CN105318324A - Application technology of biomass gasification gas in coal-fired boiler - Google Patents
Application technology of biomass gasification gas in coal-fired boiler Download PDFInfo
- Publication number
- CN105318324A CN105318324A CN201510739748.8A CN201510739748A CN105318324A CN 105318324 A CN105318324 A CN 105318324A CN 201510739748 A CN201510739748 A CN 201510739748A CN 105318324 A CN105318324 A CN 105318324A
- Authority
- CN
- China
- Prior art keywords
- boiler
- biomass gasified
- gasified gas
- air
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses an application technology of biomass gasification gas in a coal-fired boiler. The application technology comprises the following steps that 1, primary air is blown into the boiler from the bottom of a boiler hearth and is composed of air blown in by an air blower and flue gas reused through a chimney; 2, biomass gasification gas nozzles are arranged on the upper portion and the lower portion of a secondary air inlet of the boiler wall respectively; in a main combustion area of the boiler, secondary air and coal powder are subjected to high-temperature combustion after being mixed, the biomass gasification gas is sprayed into the boiler from the biomass gasification gas nozzles, and the coal powder burning at high temperature is mixed with the biomass gasification gas for burning; 3, tertiary air is blown into a burn-out area of the boiler and is composed of air blown into the boiler by the air blower and the flue gas reused through the chimney; and 4, a reducing agent is sprayed in at an outlet of a cyclone separator. According to the technology of the biomass gasification gas in the coal-fired boiler, as the biomass gasification gas made from agricultural and forestry residues is low in ash content, ideal reburning raw materials are provided for the boiler; moreover, N separating out of fuel is effectively suppressed to be converted into NOX.
Description
Technical field
The present invention relates to boiler environmental technology field, the particularly biomass gasified gas technique for applying in coal-burning boiler.
Background technology
The pollutant of fuel combustion discharge is the major part of atmosphere pollution, and the NOx produced that wherein burns is one of main component causing acid rain, and its environmental problem caused allows of no optimist, and coal-fired process is one of main source of NOx.China is coal big country, and coal occupies very large ratio in primary energy consumption, and nearest decades this energy resource structure may can not change.Economic quick growth is with the huge consumption of the energy for cost, and the NOx total release of China is from the 12.1 × 106t of 2000 to the 19.1 × 106t of 2005, and annual growth is 10%, and the discharge therefore reducing NOx has been very urgent." 12 " planning is also using reducing the discharge of nitrogen oxide as the most important thing improving atmosphere quality.
For typical coal-fired boiler, NOx produces mainly through fuel type constructive ways.Generation and the destruction of NOx are relevant with following factor: (1) burning of coal mode, combustion conditions, and its output depends on ignition temperature level; (2) coal characteristic; (3) atmosphere of reaction zone flue gas in burner hearth, i.e. oxygen in flue gas, nitrogen, NO and C
nh
ncontent; (4) fuel and the time of staying of combustion product in flame high-temperature region and burner hearth.Reduce NOx emission measure and be divided into one-level denitride technology and secondary denitride technology.One-level denitride technology is mainly adopted the low burner of NOx and is adjusted by burning optimization, effectively the generation of control NOx, reduces NOx generation amount from source; Secondary denitride technology is then reduce the discharge having generated NOx as far as possible.If these two kinds of technology can be combined, then can reduce the NOx content in flue gas further.
Summary of the invention
The invention provides the technique for applying of biomass gasified gas in coal-burning boiler, can the generation of effective control NOx, and the discharge generating NOx can be reduced further.
For achieving the above object, technical scheme of the present invention is:
The technique for applying of biomass gasified gas in coal-burning boiler, comprises the following steps:
Step 1: blast First air bottom boiler furnace, the flue gas of the air that First air is blasted by air blast and chimney reuse forms;
Step 2: in the upper and lower of boiler wall Secondary Air entrance, is furnished with biomass gasified gas spout respectively; In the main combustion zone of boiler, carry out high-temp combustion after Secondary Air mixes with coal dust, spray into biomass gasified gas from biomass gasified gas spout, and make biomass gasified gas form eddy flow, the coal dust of high-temp combustion mixes with biomass gasified gas, makes established N in biomass gasified gas and main combustion zone
2o reacts; Under the cyclonic action of biomass gasified gas, coal dust by impacting further the ash content removing its surface, thus mixes with Secondary Air and realizes burning again;
Step 3: blast tertiary air at the burning-out zone of boiler, the flue gas of the air that tertiary air is blasted by air blast and chimney reuse forms;
Step 4: the flue gas that boiler combustion produces enters cyclone separator from boiler furnace top, carries out gas solid separation through cyclone separator, the gas of separation is discharged from cyclone separator top, and exit is provided with spray gun, and spray gun sprays into reducing agent by the NO in flue gas
xbe reduced to N
2.
Further, the composition of described biomass gasified gas comprises C
nh
n, H
2and CO, wherein, CH
4account for biomass gasified gas more than 50%.
Further, in described step 1, air mixes with flue gas, and the oxygen concentration of gaseous mixture is 16 ~ 20%.
Preferably, be arranged in the biomass gasified gas spout of Secondary Air entrance bottom, the flow velocity spraying into biomass gasified gas is 45 ~ 50m/s.
Preferably, be arranged in the biomass gasified gas spout on Secondary Air entrance top, the flow velocity spraying into biomass gasified gas is 55 ~ 60m/s.
Further, in the upper and lower of boiler wall Secondary Air entrance, be respectively provided with a circle biomass gasified gas spout group, often enclose biomass gasified gas spout group and include equidistant several biomass gasified gas spouts arranged.
Preferably, the spray angle that upper circle biomass gasified gas spout and furnace wall are formed is 75 ~ 85 °, and the spray angle that lower circle biomass gasified gas spout and furnace wall are formed is 65 ~ 75 °; Preferred, the inner side of described boiler wall, be provided with the spiral board arranged with the gas blowout mouth one_to_one corresponding that gasifies, the angle that spiral board and furnace wall are formed is identical with corresponding biomass gasified gas spout.
Preferably, the oxygen-supplying amount of described First air is 16 ~ 20% of fuel combustion oxygen demand; The oxygen-supplying amount of Secondary Air is 75 ~ 78% of fuel combustion oxygen demand; The oxygen-supplying amount of tertiary air is 2 ~ 9% of fuel combustion oxygen demand
The present invention has the following advantages:
(1) utilize chimney smoke to circulate to burn again, the heat energy of flue gas can be made full use of, improve the efficiency of combustion of boiler, reach energy-conservation object;
(2) biomass gasified gas utilizing agriculture and forestry organic waste material to prepare, content of ashes is low, desirable fires raw material again, adding of biomass gasified gas, the NOx generated is reduced to N for boiler provides
2, in addition, also can make unburned coal dust under the cyclonic action of biomass gasified gas, increase the probability contacted with oxygen, thus burn again in anoxic atmosphere, effectively inhibit the N separated out in fuel to be converted into NO
x;
(3) the gas outlet tube place of cyclone separator is provided with spray gun and sprays into reducing agent, further minimizing has generated the discharge of NOx.
Accompanying drawing explanation
Fig. 1 is the boiler plant structural representation that the present invention uses;
In figure, boiler 1, biomass gasified gas spout 2, Secondary Air entrance 3, air enters pipeline 4, flue gas reuse pipeline 5, First air spout 6, cyclone separator 7, spray gun 8, spiral board 9, tertiary air entrance 10.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention and range of application are not limited to following examples:
Embodiment 1
The technique for applying of biomass gasified gas in coal-burning boiler, comprises the following steps:
Step 1: blast First air from boiler 1 burner hearth bottom, the flue gas of the air that First air is blasted by air blast and chimney reuse forms;
Step 2: in the upper and lower of boiler 1 furnace wall Secondary Air entrance 3, be furnished with biomass gasified gas spout 2 respectively; In the main combustion zone of boiler 1, carry out high-temp combustion after Secondary Air mixes with coal dust, spray into biomass gasified gas from biomass gasified gas spout 2, and make biomass gasified gas form eddy flow, the coal dust of high-temp combustion mixes with biomass gasified gas, makes established N in biomass gasified gas and main combustion zone
2o reacts; Under the cyclonic action of biomass gasified gas, coal dust by impacting further the ash content removing its surface, thus mixes with Secondary Air and realizes burning again;
Step 3: blast tertiary air at the burning-out zone of boiler, the flue gas of the air that tertiary air is blasted by air blast and chimney reuse forms;
Step 4: the flue gas that boiler combustion produces enters cyclone separator from boiler furnace top, carries out gas solid separation through cyclone separator, the gas of separation is discharged from cyclone separator top, and exit is provided with spray gun 8, and spray gun 8 sprays into reducing agent by the NO in flue gas
xbe reduced to N
2.
The composition of the biomass gasified gas used in step 2 comprises C
nh
n, H
2and CO, wherein, CH
4account for biomass gasified gas more than 50%.
In step 1, air mixes with flue gas, and the oxygen concentration of gaseous mixture is 16 ~ 20%.
For better suppressing the generation of thermal NO x, the oxygen-supplying amount of First air is 18% of fuel combustion oxygen demand; The oxygen-supplying amount of Secondary Air is 77% of fuel combustion oxygen demand; The oxygen-supplying amount of tertiary air is 5% of fuel combustion oxygen demand.
The boiler plant that this method uses, as shown in Figure 1, comprise First air entrance, Secondary Air entrance 3 and tertiary air entrance 10, in the upper and lower of boiler 1 furnace wall Secondary Air entrance, respectively be provided with a circle biomass gasified gas spout group, often enclose biomass gasified gas spout group and include equidistant several biomass gasified gas spouts 2 arranged; Wherein, the spray angle that upper circle biomass gasified gas spout 2 and furnace wall are formed is 75 ~ 80 °, and the spray angle that lower circle biomass gasified gas spout 2 and furnace wall are formed is 65 ~ 70 °; Wherein, the flow velocity that lower circle biomass gasified gas spout 2 sprays into biomass gasified gas is 48 ~ 50m/s; The flow velocity that upper circle biomass gasified gas spout 2 sprays into biomass gasified gas is 58 ~ 60m/s; In the exit of cyclone separator 7, be provided with spray gun 8.
For better forming eddy flow, in the inner side of boiler 1 furnace wall, be provided with the spiral board 9 arranged with the gas blowout mouth one_to_one corresponding that gasifies, the angle that spiral board 9 and furnace wall are formed is identical with corresponding biomass gasified gas spout 2.
This boiler uses biomass gasified gas to burn again, can reduce the fire coal of consumption 6.5%, make NO simultaneously
xremoval efficiency reaches more than 84%.
Embodiment 2
The technique for applying of biomass gasified gas in coal-burning boiler, comprises the following steps:
Step 1: blast First air from boiler 1 burner hearth bottom, the flue gas of the air that First air is blasted by air blast and chimney reuse forms;
Step 2: in the upper and lower of boiler 1 furnace wall Secondary Air entrance 3, be furnished with biomass gasified gas spout 2 respectively; In the main combustion zone of boiler 1, carry out high-temp combustion after Secondary Air mixes with coal dust, spray into biomass gasified gas from biomass gasified gas spout 2, and make biomass gasified gas form eddy flow, the coal dust of high-temp combustion mixes with biomass gasified gas, makes established N in biomass gasified gas and main combustion zone
2o reacts; Under the cyclonic action of biomass gasified gas, coal dust by impacting further the ash content removing its surface, thus mixes with Secondary Air and realizes burning again;
Step 3: blast tertiary air at the burning-out zone of boiler, the flue gas of the air that tertiary air is blasted by air blast and chimney reuse forms;
Step 4: the flue gas that boiler combustion produces enters cyclone separator from boiler furnace top, carries out gas solid separation through cyclone separator, the gas of separation is discharged from cyclone separator top, and exit is provided with spray gun 8, and spray gun 8 sprays into reducing agent by the NO in flue gas
xbe reduced to N
2.
The composition of the biomass gasified gas used in step 2 comprises C
nh
n, H
2and CO, wherein, CH
4account for biomass gasified gas more than 50%.
In step 1, air mixes with flue gas, and the oxygen concentration of gaseous mixture is 16 ~ 20%.
For better suppressing the generation of thermal NO x, the oxygen-supplying amount of First air is 16 ~ 20% of fuel combustion oxygen demand; The oxygen-supplying amount of Secondary Air is 75 ~ 78% of fuel combustion oxygen demand; The oxygen-supplying amount of tertiary air is 2 ~ 9% of fuel combustion oxygen demand
The boiler plant that this method uses, as shown in Figure 1, comprise First air entrance, Secondary Air entrance 3 and tertiary air entrance 10, in the upper and lower of boiler 1 furnace wall Secondary Air entrance, respectively be provided with a circle biomass gasified gas spout group, often enclose biomass gasified gas spout group and include equidistant several biomass gasified gas spouts 2 arranged; Wherein, the spray angle that upper circle biomass gasified gas spout 2 and furnace wall are formed is 80 ~ 85 °, and the spray angle that lower circle biomass gasified gas spout 2 and furnace wall are formed is 70 ~ 75 °; Wherein, the flow velocity that lower circle biomass gasified gas spout 2 sprays into biomass gasified gas is 45 ~ 48m/s; The flow velocity that upper circle biomass gasified gas spout 2 sprays into biomass gasified gas is 55 ~ 58m/s; In the exit of cyclone separator 7, be provided with spray gun 8.
For better forming eddy flow, in the inner side of boiler 1 furnace wall, be provided with the spiral board 9 arranged with the gas blowout mouth one_to_one corresponding that gasifies, the angle that spiral board 9 and furnace wall are formed is identical with corresponding biomass gasified gas spout 2.
This boiler uses biomass gasified gas to burn again, can reduce the fire coal of consumption 6.5%, make NO simultaneously
xremoval efficiency reaches more than 80%.
Claims (9)
1. the technique for applying of biomass gasified gas in coal-burning boiler, is characterized in that comprising the following steps:
Step 1: blast First air from boiler (1) burner hearth bottom, the flue gas of the air that First air is blasted by air blast and chimney reuse forms;
Step 2: in the upper and lower of boiler (1) furnace wall Secondary Air entrance (3), is furnished with biomass gasified gas spout (2) respectively; In the main combustion zone of boiler (1), high-temp combustion is carried out after Secondary Air mixes with coal dust, biomass gasified gas is sprayed into from biomass gasified gas spout (2), and make biomass gasified gas form eddy flow, the coal dust of high-temp combustion mixes with biomass gasified gas, makes established N in biomass gasified gas and main combustion zone
2o reacts; Under the cyclonic action of biomass gasified gas, coal dust by impacting further the ash content removing its surface, thus mixes with Secondary Air and realizes burning again;
Step 3: blast tertiary air at the burning-out zone of boiler, the flue gas of the air that tertiary air is blasted by air blast and chimney reuse forms;
Step 4: the flue gas that boiler combustion produces enters cyclone separator from boiler furnace top, gas solid separation is carried out through cyclone separator, the gas be separated is discharged from cyclone separator top, and exit is provided with spray gun (8), and spray gun (8) sprays into reducing agent by the NO in flue gas
xbe reduced to N
2.
2. the technique for applying of biomass gasified gas according to claim 1 in coal-burning boiler, is characterized in that:
The composition of described biomass gasified gas comprises C
nh
n, H
2and CO, wherein, CH
4account for biomass gasified gas more than 50%.
3. the technique for applying of biomass gasified gas according to claim 1 in coal-burning boiler, is characterized in that:
In described step 1, air mixes with flue gas, and the oxygen concentration of gaseous mixture is 16 ~ 20%.
4. the technique for applying of biomass gasified gas according to claim 1 in coal-burning boiler, is characterized in that:
Be arranged in the biomass gasified gas spout of Secondary Air entrance bottom, the flow velocity spraying into biomass gasified gas is 45 ~ 50m/s.
5. the technique for applying of biomass gasified gas according to claim 1 in coal-burning boiler, is characterized in that:
Be arranged in the biomass gasified gas spout on Secondary Air entrance top, the flow velocity spraying into biomass gasified gas is 55 ~ 60m/s.
6. the technique for applying of biomass gasified gas according to claim 1 in coal-burning boiler, is characterized in that:
In the upper and lower of boiler (1) furnace wall Secondary Air entrance (3), respectively be provided with a circle biomass gasified gas spout group, often enclose biomass gasified gas spout group and include equidistant several biomass gasified gas spouts (2) arranged.
7. the technique for applying of biomass gasified gas according to claim 6 in coal-burning boiler, is characterized in that:
The spray angle that upper circle biomass gasified gas spout (2) and furnace wall are formed is 75 ~ 85 °, and the spray angle that lower circle biomass gasified gas spout (2) and furnace wall are formed is 65 ~ 75 °.
8. the technique for applying of biomass gasified gas according to claim 7 in coal-burning boiler, is characterized in that:
The inner side of described boiler (1) furnace wall, be provided with the spiral board (9) arranged with the gas blowout mouth one_to_one corresponding that gasifies, spiral board (9) is identical with corresponding biomass gasified gas spout (2) with the angle that furnace wall is formed.
9. the technique for applying of biomass gasified gas according to claim 1 in coal-burning boiler, is characterized in that:
The oxygen-supplying amount of described First air is 16 ~ 20% of fuel combustion oxygen demand; The oxygen-supplying amount of Secondary Air is 75 ~ 78% of fuel combustion oxygen demand; The oxygen-supplying amount of tertiary air is 2 ~ 9% of fuel combustion oxygen demand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510739748.8A CN105318324A (en) | 2015-11-03 | 2015-11-03 | Application technology of biomass gasification gas in coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510739748.8A CN105318324A (en) | 2015-11-03 | 2015-11-03 | Application technology of biomass gasification gas in coal-fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105318324A true CN105318324A (en) | 2016-02-10 |
Family
ID=55246299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510739748.8A Pending CN105318324A (en) | 2015-11-03 | 2015-11-03 | Application technology of biomass gasification gas in coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105318324A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274986A (en) * | 2019-06-27 | 2019-09-24 | 河南省科学院能源研究所有限公司 | A kind of experimental method and device of biological fuel gas and coal coupling combustion |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433799A (en) * | 2008-12-04 | 2009-05-20 | 哈尔滨工业大学 | Selective non-catalytic reduction method for gasifying and atomizing biomass and used boiler |
| CN101881455A (en) * | 2010-07-09 | 2010-11-10 | 华北电力大学 | Biomass gas and coal dust mixed combustion process |
| CN101915419A (en) * | 2010-07-05 | 2010-12-15 | 华北电力大学 | Biomass gasified gas re-burning mode and system for coal-fired fluidized bed |
| CN104879748A (en) * | 2015-04-16 | 2015-09-02 | 哈尔滨工业大学 | Device and method for controlling NOx of circulating fluidized bed by coupling air staging and fuel staging |
-
2015
- 2015-11-03 CN CN201510739748.8A patent/CN105318324A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433799A (en) * | 2008-12-04 | 2009-05-20 | 哈尔滨工业大学 | Selective non-catalytic reduction method for gasifying and atomizing biomass and used boiler |
| CN101915419A (en) * | 2010-07-05 | 2010-12-15 | 华北电力大学 | Biomass gasified gas re-burning mode and system for coal-fired fluidized bed |
| CN101881455A (en) * | 2010-07-09 | 2010-11-10 | 华北电力大学 | Biomass gas and coal dust mixed combustion process |
| CN104879748A (en) * | 2015-04-16 | 2015-09-02 | 哈尔滨工业大学 | Device and method for controlling NOx of circulating fluidized bed by coupling air staging and fuel staging |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274986A (en) * | 2019-06-27 | 2019-09-24 | 河南省科学院能源研究所有限公司 | A kind of experimental method and device of biological fuel gas and coal coupling combustion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107355776B (en) | Combustion System of Boiler Burning Fine, method and the application of ultra-low NOx emission | |
| CN101050853B (en) | Method for reducing nitrogen oxide of powder coal boiler mixed burning gas fuel | |
| CN109058979B (en) | Cyclone furnace denitration system and method | |
| CN111006508A (en) | Cement production line low-nitrogen decomposing furnace and cement production line low-nitrogen denitration technical method | |
| CN103884013B (en) | Manifold type environment-friendly type fluidized-bed combustion boiler combustion method and device | |
| CN111964435A (en) | Pulverized coal decoupling combustion reduction NO of cement decomposing furnacexExhaust system and method | |
| CN105299628A (en) | Method for applying biomass gasified gases to coal-fired boiler | |
| CN107099336A (en) | Cement decomposing furnace high temperature tertiary air coal gasification fires NO_x Reduction by Effective system again | |
| CN202350013U (en) | W-shaped flame boiler | |
| CN105318321A (en) | Application method of biomass gasification gas in coal-fired boiler | |
| CN100455885C (en) | Method for burning of low nitrogen oxides in coal-burning boiler | |
| CN201187773Y (en) | Pulverized coal boiler using internal combustion type combustor | |
| CN105299630A (en) | Process for applying biomass gasified gases to coal burning process | |
| CN1312430C (en) | Biomass and powder coal mixed combustion and biomass recombusting and denitrating combustion apparatus | |
| CN105318324A (en) | Application technology of biomass gasification gas in coal-fired boiler | |
| CN204345619U (en) | A kind of burner reducing nitrogen oxide emission | |
| CN104315519B (en) | Low-pollution self-cleaning combustion method and device for high-nitrogen content combustible waste | |
| CN104089279B (en) | Low nitrogen burning system | |
| CN105318322A (en) | Coal combustion method and boiler device for reducing content of NOx in smoke | |
| CN105299624A (en) | Boiler combustion process for reducing content of NOx in smoke and boiler device | |
| CN110486717A (en) | It is a kind of to mix the CFB boiler system for burning waste gas and waste liquid | |
| CN205842694U (en) | A kind of low NOx incinerator processing nitrogenous waste gas, waste liquid | |
| CN2804615Y (en) | Burner able to burn mixed live substance and coal powder and reburning denitration of the same | |
| CN105299627A (en) | Coal combustion process capable of reducing content of NOx in smoke | |
| CN105299629A (en) | Boiler combustion method capable of reducing content of NOx in smoke |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liang Jiefeng Inventor after: Yang Yun Inventor after: Li Jianhua Inventor before: Jiang Dong Inventor before: Huang Tian Inventor before: Liang Junzuo Inventor before: Liang Chenghan |
|
| COR | Change of bibliographic data | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160907 Address after: Starlake 530022 Nanning Road, the Guangxi Zhuang Autonomous Region No. 39 building 7 1 unit 3 floor No. 5 Applicant after: GUANGXI KUONENGBA ENERGY TECHNOLOGY DEVELOPMENT CO., LTD. Address before: Dong Ge road Nanning 530000 the Guangxi Zhuang Autonomous Region 24-8 building B unit B0606 real Kaifeng Applicant before: Guangxi Guisheng New Energy Science & Technology Co., Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160210 |