Non-catalytic flue gas denitration equipment

Abstract

The utility model relates to non-catalytic flue gas denitration equipment which comprises a stirring tank which is connected through a pipeline, is provided with a feeding hole and a water inlet and is used for introducing a reducing agent and water to prepare a reducing agent solution; the denitration unit comprises a pump body and a liquid pouring pump, and the liquid outlet end of the pump body is connected with a flow meter; the gas tank is used for providing compressed gas, and a flow valve is arranged at the gas outlet end of the gas tank; and the reducing agent solution in the stirring tank passes through the denitration unit and then is introduced into the boiler together with the gas, so that the flue gas in the boiler is subjected to denitration treatment. Compared with the prior art, the system has the beneficial effects that the flue gas components of key nodes are detected, the operation of a kiln system is reasonably optimized, the flow pressure ratio of atomized liquid to compressed air is adjusted, a rapid and efficient denitration reaction is carried out for mixing of a reducing agent and flue gas, the temperature of a denitration area is adjusted, and the denitration efficiency is improved. The fuel combustion reaction process is controlled, and the optimization condition of the denitration reaction is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas treatment, in particular to a non-catalytic flue gas denitration device. Background Art

[0002] In the combustion flue gas of industrial production, there are often a large amount of nitrogen oxides. Directly discharging such flue gas into the atmosphere will inevitably cause harm to the environment. Flue gas denitration refers to treating the flue gas before it is discharged into the atmosphere to reduce or even remove nitrogen oxides (NOx) in the flue gas, so as to reduce the harm to the atmosphere.

[0003] SNCR, the full English name is selective non-catalytic reduction, and the Chinese name is selective non-catalytic reduction. It means that in the absence of a catalyst, a reducing agent is injected into the "temperature window" suitable for the denitration reaction to reduce nitrogen oxides in the flue gas to harmless nitrogen and water. This technology generally uses ammonia, urea or hydrocyanic acid sprayed into the furnace as a reducing agent to reduce NOx. The reducing agent only reacts with NOx in the flue gas and generally does not react with oxygen. Since this technology does not use a catalyst, this method is called selective non-catalytic reduction method (SNCR). Since this process does not use a catalyst, the reducing agent must be added in the high-temperature zone. The reducing agent is sprayed into the furnace area with a temperature of 850-1100 °C, and is quickly thermally decomposed into NH3, which reacts with NOx in the flue gas to generate N2 and water.

[0004] Due to the influence of factors such as fluctuations in coal quality conditions, unstable operating conditions, and improper operation in the boiler SNCR device, various problems exist in actual operation. For example, the concentration of the sprayed reducing agent solution, the atomized liquid, and the flow pressure ratio of compressed air, etc., make the SNCR denitration system unable to efficiently denitrate the flue gas. Summary of the Utility Model

[0005] In order to solve the above problems existing in the prior art, the utility model provides a non-catalytic flue gas denitration device.

[0006] The above problems of the utility model are solved by the following technical solutions:

[0007] A non-catalytic flue gas denitration device, including those connected by pipelines,

[0008] A stirring tank, which is provided with a feed inlet and a water inlet for introducing a reducing agent and water to prepare a reducing agent solution;

[0009] A denitration unit, including a pump body and a pouring pump, and a flow meter is connected to the liquid outlet end of the pump body;

[0010] A gas tank for providing compressed gas, and a flow valve is arranged at the gas outlet end of the gas pipe;

[0011] The reducing agent solution in the stirring tank passes through the denitration unit and then enters the boiler together with the gas, and the flue gas in the boiler is denitrated.

[0012] The further setting of the above technical solution is: a liquid storage tank is arranged between the stirring tank and the denitration unit, and a liquid level gauge is arranged in the liquid storage tank.

[0013] The further setting of the above technical solution is: the pouring pump is connected between the stirring tank and the liquid storage tank.

[0014] The further setting of the above technical solution is: an input pipeline is arranged on the boiler, and an air inlet end and a water inlet end are sequentially arranged on the input pipeline along the input direction, and are respectively connected to the gas tank and the denitration unit.

[0015] The further setting of the above technical solution is: the input end of the input pipeline extends into the boiler, and a spraying system is arranged.

[0016] The further setting of the above technical solution is: the reducing agent is liquid oxygen, ammonia water or urea.

[0017] The further setting of the above technical solution is: the concentration of the reducing agent solution is 10%-20%.

[0018] The further setting of the above technical solution is: the spraying system includes a multistage centrifugal pump, a flow meter, a valve group and an atomizing spray gun.

[0019] The further setting of the above technical solution is: at least two input pipelines are arranged.

[0020] The further setting of the above technical solution is: the temperature in the boiler is 850°C - 1100°C.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] 1. By detecting the flue gas components at key nodes, reasonably optimizing the operation of the kiln system, adjusting the flow pressure ratio of the atomizing liquid and compressed air, enabling the reducing agent and flue gas to mix for a fast and efficient denitration reaction, adjusting the temperature in the denitration area, and controlling the process of the fuel combustion reaction, ensuring the optimized conditions for the denitration reaction;

[0023] 2. Atomizing the reducing agent solution by compressed air and adopting two-fluid air atomization to improve the atomization effect and reduce the consumption of the reducing agent solution. Description of the Drawings

[0024] Figure 1 It is the structural schematic diagram of the present utility model.

[0025] Figure 2For Figure 1 The enlarged structural schematic diagram of part A in

[0026] Marked on the attached drawing: 100, mixing tank; 101, feed inlet; 102, water inlet;

[0027] 200, denitration unit; 210, pump body; 220, pouring pump; 230, flowmeter;

[0028] 300, gas tank; 310, flow valve;

[0029] 400, boiler;

[0030] 500, liquid storage tank; 510, liquid level gauge;

[0031] 600, input pipeline; 601, air inlet end; 602, water inlet end;

[0032] a, gas pipeline; b, water pipeline. Specific implementation mode

[0033] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following combines the attached drawings and preferred embodiments to elaborate in detail on the specific implementation mode, structure, features and their effects of the present utility model as follows.

[0034] As Figure 1 And Figure 2 Shown, the following embodiment discloses a non-catalytic flue gas denitration device, including those connected by pipelines,

[0035] Mixing tank 100, which is provided with a feed inlet 101 and a water inlet 102 for introducing a reducing agent and water to prepare a reducing agent solution;

[0036] Denitration unit 200, including a pump body 210 and a pouring pump 220, and the liquid outlet end of the pump body 210 is connected with a flowmeter 230;

[0037] Gas tank 300, used to provide compressed gas, and the gas outlet end of the gas tank 300 is provided with a flow valve 310;

[0038] The reducing agent solution in the mixing tank 100 passes through the denitration unit 200 and then enters the boiler 400 together with the gas to perform denitration treatment on the flue gas in the boiler 400.

[0039] The above is the basic scheme of this embodiment.

[0040] Specifically referring to Figure 1 Shown, the reducing agent enters the mixing tank 100 through the feed inlet 101. At the same time, liquid water also enters the mixing tank 100 through the water inlet 102, and the reducing agent and water are mixed to form a reducing agent solution;

[0041] The reducing agent solution is output from the pipeline to the pump body 210 of the denitration unit 200, and then output from the pump body 210 at a set flow rate;

[0042] Meanwhile, the compressed gas in the gas tank 300 is output along the gas pipeline b. The reducing agent solution and the compressed gas converge at the input end of the boiler 400 to form a mist, which is sprayed into the interior of the boiler 400 to perform denitration treatment on the flue gas in the boiler 400.

[0043] Preferably, in this embodiment, the concentration of the reducing agent solution formed in the mixing tank 100 is 10%-20%.

[0044] Preferably, the reducing agent is liquid oxygen, ammonia water or urea.

[0045] In this embodiment, for convenient use, the reducing agent solution is prepared in advance. In this embodiment, a liquid storage tank 500 is provided between the mixing tank 100 and the denitration unit 200, and a liquid level gauge 510 is provided in the liquid storage tank 500.

[0046] When preparing the reducing agent solution, for example, add 3 / 4 water to a 1-cubic-meter mixing tank, add an appropriate proportion of urea, and turn on the stirring button for about 20 minutes until the urea particles are fully dissolved. 2. After the urea solution is dissolved, the stirring motor can be stopped, and the urea solution can be pumped into the liquid storage tank 500 for storage and standby by operating the controller.

[0047] Therefore, in this embodiment, the pouring pump 220 is connected between the mixing tank 100 and the liquid storage tank 500.

[0048] The function of the pouring pump 220 is to pump the prepared reducing agent solution in the mixing tank 100 into the liquid storage tank 500.

[0049] In this embodiment, an input pipeline 600 is provided on the boiler 400. Along the input direction, an air inlet end 601 and a water inlet end 602 are sequentially provided on the input pipeline 600, which are respectively connected to the gas tank 300 and the denitration unit 200.

[0050] Specifically refer to Figure 2 As shown, the compressed gas output from the gas tank 300 enters the air inlet end 601 of the input pipeline 600 along the gas pipeline b. Meanwhile, the reducing agent solution enters the water inlet end 602 of the input pipeline 600 from the pump body 210 along the water pipeline a. The position of the water inlet end 602 is close to the output end of the input pipeline 600. Therefore, the compressed gas impacts the reducing agent solution from the rear, squeezes into the reducing agent solution, and pre-atomizes the reducing agent solution.

[0051] The input end of the input pipeline 600 extends into the boiler 400 and is provided with a spraying system.

[0052] In this embodiment, the middle part of the boiler 400 is provided with a heat insulation layer, and the input end of the input pipeline 600 extends into the heat insulation layer by 2 - 3 cm.

[0053] Preferably, the temperature inside the boiler 400 is 850°C - 1100°C.

[0054] In this embodiment, the injection system includes a multistage centrifugal pump, an injection flowmeter, a valve group, and an atomizing spray gun.

[0055] Specifically, in this embodiment, the valve group includes a water valve connected to the water pipeline a and a gas valve connected to the gas pipeline b; when the injection system is started, first open the water valve and the multistage centrifugal pump to make the reducing agent solution enter the output end of the input pipeline 600 first, then open the gas valve to input compressed gas, and finally spray towards the inside of the boiler 400 through the spray gun.

[0056] Preferably, in this embodiment, at least two injection systems are provided.

[0057] In this embodiment, the multistage centrifugal pump, the injection flowmeter, the valve group, and the atomizing spray gun are all prior arts and will not be elaborated here.

[0058] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes, and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A non-catalytic flue gas denitrification device, characterized in that: including those connected through pipelines, a stirring tank (100) provided with a feed inlet (101) and a water inlet (102) for introducing a reducing agent and water to prepare a reducing agent solution; a denitration unit (200) including a pump body (210) and a liquid pouring pump (220), with a flowmeter (230) connected to the liquid outlet end of the pump body (210); a gas tank (300) for providing compressed gas, with a flow valve (310) provided at the gas outlet end of the gas tank (300); the reducing agent solution in the stirring tank (100) and the gas are simultaneously introduced into a boiler (400) after passing through the denitration unit (200) to perform denitration treatment on the flue gas in the boiler (400); a liquid storage tank (500) is provided between the stirring tank (100) and the denitration unit (200), and a liquid level gauge (510) is provided in the liquid storage tank (500); an input pipeline (600) is provided on the boiler (400), and an air inlet end (601) and a water inlet end (602) are sequentially provided on the input pipeline (600) along the input direction, and are respectively connected to the gas tank (300) and the denitration unit (200).

2. The non-catalytic flue gas denitrification equipment according to claim 1, characterized in that: the liquid pouring pump (220) is connected between the stirring tank (100) and the liquid storage tank (500).

3. The non-catalytic flue gas denitrification equipment according to claim 1, characterized in that: the input end of the input pipeline (600) extends into the boiler (400) and is provided with a spraying system.

4. The non-catalytic flue gas denitrification equipment according to claim 1, characterized in that: the reducing agent is liquid oxygen, ammonia water or urea.

5. The non-catalytic flue gas denitration equipment according to claim 3, characterized in that: the spraying system includes a multistage centrifugal pump, a spraying flowmeter, a valve group and an atomizing spray gun.

6. The non-catalytic flue gas denitrification equipment according to claim 1, characterized in that: at least two input pipelines (600) are provided.

7. The non-catalytic flue gas denitration equipment according to claim 1, wherein: the temperature in the boiler (400) is 850°C - 1100°C.

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