CN216825656U

CN216825656U - Device for linkage of synthetic ammonia and flue gas denitration

Info

Publication number: CN216825656U
Application number: CN202220459334.5U
Authority: CN
Inventors: 吴吉; 付国; 吴德礼; 胡云凯; 易昌国; 胡安旭
Original assignee: Guizhou Chitianhua Tongzi Chemical Co ltd
Current assignee: Guizhou Chitianhua Tongzi Chemical Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-06-28
Anticipated expiration: 2032-03-04

Abstract

The utility model discloses a device for linkage of synthetic ammonia and flue gas denitration, which comprises a gas mixer, wherein the gas mixer is respectively connected with a gas ammonia pipeline and a dilution fan of a synthetic ammonia unit in an ammonia alcohol workshop, and the dilution fan is provided with an air inlet; a pressure stabilizing valve, a regulating valve and a flowmeter I are arranged on a pipeline between the gas mixer and the synthetic ammonia unit, and a flowmeter II is arranged on a pipeline between the dilution fan and the gas mixer; the gas mixer is connected with the SCR denitration device through a front smoke pipeline; the utility model discloses can combine the mode that synthetic ammonia device prepared rare ammonia on line to satisfy the denitration.

Description

Device for linkage of synthetic ammonia and flue gas denitration

Technical Field

The utility model relates to a device of synthetic ammonia and flue gas denitration linkage belongs to synthetic ammonia and flue gas denitration linkage instrument field.

Background

At present, an SCR (selective catalytic reduction) denitration device is generally adopted in a large coal-fired power plant to reduce the emission concentration of NOx in flue gas. SCR utilizes the reduction characteristics of NH3 on NOx to reduce NOx to environmentally benign N2 and H2O under the action of a catalyst.

In the actual operation process, the control of ammonia injection amount is particularly critical, on one hand, the total ammonia injection amount is required to be reasonably controlled, and on the other hand, the ammonia injection uniformity (mainly, the ammonia nitrogen molar ratio is relatively uniform) is required to be ensured so as to ensure that the NOx emission concentration reaches the standard within the allowable ammonia escape rate range.

The development of the ammonia injection reducing agent is diluted ammonia water → diluted gas ammonia → urea, and due to the difference of various industry fields, the selection of the reducing agent is different by combining the conditions of various enterprises. The urea is adopted as a reducing agent, which is popular at present because the substance does not form a key hazard source, but ammonia separated by a urea hydrolysis and evaporation device is diluted and then reacts with NOx in an SCR denitration device to reduce NOx in smoke. However, the urea hydrolysis denitration has the problems of large investment and high cost, can be used only in outsourcing urea power plants, and is not suitable for enterprises with ammonia synthesis devices.

Namely: the existing device for linkage of synthetic ammonia and flue gas denitration can be combined with a synthetic ammonia device, and the mode of online preparation of dilute ammonia gas by using local materials is needed, so that denitration is met.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a device for linkage of synthetic ammonia and flue gas denitration, which can combine with a synthetic ammonia device to prepare dilute ammonia gas on line by using local materials, thereby satisfying denitration; the defects of the prior art can be overcome.

The technical scheme of the utility model is that: a device for linkage of synthetic ammonia and flue gas denitration comprises a gas mixer, wherein the gas mixer is respectively connected with a gas ammonia pipeline and a dilution fan of a synthetic ammonia unit in an ammonia-alcohol plant, and the dilution fan is provided with an air inlet; a pressure stabilizing valve, a regulating valve and a flowmeter I are arranged on a pipeline between the gas mixer and the synthetic ammonia unit, and a flowmeter II is arranged on a pipeline between the dilution fan and the gas mixer; the gas mixer is connected with the SCR denitration device through a front smoke pipeline.

And a pure ammonia gas supplementing pipeline is arranged on a pipeline between the gas mixer and the synthetic ammonia unit.

The wind delivery pipe of the dilution fan is provided with a check valve and a butterfly valve.

Compared with the prior art, the utility model discloses device of synthetic ammonia and flue gas denitration linkage has following beneficial effect:

(1) the utility model discloses the focus is on selecting the mode of preparing rare ammonia on line with low costs, "local materials", can overcome traditional weak ammonia and prepare not enough of technique.

(2) Compared with the original dilute ammonia water as a reducing agent, the method for preparing the dilute ammonia gas on line overcomes the problems that the concentration of the originally prepared dilute ammonia water fluctuates greatly, the dilute ammonia water is sprayed into a denitration reactor unevenly, flue gas carries water and the like.

(3) The mode of dilute ammonia gas replaces the original system and adopts spray gun atomization, and the more favorable ammonia gas and the even mixing of flue gas.

(4) The denitration reducing agent selection relation device has the problems of stable operation and operation cost. If liquid ammonia is used as a reducing agent, an ammonia evaporation device needs to be added, so that the investment is large and the operation cost is high; if urea is used as a reducing agent, a urea hydrolysis device needs to be added, and the flue gas is required to provide hydrolysis heat, so that heat loss in the flue gas is caused, higher operation cost is generated, and the urea which is not hydrolyzed completely directly enters furnace dust to influence the quality of the dust; the use of ammonia as the reducing agent has the aforementioned problems. By adopting gas ammonia as a reducing agent through careful analysis, the problems of stability and cost can be solved. The ammonia cooling system of the ammonia synthesis device contains a lot of gas ammonia, and part of the gas ammonia is led to the denitration device through a pipeline, so that the stability of the boiler can be ensured, and the cost of steam consumption of ammonia compression in a chemical device can be reduced.

Drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of the connection structure of the present invention.

Wherein, the gas mixer 1; a gas ammonia line 2; a dilution fan 3; a pressure maintaining valve 4; an adjusting valve 5; a flowmeter I6; a front smoke duct 7; a flow meter II 8; the pure ammonia gas makes up the line 9.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for purposes of illustration only and are not intended to limit the scope of the present invention.

Embodiment 1. as shown in fig. 1, a device for linkage of synthetic ammonia and flue gas denitration comprises a gas mixer 1, wherein the gas mixer 1 is respectively connected with a gas ammonia pipeline 2 and a dilution fan 3 of an ammonia and alcohol plant synthetic ammonia unit, the dilution fan 3 is provided with an air inlet, and the dilution fan 3 is provided with a plurality of check valves and butterfly valves on air conveying pipes of the dilution fan 3; a pressure stabilizing valve 4, a regulating valve 5 and a flowmeter I6 are arranged on a pipeline between the gas mixer 1 and the synthetic ammonia unit, and a flowmeter II 8 is arranged on a pipeline between the dilution fan 3 and the gas mixer 1; the gas mixer 1 is connected with the SCR denitration device through the front flue pipe 7, so that ammonia diluted by the gas mixer 1 is connected into the front flue of the SCR denitration device and is fully mixed with the flue gas through the internal spin mixer in the SCR denitration device, and the ammonia is diluted and then reacts with NOx in the SCR denitration device to reduce NOx in the flue gas.

A pure ammonia gas supplementing pipeline 9 is arranged on a pipeline between the gas mixer 1 and the synthetic ammonia unit, and the pure ammonia gas supplementing pipeline 9 is connected with the pure ammonia gas storage tank.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a device of synthetic ammonia and flue gas denitration linkage, it includes gas mixer (1), its characterized in that: the gas mixer (1) is respectively connected with a gas ammonia pipeline (2) and a dilution fan (3) of an ammonia and alcohol plant ammonia synthesis unit, and an air inlet is arranged on the dilution fan (3); a pressure stabilizing valve (4), a regulating valve (5) and a flowmeter I (6) are arranged on a pipeline between the gas mixer (1) and the synthetic ammonia unit, and a flowmeter II (8) is arranged on a pipeline between the dilution fan (3) and the gas mixer (1); the gas mixer (1) is connected with the SCR denitration device through a front smoke pipeline (7).

2. The device for the linkage of ammonia synthesis and flue gas denitration according to claim 1, wherein: a pure ammonia gas supplementing pipeline (9) is arranged on a pipeline between the gas mixer (1) and the ammonia synthesis unit.

3. The device for the linkage of ammonia synthesis and flue gas denitration according to claim 1, wherein: a check valve and a butterfly valve are arranged on the air delivery pipe of the dilution fan (3).