CN210289859U - Deep energy-saving comprehensive utilization device for circulating water waste heat of indirect air cooling unit - Google Patents
Deep energy-saving comprehensive utilization device for circulating water waste heat of indirect air cooling unit Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 111
- 239000002918 waste heat Substances 0.000 title claims abstract description 59
- 239000006096 absorbing agent Substances 0.000 claims abstract description 22
- 239000000428 dust Substances 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 41
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- 238000010438 heat treatment Methods 0.000 description 12
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- 239000007789 gas Substances 0.000 description 6
- 238000011045 prefiltration Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
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- 239000012080 ambient air Substances 0.000 description 1
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Abstract
The utility model relates to an energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth. The utility model provides a turbine unit passes through exhaust pipe with the condenser and is connected, condensate pump is connected with the condenser, the bearing seal heater is connected with condensate pump, low pressure feed water heater and low temperature economizer all are connected with the bearing seal heater, dust collector is connected with the low temperature economizer, the low temperature economizer is connected with the air preheater, the boiler fan heater is connected with the air preheater, the fan is connected with the boiler fan heater, air cleaner is connected with the fan, expansion tank is connected with the boiler fan heater, No. two circulating water pump are connected with expansion tank, the absorber is connected with No. two circulating water pump, the evaporimeter is connected with the absorber, steam condensate outlet pipe and steam admission pipe all are connected with the generator, the generator is connected with the absorber, the condenser is connected with the evaporimeter, the generator is connected with the condenser, the condenser passes through closed circulating water and goes out water piping connection with the boiler fan heater.
Description
Technical Field
The utility model relates to an energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth.
Background
In recent years, with the rapid development of the power industry in China, thermal power generating units with large capacity and high parameters are built in various places throughout the country. For the wide areas in northwest of China, due to the serious shortage of water resources and the national requirement on environmental protection of a newly built unit, indirect air cooling becomes a relatively common mode for exhaust cooling of a steam turbine unit. For the indirect air cooling unit, no matter a hybrid cooling Haylor type indirect air cooling system or a Hamon type indirect air cooling system with a surface condenser is adopted, because the cooling water of the indirect air cooling unit is in closed circulation, the water consumption required by the unit cooling is almost zero, and the consumption of the thermal power generating unit on water resources is reduced to the maximum extent. Meanwhile, because the steam turbine unit exhaust cooling mode of indirect air cooling is adopted, the design backpressure is 7-10kPa higher than that of a water cooling unit, the exhaust temperature under the THA working condition is designed to be more than 50 ℃, the exhaust waste heat of a low-pressure cylinder of a steam turbine accounts for more than 45% of the heat supply quantity of a boiler outlet, and the loss of exhaust heat generated by circulating water which is sent into an indirect cooling tower for cooling is huge.
At present, for indirect air cooling units, the mode of utilizing the waste heat of high-temperature circulating cooling water mainly aims at the indirect air cooling units with heat supply requirements, the waste heat of the high-temperature circulating water is recovered to a winter heating system for utilization, and for a large number of non-heating units, the part of waste heat cannot be fully utilized and can only be exhausted to the atmospheric environment through an air through an indirect cooling tower of the units. The discharge of a large amount of waste heat of the part not only has great loss to the energy consumption of the unit, but also causes inevitable heat pollution to the surrounding environment. Meanwhile, because the northern area of China is long in winter and the climate is cold, when the unit runs in winter, the ambient air temperature is below minus 10 ℃ at least, but primary air and air supply temperature of the boiler are preheated before entering the air preheater according to the design, so that the temperature of the primary air or the air supply is about 25-30 ℃, and low-temperature corrosion and ash blockage of the air preheater caused by the fact that the primary air or the air supply temperature entering the air preheater is too low are reduced. The effect of the primary air and the air supply designed by the existing unit in the boiler air heater is that during the operation of the unit in winter, steam of an auxiliary steam header (four-section steam extraction) at the side of a steam engine is adopted to preheat the primary air and the air supply of the boiler, so that a large amount of high-quality steam can be consumed during the operation of the whole unit in winter, the operation economy of the unit is affected, and meanwhile, the existing waste heat utilization technology for recycling the circulating water waste heat of the indirect air cooling unit to a heating system is low in the practical application process due to the limitation of the heating period, namely the utilization rate of equipment is low. For example, chinese patent publication No. CN104653241A, published as 2015, 05, 27 and is published as a waste heat recovery device for indirect air cooling units, is disclosed, but the waste heat recovery device for indirect air cooling units is difficult to overcome the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide an energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth that structural design is reasonable.
The utility model provides a technical scheme that above-mentioned problem adopted is: this energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth, its structural feature lies in: the system comprises a steam turbine set, a steam exhaust pipeline, a condenser, a low-temperature circulating water pipe, a high-temperature circulating water pipe, an indirect cooling tower, a first circulating water pump, a heat pump water supply pipe, a heat pump water return pipe, an evaporator, an absorber, a generator, a condenser, a closed circulating water outlet pipe, a steam condensate water outlet pipe, a steam inlet pipe, a condensate water pump, an air filter, a fan, a second circulating water pump, an expansion water tank, a boiler air heater, a shaft seal heater, a low-pressure heater, a dust removal device, a low-temperature economizer and an air preheater;
the steam turbine set is connected with the condenser through a steam exhaust pipeline, the condensate pump is connected with the condenser, the shaft seal heater is connected with the condensate pump, the low-pressure heater and the low-temperature economizer are both connected with the shaft seal heater, the dust removal device is connected with the low-temperature economizer, the low-temperature economizer is connected with the air preheater, the boiler heater is connected with the air preheater, the fan is connected with the boiler heater, the air filter is connected with the fan, the expansion water tank is connected with the boiler heater, the second circulating water pump is connected with the expansion water tank, the absorber is connected with the second circulating water pump, the evaporator is connected with the absorber, the steam condensate water outlet pipe and the steam inlet pipe are both connected with the generator, the generator is connected with the absorber, the condenser is connected with the evaporator, and the generator is connected with the condenser, the condenser is connected with the boiler air heater through a closed circulating water outlet pipe, the condenser is connected with the indirect cooling tower through a low-temperature circulating water pipe and a high-temperature circulating water pipe, the evaporator is connected with the low-temperature circulating water pipe through a heat pump return water pipe, and the evaporator is connected with the high-temperature circulating water pipe through a heat pump water supply pipe.
Further, the device for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit also comprises a first isolating valve, a second isolating valve, a first regulating valve, a third isolating valve, a fourth isolating valve, a fifth isolating valve, a second regulating valve, a sixth isolating valve, a seventh isolating valve, an eighth isolating valve and a ninth isolating valve, wherein the first isolating valve and the first regulating valve are sequentially arranged on a heat pump water supply pipe along the flowing direction, the second isolating valve is arranged on a heat pump water return pipe, the third isolating valve is arranged on a pipeline for connecting an expansion water tank and a boiler air heater, the fourth isolating valve is arranged on one branch of a low-temperature economizer, the fifth isolating valve and the ninth isolating valve are both arranged on the other branch of the low-temperature economizer, the eighth isolating valve and the second regulating valve are sequentially arranged on a steam inlet pipe along the flowing reverse direction, and the sixth isolating valve is arranged on a steam condensate water outlet pipe, and the No. seven isolating valve is arranged on the closed circulating water outlet pipe.
Further, the energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth still includes prefilter and water pump, prefilter is connected with air cleaner, the generator passes through the water pump with the absorber and is connected, the condenser is connected with the absorber.
Furthermore, the number of the seven isolating valves is two, and the two seven isolating valves are both installed on the closed circulating water outlet pipe.
Furthermore, one branch of the low-temperature economizer is connected with a condensed water pipeline of the low-pressure heater, and the other branch of the low-temperature economizer is connected with a pipeline between the shaft seal heater and the condensed water pump.
Further, another technical object of the utility model is to provide a comprehensive utilization method of indirect air cooling unit circulating water waste heat degree of depth energy-conserving comprehensive utilization device.
The above technical object of the present invention can be achieved by the following technical solutions.
A comprehensive utilization method of a deep energy-saving comprehensive utilization device for circulating water waste heat of an indirect air cooling unit is characterized by comprising the following steps: the comprehensive utilization method comprises the following steps: the method is characterized in that a low-pressure last-stage or next-last-stage steam extraction driven absorption heat pump set of about 0.1MPa is adopted to recover the circulating water waste heat cooled by a unit workshop cooling tower, the recovered heat is sent to a boiler air heater through a closed circulating water system arranged in the system, the temperature of boiler air supply and primary air is heated to about 90 ℃, and the temperature rise of boiler exhaust gas caused by the temperature rise is recovered to a unit condensate system through a low-temperature economizer of the unit.
Furthermore, an absorption heat pump unit is adopted to recover the circulating water waste heat of the indirect air cooling unit, and the circulating water waste heat is sent to a boiler air heater through a closed circulating water system designed by the system, so that the temperature of boiler air supply and primary air is heated to about 90 ℃.
Furthermore, the waste heat source entering the absorption heat pump unit for waste heat recovery is high-temperature circulating water in a high-temperature circulating water pipe in the indirect air cooling unit, can be directly taken from an outlet of the circulating water pump of the indirect air cooling unit or an outlet of a heat pump water supply pipe of a condenser of the indirect air cooling unit, can fully utilize the power of the circulating water pump in the original design of the unit as drive, and does not need to be additionally provided with a power driving device.
Furthermore, after the high-temperature circulating water of the indirect air cooling unit is subjected to heat recovery through the absorption heat pump, the return water can be directly returned to the circulating water return pipeline of the indirect air cooling unit through the heat pump water return pipe.
Furthermore, a regulating valve is arranged on the water supply pipe of the heat pump, and the flow of circulating water can be regulated and controlled through the regulating valve according to different temperatures of the circulating water under different working conditions, so that the stability of the absorption heat pump set in the operation process can be controlled.
Furthermore, a first isolation valve and a second isolation valve are respectively arranged on the heat pump water supply pipe and the heat pump water return pipe, so that the system is convenient to isolate and overhaul.
Furthermore, a second regulating valve and an eighth isolating valve are arranged on the steam inlet pipe, so that the driving steam quantity is controlled, and the system is isolated and overhauled conveniently.
Furthermore, a number six isolating valves are mounted on the steam condensate water outlet pipe, so that the system is convenient to isolate and overhaul.
And further, a steam condensate outlet pipe of the condensate water for driving the steam returns to a condenser of the indirect air cooling unit.
Furthermore, the system is provided with a closed circulating water system for delivering the heat recovered by the absorption heat pump set to a boiler side primary air and boiler air heater to heat the boiler primary air and the air supply temperature to about 90 ℃.
Furthermore, an expansion water tank is arranged at an inlet of a second circulating water pump in the closed circulating water system and is used for supplementing water to the system and maintaining the stable operation of the closed circulating water system.
Furthermore, a third isolating valve and a seventh isolating valve are arranged on a pipeline for closed circulating water to enter the absorption heat pump unit and a closed circulating water outlet pipe, so that the system is conveniently isolated and overhauled.
Furthermore, the system is provided with a frequency conversion closed type circulating water pump for providing circulating power required by conveying heat recovered by the heat pump unit to a boiler side primary air and air supply air heater, and simultaneously, the system also plays a role in frequency conversion regulation and is used for ensuring that the primary air and the air supply temperature after being heated by the air heater are stabilized at about 90 ℃.
Furthermore, because the system is provided with a closed circulating water system, primary air and supplied air are heated by adopting an air-water heat exchange mode for primary air of the boiler and the air heater of the boiler, and meanwhile, auxiliary steam to an air heater interface pipeline in the original design can be reserved to guarantee the standby of a heat source of the air heater of the boiler and improve the safety and stability of unit operation.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model relates to an adopt indirect air cooling unit low pressure final stage or time final stage to extract steam as drive steam's absorption heat pump group, high temperature circulating water exhaust heat before the cooling tower cooling is advanced to indirect air cooling unit is retrieved, and the circulating water system through system design carries the heat of retrieving to boiler side air heater and air supply, advance the temperature heating to about 90 ℃ with boiler air supply and air, utilize the low temperature economizer system of system design simultaneously, be used for reducing the rising of boiler exhaust gas temperature behind the air preheater that causes because the promotion of boiler air supply temperature, and fill this part heat and retrieve to unit condensate system, and then improve boiler efficiency and unit thermal efficiency's indirect air cooling unit circulating water waste heat degree of depth energy-conserving recycle recovery technique.
The technical scheme designed by the utility model overturns the concept and function of the traditional boiler air heater, can effectively improve the boiler efficiency and the circulating heat efficiency of the unit, reduce the energy consumption of the unit and improve the economical efficiency of the unit operation; in addition, by utilizing the waste heat of high-temperature circulating water before part of the high-temperature circulating water enters the indirect cooling tower for cooling, the heat load of the indirect cooling tower of the unit is reduced, and the running economy of the unit is improved; simultaneously, the device can avoid low-temperature corrosion and ash blockage of the air preheater caused by too low primary air and air supply temperature entering the air preheater by heating primary air and air supply of the boiler, and improves the safety and stability of unit operation.
Drawings
Fig. 1 is the structure schematic diagram of the deep energy-saving comprehensive utilization device for the circulating water waste heat of the harming indirect air cooling unit of the embodiment of the utility model.
Fig. 2 is the structural schematic diagram of the deep energy-saving comprehensive utilization device for the circulating water waste heat of the hailer indirect air cooling unit in the embodiment of the present invention.
In the figure: the system comprises a turboset 1, a steam exhaust pipeline 2, a condenser 3, a low-temperature circulating water pipe 4, a high-temperature circulating water pipe 5, an indirect cooling tower 6, a first circulating water pump 7, a heat pump water supply pipe 8, a heat pump water return pipe 9, a first isolating valve 10, a second isolating valve 11, a first regulating valve 12, an evaporator 13, an absorber 14, a generator 15, a condenser 16, a closed circulating water outlet pipe 17, a steam condensate outlet pipe 18, a steam inlet pipe 19, a condensate pump 20, a third isolating valve 21, a fourth isolating valve 22, an air filter 23, a fan 24, a fifth isolating valve 25, a second regulating valve 26, a sixth isolating valve 27, a seventh isolating valve 28, an eighth isolating valve 29, a ninth isolating valve 30, a second circulating water pump 31, an expansion water tank 32, a boiler air heater 33, a shaft seal heater 34, a low-pressure heater 35, a dust removal device 36, a low-temperature economizer 37, an air preheater 38, a pre-filter 39, a pre-positioned filter 39, a, And a water pump 40.
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 2, it should be understood that the structures, ratios, sizes, etc. shown in the drawings attached to the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essence, and any modification of the structures, changes of the ratio relationship, or adjustment of the sizes should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, in the present specification, if the terms such as "upper", "lower", "left", "right", "middle" and "one" are used, they are not intended to limit the scope of the present invention, but to limit the relative relationship between the terms and the terms, and the scope of the present invention is not to be considered as the scope of the present invention.
The device for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit in the embodiment comprises a steam turbine unit 1, a steam exhaust pipeline 2, a condenser 3, a low-temperature circulating water pipe 4, a high-temperature circulating water pipe 5, an indirect cooling tower 6, a first circulating water pump 7, a heat pump water supply pipe 8, a heat pump water return pipe 9, an evaporator 13, an absorber 14, a generator 15, a condenser 16, a closed circulating water outlet pipe 17, a steam condensate outlet pipe 18, a steam inlet pipe 19, a condensate pump 20, an air filter 23, a fan 24, a second circulating water pump 31, an expansion water tank 32, a boiler air heater 33, a shaft seal heater 34, a low-pressure heater 35, a dust removal device 36, a low-temperature economizer 37, an air preheater 38, a pre-filter 39, a water pump 40, a first isolation valve 10, a second isolation valve 11, a first regulating valve 12, a third isolation valve 21, a fourth isolation valve 22, a fifth isolation valve 25, regulating valve number two 26, isolating valve number six 27, isolating valve number seven 28, isolating valve number eight 29 and isolating valve number nine 30.
In the embodiment, the turboset 1 is connected with a condenser 3 through a steam exhaust pipeline 2, a condensate pump 20 is connected with the condenser 3, a shaft seal heater 34 is connected with the condensate pump 20, a low-pressure heater 35 and a low-temperature economizer 37 are both connected with the shaft seal heater 34, a dust removal device 36 is connected with the low-temperature economizer 37, the low-temperature economizer 37 is connected with an air preheater 38, a boiler air heater 33 is connected with the air preheater 38, a fan 24 is connected with the boiler air heater 33, an air filter 23 is connected with the fan 24, an expansion water tank 32 is connected with the boiler air heater 33, a second circulating water pump 31 is connected with the expansion water tank 32, an absorber 14 is connected with a second circulating water pump 31, an evaporator 13 is connected with the absorber 14, a steam condensate water outlet pipe 18 and a steam inlet pipe 19 are both connected with the generator 15, the generator 15 is connected with the absorber 14, the condenser 16 is connected with the evaporator 13, and the generator 15 is connected with the condenser 16, the condenser 16 is connected with the boiler air heater 33 through a closed circulating water outlet pipe 17, the condenser 3 is connected with the indirect cooling tower 6 through a low-temperature circulating water pipe 4 and a high-temperature circulating water pipe 5, the evaporator 13 is connected with the low-temperature circulating water pipe 4 through a heat pump water return pipe 9, the evaporator 13 is connected with the high-temperature circulating water pipe 5 through a heat pump water supply pipe 8, the pre-filter 39 is connected with the air filter 23, the generator 15 is connected with the absorber 14 through a water pump 40, and the condenser 16 is connected with the absorber 14.
In the embodiment, a first isolation valve 10 and a first regulating valve 12 are sequentially installed on a heat pump water supply pipe 8 along a flow direction, a second isolation valve 11 is installed on a heat pump water return pipe 9, a third isolation valve 21 is installed on a pipeline connecting an expansion water tank 32 and a boiler air heater 33, a fourth isolation valve 22 is installed on one branch of a low-temperature economizer 37, a fifth isolation valve 25 and a ninth isolation valve 30 are both installed on the other branch of the low-temperature economizer 37, an eighth isolation valve 29 and a second regulating valve 26 are sequentially installed on a steam inlet pipe 19 along a flow reverse direction, a sixth isolation valve 27 is installed on a steam condensate water outlet pipe 18, a seventh isolation valve 28 is installed on a closed circulating water outlet pipe 17, the number of the seventh isolation valves 28 is two, the two seventh isolation valves 28 are both installed on the closed circulating water outlet pipe 17, one branch of the low-temperature economizer 37 is connected with a condensate water pipe of a low-pressure heater 35, the other branch of the low-temperature economizer 37 is connected to a pipe between the shaft seal heater 34 and the condensate pump 20.
The comprehensive utilization method of the deep energy-saving comprehensive utilization device for the circulating water waste heat of the indirect air cooling unit in the embodiment comprises the following steps: the method is characterized in that a low-pressure last-stage or next-last-stage steam extraction driven absorption heat pump set of about 0.1MPa is adopted to recover the circulating water waste heat cooled by a unit workshop cooling tower 6, the recovered heat is sent to a boiler air heater 33 through a closed circulating water system arranged in the system, the temperature of boiler air supply and primary air is heated to about 90 ℃, and the temperature rise of boiler exhaust gas caused by the temperature rise is recovered to a unit condensate system through a low-temperature economizer 37 of the unit.
Preferably, the waste heat of the circulating water of the indirect air cooling unit is recovered by an absorption heat pump unit, and the waste heat is sent to the boiler air heater 33 through a closed circulating water system designed by the system, so that the temperature of the boiler air supply and the primary air is heated to about 90 ℃.
Preferably, the waste heat source entering the absorption heat pump unit for waste heat recovery is high-temperature circulating water in a high-temperature circulating water pipe 5 in the indirect air cooling unit, the high-temperature circulating water can be directly taken from an outlet of the circulating water pump of the indirect air cooling unit or an outlet of a heat pump water supply pipe 8 of a condenser of the indirect air cooling unit, the power of the circulating water pump in the original design of the unit can be fully utilized as driving, and an additional power driving device is not required.
Preferably, after the heat recovery is performed on the high-temperature circulating water of the indirect air-cooling unit through the absorption heat pump, the return water can be directly returned to the circulating water return pipeline of the indirect air-cooling unit through the heat pump water return pipe 9.
Preferably, the first regulating valve 12 is arranged on the heat pump water supply pipe 8, and the flow of the circulating water can be regulated and controlled through the first regulating valve 12 according to different temperatures of the circulating water under different working conditions, so as to control the stability of the absorption heat pump set in the operation process.
Preferably, a first isolation valve 10 and a second isolation valve 11 are respectively arranged on the heat pump water supply pipe 8 and the heat pump water return pipe 9, so that the system is isolated and maintained conveniently.
Preferably, a second regulating valve 26 and an eighth isolating valve 29 are arranged on the steam inlet pipe 19, so that the driving steam quantity is controlled, and the system is isolated and overhauled conveniently.
Preferably, a number six isolation valve 27 is arranged on the steam condensate outlet pipe 18, so that the isolation and the overhaul of the system are facilitated.
Preferably, the condensed water steam-driven condensed water outlet pipe 18 returns to the condenser 3 of the indirect air-cooling unit.
Preferably, the system is provided with a closed circulating water system for supplying the heat recovered by the absorption heat pump unit to the boiler side primary air and boiler air heater 33 to heat the boiler primary air and the supply air to about 90 ℃.
Preferably, an expansion tank 32 is arranged at the inlet of the second circulating water pump 31 in the closed circulating water system, and is used for supplementing water to the system and maintaining the stable operation of the closed circulating water system.
Preferably, a third isolating valve 21 and a seventh isolating valve 28 are arranged on a pipeline for closed circulating water to enter the absorption heat pump unit and a closed circulating water outlet pipe 17, so that the system is conveniently isolated and overhauled.
Preferably, the system is provided with a variable-frequency closed circulating water pump for providing circulating power required by conveying heat recovered by the heat pump unit to a boiler side primary air and air supply air heater, and simultaneously, the system also has a variable-frequency adjusting function for ensuring that the primary air and the air supply temperature after being heated by the air heater are stabilized at about 90 ℃.
Preferably, because the system is provided with a closed circulating water system, primary air and supplied air are heated by adopting an air-water heat exchange mode for primary air of the boiler and the air heater 33 of the boiler, and meanwhile, auxiliary steam in the original design can be reserved to the air heater interface pipeline, so that the standby of a heat source of the air heater 33 of the boiler is guaranteed, and the safety and stability of unit operation are improved.
The device and the method for deeply and comprehensively utilizing the circulating water waste heat of the indirect air cooling unit are characterized in that low-pressure last-stage or penultimate-stage steam extraction of the indirect air cooling unit is adopted as an absorption heat pump unit for driving steam, high-temperature circulating water waste heat before the indirect air cooling unit enters an indirect cooling tower for cooling is recovered, the recovered heat is conveyed to a primary air and air supply air heater at the side of a boiler through a circulating water system arranged by the system, and the air supply temperature and the air inlet temperature of the primary air of the boiler are heated to about 90 ℃; meanwhile, a low-temperature economizer system designed by the system is used for reducing the rise of the exhaust gas temperature of the boiler behind the air preheater caused by the rise of the primary air and air supply temperature of the boiler, and the part of heat is fully recycled to the high-temperature circulating water waste heat deep energy-saving comprehensive utilization and recycling technology of the indirect air cooling unit of the unit condensed water system. The method and the device can improve the boiler efficiency and the unit circulating heat efficiency, reduce the unit energy consumption, improve the unit operation economy and simultaneously reduce the heat pollution caused by discharging a large amount of exhaust heat to the periphery for replacement.
For a 600MW interstage air cooling unit, the back pressure under the THA working condition is 12kPa, and the corresponding saturation temperature is 49.5 ℃. For the indirect air cooling unit's of make full use of circulating water waste heat, reduce energy consumption loss, improve the economic nature of unit operation, reduce the environmental heat pollution that the unit exhaust heat emission caused simultaneously, the utility model discloses an absorption heat pump group, high temperature circulating water exhaust heat before the indirect air cooling unit advances the cooling tower cooling is retrieved, and carry the heat of retrieving to boiler side air heater and air supply through the circulating water system of system design, advance the temperature heating to about 90 ℃ with boiler air supply and air, utilize the low temperature economizer system of system design simultaneously, be used for reducing the rising of boiler exhaust gas temperature behind the air preheater that the promotion of boiler air supply temperature caused owing to boiler air supply and air supply temperature, and fill this part heat and retrieve to unit condensate system.
The utility model discloses energy-conserving comprehensive utilization method of indirect air cooling unit circulating water waste heat degree of depth and device is the absorption heat pump package that adopts the low pressure final stage or the penultimate stage steam extraction of pressure about 0.1MPa as drive steam, carries out recycle to the high temperature circulating water exhaust heat of indirect air cooling unit before advancing the cooling tower cooling to the circulating water system through system setting carries the heat of retrieving to boiler side air heater and air supply, advances the temperature heating to about 90 ℃ with boiler air supply and air. The waste heat source entering the absorption heat pump unit for waste heat recovery is high-temperature circulating water of the indirect air cooling unit, can be directly taken from an outlet of a circulating water pump of the indirect air cooling unit, can fully utilize the power of the circulating water pump in the original design of the unit as drive, and does not need to be additionally provided with an additional power driving device. After the high-temperature circulating water of the indirect air cooling unit is subjected to heat recovery and cooling through the absorption heat pump, the return water can directly return to a circulating water return pipeline of the indirect air cooling unit. The driving steam of the absorption heat pump can adopt the low-pressure final stage or the penultimate stage of the unit with the pressure grade of 0.1MPa for steam extraction, and the condensed water of the driving steam can be recycled to the hot well of the indirect air cooling unit through a pipeline. The system is provided with a special closed circulating water system which is used for conveying heat recovered by the absorption heat pump set to a boiler side primary air and air supply air heater to heat the boiler side primary air and the air supply air heater, and heating boiler air supply and primary air inlet temperature to about 90 ℃.
The following cases are realized by the device and the method for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit:
1. taking a 600MW Hamon type indirect air cooling unit of a certain plant as an example, seven-section steam extraction of the unit is adopted as driving steam of an absorption heat pump through calculation, the annual average load rate of the unit is 80%, the primary air and air supply temperature entering an air preheater are taken as boundary conditions under a design working condition (90 ℃), the calculation is respectively carried out according to the average temperature of four seasons of spring, summer, autumn and winter of the site of the plant, and the annual investment amount of the device can be saved by 458 ten thousand yuan.
2. The input of the device can effectively absorb the circulating water waste heat of the indirect air cooling unit, so that the heat load of the inter-unit cooling tower is effectively reduced, the waste heat effectively utilized in the high-temperature circulating water of the indirect air cooling unit under the working condition accounts for about 2.1% of the heat load of the inter-unit cooling tower, the running backpressure of the unit is reduced, and the running economy of the unit is improved.
3. The utility model discloses the input of device improves the boiler once wind and air supply temperature to about 90 ℃, can effectively avoid because the low temperature corrosion of the air preheater that leads to the fact is crossed to the once wind that gets into the air preheater and air supply temperature and the emergence of stifled grey phenomenon, has improved the safety and stability nature of unit operation.
For the harmon type indirect air cooling system (see fig. 1), the following is specified:
according to the device and the method for deeply and comprehensively utilizing the circulating water waste heat of the indirect air cooling unit, a waste heat source entering the absorption heat pump unit for waste heat recovery is high-temperature circulating water in a high-temperature circulating water pipe 5 of the indirect air cooling unit, can be directly taken from an outlet of a heat pump water supply pipe 8 of a circulating water pump of the indirect air cooling unit, can fully utilize the power of the circulating water pump in the original design of the unit as drive, and does not need to be additionally provided with a power driving device. After the heat recovery is carried out on the high-temperature circulating water of the indirect air cooling unit through the absorption heat pump, the return water can be directly returned to the circulating water return pipeline of the indirect air cooling unit through the heat pump water return pipe 9. A first regulating valve 12 is arranged on the heat pump water supply pipe 8, and the flow of circulating water can be regulated by the regulating valve according to the difference of the temperature of the circulating water under different working conditions so as to control, and further control the stability of the absorption heat pump set in the operation process; a first isolation valve 10 and a second isolation valve 11 are respectively arranged on the heat pump water supply pipe 8 and the heat pump water return pipe 9, so that the system is isolated and maintained conveniently.
The device and the method for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit in an energy-saving manner adopt low-pressure final-stage or secondary-stage steam extraction with the pressure of about 0.1MPa as an absorption heat pump unit for driving steam, and an eight-type isolation valve 29 and a two-type adjusting valve 26 are arranged on a steam inlet pipe 19, so that the control of the driving steam quantity and the isolation and the maintenance of a system are facilitated. And a sixth isolating valve 27 is arranged on the steam condensate water outlet pipe 18, so that the system is conveniently isolated and overhauled. The condensed water for driving the steam can be returned to the condenser 3 of the indirect air cooling unit through the steam condensed water outlet pipe 18.
The device and the method for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit in an energy-saving manner are characterized in that a special closed circulating water system is arranged, a variable-frequency closed circulating water pump is used for conveying the circulating water which absorbs heat in an absorption heat pump unit to a primary air at the boiler side and a boiler air heater 33, and the primary air and the supplied air which pass through the variable-frequency closed circulating water pump are heated to about 90 ℃ so as to replace steam which is used for heating the primary air and the supplied air of the boiler by an auxiliary steam header (four-section steam extraction) adopted in the original design, and the running economy of the unit is improved. The expansion tank 32 is used for supplementing water to the closed circulating water system, so that the running safety of the system is guaranteed.
The device and the method for deeply and comprehensively utilizing the waste heat of the circulating water of the indirect air cooling unit save energy, and a low-temperature economizer system is designed for reducing the rise of the exhaust gas temperature of the boiler behind the air preheater 38 caused by the rise of the primary air and air supply temperature of the boiler and recycling part of heat to a unit condensed water system. The condensate pipeline of the low-temperature economizer 37 is provided with a nine-size isolating valve 30 for automatically adjusting the temperature of the condensate after heating, so that the temperature of the condensate after heating is matched with the temperature of the condensate main pipe, and the vibration of the condensate pipeline caused by the temperature deviation after the condensate is mixed is avoided.
According to the device and the method for deeply and comprehensively utilizing the circulating water waste heat of the indirect air cooling unit, a special automatic control module can be further arranged in a DCS control system of the unit, and the operation of the whole device is automatically controlled according to the change of the operation working condition of the unit by calculating the frequency of a first regulating valve 12, a second regulating valve 26, a ninth isolating valve 30 and a variable-frequency circulating water pump arranged in the control system, so that the stability of the operation of the system is guaranteed.
For the hehler type indirect air cooling system (see fig. 2), the embodiment is the same as that of the harmon type indirect air cooling system.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The utility model provides an energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth which characterized in that: the system comprises a steam turbine set (1), a steam exhaust pipeline (2), a condenser (3), a low-temperature circulating water pipe (4), a high-temperature circulating water pipe (5), an indirect cooling tower (6), a first circulating water pump (7), a heat pump water supply pipe (8), a heat pump water return pipe (9), an evaporator (13), an absorber (14), a generator (15), a condenser (16), a closed circulating water outlet pipe (17), a steam condensate outlet pipe (18), a steam inlet pipe (19), a condensate pump (20), an air filter (23), a fan (24), a second circulating water pump (31), an expansion water tank (32), a boiler air heater (33), a shaft seal heater (34), a low-pressure heater (35), a dust removal device (36), a low-temperature economizer (37) and an air preheater (38);
the steam turbine set (1) is connected with a condenser (3) through a steam exhaust pipeline (2), a condensate pump (20) is connected with the condenser (3), a shaft seal heater (34) is connected with the condensate pump (20), a low-pressure heater (35) and a low-temperature economizer (37) are both connected with the shaft seal heater (34), a dust removal device (36) is connected with the low-temperature economizer (37), the low-temperature economizer (37) is connected with an air preheater (38), a boiler air heater (33) is connected with the air preheater (38), a fan (24) is connected with a boiler air heater (33), an air filter (23) is connected with the fan (24), an expansion water tank (32) is connected with the boiler air heater (33), a second circulating water pump (31) is connected with the expansion water tank (32), and an absorber (14) is connected with a second circulating water pump (31), the steam condenser is characterized in that the evaporator (13) is connected with the absorber (14), the steam condensate water outlet pipe (18) and the steam inlet pipe (19) are connected with the generator (15), the generator (15) is connected with the absorber (14), the condenser (16) is connected with the evaporator (13), the generator (15) is connected with the condenser (16), the condenser (16) is connected with the boiler air heater (33) through the closed circulating water outlet pipe (17), the condenser (3) is connected with the indirect cooling tower (6) through the low-temperature circulating water pipe (4) and the high-temperature circulating water pipe (5), the evaporator (13) is connected with the low-temperature circulating water pipe (4) through the heat pump water return pipe (9), and the evaporator (13) is connected with the high-temperature circulating water pipe (5) through the heat pump water supply pipe (8).
2. The deep energy-saving comprehensive utilization device for the waste heat of the circulating water of the indirect air cooling unit according to claim 1, is characterized in that: the energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth still includes isolation valve (10), No. two isolation valves (11), governing valve (12), No. three isolation valve (21), No. four isolation valve (22), No. five isolation valve (25), No. two governing valves (26), No. six isolation valves (27), No. seven isolation valve (28), No. eight isolation valves (29) and No. nine isolation valves (30), install on heat pump delivery pipe (8) along flow direction in proper order isolation valve (10) and No. one governing valve (12), No. two isolation valve (11) are installed on heat pump wet return (9), No. three isolation valve (21) are installed on the pipeline that expansion tank (32) and boiler air heater (33) are connected, No. four isolation valve (22) are installed on a branch road of low temperature economizer (37), No. five isolation valve (25) and No. nine isolation valve (30) are all installed in another low temperature branch of economizer (37) On the way, No. eight isolating valve (29) and No. two governing valves (26) are installed on steam inlet pipe (19) along flowing reverse in proper order, No. six isolating valve (27) are installed on steam condensate outlet pipe (18), No. seven isolating valve (28) are installed on closed circulating water outlet pipe (17).
3. The deep energy-saving comprehensive utilization device for the waste heat of the circulating water of the indirect air cooling unit according to claim 1, is characterized in that: the energy-conserving comprehensive utilization device of indirect air cooling unit circulating water waste heat degree of depth still includes leading filter (39) and water pump (40), leading filter (39) are connected with air cleaner (23), generator (15) are connected through water pump (40) with absorber (14), condenser (16) are connected with absorber (14).
4. The deep energy-saving comprehensive utilization device for the waste heat of the circulating water of the indirect air cooling unit according to claim 2, is characterized in that: the number of the seven isolating valves (28) is two, and the two seven isolating valves (28) are installed on the closed circulating water outlet pipe (17).
5. The deep energy-saving comprehensive utilization device for the waste heat of the circulating water of the indirect air cooling unit according to claim 2, is characterized in that: one branch of the low-temperature economizer (37) is connected with a condensed water pipeline of the low-pressure heater (35), and the other branch of the low-temperature economizer (37) is connected with a pipeline between the shaft seal heater (34) and the condensed water pump (20).
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| CN201920664764.9U CN210289859U (en) | 2019-05-10 | 2019-05-10 | Deep energy-saving comprehensive utilization device for circulating water waste heat of indirect air cooling unit |
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| CN201920664764.9U CN210289859U (en) | 2019-05-10 | 2019-05-10 | Deep energy-saving comprehensive utilization device for circulating water waste heat of indirect air cooling unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185507A (en) * | 2019-05-10 | 2019-08-30 | 华电电力科学研究院有限公司 | A kind of indirect air cooling unit circulating water afterheat depth energy saving comprehensive utilization device and method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185507A (en) * | 2019-05-10 | 2019-08-30 | 华电电力科学研究院有限公司 | A kind of indirect air cooling unit circulating water afterheat depth energy saving comprehensive utilization device and method |
| CN110185507B (en) * | 2019-05-10 | 2023-12-05 | 华电电力科学研究院有限公司 | Deep energy-saving comprehensive utilization device and method for circulating water waste heat of indirect air cooling unit |
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