CN210425077U - Wall temperature adjusting system for heating surface of coal-fired boiler - Google Patents
Wall temperature adjusting system for heating surface of coal-fired boiler Download PDFInfo
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- CN210425077U CN210425077U CN201920578089.8U CN201920578089U CN210425077U CN 210425077 U CN210425077 U CN 210425077U CN 201920578089 U CN201920578089 U CN 201920578089U CN 210425077 U CN210425077 U CN 210425077U
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Abstract
The utility model discloses a coal fired boiler heating surface wall temperature governing system belongs to the electric power production field. The heating surface wall temperature control mode of the coal-fired boiler of the power station mainly comprises two modes of combustion adjustment and temperature reduction water quantity increase, the task of reducing the temperature of the pipe wall is completed by integrally reducing the temperature of flue gas or steam, and the integral economy of the boiler is sacrificed. The system of the utility model mainly comprises a temperature-adjusting air flow main pipe, a general adjusting valve, an air flow distributor, a wall temperature adjusting valve, a cooling air flow branch pipe, a temperature-adjusting air flow branch pipe and a temperature adjuster. The temperature regulators are uniformly distributed along the width direction of the hearth and can be independently controlled, so that the function of locally regulating and cooling the temperature of high-temperature flue gas in the width direction of the hearth is realized, and the temperature of the flue gas flow field of other parts in the furnace and the temperature of steam in the pipe wall are not changed. The utility model discloses the system has the local fine setting control of heating surface wall temperature, prevents that local wall temperature from overtemperature, not influencing the advantage of the whole economic nature of boiler.
Description
Technical Field
The utility model relates to a coal fired boiler heating surface wall temperature governing system belongs to the electric power production field.
Background
At present, the coal-fired boiler of the power station gradually develops towards high parameter and large capacity. In order to prevent the leakage of the local pipe wall of the high-temperature heating surface during the operation of the power station boiler and cause safety production accidents, the wall temperature of the heating surface is strictly controlled not to exceed a limit value. The wall temperature control method is mainly used in two ways, one is that the temperature of the flue gas at the outlet of the hearth is reduced through the combustion adjustment in the hearth, so that the wall temperature of the high-temperature heating surface is reduced; the other method is to increase the amount of desuperheating water and reduce the wall temperature of the heated surface by reducing the temperature of the steam.
In actual operation, only a part of the pipe wall temperature exceeds a limit value and needs to be cooled, and most of the other pipe wall temperatures are normal and do not need to be cooled, for example, the chinese patent with the application number of 201410444015.7. However, no matter the combustion in the hearth is adjusted, or the amount of temperature-reducing water is increased, the task of reducing the temperature of the pipe wall is completed in a mode of reducing the temperature of the flue gas or the temperature of the steam as a whole. Therefore, the two modes substantially sacrifice the overall economy of the boiler and achieve the aim of local safety.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the not enough of current wall temperature regulation mode, provide a coal fired boiler receives hot side wall temperature governing system.
The utility model provides a technical scheme that above-mentioned problem adopted is: a wall temperature adjusting system for a heating surface of a coal-fired boiler comprises a boiler, a screen superheater, a high-temperature reheater, an SCR device, an air preheater, an electrostatic precipitator, an induced draft fan, a desulfurizing tower and a chimney, wherein the boiler, the SCR device, the air preheater, the electrostatic precipitator, the induced draft fan, the desulfurizing tower and the chimney are sequentially communicated, and the screen superheater, the high-temperature superheater and the high-temperature reheater are arranged at the top of a hearth of the boiler; the system is characterized by also comprising a temperature-regulating air flow main pipe, a main regulating valve, an air flow distributor, a wall temperature regulating valve, a cooling air flow branch pipe, a temperature-regulating air flow branch pipe and a temperature regulator; one end of the temperature-adjusting air flow main pipe is communicated to a flue between the induced draft fan and the desulfurizing tower, the other end of the temperature-adjusting air flow main pipe is communicated with the air flow distributor, and the main adjusting valve is installed on the temperature-adjusting air flow main pipe; the air flow distributor is also communicated with a plurality of temperature-adjusting air flow branch pipes which are connected in parallel, the temperature-adjusting air flow branch pipes are communicated with the temperature adjuster, and the temperature-adjusting air flow branch pipes are provided with wall temperature adjusting valves; a cooling air flow branch pipe is led out from each temperature-adjusting air flow branch pipe between the wall temperature adjusting valve and the air flow distributor, and the cooling air flow branch pipes are also communicated with the temperature adjuster; the temperature regulator is arranged at the top of a hearth of the boiler and is communicated with the boiler, and the temperature regulator is positioned between the platen superheater and the high-temperature superheater. The attemperators are connected in parallel in the width direction of the boiler furnace and are uniformly distributed. The thermostat is inserted through the roof of the boiler and partially.
Furthermore, the thermostat comprises an outer sleeve, an inner sleeve and a sealing end face, wherein the inner sleeve is arranged in the outer sleeve, the inner sleeve and the outer sleeve are coaxially arranged, and the outer sleeve and the inner sleeve are combined to form two spaces which are not communicated with each other. The lower end of the temperature regulator is of an open structure, and the upper end of the temperature regulator is sealed by a circular sealing end face.
Furthermore, a temperature-adjusting airflow inlet is formed in the sealing end face, and the temperature-adjusting airflow branch pipe is communicated to the inner sleeve through the temperature-adjusting airflow inlet; the outer sleeve is provided with a cooling airflow inlet, and the cooling airflow branch pipe is communicated to the outer sleeve through the cooling airflow inlet.
The working method comprises the following steps: high-temperature flue gas generated by boiler combustion enters an SCR device for denitration after respectively passing through heating surfaces such as a screen superheater, a high-temperature superheater and a high-temperature reheater in a boiler, then is cooled by an air preheater, dedusted by an electrostatic precipitator and pressure head improved by an induced draft fan, the flue gas is divided into two parts, wherein one part of the flue gas enters a chimney after passing through a desulfurizing tower, and the other part of the flue gas is used for adjusting the wall temperature of a local heating surface and enters an air flow distributor through a temperature-adjusting air flow header pipe. The flow of the temperature-adjusting flue gas is controlled by a main adjusting valve.
The gas flow distributor divides the flue gas into a plurality of parallel flue gas flows, each flue gas flow is divided into two parts after flowing out from the gas flow distributor, one part of the flue gas flows is sent into the inner sleeve pipe through the temperature-adjusting gas flow branch pipe and the temperature-adjusting gas flow inlet, and is finally mixed with the high-temperature flue gas in the boiler hearth; and the other part of flue gas flow is sent into the outer sleeve through the cooling gas flow branch pipe and the cooling gas flow inlet and finally mixed with high-temperature flue gas in the boiler hearth, and the part of flue gas flow has the function of cooling the temperature regulator to prevent the outer sleeve and the inner sleeve from being overheated, deformed and damaged in a high-temperature environment.
Because the temperature regulators are uniformly distributed along the width direction of the hearth, and the wall temperature regulating valve corresponding to each temperature regulator is independently controlled, the function of locally regulating and cooling the temperature of high-temperature flue gas in the width direction of the boiler hearth is realized, the flue gas flow field of other parts in the boiler and the steam temperature in the pipe wall cannot be integrally influenced, the economy of the boiler cannot be integrally influenced, and the safety requirement of a local high-temperature heating surface is met.
Compared with the prior art, the utility model, have following advantage and effect: the utility model discloses the system has the local fine setting control of heating surface wall temperature, prevents that local wall temperature from overtemperature, not influencing the advantage of the whole economic nature of boiler.
Drawings
Fig. 1 is a system flow diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a thermostat according to an embodiment of the present invention.
Fig. 3 is a schematic view of the structure in the direction of the plane a-a in fig. 1.
Numbering in the figures: the device comprises a boiler 1, a platen superheater 2, a temperature regulator 3, a temperature regulating air flow branch pipe 4, a cooling air flow branch pipe 5, a high-temperature superheater 6, a high-temperature reheater 7, a wall temperature regulating valve 8, an air flow distributor 9, an SCR device 10, a main regulating valve 11, a temperature regulating air flow main pipe 12, a chimney 13, a desulfurizing tower 14, an induced draft fan 15, an electrostatic dust collector 16, an air preheater 17, an outer sleeve 18, a cooling air flow inlet 19, a sealing end face 20, a temperature regulating air flow inlet 21 and an inner sleeve 22.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1 to 3, the system for regulating the wall temperature of the heating surface of the coal-fired boiler in the embodiment mainly comprises a main temperature-regulating gas flow pipe 12, a main regulating valve 11, a gas flow distributor 9, a wall temperature regulating valve 8, a cooling gas flow branch pipe 5, a temperature-regulating gas flow branch pipe 4 and a temperature regulator 3.
The boiler 1, the SCR device 10, the air preheater 17, the electrostatic precipitator 16, the induced draft fan 15, the desulfurizing tower 14 and the chimney 13 are communicated in sequence, and the platen superheater 2, the high-temperature superheater 6 and the high-temperature reheater 7 are arranged at the top of the hearth of the boiler 1.
One end of a temperature-adjusting air flow main pipe 12 is communicated with a flue between an induced draft fan 15 and a desulfurizing tower 14, the other end of the temperature-adjusting air flow main pipe 12 is communicated with an air flow distributor 9, and a main adjusting valve 11 is installed on the temperature-adjusting air flow main pipe 12; the air flow distributor 9 is also communicated with a plurality of temperature-adjusting air flow branch pipes 4 which are connected in parallel, the temperature-adjusting air flow branch pipes 4 are communicated with the temperature adjuster 3, and the temperature-adjusting air flow branch pipes 4 are provided with wall temperature adjusting valves 8; a cooling air flow branch pipe 5 is led out from each temperature-adjusting air flow branch pipe 4 between the wall temperature adjusting valve 8 and the air flow distributor 9, and the cooling air flow branch pipes 5 are also communicated with the temperature adjuster 3; the attemperator 3 is arranged on the top of the furnace of the boiler 1, the attemperator 3 is communicated with the boiler 1, and the attemperator 3 is positioned between the platen superheater 2 and the high-temperature superheater 6. The temperature regulators 3 are connected in parallel with each other in the width direction of the furnace of the boiler 1 and are uniformly distributed. The thermostat 3 is inserted through the roof of the boiler 1 and partly.
The thermostat 3 comprises an outer sleeve 18, an inner sleeve 22 and a sealing end face 20, wherein the inner sleeve 22 is arranged in the outer sleeve 18, the inner sleeve 22 and the outer sleeve 18 are coaxially arranged, and the outer sleeve 18 and the inner sleeve 22 are combined inside and outside to form two spaces which are not communicated with each other. The lower end of the thermostat 3 is an open structure, and the upper end of the thermostat 3 is sealed by a circular sealing end face 20.
The sealed end face 20 is provided with a temperature-adjusting airflow inlet 21, and the temperature-adjusting airflow branch pipe 4 is communicated to the inner sleeve 22 through the temperature-adjusting airflow inlet 21; the outer sleeve 18 is provided with a cooling air inlet 19, and the cooling air branch pipe 5 is communicated with the outer sleeve 18 through the cooling air inlet 19.
The working method comprises the following steps: high-temperature flue gas generated by combustion of the boiler 1 enters the SCR device 10 for denitration after passing through heating surfaces such as a screen superheater 2, a high-temperature superheater 6 and a high-temperature reheater 7 in the boiler 1 respectively, then is cooled by an air preheater 17, dedusted by an electrostatic precipitator 16 and pressure head increased by an induced draft fan 15 respectively, the flue gas is divided into two parts, wherein most of the flue gas enters a chimney 13 after passing through a desulfurizing tower 14, and the other small part of the flue gas is used for adjusting the wall temperature of a local heating surface and enters an air flow distributor 9 through a temperature-adjusting air flow main pipe 12. The flow of the temperature-regulated flue gas is controlled by a main regulating valve 11.
The gas flow distributor 9 divides the flue gas into a plurality of parallel flue gas flows, each flue gas flow is divided into two parts after flowing out of the gas flow distributor 9, one part of the flue gas flows is sent into the inner sleeve 22 through the temperature-adjusting gas flow branch pipe 4 and the temperature-adjusting gas flow inlet 21, and finally is mixed with the high-temperature flue gas in the hearth of the boiler 1; another part of the flue gas flow is fed into the outer sleeve 18 through the cooling gas flow branch pipe 5 and the cooling gas flow inlet 19 and finally mixed with the high-temperature flue gas inside the hearth of the boiler 1, and the function of the part of the flue gas flow is to cool the temperature regulator 3 and prevent the outer sleeve 18 and the inner sleeve 22 from being damaged due to overheating deformation in a high-temperature environment.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as being included in the following claims.
Claims (3)
1. A wall temperature adjusting system for a heating surface of a coal-fired boiler comprises a boiler (1), a screen superheater (2), a high-temperature superheater (6), a high-temperature reheater (7), an SCR device (10), an air preheater (17), an electrostatic dust collector (16), an induced draft fan (15), a desulfurizing tower (14) and a chimney (13), wherein the boiler (1), the SCR device (10), the air preheater (17), the electrostatic dust collector (16), the induced draft fan (15), the desulfurizing tower (14) and the chimney (13) are sequentially communicated, and the screen superheater (2), the high-temperature superheater (6) and the high-temperature reheater (7) are arranged at the top of a hearth of the boiler (1); the system is characterized by also comprising a temperature-regulating air flow main pipe (12), a main regulating valve (11), an air flow distributor (9), a wall temperature regulating valve (8), a cooling air flow branch pipe (5), a temperature-regulating air flow branch pipe (4) and a temperature regulator (3); one end of the temperature-adjusting air flow main pipe (12) is communicated to a flue between the induced draft fan (15) and the desulfurizing tower (14), the other end of the temperature-adjusting air flow main pipe (12) is communicated with the air flow distributor (9), and the main adjusting valve (11) is installed on the temperature-adjusting air flow main pipe (12); the air flow distributor (9) is also communicated with a plurality of temperature-adjusting air flow branch pipes (4) which are connected in parallel, the temperature-adjusting air flow branch pipes (4) are communicated with the temperature adjuster (3), and the temperature-adjusting air flow branch pipes (4) are provided with wall temperature adjusting valves (8); a cooling air flow branch pipe (5) is led out from each temperature-adjusting air flow branch pipe (4) between the wall temperature adjusting valve (8) and the air flow distributor (9), and the cooling air flow branch pipes (5) are also communicated with the temperature adjuster (3); the temperature regulator (3) is arranged at the top of a hearth of the boiler (1), the temperature regulator (3) is communicated with the boiler (1), and the temperature regulator (3) is positioned between the platen superheater (2) and the high-temperature superheater (6).
2. The system for regulating the wall temperature of the heating surface of the coal-fired boiler according to claim 1, characterized in that the temperature regulator (3) comprises an outer sleeve (18), an inner sleeve (22) and a sealing end surface (20), the inner sleeve (22) is arranged in the outer sleeve (18), the inner sleeve (22) and the outer sleeve (18) are coaxially arranged, the lower end of the temperature regulator (3) is of an open structure, and the upper end of the temperature regulator (3) is sealed by the circular sealing end surface (20).
3. The system for adjusting the wall temperature of the heating surface of the coal-fired boiler according to claim 2, wherein the sealing end surface (20) is provided with a temperature-adjusting gas flow inlet (21), and the temperature-adjusting gas flow branch pipe (4) is communicated to the inner sleeve (22) through the temperature-adjusting gas flow inlet (21); the outer sleeve (18) is provided with a cooling airflow inlet (19), and the cooling airflow branch pipe (5) is communicated to the outer sleeve (18) through the cooling airflow inlet (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920578089.8U CN210425077U (en) | 2019-04-25 | 2019-04-25 | Wall temperature adjusting system for heating surface of coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920578089.8U CN210425077U (en) | 2019-04-25 | 2019-04-25 | Wall temperature adjusting system for heating surface of coal-fired boiler |
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| Publication Number | Publication Date |
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| CN210425077U true CN210425077U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920578089.8U Active CN210425077U (en) | 2019-04-25 | 2019-04-25 | Wall temperature adjusting system for heating surface of coal-fired boiler |
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| CN (1) | CN210425077U (en) |
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