阅读说明：本技术 煤气生产中粗苯气体处理工艺及其装置 (Process and device for treating crude benzene gas in coal gas production ) 是由 严业涛 扈文川 刘晓伟 于 2021-09-29 设计创作，主要内容包括：本发明涉及煤气生产中粗苯气体处理工艺及其装置,其处理装置主要包括储存罐、暂存罐、冷凝塔、压力自动控制装置等；本发明技术采用压力自动控制装置对储存罐进行内部压力进行自动调整,确保储存罐罐内压力的恒定,从而达到储存罐氮封的安全目的；煤气生产中和存储罐产生粗苯气体通过冷却塔冷却,粗苯和氮气得到回收利用；具有设计新颖、结构合理、使用方便的优点。(The invention relates to a process and a device for treating crude benzene gas in coal gas production, wherein the treatment device mainly comprises a storage tank, a temporary storage tank, a condensing tower, an automatic pressure control device and the like; the technology of the invention adopts the automatic pressure control device to automatically adjust the internal pressure of the storage tank, so as to ensure the constant pressure in the storage tank, thereby achieving the safety purpose of nitrogen sealing of the storage tank; the gas generated in the gas production neutralization storage tank is cooled by a cooling tower, and crude benzene and nitrogen are recycled; has the advantages of novel design, reasonable structure and convenient use.)

1. A crude benzene gas processing apparatus for in coal gas production which characterized in that: including pressure automatic control device, with the nitrogen gas pipeline that pressure automatic control device connects, with nitrogen gas pipeline and pressure sampling pipeline intercommunication, the holding vessel of storing crude benzene, with the jar is kept in to crude benzene that pressure automatic control device connects.

2. The crude benzene gas treatment device for gas production as claimed in claim 1, wherein the crude benzene temporary storage tank is connected with the crude benzene storage tank through a crude benzene transportation pipeline, and the nitrogen transportation pipeline is connected with the crude benzene storage tank through an automatic pressure control device;

the pressure sampling pipeline is connected with a supply pipeline of crude benzene gas and is connected with the cooling tower, and the pressure sampling pipeline is provided with a pressure sampling device;

the cooling tower is connected with the crude benzene temporary storage tank through a pipeline, so that crude benzene obtained by cooling is transferred to the crude benzene temporary storage tank;

the cooling tower is provided with a nitrogen gas discharge port;

the automatic pressure control device comprises an automatic pressure controller, and a compressed gas input pipe and a nitrogen input pipe which are connected into the automatic pressure controller in parallel;

and a pressure gauge, a breather valve of an oil filling flame arrester and a crude benzene discharge valve are arranged on the crude benzene storage tank.

3. A process for treating tail gas by using the crude benzene gas treatment device of claims 1-2, characterized in that: the process comprises the following specific steps: conveying the crude benzene gas to a cooling tower through a pipeline, allowing the obtained crude benzene liquid to enter a temporary storage tank for temporary storage so as to separate out a water phase in the crude benzene liquid, volatilizing the crude benzene to generate new crude benzene gas, and introducing nitrogen into the temporary storage tank for protection through a pressure control device; when the crude benzene solution is transferred to the storage tank, the pressure of the temporary storage tank is reduced, and nitrogen can be supplemented into the temporary storage tank through the pressure control device, so that the pressure is ensured to be constant and stable; the nitrogen gas from the cooling tower can be discharged into the air through a gas-liquid separator of the cooling tower or enter a temporary storage tank for continuous protection; under the protection of nitrogen, crude benzene gas generated by the temporary storage tank is introduced into the storage tank through a pressure control device, when the pressure in the storage tank is raised to a certain degree, a pressure sampling pipeline conveys mixed gas of the crude benzene gas and the nitrogen to a cooling tower through the pressure sampling device, the mixed gas is cooled to obtain crude benzene liquid, and the nitrogen can enter the temporary storage tank or be discharged through a nitrogen discharge port through a gas-liquid separator of the cooling tower; when the pressure sampling device can not sample, the pressure rises to the set safe pressure, and the pressure can be discharged through the breather valve, so that the safety protection is realized.

4. The process for the crude benzene gas treatment device in the gas production as claimed in claim 1, wherein when the crude benzene in the storage tank is discharged, the pressure in the tank body is reduced, firstly, the automatic pressure control device can automatically supplement nitrogen gas into the storage tank to achieve the safety pressure and achieve the purpose of nitrogen sealing, so that the first step of safety protection is realized, but when the automatic nitrogen charging is not realized, the safety protection can be realized by conveying the nitrogen gas through the pressure control device of the temporary storage tank; when the pressure in the tank body reaches the set negative pressure limit of the safety pressure and the nitrogen can not be supplemented, the breather valve can automatically open the supplementary air to reach the safety pressure of the tank body, and the third safety protection is completed.

5. The device for treating the crude benzene gas in the gas production as claimed in claim 1, wherein the storage tank is provided with more than one storage tank and is connected in series with the nitrogen gas conveying pipeline, and the storage tank is also connected in series with the pressure sampling pipeline.

6. The crude benzene gas treatment device for gas production according to claim 1, wherein the storage tank and the temporary storage tank are provided with a pressure alarm and/or a vent valve.

7. The crude benzene gas treatment device for gas production as claimed in claim 1, wherein the pressure sampling pipeline is used for periodically extracting the mixed gas of nitrogen and crude benzene gas on the liquid surface of the storage tank through the pressure sampling device and cooling the mixed gas through the cooling tower.

The technical field is as follows:

the invention relates to a recovery processing device and a processing method of chemical raw materials, in particular to a crude benzene gas processing technology and a crude benzene gas processing device in coal gas production.

Technical background:

benzene (Benzene, C)₆H₆) It is a colorless, sweet transparent liquid at normal temperature and has strong fragrance. Benzene is combustible and has high toxicity, and is a carcinogenic substance. Benzene can enter human body through skin and respiratory tract, and is extremely difficult to degrade in human body. Benzene is poorly soluble in water and readily soluble in organic solvents, and itself also acts as an organic solvent. Benzene is a petrochemical raw material with wide application, and along with the continuous improvement of the living consumption level of people, the benzene demand is larger and larger, and the problem of environmental pollution caused by benzene is more and more prominent.

In the coking production, coking coal is heated in a carbonization chamber, coke is formed by thermal decomposition and coking, and a large amount of volatile substances, i.e., raw coke gas, is removed. The raw gas has complex components, contains a plurality of chemical substances, and is extracted by corresponding chemical and physical methods to be very useful chemical process products, such as coal tar, ammonium sulfate, sulfuric acid, crude benzene and the like. Crude benzene is an important chemical raw material and is expensive due to its wide application. In the prior art, the main processes of crude benzene recovery from crude gas comprise crude gas cooling, benzene washing and benzene removal, namely, the crude gas generated by a coking chamber is discharged through a crude gas discharge pipe, and is cooled by a multistage heat exchanger, and then the cooled crude gas is sent into a benzene washing tower, and after being in countercurrent contact with washing oil sprayed in the benzene washing tower, benzene in the crude gas is fully absorbed by the washing oil, and rich oil generated after benzene washing is conveyed to the benzene removal tower through a pipeline to recover crude benzene. However, in the prior art, the collection of crude benzene gas and the storage of crude benzene do not have good collection systems and devices.

The invention content is as follows:

in order to overcome the defects of the prior art, the invention provides a crude benzene gas treatment process and a crude benzene gas treatment device in coal gas production. Realizes the treatment of crude benzene gas in the coal gas production and the treatment of crude benzene gas generated in the storage process.

The purpose of the invention is achieved by the following technical scheme:

a crude benzene gas treatment device used in gas production comprises an automatic pressure control device, a nitrogen conveying pipeline connected with the automatic pressure control device, a storage tank communicated with the nitrogen conveying pipeline and a pressure sampling pipeline and used for storing crude benzene, and a crude benzene temporary storage tank connected with the automatic pressure control device;

further, the crude benzene temporary storage tank is connected with the crude benzene storage tank through a crude benzene conveying pipeline, and the nitrogen conveying pipeline is connected with the crude benzene storage tank through an automatic pressure control device;

furthermore, the pressure sampling pipeline is connected with a supply pipeline of crude benzene gas and is connected with a cooling tower, and the pressure sampling pipeline is provided with a pressure sampling device;

further, the cooling tower is connected with the crude benzene temporary storage tank through a pipeline, so that crude benzene obtained by cooling is transferred to the crude benzene temporary storage tank;

further, the cooling tower is provided with a nitrogen gas discharge port;

furthermore, the automatic pressure control device comprises an automatic pressure controller, and a compressed gas input pipe and a nitrogen input pipe which are connected to the automatic pressure controller in parallel;

further, a pressure gauge, a breather valve of an oil-adding flame arrester and a crude benzene discharge valve are arranged on the crude benzene storage tank;

furthermore, the holding vessel be provided with more than one, and with nitrogen gas pipeline establish ties the setting, the holding vessel still with pressure sampling pipeline establish ties the setting.

Further, the holding vessel and the temporary storage tank can be provided with pressure alarms.

Furthermore, the pressure sampling pipeline periodically pumps the mixed gas of the nitrogen and the crude benzene gas on the liquid level of the storage tank through a pressure sampling device, and the mixed gas is cooled by a cooling tower.

The crude benzene gas treatment process for gas production comprises the following steps:

mode 1: conveying the crude benzene gas to a cooling tower through a pipeline, allowing the obtained crude benzene liquid to enter a temporary storage tank for temporary storage so as to separate out a water phase in the crude benzene liquid, volatilizing the crude benzene to generate new crude benzene gas, and introducing nitrogen into the temporary storage tank for protection through a pressure control device; when the crude benzene solution is transferred to the storage tank, the pressure of the temporary storage tank is reduced, and nitrogen can be supplemented into the temporary storage tank through the pressure control device, so that the pressure is ensured to be constant and stable; the nitrogen gas from the cooling tower can be discharged into the air through a gas-liquid separator of the cooling tower or enter a temporary storage tank for continuous protection; under the protection of nitrogen, crude benzene gas generated by the temporary storage tank is introduced into the storage tank through a pressure control device, when the pressure in the storage tank is raised to a certain degree, a pressure sampling pipeline conveys mixed gas of the crude benzene gas and the nitrogen to a cooling tower through the pressure sampling device, the mixed gas is cooled to obtain crude benzene liquid, and the nitrogen can enter the temporary storage tank or be discharged through a gas-liquid separator of the cooling tower; when the pressure sampling device can not sample, the pressure rises to the set safe pressure, and the pressure can be discharged through the breather valve, so that the safety protection is realized;

mode 2: when the crude benzene in the storage tank is discharged, the pressure in the tank body is reduced, firstly, the automatic pressure controller can automatically supplement nitrogen gas into the storage tank to achieve the safety pressure and achieve the purpose of nitrogen sealing, so that the first-step safety protection is realized, but when the nitrogen gas cannot be automatically filled, the nitrogen gas can be conveyed through the pressure control device of the temporary storage tank to realize the safety protection; when the pressure in the tank body reaches the set negative pressure limit of the safety pressure and the nitrogen can not be supplemented, the breather valve can automatically open the supplementary air to reach the safety pressure of the tank body, and the third safety protection is completed.

Furthermore, the holding vessel be provided with more than one, and with nitrogen gas pipeline establish ties the setting, the holding vessel still with pressure sampling pipeline establish ties the setting.

Furthermore, the storage tank and the temporary storage tank can be provided with a pressure alarm and/or an exhaust valve.

Furthermore, the pressure sampling pipeline periodically pumps the mixed gas of the nitrogen and the crude benzene gas on the liquid level of the storage tank through a pressure sampling device, and the mixed gas is cooled by a cooling tower.

The technical effects of the invention are mainly reflected in the following aspects: the technology of the invention adopts the automatic pressure control device to automatically adjust the internal pressure of the storage tank, so as to ensure the constant pressure in the storage tank, thereby achieving the safety purpose of nitrogen sealing of the storage tank; the gas generated in the gas production neutralization storage tank is cooled by a cooling tower, and crude benzene and nitrogen are recycled; and the production is automatically controlled under the safety guarantee, the integrated design of production and storage is realized, and the production cost is favorably reduced.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in order to make the technical solution of the present invention easier to understand and understand.

A crude benzene gas processing device used in coal gas production is disclosed, as shown in figure 1: the device comprises an automatic pressure control device 7-1, a nitrogen conveying pipeline 11 connected with the automatic pressure control device 7-1, a storage tank 1 communicated with the nitrogen conveying pipeline 11 and a pressure sampling pipeline 13 and used for storing crude benzene, and a crude benzene temporary storage tank 2 connected with the automatic pressure control devices 7-2 and 7-3;

the crude benzene temporary storage tank 2 is connected with the crude benzene storage tank 1 through a crude benzene conveying pipeline, and the nitrogen conveying pipeline is connected with the crude benzene storage tank 1 through an automatic pressure control device 7-3;

the pressure sampling pipeline 13 is connected with a supply pipeline 14 of crude benzene gas and is connected with the cooling tower 3, and the pressure sampling pipeline 13 is provided with a pressure sampling device 5;

the cooling tower 3 is connected with the crude benzene temporary storage tank 2 through a pipeline, so that crude benzene obtained by cooling is transferred to the crude benzene temporary storage tank;

the cooling tower is provided with a nitrogen gas discharge port 4;

the automatic pressure control device comprises an automatic pressure controller, and a compressed gas input pipe and a nitrogen input pipe which are connected into the automatic pressure controller in parallel;

a pressure gauge 6, a breather valve 9 of an oiling flame arrester and a crude benzene discharge valve 8 are arranged on the crude benzene storage tank;

a crude benzene gas treatment process used in coal gas production comprises the following steps:

mode 1: conveying the crude benzene gas to a cooling tower through a pipeline 14, temporarily storing the obtained crude benzene liquid in a temporary storage tank 2 so as to separate out a water phase in the crude benzene liquid, volatilizing the crude benzene to generate new crude benzene gas, and introducing nitrogen into the temporary storage tank for protection through a pressure control device 7-2; when the crude benzene solution is transferred to the storage tank 1, the pressure of the temporary storage tank 2 is reduced, and nitrogen can be supplemented into the temporary storage tank 2 through the pressure control device 7-2, so that the pressure is ensured to be constant and stable; as the crude benzene solution enters the storage tank 1, the liquid level rises, the pressure of the storage tank 1 rises, nitrogen and crude benzene gas in the storage tank 1 are conveyed to the cooling tower 3 through the pressure sampling pipeline 13 to be cooled to obtain the crude benzene solution, the pressure in the storage tank 1 is ensured to be constant, and the nitrogen from the cooling tower 3 can be discharged into the air through the nitrogen discharge port 4 through the gas-liquid separator of the cooling tower 3 or enter the temporary storage tank 2 for continuous protection; under the protection of nitrogen, crude benzene gas generated by the temporary storage tank 2 is introduced into the storage tank 1 through the pressure control device 7-3, when the pressure in the storage tank 1 is increased to a certain degree, the pressure sampling pipeline 13 conveys mixed gas of the crude benzene gas and nitrogen to the cooling tower 3 through the pressure sampling device 5, crude benzene liquid is obtained through cooling, and the nitrogen can enter the temporary storage tank 2 or be discharged through the nitrogen discharge port 4 through the gas-liquid separator of the cooling tower 3; when the pressure sampling device 5 cannot sample, the pressure rises to the set safe pressure, and the air can be discharged 9 through the breather valve, so that the safety protection is realized;

mode 2: when crude benzene in the storage tank 1 is discharged, the pressure in the tank body is reduced, firstly, the automatic pressure control device 7-1 can automatically supplement nitrogen into the storage tank 1 to achieve the safety pressure and achieve the purpose of nitrogen sealing, so that the first-step safety protection is realized, but when the nitrogen cannot be automatically charged, the pressure control devices 7-2 and 7-3 of the temporary storage tank 2 can convey the nitrogen to realize the safety protection; when the pressure in the tank body reaches the set negative pressure limit of the safety pressure and the nitrogen can not be supplemented, the breather valve 9 can automatically open the supplementary air to reach the safety pressure of the tank body, and the third safety protection is completed.

In this example, the nitrogen emission was tested to meet the emission standards set by the state.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.