CN214182532U - Device for solving problem of greenhouse gas emission caused by urea catalytic hydrolysis - Google Patents
Device for solving problem of greenhouse gas emission caused by urea catalytic hydrolysis Download PDFInfo
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- CN214182532U CN214182532U CN202022857519.5U CN202022857519U CN214182532U CN 214182532 U CN214182532 U CN 214182532U CN 202022857519 U CN202022857519 U CN 202022857519U CN 214182532 U CN214182532 U CN 214182532U
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- fiber membrane
- membrane contactor
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
Abstract
The utility model discloses a solve urea catalysis hydrolysis and discharge greenhouse gas's device, including hydrolysis reactor to and the gas collector of setting in hydrolysis reactor top, hydrolysis reactor inside is provided with the heater, and gas collector's inside is provided with the defroster, and gas collector links to each other with hollow fiber membrane contactor, and fiber membrane contactor upper portion is passed through the valve and is linked to each other with the storage tank of saturated solution, links to each other with the absorbent hold up tank through the valve, and fiber membrane contactor simultaneouslyThe lower part is connected with an absorbent storage tank through a delivery pump, and the lower end of the fiber membrane contactor is provided with CO2And (4) a densimeter. Using alcamines as CO2The absorbent has the advantages of high absorption rate, convenient storage of saturated absorption liquid and high desorption rate (about 90%). The technology not only realizes CO2The trapping reduces the emission of greenhouse gases and is more beneficial to CO2The recycling of the resources is realized.
Description
Technical Field
The utility model belongs to the flue gas denitration field of power plant, concretely relates to solve urea catalysis hydrolysis emission greenhouse gas's device.
Background
CO2The emission of greenhouse gases brings disastrous influences on global climate, the control of the emission of greenhouse gases is more and more emphasized, particularly on the general debate of the seventy-five united nations meeting in the near term, Chinese leaders put forward the aim that the emission of carbon dioxide in China strives to reach the peak value 2030 years ago, strive to achieve the aim of carbon neutralization 2060 years ago, the speaking content has milestone significance, and the world marks the inflection point on the road for jointly coping with climate change. In CO2The emission aspect is mainly the coal-fired power plant, but part of the industrial process involves CO2Should also draw sufficient attention to effectively contain CO2Drainage has been at hand at the present time. The urea catalytic hydrolysis process belongs to a kind of industrial process for producing greenhouse gases, and most of the existing technologies for urea catalytic hydrolysis are ammonia gas and CO produced by urea catalytic hydrolysis2Introducing into ammonia/air mixer together, neglecting greenhouse gas CO2The problem of discharge.
In the problem of generating greenhouse gases by catalytic hydrolysis of urea, only one patent of 'a urea hydrolysis device' (CN 201721409368.9) relates to the solution of the problem, but the technology has the following disadvantages: 1. the technology takes calcium hydroxide particles as CO2Absorbent, gaseous CO2It is firstly adsorbed on the surface of solid calcium hydroxide and then reaction is carried outAnd the mass transfer between the solid phase and the solid phase is slow, so that the absorption rate of the calcium hydroxide is slow. The carbon dioxide reacts with the calcium hydroxide to generate calcium carbonate, and if the carbon dioxide is required to be reused, the desorption and regeneration of the carbon dioxide are difficult; 2. the technology utilizes the calcium hydroxide solid to absorb CO contained in the hydrolysis generated gas at the same time2And steam, in which case the steam and CO in the mixture will be reduced simultaneously2The rate of absorption by calcium hydroxide; 3. CO introduced by this technique2The structure of the absorption device is complicated. Other traditional CCS technologies mostly adopt alcohol amine absorbent combined with traditional chemical equipment such as packed tower and plate tower to treat CO2The problems of high desorption energy consumption, low mass transfer equipment efficiency, poor absorbent performance and the like in the process of absorption and trapping can not be well solved all the time.
In the catalytic hydrolysis process of urea, urea and water react and decompose under the action of a catalyst to generate ammonia gas and greenhouse gas CO2(mass fraction was about 56.4%). Most of the existing reactors for producing ammonia by urea catalytic hydrolysis utilize urea to hydrolyze under high temperature condition, and CO generated by reaction2And the urea is directly released into the atmosphere, and the urea catalytic hydrolysis technology finally aggravates the greenhouse effect of the earth and seriously influences the living conditions of the earth organisms.
SUMMERY OF THE UTILITY MODEL
To solve the problem, the utility model discloses a solve urea catalysis hydrolysis and discharge greenhouse gas's device to alcamines chemical reagent is as CO2The absorbent has the advantages of high absorption rate, convenient storage of saturated absorption liquid and high desorption rate (about 90%). The technology not only realizes CO2The trapping reduces the emission of greenhouse gases and is more beneficial to CO2The recycling of the resources is realized.
The utility model discloses a realize through following technical scheme:
the device for solving the problem of greenhouse gas emission in urea catalytic hydrolysis comprises a hydrolysis reactor and a device arranged in the hydrolysis reactionThe gas collector of ware top, hydrolysis reactor is inside to be provided with the heater, and the inside of gas collector is provided with the defroster, and the gas collector links to each other with hollow fiber membrane contactor, and fiber membrane contactor upper portion links to each other through the storage tank of valve with saturated solution, links to each other through valve and absorbent storage tank, and fiber membrane contactor lower part links to each other with the absorbent storage tank through the delivery pump simultaneously, and the lower extreme of fiber membrane contactor is provided with CO2And (4) a densimeter.
Preferably, the hollow fiber membrane contactor comprises hollow fiber membrane filaments, the number of the fiber membranes is 1000-2000, the length is 1-1.5 m, the filling rate is 20% -50%, and the membrane filaments are made of polytetrafluoroethylene.
A method for solving greenhouse gas emission in urea catalytic hydrolysis comprises the steps of adding a urea solution and a catalyst at the bottom end of a hydrolysis reactor, installing a heater in the hydrolysis reactor, and hydrolyzing the urea solution at 130-160 ℃ and 0.4-0.6 Mpa under the action of the catalyst and the heating to generate NH3、CO2The generated gas rises to the upper part of the hydrolysis reactor together with the water vapor and enters a gas collector, and the water vapor is removed after the mixed gas passes through a demister in the gas collector, so that only NH is left in the mixed gas3With CO2The mixed gas continuously rises and enters a hollow fiber membrane contactor to remove CO2And then to an ammonia/air mixer. The mixed gas continuously rises and enters a hollow fiber membrane contactor to remove CO2The process comprises the following steps: in a hollow fiber membrane contactor, gas passes through a tube pass, an alcohol amine absorbent is conveyed from an absorbent storage tank to a shell pass through a conveying pump, and the two phases are in countercurrent contact; CO is arranged at the gas outlet2Densitometer for monitoring CO2If the concentration increases, the absorbent is considered to be saturated; when the absorption liquid is saturated, the absorption liquid enters a storage tank of the saturated solution through a valve; if absorbing CO2If the absorbent is not saturated, the absorbent is continuously pumped into a membrane absorption device through a valve to carry out CO2Absorption of (2).
Advantageous effects
1. The utility model utilizes the membrane absorption technology to capture CO2Compared with the traditional absorption tower, the membrane absorption can independently control the gas-liquid two-phase flow velocity in a wide range, the gas-liquid contact surface is large, the energy consumption is low, and the phenomena of flooding, entrainment, channeling, bubbling and the like are avoided. In addition, the membrane absorption technology is more beneficial to CO2The CO recovered by the membrane absorption technology is reused2The purity is high and can reach more than 95 percent.
2. The utility model discloses use hydrophobic hollow fiber membrane to separate the interface for gas-liquid double-phase within a definite time, its stronger hydrophobic property can prevent the leakage of liquid phase, and used membrane material can tolerate the long-term corruption of strong acid strong base in addition, provides longer life for membrane absorption equipment. The adopted hollow fiber membrane component also has the advantages of large gas-liquid contact area, small equipment volume and the like.
3 the utility model takes alcohol amine solutions such as MEA and MDEA as the absorbent for subsequent reutilization of CO2The desorption process is relatively simple, and compared with the traditional method, the method has the advantages of low equipment investment, high separation efficiency, long service cycle and the like.
4. The utility model treats the back CO2The content is less than or equal to 0.3 percent, and the removal capacity reaches more than 99 percent. By the technology, the influence of urea hydrolysis on the greenhouse effect is eliminated.
5.CO2Reacts with alcohol amine absorption liquid to generate alcohol amine carbonate which is convenient to store. In the use of CO2The absorbed solution can be directly heated for desorption, and the desorption rate can reach about 90% under the condition of 90-120 ℃. The technology not only realizes CO2The capture of (2) reduces the emission of greenhouse gases and simultaneously leads CO to be discharged2Sealing and storing, and is more beneficial to CO2The recycling of the resources is realized.
Drawings
FIG. 1 is a device for solving the problem of greenhouse gas emission in urea catalytic hydrolysis;
in the figure, 1, a heater; 2. a gas collector; 3. a demister; 4. a fibrous membrane contactor; 5. an absorbent storage tank; 6. a delivery pump; 7. CO 22A densitometer; 8. a valve; 9. a storage tank; 11. a hydrolysis reactor.
Detailed Description
The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
The utility model provides a solve urea catalytic hydrolysis and discharge greenhouse gas's device, including hydrolysis reactor 11, and set up the gas collector 2 in hydrolysis reactor 11 top, hydrolysis reactor 11 is inside to be provided with heater 1, gas collector's inside is provided with defroster 3, gas collector 2 links to each other with hollow fiber membrane contactor 4, 4 upper portions of fiber membrane contactor link to each other with saturated solution's storage tank 9 through valve 8, link to each other with absorbent storage tank 5 through valve 8, 4 lower parts of fiber membrane contactor link to each other with absorbent storage tank 5 through delivery pump 6 simultaneously, the lower extreme of fiber membrane contactor 4 is provided with CO2And a densitometer 7. The hollow fiber membrane contactor 4 comprises hollow fiber membrane filaments, the number of the fiber membranes is 1000-2000, the length is 1-1.5 m, the filling rate is 20% -50%, and the membrane filaments are made of polytetrafluoroethylene.
A method for solving greenhouse gas emission in urea catalytic hydrolysis comprises the steps of adding a urea solution and a catalyst at the bottom end of a hydrolysis reactor 11, installing a heater 1 in the hydrolysis reactor 11, and hydrolyzing the urea solution at 130-160 ℃ and 0.4-0.6 Mpa under the action of the catalyst and heating to generate NH3、CO2The generated gas rises to the upper part of the hydrolysis reactor together with the water vapor and enters a gas collector 2, and the water vapor is removed after the mixed gas passes through a demister 3 in the gas collector, so that only NH is left in the mixed gas3With CO2The mixed gas rises continuously and enters the hollow fiber membrane contactor 4 to remove CO2And then to an ammonia/air mixer.
The mixed gas continuously rises and enters a hollow fiber membrane contactor 4 to remove CO2The process comprises the following steps: in the hollow fiber membrane contactor 4, gas passes through the tube pass, the alcohol amine absorbent is conveyed to the shell pass from the absorbent storage tank 5 through the conveying pump 6, and two phases are in countercurrent contact(ii) a CO is arranged at the gas outlet2Densitometer 7 for monitoring CO2If the concentration increases, the absorbent is considered to be saturated; when the absorption liquid is saturated, the absorption liquid enters a storage tank 9 of saturated solution through a valve 8; if absorbing CO2If the absorbent is not saturated, the absorbent is continuously pumped into the membrane absorption device through the valve 8 to carry out CO absorption2Absorption of (2).
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. The utility model provides a solve urea catalytic hydrolysis and discharge greenhouse gas's device, including hydrolysis reactor (11), and gas collector (2) of setting in hydrolysis reactor (11) top, hydrolysis reactor (11) inside is provided with heater (1), gas collector's inside is provided with defroster (3), a serial communication port, gas collector (2) link to each other with hollow fiber membrane contactor (4), fiber membrane contactor (4) upper portion links to each other with storage tank (9) of saturated solution through valve (8), link to each other with absorbent storage tank (5) through valve (8), fiber membrane contactor (4) lower part links to each other with absorbent storage tank (5) through delivery pump (6) simultaneously.
2. The device for solving the problem of greenhouse gas emission caused by urea catalytic hydrolysis as claimed in claim 1, wherein the hollow fiber membrane contactor (4) comprises hollow fiber membrane filaments, the number of the fiber membranes is 1000-2000, the length is 1-1.5 m, the filling rate is 20% -50%, and the membrane filaments are made of polytetrafluoroethylene.
3. The device for solving the greenhouse gas emission problem of urea catalytic hydrolysis according to claim 1, characterized in that the lower end of the fiber membrane contactor (4) is provided with CO2Densimeter (7)）。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022857519.5U CN214182532U (en) | 2020-12-02 | 2020-12-02 | Device for solving problem of greenhouse gas emission caused by urea catalytic hydrolysis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022857519.5U CN214182532U (en) | 2020-12-02 | 2020-12-02 | Device for solving problem of greenhouse gas emission caused by urea catalytic hydrolysis |
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| CN214182532U true CN214182532U (en) | 2021-09-14 |
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| CN202022857519.5U Active CN214182532U (en) | 2020-12-02 | 2020-12-02 | Device for solving problem of greenhouse gas emission caused by urea catalytic hydrolysis |
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