CN114183748A - Low-sulfur low-nitrogen circulating fluidized bed boiler with double ultralow emissions - Google Patents
Low-sulfur low-nitrogen circulating fluidized bed boiler with double ultralow emissions Download PDFInfo
- Publication number
- CN114183748A CN114183748A CN202111497203.2A CN202111497203A CN114183748A CN 114183748 A CN114183748 A CN 114183748A CN 202111497203 A CN202111497203 A CN 202111497203A CN 114183748 A CN114183748 A CN 114183748A
- Authority
- CN
- China
- Prior art keywords
- low
- hearth
- boiler
- fluidized bed
- temperature
- 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.)
- Withdrawn
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 239000011593 sulfur Substances 0.000 title claims abstract description 13
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 12
- 235000019738 Limestone Nutrition 0.000 claims abstract description 16
- 239000006028 limestone Substances 0.000 claims abstract description 16
- 239000003245 coal Substances 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 239000003546 flue gas Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 235000010261 calcium sulphite Nutrition 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention relates to the technical field of circulating fluidized bed boilers, in particular to a low-sulfur and low-nitrogen double-ultralow-emission circulating fluidized bed boiler which meets the requirements of low-sulfur and low-nitrogen emission and simultaneously reduces investment cost and operation cost, and is characterized in that the combustion temperature of a boiler hearth is 850-920 ℃, the circulation multiplying factor is 23-27, the three-point temperature difference of the bed temperature of the hearth, the outlet temperature of the hearth and the return temperature of the hearth is 0-15 ℃, the oxygen content in the hearth is 2-3%, limestone access ports are added on a coal supply pipe of the boiler and a dense-phase region of the hearth, and limestone is added when the boiler operates.
Description
Technical Field
The invention relates to the technical field of circulating fluidized bed boilers, in particular to a low-sulfur and low-nitrogen double-ultralow-emission circulating fluidized bed boiler.
Background
Under the background that the pollutant discharge standard is stricter, the circulating fluidized bed boiler is used as an environment-friendly coal-fired boiler, the low pollutant discharge potential of the circulating fluidized bed combustion technology is deeply dug, the market competitiveness of the circulating fluidized bed boiler is further improved, and the circulating fluidized bed boiler has important significance for clean and efficient utilization of coal and energy transformation and upgrading. A traditional circulating fluidized bed boiler needs to be additionally provided with desulfurization and denitration facilities after being put into operation. Not only the investment cost and the operation cost of the power plant are increased, but also the environment-friendly energy consumption is caused.
Disclosure of Invention
In order to solve the problem of high cost caused by additionally adding desulfurization and denitrification equipment to meet the requirements of low-sulfur and low-nitrogen emission in the prior art, the invention provides a low-sulfur and low-nitrogen double-ultralow-emission circulating fluidized bed boiler which meets the requirements of low-sulfur and low-nitrogen emission and simultaneously reduces the investment cost and the operation cost.
The technical scheme is as follows: a low-sulfur low-nitrogen double-ultralow-emission circulating fluidized bed boiler is characterized in that the combustion temperature of a boiler hearth is 850-920 ℃, the circulating multiplying power is 23-27, the three-point temperature difference of the bed temperature of the hearth, the outlet temperature of the hearth and the return temperature of the hearth is 0-15 ℃, the oxygen content in the hearth is 2-3%, limestone access ports are added on a coal feeding pipe of the boiler and a dense-phase region of the hearth, and limestone is added during the operation of the boiler.
After the method is adopted, the original NOx emission is controlled below 50mg/Nm by controlling parameters such as combustion temperature, oxygen content, circulation multiplying power and the like of the hearth, and limestone and CaCO in limestone are added during the operation of the boiler3High-temperature decomposition into CaO, CaO and SO in flue gas2And CaSO3 is generated through reaction, SO that SO2 in the flue gas is removed, the SO2 in the flue gas at the outlet of the boiler is discharged less than 30mg/Nm, and both nitrogen and sulfur reach the national ultra-low emission standard.
Detailed Description
A low-sulfur low-nitrogen double-ultralow-emission circulating fluidized bed boiler is characterized in that the combustion temperature of a boiler furnace is 850-920 ℃, the circulation ratio is about 25, the three-point temperature difference of the bed temperature of the furnace, the outlet temperature of the furnace and the return temperature of the furnace is 0-15 ℃, the oxygen content in the furnace is 2-3%, limestone access ports are added on a coal supply pipe of the boiler and a dense-phase region of the furnace, limestone is added during the operation of the boiler, and if the limestone is at the coal supply pipe, the limestone and coal are directly mixed and fed into the furnace, and if the limestone is at the dense-phase region of the furnace, the limestone and coal are fed once along with secondary air and are arranged at the height of the secondary air.
According to the invention, the combustion temperature, the circulation rate and the temperature difference of the three parts of the hearth are reasonably controlled, and a reasonable range is selected by matching with the oxygen content, so that the original emission of NOx after the coal is combusted is controlled below 50mg/Nm cultivation; and in the potBy spraying limestone or CaCO in limestone during operation of the furnace3The CaO is decomposed at high temperature, and the CaO reacts with SO2 in the flue gas to generate CaSO3, SO that SO2 in the flue gas is removed. Through the measures, the circulating fluidized bed boiler realizes the steps of carrying out NO 2 emission < 30mg/Nm and carrying out original NOx emission < 50mg/Nm cultivation in the boiler outlet flue gas, and achieves the national ultra-low emission standard.
Not only greatly reduces the investment cost and the operation cost of the power plant, but also can reduce the consumption of environment-friendly energy. However, the ash residue after desulfurization in the furnace has high sulfur content, and the comprehensive utilization problem of the ash residue can be influenced.
Claims (1)
1. A low-sulfur low-nitrogen double-ultralow-emission circulating fluidized bed boiler is characterized in that the combustion temperature of a boiler hearth is 850-920 ℃, the circulating multiplying power is 23-27, the three-point temperature difference of the bed temperature of the hearth, the outlet temperature of the hearth and the return temperature of the hearth is 0-15 ℃, the oxygen content in the hearth is 2-3%, limestone access ports are added on a coal feeding pipe of the boiler and a dense-phase region of the hearth, and limestone is added during the operation of the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111497203.2A CN114183748A (en) | 2021-12-09 | 2021-12-09 | Low-sulfur low-nitrogen circulating fluidized bed boiler with double ultralow emissions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111497203.2A CN114183748A (en) | 2021-12-09 | 2021-12-09 | Low-sulfur low-nitrogen circulating fluidized bed boiler with double ultralow emissions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114183748A true CN114183748A (en) | 2022-03-15 |
Family
ID=80542846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111497203.2A Withdrawn CN114183748A (en) | 2021-12-09 | 2021-12-09 | Low-sulfur low-nitrogen circulating fluidized bed boiler with double ultralow emissions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114183748A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757648A (en) * | 2021-09-16 | 2021-12-07 | 无锡华光环保能源集团股份有限公司 | System and process for deep desulfurization by spraying calcium into circulating fluidized bed boiler |
-
2021
- 2021-12-09 CN CN202111497203.2A patent/CN114183748A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757648A (en) * | 2021-09-16 | 2021-12-07 | 无锡华光环保能源集团股份有限公司 | System and process for deep desulfurization by spraying calcium into circulating fluidized bed boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220315 |