CN111963283A - Novel urea hydrolysis system with product gas treatment device and application - Google Patents
Novel urea hydrolysis system with product gas treatment device and application Download PDFInfo
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- CN111963283A CN111963283A CN202010799968.0A CN202010799968A CN111963283A CN 111963283 A CN111963283 A CN 111963283A CN 202010799968 A CN202010799968 A CN 202010799968A CN 111963283 A CN111963283 A CN 111963283A
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- product gas
- urea
- urea solution
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- urea hydrolysis
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000004202 carbamide Substances 0.000 title claims abstract description 88
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 45
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000009833 condensation Methods 0.000 claims abstract description 40
- 230000005494 condensation Effects 0.000 claims abstract description 40
- 238000003303 reheating Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 107
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 22
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 3
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a novel urea hydrolysis system with a product gas treatment device, which comprises a urea hydrolysis reactor, a demister, a product gas reheating device, a product gas condensation water return device and a condensation water tank, wherein the urea hydrolysis reactor is communicated with and provided with a product gas outlet and a urea solution inlet, the product gas outlet is tightly connected with the urea hydrolysis reactor through the demister, the product gas reheating device is arranged in the urea hydrolysis reactor, and the product gas reheating device is provided with a product gas reheating device outlet and a product gas reheating device inlet. The whole condensation water return device and the reheating device of the system do not consume extra energy, and the water consumption for preparing the urea solution is saved. The reheated gas mixture has higher temperature and does not generate reverse reaction. The system saves water, reduces consumption and is safe and stable in operation.
Description
Technical Field
The invention belongs to the technical field of environmental protection, relates to a reducing agent preparation device for flue gas denitration, and particularly relates to a novel urea hydrolysis system with a product gas treatment device and application thereof.
Background
With the continuous improvement of the environmental protection requirement, the emission concentration of the atmospheric pollutants meets the ultra-low emission standard, and the treatment efficiency of the nitrogen oxides is generally required to be about 90%, so that the Selective Catalytic Reduction (SCR) method becomes the most common denitration process. The reducing agents in the SCR process are three, namely liquid ammonia, urea and ammonia water. Wherein, the denitration operation cost of the liquid ammonia method is the lowest, the urea is the second time, and the ammonia water is the most expensive.
At present, more than 85% of domestic SCR flue gas denitration adopts liquid ammonia as a reducing agent. However, liquid ammonia is a dangerous chemical class B, serious potential safety hazards exist, national energy safety No. [2017]65 requires that the safety supervision of dangerous chemicals is comprehensively strengthened in 2017-2019, and the national regulations are rectified and improved. Ammonia risks are lower than liquid ammonia, but transportation costs are large. The reducing agent is decomposed by urea, is safe and nontoxic, and is easy to store. Therefore, more and more projects for changing liquid ammonia into urea hydrolysis in SCR denitration in China are provided.
The urea hydrolysis ammonia production process is to utilize steam to indirectly heat 40-60% urea solution through a steam coil to react, and the urea can be hydrolyzed into ammonia gas, carbon dioxide and water vapor. The product gas at the outlet of the hydrolysis reactor is a mixed gas of three gases, the temperature is 140-160 ℃, and the vapor of the mixed gas at the temperature below 133 ℃ can generate condensation, so that reverse reaction is carried out to generate ammonium carbamate. The ammonium carbamate formed is a white crystal and can block pipes or equipment.
Therefore, it is necessary to design a treatment device for the product gas at the outlet of the urea hydrolysis device.
Through searching, no patent publication related to the present patent application has been found.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a novel urea hydrolysis system with a product gas treatment device and application thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a novel urea hydrolysis system with a product gas treatment device comprises a urea hydrolysis reactor, a demister, a product gas reheating device, a product gas condensation and water return device and a condensation water tank, wherein the urea hydrolysis reactor is communicated with and provided with a product gas outlet and a urea solution inlet;
the input end of the product gas condensation backwater device comprises a product gas shell pass input end and a urea solution inlet, the output end of the product gas condensation backwater device comprises a product gas shell pass output end, a urea solution outlet and a condensed water outlet, the output end of the product gas outlet is tightly connected with the product gas shell pass input end of the product gas condensation backwater device, and the product gas shell pass output end is tightly connected with the product gas reheating device inlet;
the urea solution inlet of the product gas condensation backwater device can be tightly connected with the output end of a urea solution storage tank, the urea solution storage tank can output a urea solution for reaction, and the urea solution outlet of the product gas condensation backwater device is tightly connected with the urea solution inlet of a urea hydrolysis reactor;
the condensed water outlet is connected with the input end of the condensed water tank;
the outlet of the product gas reheating device can be closely connected with an ammonia spraying device.
Moreover, the demister is a pneumatic demister.
Also, the pneumatic mist eliminator includes a plurality of swirl plates.
And the product gas condensation water return device is an external heat exchanger.
Moreover, the product gas reheating device is a built-in heat exchanger.
The novel urea hydrolysis system with the product gas treatment device is applied to the aspect of flue gas denitration.
The invention has the advantages and effects that:
1. the system is provided with a product gas treatment device which is divided into three stages, so that liquid water and gaseous water in the product gas can be removed without increasing extra energy consumption. The heat dissipated during condensation is used to heat the urea solution. The urea hydrolysis product gas after water removal is heated, so that side reaction can not occur, and the phenomenon of equipment and pipeline blockage can not occur. The system improves the reliability and stability of the supply of the reducing agent in the flue gas denitration process, and can be widely applied to the flue gas denitration process.
2. The system of the invention carries out three-stage treatment on the product mixed gas after the hydrolysis reaction. The method comprises the following steps of firstly, pneumatically removing liquid water in product gas by a demister, condensing and reheating the liquid water, condensing water vapor in mixed gas, avoiding side reaction, and heating urea solution by using heat released by water vapor condensation. The whole condensation water return device and the reheating device of the system do not consume extra energy, and the water consumption for preparing the urea solution is saved. The reheated gas mixture has higher temperature and does not generate reverse reaction. The system saves water, reduces consumption and is safe and stable in operation.
Drawings
FIG. l is a schematic diagram of a structural connection of the urea hydrolysis system of the present invention;
FIG. 2 is a schematic illustration of a planar structural connection of the mist eliminator of FIG. 1.
Detailed Description
The present invention will be further described with reference to specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The raw materials used in the invention are conventional commercial products unless otherwise specified; the methods used in the present invention are conventional in the art unless otherwise specified.
A novel urea hydrolysis system with a product gas treatment device is shown in figure 1, and comprises a urea hydrolysis reactor 1, a demister 3, a product gas reheating device 4, a product gas condensation water return device 6 and a condensation water tank 10, wherein the urea hydrolysis reactor is communicated with a product gas outlet 2 and a urea solution inlet 9, the product gas outlet is tightly connected with the urea hydrolysis reactor through the demister, the product gas reheating device is arranged in the urea hydrolysis reactor, and the product gas reheating device is provided with a product gas reheating device outlet 5 and a product gas reheating device inlet 11;
the input end of the product gas condensation backwater device comprises a product gas shell pass input end 12 and a urea solution inlet 7, the output end of the product gas condensation backwater device comprises a product gas shell pass output end 13, a urea solution outlet 8 and a condensed water outlet 14, the output end of the product gas outlet is tightly connected with the product gas shell pass input end of the product gas condensation backwater device, and the output end of the product gas shell pass is tightly connected with the product gas reheating device inlet;
a urea solution inlet of the product gas condensation and water return device can be tightly connected with an output end of a urea solution storage tank (not shown in the figure), the urea solution storage tank can output a urea solution for reaction, and a urea solution outlet of the product gas condensation and water return device is tightly connected with a urea solution inlet of a urea hydrolysis reactor;
the condensed water outlet is connected with the input end of the condensed water tank;
the outlet of the product gas reheating device can be closely connected with an ammonia spraying device (not shown in the figure).
And removing liquid water in the product gas generated in the urea hydrolysis reactor through a product gas outlet and a demister. The product gas without liquid water enters a condensation water return device, and exchanges heat with the urea solution from a urea solution storage tank through an inlet, the product gas leaves a shell side, the urea solution leaves a tube side, vapor in the product gas is condensed at the shell side of the condensation water return device to be condensed into liquid water, and the liquid water enters a condensation water tank by virtue of gravity, and the part of the water can be used for preparing the urea solution. The heated urea solution enters a urea solution inlet of the hydrolysis reactor.
And the product gas after the gaseous water is removed by condensation enters a product gas reheating device arranged in the hydrolysis reactor to be heated, and the anhydrous product gas after the heating is sent to an ammonia spraying device.
In the present embodiment, as shown in fig. 2, the demister is a pneumatic demister.
Preferably, the pneumatic demister comprises a plurality of swirl plates 31, and the mixture gas is rotated and collided under the action of pneumatic force, so that small liquid drops are agglomerated into large liquid drops and centrifugally move outwards to return to the urea hydrolysis reactor. This configuration effectively removes all liquid water droplets from the product gas.
In this embodiment, the product gas condensation water return device is an external heat exchanger, the product gas passes through a shell pass, the urea solution passes through a tube pass, the heated urea solution enters the urea hydrolysis reactor, and the condensed mixed gas enters the reheating device.
In this embodiment, the product gas reheating device is a built-in heat exchanger, and is placed inside the hydrolysis reactor, and the tube pass is a product mixed gas containing no water vapor after condensation, and exchanges heat with the non-condensed mixed gas on the upper part of the hydrolysis reactor, so as to pre-condense the non-condensed mixed gas.
One working principle of the novel urea hydrolysis system with the product gas treatment device is as follows:
the system comprises a urea hydrolysis reactor, a demister, a condensate return device of product gas, a product gas reheating device and a condensate water tank, and the system carries out three-stage treatment on the product gas. The urea solution absorbs heat and hydrolyzes to generate mixed gas of ammonia gas, carbon dioxide and water vapor, the mixed gas is firstly removed of carried liquid drops through a demister, then is removed of the water vapor through a condensation water return device, and then enters a reheating device for heating, and the heated mixed gas is used by an ammonia spraying system. The urea solution is preheated by heat released by cooling of the high-temperature mixed gas and condensation of water vapor, and the cooled mixed gas is reheated by a reheating device in the hydrolysis reactor, so that the low-temperature mixed gas is prevented from generating ammonium carbamate through reverse reaction. And condensing the water vapor in the mixed gas, and then automatically flowing into a condensation water tank for preparing the urea solution. The whole condensation water return device and the reheating device do not consume extra energy, and the water consumption for preparing the urea solution is saved. The reheated gas mixture has higher temperature and does not generate reverse reaction. The equipment saves water, reduces consumption and has safe and stable operation.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.
Claims (6)
1. The utility model provides a take product gas processing apparatus's novel urea system of hydrolysising which characterized in that: the system comprises a urea hydrolysis reactor, a demister, a product gas reheating device, a product gas condensation and water return device and a condensation water tank, wherein the urea hydrolysis reactor is communicated with and provided with a product gas outlet and a urea solution inlet;
the input end of the product gas condensation backwater device comprises a product gas shell pass input end and a urea solution inlet, the output end of the product gas condensation backwater device comprises a product gas shell pass output end, a urea solution outlet and a condensed water outlet, the output end of the product gas outlet is tightly connected with the product gas shell pass input end of the product gas condensation backwater device, and the product gas shell pass output end is tightly connected with the product gas reheating device inlet;
the urea solution inlet of the product gas condensation backwater device can be tightly connected with the output end of a urea solution storage tank, the urea solution storage tank can output a urea solution for reaction, and the urea solution outlet of the product gas condensation backwater device is tightly connected with the urea solution inlet of a urea hydrolysis reactor;
the condensed water outlet is connected with the input end of the condensed water tank;
the outlet of the product gas reheating device can be closely connected with an ammonia spraying device.
2. The novel urea hydrolysis system with product gas treatment device according to claim 1, characterized in that: the demister is a pneumatic demister.
3. The novel urea hydrolysis system with product gas treatment device according to claim 2, characterized in that: the pneumatic demister comprises a plurality of swirl plates.
4. The novel urea hydrolysis system with product gas treatment device according to claim 1, characterized in that: the product gas condensation water return device is an external heat exchanger.
5. The novel urea hydrolysis system with product gas treatment device according to any one of claims 1 to 4, characterized in that: the product gas reheating device is a built-in heat exchanger.
6. Use of a novel urea hydrolysis system with a product gas treatment device according to any one of claims 1 to 5 for flue gas denitration.
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| CN202010799968.0A CN111963283A (en) | 2020-08-11 | 2020-08-11 | Novel urea hydrolysis system with product gas treatment device and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010799968.0A CN111963283A (en) | 2020-08-11 | 2020-08-11 | Novel urea hydrolysis system with product gas treatment device and application |
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Cited By (2)
| 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 |
| CN114984669A (en) * | 2022-06-23 | 2022-09-02 | 西安西热锅炉环保工程有限公司 | Novel urea hydrolyzer export defogging device |
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| CN210438425U (en) * | 2019-07-16 | 2020-05-01 | 中国华电科工集团有限公司 | Urea hydrolysis ammonia production reaction unit |
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| CN212716833U (en) * | 2020-08-11 | 2021-03-16 | 航天环境工程有限公司 | Novel urea hydrolysis system with product gas treatment device |
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2020
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| CN201959720U (en) * | 2011-02-15 | 2011-09-07 | 成都锐思环保工程有限公司 | Ammonia making reactor for flue gas denitrification and nitrogen urea solution hydrolyzation |
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Cited By (2)
| 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 |
| CN114984669A (en) * | 2022-06-23 | 2022-09-02 | 西安西热锅炉环保工程有限公司 | Novel urea hydrolyzer export defogging device |
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