Tail flue gas treatment system of horseshoe flame glass kiln

Abstract

The utility model belongs to the field of environmental protection, and provides a horseshoe flame glass kiln tail flue gas treatment system which comprises a main flue, a baking soda desulfurization reaction flue, a baking soda injection pipeline, an NH3 pipeline, a high-temperature electrostatic dust collector and a low-temperature catalytic denitration reactor, one end of the main flue receives flue gas at the tail of the horseshoe flame glass kiln, and the other end of the main flue is sequentially connected with the baking soda desulfurization reaction flue, the high-temperature electrostatic dust collector and the low-temperature catalytic denitration reactor in series; the baking soda desulfurization reaction flue is also connected with a baking soda spraying device through a baking soda spraying pipeline; and the main flue between the high-temperature electrostatic dust collector and the low-temperature catalytic denitration reactor is also connected with an ammonia water area through an NH3 pipeline.

Description

Technical Field

[0001] The utility model belongs to the field of environmental protection, and in particular relates to a flue gas treatment system at the tail end of a horseshoe flame glass kiln. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The flue gas at the tail of the horseshoe flame glass kiln has complex components, including: silicide, alkaline salt / metal and other high viscosity dust, as well as acidic substances such as H2S, SO2, HF, etc.; the flue gas temperature fluctuates greatly, flue gas temperature fluctuates between 230 and 350 ° C (the flue gas fluctuation range of different kilns is different); the nitrogen oxide concentration is high, the nitrogen oxide concentration is about 3000 mg / Nm 3 ~6000mg / Nm 3 At present, the flue gas treatment process at the tail of the horseshoe flame glass kiln mostly applies the flue gas desulfurization, denitrification and dust removal process system at the tail of the boiler. The more common ones are: baking soda dry desulfurization + catalytic reduction denitrification + heat exchanger + bag filter; catalytic reduction denitrification + heat exchanger + bag filter + wet desulfurization; catalytic reduction denitrification + heat exchanger + semi-dry desulfurization + bag filter, etc.

[0004] The existing flue gas treatment process at the tail end of the horseshoe flame glass kiln has the following problems: in order to accommodate conventional vanadium-based denitrification catalysts, it is necessary to increase the use of hot air furnaces to increase the temperature to above 380°C; and it is also necessary to increase the wastewater and waste residue caused by wet and semi-dry desulfurization processes and their post-treatment process facilities; in addition, due to the high viscosity of the smoke, the use of a heat exchanger also requires the addition of equipment to reduce the temperature of the smoke before it enters the bag filter; this results in the flue gas treatment system at the tail end of the horseshoe flame glass kiln occupying a large space and consuming a lot of investment. Utility Model Content

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the utility model proposes a flue gas treatment system at the tail end of a horseshoe flame glass kiln, which can reduce investment and floor space while ensuring the flue gas treatment efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A flue gas treatment system at the tail end of a horseshoe flame glass kiln, comprising: a main flue, a baking soda desulfurization reaction flue, a baking soda injection pipeline, an NH3 pipeline, a high-temperature electrostatic precipitator and a low-temperature catalytic denitrification reactor;

[0008] One end of the main flue receives the tail flue gas of the horseshoe flame glass kiln, and the other end is connected in series with the baking soda desulfurization reaction flue, the high-temperature electrostatic precipitator and the low-temperature catalytic denitrification reactor; the baking soda desulfurization reaction flue is also connected to the baking soda injection device through a baking soda injection pipeline; the main flue between the high-temperature electrostatic precipitator and the low-temperature catalytic denitrification reactor is also connected to the ammonia water area through an NH3 pipeline.

[0009] As an implementation mode, the end of the low-temperature catalytic denitration reactor is also connected to the chimney through a main flue.

[0010] As an implementation mode, an induced draft fan is also provided on the main flue connecting the low-temperature catalytic denitration reactor and the chimney.

[0011] As an embodiment, the number of the high-temperature electrostatic precipitator is at least one.

[0012] As an embodiment, when the number of the high-temperature electrostatic precipitators is at least two, the high-temperature electrostatic precipitators are connected in series.

[0013] As an implementation mode, the bottom of the high-temperature electrostatic precipitator is connected to a discharge / ash conveying system.

[0014] As an implementation mode, a first valve is provided on the baking soda injection pipeline.

[0015] As an implementation manner, the first valve is an electric valve.

[0016] As an implementation manner, a second valve is provided on the NH3 pipeline.

[0017] As an implementation manner, the second valve is an electric valve.

[0018] The beneficial effects of the utility model are:

[0019] The utility model is suitable for the flue gas characteristics of horseshoe flame glass kiln and meets the emission standards. The system is composed of a main flue, a baking soda desulfurization reaction flue, a baking soda injection pipeline, an NH3 pipeline, a high-temperature electrostatic precipitator and a low-temperature catalytic denitrification reactor, and the above-mentioned equipment are all conventional equipment. The ammonia water area connected to the NH3 pipeline and the baking soda powder injection device connected to the baking soda injection pipeline can be arranged at a long distance, which is more convenient for the compact factory area. The whole horseshoe flame glass kiln tail flue gas treatment system has a simple structure, organic integration, easy maintenance and use, small and compact footprint, high cost performance, high removal efficiency, and provides guarantee for the stable operation of the system.

[0020] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a schematic diagram of the structure of the tail flue gas treatment system of the horseshoe flame glass kiln according to an embodiment of the utility model.

[0023] Among them, 1. Main flue; 2. Baking soda desulfurization reaction flue; 3. High-temperature electrostatic precipitator; 4. Low-temperature catalytic denitrification reactor; 5. induced draft fan; 6. Chimney; 7. Baking soda injection pipeline; 8. NH3 pipeline. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] The temperature in the horseshoe flame glass kiln is above 1200℃, so SNCR cannot be used; the NOx concentration in the tail gas is mostly higher than 3000mg / Nm 3 , up to 6000mg / Nm 3 Above, the flue gas temperature is between 230 and 350°C, and the oxidation denitrification process cannot meet the emission standards and cannot use conventional vanadium-based catalysts.

[0028] In order to adapt to the high flue gas temperature and NOx concentration at the tail end of the horseshoe flame glass kiln, the utility model system uses a low-temperature catalyst to catalytically reduce NOx in the flue gas. The NOx removal efficiency using the low-temperature catalyst can reach up to 96%. The low-temperature catalyst has the advantage of being regenerable and recyclable by heating.

[0029] according to Figure 1This embodiment provides a flue gas treatment system for a horseshoe flame glass kiln, which includes: a main flue 1, a baking soda desulfurization reaction flue 2, a baking soda injection pipeline 7, an NH3 pipeline 8, a high-temperature electrostatic precipitator 3 and a low-temperature catalytic denitrification reactor 4;

[0030] One end of the main flue 1 receives the tail flue gas of the horseshoe flame glass kiln, and the other end is connected in series with the baking soda desulfurization reaction flue 2, the high-temperature electrostatic precipitator 3 and the low-temperature catalytic denitrification reactor 4; the baking soda desulfurization reaction flue 2 is also connected to the baking soda injection device through the baking soda injection pipeline 7; the main flue between the high-temperature electrostatic precipitator 3 and the low-temperature catalytic denitrification reactor 4 is also connected to the ammonia water area through the NH3 pipeline 8.

[0031] It should be noted here that the main flue, baking soda desulfurization reaction flue, baking soda injection pipe, NH3 pipe, high-temperature electrostatic precipitator, low-temperature catalytic denitrification reactor and baking soda injection device in this embodiment can all be implemented using existing structures, and technical personnel in this field can specifically select the corresponding model of product according to actual conditions.

[0032] In the baking soda injection device, baking soda powder is used as the desulfurizer. Baking soda powder is a high-efficiency desulfurizer. Generally, a sodium-sulfur ratio of ≤2 is selected, that is, the amount of baking soda used is small, the subsequent dust removal pressure is reduced, and the power consumption is reduced.

[0033] In the low-temperature catalytic denitration reactor of the present embodiment, a low-temperature catalyst is used as a denitration catalyst. The catalyst can be regenerated and recycled, thereby reducing the cost of catalyst replacement.

[0034] In one or more embodiments, a first valve is provided on the baking soda injection pipeline 7. The opening of the first valve can control the flow rate of baking soda injection.

[0035] In some optional embodiments, the first valve is an electric valve.

[0036] In some other embodiments, the first valve may also be implemented by a manual valve; wherein the specific structure of the first valve may be matched and selected by those skilled in the art according to specific circumstances.

[0037] In one or more embodiments, a second valve is provided on the NH3 pipeline 8, wherein the opening of the second valve can control the flow rate of NH3.

[0038] In some optional embodiments, the second valve is an electric valve.

[0039] In some other embodiments, the second valve may also be implemented by a manual valve; wherein the specific structure of the second valve may be matched and selected by those skilled in the art according to specific circumstances.

[0040] In this embodiment, the end of the low-temperature catalytic denitration reactor 4 is also connected to the chimney 6 through the main flue 1. The main flue 1 connecting the low-temperature catalytic denitration reactor 4 and the chimney 6 is also provided with an induced draft fan 5.

[0041] In one or more embodiments, the number of the high-temperature electrostatic precipitator 3 is at least one.

[0042] Wherein, when the number of the high-temperature electrostatic precipitators 3 is at least two, the high-temperature electrostatic precipitators are connected in series.

[0043] exist Figure 1 In the embodiment, the bottom of the high-temperature electrostatic precipitator 3 is connected to the unloading / ash conveying system.

[0044] It should be noted here that the unloading / ash conveying system can be implemented using the existing structure, which will not be described in detail here.

[0045] The working principle of the flue gas treatment system at the tail end of the horseshoe flame glass kiln in this embodiment is:

[0046] The flue gas coming out of the horseshoe flame glass kiln passes through the main flue 1 and enters the baking soda desulfurization reaction flue 2. The baking soda desulfurization reaction flue 2 contains baking soda powder (sodium bicarbonate powder) sprayed by the baking soda injection device through the baking soda injection pipeline. The baking soda powder is decomposed into highly active sodium carbonate and carbon dioxide under the action of the high-temperature flue gas in the baking soda desulfurization reaction flue 2. The highly active sodium carbonate fully contacts and reacts with the acidic medium in the reactor, thereby achieving the purpose of removing the acidic medium in the flue gas.

[0047] The flue gas obtained by desulfurization through the baking soda injection pipeline enters the high-temperature electrostatic precipitator 3 through the main flue for dust removal. The flue gas after dust removal is connected to the NH3 introduced through the NH3 pipeline 8 and enters the low-temperature catalytic denitrification reactor 4 together. The flue gas after nitrogen oxides are removed in the low-temperature catalytic denitrification reactor 4 enters the chimney 6 and is discharged into the atmosphere.

[0048] The flue gas treatment system at the tail end of the horseshoe flame glass kiln of this embodiment has no obvious temperature drop throughout the whole process, and the original chimney or a newly built chimney can be used as a dry chimney, thereby reducing the project cost and construction difficulty.

[0049] Acidic substances such as SO2, H2S, HF, etc. in the flue gas at the tail of the horseshoe flame glass kiln can cause corrosion to the low-temperature catalyst. This embodiment uses a baking soda dry desulfurization process before the low-temperature catalytic denitrification reactor. The baking soda dry desulfurization process can remove acidic substances in the flue gas with a removal efficiency of up to 95%. The equipment is simple, the maintenance rate is low, the baking soda powder is widely available, and the usage is small.

[0050] The concentration of particulate matter in the flue gas at the tail of the horseshoe flame glass kiln is relatively small and has high viscosity. In this embodiment, the concentration of particulate matter increases after the baking soda dry desulfurization process is used. In order to avoid catalyst blockage in the low-temperature catalytic denitrification reactor, a high-temperature electrostatic precipitator is set between the baking soda desulfurization process and the low-temperature catalytic denitrification reactor. Due to the complex composition of the flue gas at the tail of the glass kiln, a corrugated dust collection net and its vibration facilities are added to the high-temperature electrostatic precipitator, which effectively increases the dust collection surface and improves the efficiency of flue gas particulate removal. The concentration of particulate matter at the outlet of the high-temperature electrostatic precipitator can be reduced to 30mg / Nm 3 , meeting emission standards.

[0051] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A flue gas treatment system for a horseshoe flame glass kiln, characterized in that: include: Main flue, baking soda desulfurization reaction flue, baking soda injection pipeline, NH3 pipeline, high-temperature electrostatic precipitator and low-temperature catalytic denitrification reactor; One end of the main flue receives the tail flue gas of the horseshoe flame glass kiln, and the other end is connected in series with the baking soda desulfurization reaction flue, the high-temperature electrostatic precipitator and the low-temperature catalytic denitrification reactor; the baking soda desulfurization reaction flue is also connected to the baking soda injection device through a baking soda injection pipeline; the main flue between the high-temperature electrostatic precipitator and the low-temperature catalytic denitrification reactor is also connected to the ammonia water area through an NH3 pipeline.

2. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 1, characterized in that: The end of the low-temperature catalytic denitration reactor is also connected to the chimney through a main flue.

3. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 1, characterized in that: The main flue connecting the low-temperature catalytic denitration reactor and the chimney is also provided with an induced draft fan.

4. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 1, characterized in that: The number of the high-temperature electrostatic precipitator is at least one.

5. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 1, characterized in that: When the number of the high-temperature electrostatic precipitators is at least two, the high-temperature electrostatic precipitators are connected in series.

6. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 1, characterized in that: The bottom of the high-temperature electrostatic precipitator is connected to a discharge / ash conveying system.

7. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 1, characterized in that: The baking soda injection pipeline is provided with a first valve.

8. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 7, characterized in that: The first valve is an electric valve.

9. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 1, characterized in that: The NH3 pipeline is provided with a second valve.

10. The flue gas treatment system at the tail end of the horseshoe flame glass furnace according to claim 9, characterized in that: The second valve is an electric valve.

Images