CN214051050U

CN214051050U - Pressure swing adsorption tail gas recycle device

Info

Publication number: CN214051050U
Application number: CN202022672235.9U
Authority: CN
Inventors: 束剑峰; 戴辉; 许玉超; 王康; 练梅华; 李稀
Original assignee: Jiangsu Sugang Heshun Biotechnology Co ltd
Current assignee: Jiangsu Yancheng Port Yannong Circular Agriculture Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-27
Anticipated expiration: 2030-11-18

Abstract

The utility model relates to a pressure swing adsorption tail gas recycle device, the device utilize devices such as marsh gas collection gas cabinet, condenser, roots's fan, anaerobic jar and boiler utilization system, collect the tail gas after the pressure swing adsorption earlier, then mix with former marsh gas according to different proportions, utilize the system combustion gas mixture to water heating through the boiler to increase temperature to anaerobic jar. The utility model realizes the reutilization of tail gas after pressure swing adsorption, saves the self-production temperature-increasing methane volume of the anaerobic tank, and reduces the discharge amount of pollutants such as methane.

Description

Pressure swing adsorption tail gas recycle device

Technical Field

The utility model belongs to tail gas treatment equipment, concretely relates to pressure swing adsorption tail gas recycle device.

Background

With the change of rural production and life style, more and more agricultural wastes such as crop straws, livestock and poultry manure and the like are produced. The national advocates resource utilization according to the resource principle, agricultural wastes are valuable resources, can be used as fuels, fertilizers, feeds, industrial raw materials and the like after being treated, have great economic value, utilize the agricultural waste resources, not only can reduce the pollution to the environment, but also can improve the physical and chemical properties of soil, improve the soil fertility, improve the yield and the quality of agricultural products and increase the product competitiveness.

The biogas engineering can obtain biogas, biogas residues and biogas slurry by anaerobic fermentation of agricultural wastes, livestock and poultry manure and the like. The methane is used as renewable clean energy and has wide application. The utilization of biogas is generally in two ways: biogas power generation and biogas natural gas production, the following three treatment modes are mainly adopted at present in China: high-pressure water washing, pressure swing adsorption and membrane separation, and the three processes have respective advantages and disadvantages. For the pressure swing adsorption process, on one hand, the carbon dioxide gas discharged by the vacuum pump contains 10% of methane, and the methane is the main component of the methane and the natural gas, so that the conversion rate of the methane into the natural gas is 90%. On the other hand, the air is polluted along with the evacuation of the carbon dioxide, and meanwhile, the waste of effective energy is caused.

Disclosure of Invention

The invention aims to provide a pressure swing adsorption tail gas recycling device to solve the problems in the background.

In order to achieve the purpose, the invention provides the following technical scheme:

a pressure swing adsorption tail gas recycling device is characterized by comprising a tail gas recycling device, a methane supply device and a tail gas utilization device; the tail gas recovery device is formed by sequentially connecting a first condenser, a first methane gas collection cabinet, a second condenser and a first Roots blower capable of being controlled by variable frequency from left to right; the methane supply device is formed by sequentially connecting an anaerobic tank, a third condenser, a second methane gas collection cabinet, a fourth condenser and a variable-frequency controlled second Roots blower from left to right; the tail gas utilization device consists of a boiler utilization system; after the tail gas subjected to pressure swing adsorption sequentially passes through the first condenser, the first methane gas collection cabinet, the second condenser and the first Roots blower of the tail gas recovery device, the tail gas is communicated with the tail gas utilization device through a three-way connector, and the methane and the tail gas enter the boiler utilization system after being uniformly mixed, wherein the volume of the first methane gas collection cabinet is smaller than that of the second methane gas collection cabinet, and the maximum flow of the first Roots blower is smaller than that of the second Roots blower.

Further: the first biogas gas collection cabinet is a 1000-cubic-meter dual-mode dry gas cabinet.

Further: the maximum flow of the first Roots blower is 50 cubic meters per hour, and the variable frequency control is realized.

Further: the second biogas gas collection cabinet is a 2000 cubic meter double-mode dry gas cabinet.

Further: the maximum flow of the second Roots blower is 250 cubic meters per hour, and the variable frequency control is realized.

Further: the content of methane in the mixed gas of the tail gas and the methane is 50 percent.

Further: the content of methane in the mixed gas entering the boiler utilization system is more than 35%.

Further: the temperature of the anaerobic jar is kept at 38 ℃.

Further: for the self-heating of the anaerobic tank, the boiler utilization system needs to burn methane equivalent of 1500-2400 cubic meters/day.

Compared with the prior art, the invention has the beneficial effects that the gas with 10 percent of methane content discharged by the pressure swing adsorption process is fully utilized, the methane quantity required to be combusted for heating the normal anaerobic tank per se is reduced, about 50000 cubic meters of methane containing 60 percent of methane is saved every year, 30000 cubic meters of methane equivalent discharged into the atmosphere is reduced, and the purposes of saving energy, reducing emission and reducing production cost can be achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a cross-sectional view of a pressure swing adsorption tail gas recycling apparatus.

Wherein: the system comprises a tail gas recovery device-1, a biogas supply device-2, a tail gas utilization device-3, a first condenser 4, a first biogas gas collection cabinet-5, a second condenser-6, a first Roots blower-7, an anaerobic tank-8, a third condenser-9, a second biogas gas collection cabinet 10, a fourth condenser 11, a second Roots blower-12, a boiler utilization system-13 and a pressure swing adsorption-14.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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 following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but should not be construed as limiting the scope thereof.

As shown in fig. 1, the pressure swing adsorption tail gas recycling device of the present invention is characterized in that it comprises a tail gas recycling device 1, a biogas supply device 2 and a tail gas utilization device 3; the tail gas recovery device 1 is formed by sequentially connecting a first condenser 4, a 1000-cube dual-mode dry-type biogas gas collection cabinet 5, a second condenser 6 and a variable-frequency-controlled first Roots blower 7 with the maximum flow of 50 cubes/hour from left to right; the biogas supply device 2 is formed by sequentially connecting an anaerobic tank 8, a third condenser 9, a 2000-cube dual-mode dry biogas gas collecting cabinet 10, a fourth condenser 11 and a variable-frequency control second Roots blower 12 with the maximum flow rate of 250 cubes/hour from left to right; the tail gas utilization device 3 consists of a boiler utilization system 13; the tail gas after pressure swing adsorption sequentially passes through the first condenser 4, the methane gas collection cabinet 5, the second condenser 6 and the first roots blower 7 of the tail gas recovery device 1, and then is in fluid communication with the tail gas utilization device 3 through a three-way interface with methane sequentially passing through the anaerobic tank 8, the third condenser 9, the methane gas collection cabinet 10, the fourth condenser 11 and the second roots blower 12 of the methane supply device 2, and the methane and the tail gas are uniformly mixed and then enter the boiler utilization system 13.

Removing liquid water from the tail gas with the methane content of 10 percent after pressure swing adsorption every day through a condenser, and collecting the tail gas into a methane gas collection cabinet; meanwhile, 500 tons of raw materials are fed into the anaerobic tank every time for producing methane with the methane content of 60% through fermentation, and the methane is collected into a methane gas collection cabinet after water is removed through a condenser due to natural pressure; then 2 Roots blowers are started simultaneously, so that the tail gas and the methane are respectively dewatered again through a condenser, and are uniformly mixed before entering a boiler utilization system, wherein the content of the mixed gas methane is 50%; and then reasonably adjusting the air-fuel ratio of the boiler utilization system to ensure that the mixed gas is fully combusted, heating circulating water for heating the anaerobic tank, and ensuring that the temperature of the anaerobic tank is always kept at 38 ℃, thereby ensuring the gas production rate of the anaerobic tank.

Although the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable to the field of the invention, and further modifications may be readily made by those skilled in the art, and the invention is not limited to the details given herein, without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. A pressure swing adsorption tail gas recycling device is characterized by comprising a tail gas recycling device (1), a methane supply device (2) and a tail gas utilization device (3); the tail gas recovery device (1) is formed by sequentially connecting a first condenser (4), a first methane gas collection cabinet (5), a second condenser (6) and a first Roots blower (7) with variable frequency control from left to right; the methane supply device (2) is formed by sequentially connecting an anaerobic tank (8), a third condenser (9), a second methane gas collecting cabinet (10), a fourth condenser (11) and a variable-frequency control second Roots blower (12) from left to right; the tail gas utilization device (3) consists of a boiler utilization system (13); the tail gas after pressure swing adsorption sequentially passes through the first condenser (4), the first methane gas collection cabinet (5), the second condenser (6) and the first Roots blower (7) of the tail gas recovery device (1), and marsh gas which passes through an anaerobic tank (8), a third condenser (9), a second marsh gas collection cabinet (10), a fourth condenser (11) and a second Roots blower (12) of the marsh gas supply device (2) in sequence, is connected with the tail gas utilization device (3) through a three-way connector, the marsh gas passing through the second Roots blower (12) and the tail gas passing through the first Roots blower (7) are uniformly mixed and then enter the boiler utilization system (13), wherein the volume of the first marsh gas collecting cabinet (5) is smaller than that of the second marsh gas collecting cabinet (10), the maximum flow of the first Roots blower (7) is smaller than the maximum flow of the second Roots blower (12).

2. The pressure swing adsorption tail gas recycling device according to claim 1, wherein the first biogas gas collection tank (5) is a 1000 cubic meter dual-mode dry gas tank.

3. The pressure swing adsorption tail gas recycling device according to claim 1, characterized in that the maximum flow of the first roots blower (7) is 50 cubic meters per hour.

4. The pressure swing adsorption tail gas recycling device according to claim 1, wherein the second biogas gas collection tank (10) is a 2000 cubic meter dual-mode dry gas tank.

5. The pressure swing adsorption tail gas recycling device according to claim 1, characterized in that the maximum flow of the second roots blower (12) is 250 cubic meters per hour.

6. The pressure swing adsorption tail gas recycling device as claimed in claim 1, wherein the amount of tail gas after pressure swing adsorption is 700-1000 cubic meters, and the methane content is 10%.

7. The pressure swing adsorption tail gas recycling device according to claim 1, wherein the methane content in the biogas produced by the anaerobic tank (8) is 60%.

8. The pressure swing adsorption tail gas recycling device according to claim 1, wherein the methane content in the mixed gas of the biogas after passing through the second roots blower (12) and the tail gas after passing through the first roots blower (7) is 50%.

9. The pressure swing adsorption tail gas recycling device according to claim 1, wherein the content of methane in the mixed gas entering the boiler utilization system (13) is greater than 35%.

10. The pressure swing adsorption tail gas recycling device according to claim 1, characterized in that the temperature of the anaerobic tank (8) is kept at 38 ℃.