CN216191074U - Hydrogen recovery device in synthetic ammonia purge gas - Google Patents
Hydrogen recovery device in synthetic ammonia purge gas Download PDFInfo
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- CN216191074U CN216191074U CN202123077764.5U CN202123077764U CN216191074U CN 216191074 U CN216191074 U CN 216191074U CN 202123077764 U CN202123077764 U CN 202123077764U CN 216191074 U CN216191074 U CN 216191074U
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Abstract
The utility model belongs to the technical field of purge gas recovery, and particularly relates to a recovery device for hydrogen in purge gas of synthetic ammonia, which comprises an ammonia washing tower, wherein the exhaust end of the ammonia washing tower is connected with a hydrogen recovery mechanism, the liquid discharge end of the ammonia washing tower is connected with the ammonia recovery mechanism through a pipeline, the hydrogen recovery mechanism comprises a drying device for drying the purge gas, the air inlet end of the drying device is connected with the exhaust end of the ammonia washing tower through a pipeline, the exhaust end of the drying device is connected with a hydrogen adsorption device through a pipeline, the waste gas discharge end of the hydrogen adsorption device is connected with a fuel gas pipe network through a pipeline, a plurality of layers of hydrogen absorption material layers are sequentially arranged in the hydrogen adsorption device from top to bottom, and reversible hydrogen absorption materials are arranged in the hydrogen absorption material layers. The ammonia washing tower is simple in structure and convenient to operate, ammonia in the purge gas is removed through the ammonia washing tower, the ammonia in the cleaning liquid is recovered through the ammonia recovery mechanism, the purge gas is recovered through the hydrogen recovery mechanism, and pure hydrogen can be obtained.
Description
Technical Field
The utility model belongs to the technical field of purge gas recovery, and particularly relates to a recovery device for hydrogen in a synthetic ammonia purge gas.
Background
The existing hydrogen-ammonia recovery process of purge gas of synthetic ammonia comprises the steps of respectively washing ammonia from the purge gas by using a high-pressure ammonia washing tower, washing ammonia from ammonia flash steam from a liquid ammonia storage tank, a liquid ammonia discharge tank and a liquid ammonia spherical tank by using a low-pressure ammonia washing tower, removing water mist from the purge gas after ammonia washing by using a precision filter, then entering a preheater, and finally entering an H2/N2 membrane separator, wherein hydrogen separated by the H2/N2 membrane separator is sent to a compression system, and nitrogen-hydrogen mixed gas which is not completely separated is sent to a fuel pipe network. The concentration of the dilute ammonia water from the high-pressure ammonia washing tower is 7-9%, the concentration of the dilute ammonia water from the low-pressure ammonia washing tower is about 10%, and the dilute ammonia water has too low concentration and cannot be sold directly. The existing method is that dilute ammonia water coming out of a high-pressure ammonia washing tower and dilute ammonia water coming out of a low-pressure ammonia washing tower are sent into an ammonia distillation system together to be distilled and recycled, the recycled liquid ammonia is sent to a storage tank, a large amount of steam needs to be consumed, the operation cost is high, energy conservation and emission reduction are not facilitated, and pure hydrogen cannot be obtained during hydrogen recycling.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model provides a recovery unit of hydrogen in synthetic ammonia purge gas, includes washes the ammonia tower, wash the exhaust end of ammonia tower and be connected with hydrogen recovery mechanism, and wash the flowing back end of ammonia tower and pass through the pipe connection and have ammonia recovery mechanism.
The hydrogen recovery mechanism is including being used for carrying out dry drying device to the speed gassing, drying device's inlet end is connected with the exhaust end of washing the ammonia tower through the pipeline, and drying device's exhaust end has hydrogen adsorption equipment through the pipe connection, hydrogen adsorption equipment's exhaust end has the fuel gas pipe network through the pipe connection, and is equipped with the multilayer in the hydrogen adsorption equipment from last to down in proper order and inhales the hydrogen material layer, it inhales the hydrogen material to be equipped with the reversibility in the hydrogen material layer, inhales the hydrogen material through the reversibility and collects hydrogen, releases after the collection completion again, can obtain pure hydrogen.
The ammonia recovery mechanism is including being used for carrying out the preheater preheated to the washing liquid, the inlet end of preheater has the water pump through the pipe connection, and the flowing back end has crystallization device through the pipe connection, the inlet end of water pump is connected with the ammonia washing tower through the pipeline, crystallization device's flowing back end has solid-liquid separation ware through the pipe connection.
Preferably, the hydrogen adsorption device comprises a hydrogen absorption box, a heat preservation layer and an electric heating layer are sequentially arranged in the hydrogen absorption box from outside to inside, a vacuum pump is arranged at the top end of the hydrogen absorption box, a first air inlet pipe is arranged at the lower end of the hydrogen absorption box, a hydrogen discharge pipe is arranged at the top end of the hydrogen absorption box, the end, away from the hydrogen absorption box, of the first air inlet pipe is connected with the drying device, a waste discharge pipe is arranged at the side part of the upper end of the hydrogen absorption box, the end, away from the hydrogen absorption box, of the waste discharge pipe is connected with a fuel gas pipe network, an air inlet valve is arranged on the first air inlet pipe, a first exhaust valve is arranged on the hydrogen discharge pipe, a second exhaust valve is arranged on the waste discharge pipe, a plurality of slide rails are uniformly distributed on the left side and the right side of the hydrogen absorption box, the hydrogen absorption material layer comprises a fixed net, slide grooves are arranged on the left side and the right side of the fixed net, the slide rails are in sliding connection with the slide rails, reversible hydrogen absorption material is arranged in the fixed net, and the hydrogen absorption box is pressurized through the vacuum pump, the temperature in the hydrogen absorption box is adjusted through the electric heating layer, when the hydrogen absorption condition of the hydrogen absorption material is met, the dried purge gas is introduced into the hydrogen absorption box, the reversible hydrogen absorption material absorbs the hydrogen in the purge gas, and the rest gas is discharged through the exhaust pipe; when the reversible hydrogen absorption material releases hydrogen, the electric heating layer heats the hydrogen absorption box, reduces the pressure in the hydrogen absorption box and discharges the hydrogen through the hydrogen discharge pipe.
Preferably, the ammonia washing tower comprises a tower body, a second air inlet pipe is arranged at the side part of the lower end of the tower body, an air outlet pipe is arranged at the top end of the tower body, and the lower end in the tower body is provided with a uniform flow plate, the left side and the right side of the middle part are both obliquely provided with a plurality of flow guide plates, a cleaning pipe is arranged above the flow guide plates, the bottom of the cleaning pipe is provided with a plurality of cleaning ports, one end of the cleaning pipe extends out of the tower body and is connected with a sulfuric acid storage tank, the top end of the tower body is provided with a demister, the demister corresponds to the air outlet pipe, the sulfuric acid is sprayed out through a cleaning opening on the cleaning pipe, the purge gas enters the ammonia washing tower through the second air inlet pipe, the purge gas flows uniformly to the upper end of the ammonia washing tower after passing through the flow equalizing plate, and then is guided by the guide plate, so that the purge gas stays in the ammonia washing tower for a long time, the sulfuric acid reacts with the ammonia in the purge gas, ammonia gas in the purge gas is removed through an ammonia washing tower, and the ammonium sulfate is recovered through an ammonia recovery mechanism.
Preferably, the crystallization device includes the box, the upper end is equipped with the baffle in the box, and the lower extreme is equipped with the electric heating board, the equipartition has a plurality of water conservancy diversion holes on the baffle, water conservancy diversion hole bottom corresponds and is equipped with the sprinkler bead, and the washing liquid gets into the box lower extreme through the water conservancy diversion hole, and the electric heating board heats the crystallization to the washing liquid, separates through solid-liquid separator again, carries out recycle to the ammonium sulfate.
The utility model also comprises other components which can be normally used by the recovery device of the hydrogen in the purge gas of the synthetic ammonia, and all the components are conventional technical means in the field. In addition, the undefined devices or components of the present invention are all those conventionally used in the art.
When the ammonia washing tower is used, the purge gas is introduced into the ammonia washing tower through the second gas inlet pipe, ammonia in the purge gas is removed through the ammonia washing tower, the purge gas after ammonia removal is dried by the drying device and then enters the hydrogen adsorption device, reversible hydrogen absorption materials in the hydrogen adsorption device only absorb the hydrogen in the purge gas, the rest gas enters the fuel gas pipe network for combustion, cleaning liquid flowing out of a liquid discharge end of the ammonia washing tower is preheated by the preheater and then enters the crystallization device, the electric heating plate heats and crystallizes the cleaning liquid, and the crystallized cleaning liquid enters the solid-liquid separator for separation and recycling of ammonium sulfate.
The ammonia washing tower has the beneficial effects that the structure is simple, the operation is convenient, ammonia in the purge gas is removed through the ammonia washing tower, the ammonia in the cleaning liquid is recovered by the ammonia recovery mechanism, the purge gas is recovered by the hydrogen recovery mechanism, and pure hydrogen can be obtained.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural view of the hydrogen adsorbing device of the present invention.
Detailed Description
The present invention will be described more clearly with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.
Examples
As shown in FIGS. 1-2, the device for recovering hydrogen from discharged gas of synthetic ammonia comprises an ammonia washing tower 1, wherein the exhaust end of the ammonia washing tower 1 is connected with a hydrogen recovery mechanism, and the liquid discharge end of the ammonia washing tower 1 is connected with an ammonia recovery mechanism through a pipeline.
The hydrogen recovery mechanism is including being used for carrying out dry drying device 7 to the speed gassing, the inlet end of drying device 7 is connected with the exhaust end of washing ammonia tower 1 through the pipeline, and the exhaust end of drying device 7 has hydrogen adsorption equipment through the pipe connection, hydrogen adsorption equipment's exhaust end has fuel gas pipe network 9 through the pipe connection, and is equipped with the multilayer from last to having in proper order down in the hydrogen adsorption equipment and inhales hydrogen material layer 8, it inhales the hydrogen material to be equipped with the reversibility in the hydrogen material layer 8, inhales the hydrogen material through the reversibility and collects hydrogen, releases after the collection completion again, can obtain pure hydrogen.
Ammonia recovery mechanism is including being used for carrying out the preheater 11 that preheats to the washing liquid, there is water pump 10 liquid inlet end of preheater 11 through the pipe connection, and the flowing back end has crystallization device through the pipe connection, the liquid inlet end of water pump 10 is connected with ammonia washing tower 1 through the pipeline, crystallization device's flowing back end has solid-liquid separation ware 16 through the pipe connection.
The hydrogen adsorption device comprises a hydrogen absorption box 17, a heat preservation layer 18 and an electric heating layer 19 are sequentially arranged in the hydrogen absorption box 17 from outside to inside, a vacuum pump 21 is arranged at the top end of the hydrogen absorption box 17, a first air inlet pipe is arranged at the lower end of the hydrogen absorption box 17, a hydrogen discharge pipe is arranged at the top end of the hydrogen absorption box, the end, away from the hydrogen absorption box 17, of the first air inlet pipe is connected with a drying device 7, a waste gas discharge pipe 20 is arranged at the side part of the upper end of the hydrogen absorption box 17, the end, away from the hydrogen absorption box 17, of the waste gas discharge pipe 20 is connected with a fuel gas pipe network 9, an air inlet valve is arranged on the first air inlet pipe, a first exhaust valve is arranged on the hydrogen discharge pipe, a second exhaust valve is arranged on the waste gas discharge pipe 20, a plurality of slide rails are uniformly distributed on the left side and the right side in the hydrogen absorption box 17, a hydrogen absorption material layer comprises a fixing net 22, slide grooves are arranged on the left side and the right side of the fixing net 22 and are slidably connected with the slide rails, reversible hydrogen absorption material is arranged in the fixing net 22, during hydrogen absorption, the inside of the hydrogen absorption box 17 is pressurized through a vacuum pump 21, the temperature in the hydrogen absorption box 17 is adjusted through an electric heating layer 19, when the hydrogen absorption condition of the hydrogen absorption material is met, dried purge gas is introduced into the hydrogen absorption box 17, the hydrogen in the purge gas is absorbed by the reversible hydrogen absorption material, and the rest gas is discharged through an exhaust pipe; when the reversible hydrogen absorption material releases hydrogen, the electric heating layer 19 heats the inside of the hydrogen absorption tank 17, reduces the pressure in the hydrogen absorption tank 17, and discharges the hydrogen through the hydrogen discharge pipe.
The ammonia washing tower 1 comprises a tower body, wherein a second air inlet pipe is arranged on the side portion of the lower end of the tower body, an air outlet pipe is arranged at the top end of the tower body, a flow equalizing plate 2 is arranged at the lower end of the tower body, a plurality of guide plates 3 are obliquely arranged on the left side and the right side of the middle of the tower body, a cleaning pipe 4 is arranged above the guide plates 3, a plurality of cleaning ports 5 are arranged at the bottom of the cleaning pipe 4, one end of the cleaning pipe 4 extends out of the tower body and is connected with a sulfuric acid storage tank (not shown in the figure), a foam remover 6 is arranged at the top end of the tower body, the foam remover 6 corresponds to the air outlet pipe, sulfuric acid is sprayed out through the cleaning ports 5 on the cleaning pipe 4, purge gas enters the ammonia washing tower 1 through the second air inlet pipe, the purge gas uniformly flows to the upper end of the ammonia washing tower 1 after passing through the flow equalizing plate 2 and is guided by the guide plates 3, so that the purge gas stays for a long time in the ammonia washing tower 1, the sulfuric acid reacts with ammonia in the purge gas, and ammonia gas is removed through the ammonia washing tower 1, and the ammonium sulfate is recovered by an ammonia recovery mechanism.
The crystallization device includes box 12, the upper end is equipped with baffle 13 in the box 12, and the lower extreme is equipped with electric heating plate 15, the equipartition has a plurality of water conservancy diversion holes on the baffle 13, water conservancy diversion hole bottom corresponds and is equipped with sprinkler bead 14, and the washing liquid gets into box 12 lower extreme through water conservancy diversion hole, and electric heating plate 15 heats the crystallization to the washing liquid, separates through solid-liquid separator again, carries out recycle to the ammonium sulfate.
When the ammonia washing tower is used, the purge gas is introduced into the ammonia washing tower 1 through the second gas inlet pipe, ammonia in the purge gas is removed through the ammonia washing tower 1, the purge gas after ammonia removal is dried by the drying device 7 and then enters the hydrogen adsorption device, reversible hydrogen absorption materials in the hydrogen adsorption device only absorb hydrogen in the purge gas, the rest gas enters the fuel gas pipe network 9 for combustion, cleaning liquid flowing out of a liquid discharge end of the ammonia washing tower 1 is preheated by the preheater 11 and then enters the crystallization device, the electric heating plate 15 heats and crystallizes the cleaning liquid, and the crystallized cleaning liquid enters the solid-liquid separator for separation 16 and ammonium sulfate is recycled.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (4)
1. The utility model provides a recovery unit of hydrogen in synthetic ammonia purge gas, includes ammonia scrubber, its characterized in that: the exhaust end of the ammonia washing tower is connected with a hydrogen recovery mechanism, and the liquid discharge end of the ammonia washing tower is connected with an ammonia recovery mechanism through a pipeline;
the hydrogen recovery mechanism comprises a drying device for drying the purge gas, the gas inlet end of the drying device is connected with the gas outlet end of the ammonia washing tower through a pipeline, the gas outlet end of the drying device is connected with a hydrogen adsorption device through a pipeline, the waste gas discharge end of the hydrogen adsorption device is connected with a fuel gas pipe network through a pipeline, multiple layers of hydrogen absorption material layers are sequentially arranged in the hydrogen adsorption device from top to bottom, and reversible hydrogen absorption materials are arranged in the hydrogen absorption material layers;
the ammonia recovery mechanism comprises a preheater, the liquid inlet end of the preheater is connected with a water pump through a pipeline, the liquid discharge end of the preheater is connected with a crystallization device through a pipeline, the liquid inlet end of the water pump is connected with an ammonia washing tower through a pipeline, and the liquid discharge end of the crystallization device is connected with a solid-liquid separator through a pipeline.
2. The apparatus for recovering hydrogen from syngas purge gas as defined in claim 1, wherein: the hydrogen adsorption device comprises a hydrogen absorption box, a heat preservation layer and an electric heating layer are sequentially arranged from outside to inside in the hydrogen absorption box, a vacuum pump is arranged at the top end of the hydrogen absorption box, a first air inlet pipe is arranged at the lower end of the hydrogen absorption box, a hydrogen exhaust pipe is arranged at the top end of the hydrogen absorption box, the hydrogen absorption box end is far away from the first air inlet pipe and is connected with a drying device, a waste exhaust pipe is arranged at the side part of the upper end of the hydrogen absorption box, the waste exhaust pipe is far away from the hydrogen absorption box end and is connected with a fuel gas pipe network, an air inlet valve is arranged in the first air inlet pipe, a first exhaust valve is arranged on the hydrogen exhaust pipe, a second exhaust valve is arranged on the waste exhaust pipe, a plurality of slide rails are uniformly distributed on the left side and the right side in the hydrogen absorption box, a hydrogen absorption material layer comprises a fixed net, chutes are arranged on the left side and the right side of the fixed net, the chutes are connected with slide rails in a sliding manner, and reversible hydrogen absorption materials are arranged in the fixed net.
3. The apparatus for recovering hydrogen from syngas purge gas as defined in claim 1, wherein: wash the ammonia tower and include the tower body, tower body lower extreme lateral part is equipped with the second intake pipe, and the top is equipped with the outlet duct, and the lower extreme is equipped with the even flow board in the tower body, and the equal slope of middle part left and right sides is equipped with a plurality of guide plates, the guide plate top is equipped with the scavenge pipe, the scavenge pipe bottom is equipped with a plurality of washing mouths, and scavenge pipe one end stretches out the tower body and is connected with sulphuric acid storage tank, the tower body top is equipped with the demister, the demister is corresponding with the outlet duct.
4. The apparatus for recovering hydrogen from syngas purge gas as defined in claim 1, wherein: the crystallizing device comprises a box body, wherein a partition plate is arranged at the upper end in the box body, an electric heating plate is arranged at the lower end in the box body, a plurality of flow guide holes are uniformly distributed in the partition plate, and water spray heads are correspondingly arranged at the bottoms of the flow guide holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123077764.5U CN216191074U (en) | 2021-12-09 | 2021-12-09 | Hydrogen recovery device in synthetic ammonia purge gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123077764.5U CN216191074U (en) | 2021-12-09 | 2021-12-09 | Hydrogen recovery device in synthetic ammonia purge gas |
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| Publication Number | Publication Date |
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| CN216191074U true CN216191074U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123077764.5U Active CN216191074U (en) | 2021-12-09 | 2021-12-09 | Hydrogen recovery device in synthetic ammonia purge gas |
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| CN (1) | CN216191074U (en) |
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2021
- 2021-12-09 CN CN202123077764.5U patent/CN216191074U/en active Active
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