A redundant design of air blast condensing tail gas recovery process device

Abstract

The utility model relates to a kind of blast condensing tail gas recovery process device with redundancy design in coal gas purification technical field, specifically related to including negative pressure coal gas pipeline, one end of negative pressure coal gas pipeline keeps communicating with eye valve, one end of eye valve keeps communicating with oxygen analyzer and coal gas pressure regulating valve, one end of coal gas pressure regulating valve keeps communicating with tail gas pressure gauge, one end of tail gas pressure gauge keeps communicating with redundancy pipeline valve, one end of tail gas pressure gauge keeps communicating with valve 1 and valve 2, tail end of valve 1 keeps communicating with two groups of tar storage tank by pipeline, the outside of tar storage tank keeps communicating with nitrogen pipeline, it is that the tail gas in positive pressure oxygen-free recovery blast condensing is recovered into negative pressure coal gas pipeline, tail gas pipeline and instrument redundancy design realize tail gas VOC realizes zero emission, in this system, for positive pressure recovery tail gas, this method can realize oxygen-free environment safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of coal gas purification technology, specifically to a blower condensate tail gas recovery process device with redundant design. Background Technology

[0002] In the field of coal gas purification, the vented waste gases generated by blower condensation are diverse in type, property, and source. Based on their respective characteristics, various treatment methods are employed. Currently, the commonly used tail gas treatment methods in the coking industry mainly include scrubbing and absorption, adsorption, combustion, and the introduction of a negative pressure coal gas system.

[0003] However, existing methods all have their own drawbacks. Washing and adsorption methods cannot completely absorb the large amount of VOCs present in the exhaust gas. Combustion methods can burn and decompose most of the VOCs, but cannot completely decompose them, and a small amount of VOCs are still emitted into the atmosphere. The negative pressure system recovery method can recover all VOCs into the coal gas, but it has huge safety risks. During negative pressure recovery, air can easily enter the exhaust gas, forming an explosive mixture that poses a huge safety hazard. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a blower condensate exhaust gas recovery process device with redundant design, which can effectively solve the problems in the existing technology.

[0005] Technical solution

[0006] This utility model provides a redundant design for a blower condensate tail gas recovery process device, including a negative pressure gas pipeline. One end of the negative pressure gas pipeline is connected to a manhole valve. One end of the manhole valve is connected to an oxygen analyzer and a gas pressure regulating valve. One end of the gas pressure regulating valve is connected to a tail gas pressure gauge. One end of the tail gas pressure gauge is connected to a redundant pipeline valve. One end of the tail gas pressure gauge is connected to valve 1 and valve 2. The tail end of valve 1 is connected to two sets of tar storage tanks via a pipeline. The outer side of the tar storage tank is connected to a nitrogen pipeline. One end of the nitrogen pipeline is connected to multiple sets of self-regulating valve orifice plates. The self-regulating valve orifice plates are connected to a residual ammonia water tank. The ends of the residual ammonia water tanks are all connected to steam purging pipelines and valves. One end of the steam purging pipelines and valves is connected to a mechanized ammonia water clarification tank. The ends of the steam purging pipelines and valves are connected to multiple sets of circulating ammonia water tanks.

[0007] Furthermore, the valve is provided in two sets, and the exhaust gas pressure gauge and pipeline are provided in multiple sets. A shut-off valve is provided on one side of the oxygen analyzer. One end of valve 1 is connected to valve 2, and valve 2 is connected to a set of exhaust gas pressure gauges.

[0008] Furthermore, the bottom end of the shut-off valve is connected to another set of manhole valves, and the top of each set of tar storage tanks is connected to a breather valve 1, a single breather valve, a relief valve, and an electronic pressure gauge.

[0009] Furthermore, one end of the orifice plate of each group of self-regulating valves is connected to the self-regulating valve, and the mechanized ammonia clarification tank is equipped with a clarification tank discharge gate valve, a tar residue tank, and a tar separator.

[0010] Furthermore, multiple sets of the mechanized ammonia clarification tanks are provided, and one end of the mechanized ammonia clarification tank is kept in communication with the circulating ammonia tank.

[0011] Furthermore, one end of the nitrogen pipeline is kept connected through multiple sets of circulating ammonia water tanks, and one end of the remaining ammonia water tank is kept connected to the intermediate tar tank, the air flotation tar remover 1 and the air flotation tar remover 2, and the intermediate tar tank, the air flotation tar remover 1 and the air flotation tar remover 2 are kept connected to valve 1.

[0012] Beneficial effects

[0013] This invention utilizes a positive-pressure oxygen-free recovery method to transfer the exhaust gas from the blower condenser to a negative-pressure gas pipeline. The redundant design of the exhaust gas pipeline and instruments achieves zero VOC emissions from the exhaust gas. This system uses positive-pressure exhaust gas recovery, and this method can achieve a safe and reliable oxygen-free environment. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural block diagram of the present invention.

[0016] The labels in the diagram represent: 1. Negative pressure gas pipeline; 2. Ore-operated valve; 3. Shut-off valve; 4. Oxygen analyzer; 5. Gas pressure regulating valve; 6. Tail gas pressure gauge; 7. Redundant pipeline valve; 8. Valve 1; 9. Valve 2; 10. Breathing valve; 11. Single breather valve; 12. Tar intermediate tank; 13. Air flotation tar remover 1; 14. Air flotation tar remover 2; 15. Residual ammonia water tank; 16. Self-regulating regulating valve; 17. Nitrogen pipeline; 18. Tar storage tank; 19. Clarifying tank discharge gate valve; 20. Tar residue tank; 21. Mechanized ammonia water clarifying tank; 22. Tar separator; 23. Relief valve; 24. Electronic pressure gauge; 25. Circulating ammonia water tank; 26. Self-regulating regulating valve, traffic valve, orifice plate; 27. Steam cleaning pipeline and valve. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] The present invention will be further described below with reference to the embodiments.

[0019] Example: A blower condensate exhaust gas recovery process device with redundant design, refer to the attached document. Figure 1 This includes a negative pressure gas pipeline 1, one end of which is connected to a manhole valve 2. One end of the manhole valve 2 is connected to an oxygen analyzer 4 and a gas pressure regulating valve 5. One end of the gas pressure regulating valve 5 is connected to a tail gas pressure gauge 6. One end of the tail gas pressure gauge 6 is connected to a redundant pipeline valve 7. One end of the tail gas pressure gauge 6 is connected to valves 18 and 29. The tail end of valve 18 is connected to two sets of tar storage tanks 18 via a pipeline. The outer side of the storage tank 18 is connected to the nitrogen pipeline 17. One end of the nitrogen pipeline 17 is connected to multiple sets of self-regulating valve orifice plates 26. The self-regulating valve orifice plates 26 are connected to the remaining ammonia tank 15. The ends of the remaining ammonia tank 15 are all connected to the steam cleaning pipeline and valve 27. One end of the steam cleaning pipeline and valve 27 is connected to the mechanized ammonia clarification tank 21. The ends of the steam cleaning pipeline and valve 27 are connected to multiple sets of circulating ammonia tanks 25.

[0020] Two sets of the valve 2 are provided, and multiple sets of the tail gas pressure gauge 6 and pipeline are provided. A shut-off valve 3 is provided on one side of the oxygen analyzer 4. One end of the valve 18 is connected to the valve 29, and the valve 29 is connected to a set of tail gas pressure gauges 6. The bottom end of the shut-off valve 3 is connected to another set of valve 2. The top of each set of tar storage tanks 18 is connected to a breather valve 110, a single breather valve 11, a relief valve 23, and an electronic pressure gauge 24. By installing safety electronic pressure gauges and various protective safety accessories on each storage tank in the blast condensation process and interlocking the oxygen analyzer with the shut-off valve, the tail gas in the storage tank of the blast condensation process is safely recovered into the gas pipeline under positive pressure and oxygen-free conditions, achieving zero tail gas emission.

[0021] One end of the orifice plate 26 of each group of self-regulating valves is connected to the self-regulating valve 16. The mechanized ammonia clarification tank 21 is equipped with a clarification tank discharge gate valve 19, a tar residue tank 20, and a tar separator 22. There are multiple groups of mechanized ammonia clarification tanks 21. One end of the mechanized ammonia clarification tank 21 is connected to the circulating ammonia tank 25. One end of the nitrogen pipeline 17 is connected to multiple groups of circulating ammonia tanks 25. One end of the remaining ammonia tank 15 is connected to the intermediate tar tank 12, the air flotation tar remover 113, and the air flotation tar remover 214. The intermediate tar tank 12, the air flotation tar remover 113, and the air flotation tar remover 214 are connected to the valve 18. Each storage tank is equipped with an electronic pressure gauge to monitor the pressure of each storage tank. Each storage tank is equipped with a single-exit valve, a breather valve, a relief valve, a self-regulating valve, and other safety accessories. A flame arrester is installed at the tail gas outlet of each storage tank.

[0022] The exhaust gas recovery system is divided into two redundant systems, each capable of handling 100% load. The two systems can serve as backups for each other, achieving redundancy and preventing direct exhaust gas emissions during cleaning, maintenance, or instrument replacement, thus achieving zero emissions. Each recovery system's exhaust gas pipeline is equipped with an oxygen analyzer and a shut-off valve interlocked with the oxygen content. An alarm is triggered when the oxygen content reaches 1.95%, and shut-off occurs at 2%. Each exhaust gas pipeline has three exhaust gas pressure displays: one interlocked with an automatic regulating valve, and two redundant displays for observing the overall pipeline resistance. When the resistance increases to 1.5-2.5 kPa or higher, steam purging is necessary. This redundant exhaust gas pipeline design ensures zero emissions.

[0023] In this device, the piping material is made of 304 stainless steel to improve the service life of the exhaust gas pipeline; various safety accessories provide graded protection for the safety of the storage tank system according to pressure, and zero VOC emissions are achieved through the redundant design of some exhaust gas pipelines and instruments.

[0024] Each exhaust gas recovery pipeline is equipped with a steam purging point at the end for online steam purging when resistance increases; each self-regulating valve is equipped with a nitrogen access valve and pipeline and a 5-20mm flow orifice plate for manual control of nitrogen supply during maintenance of the self-regulating valve.

[0025] In this device, the single exhalation valve operates at a pressure of 1000 Pa, the breathing valve operates at a pressure of -300 Pa (inhalation) and 1350 Pa (exhalation), the vent valve operates at a pressure of 1800 Pa (exhalation), the self-regulating valve starts working at a pressure of 200 Pa and stops working at 500 Pa, the working pressure of each storage tank is between 200-500 Pa, the oxygen analyzer alarm pressure value is 1.95%, and the shut-off is 2%, the shut-off valve is air-to-open, the nitrogen pipeline pressure is 0.5 MPa, the pipeline pressure gauge operates within the range of -2000-1800 Pa, the gas pressure regulating valve is air-to-open with an opening range of 0-100%, the tail gas pipeline diameter is 50-300 mm, the self-regulating traffic valve orifice plate diameter is 5-50 mm, and the steam cleaning pipeline and valve diameter is DN25-DN50.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A blower condensate exhaust gas recovery process device with redundant design, characterized in that, The system includes a negative pressure gas pipeline (1), one end of which is connected to a manhole valve (2), one end of which is connected to an oxygen analyzer (4) and a gas pressure regulating valve (5), one end of which is connected to a tail gas pressure gauge (6), one end of which is connected to a redundant pipeline valve (7), one end of which is connected to valve 1 (8) and valve 2 (9), and the tail end of valve 1 (8) is connected to two sets of tar storage tanks (18) via a pipeline. The outer side of the tar storage tank (18) is connected to the nitrogen pipeline (17). One end of the nitrogen pipeline (17) is connected to multiple sets of self-regulating valve orifice plates (26). The self-regulating valve orifice plates (26) are connected to the remaining ammonia tank (15). The ends of the remaining ammonia tank (15) are all connected to the steam cleaning pipeline and valve (27). One end of the steam cleaning pipeline and valve (27) is connected to the mechanized ammonia clarification tank (21). The ends of the steam cleaning pipeline and valve (27) are connected to multiple sets of circulating ammonia tanks (25).

2. The blower condensate tail gas recovery process device with redundant design according to claim 1, characterized in that, The valve (2) is provided in two sets, and the tail gas pressure gauge (6) and the pipeline are provided in multiple sets. The oxygen analyzer (4) is provided with a shut-off valve (3) on one side. One end of the valve 1 (8) is connected to the valve 2 (9). The valve 2 (9) is connected to a set of tail gas pressure gauges (6).

3. The blower condensate tail gas recovery process device with redundant design according to claim 2, characterized in that, The bottom end of the shut-off valve (3) is connected to another set of eye valves (2), and the top of each set of tar storage tanks (18) is connected to a breather valve 1 (10), a single breather valve (11), a relief valve (23) and an electronic pressure gauge (24).

4. The blower condensate tail gas recovery process device with redundant design according to claim 1, characterized in that, One end of the orifice plate (26) of each group of self-regulating valves is connected to the self-regulating valve (16). The mechanized ammonia clarification tank (21) is equipped with a clarification tank discharge gate valve (19), a tar residue tank (20) and a tar separator (22).

5. The blower condensate tail gas recovery process device with redundant design according to claim 4, characterized in that, The mechanized ammonia clarification tank (21) is provided in multiple sets, and one end of the mechanized ammonia clarification tank (21) is kept in communication with the circulating ammonia tank (25).

6. The blower condensate tail gas recovery process device with redundant design according to claim 1, characterized in that, One end of the nitrogen pipeline (17) is connected to multiple sets of circulating ammonia water tanks (25), and one end of the remaining ammonia water tank (15) is connected to the tar intermediate tank (12), the air flotation tar remover 1 (13) and the air flotation tar remover 2 (14). The tar intermediate tank (12), the air flotation tar remover 1 (13) and the air flotation tar remover 2 (14) are connected to the valve 1 (8).

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