CN216143752U - Butadiene tail gas treatment process device of nitrile rubber synthesizer - Google Patents

Abstract

The utility model discloses a butadiene tail gas treatment process device of a nitrile rubber synthesis device, which comprises a chilled water cooler, wherein an organic tail gas inlet pipe is arranged on the chilled water cooler, the chilled water cooler is communicated with a gas-liquid separation tank through a pipeline, a gas-phase pipeline on the gas-liquid separation tank is communicated with a liquid nitrogen condensation pry block, a liquid-phase pipeline on the gas-liquid separation tank is communicated with a condensate recovery tank, organic waste gas condensed on the liquid nitrogen condensation pry block is communicated with a burner on an incinerator through a waste gas spray gun, a natural gas pipeline communicated with the burner is arranged on the burner, the incinerator is connected with air communicated with the burner, the air preheater is also connected with an economizer through a pipeline, and the economizer is communicated with a boiler steam pocket on the incinerator through a pipeline. The utility model has the functions of energy conservation, environmental protection, carbon emission reduction and carbon offset, and can recover butadiene.

Description

Butadiene tail gas treatment process device of nitrile rubber synthesizer

Technical Field

The utility model belongs to the technical field of nitrile rubber synthesis, and particularly relates to a butadiene tail gas treatment process device of a nitrile rubber synthesis device.

Background

The nitrile butadiene rubber synthesis production device in the chemical industry has large concentration and fluctuation of organic tail gas, and the organic tail gas mainly contains butadiene, nitrogen, trace water vapor, acrylonitrile and other C4 olefin organic matters. Because the conversion rate of the synthesis process is usually between 70 and 90 percent, the organic tail gas containing about 15 percent of butadiene by mass fraction is discharged in each kettle. Performing thin film processing on the butadiene powder according to the concentration quantification, wherein the concentration is equivalent to about 214000mg/m for butadiene, performing thin film processing according to oil gas recovery facility processing technology standard, performing thin film processing according to non-methane total hydrocarbon recovery method according to control indexes of 120mg/m, performing thin film processing according to petrochemical industry pollutant emission standard, or performing thin film processing according to other related industry standards, performing thin film processing according to the non-methane total hydrocarbon recovery method according to the above concentration quantification, performing thin film processing according to the above control indexes, performing thin film processing according to the above method, performing thin film processing according to the above method, and performing thin film processing according to the below method. Therefore, the traditional condensation recovery and diesel oil absorption method can not discharge the organic tail gas to reach the emission standard. And butadiene is easy to polymerize, and no particularly effective treatment method is available at present to achieve standard discharge.

The traditional butadiene organic tail gas treatment method mainly comprises a single condensation recovery process, a catalytic incineration process, a diesel oil absorption method and the like, the removal efficiency of the condensation method is generally 80-95%, and butadiene still has 10000mg/m and is difficult to achieve the standard due to the fact that the maximum 95% removal efficiency is considered. Butadiene is easy to polymerize, so that porous substances such as activated carbon, heat storage ceramic, a catalyst, a membrane material and the like have certain adsorptivity, and butadiene is adsorbed on porous pores to generate polymerization blockage, so that the system cannot normally operate for a long time. And the single diesel oil absorption method can not ensure that the butadiene tail gas reaches the standard and is discharged, and in addition, the mixture of the diesel oil and the butadiene must be recycled by a rectification purification method, otherwise, the waste of butadiene resources is caused.

Therefore, the butadiene tail gas treatment process device of the nitrile rubber synthesis device has the effects of energy conservation, environmental protection, carbon emission reduction and carbon offset, and can recover butadiene, and is used for solving the problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a butadiene tail gas treatment process device of a nitrile rubber synthesis device, which aims to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: a butadiene tail gas treatment process device of a nitrile rubber synthesis device, which comprises a chilled water cooler, the freezing water cooler is provided with an organic tail gas inlet pipe and is communicated with the gas-liquid separation tank through a pipeline, a gas phase pipeline on the gas-liquid separation tank is communicated with a liquid nitrogen condensation prying block, a liquid phase pipeline on the gas-liquid separation tank is communicated with a condensate recovery tank, the organic waste gas condensed on the liquid nitrogen condensation prying block is communicated with a burner on the incinerator through a waste gas spray gun, the combustor is provided with a natural gas pipeline communicated with the combustor, the incinerator is connected with an air preheater communicated with the combustor, the air preheater is connected with a combustion-supporting air pipe and is also connected with the economizer through a pipeline, the economizer is provided with a boiler water supply pipe and is communicated with a boiler steam drum on the incinerator through a pipeline.

Preferably, the chilled water cooler is provided with a chilled water return pipe and a chilled water inlet pipe.

Preferably, a condensate recycling pipeline is arranged on the condensate recycling tank to recycle the condensate.

Preferably, the boiler water supply pipe and the chilled water supply pipe are both provided with valves, the boiler water supply pipe is used for controlling the water supply quantity by using the valves, and the chilled water supply pipe is used for controlling the water inlet quantity by using the valves.

Preferably, the economizer is connected with an organic tail gas discharge pipe for discharging the treated tail gas.

The utility model has the technical effects and advantages that: according to the butadiene tail gas treatment process device of the nitrile butadiene rubber synthesis device, a liquid nitrogen condensation system is used for recovering butadiene, an incinerator process is used for meeting the standard emission of characteristic pollutant butadiene, condensation and the incineration process are optimally combined, a chilled water cooler is used for pretreatment, the butadiene tail gas treatment process device has the functions of energy conservation and environmental protection, carbon emission reduction and carbon offset, and can recover butadiene;

according to the utility model, the organic tail gas is pre-cooled by chilled water, so that high condensation point substances in the butadiene tail gas are removed, and the influence on tail gas concentration fluctuation caused by frequent switching due to frosting of a subsequent liquid nitrogen condensation system is avoided; the optimal condensation removal rate is selected through a condensation and incineration system, the concentration of the butadiene in the tail gas is controlled through adjusting the nitrogen content of the liquid, the highest recovery efficiency is achieved, and the organic tail gas is ensured to contain a certain heat value and enter the incinerator, so that the fuel is saved; the recovered butadiene contains trace moisture or acrylonitrile and other substances, but does not influence the nitrile butadiene rubber synthesis process, and can be directly recycled and produced by the process; the process has the advantages that waste gas is discharged up to the standard through incineration combination, waste heat can be recycled to produce steam, energy is saved, the environment is protected, and the purposes of carbon emission reduction and carbon neutralization are also achieved.

Drawings

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

In the figure: 1. an organic tail gas inlet pipe; 2. a chilled water cooler; 3. a gas-liquid separation tank; 4. liquid nitrogen condensation prying block; 5. a condensate recovery tank; 6. a condensate recycling pipeline; 7. a burner; 8. a natural gas pipeline; 9. an exhaust gas spray gun; 10. an incinerator; 11. an air preheater; 12. a coal economizer; 13. a boiler feed pipe; 14. a combustion air pipe; 15. a boiler drum; 16. a chilled water return pipe; 17. a chilled water supply pipe; 18. organic tail gas discharge pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model provides a butadiene tail gas treatment process device of a nitrile rubber synthesizer as shown in figure 1, which comprises a chilled water cooler 2, wherein the chilled water cooler 2 is provided with a chilled water return pipe 16 and a chilled water inlet pipe 17, the chilled water cooler 2 is provided with an organic tail gas inlet pipe 1, the chilled water cooler 2 is communicated with a gas-liquid separation tank 3 through a pipeline, a gas-phase pipeline on the gas-liquid separation tank 3 is communicated with a liquid nitrogen condensation pry block 4, a liquid-phase pipeline on the gas-liquid separation tank 3 is communicated with a condensate recovery tank 5, the condensate recovery tank 5 is provided with a condensate recycling pipeline 6, organic waste gas condensed on the liquid nitrogen condensation pry block 4 is communicated with a combustor 7 on an incinerator 10 through a waste gas spray gun 9, the combustor 7 is provided with a natural gas pipeline 8 communicated with the combustor 7, the incinerator 10 is connected with an air preheater 11 communicated with the combustor 7, the device is characterized in that a combustion-supporting air pipe 14 is connected to the air preheater 11, the air preheater 11 is further connected with an economizer 12 through a pipeline, a boiler water supply pipe 13 is arranged on the economizer 12, the economizer 12 is communicated with a boiler steam drum 15 on the incinerator 10 through a pipeline, valves are arranged on the boiler water supply pipe 13 and a chilled water inlet pipe 17, and an organic tail gas discharge pipe 18 is connected to the economizer 12.

According to the utility model, a chilled water cooler 2 is adopted to pre-cool organic butadiene tail gas to about 2 ℃, condensed water in the butadiene tail gas is removed, then a liquid nitrogen condensation pry block 4 (a three-level liquid nitrogen cooling system) is adopted to control the removal rate of the butadiene tail gas to about 90%, butadiene conversion condensate removed from a gas phase can be directly recycled and synthesized after being collected by a condensate tank, the residual butadiene content after condensation is about 20000mg/m, and the waste gas adiabatic temperature rise is about 700 ℃, so that a direct combustion furnace and waste heat boiler combination is adopted, according to the experience of combustion data, the hearth is maintained at more than 820 ℃, the retention time is more than 2S, the incineration efficiency of about 99.999 percent can be met, and the standard emission of butadiene is finally ensured;

the condensed organic waste gas enters the head of the combustor 7 of the incineration chamber through a waste gas spray gun 9, and natural gas pipelines 8 introduced into the combustor 7 maintain the head to be exposed to fire to ignite the organic waste gas, so that the temperature in the furnace is ensured to be above 820 ℃. In order to save fuel, the temperature of combustion air 14 is raised to about 300 ℃ by tail flue gas through an air preheater 11, and the air preheater adopts a plate heat exchanger. The burned flue gas stays in the incinerator 10 for more than 2s and then directly enters the rear-end fire tube boiler, the outlet flue gas preheats air, and then is discharged to the environment after being subjected to heat exchange with boiler feed water through the economizer 12.

The organic tail gas flow of the butadiene tail gas treatment process device is as follows:

organic tail gas enters a chilled water cooler 2 through an organic tail gas inlet pipe 1, is precooled to about 2 ℃ through the chilled water cooler 2, is subjected to liquid removal through a gas-liquid separation tank 3, then enters a liquid nitrogen condensation pry block 4 in a gas phase, butadiene in the organic tail gas is liquefied and recovered after being cooled to the designed temperature, the residual non-condensable organic tail gas is reheated and then is mixed with a certain proportion of combustion-supporting air through a waste gas spray gun 9 and then enters an incinerator 10, the burner 7 of the incinerator maintains the furnace long open fire through natural gas at the head of the incinerator to ensure the safe combustion of the organic waste gas, the flue gas of the incinerator stays for 2 seconds and then enters a waste heat boiler arranged at the rear part of the incinerator to produce steam, the outlet flue gas firstly passes through an air preheater 11 to preheat a combustion-supporting air pipe 14 and then passes through an economizer 12 to heat a boiler water supply pipe 13 and then is discharged into the environment, the boiler feed water is heated to a certain temperature through the economizer 12 and enters the boiler drum 15, and the middle and rear sections of the incinerator 10 exchange heat with the flue gas to generate steam.

Condensing: because the organic tail gas contains trace water vapor and the original rubber synthesis process step is also emulsion polymerization, the condensed liquids of the gas-liquid separation tank 3 and the liquid nitrogen condensation pry block 4 can be mixed and recycled and the synthesis process can be directly collected and recycled through the condensed liquid collection tank;

particularly, the use amount of liquid nitrogen of the condensation prying block is too much, so that the condensation temperature of organic tail gas is too low, the recovery rate of butadiene is improved, but the supplementary fuel of the subsequent incinerator 10 is increased, liquid nitrogen and natural gas are increased, energy is not saved, the use amount of liquid nitrogen is too little, the condensation temperature is low, the recovery rate is reduced, the temperature of the subsequent incinerator is increased, the incineration efficiency is further improved, even the removal rate exceeds 99.9999%, the retention time is prolonged, and energy is not saved, so that the optimal use amount of liquid nitrogen needs to be adjusted to balance the optimal treatment between the liquid nitrogen and the subsequent incinerator in the operation process.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims (5)

1. The utility model provides a butadiene tail gas treatment process units of nitrile rubber synthesizer, includes refrigerated water cooler (2), its characterized in that: the device is characterized in that an organic tail gas inlet pipe (1) is arranged on the freezing water cooler (2), the freezing water cooler (2) is communicated with a gas-liquid separation tank (3) through a pipeline, a gas-phase pipeline on the gas-liquid separation tank (3) is communicated with a liquid nitrogen condensation prying block (4), a liquid-phase pipeline on the gas-liquid separation tank (3) is communicated with a condensate recovery tank (5), organic waste gas condensed on the liquid nitrogen condensation prying block (4) is communicated with a burner (7) on an incinerator (10) through a waste gas spray gun (9), a natural gas pipeline (8) communicated with the burner is arranged on the burner (7), an air preheater (11) communicated with the burner (7) is connected on the incinerator (10), a combustion air pipe (14) is connected on the air preheater (11), and the air preheater (11) is also connected with a coal economizer (12) through a pipeline, the economizer (12) is provided with a boiler water feeding pipe (13), and the economizer (12) is communicated with a boiler steam drum (15) on the incinerator (10) through a pipeline.

2. The butadiene tail gas treatment process unit of the nitrile rubber synthesis device according to claim 1, wherein: the chilled water cooler (2) is provided with a chilled water return pipe (16) and a chilled water inlet pipe (17).

3. The butadiene tail gas treatment process unit of the nitrile rubber synthesis device according to claim 1, wherein: and a condensate recycling pipeline (6) is arranged on the condensate recycling tank (5).

4. The butadiene tail gas treatment process unit of the nitrile rubber synthesis device according to claim 2, wherein: valves are arranged on the boiler water supply pipe (13) and the chilled water inlet pipe (17).

5. The butadiene tail gas treatment process unit of the nitrile rubber synthesis device according to claim 1, wherein: the economizer (12) is connected with an organic tail gas discharge pipe (18).

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