CN213542491U - Screen type evaporator system of waste incineration waste heat boiler - Google Patents
Screen type evaporator system of waste incineration waste heat boiler Download PDFInfo
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- CN213542491U CN213542491U CN202021945700.5U CN202021945700U CN213542491U CN 213542491 U CN213542491 U CN 213542491U CN 202021945700 U CN202021945700 U CN 202021945700U CN 213542491 U CN213542491 U CN 213542491U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Abstract
The utility model relates to an urban domestic waste burns the electricity generation field, specifically is a waste incineration exhaust-heat boiler screen formula evaporimeter system, and this system includes: the system comprises a ceiling water-cooled wall lower header, an evaporator upper header connecting pipe, an evaporator upper header, a screen type evaporator pipe, an evaporator lower header, an evaporator lower connecting pipe, a front partition wall lower header and a supporting steel plate. The utility model adds the vertically arranged screen type evaporator system in the second flue of the waste incineration exhaust-heat boiler, when the heat value of the waste is too high, the rated waste treatment capacity of the incinerator is recovered by absorbing heat through the screen type evaporator system, and the normal capacity of the incinerator is controlled and ensured; the excessive high temperature of the flue gas at the inlet of the high-temperature superheater can be effectively prevented, and the problems of high-temperature corrosion and dust deposition of the high-temperature superheater are avoided; through addding the screen formula water-cooling wall of vertical arrangement, steam-water mixture passes in and out perpendicularly, and is the same with wall formula water-cooling wall structural characteristic, compares the flag evaporator that transversely erodees, more is favorable to water circulation, ensures boiler safety and stability operation.
Description
Technical Field
The utility model belongs to the technical field of municipal solid waste burns and specifically relates to a arrange perpendicularly at exhaust-heat boiler second flue, can effectively reduce screen evaporator system of over heater entry smoke temperature.
Background
In recent years, the incineration disposal capacity of domestic garbage in China is greatly improved, and the garbage incineration technology is widely used at home and abroad.
Meanwhile, domestic and foreign waste incineration flue gas emission standards are becoming stricter, local emission standards are gradually established in various places, and the emission requirements of nitrogen oxides are increasing.
Along with the gradual improvement of the living standard of people, the heat value of household garbage is higher and higher, the challenge to the household garbage incineration waste heat boiler which is operated at present is great, and on the premise of meeting the red line operation of rated load, the garbage treatment capacity of an incineration plant is ensured to become an operation key index, so that the garbage overburning phenomenon is caused.
The continuous operation of the super-thermal load caused by the increase of the calorific value of the waste will cause the following serious problems: 1. the flue gas temperature of the waste heat boiler is too high and deviates from an initial design value; 2. the boiler tube bundle has serious ash deposition and poor heat exchange effect; 3. the superheater has serious high-temperature corrosion and increased tube explosion frequency.
Aiming at the problems, in the technical improvement of the prior project, a transverse flag type evaporator is usually additionally arranged on two flues, and the evaporator is not beneficial to water circulation and is easier to accumulate dust; in a high-temperature radiation area of the two flues, the flag-type evaporation heating surface is more likely to reach a state of heat transfer deterioration than a wall-type heating surface, particularly, a heating surface pipe which is horizontally arranged is more severe, the vapor content in a vapor-water mixture is higher, the phenomenon of pipe explosion is easily caused, and the operation safety of the boiler is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of excess boiler over-temperature, tube bundle dust accumulation, corrosion of heating surface and tube explosion caused by the increase of the heat value of the garbage and the heat load of the boiler volume.
In order to solve the technical problem, the utility model provides a 1 waste incineration exhaust-heat boiler screen formula evaporimeter system, a serial communication port, include: a ceiling water wall lower header (2), an evaporator upper connecting pipe (3), an evaporator upper header (4), a screen type evaporator pipe (5), an evaporator lower header (6), an evaporator lower connecting pipe (7), a front partition wall lower header (8) and a supporting steel plate (9); supporting steel plates (9) are respectively arranged on fin steel plates of a front partition wall water-cooled wall (10) and a rear partition wall water-cooled wall (11) of a waste heat boiler secondary flue from top to bottom, a screen type evaporator tube (5) is provided with an evaporator upper header (4) and an evaporator lower header (6), the evaporator upper header (4) and the evaporator lower header (6) are respectively fixed on the supporting steel plates (9) without welding, the evaporator upper header (4) is provided with an evaporator upper portion connecting pipe (3) and is connected with a ceiling water-cooled wall lower header (2), and the evaporator lower header (6) is provided with an evaporator lower portion connecting pipe (7) and is connected with a front partition wall lower portion header (8).
When the waste heat boiler operates normally, high-temperature flue gas from the first flue enters the second flue, and then exchanges heat with an evaporator vertically arranged in the second flue through radiation and convection. Boiler water from the steam drum enters a header at the lower part of the front partition wall through a downcomer and then enters an evaporator through a connecting pipe at the lower part of the evaporator to exchange heat with high-temperature flue gas, the density of the boiler water in the evaporator is reduced after the boiler water exchanges heat with the high-temperature flue gas, and a gravity pressure difference is formed between the boiler water and the boiler water in the downcomer; under the action of gravity pressure difference, steam water in the evaporator vertically flows upwards, passes through the evaporation upper header, the upper connecting pipe and the ceiling water-cooled wall, and finally flows into the boiler steam drum to complete steam-water circulation.
Furthermore, the upper header and the lower header of the evaporator are supported on the steel plates of the two flue fins without welding, the steel plates are welded with the fins of the water cooling walls of the two flues, the evaporator can be effectively fixed, and the steel plates can be made of 316L and can effectively prevent the evaporator from being corroded by the combined flue gas;
furthermore, the screen evaporator is vertically arranged in a second flue of the boiler, and the temperature of the flue gas at the inlet of the high-temperature superheater of the third flue can be effectively reduced to below 600 ℃ through convection and radiation heat exchange with the flue gas, so that the high-temperature corrosion phenomenon of the superheater is prevented;
furthermore, the screen type evaporator is vertically arranged in a second flue of the boiler, so that the evaporator is not easy to deposit ash in the operation of the boiler, and is more favorable for water circulation compared with other evaporators, such as flag type evaporators, and the phenomena of heat transfer deterioration, tube explosion and the like caused by high vapor content in heat exchange can be avoided;
furthermore, the quantity of the evaporators and the quantity of the connecting pipes can be reasonably adjusted according to the heat load of the waste heat boilers with different scales of garbage disposal capacities and the width condition of the two flues.
Furthermore, connecting pipes on the upper part and the lower part of the evaporator, upper and lower headers are welded with reinforcing meshes and SiC pouring materials are laid, so that the pipes are isolated from being in direct contact with flue gas, the pouring materials can be effectively fixed, and the phenomenon that the pouring materials fall off due to high-temperature flue gas scouring is prevented.
The technical scheme provided by the utility model, can reach following effect: when the heat value of the garbage is too high, the screen evaporator system absorbs heat to recover the rated garbage processing capacity of the incinerator, and normal capacity of the incinerator is controlled and guaranteed.
Secondly, the vertical evaporator is arranged, so that the overhigh temperature of the flue gas at the inlet of the high-temperature superheater is prevented, and the problems of high-temperature corrosion and dust deposition of the high-temperature superheater are avoided;
finally, the vertical evaporator is arranged in the two flues, so that water circulation is facilitated, and dust is not easy to accumulate; compared with a flag-type evaporation heating surface, the heat transfer deterioration state can not occur, the vapor content in the vapor-water mixture is moderate, the tube explosion is not easy to cause, and the stable operation of the boiler installation is ensured.
Drawings
FIG. 1 is a schematic diagram of a system of an evaporator
FIG. 2 is a flow diagram of a screen evaporator system.
FIG. 3 is a front view of a plastic laying device for a screen evaporator.
FIG. 4 is a schematic structural diagram of castable for a screen type evaporator header.
FIG. 5 is a schematic structural diagram of castable for connecting tubes of a screen-type evaporator.
In the figure: 1-ceiling water-cooled wall, 2-ceiling water-cooled wall lower header, 3-evaporator upper connecting pipe, 4-evaporator upper header, 5-screen evaporator pipe, 6-evaporator lower header, 7-evaporator lower connecting pipe, 8-front partition wall lower header, 9-supporting steel plate, 10-front partition wall water-cooled wall, 11-rear partition wall water-cooled wall, and 12-ceiling water-cooled wall upper header; 13-steam drum, 14-down pipe; 15-pin, 16-steel bar and 17-SiC casting material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is given to the present invention in a clear and complete manner by referring to the drawings and examples of the present invention;
the utility model provides a waste incineration exhaust-heat boiler screen formula evaporimeter system, include: the system comprises a ceiling water-cooled wall lower header (2), an evaporator upper part connecting pipe (3), an evaporator upper header (4), a screen type evaporator pipe (5), an evaporator lower header (6), an evaporator lower part connecting pipe (7), a front partition wall lower part header (8) and a supporting steel plate (9).
As shown in fig. 1: supporting steel plates (9) are respectively arranged on fin steel plates of a front partition wall water cooling wall (10) and a rear partition wall water cooling wall (11) of a secondary flue of the waste heat boiler from top to bottom, a screen type evaporator tube (5) is provided with an evaporator upper header (4) and an evaporator lower header (6), the evaporator upper header (4) and the evaporator lower header (6) are respectively fixed on the supporting steel plates (9) without welding, the evaporator upper header (4) is provided with an evaporator upper portion connecting pipe (3) and is connected with a ceiling water cooling wall lower header (2), and the evaporator lower header (6) is provided with an evaporator lower portion connecting pipe (7) and is connected with a front partition wall lower portion header (8).
As shown in fig. 3, 4 and 5, in order to prevent the high temperature corrosion phenomenon, pins (15) are welded on the evaporator upper header (4) and the evaporator lower header (6) first, and then reinforcing steel bars (16) are welded to form a reinforcing mesh; and the evaporator upper connecting pipe (3) and the evaporator lower connecting pipe (7) are welded with steel bars (16) with certain thickness, and SiC pouring materials (17) are completely laid on the steel bars.
The utility model discloses the system the theory of operation as follows: as shown in fig. 2, when the waste heat boiler operates normally, high-temperature flue gas from the first flue enters the second flue, and exchanges heat with a screen evaporator tube (5) vertically arranged in the second flue through radiation and convection. Boiler water from a boiler drum (13) enters a front partition wall lower part header (8) through a down pipe (14), then enters a screen type evaporator pipe (5) through an evaporator lower part connecting pipe (7) in a distributed mode, the boiler water in the screen type evaporator pipe (5) exchanges heat with high-temperature flue gas, heat absorption and vaporization are carried out to form a steam-water mixture, the density is reduced, a gravity level pressure difference is formed between the boiler water and the down pipe (14), under the action of the gravity level pressure difference, steam-water in the screen type evaporator pipe (5) vertically flows upwards, and finally flows into the boiler drum (13) of the boiler to finish a steam-water cycle through an evaporator upper header (4), an evaporator upper part connecting pipe (3) and a ceiling water wall (1).
The utility model discloses a concrete example: the treatment capacity of the garbage is 750t/d, the design calorific value of the initial garbage is 1600 kcal/kg, the evaporation capacity of a boiler is 65.8t/h, the inlet flue gas temperature of a high-temperature superheater is 590 ℃, and the exhaust gas temperature is 190 ℃; along with the continuous increase of the heat value of the garbage, the heat value of the garbage is increased to 1900kcal/kg, under the condition of ensuring the stable operation of the garbage treatment capacity of 750t/d, the volume heat load of a boiler is increased, the temperature of the flue gas at the inlet of a high-temperature superheater is increased to 650 ℃, the deposition of ash on the superheater is serious, the high-temperature corrosion is serious, the frequency of pipe explosion is increased, and the temperature of the flue gas is increased to. By additionally arranging three vertically arranged water cooling screens in parallel in the two flues, the effective heat exchange area is 213m2The temperature of the flue gas at the inlet of the high-temperature superheater can be reduced to 580 ℃, the evaporation capacity of the boiler can be increased to 78.0t/h, and the temperature of the flue gas can be reduced to190 ℃, and can ensure that the evaporation capacity of the two flues has no phenomena of dust deposition and high-temperature corrosion.
Claims (3)
1. The utility model provides a msw incineration exhaust-heat boiler screen formula evaporimeter system which characterized in that includes: a ceiling water wall lower header (2), an evaporator upper connecting pipe (3), an evaporator upper header (4), a screen type evaporator pipe (5), an evaporator lower header (6), an evaporator lower connecting pipe (7), a front partition wall lower header (8) and a supporting steel plate (9); supporting steel plates (9) are respectively arranged on fin steel plates of a front partition wall water-cooled wall (10) and a rear partition wall water-cooled wall (11) of a waste heat boiler secondary flue from top to bottom, a screen type evaporator tube (5) is provided with an evaporator upper header (4) and an evaporator lower header (6), the evaporator upper header (4) and the evaporator lower header (6) are respectively fixed on the supporting steel plates (9) without welding, the evaporator upper header (4) is provided with an evaporator upper portion connecting pipe (3) and is connected with a ceiling water-cooled wall lower header (2), and the evaporator lower header (6) is provided with an evaporator lower portion connecting pipe (7) and is connected with a front partition wall lower portion header (8).
2. A screen evaporator system of a waste incineration waste heat boiler according to claim 1, characterized in that pins (15) and reinforcing bars (16) are welded to the evaporator upper header (4) and the evaporator lower header (6) to form a reinforcing mesh.
3. Waste incineration waste heat boiler screen evaporator system according to claim 1, characterised in that the evaporator upper connection pipe (3) and the evaporator lower connection pipe (7) are welded with steel reinforcement (16) and are laid with SiC casting (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021945700.5U CN213542491U (en) | 2020-09-08 | 2020-09-08 | Screen type evaporator system of waste incineration waste heat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021945700.5U CN213542491U (en) | 2020-09-08 | 2020-09-08 | Screen type evaporator system of waste incineration waste heat boiler |
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| Publication Number | Publication Date |
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| CN213542491U true CN213542491U (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021945700.5U Active CN213542491U (en) | 2020-09-08 | 2020-09-08 | Screen type evaporator system of waste incineration waste heat boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060794A (en) * | 2021-11-27 | 2022-02-18 | 无锡华光环保能源集团股份有限公司 | Evaporator structure of waste incineration boiler |
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2020
- 2020-09-08 CN CN202021945700.5U patent/CN213542491U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060794A (en) * | 2021-11-27 | 2022-02-18 | 无锡华光环保能源集团股份有限公司 | Evaporator structure of waste incineration boiler |
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