Ammonia-containing waste gas treatment system

Abstract

The utility model relates to the technical field of ammonia-containing waste gas treatment, in particular to an ammonia-containing waste gas treatment system which comprises a combustion furnace, the combustion furnace comprises a first hearth, a second hearth, a third hearth and a fourth hearth which are communicated, and the first hearth is connected with a primary air supply device, a fuel supply device and an ammonia-containing waste gas supply device; the second hearth is connected with a flue gas circulating supply device for cooling the hearth; the third hearth is connected with a secondary air supply device; the fourth hearth is connected with an amino reducing agent supply device and is connected with a flue gas emission pipeline, through the design of segmented combustion of the combustion furnace, the possibility that ammonia gas is not consumed in the reaction process and is emitted into the environment is reduced, nitrogen oxide emission in the ammonia-containing waste gas treatment process is effectively reduced, and the ammonia-containing waste gas treatment efficiency is improved. Therefore, the pollution to the environment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to ammonia-containing waste gas treatment technical field, especially ammonia-containing waste gas treatment system. BACKGROUND

[0002] In the prior art industrial production, such as synthetic ammonia plant, urea production plant, coke oven gas, nitric acid device tail gas, etc. A large amount of ammonia-containing waste gas will be produced in the production process, which will cause serious environmental pollution if directly discharged into the atmosphere, so it is necessary to treat the ammonia-containing waste gas. The main methods of ammonia-containing waste gas treatment include biological method, chemical method, adsorption method, membrane method and combustion method. Among them, the combustion method is widely used because it does not need catalyst, has small investment cost and good treatment effect.

[0003] In the Chinese patent document with publication number CN201191000Y, a kind of ammonia-containing waste gas incineration treatment system is disclosed, including incinerator, ammonia-containing waste gas supply system, fuel gas supply system, combustion air supply system, wherein incinerator has two combustion chambers, ammonia-containing waste gas is divided into two ways, ammonia-containing waste gas is supplied to the two combustion chambers of incinerator at the same time, ammonia is decomposed and oxidized at high temperature in a combustion chamber, after the gas reaction of a combustion chamber, it enters the second combustion chamber, and carries out denitration reaction in the second combustion chamber.

[0004] In the above technical solution, ammonia is decomposed and oxidized at high temperature in a combustion chamber, and denitration reaction is carried out in the second combustion chamber. This method cannot effectively inhibit the generation of nitrogen oxides in the treatment of ammonia-containing waste gas, and is easy to cause ammonia gas escape or insufficient reaction of nitrogen oxides, causing secondary pollution of the environment. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of ammonia-containing waste gas treatment system, adopt the furnace of segmented combustion design, reduce ammonia gas escape and nitrogen oxides emission in ammonia-containing waste gas incineration treatment, reduce pollution to environment.

[0006] To solve the above technical problems, the embodiment of the utility model provides a technical scheme, as follows:

[0007] The application discloses an ammonia-containing waste gas treatment system, which comprises a combustion furnace, wherein the combustion furnace comprises a first furnace chamber, a second furnace chamber, a third furnace chamber and a fourth furnace chamber which are communicated; the first furnace chamber is connected with a primary air supply device, a fuel supply device and an ammonia-containing waste gas supply device; the second furnace chamber is connected with a flue gas circulation supply device for furnace cooling; the third furnace chamber is connected with a secondary air supply device; the fourth furnace chamber is connected with an amino reducing agent supply device; the fourth furnace chamber is connected with a flue gas discharge pipeline; the flue gas discharge pipeline is provided with a heat exchange device; the ammonia-containing waste gas is treated by the combustion furnace to form flue gas; the flue gas is discharged through the flue gas discharge pipeline; and the flue gas is introduced into the second furnace chamber through the flue gas circulation supply device after heat exchange with the heat exchange device.

[0008] Further, the second furnace chamber is connected with an air supply device.

[0009] Further, the combustion furnace is provided with a temperature sensor and a pressure sensor; the flue gas discharge pipeline is provided with a gas component testing device; the primary air supply device, the fuel supply device, the ammonia-containing waste gas supply device, the flue gas circulation supply device, the air supply device, the secondary air supply device and the amino reducing agent supply device are provided with adjusting valves; and the intelligent control device can adjust and control the adjusting valves according to the data collected by the temperature sensor, the pressure sensor and the gas component testing device.

[0010] Further, the heat exchange device is a boiler.

[0011] Further, the amino reducing agent supplied by the amino reducing agent supply device is one of ammonia-containing waste gas, ammonia gas and urea.

[0012] Further, the flue gas discharge pipeline is provided with an induced draft fan.

[0013] Further, the flue gas discharge pipeline is communicated with a flue gas release pipeline and a flue gas circulation pipeline; the flue gas release pipeline is connected with a chimney; and the flue gas circulation pipeline is connected with the flue gas circulation supply device.

[0014] Compared with the prior art, the ammonia-containing waste gas treatment system provided by the application implements more reasonable and fine control on the treatment of ammonia-containing waste gas through the design of the combustion furnace, effectively controls the emission of unreacted ammonia, reduces the possibility that ammonia gas is not consumed in the reaction process and is discharged into the environment, effectively reduces the emission of nitrogen oxides in the ammonia-containing waste gas treatment process, thereby reducing the pollution to the environment, the heat energy in the discharged flue gas is recycled through the heat exchange device and the flue gas circulation supply device, the second furnace chamber is cooled by using the cooled flue gas, the dependence of the ammonia-containing waste gas treatment system on external energy is reduced, the overall energy efficiency is obviously improved, and the enterprise operating cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which do not limit the present embodiments in which like reference numerals refer to similar components throughout and in which:

[0016] Figure 1 is a schematic diagram of a structure of an ammonia-containing waste gas treatment system in the embodiments of the present application.

[0017] Mark explanation: 1, combustion furnace; 11, first hearth; 12, second hearth; 13, third hearth; 14, fourth hearth; 2, heat exchange device; 3, chimney; 31, flue gas release pipeline; 10, primary air supply device; 20, fuel supply device; 30, ammonia-containing waste gas supply device; 40, flue gas circulating supply device; 401, flue gas circulating pipeline; 50, air supply device; 60, secondary air supply device; 70, amino reducing agent supply device; 80, flue gas discharge pipeline; 4, regulating valve; 5, induced draft fan; 6, temperature sensor; 7, pressure sensor; 8, gas composition testing device. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in each claim of the present application can be realized.

[0019] As Figure 1The utility model discloses an embodiment relates to a kind of ammonia-containing waste gas treatment systems, including combustion furnace 1, the combustion furnace 1 including intercommunication first hearth 11, second hearth 12, third hearth 13, fourth hearth 14, the first hearth 11 is connected with once wind supply device 10, fuel supply device 20 and ammonia-containing waste gas supply device 30 are equipped;The second hearth 12 is equipped with flue gas circulation supply device 40 for hearth cooling;The third hearth 13 is connected with secondary air supply device 60;The fourth hearth 14 is connected with amino reducing agent supply device 70, the fourth hearth 14 is connected with flue gas discharge pipeline 80, and heat exchange device 2 is equipped on the flue gas discharge pipeline 80, ammonia-containing waste gas is formed after flue gas after being treated by combustion furnace 1, and the flue gas is discharged by flue gas discharge pipeline 80, and the flue gas is introduced into second hearth 12 by flue gas circulation supply device 40 after heat exchange with heat exchange device 2.The above-mentioned combustion furnace 1 uses subsection combustion technology, and the incineration treatment of ammonia-containing waste gas is divided into four stages, in the first hearth 11, by the high temperature above 1350 DEG C, ammonia-containing waste gas, fuel and once wind are introduced, make ammonia gas reduce and decompose into nitrogen and hydrogen under high temperature, and by controlling the input of once wind, form low oxygen environment, inhibit the generation amount of nitrogen oxide, preferably, the fuel is methane;In second hearth 12, low-temperature flue gas is introduced by flue gas circulation supply device 40, and the inside of second hearth 12 is rapidly cooled to 950 DEG C-1150 DEG C, to effectively prevent the re-generation of nitrogen oxide, ensure the stability of reaction product, by the cooling of high-temperature flue gas generated in the first hearth 11, it is also beneficial to prevent the damage of high temperature to post-process equipment;In third hearth 13, secondary air is introduced, so that the ammonia gas remaining in the first hearth 11 due to incomplete combustion can be secondarily combusted and decomposed, which is beneficial to the control and balance of post-process denitration reaction and reduces the escape amount of ammonia gas;In fourth hearth 14, amino reducing agent is introduced, and denitration reaction is carried out, nitrogen oxide is removed, nitrogen oxide is converted into nitrogen and water and other harmless gases and discharged to flue gas discharge pipeline 80.

[0020] In one embodiment, to increase the cooling rate of the second hearth 12, the second hearth 12 is also connected with an air supply device 50, which introduces low-temperature air into the second hearth 12 to increase the cooling rate of the second hearth 12.

[0021] In one embodiment, the intelligent control device is included, the temperature sensor 6 and the pressure sensor 7 are arranged in the combustion furnace 1, the gas composition testing device 8 is arranged on the flue gas discharge pipeline 80, the primary air supply device 10, the fuel supply device 20, the ammonia-containing waste gas supply device 30, the flue gas circulation supply device 40, the air supply device 50, the secondary air supply device 60, and the amino reducing agent supply device 70 are provided with the regulating valve 4, and the intelligent control device can adjust and control the regulating valve 4 according to the data collected by the temperature sensor 6, the pressure sensor 7, and the gas composition testing device 8. By monitoring the temperature, pressure, and gas composition in the reaction process in real time, the control device can control the injection amount of multiple gases through an intelligent algorithm, optimize the reaction conditions in the combustion furnace 1, improve the stability of the reaction, and enhance the flexibility of the ammonia-containing waste gas treatment system, so that it can adapt to different operating conditions.

[0022] In one embodiment, the ammonia-containing waste gas treatment system is related to a combustion furnace 1, the fourth furnace 14 of the combustion furnace 1 is connected with a flue gas discharge pipeline 80, a heat exchange device 2 is arranged on the flue gas discharge pipeline 80, the ammonia-containing waste gas is formed into flue gas after being treated by the combustion furnace 1, the flue gas is discharged through the flue gas discharge pipeline 80, the heat exchange device 2 can effectively capture the heat energy released in the flue gas, so that the heat energy in the flue gas can be reused, thereby improving the energy efficiency of the entire system; the flue gas discharge pipeline 80 is connected with a flue gas release pipeline 31 and a flue gas circulation pipeline 401, the flue gas release pipeline 31 is connected with a chimney 3, and the flue gas circulation pipeline 401 is connected with a flue gas circulation supply device 40; the heat energy of the flue gas in the flue gas circulation pipeline 401 is reduced after passing through the heat exchange device 2, and the temperature is reduced, a part of the flue gas is guided to the chimney 3, and another part of the flue gas is branched to the flue gas circulation pipeline 401 and supplied to the second furnace 12 by the flue gas circulation supply device 40 for cooling the second furnace 12. Through the recycling and waste heat utilization of the flue gas, the heat energy released in the flue gas discharge is effectively utilized and converted into heat that can be used to heat circulating water or other media, thereby reducing the dependence on external energy, reducing energy consumption, and reducing environmental impact, which is conducive to reducing operating costs. Preferably, the heat exchange device 2 is a waste heat boiler, and an induced draft fan 5 is arranged on the flue gas discharge pipeline 80 and the flue gas circulation pipeline 401 to guide the flue gas.

[0023] The ammonia-containing waste gas treatment system provided by the utility model, relative to the prior art, through the design of the segmented combustion of the combustion furnace, the treatment of the ammonia-containing waste gas is more reasonably and finely controlled, the emission of unreacted ammonia is effectively controlled, the possibility of ammonia gas being emitted to the environment without being consumed in the reaction process is reduced, the emission of nitrogen oxides in the ammonia-containing waste gas treatment process is effectively reduced, thereby reducing the pollution to the environment, through the heat exchange device and the flue gas circulation supply device, the heat energy in the emitted flue gas is recycled and reused, and the second hearth is cooled by using the cooled flue gas, the dependence of the ammonia-containing waste gas treatment system on external energy is reduced, the overall energy efficiency is obviously improved, and the enterprise operating cost is reduced.

[0024] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the utility model, and in actual application, various changes can be made to them in form and details without departing from the spirit and scope of the utility model.

Claims

1. An ammonia-containing exhaust gas treatment system, characterized by, The combustion furnace (1) comprises a first furnace (11), a second furnace (12), a third furnace (13), and a fourth furnace (14) which are connected in sequence, the first furnace (11) is connected with a primary air supply device (10), a fuel supply device (20), and an ammonia-containing waste gas supply device (30); the second furnace (12) is connected with a flue gas circulation supply device (40) for furnace cooling; the third furnace (13) is connected with a secondary air supply device (60); the fourth furnace (14) is connected with an amino reducing agent supply device (70), and the fourth furnace (14) is connected with a flue gas discharge pipeline (80), the flue gas discharge pipeline (80) is provided with a heat exchange device (2), the ammonia-containing waste gas is treated by the combustion furnace (1) to form flue gas, the flue gas is discharged through the flue gas discharge pipeline (80), and the flue gas exchanges heat with the heat exchange device (2) and is introduced into the second furnace (12) through the flue gas circulation supply device (40).

2. The ammonia-containing exhaust gas treatment system of claim 1, wherein, The second furnace (12) is connected with an air supply device (50).

3. The ammonia-containing exhaust gas treatment system of claim 2, wherein, The combustion furnace (1) is provided with a temperature sensor (6) and a pressure sensor (7), the flue gas discharge pipeline (80) is provided with a gas component testing device (8), the primary air supply device (10), the fuel supply device (20), the ammonia-containing waste gas supply device (30), the flue gas circulation supply device (40), the air supply device (50), the secondary air supply device (60), and the amino reducing agent supply device (70) are provided with adjusting valves (4), and the intelligent control device can adjust and control the adjusting valves (4) according to the data collected by the temperature sensor (6), the pressure sensor (7), and the gas component testing device (8).

4. The ammonia-containing exhaust gas treatment system of claim 1, wherein, The heat exchange device (2) is a boiler.

5. The ammonia-containing exhaust gas treatment system of claim 1, wherein, The amino reducing agent supplied by the amino reducing agent supply device (70) is one of ammonia-containing waste gas, ammonia gas, and urea.

6. The ammonia-containing exhaust gas treatment system of claim 1, wherein, The flue gas discharge pipeline (80) is provided with an induced draft fan (5).

7. An ammonia-containing exhaust gas treatment system according to any one of claims 1-6, characterized in that, The flue gas discharge pipeline (80) is connected with a flue gas release pipeline (31) and a flue gas circulation pipeline (401), the flue gas release pipeline (31) is connected with a chimney (3), and the flue gas circulation pipeline (401) is connected with the flue gas circulation supply device (40).

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