Waste incineration flue gas denitration system

Abstract

The utility model discloses a waste incineration flue gas denitrification system which comprises an SNCR (selective non-catalytic reduction) denitrification module, a polymer denitrification module, a storage tank, a clear water tank, a mixing and diluting tank, a distributor and an atomizing spray gun, the storage tank and the clear water tank are both connected to an inlet of the mixing and diluting tank, and an outlet of the mixing and diluting tank is connected to the atomizing spray gun through the distributor. The atomizing spray guns of the two modules are arranged in the first flue channel and the second flue channel correspondingly, so that flue gas flows through the first flue channel and the second flue channel in the flue in sequence. Therefore, most of nitrogen oxides in the flue gas are firstly removed through the SNCR denitration module, then the flue gas is further removed through the polymer denitration module, the requirement for low emission of the nitrogen oxides in the flue gas can be met, and due to the fact that the SNCR denitration module and the polymer denitration module are low in cost, low-cost and high-efficiency denitration of waste incineration is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of computers, and more particularly to a waste incineration flue gas denitration system. BACKGROUND

[0002] In the field of waste incineration, nitrogen oxides (NOx) are one of the main pollutants of waste incineration flue gas emissions, which have a non-negligible harm to the environment and human health. At the same time, it is also a difficult-to-control index in the production and operation of waste incineration power plants. With the increasing strictness of national environmental protection policies, various places have successively raised the waste incineration flue gas emission index, which makes the existing waste incineration power plants have to upgrade and transform the flue gas denitration technology to meet the new environmental protection requirements, and the urgency of denitration transformation increases day by day.

[0003] At present, the mainstream waste incineration flue gas NOx removal technology is selective non-catalytic reduction denitration technology (SNCR) and selective catalytic reduction denitration technology (SCR). Although the SNCR denitration technology has relatively low cost, its denitration efficiency is low, and there is ammonia escape. The escaped ammonia gas can cause corrosion to the waste incineration waste heat boiler heating surface and the flue gas purification facility, thereby causing safety hazards. The system structure of the SCR technology is complex, which requires a large floor area, increases the construction cost of the power plant, and the SCR relies on expensive catalysts and needs to be replaced regularly. In the running process, steam is also consumed, which not only increases the investment cost, but also reduces the power generation of the waste incineration power plant, and the comprehensive operation cost is high.

[0004] As a new denitration technology, the operation cost of the high molecular denitration technology is between that of SNCR and SCR. However, at the present stage, the high molecular denitration agent mainly sprays powder-like substances into the flue, but the utilization rate of the powder denitration agent is low, and it is easy to be damp and blocked in actual application, and there is also the problem of ammonia escape.

[0005] How to carry out low-cost and high-efficiency denitration for waste incineration is a problem that needs to be concerned. CONTENT OF THE INVENTION

[0006] In view of the above problems, the present application provides a waste incineration flue gas denitration system to carry out low-cost and high-efficiency denitration for waste incineration.

[0007] In order to achieve the above purpose, the specific scheme is as follows:

[0008] A waste incineration flue gas denitration system, comprising an SNCR denitration module and a high molecular denitration module, the SNCR denitration module comprising an ammonia water storage tank, a first clean water tank, a first mixed dilution tank, a first distributor and a first atomizing lance, and the high molecular denitration module comprising a high molecular liquid denitration agent storage tank, a second clean water tank, a second mixed dilution tank, a second distributor and a second atomizing lance.

[0009] The ammonia water storage tank and the first clean water tank are connected to the inlet of the first mixed dilution tank, and the outlet of the first mixed dilution tank is connected to the first atomizing spray gun through the first distributor;

[0010] The high-molecular liquid denitration agent storage tank and the second clean water tank are connected to the inlet of the second mixed dilution tank, and the outlet of the second mixed dilution tank is connected to the second atomizing spray gun through the second distributor;

[0011] The first atomizing spray gun is arranged in a flue one passage, and the second atomizing spray gun is arranged in a flue two passage, wherein the flue one passage is upstream of the flue two passage in the flue, so that the flue gas flows through the flue one passage and the flue two passage in the flue in sequence.

[0012] Optionally, the first atomizing spray gun and the second atomizing spray gun each include three layers of ammonia water atomizing spray guns.

[0013] Optionally, each layer of ammonia water atomizing spray gun of the first atomizing spray gun is arranged in a temperature range of 900-1050℃.

[0014] Each layer of ammonia water atomizing spray gun of the second atomizing spray gun is arranged in a temperature range of 700-900℃.

[0015] Optionally, the high-molecular liquid denitration agent mixed tank contains high-molecular liquid denitration agent.

[0016] Optionally, the components of the high-molecular liquid denitration agent include alcohol base, sodium base and potassium base, and the components of the high-molecular liquid denitration agent do not include ammonia substance.

[0017] Optionally, the SNCR denitration module and the high-molecular denitration module are respectively provided with a temperature tracking system corresponding thereto.

[0018] Optionally, the SNCR denitration module further includes a first pipeline valve, and the high-molecular denitration module further includes a second pipeline valve.

[0019] Optionally, the garbage incineration flue gas denitration system further includes a flue gas online monitoring system, and the SNCR denitration module, the high-molecular denitration module and the flue gas online monitoring system are interlocked.

[0020] By the above technical scheme, the garbage incineration flue gas denitration system of the application comprises an SNCR denitration module and a polymer denitration module, the SNCR denitration module comprises an ammonia water storage tank, a first clean water tank, a first mixing and diluting tank, a first distributor, a first atomizing spray gun and a first pipeline valve, the polymer denitration module comprises a polymer liquid denitration agent storage tank, a second clean water tank, a second mixing and diluting tank, a second distributor, a second atomizing spray gun and a second pipeline valve, the ammonia water storage tank and the first clean water tank are both connected to the inlet of the first mixing and diluting tank, the outlet of the first mixing and diluting tank is connected to the first atomizing spray gun through the first distributor, the polymer liquid denitration agent storage tank and the second clean water tank are both connected to the inlet of the second mixing and diluting tank, the outlet of the second mixing and diluting tank is connected to the second atomizing spray gun through the second distributor, the first atomizing spray gun is arranged in a flue one passage, the second atomizing spray gun is arranged in a flue two passage, wherein the flue one passage is upstream of the flue two passage in the flue, so that the flue gas flows through the flue one passage and the flue two passage in the flue in sequence. As can be seen, the flue gas first passes through the SNCR denitration module to remove most of the nitrogen oxides, and then passes through the polymer denitration module for further removal, which can meet the low emission requirement of flue gas nitrogen oxides. Since the SNCR denitration module and the polymer denitration module are low in cost, the garbage incineration low-cost and high-efficiency denitration is realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a garbage incineration flue gas denitration system according to an embodiment of the application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the application.

[0024] Figure 1 FIG. 2 is a system structure for realizing garbage incineration flue gas denitration according to an optional embodiment of the application, as shown in the figure, the system structure can comprise an SNCR denitration module and a polymer denitration module. Figure 1

[0025] ​The SNCR denitration module can include an ammonia water storage tank 2, a first clean water tank 1, a first mixed dilution tank 3, a first distributor 4, and a first atomized spray gun 5. The high molecular denitration module can include a high molecular liquid denitration agent storage tank 9, a second clean water tank 10, a second mixed dilution tank 8, a second distributor 7, and a second atomized spray gun 6.

[0026] As shown in Figure 1 The ammonia water storage tank 2 and the first clean water tank 1 are both connected to the inlet of the first mixed dilution tank 3, and the outlet of the first mixed dilution tank 3 is connected to the first atomized spray gun 5 through the first distributor 4. The high molecular liquid denitration agent storage tank 9 and the second clean water tank 10 are both connected to the inlet of the second mixed dilution tank 8, and the outlet of the second mixed dilution tank 8 is connected to the second atomized spray gun 6 through the second distributor 7.

[0027] Specifically, the first atomized spray gun 5 is arranged in the first flue channel, and the second atomized spray gun 6 is arranged in the second flue channel. The first flue channel is upstream of the second flue channel in the flue, so that the flue gas flows through the first flue channel and the second flue channel in the flue in sequence.

[0028] Further, the first atomized spray gun 5 and the second atomized spray gun 6 each include three layers of ammonia water atomized spray guns.

[0029] Further, each layer of the ammonia water atomized spray gun of the first atomized spray gun 5 can be arranged in a temperature region of 900-1050℃, and each layer of the ammonia water atomized spray gun of the second atomized spray gun 6 can be arranged in a temperature region of 700-900℃.

[0030] It can be understood that the optimal reaction temperature for SNCR denitration is 900-1050℃, and by selecting a suitable temperature field at the temperature measuring point of the first flue channel (temperature 850-1150℃), three layers of ammonia water atomized spray guns are arranged. The optimal reaction temperature for high molecular denitration is 700-900℃, and by selecting a suitable temperature field at the temperature measuring point of the second flue channel (temperature 600-900℃), three layers of ammonia water atomized spray guns are arranged.

[0031] Further, the high molecular liquid denitration agent mixing tank contains a high molecular liquid denitration agent.

[0032] The high molecular liquid denitration agent includes alcohol base, sodium base, and potassium base, but does not include ammonia substances.

[0033] It can be understood that the high molecular denitration agent is a non-toxic liquid, does not contain ammonia, and is stable in operation. Under the action of high temperature, the high molecular denitration agent can quickly decompose to generate a large amount of high-activity free reducing groups, and the active groups react with NOx, without producing ammonia escape.

[0034] Further, the SNCR denitration module and the polymer denitration module are respectively equipped with corresponding temperature tracking systems.

[0035] Specifically, the temperature tracking system of the SNCR denitration module can be connected with the first distributor 4, and the temperature tracking system of the polymer denitration module can be connected with the second distributor 7. The temperature tracking system can monitor the furnace temperature signal and transmit the temperature signal to the first distributor 4 / second distributor 7, and the first distributor 4 / second distributor 7 adjusts the first atomizing lance 5 / second atomizing lance 6 according to the adjustment signal.

[0036] Further, the SNCR denitration module further comprises a first pipeline valve, and the polymer denitration module further comprises a second pipeline valve.

[0037] It can be understood that the first pipeline valve can control the proportion of the ammonia water storage tank 2 and the first clean water tank 1 input to the first mixed dilution tank 3, and the second pipeline valve can control the proportion of the polymer liquid denitration agent storage tank 9 and the second clean water tank 10 input to the second mixed dilution tank 8, so as to improve the reaction efficiency and save the consumption of ammonia water and polymer.

[0038] Further, the waste incineration flue gas denitration system can further comprise a flue gas online monitoring system, so that the SNCR denitration module and the polymer denitration module are interlocked with the flue gas online monitoring system.

[0039] Specifically, the flue gas online monitoring system can automatically adjust the injection ratio of the first atomizing lance 5 of the SNCR denitration module and the second atomizing lance 6 of the polymer denitration module according to the flue gas nitrogen oxide emission concentration, so as to reduce the comprehensive operation cost.

[0040] The garbage incineration flue gas denitration system provided by the embodiment comprises an SNCR denitration module and a polymer denitration module, the SNCR denitration module comprises an ammonia water storage tank, a first clean water tank, a first mixing and diluting tank, a first distributor, a first atomizing lance and a first pipeline valve, the polymer denitration module comprises a polymer liquid denitration agent storage tank, a second clean water tank, a second mixing and diluting tank, a second distributor, a second atomizing lance and a second pipeline valve, the ammonia water storage tank and the first clean water tank are connected to the inlet of the first mixing and diluting tank, the outlet of the first mixing and diluting tank is connected to the first atomizing lance through the first distributor, the polymer liquid denitration agent storage tank and the second clean water tank are connected to the inlet of the second mixing and diluting tank, the outlet of the second mixing and diluting tank is connected to the second atomizing lance through the second distributor, the first atomizing lance is arranged in a flue one passage, the second atomizing lance is arranged in a flue two passage, and the flue one passage is upstream of the flue two passage in the flue so that flue gas flows through the flue one passage and the flue two passage in the flue in sequence. As can be seen, the flue gas first passes through the SNCR denitration module to remove most of the nitrogen oxides, and then passes through the polymer denitration module for further removal, so that the low emission requirement of flue gas nitrogen oxides can be met, and the low-cost and high-efficiency denitration of garbage incineration is realized due to the low cost of the SNCR denitration module and the polymer denitration module.

[0041] In some subsequent embodiments, the working principle of the garbage incineration flue gas denitration system mentioned in the foregoing embodiments is introduced.

[0042] With reference to Figure 1 The clean water of the first clean water tank 1 and the ammonia water of the ammonia water storage tank 2 enter the first mixing and diluting tank 3 for stirring and dilution through a conveying pump in a certain proportion, and after sufficient stirring and dilution, the dilution liquid enters the first distributor 4 through a dilution pump. The first distributor 4 is connected with the first atomizing lance 5, the dilution liquid is atomized through the first atomizing lance 5, sprayed into the furnace chamber, fully contacted with the incineration flue gas, and the nitrogen oxides in the flue gas are removed. The first clean water tank 1 and the ammonia water storage tank 2 are provided with control valves to adjust the flow ratio of the clean water and the ammonia water. The first atomizing lance 5 is arranged in three layers in the furnace chamber according to the furnace chamber temperature field, and an optimal reaction temperature window automatic tracking system is arranged, which can automatically adjust the number of layers and the flow of the first atomizing lance 5 according to the change of the furnace chamber temperature, improve the reaction efficiency, and reduce the ammonia water consumption.

[0043] The clean water of the second clean water tank 10 and the ammonia water of the high polymer liquid denitration agent storage tank 9 are mixed in the second mixing and diluting tank 8 by a certain proportion through a delivery pump, and then are stirred and diluted. After being fully stirred and diluted, the diluted liquid is pumped into the second distributor 7 through a diluting pump. The second distributor 7 is connected with the second atomizing spray gun 6. The diluted liquid is atomized by the second atomizing spray gun 6, and is sprayed into the furnace chamber to fully contact with the incineration flue gas to remove the nitrogen oxides in the flue gas. The second clean water tank 10 and the high polymer liquid denitration agent storage tank 9 are provided with control valves to adjust the flow proportion of the clean water and the high polymer liquid denitration agent. The second atomizing spray gun 6 is arranged in three layers in the furnace chamber according to the temperature field of the furnace chamber, and is provided with an optimal reaction temperature window automatic tracking system. The number of layers and the flow of the second atomizing spray gun 6 can be automatically adjusted according to the change of the temperature of the furnace chamber, so as to improve the reaction efficiency and reduce the consumption.

[0044] Finally, it should be noted that the terms such as first and second, etc. are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0045] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The various embodiments can be combined as needed, and the same and similar parts refer to each other.

[0046] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A waste incineration flue gas denitration system, characterized in that, The SNCR denitration module comprises an ammonia water storage tank, a first clean water tank, a first mixing and diluting tank, a first distributor and a first atomizing lance, and the high polymer denitration module comprises a high polymer liquid denitration agent storage tank, a second clean water tank, a second mixing and diluting tank, a second distributor and a second atomizing lance. The ammonia water storage tank and the first clean water tank are both connected to the inlet of the first mixing and diluting tank, and the outlet of the first mixing and diluting tank is connected to the first atomizing lance through the first distributor. The high polymer liquid denitration agent storage tank and the second clean water tank are both connected to the inlet of the second mixing and diluting tank, and the outlet of the second mixing and diluting tank is connected to the second atomizing lance through the second distributor. The first atomizing lance is arranged in a flue one passage, and the second atomizing lance is arranged in a flue two passage, wherein the flue one passage is upstream of the flue two passage in the flue, so that the flue gas flows through the flue one passage and the flue two passage in the flue in sequence.

2. The waste incineration flue gas denitration system according to claim 1, characterized in that, The first atomizing lance and the second atomizing lance both comprise three layers of ammonia water atomizing lances.

3. The waste incineration flue gas denitration system according to claim 2, characterized in that, Each layer of ammonia water atomizing lance of the first atomizing lance is arranged in a temperature region of 900-1050℃. Each layer of ammonia water atomizing lance of the second atomizing lance is arranged in a temperature region of 700-900℃.

4. The waste incineration flue gas denitration system according to claim 1, characterized in that, The high polymer liquid denitration agent mixing tank contains high polymer liquid denitration agent.

5. The waste incineration flue gas denitration system according to claim 4, characterized in that, The components of the high polymer liquid denitration agent include alcohol base, sodium base and potassium base, and the components of the high polymer liquid denitration agent do not include ammonia substance.

6. The waste incineration flue gas denitration system according to claim 1, characterized in that, The SNCR denitration module and the high polymer denitration module are respectively provided with corresponding temperature tracking systems.

7. The waste incineration flue gas denitration system according to claim 1, characterized in that, The temperature tracking system of the SNCR denitration module is connected with the first distributor, and the temperature tracking system of the high polymer denitration module is connected with the second distributor.

8. The waste incineration flue gas denitration system according to claim 1, characterized in that, The SNCR denitration module further comprises a first pipeline valve, and the high polymer denitration module further comprises a second pipeline valve.

9. The system for flue gas denitration of waste incineration according to any one of claims 1 to 8, characterized in that, An online flue gas monitoring system is further included, and the SNCR denitration module, the high polymer denitration module and the online flue gas monitoring system are interlocked.

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