CN212132406U - Pulverized coal fired boiler capable of preventing convection heating surface from being contaminated and slagging - Google Patents
Pulverized coal fired boiler capable of preventing convection heating surface from being contaminated and slagging Download PDFInfo
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- CN212132406U CN212132406U CN202020626855.6U CN202020626855U CN212132406U CN 212132406 U CN212132406 U CN 212132406U CN 202020626855 U CN202020626855 U CN 202020626855U CN 212132406 U CN212132406 U CN 212132406U
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- stage absorption
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The utility model relates to a can prevent that convection heating surface from staiing pulverized coal boiler of slagging scorification, this boiler add the two-stage absorption tube in convection heating area, catch the alkali metal element in the flue gas, reduce staiing and the slagging scorification phenomenon of the normal heating surface of boiler, ensure the normal operating of boiler. The utility model comprises a screen superheater, a high temperature superheater and a high temperature reheater which are arranged in a hearth from inside to outside along the outlet of the hearth in the horizontal direction; the boiler wall surface between the platen superheater and the high-temperature superheater is provided with a first-stage absorption tube, the boiler wall surface between the high-temperature superheater and the high-temperature reheater is provided with a second-stage absorption tube, a plurality of first-stage absorption tube soot blowers are arranged in front of the first-stage absorption tube, and a plurality of second-stage absorption tube soot blowers are arranged in front of the second-stage absorption tube. The utility model discloses utilize the lower two-stage absorption tube of temperature to absorb the alkali metal element in the flue gas in advance to avoid alkali metal element to avoid solidifying at high temperature over heater and high temperature re-heater, it is effectual to prevent staiing the slagging scorification.
Description
Technical Field
The utility model belongs to the technical field of pulverized coal boiler burning, concretely relates to pulverized coal boiler that can prevent that convection heating surface from staiing the slagging scorification.
Background
In the process of burning the coal in the conventional boiler, the alkali metal elements in the coal are easy to solidify on the convection heating surface of the boiler, such as the surface of a high-temperature superheater and the surface of a high-temperature reheater, so as to form dirt and slag bonding substances which are difficult to blow off, when the thickness of the dirt and the slag bonding substances reaches a certain degree, the normal heat transfer capacity of the convection heating surface is seriously influenced, and the dirt and the slag bonding substances on adjacent tube rows are easy to adhere together, so that the normal operation of the boiler is seriously influenced.
At present, no better solution is provided for the problem that a convection heating surface is easy to stain and slag when coal with high alkali metal content is combusted, the conventional countermeasures are to strengthen soot blowing, add a slag and stain preventing additive taking kaolin as a main component and the like, and the methods have the defects of poor slag and stain preventing effect, high adding cost and influence on normal combustion of a boiler.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can prevent that convection heating surface from staiing the pulverized coal boiler of slagging scorification, this boiler adds the two-stage absorption tube in convection heating area, catches the alkali metal element in the flue gas to reduce staiing and the slagging scorification phenomenon of the normal heating surface of boiler, ensure the normal operating of boiler.
The utility model discloses a following technical scheme realizes:
a pulverized coal boiler capable of preventing a convection heating surface from being contaminated and slagging comprises a platen superheater, a high-temperature superheater and a high-temperature reheater which are arranged in a hearth from inside to outside along a hearth outlet in the horizontal direction; wherein, the first order absorption tube has been arranged on the boiler wall between platen superheater and the high temperature superheater, has arranged the second level absorption tube on the boiler wall between high temperature superheater and the high temperature reheater, and a plurality of first order absorption tube soot blowers have been arranged to first order absorption tube front, and a plurality of second level absorption tube soot blowers have been arranged to second level absorption tube front.
The utility model discloses a further improvement lies in, furnace's bottom is provided with the cold ash bucket.
The utility model discloses further improvement lies in, under the rated load, screen superheater export, first order absorption tube entrance smoke temperature are 1000 ~ 1150 ℃, and high temperature reheater export, second order absorption tube entrance smoke temperature are 900-.
The utility model discloses further improvement lies in, and the working medium temperature is 750 ~ 850 ℃ in the first order absorption tube, and the working medium temperature is 650 ~ 750 ℃ in the second order absorption tube.
The utility model discloses further improvement lies in, and first order absorption tube and second level absorption tube are arranged according to boiler space size and are arranged 1-3 rows, confirm the column number according to the boiler width, and the distance is greater than 500mm between every two absorption tubes.
The utility model discloses the further improvement lies in, and first order absorption tube soot blower and second level absorption tube soot blower adopt steam soot blower or water conservancy soot blower.
The utility model discloses at least, following profitable technological effect has:
1. the coal with higher alkali metal content can be combusted;
2. compared with the conventional pulverized coal fired boiler, only two stages of absorption pipes and a plurality of soot blowers are added, so that the equipment investment is increased slightly;
3. the lower two-stage absorption tube of temperature is utilized to absorb the alkali metal element in the flue gas in advance to avoid the alkali metal element to avoid solidifying at high temperature over heater and high temperature re-heater, prevent staiing slagging scorification effectual.
Drawings
Fig. 1 is a schematic structural diagram of the boiler of the present invention.
Fig. 2 is a schematic diagram of the first-stage absorption tube and the soot blower of the present invention.
Fig. 3 is a schematic diagram of a second stage absorption tube and a soot blower according to the present invention.
Description of reference numerals:
1-hearth; 2-ash cooling bucket; 3-platen superheater; 4-high temperature superheater; 5-high temperature reheater; 6-first stage absorber tube; 7-second stage absorber tube; 8-first stage absorption tube soot blower; 9-second stage absorption tube soot blower; 10-furnace outlet; 11-boiler wall.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1-3, the pulverized coal boiler provided by the present invention comprises a platen superheater 3, a high temperature superheater 4 and a high temperature reheater 5, which are horizontally arranged in a furnace 1 from inside to outside along a furnace outlet 10; wherein, a first-stage absorption tube 6 is arranged on a boiler wall surface 11 between the platen superheater 3 and the high-temperature superheater 4, a second-stage absorption tube 7 is arranged on the boiler wall surface 11 between the high-temperature superheater 4 and the high-temperature reheater 5, a plurality of first-stage absorption tube soot blowers 8 are arranged in front of the first-stage absorption tube 6, and a plurality of second-stage absorption tube soot blowers 9 are arranged in front of the second-stage absorption tube 7. The bottom of the hearth 1 is provided with a cold ash hopper 2.
Wherein, under rated load, the smoke temperature at the outlet of the screen superheater 3 and the inlet of the first-stage absorption tube 6 is 1000-1150 ℃, and the smoke temperature at the outlet of the high-temperature reheater 5 and the inlet of the second-stage absorption tube 7 is 900-1100 ℃.
The temperature of the working medium in the first-stage absorption pipe 6 is 750-850 ℃, and the temperature of the working medium in the second-stage absorption pipe 7 is 650-750 ℃.
The first-stage absorption tubes 6 and the second-stage absorption tubes 7 are arranged in 1-3 rows according to the space size of the boiler, the number of the rows is determined according to the width of the boiler, and the distance between every two rows of absorption tubes is more than 500 mm.
In addition, the first-stage and second-stage absorption tube sootblowers 8 and 9 employ steam sootblowers or hydraulic sootblowers. And the first-stage absorption tube soot blower 8 and the second-stage absorption tube soot blower 9 can ensure that the soot blowing range covers all absorption tubes, and simultaneously ensure that the wall surfaces of the first-stage absorption tube 6 and the second-stage absorption tube 7 can be blown off with pollutants and slag, and the soot blowing frequencies of the first-stage absorption tube soot blower 8 and the second-stage absorption tube soot blower 9 in front of the first-stage absorption tube 6 and the second-stage absorption tube 7 can be adjusted at any time according to requirements.
When the boiler operates, gaseous sodium, potassium and other elements in the flue gas are condensed into solid materials when contacting with the first-stage absorption tube 6 and the second-stage absorption tube 7 with lower temperature, and are captured by the tube walls of the first-stage absorption tube 6 and the second-stage absorption tube 7;
and a first-stage absorption tube soot blower 8 and a second-stage absorption tube soot blower 9 which are arranged in front of the first-stage absorption tube 6 and the second-stage absorption tube 7 periodically blow off pollutants and slag captured on the tube walls of the first-stage absorption tube 6 and the second-stage absorption tube 7.
Compared with the prior method for preventing the convection heating surface of the pulverized coal boiler from being contaminated and slagging, the utility model discloses do not need to increase too much device and equipment in the power plant, use cost is low, prevents slagging and stains effectually.
Claims (6)
1. A pulverized coal boiler capable of preventing a convection heating surface from being contaminated and slagging is characterized by comprising a platen superheater (3), a high-temperature superheater (4) and a high-temperature reheater (5) which are arranged in a hearth (1) from inside to outside along a hearth outlet (10) in the horizontal direction; wherein the content of the first and second substances,
a first-stage absorption tube (6) is arranged on a boiler wall surface (11) between the platen superheater (3) and the high-temperature superheater (4), a second-stage absorption tube (7) is arranged on the boiler wall surface (11) between the high-temperature superheater (4) and the high-temperature reheater (5), a plurality of first-stage absorption tube soot blowers (8) are arranged in front of the first-stage absorption tube (6), and a plurality of second-stage absorption tube soot blowers (9) are arranged in front of the second-stage absorption tube (7).
2. Pulverized coal fired boiler capable of preventing fouling and slagging of the convection heating surface according to claim 1 characterized in that the bottom of the furnace (1) is provided with a cold ash hopper (2).
3. The pulverized coal fired boiler capable of preventing the convection heating surface from being contaminated and slagging according to claim 1, characterized in that under rated load, the smoke temperature at the outlet of the platen superheater (3) and the inlet of the first-stage absorption tube (6) is 1000-1150 ℃, and the smoke temperature at the outlet of the high-temperature reheater (5) and the inlet of the second-stage absorption tube (7) is 900-1100 ℃.
4. The pulverized coal fired boiler capable of preventing the convection heating surface from being contaminated and slagging according to claim 1, characterized in that the temperature of the working medium in the first-stage absorption pipe (6) is 750-850 ℃, and the temperature of the working medium in the second-stage absorption pipe (7) is 650-750 ℃.
5. Pulverized coal fired boiler capable of preventing fouling and slagging of the convection heating surface according to claim 1 characterized in that the first stage absorption tubes (6) and the second stage absorption tubes (7) are arranged in 1-3 rows according to the boiler space size, the number of rows is determined according to the boiler width, and the distance between every two rows of absorption tubes is more than 500 mm.
6. Pulverized coal fired boiler for preventing fouling and slagging of the convection heating surface according to claim 1 characterized in that the first stage absorption tube soot blower (8) and the second stage absorption tube soot blower (9) are steam soot blower or hydraulic soot blower.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020626855.6U CN212132406U (en) | 2020-04-23 | 2020-04-23 | Pulverized coal fired boiler capable of preventing convection heating surface from being contaminated and slagging |
| JP2020005029U JP3230566U (en) | 2020-04-23 | 2020-11-20 | A pulverized coal boiler that can prevent dirt and slugging on the convection heating surface. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020626855.6U CN212132406U (en) | 2020-04-23 | 2020-04-23 | Pulverized coal fired boiler capable of preventing convection heating surface from being contaminated and slagging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212132406U true CN212132406U (en) | 2020-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020626855.6U Active CN212132406U (en) | 2020-04-23 | 2020-04-23 | Pulverized coal fired boiler capable of preventing convection heating surface from being contaminated and slagging |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3230566U (en) |
| CN (1) | CN212132406U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212783A1 (en) * | 2020-04-23 | 2021-10-28 | 西安热工研究院有限公司 | Pulverized coal boiler capable of preventing contamination and slagging of convection heating surface |
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2020
- 2020-04-23 CN CN202020626855.6U patent/CN212132406U/en active Active
- 2020-11-20 JP JP2020005029U patent/JP3230566U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212783A1 (en) * | 2020-04-23 | 2021-10-28 | 西安热工研究院有限公司 | Pulverized coal boiler capable of preventing contamination and slagging of convection heating surface |
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| Publication number | Publication date |
|---|---|
| JP3230566U (en) | 2021-02-04 |
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