CN1541756A - Calcium spraying catalytic desulfurization method in pulverized coal fired boiler and device thereof - Google Patents
Calcium spraying catalytic desulfurization method in pulverized coal fired boiler and device thereof Download PDFInfo
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- CN1541756A CN1541756A CNA200310112013XA CN200310112013A CN1541756A CN 1541756 A CN1541756 A CN 1541756A CN A200310112013X A CNA200310112013X A CN A200310112013XA CN 200310112013 A CN200310112013 A CN 200310112013A CN 1541756 A CN1541756 A CN 1541756A
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Abstract
The calcium spraying catalytic desulfurizing method inside coal powder boiler includes the following steps: conveying sulfur fixing agent from large bin to pumping sender; conveying the sulfur fixing agent with negative ion condensating and filtering drier processed compressed air to small bin; feeding the sulfur fixing agent to Venturi sender and nozzle together with air from Roots blower and spraying into hearth of coal powder boiler; and desulfurizing inside the hearth with the sulfur fixing agent. The relevant desulfurizing apparatus includes large bin, nozzles, coal powder furnace, negative ion condensating and filtering driers and compressed air source. The present invention realizes the automatic tracking control of the desulfurizing process.
Description
Technical Field
The invention relates to a method and a device for catalytic desulfurization by spraying calcium in a pulverized coal fired boiler.
Background
When coal is burnt, nitrogen oxides, sulfur dioxide and dust are generated and discharged into the sky to pollute the atmosphere, so that flue gas desulfurization and atmospheric pollution treatment are not slow at all. The in-furnace calcium spraying method is suitable for flue gas desulfurization of pulverized coal boilers, and during the combustion process, the sulfur fixing agent is sprayed into the main boiler, i.e. calcium is sprayed, and the sulfur fixing agent reacts with sulfur dioxide generated by coal combustion to generate sulfate, so that sulfur is left in slag, and the sulfur content of flue gas is reduced.
After a plurality of high-efficiency coal-fired composite sulfur-fixing agents are developed, the in-furnace calcium-spraying catalytic desulfurization technology of China has great progress, and the desulfurization rate is improved to about 70 percent from the original 30 percent. However, how to convey the powdery sulfur-fixing agent to a proper temperature area in a hearth without blockage and react with SO in less than 1 second2The gas is uniformly mixed, the function of the sulfur fixing agent is fully exerted, and a set of in-furnace calcium spraying catalytic desulfurization method and a reliable and advanced device thereof are needed.
Disclosure of Invention
The technical problems to be solved by the invention are as follows:
the method is characterized in that the high-efficiency coal-fired composite sulfur-fixing agent is conveyed without blockage according to the requirements of a desulfurization process, is sprayed to a proper temperature area in a furnace and fully plays the role of the high-efficiency coal-fired composite sulfur-fixing agent, and realizes full-automatic tracking control.
The invention also provides a device for implementing the calcium-spraying catalytic desulfurization method in the pulverized coal fired boiler.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for catalytic desulfurization by spraying calcium in a pulverized coal fired boiler comprises the following steps:
1. a method for catalytic desulfurization by spraying calcium in a pulverized coal fired boiler is characterized in that: the method comprises the following steps:
(1) conveying the sulfur-fixing agent from a large storage bin to a bin pump transmitter;
(2) the bin pump generator adopts a compressed air source treated by the anion condensation filtering dryer to convey the sulfur fixing agent to a small bin for storage;
(3) the sulfur-fixing agent is fed into the Venturi transmitter by the feeding, metering and controlling of the rotary feeder, and is conveyed together with the blast of the Roots blower by the dilute phaseEnters the nozzle and is sprayed into the hearth 1150 of the pulverized coal furnace together with the secondary hot air+100 -50In the region ofDEG C;
(4) the sulfur-fixing agent completes the desulfurization reaction in the hearth of the pulverized coal furnace.
Wherein the natural environment air source enters the Roots blower in the step (3) after being treated by the anion filter dryer.
A device for realizing the calcium-spraying catalytic desulfurization method in the pulverized coal fired boiler comprises the following components:
the large storage bin is used for storing the sulfur fixing agent;
the dense-phase conveying pipeline seals the sulfur fixing agent and conveys the dense phase to the small storage bin;
the small storage bin stores the sulfur fixing agent and creates conditions for changing dense-phase conveying into dilute-phase conveying;
controller according to boiler load or SO2The signal of the on-line monitor controls and adjusts the rotating speed of the rotary feeder;
secondary hot air for the spray nozzle to diffuse the sulfur-fixing agent;
the air pipe conveys secondary hot air;
a nozzle to achieve a desired spray velocity and spread angle;
the standby nozzle is switched for standby according to different loads of the boiler;
pulverized coal furnace for generating SO by burning coal2And react with sulfur-fixing agent to produce sulfate;
the dilute phase conveying pipeline is used for sealing the dilute phase and conveying the sulfur fixing agent to the nozzle;
turning a blanking device, blanking, metering and controlling;
the Venturi transmitter is used for realizing dilute phase transmission;
the RoxSet fan supplies air energy to the Venturi transmitter;
the negative ion condensation filtering dryer is used for filtering, dehydrating, drying and negatively ionizing air so as to improve the oxidation and catalysis of the air;
a bin pump transmitter for transmitting the sulfur fixing agent in a dense phase;
and the compressed air source is used for providing air energy for the bin pump transmitter.
The arrangement of the nozzles and the spare nozzles is 2-4 layers, 2-6 nozzles are arranged on each layer, are arranged at different elevation positions of a hearth of the pulverized coal furnace 9 and are distributed on a front wall, a side wall or four corners.
The controller is based on the load signal or SO of the boiler2The signal of the on-line monitor adjusts the rotating speed of the rotary feeder to adjust the spraying amount of the sulfur-fixing agent.
Anion condensation desicator be the utility model discloses a designer's yunhong and Liu Handong in the utility model patent of 2003 9 month 1 day application to the Chinese patent office, application number is 032739960.5.
The working process of the invention is as follows: the compressed air source 17 enters the bin pump transmitter 15 after being treated by the anion condensation filtering dryer 16; the natural environment air source enters the Roots blower 13 after being treated by the anion filter dryer 14; the sulfur-fixing agent is delivered from a large bunker 1 to a small bunker 3 from a dense phase delivery pipe 2 through a bunker pump transmitter 15, then delivered into a Venturi transmitter 12 through a rotary feeder 11, blown air of a Roots blower 13 enters a nozzle 7 through a dilute phase delivery pipe 10 together with secondary hot air 5, and is sprayed into a hearth 1150 of a pulverized coal furnace 9+100 -50And in the temperature range, the desulfurization reaction is completed in a hearth of a pulverized coal furnace 9.
The utility model has the advantages that:
1. the invention adopts the anion condensation filtering dryer to filter, dehydrate, dry and ionize the air, thereby improving the oxidation and catalysis of the air;
2. the device for catalytic desulfurization by spraying calcium in the pulverized coal fired boiler is used for a 220t/h pulverized coal fired boiler, adopts AG-2 sulfur-fixing agent with desulfurization rate as high as 71.2 percent and sulfur SO2The discharge agricultural degree and the total amount reach the national standard, the investment is 1/7-1/4 of other desulphurization methods, the operation cost per degree of electricity is increased by less than 1 minute, and the occupied area is only 80m2。
3. The invention conveys the high-efficiency coal-fired composite sulfur-fixing agent without blockage according to the requirement of a desulfurization process, sprays the high-efficiency coal-fired composite sulfur-fixing agent to a proper temperature area in a furnace and fully plays the role of the high-efficiency coal-fired composite sulfur-fixing agent, thereby realizing full-automatic tracking control.
Drawings
FIG. 1 is a schematic diagram of a calcium-spraying catalytic desulfurization device in a pulverized coal fired boiler of the present invention.
In fig. 1: 1. the large storage bin is used for storing the sulfur-fixing agent; 2. the dense-phase conveying pipeline seals the sulfur fixing agent and conveys the dense phase to the small storage bin; 3. the smallstorage bin stores the sulfur fixing agent and creates conditions for changing dense-phase conveying into dilute-phase conveying; 4. controller according to boiler load or SO2The signal of the on-line monitor controls and adjusts the rotating speed of the rotary feeder; 5. secondary hot air for the spray nozzle to diffuse the sulfur-fixing agent; 6. the air pipe conveys secondary hot air; 7. a nozzle to achieve a desired spray velocity and spread angle; 8. the standby nozzle is switched for standby according to different loads of the boiler; 9. pulverized coal furnace for generating SO by burning coal2And reacting with a sulfur-fixing agentA sulfate producing device; 10. the dilute phase conveying pipeline is used for sealing the dilute phase and conveying the sulfur fixing agent to the nozzle; 11. turning a blanking device, blanking, metering and controlling; 12. the Venturi transmitter is used for realizing dilute phase transmission; 13. the RoxSet fan supplies air energy to the Venturi transmitter; 14. the negative ion condensation filtering dryer is used for filtering, dehydrating, drying and ionizing air, and improving the oxidation and catalysis of the air; 15. a bin pump transmitter for transmitting the sulfur fixing agent in a dense phase; 17. and the compressed air source is used for providing air energy for the bin pump transmitter.
Detailed Description
A method for catalytic desulfurization by spraying calcium in a pulverized coal fired boiler comprises the following steps:
(1) conveying the sulfur-fixing agent from a large storage bin to a bin pump transmitter;
(2) the bin pump generator adopts a compressed air source treated by the anion condensation filtering dryer to convey the sulfur fixing agent to a small bin for storage;
(3) the sulfur-fixing agent is fed into the Venturi transmitter by the feeding, metering and controlling of the rotary feeder, is conveyed into the nozzle together with the blast air of the Roots blower by the dilute phase, and is sprayed into the hearth 1150 of the pulverized coal furnace together with the secondary hot air+100 -50In the region of DEG C;
(4) and the desulfurization reaction is completed in the furnace chamber of the sulfur-fixing agent pulverized coal furnace.
The sulfur-fixing agent with patent number ZL01114874.8 is mainly prepared by taking limestone as a main raw material, adding auxiliary agents, catalysts, carrier auxiliary materials and other non-toxic and harmless natural minerals and industrial waste materials in the grinding process, has three functions, and has the following chemical reaction processes:
(use CaSO)4The surface is covered with a layer of very thin composite salt to delay the re-pyrolysis and improve the sulfur fixation rate. )
As shown in fig. 1, in the device for implementing the method for catalytic desulfurization by spraying calcium into the pulverized coal fired boiler, a compressed air source 17 enters a bin pump transmitter 15 after being treated by a negative ion condensation filter dryer 16; the natural environment air source enters the Roots blower 13 after being treated by the anion filter dryer 14; the sulfur-fixing agent passes through the bin pump transmitter 15 from the large material bin 1 and is formed by dense phaseThe blast air from the conveying pipeline 2 to the small storage bin 3, the blast air from the rotary feeder 11 to the Venturi transmitter 12 and the Roots blower 13 enters the nozzle 7 through the dilute phase conveying pipeline 10 and is sprayed into the hearth 1150 of the pulverized coal furnace 9 together with the secondary hot air 5+100 -50And in the temperature range, the desulfurization reaction is completed in a hearth of a pulverized coal furnace 9. The spare nozzles 8 are arranged in 2-4 layers, 2-6 nozzles in each layer are arranged at positions with different elevations in a hearth of the pulverized coal furnace 9 and are divided into three injection modes of a front wall, a side wall and four corners, only 1-2 layers of nozzles are used during working, and automatic switching can be realized. The whole set of device is controlled by a controller 4 according to the load signal or SO of the boiler2The signal of the on-line monitor adjusts the rotating speed of the rotary feeder to adjust the spraying amount of the sulfur fixing agent, thereby realizing automatic control.
The device is used for a 220t/h pulverized coal boilerThe desulfurization rate of AG-2 sulfur-fixing agent is up to 71.2%, and SO is adopted2The discharge agricultural degree and the total amount reach the national standard, the investment is 1/7-1/4 of other desulphurization methods, the operation cost per degree of electricity is increased by less than 1 minute, and the occupied area is only 80m2。
Claims (5)
1. A method for catalytic desulfurization by spraying calcium in a pulverized coal fired boiler is characterized in that: the method comprises the following steps:
(1) conveying the sulfur-fixing agent from a large storage bin to a bin pump transmitter;
(2) the bin pump generator adopts a compressed air source treated by the anion condensation filtering dryer to convey the sulfur fixing agent to a small bin for storage;
(3) the sulfur-fixing agent is fed into the Venturi transmitter by the feeding, metering and controlling of the rotary feeder, is conveyed into the nozzle together with the blast air of the Roots blower by the dilute phase, and is sprayed into the hearth 1150 of the pulverized coal furnace together with the secondary hot air+100 -50In the region of DEG C;
(4) the sulfur-fixing agent completes the desulfurization reaction in the hearth of the pulverized coal furnace.
2. The method for catalytic desulfurization by calcium injection in the pulverized coal fired boiler as defined in claim 1, wherein: and (4) the natural environment air source enters the Roots blower in the step (3) after being treated by the anion filter dryer.
3. An apparatus for implementing the method of claim 1 or 2, characterized in that the apparatus comprises:
the large storage bin (1) is used for storing a sulfur fixing agent;
the dense-phase conveying pipeline (2) seals the sulfur fixing agent, and dense-phase conveying is carried to the small bunker (3);
the small storage bin (3) is used for storing the sulfur fixing agent and creating conditions for changing dense-phase conveying into dilute-phase conveying;
a controller (4) according to the boiler load or SO2The signal of the on-line monitor controls and adjusts the rotating speed of the rotary feeder;
secondary hot air (5) for the spray nozzle to diffuse the sulfur-fixing agent;
an air duct (6) for conveying secondary hot air;
a nozzle (7) for achieving a desired spray velocity and spread angle;
a standby nozzle (8) which is switched for standby according to different loads of the boiler;
a pulverized coal furnace (9) for generating SO by burning coal2And react with sulfur-fixing agent to produce sulfate;
a dilute phase conveying pipeline (10) for sealing the dilute phase and conveying the sulfur fixing agent to the nozzle;
a rotary blanking device (11) for blanking, metering and controlling;
a venturi emitter (12) to effect dilute phase transport;
a Roxsecondary fan (13) supplying air energy to the Venturi transmitter (12);
the anion condensation filtering dryer (14, 16) filters, dehydrates, dries and ionizes the air negatively, improves the oxidation and catalysis of the air;
a bin pump transmitter (15) for transmitting the sulfur fixing agent in a dense phase;
a compressed air source (17) to provide air energy to the bin pump transmitter.
4. The apparatus of claim 3, wherein: the arrangement of the nozzles (7, 8) is 2-4 layers, each layer is 2-6, the nozzles are arranged at the positions of different elevations of a hearth of the pulverized coal furnace (9) and are distributed on a front wall, a side wall or four corners.
5. The apparatus of claim 3 or 4, wherein: the controller (4) is used for controlling the boiler according to the load signal or SO of the boiler2The signal of the on-line monitor adjusts the rotating speed of the rotary feeder (11) to adjust the spraying amount of the sulfur-fixing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310112013 CN1234445C (en) | 2003-11-05 | 2003-11-05 | Calcium spraying catalytic desulfurization method in pulverized coal fired boiler and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310112013 CN1234445C (en) | 2003-11-05 | 2003-11-05 | Calcium spraying catalytic desulfurization method in pulverized coal fired boiler and device thereof |
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| CN1541756A true CN1541756A (en) | 2004-11-03 |
| CN1234445C CN1234445C (en) | 2006-01-04 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327939C (en) * | 2005-05-09 | 2007-07-25 | 刘汉东 | High-efficient catalyzing smoke desulfurizing and denitrifying method and apparatus thereof |
| CN101879410A (en) * | 2010-07-20 | 2010-11-10 | 辽宁科林环保工程有限责任公司 | Controllable flue gas desulfurization method and system for coal-fired power station boiler |
| CN102179162A (en) * | 2011-05-13 | 2011-09-14 | 上海汉卓能源科技有限公司 | Device and method for conveying oxidation air and dry desulfurizing agent |
| CN102210971A (en) * | 2010-04-07 | 2011-10-12 | 华盛江泉集团有限公司 | Circulating fluidized bed boiler desulfurizer |
| CN102716662A (en) * | 2012-07-10 | 2012-10-10 | 中电投远达环保工程有限公司 | Dry powder pneumatic-conveying and direct-feeding desulphurization system |
| CN103611411A (en) * | 2013-12-04 | 2014-03-05 | 无锡雪浪环境科技股份有限公司 | Dry denitration processing device in furnace |
| CN103958031A (en) * | 2011-09-29 | 2014-07-30 | 巴布科克和威尔科克斯能量产生集团公司 | Dry sorbent injection during non-steady state conditons in dry scrubber |
| CN111249895A (en) * | 2020-03-09 | 2020-06-09 | 湛江市粤丰环保电力有限公司 | Dry powder injection deacidification method for deacidification agent in drying section area of garbage incinerator |
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2003
- 2003-11-05 CN CN 200310112013 patent/CN1234445C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327939C (en) * | 2005-05-09 | 2007-07-25 | 刘汉东 | High-efficient catalyzing smoke desulfurizing and denitrifying method and apparatus thereof |
| CN102210971A (en) * | 2010-04-07 | 2011-10-12 | 华盛江泉集团有限公司 | Circulating fluidized bed boiler desulfurizer |
| CN102210971B (en) * | 2010-04-07 | 2013-04-10 | 华盛江泉集团有限公司 | Circulating fluidized bed boiler desulfurizer |
| CN101879410A (en) * | 2010-07-20 | 2010-11-10 | 辽宁科林环保工程有限责任公司 | Controllable flue gas desulfurization method and system for coal-fired power station boiler |
| CN101879410B (en) * | 2010-07-20 | 2012-12-26 | 辽宁科林环保工程有限责任公司 | Controllable flue gas desulfurization method and system for coal-fired power station boiler |
| CN102179162A (en) * | 2011-05-13 | 2011-09-14 | 上海汉卓能源科技有限公司 | Device and method for conveying oxidation air and dry desulfurizing agent |
| CN103958031A (en) * | 2011-09-29 | 2014-07-30 | 巴布科克和威尔科克斯能量产生集团公司 | Dry sorbent injection during non-steady state conditons in dry scrubber |
| CN103958031B (en) * | 2011-09-29 | 2017-03-29 | 巴布科克和威尔科克斯能量产生集团公司 | Dry sorbent injection in dry scrubber under unsteady state condition |
| CN102716662A (en) * | 2012-07-10 | 2012-10-10 | 中电投远达环保工程有限公司 | Dry powder pneumatic-conveying and direct-feeding desulphurization system |
| CN103611411A (en) * | 2013-12-04 | 2014-03-05 | 无锡雪浪环境科技股份有限公司 | Dry denitration processing device in furnace |
| CN111249895A (en) * | 2020-03-09 | 2020-06-09 | 湛江市粤丰环保电力有限公司 | Dry powder injection deacidification method for deacidification agent in drying section area of garbage incinerator |
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| CN1234445C (en) | 2006-01-04 |
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