阅读说明：本技术 一种煤焦油深加工罐区焦油槽尾气密闭收集防堵装置及方法 (Airtight closed collecting and anti-blocking device and method for tail of tar tank in deep coal tar processing tank area ) 是由 李艳敏 戴建国 李桂娇 于 2021-08-19 设计创作，主要内容包括：本发明公开了一种煤焦油深加工罐区焦油槽尾气密闭收集防堵装置及方法,涉及煤焦油尾气处理技术领域,采用了“氮气补压+尾气排放控制+氮气保护式压力监测”的技术,既大幅减少了槽罐尾气排放总量,又解决了萘堵塞的问题,确保了现有槽罐的安全和可靠运行,完全满足挥发性有机物的无组织排放控制标准,极大改善环境空气质量。能较方便地拆卸、维修,同时具有较强的稳固性。(The invention discloses a device and a method for airtight closed collection and anti-blocking of a tar tank tail in a coal tar deep processing tank area, which relate to the technical field of coal tar tail gas treatment, and adopt the technology of 'nitrogen pressure compensation, tail gas emission control and nitrogen protection type pressure monitoring', thereby greatly reducing the total amount of the tail gas emission of a tank, solving the problem of naphthalene blockage, ensuring the safe and reliable operation of the existing tank, completely meeting the unorganized emission control standard of volatile organic compounds, and greatly improving the quality of ambient air. Can be conveniently disassembled and maintained, and has stronger stability.)

1. The utility model provides a coal tar deep-processing tank field tar groove tail airtight is closed and is collected anti-blocking device, includes groove jar (18), flange blind plate (12), breather valve (17) and pressure transmitter (11), breather valve (17) set up in groove jar (18) top center, flange blind plate (12) set up in groove jar (18) top access hole, its characterized in that:

the pressure nitrogen supplied from the outside is connected with the inlet side of a first manual valve through a pipeline, the outlet side of the first manual valve is connected with the inlet side of a filter (3) through a pipeline provided with a first pressure gauge (2), the outlet side of the filter (3) is connected with the inlet side of a self-operated pressure reducing valve (4) through a pipeline, and the outlet side of the self-operated pressure reducing valve (4) is divided into three pipelines, namely a main branch pipe, a bypass branch pipe and an auxiliary branch pipe, through a pipeline provided with a second pressure gauge (5); the main branch pipe is connected with the inlet side of a second manual valve (6), the outlet side of the second manual valve (6) is connected with the inlet side of a pneumatic membrane regulating valve (7) through a pipeline, and the outlet side of the pneumatic membrane regulating valve (7) is connected with the inlet side of a third manual valve (8) through a pipeline; the bypass branch pipe is connected with the inlet side of a five manual valve (10), the outlet side of the five manual valve (10) is connected with the flange blind plate (12) after being merged with the outlet side pipeline of a three manual valve (8) through a pipeline, and is communicated with the gas phase space in the tank (18); the auxiliary branch pipe is connected with the inlet side of a manual valve IV (9), and the outlet side of the manual valve IV (9) is connected with the flange blind plate (12) through a pipeline and communicated with the gas phase space in the tank (18); the pressure transmitter (11) is arranged on a pipeline, wherein the outlet side of the manual valve IV (9) is connected with the flange blind plate (12);

the tail gas in the tank (18) passes through the flange blind plate (12) and is connected with the inlet side of a manual valve six (13) through a pipeline, the outlet side of the manual valve six (13) is connected with the inlet side of a flame arrester (14) through a pipeline, the outlet side of the flame arrester (14) is connected with the inlet side of a tail gas control switch valve (15) through a pipeline, the outlet side of the tail gas control switch valve (15) is connected with the inlet side of a manual valve seven (16) through a pipeline, and the outlet side of the manual valve seven (16) is connected with an external tail gas collecting main pipe.

2. The airtight closed collecting and anti-blocking device for the tar trough tail of the coal tar deep processing tank field according to claim 1 is characterized in that: the length of the pipeline where the pressure transmitter (11) is located extending into the tank (18) is 1 m.

3. An airtight closed collection and anti-blocking method for the tail of a tar tank in a deep coal tar processing tank area is characterized by comprising the following steps: the airtight collection and anti-blocking device is applied to the tail of the tar tank in the deep coal tar processing tank field according to any one of claims 1 to 2,

supplementing nitrogen to the tank (18) by adopting a secondary pressure reduction process, reducing the pressure to 0.05-0.09 MPa in the first stage and reducing the pressure to 100-300 Pa in the second stage so as to balance the pressure reduction and even negative pressure of the tank (18) during discharging and ensure that the tank (18) is not deflated under the pressure of 100-300 Pa;

the secondary pressure reducing valve is interlocked with the pressure transmitter (11): when the pressure of the tank (18) is higher than 300 Pa, the secondary pressure reducing valve is automatically closed; when the pressure of the tank (18) is less than 100Pa, the secondary pressure reducing valve is automatically opened.

4. The airtight closed collecting and anti-blocking method for the tar trough tail of the coal tar deep processing tank field according to claim 3, characterized in that: when the pressure in the tank (18) rises, the tail gas in the tank (18) is discharged into a tail gas main pipe through a tail gas discharge pipeline, and a tail gas control switch valve (15) is interlocked with the pressure transmitter (11): when the pressure of the tank (18) is higher than 600-900 Pa, the tail gas control switch valve (15) is opened; when the pressure of the tank (18) is reduced to less than 600Pa, the tail gas control switch valve (15) is closed.

5. The airtight closed collecting and anti-blocking method for the tar trough tail of the coal tar deep processing tank field according to claim 3, characterized in that: the tail gas emission pipeline adopts heat preservation and heat preservation measures, and the temperature is kept at 60-80 ℃.

6. The airtight closed collecting and anti-blocking method for the tar trough tail of the coal tar deep processing tank field according to claim 3, characterized in that: under normal conditions, the pressure in the tank (18) does not reach the values of the exhalation pressure and the inhalation pressure of the breather valve (17) which need to be opened, so that the breather valve (17) is automatically closed, and tail gas cannot be exhausted and outside air cannot be inhaled; when the device fails or nitrogen is interrupted and instrument wind is interrupted, the pressure transmitter (11) can alarm, and the breather valve (17) starts to perform a breathing function to ensure the safety of the tank (18).

7. The airtight closed collecting and anti-blocking method for the tar trough tail of the coal tar deep processing tank field according to claim 3, characterized in that: under normal conditions, the manual valve five (10) is closed, and other manual valves are opened; when the pneumatic membrane regulating valve (7) breaks down and needs maintenance, the pressure of the manual valve five (10) can be manually opened according to the pressure of the tank (18) for pressure compensation, and the pneumatic membrane regulating valve (7) can be maintained after the manual valve two (6) and the manual valve three (8) are closed, so that other functions of the device are not affected.

8. The airtight closed collecting and anti-blocking method for the tar trough tail of the coal tar deep processing tank field according to claim 3, characterized in that: be provided with pressure monitoring device, adopt pressure transmitter (11) to detect, 4 ~ 20mA teletransmission signal, after the nitrogen gas one-level decompression, give in a small burst the root pipe of detection of pressure transmitter (11) is as the protective gas, avoids the root pipe of pressure transmitter (11) to block up and the distortion.

Technical Field

The invention relates to the technical field of coal tar tail gas treatment, in particular to an airtight closed collecting and anti-blocking device and method for a tar tank tail in a coal tar deep processing tank field.

Background

Generally, Volatile Organic Compounds (VOCs) abatement systems include a tail gas collection device and a tail gas purification device. In a coking plant, coking coal is subjected to a coking process to produce chemical products such as coke, coal tar, coke oven gas, crude benzene and the like. The tail gas discharged from a tar groove in the deep processing process of the coal tar is mainly big respiratory gas: when the tank is fed, the liquid level of the tank rises, the gas phase space at the upper part of the tank is reduced, the pressure rises, and the tail gas is discharged through the breather valve; when the tank discharges, the liquid level of the tank is reduced, the upper gas phase space is enlarged, the pressure is reduced, the external air can be sucked into the tank through the breather valve, and the tank does not discharge tail gas at the moment. When the tank does not feed or discharge, the pressure in the tank is stable, and the tank does not exhaust tail gas or suck air. When the air temperature and the air pressure change, the pressure inside and outside the tank is unbalanced, and small breathing discharge is generated. The tail gas discharge of the tank is discontinuous and discontinuous regardless of the large breath or the small breath.

The tail gas discharged from the tar tank has complex components, contains virulent malodorous substances such as hydrogen sulfide, sulfur dioxide and the like, and also contains a large amount of high-boiling-point, high-viscosity and easily-crystallized substances such as benzenes, naphthalenes, anthracenes, acenaphthenes, fluorenes, pyrenes, phenols and the like, and the substances are gaseous in the high-temperature storage environment of the tank, but are extremely easy to crystallize and become solid in the pipeline under the influence of temperature and concentration so as to block the pipeline, a valve and the like.

At present, the tail gas collection of the focus oil tank in the field is mainly carried out in a mode of a tail gas discharge pipeline and a manual valve in China, and the manual valve is in a normally open state as shown in figure 1. The tail gas of the storage tank is continuously discharged through a tail gas discharge pipe connected to a flange blind plate of an access hole in the top of the tank, and a manual valve is arranged on the tail gas discharge pipe and is in a normally open state. When the tank discharges materials or the pressure of the gas phase space in the tank is negative pressure, the outside air enters the tank from the suction inlet of the breather valve. The function of the pressure transmitter on the tank is to monitor the internal pressure of the tank. The method is mainly characterized in that the negative pressure of the tail gas pipeline is utilized to uninterruptedly extract the tail gas in the tank. The problems that exist are that: no matter whether the tank is fed or not, tail gas is always extracted, and the flow of the tail gas is large, so that the load of a rear-end tail gas treatment device is large, and the treatment cost is increased; when the tank discharges materials, outside air can be sucked into the tank, explosive gas (containing combustible gas and combustion-supporting oxygen) is formed in the upper space of the tank, and great potential safety hazard is brought; the tail gas discharge pipe, the breather valve, the pressure transmitter and the like of the tank are often blocked by easily crystallized substances such as naphthalene and the like due to thin pipelines and narrow airflow channels, so that pressure monitoring failure is caused, and the tank has overpressure risk.

Disclosure of Invention

The invention aims at the technical problems and overcomes the defects of the prior art, and provides an airtight closed collecting and anti-blocking device for the tail of a tar tank in a coal tar deep processing tank area, which comprises a tank, a flange blind plate, a breather valve and a pressure transmitter, wherein the breather valve is arranged at the center of the top of the tank, the flange blind plate is arranged at an access hole at the top of the tank,

the pressure nitrogen supplied from the outside is connected with the inlet side of the first manual valve through a pipeline, the outlet side of the first manual valve is connected with the inlet side of the filter through a pipeline provided with a first pressure gauge, the outlet side of the filter is connected with the inlet side of the self-operated pressure reducing valve through a pipeline, and the outlet side of the self-operated pressure reducing valve is divided into three pipelines, namely a main branch pipe, a bypass branch pipe and an auxiliary branch pipe, through a pipeline provided with a second pressure gauge; the main branch pipe is connected with the inlet side of the second manual valve, the outlet side of the second manual valve is connected with the inlet side of the pneumatic membrane regulating valve through a pipeline, and the outlet side of the pneumatic membrane regulating valve is connected with the inlet side of the third manual valve through a pipeline; the bypass branch pipe is connected with the inlet side of the fifth manual valve, and the outlet side of the fifth manual valve is connected with the flange blind plate after being converged with the outlet side pipeline of the third manual valve through a pipeline and is communicated with the gas phase space in the tank; the auxiliary branch pipe is connected with the inlet side of the manual valve IV, and the outlet side of the manual valve IV is connected with the flange blind plate through a pipeline and communicated with the gas phase space in the tank; the pressure transmitter is arranged on a pipeline, wherein the outlet side of the manual valve IV is connected with the flange blind plate;

tail gas in the tank is connected with the inlet side of the sixth manual valve through a pipeline for a flange blind plate, the outlet side of the sixth manual valve is connected with the inlet side of the flame arrester through a pipeline, the outlet side of the flame arrester is connected with the inlet side of the tail gas control switch valve through a pipeline, the outlet side of the tail gas control switch valve is connected with the inlet side of the seventh manual valve through a pipeline, and the outlet side of the seventh manual valve is connected with an external tail gas collecting main pipe.

The technical effects are as follows: the invention adopts the technology of nitrogen pressure compensation, tail gas emission control and nitrogen protection type pressure monitoring, not only greatly reduces the total amount of tail gas emission of the tank, but also solves the problem of naphthalene blockage, ensures the safe and reliable operation of the existing tank, completely meets the unorganized emission control standard of volatile organic compounds, and greatly improves the quality of ambient air. Can be conveniently disassembled and maintained, and has stronger stability.

The technical scheme of the invention is further defined as follows:

the airtight closed collecting and anti-blocking device for the tar tank tail of the coal tar deep processing tank area is characterized in that the length of a pipeline where a pressure transmitter is located extending into a tank is 1 m.

The invention also aims to provide an airtight closed collecting and anti-blocking method for the tail of the tar tank in the coal tar deep processing tank field, which is applied to an airtight closed collecting and anti-blocking device for the tail of the tar tank in the coal tar deep processing tank field,

supplementing nitrogen to the tank by adopting a secondary pressure reduction process, reducing the pressure of the primary pressure to 0.05-0.09 MPa, and reducing the pressure of the secondary pressure to 100-300 Pa so as to balance the pressure reduction and even negative pressure of the tank during discharging, and ensuring that the pressure of the tank is 100-300 Pa and cannot be deflated;

the secondary pressure reducing valve is interlocked with the pressure transmitter: when the pressure of the tank is higher than 300 Pa, the secondary pressure reducing valve is automatically closed; when the pressure of the tank is less than 100Pa, the secondary pressure reducing valve is automatically opened.

The method for collecting and preventing the blockage of the airtight closing of the tar tank tail in the coal tar deep processing tank area comprises the following steps that when the pressure in a tank rises, the tail gas in the tank is discharged into a tail gas main pipe through a tail gas discharge pipeline, and a tail gas control switch valve is interlocked with a pressure transmitter: when the pressure of the tank is higher than 600-900 Pa, the tail gas control switch valve is opened; when the pressure of the tank is reduced to less than 600Pa, the tail gas control switch valve is closed.

According to the method for airtight closed collection and anti-blocking of the tail of the tar tank in the coal tar deep processing tank area, a tail gas discharge pipeline adopts a heat preservation and heat preservation measure, and the temperature is kept at 60-80 ℃.

According to the airtight closed collecting and anti-blocking method for the tail of the tar tank in the coal tar deep processing tank area, under normal conditions, because the pressure in the tank does not reach the exhalation and inhalation pressure values required to be opened by the breather valve, the breather valve is automatically closed, and tail gas cannot be exhausted and outside air cannot be inhaled; when the device fails or nitrogen is interrupted and instrument wind is interrupted, the pressure transmitter can give an alarm, and the breather valve starts to play a breathing function to ensure the safety of the tank.

The method is provided with a pressure monitoring device, a pressure transmitter is used for detecting and transmitting signals in a 4-20 mA remote mode, and after nitrogen is subjected to primary pressure reduction, a detection root pipe of the pressure transmitter is divided into a small strand to serve as protective gas, so that distortion caused by blockage of the root pipe of the pressure transmitter is avoided.

The invention has the beneficial effects that:

(1) according to the invention, after nitrogen is subjected to primary pressure reduction, a small stream of nitrogen is sent to a detection root pipe of a pressure transmitter to be used as protective gas, so that the following situations are avoided: the easily crystallized and solidified components in the tank enter a detection root pipe of the pressure transmitter, so that the root pipe is blocked, the detection result of the pressure transmitter is distorted, and the actual pressure of the tank cannot be truly reflected; meanwhile, a valve interlocked with a detection value of the pressure transmitter can also act and fail, and an operator cannot find the tank in time through the pressure transmitter when the tank is in overpressure, so that the safety of the tank is endangered;

(2) the tail gas control switch valve is interlocked with the pressure transmitter, thereby avoiding disordered and continuous discharge of tail gas, greatly reducing the discharge amount of the tail gas and reducing the processing load and the investment cost of a rear-end tail gas purification device;

(3) the tail gas discharge pipeline adopts heat preservation and heat preservation measures, so that the tail gas discharge pipeline can be prevented from being blocked by easily crystallized and solidified components in the tail gas.

Drawings

FIG. 1 is a schematic diagram of background art;

FIG. 2 is a schematic structural view of the present invention;

wherein: 1. a first manual valve; 2. a first pressure gauge; 3. a filter; 4. a self-operated pressure reducing valve; 5. a second pressure gauge; 6. a second manual valve; 7. a pneumatic membrane regulating valve; 8. a manual valve III; 9. a manual valve IV; 10. a fifth manual valve; 11. a pressure transmitter; 12. a flange blind plate; 13. a manual valve VI; 14. a flame arrestor; 15. a tail gas control switch valve; 16. a manual valve seventh; 17. a breather valve; 18. and (4) a tank.

Detailed Description

The structure of the airtight closed collecting and anti-blocking device for the tar tank tail in the coal tar deep processing tank area is shown in fig. 2, and comprises a tank 18, a flange blind plate 12, a breather valve 17 and a pressure transmitter 11, wherein the breather valve 17 is arranged at the center of the top of the tank 18, the flange blind plate 12 is arranged at an access hole at the top of the tank 18,

the pressure nitrogen supplied from the outside is connected with the inlet side of the first manual valve through a pipeline, the outlet side of the first manual valve is connected with the inlet side of the filter 3 through a pipeline provided with a first pressure gauge 2, the outlet side of the filter 3 is connected with the inlet side of the self-operated pressure reducing valve 4 through a pipeline, and the outlet side of the self-operated pressure reducing valve 4 is divided into three pipelines, namely a main branch pipe, a bypass branch pipe and an auxiliary branch pipe, through a pipeline provided with a second pressure gauge 5; the main branch pipe is connected with the inlet side of a second manual valve 6, the outlet side of the second manual valve 6 is connected with the inlet side of a pneumatic membrane regulating valve 7 through a pipeline, and the outlet side of the pneumatic membrane regulating valve 7 is connected with the inlet side of a third manual valve 8 through a pipeline; the bypass branch pipe is connected with the inlet side of the five manual valves 10, and the outlet side of the five manual valves 10 is connected with the flange blind plate 12 after being converged with the outlet side pipeline of the three manual valves 8 through a pipeline and is communicated with the gas phase space in the tank 18; the auxiliary branch pipe is connected with the inlet side of a manual valve IV 9, and the outlet side of the manual valve IV 9 is connected with the flange blind plate 12 through a pipeline and communicated with the gas phase space in the tank 18; the pressure transmitter 11 is arranged on a pipeline connected with the flange blind plate 12 at the outlet side of the manual valve IV 9, and the length of the pipeline where the pressure transmitter 11 is located extending into the tank 18 is 1 m;

the tail gas in the tank 18 is connected with the inlet side of a manual valve six 13 through a flange blind plate 12 by a pipeline, the outlet side of the manual valve six 13 is connected with the inlet side of a flame arrester 14 by a pipeline, the outlet side of the flame arrester 14 is connected with the inlet side of a tail gas control switch valve 15 by a pipeline, the outlet side of the tail gas control switch valve 15 is connected with the inlet side of a manual valve seven 16 by a pipeline, and the outlet side of the manual valve seven 16 is connected with an external tail gas collecting main pipe.

The use method of the device comprises the following steps:

under normal conditions, because the pressure in the tank 18 does not reach the exhalation and inhalation pressure values required to be opened by the breather valve 17, the breather valve 17 is automatically closed, and tail gas cannot be exhausted and outside air cannot be inhaled; when the device fails or nitrogen is interrupted and instrument wind is interrupted, the pressure transmitter 11 will give an alarm, and the breather valve 17 starts to perform the function of breathing to ensure the safety of the tank 18. Be provided with pressure monitoring device, adopt pressure transmitter 11 to detect, 4 ~ 20mA teletransmission signal, after the nitrogen gas one-level decompression, divide a little to give pressure transmitter 11's detection root pipe as the protective gas, avoid pressure transmitter 11's root pipe to block up and the distortion. The tail gas emission pipeline adopts heat preservation and heat preservation measures, and the temperature is kept at 60-80 ℃.

Supplementing nitrogen to the tank 18 by adopting a secondary pressure reduction process, reducing the pressure to 0.05-0.09 MPa in the first stage and reducing the pressure to 100-300 Pa in the second stage so as to balance the pressure reduction and even negative pressure of the tank 18 during discharging and ensure that the tank 18 is 100-300 Pa and cannot be deflated; the secondary pressure reducing valve is interlocked with the pressure transmitter 11: when the pressure of the tank 18 is higher than 300 Pa, the secondary pressure reducing valve is automatically closed; when the pressure in the tank 18 is less than 100Pa, the secondary pressure reducing valve is automatically opened.

When pressure in the tank 18 rises, tail gas in the tank 18 is discharged to a tail gas main pipe through a tail gas discharge pipeline, and the tail gas control switch valve 15 is interlocked with the pressure transmitter 11: when the pressure of the tank 18 is higher than 600-900 Pa, the tail gas control switch valve 15 is opened; when the pressure in the tank 18 drops to less than 600Pa, the exhaust gas control on-off valve 15 is closed.

When the pressure in the tank 18 is low or vacuum is reached, the pressure is supplemented with nitrogen gas, so that air is prevented from entering the tank 18 to form an explosive gas atmosphere, and the intrinsic safety of the tank 18 is ensured.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.