CN215924414U - Urea hydrolysis product gas purification system - Google Patents

Urea hydrolysis product gas purification system Download PDF

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Publication number
CN215924414U
CN215924414U CN202122448868.6U CN202122448868U CN215924414U CN 215924414 U CN215924414 U CN 215924414U CN 202122448868 U CN202122448868 U CN 202122448868U CN 215924414 U CN215924414 U CN 215924414U
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product gas
dehydration
pipeline
gas
absorption
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袁壮
潘栋
杨世极
董陈
罗志
尚桐
徐晓涛
舒凯
李淑宏
杨晓刚
曹帅峰
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The utility model relates to a urea hydrolysis product gas purification system, which comprises a urea hydrolysis reactor, a dehydration device and CO2An absorption desorption device and an ammonia supply main pipe; a product gas outlet and a product gas heat tracing pipeline are arranged on the urea hydrolysis reactor; the dewatering devices comprising at least two parallel-connectedThe dehydration unit is provided with an electric heating component in a gap between the dehydration outer shell and the dehydration inner shell; a gas drying agent is arranged in the dehydration inner shell, and the side wall of the dehydration inner shell is connected with a product gas inlet pipeline, a product gas outlet pipeline and a water vapor outlet pipeline; CO 22The absorption and desorption device comprises two devices for removing CO2A unit and a gas cooling device; CO removal2A gas channel is formed between the unit absorption outer shell and the unit absorption inner shell and is respectively communicated with the output end of the dehydrated product gas pipeline, and the two CO removing pipelines are used for removing CO2The unit absorption inner shells are respectively communicated with the ammonia supply mother pipe through corresponding inner shell product gas outlet pipelines.

Description

Urea hydrolysis product gas purification system
Technical Field
The utility model relates to the field of preparation of a flue gas denitration reducing agent, in particular to a urea hydrolysis product gas purification system.
Background
At present, a Selective Catalytic Reduction (SCR) process is mostly adopted in a denitration system of a coal-fired thermal power plant, ammonia is used as a reducing agent required by a denitration reaction, and the ammonia can be obtained by utilizing liquid ammonia, ammonia water and urea. Liquid ammonia, aqueous ammonia evaporation system ammonia, these two kinds of ammonia system simple process, initial investment, running cost and maintenance cost are lower and easy control, but because liquid ammonia or aqueous ammonia are a poisonous dangerous chemical, the flue gas denitration liquid ammonia of power plant or aqueous ammonia quantity is big simultaneously, store and have formed great danger source more, and the safety risk is very high. In order to reduce the number of major dangerous sources in a plant area, most of the existing thermal power plants adopt a urea hydrolysis ammonia preparation process to prepare a reducing agent ammonia.
The main equations for the urea hydrolysis reaction are:
Figure BDA0003298376880000011
Figure BDA0003298376880000012
the urea solution with a certain concentration reacts under the heating of saturated steam to generate an intermediate product ammonium carbamate, the ammonium carbamate further reacts to generate ammonia gas and carbon dioxide, and finally the ammonia gas and the carbon dioxide are mixed with steam to form mixed product gas. At present, the mass fraction of the urea is 50%, and the volume fractions of all components in the mixed gas generated by the hydrolysis reaction of the urea account for 44% of water vapor, 19% of carbon dioxide and 37% of ammonia gas. The intermediate product ammonium carbamate generated in the urea solution hydrolysis reaction process has strong corrosivity, and the mixed gas can react and condense reversely under the low-temperature condition to produce ammonium carbamate, corrode an ammonia supply main pipe and accessory parts, and simultaneously further dehydrate to form urea crystals to block a pipeline. At present, in order to prevent the mixed gas from generating a large proportion of reversible reaction and prevent water vapor from condensing into water, heat tracing is often adopted to keep the temperature of the mixed gas. The temperature of the product at the outlet of the urea hydrolysis reactor is 130-160 ℃, the pressure of an ammonia supply main pipe is 0.35-0.55 MPa, and in order to keep the temperature of the product gas in the conveying process at the outlet of the hydrolyzer, the heat tracing temperature of a product gas conveying pipeline needs to be kept at 140-170 ℃. The heat tracing modes of the ammonia supply main pipe of the existing running hydrolyzer comprise steam half-pipe heat tracing, steam jacket pipes, electric heat tracing and the like, a large amount of energy is consumed no matter which heat tracing mode is adopted, and meanwhile, the heat tracing and heat preservation construction quality is higher due to higher heat tracing temperature.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a urea hydrolysis product gas purification system which is reasonable in design, simple in structure and convenient to use and can simultaneously remove water vapor and CO in product gas2。
The utility model is realized by the following technical scheme:
urea hydrolysis productThe product gas purification system comprises a urea hydrolysis reactor, a dehydration device and CO which are connected in sequence2An absorption desorption device and an ammonia supply main pipe;
a product gas outlet and a product gas heat tracing pipeline are sequentially arranged on the urea hydrolysis reactor;
the dehydration device comprises at least two dehydration units which are arranged in parallel; the dehydration unit comprises a dehydration outer shell and a dehydration inner shell; a gap is arranged between the dehydration outer shell and the dehydration inner shell, and an electric heating assembly is arranged in the gap; a gas drying agent is arranged in the dehydration inner shell, and a product gas inlet pipeline, a product gas outlet pipeline and a water vapor outlet pipeline are connected and arranged on the side wall of the dehydration inner shell; the product gas inlet pipelines of the two dehydration units are respectively connected with the product gas heat tracing pipeline, and the product gas outlet pipelines are connected with the input end of the dehydrated product gas pipeline after confluence;
the CO is2The absorption and desorption device comprises two devices for removing CO2Unit and two CO removal2Gas cooling means between the cells; the removal of CO2The unit comprises an absorption outer shell, an absorption inner shell and a gas channel formed between the absorption outer shell and the absorption inner shell; two CO removal2The gas channels of the units are respectively communicated with the output ends of the dehydrated product gas pipelines, and the two pipelines are used for removing CO2The gas channels of the units are respectively connected with a gas cooling device and then are removed with CO with another gas cooling device2The absorption inner shells of the units are communicated; two CO removal2The absorption inner shells of the units are respectively communicated with the ammonia supply mother pipe through corresponding inner shell product gas outlet pipelines, and the two absorption inner shells are used for removing CO2CO is arranged in the absorption inner shell of the unit2Solid amine sorbent, two for CO removal2The absorption inner shells of the units are also respectively provided with CO2And collecting the outlet pipeline.
Furthermore, the dehydration unit also comprises a temperature measuring instrument, a humidity measuring instrument and a valve which are arranged on the pipeline; the removal of CO2The unit further comprises a CO arranged on the pipeline2Detector and valve.
Further, an isolation steel plate is horizontally arranged in the dehydration inner shell; one end of the isolation steel plate is connected with the side wall of the dehydration inner shell, and the gas desiccant arrangement area is divided into a gas inlet area and a gas outlet area.
Furthermore, a desiccant isolation screen plate is vertically arranged in the dehydration inner shell, the desiccant isolation screen plate is connected with the isolation steel plate and the side wall of the dehydration inner shell, and the gas desiccant is arranged in an accommodating space defined by the desiccant isolation screen plate.
Further, the dehydration unit also comprises a water vapor condensation box; the steam condensation box is connected with the steam outlet pipeline.
Furthermore, the dehydration unit adopts a box body type, and a gap between the dehydration outer shell and the dehydration inner shell is internally provided with a square-shaped electric heating component.
Further, said CO2The absorption and desorption device also comprises CO2A collection box; the CO is2Collecting tank and first CO2Collecting the inlet duct and the second CO2The collection inlet is connected with a pipeline.
Further, gas cooling device adopts the water-cooling mode, and its inside is provided with the heat exchange tube bank as exothermic loop, and the outside is provided with demineralized water inlet pipeline and demineralized water outlet pipeline.
Compared with the prior art, the utility model has the following beneficial technical effects:
the system of the utility model arranges a dehydration device and CO in sequence at the product gas outlet of the urea hydrolysis reactor2An absorption desorption device for drying and removing the water vapor in the product gas by using the gas drying agent in the dehydration unit and removing CO from the dehydrated product gas by using two devices2The unit removes carbon dioxide in the product gas, and finally the product gas with water vapor and carbon dioxide removed is sent to subsequent denitration operation through an ammonia supply main pipe, so that the problems of corrosion and blockage of the urea hydrolysis product gas to a supply pipeline, high construction difficulty of heat tracing and heat preservation and the like can be effectively solved, and meanwhile, the removal of the water vapor in the product gas is beneficial to the normal operation of downstream catalyst equipment; the adopted dehydration device comprises at least two dehydration units which can ensure the continuous dehydration operation while effectively removing the water vapor in the hydrolysis product gas,while using two CO removal systems2The connection mode of the gas cooling device arranged in the middle of the unit can effectively ensure that the carbon dioxide absorption process is smoothly carried out; meanwhile, the removed water vapor can be discharged in time through a water vapor outlet pipeline arranged on the dehydration unit, and CO is removed through the arrangement2CO on the unit2The collection outlet pipeline discharges the removed carbon dioxide in time, the purification system reduces the heat tracing and heat preservation work of the ammonia supply main pipe, and solves the problems of pipeline corrosion and blockage, so that the ammonia supply system is simpler and more convenient, and is safe and reliable.
Further, the system of the present invention is operated by removing CO in a dehydration unit2The units are respectively provided with a humidity measuring instrument and CO2The detector can timely and accurately master the conditions of gas humidity and carbon dioxide concentration in the pipeline, so that corresponding operation units are controlled to perform steam desorption, carbon dioxide desorption and absorption, gas desiccant drying and the like according to needs, the design is reasonable, and the safety and reliability of the system are further ensured.
Furthermore, the system adopts the isolation steel plate arranged in the dehydration inner shell of the dehydration unit, and can separate the gas inlet from the gas outlet, thereby increasing the retention time of the product gas in the inner shell, enhancing the drying effect and fully absorbing the water vapor.
Furthermore, the system can effectively prevent the gas desiccant from entering the pipeline by arranging the desiccant isolation screen plate, thereby improving the safety and reliability.
Furthermore, the system of the utility model adopts the structure that the water vapor condensation box is arranged in the dehydration device, so that the removed water vapor is collected in the water vapor condensation box through the water vapor outlet pipeline, and the environmental protection safety of the system is effectively ensured.
Furthermore, the system adopts the box type dehydration unit, and the square-shaped electric heating component is arranged in the square-shaped gap formed by the outer shell and the inner shell of the box type dehydration unit, so that the temperature of each part of the gas desiccant can be uniform, any heated surface is not omitted, and the drying efficiency and effect are improved.
Furthermore, the system of the utility model adopts the structure that the product gas inlet pipeline of the first dehydration unit is provided with the temperature measuring instrument, so that the temperature in the pipeline can be measured, and the safety and the reliability of the system are ensured.
Further, the system of the present invention is implemented by using a first CO2Collecting the inlet duct and the second CO2CO is connected to the collection inlet pipeline2The collecting box can be used for intensively collecting the carbon dioxide desorbed and absorbed, is environment-friendly, efficient, convenient and feasible.
Furthermore, the gas cooling device adopted by the system is in a water cooling mode, and the heat exchange cooling is realized through the heat exchange tube bundle and the desalted water inlet and outlet pipeline arranged inside the gas cooling device, so that the system is simple in structure and good in treatment effect.
Drawings
Fig. 1 is a schematic structural diagram of the system according to the embodiment of the present invention.
In the figure: 1-urea hydrolysis reactor, 2-product gas outlet, 3-product gas heat tracing pipeline, 4-first valve, 5-second valve, 6-first dehydration unit, 61-first product gas inlet pipeline, 62-first isolation steel plate, 63-first product gas outlet pipeline, 64-first electric heating component, 65-first dryer isolation screen plate, 66-first steam outlet pipeline, 67-first gas desiccant, 7-second dehydration unit, 71-second product gas inlet pipeline, 72-second isolation steel plate, 73-second dryer isolation screen plate, 74-second electric heating component, 75-second steam outlet pipeline, 76-second product gas outlet pipeline, 77-second gas desiccant, 8-first removal of CO.2Unit, 81-first outer shell product gas inlet line, 82-first inner shell product gas outlet line, 83-first CO2Solid amine sorbent, 84-first CO2A collection outlet line, 85-a first inner shell product gas inlet line, 86-a first outer shell product gas outlet line, 9-a second CO removal2Unit, 91-second outer shell product gas inlet duct, 92-second inner shell product gas outlet duct, 93-second CO2Solid amine sorbent, 94-second CO2A collection outlet pipeline, 95-a second inner shell product gas inlet pipeline, 96-a second outer shell product gas outlet pipeline, 10-a temperature measuring instrument, 11-a first humidity measuring instrument, 12-a third valve, 13-a fourth valve, 14-A fifth valve, 15-a water vapor condensation box, 16-a second humidity measuring instrument, 17-a third humidity measuring instrument, 18-a sixth valve, 19-a seventh valve, 20-an eighth valve, 21-a dehydrated product gas pipeline, 22-a first CO2The device comprises a detector, 23-a ninth valve, 24-a tenth valve, 25-an eleventh valve, 26-a heat exchange tube bundle, 27-a gas cooling device, 28-a desalted water outlet pipeline, 29-a twelfth valve, and 30-CO2Collecting tank, 31-thirteenth valve, 32-fourteenth valve, 33-second CO2The device comprises a detector, 34-a fifteenth valve, 35-a sixteenth valve, 36-a seventeenth valve, 37-a desalted water inlet pipeline, 38-an eighteenth valve, 39-a nineteenth valve, 40-a twentieth valve, 41-a third CO2And (7) detecting the instrument.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the utility model.
The utility model relates to a urea hydrolysis product gas purification system, which comprises a urea hydrolysis reactor 1, wherein a product gas outlet 2 is arranged in the reactor; the product gas outlet 2 is connected with the inlet of the dehydration device through a product gas heat tracing pipeline 3; the outlet of the dehydration device is connected with CO through a dehydrated product gas pipeline 212An absorption desorption device inlet; the CO is2The outlet of the absorption desorption device is connected with an ammonia supply main pipe; namely the ammonia supply main pipe is connected with a product gas dehydration device and CO2Absorption and desorption device, wherein the dehydration device is positioned in the urea hydrolysis reactor 1 and the CO2Between the absorption and desorption devices;
the dehydration device comprises at least two dehydration units and a water vapor condensation box 15; the dehydration units are sequentially connected in parallel on the product gas heat tracing pipeline 3; the dehydration unit comprises a dehydration inner shell, a dehydration outer shell, a temperature measuring instrument 10, a humidity measuring instrument, a product gas inlet and outlet pipeline and a water vapor outlet pipeline; a product gas outlet pipeline, a product gas inlet pipeline and a water vapor outlet pipeline are arranged on a dehydration inner shell of the dehydration unit, a desiccant isolation screen plate is vertically arranged in the dehydration inner shell, and an isolation steel plate is horizontally arranged; a gas desiccant is arranged in an accommodating space defined by the desiccant isolation screen plates, and the desiccant isolation screen plates are connected with the isolation steel plates and the side wall of the dehydration inner shell; a gap space is formed between the dehydration outer shell and the dehydration inner shell, and when the dehydration unit adopts a box body type, a high-temperature electric heating assembly in a shape of 'hui' is arranged in the gap between the dehydration outer shell and the dehydration inner shell; valves are respectively arranged on the pipelines;
the CO is2The absorption and desorption device comprises a first CO removal device2Unit 8, second CO removal2Unit 9, CO2A collection tank 30 and a gas cooling device 27; the first CO removal2Unit 8 and second CO removal2The units 9 each comprise a respective inner absorbent shell, outer absorbent shell, gas channels formed between the outer absorbent shell and the inner absorbent shell, and CO2A detector, etc.; the first CO removal2Unit 8 and second CO removal2The outer shells of the units 9 are all rectangular-square gas channels, and are respectively provided with an outer shell product gas inlet and outlet pipeline, and an inner shell is internally provided with a product gas inlet and outlet pipeline and respective CO2Solid amine sorbent, CO2A collection outlet conduit; the gas cooling devices 27 are located in two sets of CO removal units2Between the units, a water cooling mode is adopted, a heat exchange tube bundle 26 of a heat release loop is arranged in the unit, and a demineralized water inlet pipeline 37 and a demineralized water outlet pipeline 28 are arranged outside the unit; valves are respectively arranged on the pipelines;
the first CO removal2The absorption inner shell of the unit 8 is provided with a first CO2A solid amine sorbent 83 having a first inner shell product gas inlet conduit 85 and a first inner shell product gas outlet conduit 82 disposed on both sidewalls and a first CO disposed on the bottom2A collection outlet conduit 84; the first CO removal2A first shell product gas inlet conduit 81 and a first shell product gas outlet conduit 86 are provided in the side walls of the absorption shell of unit 8;
the second CO removal2The second CO is arranged in the absorption inner shell of the unit 92A solid amine sorbent 93, a second inner shell product gas inlet pipeline 95 and a first inner shell product gas outlet pipeline 92 are arranged on the two side walls, and a second CO is arranged at the bottom2A collection outlet conduit 94; the second CO removal2A second shell product gas inlet duct 91 and a second shell product gas outlet duct 96 are provided on the side wall of the absorption shell of the unit 9;
the first shell product gas inlet pipeline 81 or the second shell product gas inlet pipeline 91 is respectively connected with the dehydrated product gas pipeline 21; the first outer shell product gas outlet pipeline 86 or the first inner shell product gas inlet pipeline 85 is respectively connected with a second inner shell product gas inlet pipeline 95 or a first outer shell product gas outlet pipeline 96 through a heat release loop of the gas cooling device 27; the first inner shell product gas outlet pipeline 92 or the first inner shell product gas outlet pipeline 82 is respectively connected with an ammonia supply mother pipe;
a product gas inlet pipeline of the dehydration unit is provided with a temperature measuring instrument 10 and a humidity measuring instrument; the product gas outlet pipelines of the two dehydration units are respectively provided with a humidity measuring instrument; the dehydrated product gas pipeline 21, the first inner shell product gas outlet pipeline 92 and the first inner shell product gas outlet pipeline 82 are respectively provided with first CO2Detector 22, second CO2Detector 33 and third CO2A detector 41;
and valves are arranged on the pipelines and are used for controlling the flow of the product gas in the pipelines.
In the following, taking the dewatering device using two parallel dewatering units as an example, as shown in fig. 1, the specific structure and operation principle of the system of the present invention are explained as follows,
the product gas enters a first dehydration unit 6, is dried and then is discharged; when the third gas humidity measuring instrument 17 of the first product gas outlet pipeline 63 of the first dehydration unit 6 shows that the gas humidity exceeds the standard, stopping the product gas from entering the first dehydration unit 6, guiding the product gas to enter the second dehydration unit 7 for drying, simultaneously starting the first electric heating component 64 in the outer shell of the first dehydration unit 6, removing water and drying the first gas drying agent 67 in the inner shell, and enabling the evaporated water vapor to enter the water vapor condensation box 15 through the first water vapor outlet pipeline 66; similarly, when the gas humidity of the second product gas outlet pipeline 76 of the second dehydration unit 7 exceeds the standard, the product gas circularly enters the first dehydration unit 6 for dehydration and drying;
the dehydrated product gas enters a first CO removal2Inside the outer shell of the unit 8, the first CO in the inner shell is treated by the high-temperature characteristic2The solid amine sorbent 83 is subjected to a desorption treatment, the desorbed CO2By first CO2Collecting the outlet line 84 into the CO2A collection tank 30; the product gas after releasing heat enters a heat exchange tube bundle 26, the heat exchange tube bundle 26 is arranged in a gas cooling device 27, and the gas cooling device 27 adopts a water cooling mode, so that the product gas enters a second CO removal mode after being further cooled2 Unit 9, to which CO2The absorption is performed, and then the product gas enters the ammonia supply mother pipe through the second inner shell product gas outlet pipe 92 to send the ammonia gas to the denitration area. When the second CO removal is performed2Second CO of second inner Shell product gas Outlet line 92 of Unit 92The detector 33 is used for guiding the product gas to enter the second CO removal mode when the measurement exceeds the standard2In the outer shell of the unit 9, for the second CO in the inner shell2 Solid amine sorbent 93 for CO2Desorption, then the product gas enters the first CO removal2Inner shell of unit 8, first CO therein2Solid amine sorbent 83 for CO in product gas2Carrying out adsorption;
passing through a dehydration unit to remove CO2Unit pair urea hydrolysis reactor 1 for producing water vapor and CO in ammonia product gas2After the ammonia gas is removed, only ammonia gas is basically left in the product gas, high-temperature heat tracing and heat preservation are not needed, the problems of blockage and corrosion of an ammonia supply main pipe are solved, and meanwhile, the normal operation of downstream equipment is facilitated.
In practical applications, the specific operation steps of using the above-described utility model system are as follows, as shown in figure 1,
firstly, urea hydrolysis ammonia production product gas in a urea hydrolysis reactor 1 enters a dehydration device through a product gas outlet 2 and a product gas heat tracing pipeline 3: opening the second valve 5, the sixth valve 18 and the eighth valve 20, closing the valves, namely the first valve 4, the third valve 12 and the seventh valve 19, measuring the temperature and humidity of the gas in the pipeline through the first humidity measuring instrument 11 and the temperature measuring instrument 10, then enabling the product gas to enter the first dehydration unit 6, dividing the arrangement area of the first gas desiccant 67 into a gas inlet area (upper part) and a gas outlet area (lower part) through a first isolation steel plate 62, and preventing the desiccant from entering the pipeline openings of the first product gas inlet pipeline 61, the first product gas outlet pipeline 63 and the first water vapor outlet pipeline 66 through a first dryer isolation mesh plate 65; the product gas enters the inner shell of the first dehydration unit 6 through the first product gas inlet pipeline 61, the first gas drying agent 67 in the inner shell is used for absorbing water vapor in the product gas, then the product gas enters the first product gas outlet pipeline 63, the gas humidity in the first product gas outlet pipeline 63 is detected through the third humidity measuring instrument 17, and the product gas enters the dehydrated product gas pipeline 21 after meeting the requirements;
when the gas humidity exceeds the standard, the second valve 5, the sixth valve 18 and the fifth valve 14 are closed, the first valve 4 and the seventh valve 19 are opened, the second dehydration unit 7 is used for drying the product gas, the first electric heating assembly 64 is started to perform high-temperature dehydration and drying on the first gas drying agent 67 in the first dehydration unit 6, the third valve 12 and the fourth valve 13 are opened, and the evaporated water vapor enters the water vapor condensation tank 15 through the first water vapor outlet pipeline 66; similarly, when the humidity of the gas in the second product gas outlet pipeline 76 of the second dehydration unit 7 exceeds the standard, the gas is immediately put into the first dehydration unit 6 for dehydration of the product gas, and simultaneously, the second gas desiccant 77 in the inner shell of the second dehydration unit 7 is dehydrated and dried, and then the system is converted into a standby system;
then, the ninth valve 23 is opened to pass the first CO2The measuring instrument 22 detects CO in the dehydrated product gas pipeline 212Content of, then into CO2An absorption desorption device: the product gas is passed through a first housing product gas inlet conduit 81 to a first CO removal2In the unit 8 housing, the first CO removal is desorbed by the high temperature characteristic2First CO in inner Shell of Unit 82CO adsorbed by solid amine sorbent 832Opening the eleventh valve 25 to remove CO first2Desorbed CO in the inner shell of unit 82By first CO2Collecting line inlet 84 into the CO2A collection tank 30; the sixteenth valve 35 and the eighteenth valve 38 are then opened, the product gas enters the heat exchange tube bundle 26 through the first shell product gas outlet pipe 86, and the heat exchange tube bundle 26 is placed in the gas cooling deviceThe product gas is further cooled in a 27, and then enters a second CO removal2In the inner shell of the unit 9, the second CO is utilized2Solid amine sorbent 93 absorbs CO from product gas2Then, the fourteenth valve 32 is opened, and the purified product gas is sent to the ammonia supply mother pipe by using the second inner shell product gas outlet pipeline 92;
wherein, the seventeenth valve 36 and the twelfth valve 29 respectively arranged on the demineralized water inlet pipeline 37 and the demineralized water outlet pipeline 28 of the gas cooling device 27 control the inlet and the outlet of the demineralized water; when the second CO is2 Detector 33 measures CO in pipeline2If the gas exceeds the standard, the ninth valve 23, the sixteenth valve 35, the eighteenth valve 38, the fourteenth valve 32 and the eleventh valve 25 are immediately closed, the tenth valve 24 is opened, and the product gas is sent to the second CO removal system2In the outer shell of the unit 9, the second CO in the inner shell is removed by utilizing the high-temperature characteristic of the product gas2CO-RICH ADSORPTION OF SOLID AMINE SORBENT 932Desorption, followed by opening the thirteenth valve 31, desorption of CO2By a second CO2Collecting line 94 into the CO2Collecting box 30, then opening nineteenth valve 39 and fifteenth valve 34, the product gas enters heat exchange tube bundle 26 in gas cooling device 27 for further cooling, and first CO removal is utilized2First CO in inner Shell of Unit 82CO adsorption in solid amine sorbent 832Then the twentieth valve 40 is opened to send the purified product gas to the ammonia supply main pipe through the first inner shell product gas outlet pipe 82;
finally, the ammonia supply main pipe removes water vapor and CO2The product gas is sent to a subsequent denitration system.
The utility model solves the problems of blockage, corrosion and high-temperature heat tracing and heat preservation in the process of transporting the air pipeline of the urea hydrolysis ammonia production product, and simultaneously purifies the product gas and effectively removes the vapor and CO in the product gas2Wherein gaseous desiccant and CO are used2The solid amine sorbent can realize cyclic utilization, so that the system can operate efficiently, economically and reasonably.
In conclusion, when the utility model is adopted to purify the urea hydrolysis product gas, comprising,
the product gas generated in the urea hydrolysis reactor 1 enters a product gas heat tracing pipeline 3 through a product gas outlet 2;
the product gas enters a dehydration inner shell of the dehydration unit from a product gas inlet pipeline, and the water vapor in the product gas enters a gas desiccant in the dehydration inner shell;
the dehydrated product gas enters the first CO removal pipeline through the product gas outlet pipeline, the dehydrated product gas pipeline 21 and the first shell product gas inlet pipeline 812Absorption shell of unit 8 for desorbing first CO by using high temperature characteristic of product gas2CO adsorbed by solid amine sorbent 832(ii) a The product gas after heat release enters the gas cooling device 27 through the first outer shell product gas outlet pipeline 86 for heat exchange, and enters the second CO removal device through the second inner shell product gas inlet pipeline 95 after further temperature reduction2Inner shell of absorption of unit 9, in which CO is contained2Is treated with a second CO2 Solid amine sorbent 93, and then the product gas enters the ammonia supply mother pipe through a second inner shell product gas outlet pipeline 92;
removal of water vapour and CO2The product gas is sent to the denitration area through an ammonia supply main pipe.
Wherein the content of the first and second substances,
when the system operates, one dehydration unit is started through the corresponding control valve, when the humidity measuring instrument measures that the humidity of gas in the pipeline does not meet the requirement, the running dehydration unit is closed through the corresponding control valve, and the other dehydration unit is started; simultaneously starting the corresponding electric heating components to dry the gas drying agent in the dehydration unit which stops running; in the drying operation process, the removed water vapor is discharged into the water vapor condensation box 15 through the water vapor outlet pipeline;
when the system is running, the second CO2CO measured by the detector 332When the standard exceeds the standard, the product gas is guided to enter the second CO removal mode by controlling the corresponding valve2Within the outer shell of the unit 9, to the second CO within its inner shell2 Solid amine sorbent 93 for CO2Desorption, then the product gas enters the first CO removal2Inner shell of unit 8, first CO therein2 Solid amine sorbent 83 for C in product gasO2Carrying out adsorption; desorbed CO2Is collected in CO2In the collection tank 30.

Claims (8)

1. A urea hydrolysis product gas purification system is characterized by comprising a urea hydrolysis reactor (1), a dehydration device and CO which are sequentially connected2An absorption desorption device and an ammonia supply main pipe;
a product gas outlet (2) and a product gas heat tracing pipeline (3) are sequentially arranged on the urea hydrolysis reactor (1);
the dehydration device comprises at least two dehydration units which are arranged in parallel; the dehydration unit comprises a dehydration outer shell and a dehydration inner shell; a gap is arranged between the dehydration outer shell and the dehydration inner shell, and an electric heating assembly is arranged in the gap; a gas drying agent is arranged in the dehydration inner shell, and a product gas inlet pipeline, a product gas outlet pipeline and a water vapor outlet pipeline are connected and arranged on the side wall of the dehydration inner shell; the product gas inlet pipelines of the two dehydration units are respectively connected with the product gas heat tracing pipeline (3), and the product gas outlet pipelines are connected with the input end of the dehydrated product gas pipeline (21) after confluence;
the CO is2The absorption and desorption device comprises two devices for removing CO2Unit and two CO removal2Gas cooling means (27) between the units; the removal of CO2The unit comprises an absorption outer shell, an absorption inner shell and a gas channel formed between the absorption outer shell and the absorption inner shell; two CO removal2The gas channels of the units are respectively communicated with the output end of a dehydrated product gas pipeline (21), and two CO removing pipelines2The gas channels of the units are respectively connected with a gas cooling device (27) and then are removed with CO with another2The absorption inner shells of the units are communicated; two CO removal2The absorption inner shells of the units are respectively communicated with the ammonia supply mother pipe through corresponding inner shell product gas outlet pipelines, and the two absorption inner shells are used for removing CO2CO is arranged in the absorption inner shell of the unit2Solid amine sorbent, two for CO removal2The absorption inner shells of the units are also respectively provided with CO2And collecting the outlet pipeline.
2. Urea according to claim 1The hydrolysis product gas purification system is characterized in that the dehydration unit further comprises a temperature measuring instrument (10), a humidity measuring instrument and a valve which are arranged on the pipeline; the removal of CO2The unit further comprises a CO arranged on the pipeline2Detector and valve.
3. The system of claim 1, wherein an isolation steel plate is horizontally disposed in the inner dewatering shell; one end of the isolation steel plate is connected with the side wall of the dehydration inner shell, and the gas desiccant arrangement area is divided into a gas inlet area and a gas outlet area.
4. The system of claim 3, wherein a desiccant spacer screen is vertically disposed in the inner dehydration shell, the desiccant spacer screen is connected to the spacer steel plate and the sidewall of the inner dehydration shell, and the gas desiccant is disposed in a receiving space surrounded by the desiccant spacer screen.
5. A urea hydrolysis product gas cleaning system as claimed in claim 1, wherein said water removal unit further comprises a water vapour condensation tank (15); the steam condensation box (15) is connected with a steam outlet pipeline.
6. The system of claim 1, wherein the dehydration unit is a box type, and an electric heating component in a shape of a Chinese character 'hui' is arranged in a gap between the outer dehydration shell and the inner dehydration shell.
7. The urea hydrolysis product gas cleanup system of claim 1, wherein said CO is CO2The absorption and desorption device also comprises CO2A collection tank (30); the CO is2A collection tank (30) and a first CO2A collection inlet pipe (84) and a second CO2The collection inlet conduit (94) is connected.
8. A urea hydrolysis product gas cleaning system as claimed in claim 1, characterized in that said gas cooling device (27) is of the water cooling type, internally provided with a heat exchange tube bundle (26) as a heat release circuit, externally provided with a demineralized water inlet conduit (37) and a demineralized water outlet conduit (28).
CN202122448868.6U 2021-10-11 2021-10-11 Urea hydrolysis product gas purification system Withdrawn - After Issue CN215924414U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113788484A (en) * 2021-10-11 2021-12-14 西安热工研究院有限公司 Urea hydrolysis product gas purification system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113788484A (en) * 2021-10-11 2021-12-14 西安热工研究院有限公司 Urea hydrolysis product gas purification system and method

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