CN212716833U - Novel urea hydrolysis system with product gas treatment device - Google Patents
Novel urea hydrolysis system with product gas treatment device Download PDFInfo
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- CN212716833U CN212716833U CN202021653820.8U CN202021653820U CN212716833U CN 212716833 U CN212716833 U CN 212716833U CN 202021653820 U CN202021653820 U CN 202021653820U CN 212716833 U CN212716833 U CN 212716833U
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Abstract
The utility model relates to a take product gas processing apparatus's novel urea system of hydrolysising, the system includes urea hydrolysis reactor, defroster, product gas reheating device, product gas condensation backwater device and condensation water tank, urea hydrolysis reactor is linked together and is provided with product gas export and urea solution import, product gas export closely is connected the setting through defroster and urea hydrolysis reactor, product gas reheating device sets up in urea hydrolysis reactor, and this product gas reheating device is provided with product gas reheating device export, product gas reheating device import. 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 utility model belongs to the technical field of the environmental protection, a flue gas denitration's reductant preparation facilities is related to, especially a take product gas processing apparatus's novel urea system of hydrolysising.
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, the patent publication documents related to the patent application of the present invention have not been found.
Disclosure of Invention
An object of the utility model is to overcome prior art's weak point, provide a take product gas processing apparatus's novel urea system of hydrolysising.
The utility model provides a technical scheme that its technical problem adopted is:
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 utility model discloses the advantage and the effect that gain are:
1. the utility model discloses the system has product gas processing apparatus, and processing apparatus divides into the tertiary, can get rid of liquid water and gaseous state water in the product gas, and does not increase 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 utility model discloses the system has improved reliability and stability of reductant supply in the flue gas denitration process, can be applied to the flue gas denitration in-process extensively.
2. The utility model discloses the system carries out tertiary treatment to the product gas mixture 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. 1 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 described in further detail with reference to specific examples, which are provided for illustrative purposes only and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
The raw materials used in the utility model are conventional commercial products if no special description is provided; the methods used in the present invention are conventional methods 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.
The utility model discloses take product gas processing apparatus's a theory of operation of novel urea system of hydrolysising 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 (5)
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.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111963283A (en) * | 2020-08-11 | 2020-11-20 | 航天环境工程有限公司 | Novel urea hydrolysis system with product gas treatment device and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111963283A (en) * | 2020-08-11 | 2020-11-20 | 航天环境工程有限公司 | Novel urea hydrolysis system with product gas treatment device and application |
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