CN216744380U

CN216744380U - Collection and processing apparatus of torch gas

Info

Publication number: CN216744380U
Application number: CN202123349729.4U
Authority: CN
Inventors: 周飞; 陈航; 胡挺
Original assignee: Hubei Yunhuaan Chemical Co ltd
Current assignee: Hubei Yunhuaan Chemical Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-06-14
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a collection and processing apparatus of torch gas belongs to synthetic ammonia technical field. The device comprises a torch, a cold box pipeline, a cold flame torch gas collecting pipeline, a normal temperature torch gas collecting pipeline, a heat exchanger, a buffer tank, a nitrogen supply structure and a spray heating structure, wherein the initial end of the cold box pipeline, the initial end of the cold flame torch gas collecting pipeline and the initial end of the normal temperature torch gas collecting pipeline are connected with the nitrogen supply structure; the spray heating structure is positioned right below the horizontal tank, is connected with the low-pressure steam pipe network, and sprays steam to the bottom of the horizontal tank.

Description

Collection and processing apparatus of torch gas

Technical Field

The utility model belongs to the technical field of medical dressing, in particular to collection and processing apparatus of torch gas.

Background

In the development of ammonia synthesis technology, research is mainly focused on reducing energy consumption and improving energy efficiency. At present, a large number of medium and small ammonia synthesis devices are in operation in China. The technological process of the ammonia synthesizing device mainly comprises raw material gas compression, raw material gas desulfurization, first-stage furnace conversion, second-stage furnace conversion, CO conversion₂Absorption, methanation, synthesis gas drying, synthesis gas compression, ammonia synthesis, freezing and other working sections. The cryogenic purification process is to extract the synthesis gas compressed by the synthesis gas, take out methane and excessive argon in the synthesis gas through the cryogenic purification process (usually adopting a liquid nitrogen cold washing box), and return purified nitrogen and hydrogen to the synthesis gas compressor.

Because the pretreated raw material gas contains a small amount of methane and argon which do not participate in the reaction in the ammonia synthesis reaction, more and more methane and argon are accumulated, which has adverse effects on the balance, progress and energy consumption of the reaction. Therefore, when methane and argon are accumulated to a certain concentration, the reaction gas is discharged (output to a torch for combustion).

In addition, normal temperature flare gas (such as exhaust gas of a liquid ammonia storage tank), low temperature flare gas (such as non-condensable gas obtained by an ammonia separator) and the like are generated in the process of synthesizing ammonia.

Therefore, the liquid nitrogen washing and cooling box, the normal-temperature torch gas and the low-temperature torch gas are all required to be sent to the torch for combustion treatment; however, the temperature of each flare gas is different, and the flare gas with lower temperature needs to be heated up to be sent to the flare for use.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the embodiment of the utility model provides a collection and processing apparatus of torch gas divides three pipelines to collect the torch gas, and normal atmospheric temperature torch gas directly sends to the torch, and cold torch gas sends to the torch after the heat exchanger heating, and the liquid nitrogen washes the row of cold box useless (the temperature is lower, cushions earlier and heaies up, carries out the heat transfer again, and the temperature is very low, if directly send to the heat exchanger, the heat exchanger quench can reduce life) and send to the torch after buffering and the heat transfer, has guaranteed the normal use of torch. The technical scheme is as follows:

the embodiment of the utility model provides a collection and processing apparatus of torch gas, the apparatus includes torch, cold box pipeline 1, cold fire torch gas collecting pipeline 2, normal atmospheric temperature torch gas collecting pipeline 3, heat exchanger 4, buffer tank 5, nitrogen gas supply structure and spray heating structure 6, the top of cold box pipeline 1, the top of cold fire torch gas collecting pipeline 2 and the top of normal atmospheric temperature torch gas collecting pipeline 3 all are connected with nitrogen gas supply structure, the end of cold box pipeline 1 is connected with buffer tank 5, the waste outlet of liquid nitrogen washing cold box 7 is connected with cold box pipeline 1, buffer tank 5 is connected with the cold air import of heat exchanger 4 through first pipeline 8, cold fire torch gas collecting pipeline 2 is used for collecting cold torch gas and its end is connected with first pipeline 8, the hot gas export of heat exchanger 4 is connected with the torch through second pipeline 9, normal atmospheric temperature torch gas collecting pipeline 3 is used for collecting torch gas and its end is connected with second pipeline 9, the hot gas inlet of the heat exchanger 4 is connected with a low-pressure steam pipe network of a synthetic ammonia production system; the buffer tank 5 comprises a horizontal tank 10 arranged in the front-back direction and two supporting bases 11 arranged in parallel in the front-back direction at the bottom of the horizontal tank; the spray heating structure 6 is located right below the horizontal tank 10, is located between two supporting bases 11, is connected with a low-pressure steam pipe network, and sprays steam to the bottom of the horizontal tank 10.

Specifically, the embodiment of the utility model provides an end and the top of horizontal tank 10 of cold box pipeline 1 are connected, the both ends of first pipeline 8 respectively with the top of horizontal tank 10 and the air conditioning access connection of heat exchanger 4 bottom, the top of heat exchanger 4 is located to the steam outlet.

Preferably, an inverted U-shaped tube 12 is arranged below the heat exchanger 4 in the embodiment of the present invention; the bottom of the inverted U-shaped pipe 12 is provided with a drain valve, one end of the drain valve is connected with a cold air inlet, and the other end of the drain valve is connected with the tail end of the cold torch gas collecting pipeline 2 and the first pipeline 8.

Wherein, the spray heating structure 6 in the embodiment of the present invention comprises a plurality of spray pipes 13; the plurality of spray pipes 13 are arranged in the front-back direction, are located below the horizontal tank 10, are connected with the low-pressure steam pipe network, are in circular arc arrangement matched with the horizontal tank 10, and are provided with a plurality of spray holes in parallel in the front-back direction towards one side of the horizontal tank 10.

Further, the spray heating structure 6 in the embodiment of the present invention further includes an arc main pipe 14, an arc fixing rod 15 and four supporting legs 16, wherein the arc main pipe 14 and the arc fixing rod 15 are both coaxial with the horizontal tank 10, and the supporting legs 16 are vertically arranged; the front end or the rear end of the spray pipe 13 is closed and is fixed on the arc-shaped fixing rod 15, and the other end of the spray pipe is fixed on the arc-shaped main pipe 14 and is communicated with the arc-shaped main pipe 14; two landing legs 16 are arranged side by side about the downside of arc house steward 14, be equipped with two other landing legs 16 side by side about the downside of arc dead lever 15, four landing legs 16 are the rectangle and arrange, the left end and/or the right-hand member of arc house steward 14 pass through the hose and are connected with the low pressure steam pipe network.

Specifically, the distance between the spray pipe 13 and the horizontal tank 10 in the embodiment of the present invention is 4-8cm, and the distance between the uppermost spray pipe 13 and the bottom end of the horizontal tank 10 is 6-15 cm.

Specifically, the volume of the buffer tank 5 in the embodiment of the utility model is 6-15 cubic, the design pressure is 0.6Mpa, and the design temperature is-196-65 ℃.

Further, the utility model discloses the embodiment of the utility model provides an in the front end or the rear end of buffer tank 5 be equipped with the pressure gauge, its other end is equipped with the blind plate that can open.

Wherein, the nitrogen gas supply structure in the embodiment of the utility model is positioned in the air separation section of the synthetic ammonia production system and is used for providing 0.3-0.6Mpa of normal temperature nitrogen gas, and the heat exchanger 4 is a horizontal tubular heat exchanger.

The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the embodiment of the utility model provides a collection and processing apparatus of torch gas divides three pipelines to collect the torch gas, and normal atmospheric temperature torch gas directly delivers to the torch, and cold torch gas delivers to the torch after the heat exchanger heating, and the liquid nitrogen washes the row's of cold box useless (the temperature is lower, cushions earlier and heaies up, carries out the heat transfer again, and the temperature is very low, if directly deliver to the heat exchanger, the heat exchanger quench can reduce life) and deliver to the torch after buffering and the heat transfer, has guaranteed the normal use of torch. In addition, the spray heating structure is designed to perform auxiliary heating on the buffer tank (the buffer tank is a special tank body and is not directly heated well), and meanwhile, the water in the buffer tank (such as leakage of a heat exchanger and condensation of water vapor in the buffer tank) is prevented from freezing to influence the service life of the buffer tank. Specifically, the effect of the buffer tank of this patent has a plurality ofly: firstly, gas is heated (directly exchanges heat with air); secondly, the heat exchanger is separated from the liquid nitrogen washing and cooling box, so that water vapor and the like can be reduced to enter the liquid nitrogen washing and cooling box; thirdly, the stability of the air flow is ensured, and the liquid nitrogen washing and cooling box usually discharges waste intermittently; fourthly, the liquid is gasified.

Drawings

FIG. 1 is a schematic block diagram of a flare gas collecting and treating device provided by an embodiment of the present invention;

FIG. 2 is a schematic view of a part of the structure of a flare gas collecting and treating device provided by an embodiment of the present invention;

fig. 3 is a schematic view of the combination of the buffer tank and the spray heating structure.

In the figure: 1 cold box pipeline, 2 cold torch gas collection pipelines, 3 normal atmospheric temperature torch gas collection pipelines, 4 heat exchangers, 5 buffer tanks, 6 spray heating structures, 7 liquid nitrogen wash cold boxes, 8 first pipelines, 9 second pipelines, 10 horizontal tanks, 11 supporting bases, 12 inverted U-shaped pipes, 13 spray pipes, 14 arc main pipes, 15 arc fixing rods and 16 supporting legs.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-3, the embodiment of the present invention provides a collection and treatment device for flare gas, which comprises a flare, a cold box pipeline 1, a cold flare gas collection pipeline 2, a normal temperature flare gas collection pipeline 3, a heat exchanger 4, a buffer tank 5, a nitrogen supply structure (for providing nitrogen, taking away various flare gases through the flow of nitrogen, burning at the flare), a spray heating structure 6, and the like. Wherein, the beginning of the cold box pipeline 1, the beginning of the cold torch gas collecting pipeline 2 and the beginning of the normal temperature torch gas collecting pipeline 3 are all connected with the nitrogen gas supply structure, and the end of the cold box pipeline 1 is connected with the buffer tank 5 (if the liquid nitrogen washes the cold box 7 and outputs liquid, the high liquid level of the liquid nitrogen washing the cold box 7 gives the pressure of the flowing liquid, at this moment, the valve between the pipeline and the nitrogen gas supply structure can be closed to avoid the liquid to enter the nitrogen gas supply structure, and the valve is opened after the liquid discharge is completed). The waste outlet(s) of the liquid nitrogen washing cold box 7 are connected with the cold box pipeline 1, the buffer tank 5 is connected with the cold air inlet of the heat exchanger 4 through a first pipeline 8, the cold torch gas collecting pipeline 2 (such as being connected with an ammonia separator and the like through pipelines) is used for collecting cold torch gas, the tail end of the cold torch gas is connected with the first pipeline 8, and the hot gas outlet of the heat exchanger 4 is connected with a torch through a second pipeline 9. The normal temperature flare gas collecting pipeline 3 (such as being connected with an exhaust port of an ammonia tank and the like through a pipeline) is used for collecting normal temperature flare gas, the tail end of the normal temperature flare gas is connected with the second pipeline 9, a hot gas inlet of the heat exchanger 4 is connected with a low-pressure steam pipe network of a synthetic ammonia production system, and a condensed water outlet of the heat exchanger 4 is connected with a corresponding condensed water output pipeline. The buffer tank 5 includes a horizontal tank 10 disposed in a front-back direction (for convenience of description, the horizontal tank 10 is defined as being disposed in the front-back direction, but not limited to this patent), two support bases 11 disposed in a front-back side-by-side manner at the bottom thereof (disposed in a left-right direction, and the two support bases 11 are respectively located at the front and the rear of the horizontal tank 10), and the like. The spray heating structure 6 is located right below the horizontal tank 10, located between the two support bases 11, and connected with a low-pressure steam pipe network, and sprays steam to the bottom of the horizontal tank 10, and the spray heating structure is turned on (for example, when the temperature of gas output to the heat exchanger 4 is low or the heat exchanger 4 leaks) or turned off (normally turned off) as required.

Specifically, referring to fig. 2, the end of the cooling box pipeline 1 in the embodiment of the present invention is connected to the top of the horizontal tank 10, the two ends of the first pipeline 8 are respectively connected to the top of the horizontal tank 10 and the cool air inlet at the bottom of the heat exchanger 4, and the hot air outlet is disposed at the top of the heat exchanger 4.

Preferably, referring to fig. 2, an inverted U-shaped pipe 12 is provided below the heat exchanger 4 in the embodiment of the present invention to reduce the water vapor from entering the buffer tank 5. The bottom of the inverted U-shaped pipe 12 is provided with a drain valve (normally closed, open when there is water accumulated in the bottom of the inverted U-shaped pipe 12), one end of which is connected with the cold air inlet, and the other end of which is connected with the end of the cold flame torch gas collecting pipeline 2 and the end of the first pipeline 8.

Referring to fig. 2-3, the spray heating structure 6 of the present invention includes a plurality (typically greater than 4) of spray tubes 13. The plurality of spray pipes 13 are arranged in the front-back direction (the spray pipes 13 are parallel to the horizontal tank 10), are located below the horizontal tank 10, are connected with a low-pressure steam pipe network (the low-pressure steam pipe network can also be connected with a medium-pressure steam pipe network (for standby use when the low-pressure steam pipe network cannot normally work) of the synthetic ammonia production system), are arranged in a circular arc shape (concentric with the horizontal tank 10) matched with the horizontal tank 10, and are provided with a plurality of spray holes (specifically, circular holes) in parallel in the front and at the back of one side of the horizontal tank 10. The plurality of spray holes on the spray heating structure 6 are uniformly distributed to ensure that the bottom of the horizontal tank 10 can be uniformly heated.

Further, referring to fig. 2-3, the spray heating structure 6 in the embodiment of the present invention further includes an arc main pipe 14, an arc fixing rod 15, four supporting legs 16, and the like, wherein the arc main pipe 14 and the arc fixing rod 15 are all coaxially disposed with the horizontal tank 10, the arc main pipe 14 and the arc fixing rod 15 are disposed side by side in front of and behind each other and have the same shape, and the supporting legs 16 are vertically disposed. The front or rear end of the spray pipe 13 is closed and fixed on the arc fixing rod 15, and the other end thereof is fixed on the arc main pipe 14 and communicated with the arc main pipe 14. Two landing legs 16 are equipped with side by side about arc house steward 14's the downside, are equipped with two other landing legs 16 side by side about the downside of arc dead lever 15, and four landing legs 16 are the rectangle and arrange, and arc house steward 14's left end and/or right-hand member (do not seal with the one end of hose connection, preferred both ends all are connected with the low pressure steam pipe network) pass through the hose (its junction with the low pressure steam pipe network can set up the valve) and be connected with the low pressure steam pipe network.

Specifically, the volume of the buffer tank 5 in the embodiment of the present invention is 6-15 cubic, the design pressure is 0.6Mpa, the design temperature is-196-65 ℃, the permission level is a2, the material is S30408, and the container category is class ii, which can be provided by the tay cryogenic technology corporation in hangzhou (the liquid nitrogen cold washing box 7 can also be from the corporation).

Further, the utility model discloses the embodiment of the utility model provides an in the front end or the rear end of buffer tank 5 be equipped with the pressure gauge, its other end is equipped with the blind plate that can open, is equipped with the ground connection row (setting along supporting basis 11) between its bottom and the ground.

Wherein, the embodiment of the utility model provides a nitrogen gas supply structure is located the air separation workshop section of synthetic ammonia production system and is used for providing 0.3-0.6 Mpa's normal atmospheric temperature nitrogen gas (specifically can be 0.4 Mpa's low pressure normal atmospheric temperature nitrogen gas), and nitrogen gas supply structure is the conventional structure in the synthetic ammonia production system. The heat exchanger 4 is a horizontal tubular heat exchanger. Specifically, the design pressure of the tube side of the heat exchanger 4 is 1.0Mpa, the design temperature is 280 ℃, the working medium is steam, and the material is S30408; the shell side design pressure of the heat exchanger 4 is 0.6Mpa, the design temperature is-196-190 ℃, the working medium is torch gas and the material is S30408; the heat exchange area of the heat exchanger 4 is more than 80 square meters, and the permission grades are A1 and A2.

In the embodiment, valves or flowmeters and the like are arranged on pipelines between the structures according to needs; in this embodiment, "first" and "second" only have a distinguishing function, and have no other special meaning.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The collection and treatment device of flare gas comprises a flare; the device is characterized by further comprising a cold box pipeline (1), a cold torch gas collecting pipeline (2), a normal-temperature torch gas collecting pipeline (3), a heat exchanger (4), a buffer tank (5), a nitrogen supply structure and a spray heating structure (6), wherein the starting end of the cold box pipeline (1), the starting end of the cold torch gas collecting pipeline (2) and the starting end of the normal-temperature torch gas collecting pipeline (3) are connected with the nitrogen supply structure, the tail end of the cold box pipeline (1) is connected with the buffer tank (5), a waste outlet of a liquid nitrogen washing and cooling box (7) is connected with the cold box pipeline (1), the buffer tank (5) is connected with a cold air inlet of the heat exchanger (4) through a first pipeline (8), the cold torch gas collecting pipeline (2) is used for collecting cold torch gas, the tail end of the cold torch gas is connected with the first pipeline (8), a hot air outlet of the heat exchanger (4) is connected with a torch through a second pipeline (9), the normal-temperature flare gas collecting pipeline (3) is used for collecting normal-temperature flare gas, the tail end of the normal-temperature flare gas collecting pipeline is connected with the second pipeline (9), and a hot gas inlet of the heat exchanger (4) is connected with a low-pressure steam pipe network of a synthetic ammonia production system; the buffer tank (5) comprises a horizontal tank (10) arranged in the front-back direction and two supporting bases (11) arranged in parallel in the front-back direction at the bottom of the horizontal tank; the spray heating structure (6) is located right below the horizontal tank (10), is located between the two supporting bases (11), is connected with the low-pressure steam pipe network, and sprays steam to the bottom of the horizontal tank (10).

2. The collection and treatment device of flare gas as claimed in claim 1, wherein the end of the cold box pipeline (1) is connected with the top of the horizontal tank (10), the two ends of the first pipeline (8) are respectively connected with the cold gas inlet at the top of the horizontal tank (10) and the cold gas inlet at the bottom of the heat exchanger (4), and the hot gas outlet is arranged at the top of the heat exchanger (4).

3. The collection and treatment device of flare gas according to claim 2, wherein an inverted U-shaped pipe (12) is arranged below the heat exchanger (4); the bottom of the inverted U-shaped pipe (12) is provided with a drain valve, one end of the drain valve is connected with a cold air inlet, and the other end of the drain valve is connected with the tail end of the cold torch gas collecting pipeline (2) and the first pipeline (8).

4. The collection and treatment device of flare gas according to claim 1, wherein the spray heating structure (6) comprises a plurality of spray tubes (13); the plurality of spray pipes (13) are arranged in the front-back direction, are positioned below the horizontal tank (10), are connected with the low-pressure steam pipe network, are in circular arc arrangement matched with the horizontal tank (10), and are provided with a plurality of spray holes in parallel in the front and at the back of one side facing the horizontal tank (10).

5. The flare gas collecting and treating device as claimed in claim 4, wherein the spray heating structure (6) further comprises an arc-shaped main pipe (14), an arc-shaped fixing rod (15) and four legs (16), the arc-shaped main pipe (14) and the arc-shaped fixing rod (15) are coaxially arranged with the horizontal tank (10), and the legs (16) are vertically arranged; the front end or the rear end of the spray pipe (13) is closed and is fixed on the arc-shaped fixing rod (15), and the other end of the spray pipe is fixed on the arc-shaped main pipe (14) and is communicated with the arc-shaped main pipe (14); the utility model discloses a low pressure steam pipe network, including arc house steward (14), be equipped with two landing legs (16) side by side about the downside of arc house steward (14), be equipped with two other landing legs (16) side by side about the downside of arc dead lever (15), four landing legs (16) are the rectangle and arrange, the left end and/or the right-hand member of arc house steward (14) pass through the hose and are connected with the low pressure steam pipe network.

6. A flare gas collecting and treating device according to claim 4, wherein the distance between the spray pipe (13) and the horizontal tank (10) is 4-8cm, and the distance between the uppermost spray pipe (13) and the bottom end of the horizontal tank (10) is 6-15 cm.

7. The collection and treatment device of flare gas as defined in claim 1, wherein the volume of the buffer tank (5) is 6-15 cubic, the design pressure is 0.6Mpa, and the design temperature is-196-65 ℃.

8. The collection and treatment device of flare gas according to claim 1, wherein the front end or the rear end of the buffer tank (5) is provided with a pressure gauge, and the other end thereof is provided with an openable blind plate.

9. The collection and treatment device of flare gas according to claim 1, wherein the nitrogen supply structure is located in an air separation section of a synthetic ammonia production system for providing normal temperature nitrogen of 0.3-0.6Mpa, and the heat exchanger (4) is a horizontal tubular heat exchanger.