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A urea pyrolysis reactor applied to scr denitrification

A pyrolysis reactor and reactor technology, applied in chemical/physical/physical-chemical nozzle reactors, ammonia preparation/separation, chemical instruments and methods, etc. Solve problems such as reducing height, reducing resistance, and facilitating mixing

Active Publication Date: 2015-09-09
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet because used ammonium bicarbonate is solid particle, in order to make described solid particle decompose and needs violent impact motion, so the hot air in the described pyrolysis furnace needs to be designed to rotate and flow, and the hot air inlet is set at pyrolysis The lower part of the furnace, the swirling air flow at the lower part ensures that the solid particles do not fall to the ground, and the urea used in the production of ammonia from urea is a solution, which requires hot air with a stable flow rate from top to bottom, so the above-mentioned pyrolysis device for ammonium bicarbonate is not suitable for Pyrolysis of urea
[0006] The pyrolysis device for producing ammonia from urea disclosed in patent document CN201907975U includes a gas inlet, a reaction chamber with a spray gun inside, and a gas outlet. The gas inlet is arranged on the upper part of the reaction chamber, and the gas outlet is arranged on the The lower part of the reaction chamber also includes a sieve-type air distribution device arranged inside the reaction chamber and on the upper part of the spray gun, and a sieve-type air distribution device with a plurality of openings is arranged inside the reaction chamber and on the upper part of the spray gun, In the diffusion process of the hot air entering the pyrolysis device, a uniform downward flow of hot air flow field is obtained faster, and the relative arrangement position of the spray gun is improved, so that the pyrolysis device has a shorter length requirement, effectively reducing the The height of the pyrolysis device, however, the airflow must enter through the orifice plate with many fine holes, the resistance is very large, which will cause pressure loss

Method used

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  • A urea pyrolysis reactor applied to scr denitrification
  • A urea pyrolysis reactor applied to scr denitrification
  • A urea pyrolysis reactor applied to scr denitrification

Examples

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Embodiment 1

[0031] Such as figure 1 , figure 2 and image 3 As shown, a urea pyrolysis reactor for SCR denitrification includes a reactor body 4, an inlet section 1 of hot air, an amplification section 2, and an injector 3 installed on the reactor body 4 to provide atomized urea solution , contraction section 5, outlet section 6 of mixed gas, reactor body 4 is a reactor with a certain volume, inlet section 1 is arranged on the top of reactor body 4 and communicates with reactor body 4 through amplifying section 2, amplifying section 2. The cross-sectional area gradually increases from the lower part of the inlet section 1 to the upper part of the reactor body 4. The outlet section 6 is arranged at the lower part of the reactor body 4 and communicates with the reactor body 4 through the constriction section 5. The constriction section 5 is formed by the reactor body. The cross-sectional area from the lower part of the main body 4 to the upper part of the outlet section 6 increases gradu...

Embodiment 2

[0045] In the urea pyrolysis reactor for SCR denitrification described in this embodiment, a swirl device is provided in the amplification section 2, and the swirl device is a counter-rotating plate 7 with a spiral structure, and the counter-rotating plate 7 is arranged in the amplification section 2 , the two side ends 71, 72 of the different direction plate 7 are at least partly connected with the inner wall 11 of the amplifying section 2, and the different direction plate 7 of the spiral structure divides the amplifying section 2 into two symmetrical and gradually rotating channels T1 and T2 After the gas passes through T1 and T2, a swirling flow can be formed in the reactor body 4, and the different direction plate 7 is preferably welded to the inner wall of the amplifying section 2.

[0046] Different direction plate 7 and amplification section 2 have the same or different heights, preferably the upper end 73 of different direction plate 7 is flush with the upper end of am...

Embodiment 3

[0051] In the urea pyrolysis reactor used for SCR denitrification described in this embodiment, a swirl device is provided in the reactor body 4, and the swirl device is a counter-rotating plate 7 of a spiral structure, preferably an injector in the reactor body 4 The part above 3 is provided with a different direction plate 7, and the different direction plate 7 is welded to the inner wall of the reactor body 4,

[0052] The injector 3 is arranged on the middle and upper part of the reactor body 4, preferably at a position between the upper 1 / 3 and the upper 1 / 4. There is a space above the injector 3 to allow the hot air to flow evenly when it reaches the injector. If The space above the injector 3 is too small, which will cause the hot air to reach the position of the injector 3 before it is evenly dispersed, and mix with the atomized urea solution sprayed by the injector 3, so the mixing effect is poor, so the injector 3 There must be a certain space for heating air to disp...

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Abstract

Provided is a urea pyrolysis reactor applied to SCR denitration. The reactor comprises an entrance section (1), a reactor body (4) equipped with an ejector (3) and an exit section (6) which are arranged in order. The entrance section (1) and the reactor body (4) are communicated, and the exit section (6) and the reactor body (4) are communicated. The reactor is characterized in that, a rotational flow device for guiding gas rotational flow is arranged in the entrance section (1) and / or the reactor body (4), and guides hot air to form a gas flow field with rotational flow in the reactor body. The urea pyrolysis reactor achieves good mixing effects of air flows and uniform temperature distribution in the pyrolysis reactor, prolongs the reaction residence time, and is beneficial to complete pyrolysis of urea.

Description

technical field [0001] The invention relates to a urea pyrolysis reactor. Specifically, it is a urea pyrolysis reactor with a gas swirl device, good gas flow mixing effect, uniform temperature distribution, small volume, and low cost, which is applied to SCR denitrification. Background technique [0002] Nitrogen oxide (NOx) is one of the main air pollutants. With the implementation of strict environmental protection standards, the flue gas denitrification system has become one of the essential equipment for thermal power plants. Selective Catalyst Reduction (Selective Catalyst Reduction, referred to as SCR) has become the first choice of technology for power plant denitrification projects due to its high denitrification efficiency, and has been more and more widely used. There are three sources of reducing agent NH3 in SCR technology: liquid ammonia, ammonia water and urea. Urea is selected as the reducing agent, which has the characteristics of high safety, wide range of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/26C01C1/08B01D53/90B01D53/56
Inventor 彭代军周烨宋红兵
Owner DATANG ENVIRONMENT IND GRP