CN202709159U - Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device - Google Patents

Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device Download PDF

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Publication number
CN202709159U
CN202709159U CN 201220321747 CN201220321747U CN202709159U CN 202709159 U CN202709159 U CN 202709159U CN 201220321747 CN201220321747 CN 201220321747 CN 201220321747 U CN201220321747 U CN 201220321747U CN 202709159 U CN202709159 U CN 202709159U
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CN
China
Prior art keywords
boiler
flue
heat
load
exchanger rig
Prior art date
Application number
CN 201220321747
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Chinese (zh)
Inventor
易广宙
刘毅
莫春鸿
沈维君
张剑
贺益中
Original Assignee
东方电气集团东方锅炉股份有限公司
国电浙江北仑第三发电有限公司
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Priority to CN 201220321747 priority Critical patent/CN202709159U/en
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Publication of CN202709159U publication Critical patent/CN202709159U/en

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Abstract

The utility model discloses a boiler capable of meeting the full-load operation low exhaust temperature of an SCR denitration device, and relates to a boiler device. The boiler comprises the SCR denitration device, and further comprises a front heat transfer unit, a rear heat transfer unit and a bypass flue, wherein the front heat transfer unit is arranged in flue space in front of the SCR denitration device, the rear heat transfer unit is arranged in flue space behind the SCR denitration device, the bypass flue is provided with baffles with adjustable opening degrees, and the bypass flue is communicated with front flue space of the front heat transfer unit and flue space between the front heat transfer unit and the SCR denitration device. The SCR denitration device can be put into operation during high load and low load, so that the SCR denitration device is favorable to the nitrogen oxide emission, and meets the environment protection requirements; and simultaneously, the boiler can be guaranteed to have low exhaust temperatures under the high load and the low load, and saves fire coal consumption amount.

Description

A kind of boiler that satisfies the low exhaust gas temperature of SCR denitrification apparatus full load operation
Technical field
The utility model relates to a kind of station boiler system.
Background technology
The conventional power plant boiler, in the middle of whole boiler smoke flow process, the afterbody boiler heating surface before the air preheater is economizer, purpose is to reduce preheater import cigarette temperature, saves coal-fired consumption.The SCR denitrification apparatus is arranged between economizer and the preheater.The SCR denitrification apparatus of station boiler is the SCR class at present, and the common operating temperature range of the catalyst of employing is between 300~400 ℃.Surpass the temperature range catalyst and can not bring into play due effect.In the conventional boiler design, there are the following problems in meeting: when unit load was higher, denitrification apparatus import cigarette temperature was just in time in the normal range of operation of catalyst; And when unit load was low, the denitrification apparatus input gas temperature was lower, is lower than the normal serviceability temperature of catalyst.If when underload the design cigarette temperature of denitrification apparatus import is brought up to the requirement of satisfying catalyst, then import cigarette Wen Huigeng is high when high load capacity, causes high fume temperature, and boiler efficiency is low, and coal consumption amount is large.Therefore, all design by satisfying lower exhaust gas temperature when the high load capacity generally speaking, this will cause power plant the denitrification apparatus off-the-line can only be moved at underload.This has been not suitable with the requirement of up-to-date power plant's discharged nitrous oxides index.
The utility model content
The purpose of this utility model is: propose a kind of layout of boiler system, its SCR denitrification apparatus can all can put into operation when high load capacity and underload, is beneficial to reduce the discharging of nitrogen oxide, satisfies the requirement of environmental protection; Simultaneously guarantee that again boiler has lower exhaust gas temperature under high load capacity and the underload, save coal-fired consumption.
The purpose of this utility model realizes by following technical proposals:
A kind of boiler that satisfies the low exhaust gas temperature of SCR denitrification apparatus full load operation, comprise the SCR denitrification apparatus, also comprise the front heat-exchanger rig of being located in the front flue space of SCR denitrification apparatus, the rear heat-exchanger rig in the flue space behind the SCR denitrification apparatus, and the bypass flue that is provided with the baffle plate of adjustable opening, the front flue space of heat-exchanger rig was to the flue space between front heat-exchanger rig and the SCR denitrification apparatus before described bypass flue was communicated with.
As optimal way, described front heat-exchanger rig is comprised of at least one economizer.
As optimal way, described rear heat-exchanger rig is comprised of at least one economizer.
As optimal way, described bypass flue is composed in parallel by at least one flue.
As further preferred embodiment, the heat transferring medium pipeline connection of described forward and backward heat-exchanger rig, and the outlet of the heat transferring medium pipeline of rear heat-exchanger rig is communicated to the heat transferring medium pipeline entrance of front heat-exchanger rig.
Workflow of the present utility model: during high load capacity, close the bypass flue baffle plate, flue gas is reduced to about 350 ℃ by front heat-exchanger rig temperature and enters the SCR denitrification apparatus after (catalysis valency optimal temperature), then enter rear heat-exchanger rig, after the cigarette temperature further reduces, enter preheater, finally reduce exhaust gas temperature; During underload, open or regulate the bypass flue baffle opening, flue gas mainly maintains about 350 ℃ by front heat-exchanger rig temperature by the bypass flue part and enters the SCR denitrification apparatus after (catalysis valency optimal temperature), then enter rear heat-exchanger rig, after the cigarette temperature further reduces, enter preheater, finally reduce exhaust gas temperature.
The beneficial effects of the utility model: no matter at high load capacity or underload, the SCR denitrification apparatus can put into operation, and exhaust gas temperature is all at reduced levels simultaneously.In the full load range of operation, not only satisfy the discharged nitrous oxides requirement, also guaranteed higher boiler efficiency, accomplished high-efficiency low-pollution.
Description of drawings
Fig. 1 is the device schematic flow sheet of the utility model embodiment 1;
Among the figure, 1 is burner hearth, and 2 is the SCR denitrification apparatus, and 3 is bypass flue, and 4 is baffle plate, and 5 is economizer A, and 6 is economizer B, and 7 is air preheater.
The specific embodiment
Below in conjunction with specific embodiments and the drawings the utility model is further described.
As shown in Figure 1, a kind of boiler that satisfies the low exhaust gas temperature of SCR denitrification apparatus full load operation comprises SCR denitrification apparatus 2, also comprises economizer A 5, economizer B 6.Before economizer A 5 was arranged in SCR denitrification apparatus 2, after economizer B 6 was arranged in SCR denitrification apparatus 2, particular location was determined according to flue structure; Economizer A 5 and economizer B 6 are arranged in series in the carbonated drink flow process, and intraductal working medium flows to economizer A 5 by economizer B 6.This boiler increases roadside road flue 3 at the economizer A before SCR denitrification apparatus 2 on the flue gas flow 5, and the entrance of this bypass flue 3 is positioned at the flue before this economizer A 5, the flue that outlet is arrived between the SCR denitrification apparatus 2 at this economizer A 5; Gas proportioning damper 4 is set before the bypass flue 3, and baffle plate 4 is opened as required or is closed, and can regulate; Economizer A 5 and economizer B 6 main bodys are made of single or plural steel pipe parallel connection.Steel pipe can be light pipe or band all kinds fin or annex.
The flue gas that fuel and air burn in burner hearth 1 and generate behind the horizontal segment flue of flowing through, enters rear vertical well gas flue.During high load capacity, close the baffle plate 4 of bypass flue 3, flue gas enters SCR denitrification apparatus 2 by after economizer A 5 heat exchange; During underload, open the baffle plate 4 of bypass flue 3, flue gas directly enters SCR denitrification apparatus 2.Flue gas enters economizer B 6 through 2 outlets of SCR denitrification apparatus, further reduces the cigarette temperature.Flue gas is discharged after changing 7 heat by preheater at last.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims (5)

1. one kind can be satisfied the boiler that exhaust gas temperature is hanged down in the operation of SCR denitrification apparatus full load, comprise the SCR denitrification apparatus, it is characterized in that: also comprise the front heat-exchanger rig of being located in the front flue space of SCR denitrification apparatus, the rear heat-exchanger rig in the flue space behind the SCR denitrification apparatus, and the bypass flue that is provided with the baffle plate of adjustable opening, the front flue space of heat-exchanger rig was to the flue space between front heat-exchanger rig and the SCR denitrification apparatus before described bypass flue was communicated with.
2. the boiler that satisfies the low exhaust gas temperature of SCR denitrification apparatus full load operation as claimed in claim 1, it is characterized in that: described front heat-exchanger rig is comprised of at least one economizer.
3. the boiler that satisfies the low exhaust gas temperature of SCR denitrification apparatus full load operation as claimed in claim 1, it is characterized in that: described rear heat-exchanger rig is comprised of at least one economizer.
4. the boiler that satisfies the low exhaust gas temperature of SCR denitrification apparatus full load operation as claimed in claim 1, it is characterized in that: described bypass flue is composed in parallel by at least one flue.
5. such as the described boiler that satisfies the low exhaust gas temperature of SCR denitrification apparatus full load operation of arbitrary claim in the claim 1 to 4, it is characterized in that: the heat transferring medium pipeline connection of described forward and backward heat-exchanger rig, and the outlet of the heat transferring medium pipeline of rear heat-exchanger rig is communicated to the heat transferring medium pipeline entrance of front heat-exchanger rig.
CN 201220321747 2012-07-05 2012-07-05 Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device CN202709159U (en)

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CN 201220321747 CN202709159U (en) 2012-07-05 2012-07-05 Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device

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CN 201220321747 CN202709159U (en) 2012-07-05 2012-07-05 Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102927577A (en) * 2012-11-20 2013-02-13 上海锅炉厂有限公司 Flue distribution manner applied to negative omnidistance load commissioning of denitration equipment
CN103486566A (en) * 2013-09-17 2014-01-01 西安西热锅炉环保工程有限公司 Waste heat utilization system capable of guaranteeing lignite boiler dry output and SCR safe flue gas temperature
CN103807863A (en) * 2014-01-24 2014-05-21 上海发电设备成套设计研究院 Improved smoke temperature adjusting system for selective catalytic reduction
CN103968402A (en) * 2014-04-24 2014-08-06 江苏申港锅炉有限公司 Flue gas denitrification system of coal-fired unit
CN104132358A (en) * 2014-06-12 2014-11-05 广东电网公司电力科学研究院 Coal-fired power plant boiler system suitable for low-load operation and combustion adjusting method of boiler system
CN105423322A (en) * 2015-12-17 2016-03-23 华电郑州机械设计研究院有限公司 Low-load system increasing denitration flue gas temperature
CN106642177A (en) * 2016-09-21 2017-05-10 天津市电力科技发展有限公司 System for increasing smoke temperature at denitration inlet under low load
CN109442375A (en) * 2018-10-09 2019-03-08 中国神华能源股份有限公司 Boiler system
CN109780566A (en) * 2013-05-23 2019-05-21 电源开发株式会社 Steam power plant
CN110822461A (en) * 2019-11-01 2020-02-21 华电电力科学研究院有限公司 Method for realizing wide-load denitration by bypass grading economizer

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102927577A (en) * 2012-11-20 2013-02-13 上海锅炉厂有限公司 Flue distribution manner applied to negative omnidistance load commissioning of denitration equipment
CN102927577B (en) * 2012-11-20 2015-02-18 上海锅炉厂有限公司 Flue distribution manner applied to negative omnidistance load commissioning of denitration equipment
CN109780566A (en) * 2013-05-23 2019-05-21 电源开发株式会社 Steam power plant
CN103486566A (en) * 2013-09-17 2014-01-01 西安西热锅炉环保工程有限公司 Waste heat utilization system capable of guaranteeing lignite boiler dry output and SCR safe flue gas temperature
CN103807863A (en) * 2014-01-24 2014-05-21 上海发电设备成套设计研究院 Improved smoke temperature adjusting system for selective catalytic reduction
CN103807863B (en) * 2014-01-24 2018-02-13 上海发电设备成套设计研究院 A kind of cigarette temperature controlling system for SCR transformation
CN103968402A (en) * 2014-04-24 2014-08-06 江苏申港锅炉有限公司 Flue gas denitrification system of coal-fired unit
CN104132358A (en) * 2014-06-12 2014-11-05 广东电网公司电力科学研究院 Coal-fired power plant boiler system suitable for low-load operation and combustion adjusting method of boiler system
CN105423322A (en) * 2015-12-17 2016-03-23 华电郑州机械设计研究院有限公司 Low-load system increasing denitration flue gas temperature
CN106642177B (en) * 2016-09-21 2019-01-22 天津市电力科技发展有限公司 The system of denitration inlet flue gas temperature under a kind of raising underload
CN106642177A (en) * 2016-09-21 2017-05-10 天津市电力科技发展有限公司 System for increasing smoke temperature at denitration inlet under low load
CN109442375A (en) * 2018-10-09 2019-03-08 中国神华能源股份有限公司 Boiler system
CN110822461A (en) * 2019-11-01 2020-02-21 华电电力科学研究院有限公司 Method for realizing wide-load denitration by bypass grading economizer

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