CN209828709U - Iron and steel sintering flue gas denitration system - Google Patents
Iron and steel sintering flue gas denitration system Download PDFInfo
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- CN209828709U CN209828709U CN201821681288.3U CN201821681288U CN209828709U CN 209828709 U CN209828709 U CN 209828709U CN 201821681288 U CN201821681288 U CN 201821681288U CN 209828709 U CN209828709 U CN 209828709U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to an atmospheric pollutants administers technical field, discloses a steel sintering flue gas denitration system, the sintering flue gas after dust removal, desulfurization at first gets into gas heater and preheats, improves flue gas temperature through coke oven gas combustor burning coke oven gas afterwards, spouts the reductant by reductant injection apparatus again, after the misce bene, gets into denitration reactor, under the effect of low temperature SCR catalyst, NOx and NH in the flue gas3Reaction to produce N2And H2O to reach the aim of denitration, a flue gas heat exchanger is arranged on a denitration outlet flue, and an inlet is heated by waste heatFlue gas. The utility model discloses utilize rotation gas heater and coke oven gas burning to improve sintering gas temperature to the catalyst optimum temperature interval, adopt low temperature SCR denitration technique to reduce nitrogen oxide concentration in the flue gas, provide a low energy consumption, efficient sintering gas denitration technical scheme.
Description
Technical Field
The utility model relates to a steel sintering flue gas denitration system can effectively reduce NOx's in the sintering flue gas content, realizes the clean emission of flue gas, belongs to atmospheric pollutants and administers technical field.
Background
The iron and steel industry is one of the most important basic industries in China, and brings about a serious problem of air pollution while making an important contribution to economic development. The nitrogen oxide is one of the main atmospheric pollutants discharged by steel enterprises, wherein the NOx generated in the steel sintering process accounts for about 50% of the total emission of the whole plant, and the sintering flue gas is the largest generation source of the NOx of the steel enterprises and is the key point for controlling the NOx discharge of the steel enterprises. The concentration of NOx in the sintering flue gas is generally 200-500 mg/Nm3Wherein the fuel type NO accounts for more than 90% of the total amount of NOx.
The emission limit of the flue gas pollutants required by a key control area in the 'emission standard of the atmospheric pollutants for the steel sintering and pelletizing industry' issued and implemented in 2012 is as follows: SO (SO)2The discharge concentration is less than or equal to 180mg/Nm3NOx emission concentration is less than or equal to 300mg/Nm3The emission concentration of the particulate matters is less than or equal to 40mg/Nm3. With the continuous increase of the air pollution prevention and control force and the improvement of the current domestic flue gas desulfurization and denitration technology level, the national environmental protection department further strictly controls the steel sintering and pelletizing industry pollution discharge. In 2017, the ministry of environmental protection issued a "notice on execution of special emission limits of atmospheric pollutants in Jingjin Ji and surrounding areas" (draft for comments) and "about issuing<Industrial atmosphere for sintering and pelletizing steelEmission standard of pollutants>Waiting for 20 notices (solicited comments) of national pollutant emission standard modification notes, the notices propose: increasing the requirement of the reference oxygen content of the sintering flue gas and modifying the special emission limit value of the atmospheric pollutants, namely SO2The limit is adjusted to 50mg/Nm3NOx Limit adjusted to 100mg/Nm3The limit of the particulate matter is adjusted to 20mg/Nm3。
In the past, various iron and steel production enterprises basically can achieve that NOx does not exceed 300mg/Nm mainly by means of adjusting fuel proportioning and controlling sintering process3The limit is required. Therefore, before the announcement of the further reduction of the restriction is released, the number of sintering machines which really implement the denitration of the tail end of the sintering flue gas is less than 2% of the total number of the sintering machines, and after the implementation of the standard revision, most of the existing production enterprises need to additionally provide a sintering flue gas denitration device.
At present, the denitration technology of sintering flue gas mainly adopts active coke adsorption. The denitration efficiency of the active coke adsorption method is about 50% -70%, the construction cost and the operation cost are high, the method is suitable for newly-built projects, and the desulfurization and denitration are cooperatively treated, however, the flue gas desulfurization device is configured in most of the sintering machines in China at present, and the problem of repeated construction can occur. And the power industry applies mature SCR denitration technology, the temperature of flue gas required by reaction is generally 300-450 ℃, the temperature of sintering flue gas is 100-180 ℃, the temperature of flue gas after desulfurization is further reduced to 60-100 ℃, the temperature of flue gas needs to be raised to the optimal temperature range of the catalyst, the energy consumption is high, and the operation cost is high. Therefore, the utility model discloses a sintering flue gas denitration technique of high efficiency, low energy consumption suitable for steel enterprise reduces nitrogen oxide and discharges, reduces the harm to the environment for the development.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a steel sintering flue gas denitration system, solve present active burnt absorption construction cost and running cost height, to most project that has disposed flue gas desulfurization device cause the problem of repeated construction to and medium temperature SCR denitration technique flue gas need heat up earlier to the catalyst optimum temperature interval, the energy consumption is big, the high technical problem of running cost.
In order to achieve the technical purpose, the technical scheme of the utility model is as follows:
the utility model provides a steel sintering flue gas denitration system, locates after dust pelletizing system and desulfurization system, its characterized in that: the denitration device comprises a denitration inlet flue, a denitration reactor and a denitration outlet flue; a low-temperature SCR catalyst is arranged in the denitration reactor; the denitration inlet flue is connected with a flue gas inlet end of the denitration reactor, and a combustor and a reducing agent injection device are sequentially arranged on the denitration inlet flue along the flow direction of flue gas; the denitration outlet flue is connected with a flue gas outlet end of the denitration reactor, and the tail part of the denitration outlet flue is communicated with a chimney; and the side-by-side parts of the denitration inlet flue and the denitration outlet flue are provided with flue gas heat exchangers, so that the heat exchange between high-temperature flue gas in the denitration outlet flue and low-temperature flue gas in the denitration inlet flue is realized.
As the utility model discloses a preferred technical scheme, the combustor is premixed flame burner, and the combustor fuel adopts coke oven gas, and combustion-supporting wind adopts the sintering flue gas, and its quantity is 1 ~ 10.
Further preferably, the temperature of the flue gas at the inlet of the denitration inlet flue is 60-100 ℃, and the flue gas is preliminarily preheated to 160-170 ℃ through a flue gas heat exchanger.
Further preferably, the combustor heats the flue gas to the optimal activity temperature of the low-temperature SCR catalyst, which is 180-200 ℃.
Further preferably, the flue gas heat exchanger is a rotary heat exchanger.
More preferably, the low-temperature SCR catalyst is one or more layers of honeycomb type, flat plate type or corrugated plate type catalysts, and a soot blower is arranged above the low-temperature SCR catalyst.
The utility model discloses utilize gas heater to preheat the sintering flue gas to let in coke oven gas burning and heat up to the optimum active temperature interval of SCR low temperature catalyst, flue gas after the heating and the reducing agent homogeneous mixing back of spouting into, get into the denitration reactor, under the effect of catalyst, NOx and NH in the flue gas3Reaction to produce N2And H2And O, thereby achieving the purpose of removing the nitrogen oxide. Compared with the prior art, the utility model has the advantages of as follows:
1. the application range is wide: the utility model is suitable for newly-built projects, is also suitable for the matching transformation of the existing desulfurization process of iron and steel enterprises, and only needs to build a denitration device after desulfurization to be matched with the original sintering flue gas environmental protection treatment system;
2. safety and stability: denitration device arranges behind dust removal, desulphurization unit, heavy metal, ash content, SO in the flue gas2The concentration is low, thereby being beneficial to the safe and stable operation of the catalyst;
3. the cost is low: the utility model utilizes the flue gas waste heat and the combustion of the coke oven gas to improve the flue gas temperature to the optimal active temperature range of the low-temperature catalyst, fully utilizes the existing conditions of the steel mill, takes the coke oven gas as fuel, takes the sintering flue gas (the oxygen content is about 16 percent) as auxiliary hot air, consumes less energy and has low operation cost;
4. the denitration efficiency is high: along with steel industry environmental protection policy tends to stricter gradually, future nitrogen oxide discharges the limit value and probably further reduces, the utility model discloses denitration efficiency can reach more than 90%, possesses environmental protection foresight.
Drawings
The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are given by way of illustration only and not by way of limitation, wherein:
FIG. 1 is a schematic diagram of the denitration system for steel sintering flue gas of the present invention.
Reference numerals: 1-flue gas heat exchanger; 2-a burner; 3-a reductant injection device; 4-low temperature SCR catalyst; 5-denitration inlet flue; 6-a denitration reactor; 7-denitration outlet flue; 8-chimney.
Detailed Description
Hereinafter, embodiments of the system for denitration of flue gas generated by sintering steel according to the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein. The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of the respective portions and the mutual relationships thereof. It should be noted that for the sake of clarity in showing the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. As shown in fig. 1, the steel sintering flue gas denitration system of the utility model is arranged behind the dust removal system and the desulfurization system, and comprises a denitration inlet flue 5, a denitration reactor 6 and a denitration outlet flue 7; a low-temperature SCR catalyst 4 is arranged in the denitration reactor 6; the denitration inlet flue 5 is connected with a flue gas inlet end of a denitration reactor 6, and a combustor 2 and a reducing agent injection device 3 are sequentially arranged on the denitration inlet flue along the flow direction of flue gas; the denitration outlet flue 7 is connected with the flue gas outlet end of the denitration reactor 6, and the tail part of the denitration outlet flue is communicated with a chimney 8; the side-by-side parts of the denitration inlet flue 5 and the denitration outlet flue 7 are provided with the flue gas heat exchanger 1, so that heat exchange between high-temperature flue gas in the denitration outlet flue 7 and low-temperature flue gas in the denitration inlet flue 5 is realized.
The combustor 2 is a premixed flame combustor, coke oven gas is used as a combustor fuel, sintering flue gas is used as combustion-supporting air, and the number of the combustion-supporting air can be 1-10. The flue gas temperature at the inlet of the denitration inlet flue 5 is 60-100 ℃, and is preliminarily preheated to 160-170 ℃ through the flue gas heat exchanger 1. The combustor 2 heats the flue gas to the optimal activity temperature of the low-temperature SCR catalyst 4, which is 180-200 ℃. The flue gas heat exchanger (1) is a rotary heat exchanger. The low-temperature SCR catalyst 4 is one or more layers of honeycomb type, flat plate type or corrugated plate type catalysts, and a soot blower is arranged above the low-temperature SCR catalyst 4.
The utility model discloses a denitrification facility arranges behind dust removal, desulphurization unit, and sintering flue gas after the desulfurization goes into from the denitrationThe flue 5 enters, the temperature of flue gas is about 60-100 ℃, and the flue gas is preliminarily preheated to 160-170 ℃ through the flue gas heat exchanger 1; the flue gas heat exchanger (1) is a rotary heat exchanger, and the high-temperature flue gas at the outlet of the denitration reactor is fully utilized to conduct heat transfer and temperature rise on the low-temperature sintering flue gas, so that the flue gas waste heat is recovered, and the energy consumption is reduced; sintering flue gas subjected to primary preheating by GGH enters a combustion temperature rising section, a plurality of coke oven gas burners are arranged in a denitration inlet flue 5, and the flue gas is heated to the optimal activity temperature (180-200 ℃) of the low-temperature SCR catalyst through coke oven gas combustion; the burner fuel is coke oven gas with higher heat value in the iron and steel plant, the sintering flue gas with high oxygen content is used as auxiliary hot air, and the burner is a premixed flame burner, so that the combustion efficiency is improved, and the generation amount of CO is reduced; the sintering flue gas after temperature rise flows through a reducing agent injection device 3, is uniformly mixed with a reducing agent, then enters a denitration reactor 6, and NH is carried out under the action of a catalyst3Reacts with NOx in the flue gas and is converted into N2And H2O, realizing the aim of denitration; the denitrated high-temperature flue gas enters the GGH heat exchange device again, waste heat of the denitration outlet flue gas is recovered, the waste heat is used for heating the denitration inlet flue gas, and then the denitration inlet flue gas enters the chimney to be discharged.
E.g. at some 400m2The sintering machine is taken as an example, and the specific structure, the working principle and the working process of the invention are further explained by combining the attached drawings.
The utility model discloses a steel sintering flue gas denitration system, including gas heater 1, coke oven gas combustor 2, reductant injection apparatus 3, low temperature SCR catalyst 4 etc..
The sintering flue gas temperature after the semi-dry desulfurization is 80 ℃, and the NOx concentration is 500mg/Nm3Firstly, the flue gas enters a flue gas heat exchanger 1 to be preheated to 160 ℃. The flue gas heat exchanger 1 adopts a rotary heat exchanger, and the high-temperature flue gas at the outlet of the denitration reactor is fully utilized to conduct heat transfer and temperature rise on the low-temperature sintering flue gas.
4 pre-mixing burners are arranged in the denitration inlet flue 5, coke oven gas is used as fuel, sintering flue gas with high oxygen content is used as auxiliary hot air, and the preheated flue gas is further heated to 200 ℃ through the combustion of the coke oven gas.
Then the smoke and the liquidThe reducing agent sprayed by the raw agent injection device 3 is uniformly mixed and enters the denitration reactor 6, and the NOx and NH in the flue gas are reacted under the action of the low-temperature SCR catalyst 43Reaction to produce N2And H2O, denitration efficiency reaches 80%, and outlet NOx concentration reaches 100mg/Nm3。
The denitration outlet flue gas is about 195 ℃, the waste heat is fully utilized to heat the inlet flue gas after passing through the flue gas heat exchanger 1, and finally the flue gas is discharged into the atmosphere through a chimney.
The above description is only for the preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. The utility model provides a steel sintering flue gas denitration system, locates after dust pelletizing system and desulfurization system, its characterized in that: comprises a denitration inlet flue (5), a denitration reactor (6) and a denitration outlet flue (7); a low-temperature SCR catalyst (4) is arranged in the denitration reactor (6); the denitration inlet flue (5) is connected with a flue gas inlet end of the denitration reactor (6), and a combustor (2) and a reducing agent injection device (3) are sequentially arranged on the denitration inlet flue along the flow direction of the flue gas; the denitration outlet flue (7) is connected to the flue gas outlet end of the denitration reactor (6), and the tail part of the denitration outlet flue is communicated with a chimney (8); the side-by-side parts of the denitration inlet flue (5) and the denitration outlet flue (7) are provided with flue gas heat exchangers (1) to realize heat exchange between high-temperature flue gas in the denitration outlet flue (7) and low-temperature flue gas in the denitration inlet flue (5);
the combustor (2) is a premixed flame combustor, the fuel of the combustor adopts coke oven gas, and combustion-supporting air adopts sintering flue gas;
the combustor (2) heats the flue gas to the optimal activity temperature of the low-temperature SCR catalyst (4), which is 180-200 ℃.
2. The steel sintering flue gas denitration system of claim 1, characterized in that: the number of the burners (2) is 1-10.
3. The steel sintering flue gas denitration system of claim 1, characterized in that: the flue gas temperature at the inlet of the denitration inlet flue (5) is 60-100 ℃, and the flue gas is preliminarily preheated to 160-170 ℃ through the flue gas heat exchanger (1).
4. The steel sintering flue gas denitration system of claim 1, characterized in that: the flue gas heat exchanger (1) is a rotary heat exchanger.
5. The denitration system for flue gas generated by sintering steel according to any one of claims 1 to 4, characterized in that: the low-temperature SCR catalyst (4) is one or more layers of honeycomb type, flat plate type or corrugated plate type catalysts, and a soot blower is arranged above the low-temperature SCR catalyst (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821681288.3U CN209828709U (en) | 2018-10-17 | 2018-10-17 | Iron and steel sintering flue gas denitration system |
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| CN201821681288.3U CN209828709U (en) | 2018-10-17 | 2018-10-17 | Iron and steel sintering flue gas denitration system |
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| CN209828709U true CN209828709U (en) | 2019-12-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151132A (en) * | 2020-02-28 | 2020-05-15 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature SCR device and process for improving denitration performance of coal-fired unit |
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2018
- 2018-10-17 CN CN201821681288.3U patent/CN209828709U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151132A (en) * | 2020-02-28 | 2020-05-15 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature SCR device and process for improving denitration performance of coal-fired unit |
| CN111151132B (en) * | 2020-02-28 | 2023-07-25 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature SCR device and process for improving denitration performance of coal-fired unit |
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Address after: 100039 room 901, 9 / F, building 1, yard 16, West Fourth Ring Middle Road, Haidian District, Beijing Patentee after: Guoneng Longyuan environmental protection Co.,Ltd. Address before: 100039 room 911, 1 building, 16 West Fourth Ring Road, Haidian District, Beijing. Patentee before: BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. |
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