (3-7) for providing power for lower water circulation are arranged on the lower circulating water inlet pipeline (3-3); and a lower-section blowdown valve (3-8) is arranged on the lower-section blowdown pipeline (3-4).

5. The primary cooler water circulation system according to claim 3 or 4, wherein: the communicating valve (5) is arranged on a pipeline between the upper section of circulating water return pipeline (2-2) and the lower section of circulating water return pipeline (3-2).

6. The primary cooler water circulation system according to claim 1, wherein: the underground water replenishing device (4) comprises an underground water replenishing pipeline (4-1) which is connected with underground water and a lower section circulating water inlet pipeline (3-3); and an underground water pump (4-2) and an underground water replenishing valve (4-3) which provide power for underground water to flow into the lower circulating water inlet pipeline (3-3) are arranged on the underground water replenishing pipeline (4-1).

7. The primary cooler water circulation system according to claim 1, wherein: the primary cooler control station DCS (6) acquires data of the temperature sensors (1-5), the first liquid level sensors (2-5) and the second liquid level sensors (3-5), and controls the opening degrees of the gas inlet valves (1-2) and the gas outlet valves (1-4), the opening degrees of the first water pumps (2-6), the first valves (2-7), the second water pumps (3-6), the second valves (3-7), the underground water pumps (4-2), the underground water replenishing valves (4-3), the upper-section blow-down valves (2-8), the lower-section blow-down valves (3-8) and the on-off valve (5).

8. A control method using the primary cooler water circulation system according to any one of claims 1 to 7, characterized by: the method comprises the following steps:

s1, acquiring the coal gas temperature T at the outlet of the primary cooler (1) measured by the temperature sensor (1-5) by the primary cooler control station DCS (6);

when the gas temperature T in S2 and S1 is higher than 25 ℃, a primary cooler control station DCS (6) starts an underground water pump (4-2) and an underground water replenishing valve (4-3);

when the temperature of the coal gas in S3 and S1 is 30 ℃ and T is less than 35 ℃, the primary cooler control station DCS (6) further adjusts the opening degrees of a coal gas inlet valve (1-2) and a coal gas outlet valve (1-4) to 1/2;

when the gas temperature T in S4 and S1 is higher than 35 ℃, the primary cooler control station DCS (6) further adjusts the opening degrees of the gas inlet valve (1-2) and the gas outlet valve (1-4) to 1/4;

when the temperature T of the coal gas in S5 and S1 is less than 25 ℃, the water quality condition of the upper section of the circulating water tank (2-1) is judged, and if the water quality condition is not good, the primary cooler control station DCS (6) starts the purification program of the upper section of the circulating water tank (2-1);

and when the temperature T of the coal gas in S6 and S1 is less than 25 ℃, judging the water quality condition of the lower circulating water tank (3-1), and starting a purification program of the lower circulating water tank (3-1) by a primary cooler control station DCS (6) if the water quality condition is not good.

9. The method for controlling a primary cooler water circulation system according to claim 8, wherein: in S5, the purification procedure of the upper section of the circulating water pool (2-1) specifically comprises the following steps:

s5.1, starting an upper-section blow-down valve (2-8) by a primary cooler control station DCS (6), and acquiring a liquid level L1 of a first liquid level sensor (2-5) for measuring the upper-section circulating water tank (2-1) in real time;

s5.2, when the liquid level L1 is less than 4.5 m, the primary cooler control station DCS (6) closes the upper-section blow-down valve (2-8), opens the underground water pump (4-2), the underground water replenishing valve (4-3) and the communicating valve (5) and replenishes water for the upper-section circulating water pool (2-1);

and S5.3, when the liquid level L1 is more than 5 m, the primary cooler control station DCS (6) closes the underground water pump (4-2), the underground water replenishing valve (4-3) and the communicating valve (5) to complete purification of the upper section of circulating water pool (2-1).

10. The method for controlling a primary cooler water circulation system according to claim 8, wherein: in S6, the purification procedure of the lower circulating water pool (3-1) specifically comprises the following steps:

s6.1, starting a lower-section blow-down valve (3-8) by a primary cooler control station DCS (6), and acquiring a liquid level L2 of a lower-section circulating water tank (3-1) measured by a second liquid level sensor (3-5) in real time;

s6.2, when the liquid level L2 is less than 4.5 m, closing a lower-section blow-down valve (3-8) by a primary cooler control station DCS (6), and opening an underground water pump (4-2) and an underground water replenishing valve (4-3) to replenish water for a lower-section circulating water pool (3-1);

s6.3, when the liquid level L2 is more than 5 m, the primary cooler control station DCS (6) closes the underground water pump (4-2) and the underground water replenishing valve (4-3), and the purification of the lower section circulating water pool (3-1) is completed.

Technical Field

The invention relates to the technical field of primary coolers, in particular to a primary cooler water circulation system and a control method thereof.

Background

In the coking production process, the temperature of the coal gas after being sprayed and cooled by circulating ammonia water of the ascending pipe and the gas collecting pipe is still as high as 80-90 ℃, and the coal gas contains a large amount of tar, water vapor and other impurities. In order to further cool the coal gas, condensed water vapor, tar, naphthalene vapor and the like, reduce the volume of the coal gas, facilitate conveying and save power required by conveying the coal gas, the primary cooler is used as a first process for cooling and cooling the coal gas in a chemical production operation area, and the cooling of the coal gas is realized through the contact heat exchange of the coal gas between a pipe layer and a shell layer by using medium-low temperature water, so that the key effect is played for improving the subsequent process conditions, improving the removal effect of coal gas impurities and reducing the blockage of the primary cooler.

However, in the prior art, because a steam type refrigerator is configured, the steam type refrigerator is restricted by a factory condition production process, the continuous and stable operation of the refrigerator cannot be guaranteed due to unstable steam pressure, the temperature control of the lower segment of coal gas is difficult to meet the process control requirement (20-25 ℃), and due to the influence of impurities in the coal gas, medium-low temperature circulating water also needs to be periodically subjected to manual pollution discharge, and groundwater water replenishing is called.

Therefore, in order to improve the cooling efficiency of the gas and realize automatic control of pollution discharge and water supplement, it is necessary to develop a water circulation system of a primary cooler and a control method thereof.

Disclosure of Invention

The invention aims to provide a primary cooler water circulation system and a control method thereof, which can improve the cooling efficiency of coal gas and realize automatic control of pollution discharge and water supplement of the primary cooler water circulation system.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a water circulation system of a primary cooler comprises the primary cooler for cooling coal gas obtained by coking, an upper section water circulation device for cooling the coal gas at one section of the primary cooler, a lower section water circulation device for cooling the coal gas at the second section of the primary cooler, an underground water replenishing device for further cooling the coal gas at the second section of the primary cooler together with the lower section water circulation device, a communicating valve for controlling the liquid level balance of the upper section water circulation device and the lower section water circulation device, and a primary cooler control station DCS.

The technical scheme of the invention is further improved as follows: the primary cooler comprises a coal gas inlet pipeline provided with a coal gas inlet valve and a coal gas outlet pipeline provided with a temperature sensor and a coal gas outlet valve in sequence.

The technical scheme of the invention is further improved as follows: the upper-section water circulating device comprises an upper-section circulating water tank for storing circulating water, an upper-section circulating water return pipeline for connecting an inlet of the upper-section circulating water tank with a first-section water outlet of the primary cooler, an upper-section circulating water inlet pipeline for connecting an outlet of the upper-section circulating water tank with a first-section water inlet of the primary cooler and an upper-section sewage discharge pipeline arranged at the bottom of the upper-section circulating water tank; a first liquid level sensor is arranged on the upper section circulating water tank; a first water pump and a first valve for providing power for upper-section water circulation are arranged on the upper-section circulation water inlet pipeline; and an upper-section blow-off valve is arranged on the upper-section blow-off pipeline.

The technical scheme of the invention is further improved as follows: the lower section water circulating device comprises a lower section circulating water tank for storing circulating water, a lower section circulating water return pipeline for connecting an inlet of the lower section circulating water tank with a second-stage water outlet of the primary cooler, a lower section circulating water inlet pipeline for connecting an outlet of the lower section circulating water tank with the second-stage water inlet of the primary cooler, and a lower section sewage discharge pipeline arranged at the bottom of the lower section circulating water tank; a second liquid level sensor is arranged on the lower circulating water pool; a second water pump and a second valve for providing power for lower-section water circulation are arranged on the lower-section circulating water inlet pipeline; and a lower-section blow-down valve is arranged on the lower-section blow-down pipeline.

The technical scheme of the invention is further improved as follows: and the communicating valve is arranged on a pipeline between the upper section of circulating water return pipeline and the lower section of circulating water return pipeline.

The technical scheme of the invention is further improved as follows: the underground water supplementing device comprises an underground water supplementing pipeline which is connected with underground water and a lower section circulating water inlet pipeline; and an underground water pump and an underground water replenishing valve which provide power for underground water to flow into the lower circulating water inlet pipeline are arranged on the underground water replenishing pipeline.

The technical scheme of the invention is further improved as follows: the primary cooler control station DCS acquires data of the temperature sensor, the first liquid level sensor and the second liquid level sensor, and controls the opening degrees of the gas inlet valve and the gas outlet valve and the opening and closing of the first water pump, the first valve, the second water pump, the second valve, the underground water pump, the underground water supplement valve, the upper-section blowoff valve, the lower-section blowoff valve and the communication valve.

A control method of a primary cooler water circulation system comprises the following steps:

s1, acquiring the coal gas temperature T of the primary cooler outlet measured by the temperature sensor by the primary cooler control station DCS;

when the gas temperature T in S2 and S1 is higher than 25 ℃, the primary cooler control station DCS starts an underground water pump and an underground water replenishing valve;

when the temperature of the coal gas in S3 and S1 is 30 ℃ and T is less than 35 ℃, the primary cooler control station DCS further adjusts the opening degrees of a coal gas inlet valve and a coal gas outlet valve to 1/2;

when the gas temperature T in S4 and S1 is higher than 35 ℃, the primary cooler control station DCS further adjusts the opening degrees of a gas inlet valve and a gas outlet valve to 1/4;

when the gas temperature T in S5 and S1 is less than 25 ℃, the water quality condition of the upper section of circulating water pool is judged, and if the water quality condition is not good, the upper section of circulating water pool purification program is started by a primary cooler control station DCS;

and when the temperature T of the coal gas in S6 and S1 is less than 25 ℃, judging the water quality condition of the lower section of circulating water tank, and starting a purification program of the lower section of circulating water tank by a primary cooler control station DCS if the water quality condition is not good.

The technical scheme of the invention is further improved as follows: in S5, the upper stage circulating water tank purification process specifically includes the following steps:

s5.1, starting an upper-section blow-down valve by a primary cooler control station DCS, and acquiring a liquid level L1 of an upper-section circulating water tank measured by a first liquid level sensor in real time;

s5.2, when the liquid level L1 is less than 4.5 m, the primary cooler control station DCS closes the upper-section blow-down valve, and opens the underground water pump, the underground water replenishing valve and the communicating valve to replenish water for the upper-section circulating water pool;

and S5.3, when the liquid level L1 is more than 5 m, the primary cooler control station DCS closes the underground water pump, the underground water replenishing valve and the communicating valve to complete the purification of the upper section of circulating water pool.

The technical scheme of the invention is further improved as follows: in S6, the lower stage circulation water tank purification process specifically includes the following steps:

s6.1, starting a lower-section blowdown valve by a primary cooler control station DCS, and acquiring a liquid level L2 of a lower-section circulating water tank measured by a second liquid level sensor in real time;

s6.2, when the liquid level L2 is less than 4.5 m, closing a lower-section blowdown valve by the primary cooler control station DCS, and opening an underground water pump and an underground water replenishing valve to replenish water for a lower-section circulating water tank;

s6.3, when the liquid level L2 is larger than 5 m, the primary cooler control station DCS closes the underground water pump and the underground water replenishing valve to complete the purification of the lower section circulating water pool.

Due to the adoption of the technical scheme, the invention has the technical progress that:

1. according to the invention, the coal gas temperature sensor on the coal gas outlet pipeline is introduced into the primary cooler control station DCS, and the opening degree of the coal gas inlet valve and the opening degree of the coal gas outlet valve are controlled by the primary cooler control station DCS, so that the automatic adjustment of the coal gas flow according to the coal gas temperature is realized, and the coal gas cooling efficiency is improved.

2. According to the invention, by adding the underground water replenishing device and automatically starting the device by the primary cooler control station DCS under the condition that the temperature of the coal gas is higher, the cooling efficiency of the lower section of the primary cooler is improved, and impurities in the coal gas are reduced.

3. According to the invention, the information of the liquid level meter is obtained through the primary cooler control station DCS, and the opening and closing of the sewage discharge valve are automatically controlled, so that the automatic sewage discharge of the upper and lower sections of the circulating water tank is realized.

4. According to the underground water replenishing device, the upper and lower sections of the circulating water pool are communicated through the communicating valve, the upper section of the circulating water pool is automatically replenished through the underground water replenishing device, the mode of calling underground water for indirect water replenishing is changed, and the underground water replenishing efficiency is improved.

5. The invention improves the cooling efficiency of the coal gas by setting a reasonable control method and realizes the automatic control of pollution discharge and water supplement of the water circulation system of the primary cooler.

Drawings

FIG. 1 is a flow chart of a control method of the present invention;

FIG. 2 is a schematic diagram of the system architecture of the present invention;

wherein, 1, a primary cooler, 1-1, a coal gas inlet pipeline, 1-2, a coal gas inlet valve, 1-3, a coal gas outlet pipeline, 1-4, a coal gas outlet valve, 1-5, a temperature sensor, 2, an upper water circulating device, 2-1, an upper circulating water tank, 2-2, an upper circulating water return pipeline, 2-3, an upper circulating water inlet pipeline, 2-4, an upper sewage discharge pipeline, 2-5, a first liquid level sensor, 2-6, a first water pump, 2-7, a first valve, 2-8, a sewage discharge valve, 3, a lower water circulating device, 3-1, a lower circulating water tank, 3-2, a lower circulating water tank, 3-3, a lower circulating water inlet pipeline, 3-4, a lower sewage discharge pipeline, 3-5 and a second liquid level sensor, 3-6 parts of a second water pump, 3-7 parts of a second valve, 3-8 parts of a lower-section blow-down valve, 4 parts of an underground water replenishing device, 4-1 parts of an underground water replenishing pipeline, 4-2 parts of an underground water pump, 4-3 parts of an underground water replenishing valve, 5 parts of a communicating valve, 6 parts of a primary cooler control station DCS.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 2, a primary cooler water circulation system includes a primary cooler 1 for cooling the coal gas obtained by coking, an upper water circulation device 2 for cooling the coal gas at a first section of the primary cooler 1, a lower water circulation device 3 for cooling the coal gas at a second section of the primary cooler 1, an underground water replenishing device 4 for further cooling the coal gas at the second section of the primary cooler 1 together with the lower water circulation device 3, a communicating valve 5 for controlling the liquid level balance between the upper water circulation device 2 and the lower water circulation device 3, and a primary cooler control station DCS 6.

The primary cooler 1 comprises a coal gas inlet pipeline 1-1 provided with a coal gas inlet valve 1-2, and a coal gas outlet pipeline 1-3 provided with a temperature sensor 1-5 and a coal gas outlet valve 1-4 in sequence, wherein the coal gas temperature sensor 1-5 on the coal gas outlet pipeline 1-1 is introduced into a primary cooler control station DCS6, and the opening degree of the coal gas inlet valve 1-2 and the opening degree of the coal gas outlet valve 1-3 are controlled by a primary cooler control station DCS5, so that the automatic adjustment of coal gas flow according to coal gas temperature is realized.

The upper-section water circulating device 2 comprises an upper-section circulating water pool 2-1 for storing circulating water, an upper-section circulating water return pipeline 2-2 for connecting an inlet of the upper-section circulating water pool 2-1 with a first-section water outlet of the primary cooler 1, an upper-section circulating water inlet pipeline 2-3 for connecting an outlet of the upper-section circulating water pool 2-1 with a first-section water inlet of the primary cooler 1 and an upper-section sewage discharge pipeline 2-4 arranged at the bottom of the upper-section circulating water pool 2-1; a first liquid level sensor 2-5 is arranged on the upper section circulating water tank 2-1; a first water pump 2-6 and a first valve 2-7 which provide power for upper-section water circulation are arranged on the upper-section circulating water inlet pipeline 2-3; and an upper-section blowdown valve 2-8 is arranged on the upper-section blowdown pipeline 2-4.

The lower water circulating device 3 comprises a lower circulating water tank 3-1 for storing circulating water, a lower circulating water return pipeline 3-2 for connecting an inlet of the lower circulating water tank 3-1 with a second-stage water outlet of the primary cooler 1, a lower circulating water inlet pipeline 3-3 for connecting an outlet of the lower circulating water tank 3-1 with a second-stage water inlet of the primary cooler 1 and a lower sewage discharge pipeline 3-4 arranged at the bottom of the lower circulating water tank 3-1; a second liquid level sensor 3-5 is arranged on the lower circulating water tank 3-1; a second water pump 3-6 and a second valve 3-7 for providing power for lower water circulation are arranged on the lower circulating water inlet pipeline 3-3; and a lower section blow-down valve 3-8 is arranged on the lower section blow-down pipeline 3-4.

The communicating valve 5 is arranged on a pipeline between the upper section of circulating water return pipeline 2-2 and the lower section of circulating water return pipeline 3-2; the upper section of the circulating water tank and the lower section of the circulating water tank are communicated by arranging the communicating valve 5, and the upper section of the circulating water tank 2-1 is automatically supplemented with water by the underground water supplementing device 4, so that the mode of calling underground water for indirect water supplement is changed, and the efficiency of underground water supplementing is improved.

Transforming a lower section water inlet pipeline of the primary cooler by utilizing a standby process of the primary cooler, adding an underground water replenishing pipeline 4-1 with the external diameter size of phi 80, and installing an underground water pump 4-2 and an underground water replenishing valve 4-3 which provide power for the underground water to flow into a lower section circulating water inlet pipeline 3-3; by adding the underground water supplementing device 4 and automatically starting the primary cooler control station DCS6 under the condition that the temperature of the coal gas is higher than the set temperature, the cooling efficiency of the lower section of the primary cooler is improved, and impurities in the coal gas are reduced.

The primary cooler control station DCS6 collects data of the temperature sensors 1-5, the first liquid level sensors 2-5 and the second liquid level sensors 3-5, and controls the opening degrees of the gas inlet valves 1-2 and the gas outlet valves 1-4, the opening degrees of the first water pumps 2-6, the first valves 2-7, the second water pumps 3-6, the second valves 3-7, the underground water pumps 4-2, the underground water replenishing valves 4-3, the upper section blowoff valves 2-8, the lower section blowoff valves 3-8 and the on-off valve 5 to be opened and closed.

When the upper-section water circulation system of the primary cooler normally operates, the first water pump 2-6 and the first valve 2-7 are opened, upper-section circulating water enters the first section of the primary cooler 1 from the upper-section circulating water tank 2-1 through the upper-section circulating water inlet pipeline 2-3 to carry out primary cooling on coal gas, the coal gas flows back to the upper-section circulating water tank 2-1 through the upper-section circulating water return pipeline 2-2, and the liquid level of the upper-section circulating water tank 2-1 is kept at 5 m.

When the lower-section water circulation system of the primary cooler normally operates, the second water pump 3-6 and the second valve 3-7 are opened, the lower-section circulating water enters the primary cooler 1 second section from the lower-section circulating water tank 3-1 through the lower-section circulating water inlet pipeline 3-3 to further cool the coal gas, and flows back to the lower-section circulating water tank 3-1 through the lower-section circulating water return pipeline 3-2, the liquid level is kept at 5 meters, and the temperature of the cooled coal gas is 20-25 ℃.

As shown in fig. 1, a method for controlling a water circulation system of a primary cooler includes the following steps:

s1, the primary cooler control station DCS6 obtains the coal gas temperature T of the outlet of the primary cooler 1 measured by the temperature sensor 1-5.

And when the temperature T of the coal gas in S2 and S1 is more than 25 ℃, the primary cooler control station DCS6 starts the underground water pump 4-2 and the underground water replenishing valve 4-3.

And when the temperature of the coal gas in the S3 and S1 is 30 ℃ and T is less than 35 ℃, the primary cooler control station DCS6 further adjusts the opening degrees of the coal gas inlet valve 1-2 and the coal gas outlet valve 1-4 to 1/2, adjusts the flow rate of the coal gas and improves the efficiency of coal gas cooling.

When the gas temperature T in S4 and S1 is higher than 35 ℃, the primary cooler control station DCS6 adjusts the opening degrees of the gas inlet valve 1-2 and the gas outlet valve 1-4 to 1/4, adjusts the gas flow and improves the gas cooling efficiency.

When the temperature T of coal gas in S5 and S1 is less than 25 ℃, the water quality condition of the upper section of circulating water tank 2-1 is judged, if the water quality condition is not good, the primary cooler control station DCS6 starts the purification program of the upper section of circulating water tank 2-1:

s5.1, opening an upper-section blow-down valve 2-8 by a primary cooler control station DCS6, and acquiring a liquid level L1 of a first liquid level sensor 2-5 measured upper-section circulating water pool 2-1 in real time;

s5.2, when the liquid level L1 is less than 4.5 m, the primary cooler control station DCS6 closes the upper-section blow-down valve 2-8, the underground water pump 4-2, the underground water replenishing valve 4-3 and the communicating valve 5 are started, underground water enters the lower-section circulating water pool 3-1, the liquid level of the lower-section circulating water pool 3-1 is improved, the liquid levels of the lower-section circulating water pool 3-1 and the upper-section circulating water pool 2-1 are balanced through the communicating valve 5, and water is replenished to the upper-section circulating water pool 2-1;

s5.3, when the liquid level L1 is more than 5 m, the primary cooler control station DCS6 closes the underground water pump 4-2, the underground water replenishing valve 4-3 and the communicating valve 5, and the pollution discharge of the upper section of circulating water pool 2-1 is completed.

When the temperature T of the coal gas in S6 and S1 is less than 25 ℃, the water quality condition of the lower circulating water tank 3-1 is judged, and if the water quality condition is not good, the primary cooler control station DCS6 starts the purification program of the lower circulating water tank 3-1:

s6.1, starting a lower-section blow-down valve 3-8 by a primary cooler control station DCS6, and acquiring a liquid level L2 of a lower-section circulating water tank 3-1 measured by a second liquid level sensor 3-5 in real time;

s6.2, when the liquid level L2 is less than 4.5 m, closing a lower-section blow-down valve 3-8 by a primary cooler control station DCS6, and opening an underground water pump 4-2 and an underground water replenishing valve 4-3 to replenish water for a lower-section circulating water pool 3-1;

s6.3, when the liquid level L2 is more than 5 m, the primary cooler control station DCS6 closes the underground water pump 4-2 and the underground water replenishing valve 4-3, and the sewage discharge of the lower section of circulating water pool 3-1 is completed.

In conclusion, the gas flow rate can be automatically adjusted according to the gas temperature by introducing the gas temperature sensor on the gas outlet pipeline into the primary cooler control station DCS and controlling the opening degrees of the gas inlet valve and the gas outlet valve through the primary cooler control station DCS; by adding the underground water replenishing device and automatically starting the device by the primary cooler control station DCS under the condition that the temperature of the coal gas is higher, the cooling efficiency of the lower section of the primary cooler is improved, and impurities in the coal gas are reduced; acquiring information of a liquid level meter through a primary cooler control station DCS, and automatically controlling the opening and closing of a sewage discharge valve to realize automatic sewage discharge of an upper section of circulating water tank and a lower section of circulating water tank; the upper section of the circulating water tank is communicated with the lower section of the circulating water tank through the communication valve, and the upper section of the circulating water tank is automatically supplemented with water through the underground water supplementing device, so that the method of calling underground water for indirect water supplement is changed, and the efficiency of underground water supplementing is improved; the reasonable control method is arranged to improve the cooling efficiency of the coal gas and realize the automatic control of the pollution discharge and water supplement of the water circulation system of the primary cooler.