CN215765034U - Heating steam drainage system - Google Patents
Heating steam drainage system Download PDFInfo
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- CN215765034U CN215765034U CN202122039637.XU CN202122039637U CN215765034U CN 215765034 U CN215765034 U CN 215765034U CN 202122039637 U CN202122039637 U CN 202122039637U CN 215765034 U CN215765034 U CN 215765034U
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Abstract
The utility model relates to a heating steam drainage system, wherein a primary air pre-heater of a drainage part of an air pre-heater is provided with four sections, a cold air inlet of the primary air pre-heater is provided with a supercooling section heating surface, low-pressure section drainage and high-pressure section drainage of the primary air pre-heater are connected to the supercooling section heating surface for heat exchange, and the high-pressure supercooling section drainage and the low-pressure supercooling section drainage are respectively connected to a deaerator through a high-pressure drainage pipe and a low-pressure drainage pipe; a drain tank is arranged behind a drain outlet header of a low-pressure section and a high-pressure section of the primary air pre-heater, drainage is controlled by a regulating valve, and automatic regulation is performed according to the liquid level of the drain tank; the drain part of the high-pressure flash tank is connected with the high-pressure flash tank, and the bottom of the flash tank is provided with a drain outlet which is connected with a deaerator water tank balance pipe; the high-pressure drain flash tank is set to a height that the liquid level in the high-pressure flash tank is higher than the liquid level of the deaerator, and drain water automatically flows by the aid of differential pressure gravity and is connected with a water balance pipe of the deaerator.
Description
Technical Field
The utility model relates to the field of waste incineration, in particular to a modification of a drainage system of an air preheater.
Technical Field
The drainage conditions of the drainage system of the existing steam preheater are as follows: the heating steam of the low-pressure section of the primary air preheater comes from the primary extraction steam (285 ℃ and 1.05MPa) of a steam turbine, becomes condensed hydrophobic after the primary air is heated, and is conveyed to the tower head of the deaerator through a pipeline. The high-pressure section heating steam and SGH heating steam of the primary air-air preheater both come from a steam drum steam extraction main channel (262 ℃, 4.2MPa), steam condensate water after heat release of the heat exchanger is conveyed to a high-pressure drainage flash tank through a high-pressure drainage main pipe, flash steam after flash evaporation is discharged to a deaerator steam balance pipe after flash evaporation is discharged to an atmospheric flash tank, flash steam after flash evaporation is discharged to the atmosphere after flash evaporation is performed, and drainage enters a low-level drainage tank.
If a primary air preheater of a certain project adopts two-stage heating, the first stage adopts the first-stage steam extraction steam (1.05MPa, 285 ℃) of a steam turbine, the designed rated flow is 6.67t/h, and after condensation, drainage is directly returned to a deaerator; the second stage high pressure section adopts steam drum extraction steam (4.8MPa, 261 ℃), the design rated flow is 5.96t/h, and after condensation, drainage is sent to a high pressure drainage flash tank; flash steam in the flash tank enters the deaerator through the steam balance pipe, and water enters the low-level drain tank after passing through the atmospheric flash tank.
SGH heating steam also comes from a steam drum steam extraction main pipe (the designed steam extraction amount is 7.7t/h), and steam condensate water after heating smoke gas is converged into a primary air-air preheater high-pressure section drain pipe and enters a high-pressure drain flash tank together. The parameters are as follows:
table one: primary air preheater parameter table
Table two: SGH preheater parameters
The main problems that exist at present are:
1. after steam in a low-pressure section of the heating primary air preheater is condensed, the drainage pressure is 0.6MPa and 159 ℃, and the steam contains 8-10 percent of steam; after steam in the high-pressure section of the primary air is heated and condensed, the hydrophobic pressure is 0.8MPa and 171 ℃, and 25-30% of steam is accompanied; the hydrophobic pressure of the steam for heating the SGH heat exchanger after condensation is also 0.8MPa and 171 ℃; the hydrophobic heat is not fully utilized.
2. The condensation hydrophobic temperature of the steam of the existing primary air pre-heater and SGH heater after heat exchange is higher, and the steam and water are not efficiently shunted, part of steam directly enters a hydrophobic system, and a heat source is not effectively utilized in the air pre-heater system.
3. Because the heat exchanger steam trap is poor in drainage effect, part of steam is not condensed and enters the main drainage pipe, and steam and water are mixed to scour the drainage pipeline, so that the drainage pipeline is leaked, and the safe operation of the system is seriously influenced.
4. The high pressure drainage flash tank drainage is discharged into the drainage tank after the atmospheric flash tank expansion, and flash steam of the flash tank is discharged into the atmosphere, so that the flash tank cannot be fully utilized.
In view of this, the drainage system of air preheater is planned to be reformed, heat exchange efficiency is improved, energy consumption is saved, and economic benefits are improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a heating steam drainage system which is characterized in that a primary air preheater of the drainage part of an air preheater in the prior art is changed from two-section type to four-section type, a cold air inlet of the primary air preheater is added with a supercooling section heating surface, the low-pressure section drainage and the high-pressure section drainage of the primary air preheater are sent to the supercooling section heating surface for heat exchange, and the high-pressure and low-pressure supercooling section drainage is respectively sent to a deaerator through a high-pressure and low-pressure drainage pipe; meanwhile, an original drainage system is reformed, a drainage tank is added behind a drainage outlet header at a low-pressure section and a high-pressure section of the primary air preheater, a regulating valve is additionally arranged to control drainage, and automatic regulation is performed according to the liquid level of the drainage tank; the bottom of the high-pressure flash tank drainage part is drained after flash, and the original atmospheric flash tank is changed into a balance pipe directly entering a deaerator water tank. The height of the high-pressure drainage flash tank is increased, so that the liquid level in the high-pressure flash tank is higher than the liquid level of the deaerator, and drainage automatically flows into a water balance pipe of the deaerator by virtue of differential pressure gravity.
Through the improvement, during operation:
1) the primary air pre-heater is drained by adopting an adjusting valve, and the adjusting valve is controlled by the liquid level of a drain tank. The hydrophobic temperature was 90 ℃. The drained water enters a deaerator.
2) The primary air preheater is required to be provided with a drain tank, condensed and drained water can smoothly enter the drain tank by means of self-flowing, and the effective volume of the drain tank has water storage capacity of 5 minutes. The top of the drainage tank and the steam inlet of the preheater are provided with steam balance pipes.
3) After the elevation of the high-pressure drainage flash tank is improved, the drainage is automatically flowed to the deaerator.
Drawings
FIG. 1 is a schematic diagram of a hydrophobic structure of a prior art air preheater.
FIG. 2 is a schematic diagram of the hydrophobic structure of the air preheater of the present invention.
FIG. 3 is a schematic diagram of a drainage structure of a conventional high-pressure flash tank.
FIG. 4 is a schematic diagram of the drain structure of the SGH high-pressure flash tank of the present invention.
Detailed Description
The patent will now be further described with reference to the accompanying drawings and examples.
The examples are as follows:
a heating steam drainage system is characterized in that a primary air preheater of a drainage part of an air preheater is changed from two-section type to four-section type, a cold air inlet of the primary air preheater is additionally provided with a supercooling section heating surface, low-pressure section drainage and high-pressure section drainage of the primary air preheater are sent to the supercooling section heating surface for heat exchange, and high-pressure and low-pressure supercooling section drainage is respectively sent to a deaerator through a high-pressure and low-pressure drainage pipe; meanwhile, an original drainage system is reformed, a drainage tank is added behind a drainage outlet header at a low-pressure section and a high-pressure section of the primary air preheater, a regulating valve is additionally arranged to control drainage, and automatic regulation is performed according to the liquid level of the drainage tank; the bottom of the high-pressure flash tank drainage part is drained after flash, and the original atmospheric flash tank is changed into a balance pipe directly entering a deaerator water tank. The height of the high-pressure drainage flash tank is increased, so that the liquid level in the high-pressure flash tank is higher than the liquid level of the deaerator, and drainage automatically flows into a water balance pipe of the deaerator by virtue of differential pressure gravity.
Through the steam drainage system transformation of the primary air blower air preheater, the heat utilization rate is improved, the first-stage steam extraction amount of the steam turbine is reduced by 0.32t/h and the steam extraction amount of the steam drum is reduced by 1.15t/h, and the calculation data is as follows:
2. after the high-pressure drainage flash tank is subjected to drainage transformation, the exhaust steam is reduced by 0.4t/h, and the calculation data is as follows:
3. and (3) calculating to save the enthalpy drop of the steam and the exhaust steam of the condenser, and converting the enthalpy drop into increased power generation capacity, wherein the calculation data is as follows:
the enthalpy value of saturated steam extracted by a steam drum is 2804kJ/kg, the enthalpy value of first-stage extracted steam is 3042kJ/kg, the enthalpy value of flash steam of an atmospheric flash tank is 2675kJ/kg, and the exhaust enthalpy of a condenser is 2351 kJ/kg.
The foregoing description of the embodiments is provided to enable one of ordinary skill in the art to understand and apply the techniques herein, and it is to be understood that various modifications may be readily made to the embodiments, and that the general principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present disclosure is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present disclosure.
Claims (1)
1. A heating steam drainage system is characterized in that a primary air pre-heater of a drainage part of an air pre-heater is provided with four sections, a cold air inlet of the primary air pre-heater is provided with a supercooling section heating surface, low-pressure section drainage and high-pressure section drainage of the primary air pre-heater are connected to the supercooling section heating surface for heat exchange, and high-pressure supercooling section drainage and low-pressure supercooling section drainage are respectively connected to a deaerator through high-pressure and low-pressure drainage pipes; a drain tank is arranged behind a drain outlet header of a low-pressure section and a high-pressure section of the primary air pre-heater, drainage is controlled by a regulating valve, and automatic regulation is performed according to the liquid level of the drain tank; the drain part of the high-pressure flash tank is connected with the high-pressure flash tank, and the bottom of the flash tank is provided with a drain outlet which is connected with a deaerator water tank balance pipe; the high-pressure drain flash tank is set to a height that the liquid level in the high-pressure flash tank is higher than the liquid level of the deaerator, and drain water automatically flows by the aid of differential pressure gravity and is connected with a water balance pipe of the deaerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122039637.XU CN215765034U (en) | 2021-08-26 | 2021-08-26 | Heating steam drainage system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122039637.XU CN215765034U (en) | 2021-08-26 | 2021-08-26 | Heating steam drainage system |
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| Publication Number | Publication Date |
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| CN215765034U true CN215765034U (en) | 2022-02-08 |
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| CN202122039637.XU Active CN215765034U (en) | 2021-08-26 | 2021-08-26 | Heating steam drainage system |
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| CN (1) | CN215765034U (en) |
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2021
- 2021-08-26 CN CN202122039637.XU patent/CN215765034U/en active Active
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