CN211011462U - System for utilize condensate water to improve air heater and adjust cold and hot overgrate air temperature - Google Patents
System for utilize condensate water to improve air heater and adjust cold and hot overgrate air temperature Download PDFInfo
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- CN211011462U CN211011462U CN201921221720.5U CN201921221720U CN211011462U CN 211011462 U CN211011462 U CN 211011462U CN 201921221720 U CN201921221720 U CN 201921221720U CN 211011462 U CN211011462 U CN 211011462U
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Abstract
The utility model discloses a system for adjusting the temperature of cold and hot primary and secondary air by utilizing condensed water to improve a fan heater, which comprises an air preheater, and an air preheater primary air inlet pipeline, an air preheater primary air outlet pipeline, an air preheater secondary air inlet pipeline, an air preheater secondary air outlet pipeline, an air inlet heat exchanger, an air outlet heat exchanger and a steam turbine condensed water system which are arranged on the air preheater, wherein the air inlet heat exchanger is arranged on the air preheater primary air inlet pipeline or the secondary air inlet pipeline; the air outlet heat exchanger is arranged on a primary air outlet pipeline or a secondary air outlet pipeline of the air preheater; the air inlet heat exchanger and the air outlet heat exchanger are arranged on the side of the condensate system and are arranged on the water inlet pipeline and the water return pipeline of the condensate water of the steam turbine in a parallel or serial mode. The utility model discloses utilize gas-water heat transfer, compare with traditional vapour-gas heat transfer efficiency high, can avoid air heater acid dew point corruption, can improve the air heater life-span, reduce the running cost of power plant.
Description
Technical Field
The utility model belongs to the technical field of thermal power generating unit boiler, concretely relates to utilize condensate water to improve system that warm braw ware adjusted cold and hot overgrate air temperature.
Background
Because of the endowment of rich coal, little gas and poor oil, the energy structure of China takes coal as a pillar, and thus the electricity production of China also takes coal electricity as the main part. According to 2016 years of data of the national statistical bureau, 449000 tons of standard coal are totally consumed by China, wherein coal, petroleum and natural gas respectively account for 60.4%, 18.8% and 7.0%. Meanwhile, when the production of coal electricity, water electricity, nuclear electricity and wind electricity in China is 44371, 11934, 2133 and 2371 million and millions respectively, the sum of the electric power production of other forms is not as good as that of the coal electricity. Therefore, the innovation of the thermal power technology has a positive effect on the efficient utilization of energy in China.
If the environmental temperature is too low or the sulfur content of the coal is too high, the temperature of the cold end wall of the air preheater of the boiler is possibly lower than the acid dew point temperature of the flue gas, so that a plurality of thermal power generating units are provided with air heaters to protect the air preheater from being corroded.
The boiler air heater is a heat exchanger which utilizes low-pressure steam extraction of a steam turbine to heat air at the inlet of the air preheater and is arranged between the outlet of a blower and the inlet of the air preheater, so that the temperature of primary and secondary air at the inlet of the air preheater can be increased, and the problems of dewing, dust deposition and low-temperature corrosion of the air preheater caused by the entering of a large amount of cold air can be avoided as much as possible. The extracted steam of the steam turbine is condensed into hydrophobic steam after the heat exchange between the air heater and the cold primary air and the cold secondary air, and the main contradiction of the operation problem of the air heater of the boiler comes from a condensation hydrophobic system. The unsmooth drainage leads to the unable recovery of comdenstion water, and then leads to the existence of steam-water mixture in the fan heater, and then makes the fan heater take place the water hammer, causes pipeline vibration, fracture, and the fan heater can't be put into operation. An important condition for the normal operation of a boiler air heater is therefore to keep the condensate water free.
The drainage of the air heater is generally divided into two modes, namely an oxygen removal device and a condenser removal device, and the two modes have defects respectively. The 'oxygen remover' drainage mode system is complex, and the floor area of the drainage tank and the drainage pump is large. The drain tank is a pressure container, and a certain volume is required to be provided for steam-water separation, so that a liquid level meter needs to be designed, and the start and stop of the drain pump are determined by reading. Meanwhile, the arrangement position of the drain tank cannot be too low to prevent the inlet of the drain pump from cavitation. Both of these features reduce the life of the pump. The deaerator is arranged at a higher position, and the drainage pump has enough lift, so that the manufacturing cost of a drainage system is increased. The 'condenser removing' mode is relatively simple, and the drainage system only has one link of an automatic steam trap, so the drainage system completely depends on an expensive import steam trap.
The control modes of the drainage system are divided into two modes, namely steam side regulation and water side regulation. The most common way of vapor side regulation is: the temperature of cold air at the inlet of the air preheater is adjusted by adjusting the steam flow, the change of the steam flow can lead the steam saturation temperature to change along with the change of the cold air, namely the steam consumption and the temperature of the air heater can be synchronously changed, and the steam trap is easy to break down by the adjusting mode, so the requirement on the steam trap is higher; the steam flow is adjusted through adjusting hydrophobic flow to the water side regulation, and pressure is the steam supply pressure all the time in the fan heater, so saturation temperature is unchangeable, and this mode changes the heat load of fan heater through changing the height of the inside water level of fan heater promptly and change heat transfer area, but because there is two-phase steam and water in the fan heater, arouse water hammer and vibration, thermal stress, corruption and freeze scheduling problem easily.
Disclosure of Invention
The congenital defect that various hydrophobic methods and the control mode to steam air heater exist, the utility model provides an utilize the condensate water to improve the system that the air heater adjusted cold and hot overgrate air temperature, can solve current steam air heater hydrophobic inconvenient and because there is the double-phase problem that makes air heater water attack of soda, can also improve one that gets into air heater, the temperature of overgrate cold wind, avoid air heater low temperature corrosion, and one behind the adjustment air heater, the hot-blast temperature of overgrate, reduce the coal pulverizer entry and mix the cold wind volume, reduce a fan and exert oneself.
The utility model discloses by-pass the hydrophobic problem of fan heater, utilize the condensate water, rather than the steam extraction improves the wind temperature that gets into air heater as heat transfer working medium. The parameters such as pressure, temperature and the like of the condensed water are lower than those of steam, so that the requirement on equipment materials is lower; the change of the temperature of the condensed water can not influence the volume, and the heat exchange working environment can not be too severe. Therefore, the utility model discloses compare with the condensate water heat transfer and have a great deal of advantage with the steam heat transfer.
It should be noted that the condensed water is a common heat exchange medium for example, and the open cycle type, the closed cycle water, the industrial water, etc. can be used as the heat exchange medium of the system.
The utility model discloses a following technical scheme realizes:
the utility model discloses a system for utilizing condensed water to improve air heater and adjust cold and hot one overgrate air temperature, including air heater and air heater primary air inlet pipeline, air heater primary air outlet pipeline, air heater overgrate air inlet pipeline, air heater overgrate air outlet pipeline that set up on air heater, still include air inlet heat exchanger, air-out heat exchanger and steam turbine condensed water system, air inlet heat exchanger set up on air heater primary air inlet pipeline or overgrate air inlet pipeline; the air outlet heat exchanger is arranged on a primary air outlet pipeline or a secondary air outlet pipeline of the air preheater; the air inlet heat exchanger and the air outlet heat exchanger are arranged on the side of the condensate system and are arranged on the steam turbine condensate water inlet pipeline and the water return pipeline in a parallel or serial mode.
Specifically, on the flue gas side, the air preheater air inlet heat exchanger comprises an air preheater primary air inlet heat exchanger, the air outlet heat exchanger comprises an air preheater primary air outlet heat exchanger, the air preheater primary air inlet heat exchanger is arranged on a primary air inlet pipeline, and the air preheater primary air outlet heat exchanger is arranged on a primary air outlet pipeline of the air preheater; and on the side of the condensate system, the primary air inlet heat exchanger of the air preheater and the primary air outlet heat exchanger of the air preheater are connected in series.
Furthermore, a first bypass pipeline is arranged on a main pipeline of the condensed water incoming water and return water of the steam turbine; a second bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the primary air inlet heat exchanger of the air preheater; and a third bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the primary air outlet heat exchanger of the air preheater.
Specifically, on the flue gas side, air inlet heat exchanger include air heater overgrate air import heat exchanger, the air-out heat exchanger include air heater overgrate air play heat exchanger, wherein, air heater overgrate air import heat exchanger sets up on air heater overgrate air inlet line, air heater overgrate air export heat exchanger sets up on air heater overgrate air goes out the pipeline, air heater overgrate air import heat exchanger and air heater overgrate air export heat exchanger are connected with the mode that concatenates.
Furthermore, a first bypass pipeline is arranged on the water inlet pipeline and the water return pipeline of the steam turbine condensed water system; a fourth bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the secondary air inlet heat exchanger of the air preheater; and a fifth bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the secondary air outlet heat exchanger of the air preheater.
Specifically, on the flue gas side, air inlet heat exchanger include air heater primary air import heat exchanger and air heater overgrate air import heat exchanger, the air-out heat exchanger include air heater primary air export heat exchanger and air heater overgrate air export heat exchanger, wherein, air heater primary air import heat exchanger sets up on air heater primary air intake duct, air heater primary air export heat exchanger sets up on air heater primary air goes out the tuber pipe way, air heater overgrate air import heat exchanger sets up on air heater overgrate air intake duct, air heater overgrate air export heat exchanger sets up on air heater overgrate air goes out the tuber pipe way. On the side of the condensate system, the air preheater primary air inlet heat exchanger, the air preheater primary air outlet heat exchanger, the air preheater secondary air inlet heat exchanger and the air preheater secondary air outlet heat exchanger are connected in series.
Specifically, on the flue gas side, the air inlet heat exchanger comprises an air preheater primary air inlet heat exchanger and an air preheater secondary air inlet heat exchanger, the air outlet heat exchanger comprises an air preheater primary air outlet heat exchanger and an air preheater secondary air inlet heat exchanger, the air preheater primary air inlet heat exchanger is arranged on a primary air inlet pipeline of the air preheater, the air preheater primary air outlet heat exchanger is arranged on a primary air outlet pipeline of the air preheater, the air preheater secondary air inlet heat exchanger is arranged on a secondary air inlet pipeline of the air preheater, and the air preheater secondary air outlet heat exchanger is arranged on a secondary air outlet pipeline of the air preheater; on the side of a condensate system, a branch formed by connecting an air preheater primary air inlet heat exchanger and an air preheater secondary air inlet heat exchanger in series or in parallel and a branch formed by connecting an air preheater primary air outlet heat exchanger and an air preheater secondary air outlet heat exchanger in series or in parallel are connected in parallel on a water supply and return pipeline of a turbine condensate system.
Furthermore, a first bypass pipeline is arranged on a condensed water inlet and outlet pipeline of the steam turbine condensed water system connected to the system; a second bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the primary air inlet heat exchanger of the air preheater; a third bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the primary air outlet heat exchanger of the air preheater; a fourth bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the secondary air inlet heat exchanger of the air preheater; a fifth bypass pipeline is arranged at a condensed water inlet and a condensed water outlet of the secondary air outlet heat exchanger of the air preheater; the sixth bypass pipeline is arranged between a condensed water inlet of the primary air inlet heat exchanger of the air preheater and a condensed water outlet of the secondary air inlet heat exchanger of the air preheater; and the seventh bypass pipeline is arranged between a condensed water inlet of the air preheater primary air outlet heat exchanger and a condensed water outlet of the air preheater secondary air outlet heat exchanger.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses utilize gas-water heat transfer, compare with traditional vapour-gas heat transfer efficiency high, just the utility model discloses used system is less than conventional air heater area. The heat exchanger can be reasonably designed and selected according to the heat exchange condition of the condensed water and the air. The temperature of the primary air and the secondary air which need to be heated in front of the air preheater is calculated according to parameters of coal types used by the power plant, the local environment temperature, the performance of the air preheater and the like, and a small amount of condensed water is needed for heat exchange.
(2) The utility model discloses system and method can avoid air heater acid dew point to corrode, can improve empty pre-heater life-span, reduce the power plant running cost. The temperature of the primary air and the secondary air can be adjusted by only leading out a certain flow of condensed water from the condensed water system and utilizing the condensed water to transfer heat between the cold air and the hot air.
(3) The system of the utility model can exchange heat by using the condensed water of the power plant, and can also exchange heat by using the originally existing open water or closed water; the heat exchange medium can exchange heat with hot air firstly and then exchange heat with cold air (similar to countercurrent), and also can exchange heat with cold air firstly and then exchange heat with hot air (similar to concurrent); only primary air or secondary air can be considered, primary air and secondary air can also be comprehensively considered, and heat exchange media and modes are flexible.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
Fig. 1 is a schematic system diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic system diagram of embodiment 2 of the present invention.
Fig. 3 is a schematic system diagram of embodiment 3 of the present invention.
Fig. 4 is a schematic system diagram of embodiment 4 of the present invention.
Fig. 5 is a schematic system diagram of embodiment 5 of the present invention.
Fig. 6 is a schematic system diagram of embodiment 6 of the present invention.
Fig. 7 is a schematic system diagram of embodiment 7 of the present invention.
Fig. 8 is a schematic system diagram of embodiment 8 of the present invention.
The reference numerals in the figures denote:
100-a boiler;
200-an air preheater, 201-a front boiler flue of the air preheater, 202-a rear boiler flue of the air preheater, 203-a primary air inlet pipeline of the air preheater, 204-a primary air outlet pipeline of the air preheater, 205-a secondary air inlet pipeline of the air preheater and 206-a secondary air outlet pipeline of the air preheater;
301-air preheater primary air inlet heat exchanger, 302-air preheater secondary air inlet heat exchanger;
401-air preheater primary air outlet heat exchanger, 402-air preheater secondary air outlet heat exchanger;
500-a first bypass duct, 501-a second bypass duct, 502-a third bypass duct, 503-a fourth bypass duct, 504-a fifth bypass duct, 505-a sixth bypass duct, 506-a seventh bypass duct.
The following detailed description of the present invention is provided in connection with the accompanying drawings and the detailed description of the invention.
Detailed Description
The cold and hot primary air in the utility model refers to cold primary air, hot primary air, cold secondary air and hot secondary air, wherein the cold primary air refers to air in the primary air intake duct 203, the hot primary air refers to air in the primary air outlet duct 204, the cold primary air is heated by the air preheater 200 to form hot primary air, the temperature of the cold primary air refers to the temperature of the air in the primary air intake duct 203 of the air preheater, and the temperature of the hot primary air refers to the temperature of the air in the primary air outlet duct 204 of the air preheater; similarly, the cold secondary air refers to air in the air preheater secondary air inlet duct 205, the hot secondary air refers to air in the air preheater secondary air outlet duct 206, the temperature of the cold secondary air refers to the temperature of air in the air preheater secondary air inlet duct 205, and the temperature of the hot secondary air refers to the temperature of air in the air preheater secondary air outlet duct 206.
The conventional boiler air heater system has large occupied area and high manufacturing cost, and condensate water cannot be recovered due to unsmooth drainage, so that the air heater cannot be put into use. Therefore, not only is the resource wasted, but also the original function cannot be achieved. The utility model discloses utilize the steam turbine condensate water heat transfer, avoided the hydrophobic problem of conventional air heater, can reach the problem of avoiding the corrosion of air heater acid dew point again safely and stably to can reduce the fan simultaneously and exert oneself. The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
Example 1
As shown in fig. 1, the embodiment discloses a system for adjusting the temperature of cold and hot air and secondary air by using condensed water to improve a fan heater, which comprises an air preheater 200, an air preheater primary air inlet pipeline 203, an air preheater primary air outlet pipeline 204, an air preheater secondary air inlet pipeline 205, an air preheater secondary air outlet pipeline 206, an air preheater primary air inlet heat exchanger 301, an air preheater primary air outlet heat exchanger 401 and a turbine condensed water system water inlet and return pipeline, wherein the air preheater primary air inlet pipeline 203, the air preheater primary air outlet pipeline 204, the air preheater secondary air inlet pipeline 205, the air preheater secondary air outlet pipeline 206.
The primary air inlet heat exchanger 301 is arranged on the primary air inlet pipeline 203 of the air preheater, and the primary air outlet heat exchanger 401 is arranged on the primary air outlet pipeline 204 of the air preheater. On the condensate side, the primary air inlet heat exchanger 301 and the primary air outlet heat exchanger 401 are connected in series. The condensed water firstly passes through the primary air inlet heat exchanger 301, then passes through the primary air outlet heat exchanger 401, and then returns to the main system of the turbine condensed water.
Furthermore, in order to control the flow rate of the condensed water in the system and achieve the purpose of adjusting the temperature of the hot and cold primary air, a first bypass pipeline 500 is arranged on the steam turbine condensed water incoming water and return water main pipeline in the embodiment. First bypass pipeline 500 does the utility model discloses the total bypass of system's condensate water can adjust the total condensate water volume that gets into this embodiment system, if when the system broke down, can draw the condensate water system back from first bypass pipeline 500 with the condensate water of full flow. The condensed water side of the air preheater primary air inlet heat exchanger 301 is provided with a bypass, i.e. a second bypass pipe 501. The second bypass duct 501 may regulate the flow of condensed water entering the primary air inlet heat exchanger 301, thereby regulating the temperature of the primary cold air entering the air preheater 200; the condensate side of the primary air outlet heat exchanger 401 is provided with a bypass, i.e. a third bypass pipe 502. The third bypass duct 502 may regulate the flow of condensed water into the primary air outlet heat exchanger 401, thereby regulating the temperature of the secondary hot air after the air preheater 200.
The method for adjusting the temperature of the cold-hot secondary air by utilizing the condensed water improved air heater comprises the following steps:
flue gas generated by combustion in the boiler 100 transfers heat to primary cold air through the air preheater 200, condensed water containing certain heat from a turbine condensed water system firstly passes through the primary air inlet heat exchanger 301, transfers the heat to the cold air in the primary air inlet pipeline 203 of the air preheater, the cooled condensed water absorbs the heat of the hot air in the primary air outlet pipeline 204 of the air preheater through the primary air outlet heat exchanger 401 of the air preheater, and finally the heated condensed water returns to the turbine condensed water system.
The temperature of the inlet primary cool air and the temperature of the outlet primary hot air of the air preheater 200 are adjusted by adding the above-mentioned bypass ducts.
Example 2
As shown in fig. 2, the present embodiment discloses a system for adjusting the temperature of cold-hot secondary air by using condensed water to improve a fan heater, and the system of the present embodiment is different from embodiment 1 in that: the flow direction of the condensed water is opposite, namely the condensed water firstly passes through the primary air outlet heat exchanger 401, then passes through the primary air inlet heat exchanger 301 and then returns to the main system of the turbine condensed water.
Furthermore, the system is provided with three bypass pipelines which are the same as those in the embodiment 1, so that the purposes of controlling the flow of condensed water in the system and adjusting the temperature of the cold and hot primary air are achieved.
The method for adjusting the temperature of the cold-hot secondary air by using the condensate water improved air heater in the embodiment is similar to that in embodiment 1, and only the flow direction of the condensate water is different.
Example 3
As shown in fig. 3, the present embodiment discloses a system for adjusting the temperature of cold and hot air and secondary air by using condensed water in an improved air heater, which comprises an air preheater 200, an air preheater primary air inlet pipeline 203, an air preheater primary air outlet pipeline 204, an air preheater secondary air inlet pipeline 205, an air preheater secondary air outlet pipeline 206, an air preheater secondary air inlet heat exchanger 302, an air preheater secondary air outlet heat exchanger 402 and a turbine condensed water system, wherein the air preheater primary air inlet pipeline 203, the air preheater primary air outlet pipeline 204, the air preheater secondary air inlet pipeline 205, the air preheater secondary air outlet.
The air preheater secondary air inlet heat exchanger 302 is disposed on the air preheater secondary air intake duct 205 and the air preheater secondary air outlet heat exchanger 402 is disposed on the air preheater secondary air outlet duct 206. On the condensate side, the air preheater secondary air inlet heat exchanger 302 and the air preheater secondary air outlet heat exchanger 402 are connected in series, and condensate firstly passes through the secondary air inlet heat exchanger 302 and then passes through the secondary air outlet heat exchanger 402.
Furthermore, in order to control the flow rate of the condensed water in the system and achieve the purpose of adjusting the temperature of the cold and hot secondary air, the first bypass pipeline 500 is disposed on the steam turbine condensed water supply and return main pipeline in this embodiment. The first bypass line 500 allows adjustment of the total amount of condensate entering the heat exchange system, and allows full flow of condensate to be directed back to the condensate system from the first bypass line 500 if the heat exchange system fails. The condensate side of the air preheater overfire air inlet heat exchanger 302 is bypassed, i.e., a fourth bypass line 503. The fourth bypass line 503 may regulate the flow of condensed water into the air preheater overfire air inlet heat exchanger 302, thereby regulating the temperature of the overfire air entering the air preheater 200. A bypass, i.e., a fifth bypass pipeline 504, is arranged on the condensate side of the air preheater secondary air outlet heat exchanger 402, and the fifth bypass pipeline 504 can adjust the flow of condensate entering the air preheater secondary air inlet heat exchanger 402, thereby adjusting the temperature of the next hot air of the air preheater 200.
The method for adjusting the temperature of the cold-hot secondary air by utilizing the condensed water improved air heater in the embodiment comprises the following steps:
flue gas that the burning produced in boiler 100 passes through air heater 200 and gives the secondary cooling air heat transfer, and the condensate water that contains certain heat that comes from the steam turbine condensate system passes through air heater overgrate air inlet heat exchanger 302 earlier, gives the cold air in the air heater overgrate air inlet air pipeline 205 heat transfer, and the condensate water after the cooling absorbs the heat of hot-air in air heater overgrate air outlet pipe 206 through air heater overgrate air outlet heat exchanger 402 again, and the condensate water after the final heaies up gets back to the steam turbine condensate system.
The temperature of the inlet secondary cool air and the outlet secondary hot air of the air preheater 200 is adjusted by adding the bypass duct described above.
Example 4
As shown in fig. 4, the present embodiment discloses a system for adjusting the temperature of cold-hot secondary air by using condensed water to improve a fan heater, and the system and method of the present embodiment are different from those of embodiment 3 in that: the flow direction of the condensed water is opposite, namely the condensed water firstly passes through the secondary air outlet heat exchanger 402, then passes through the secondary air inlet heat exchanger 302 and then returns to the main system of the turbine condensed water.
Furthermore, the system is provided with three bypass pipelines which are the same as those in the embodiment 3, so that the purposes of controlling the flow of the condensed water in the system and adjusting the temperature of the cold and hot primary air are achieved.
The method for adjusting the temperature of the cold-hot secondary air by using the condensate water improved air heater in the embodiment is similar to that in embodiment 3, and only the flow direction of the condensate water is different.
Example 5
As shown in fig. 5, the present embodiment discloses a system for adjusting the temperature of cold and hot air and secondary air by using condensed water in an improved air heater, the system is a combination of the system of embodiment 1 and the system of embodiment 3, the system and method of the present embodiment includes an air preheater 200, an air preheater primary air inlet duct 203, an air preheater primary air outlet duct 204, an air preheater secondary air inlet duct 205, an air preheater secondary air outlet duct 206, an air preheater primary air inlet heat exchanger 301, an air preheater secondary air inlet heat exchanger 302, an air preheater primary air outlet heat exchanger 401, an air preheater secondary air outlet heat exchanger 402, and a turbine condensed water system, which are disposed on the air preheater 200.
Air heater primary air inlet heat exchanger 301 sets up on air heater primary air inlet pipe 203, and air heater primary air outlet heat exchanger 401 sets up on air heater primary air-out pipeline 204, and air heater overgrate air inlet heat exchanger 302 sets up on overgrate air inlet pipe 205, and air heater overgrate air outlet heat exchanger 402 sets up on air heater overgrate air-out pipeline 206. On the condensate side, an air preheater secondary air inlet heat exchanger 302, an air preheater primary air inlet heat exchanger 301, an air preheater primary air outlet heat exchanger 401 and an air preheater secondary air outlet heat exchanger 402 are connected in series. The condensed water sequentially passes through the air preheater secondary air inlet heat exchanger 302, the air preheater primary air inlet heat exchanger 301, the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402, and finally returns to the steam turbine condensed water main system.
Furthermore, in order to control the flow of the condensed water in the system and achieve the purpose of adjusting the temperature of the cold and hot secondary air, a first bypass pipeline 500 is arranged on the condensed water incoming and return main pipeline of the steam turbine in the embodiment; a bypass, namely a second bypass pipeline 501, is arranged at the condensed water side of the air preheater primary air inlet heat exchanger 301; a bypass, namely a fourth bypass pipeline 503, is arranged at the condensed water side of the air preheater secondary air inlet heat exchanger 302; a bypass, namely a third bypass pipeline 502, is arranged at the condensed water side of the primary air outlet heat exchanger 401; the condensate side of the air preheater secondary air outlet heat exchanger 402 is provided with a bypass, fifth bypass conduit 504. The functions of the first bypass duct 500, the second bypass duct 501, the third bypass duct 502, the fourth bypass duct 503 and the fifth bypass duct 504 are described in the system and method in embodiment 1 and embodiment 3, respectively.
One end of the sixth bypass pipeline 505 is connected to the condensed water inlet pipeline of the air preheater secondary air inlet heat exchanger 302, and the other end is connected to the condensed water outlet pipeline of the air preheater primary air inlet heat exchanger 301. The sixth bypass duct 505 may regulate the total flow of condensed water into the air preheater primary air inlet heat exchanger 301 and the air preheater secondary air inlet heat exchanger 302, thereby regulating the temperature of the primary and secondary heated air after the air preheater 200.
One end of the seventh bypass pipeline 506 is connected to a condensed water inlet pipeline of the air preheater primary air outlet heat exchanger 401, the other end of the seventh bypass pipeline is connected to a condensed water outlet pipeline of the air preheater secondary air outlet heat exchanger 402, and the seventh bypass pipeline 506 can adjust the total flow of condensed water entering the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402, so as to adjust the temperature of primary cold air before entering the air preheater 200.
The method for adjusting the temperature of the cold-hot secondary air by utilizing the condensed water improved air heater in the embodiment comprises the following steps:
condensed water containing certain heat from a turbine condensed water system passes through the air preheater secondary air inlet heat exchanger 302 and the air preheater primary air inlet heat exchanger 301 in sequence, heat is transferred to cold air in the air preheater secondary air inlet pipeline 205 and the primary air inlet pipeline 203, the cooled condensed water passes through the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402 in sequence, heat of hot air in the air preheater primary air outlet pipeline 204 and the air preheater secondary air outlet pipeline 206 is absorbed, and finally the heated condensed water returns to the turbine condensed water system.
The temperature of the inlet secondary cool air and the outlet secondary hot air of the air preheater 200 is adjusted by adding the bypass duct described in this embodiment.
Example 6
As shown in fig. 6, the embodiment discloses a system for regulating the temperature of cold and hot secondary air by using condensed water to improve a fan heater, and the system and the method of the embodiment are different from those of the embodiment 5 in that: the condensed water sequentially passes through the air preheater secondary air outlet heat exchanger 402, the air preheater primary air outlet heat exchanger 401, the air preheater primary air inlet heat exchanger 301 and the air preheater secondary air inlet heat exchanger 302 and finally returns to the steam turbine condensed water main system.
Furthermore, seven bypass pipelines which are the same as those in the embodiment 6 are arranged in the system, so that the purposes of controlling the flow of the condensed water in the system and adjusting the temperature of the cold-hot secondary air are achieved.
The method for adjusting the temperature of the cold-hot secondary air by using the condensate water improved air heater in the embodiment is similar to that in embodiment 5, and only the flow direction of the condensate water is different.
Example 7
As shown in fig. 7, the present embodiment discloses a system for regulating the temperature of cold and hot secondary air by using a condensate water improved heater, which is different from the system and method of embodiment 5 in that: the condensed water side, the air inlet heat exchanger and the air outlet heat exchanger are connected in different modes. The method specifically comprises the following steps: on the condensate side, a branch formed by connecting the air preheater primary air inlet heat exchanger 301 and the air preheater secondary air inlet heat exchanger 302 in parallel is connected in series with a branch formed by connecting the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402 in parallel. The water from the steam turbine condensate system firstly passes through a parallel system formed by an air preheater primary air inlet heat exchanger 301 and an air preheater secondary air inlet heat exchanger 302, then is converged, then passes through a parallel system formed by an air preheater primary air outlet heat exchanger 401 and an air preheater secondary air outlet heat exchanger 402, and finally is converged and then returns to the steam turbine condensate system.
Furthermore, in order to control the flow rate of the condensed water in the system and achieve the purpose of adjusting the temperature of the cold and hot secondary air, the system and the method of the embodiment are provided with seven bypass pipelines which are the same as those in the embodiment 5.
The method for adjusting the temperature of the cold-hot secondary air by utilizing the condensed water improved air heater in the embodiment comprises the following steps:
the condensed water containing certain heat from the turbine condensed water system is divided into two paths which pass through the air preheater primary air inlet heat exchanger 301 and the air preheater secondary air inlet heat exchanger 302 in a parallel mode, the heat is transferred to the cold air in the air preheater primary air inlet pipeline 203 and the secondary air inlet pipeline 205, the condensed water after temperature reduction is divided into two paths after being converged, the two paths pass through the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402 in a parallel mode, the heat of the hot air in the air preheater primary air outlet pipeline 204 and the air preheater secondary air outlet pipeline 206 is absorbed, and finally the condensed water after temperature rise returns to the turbine condensed water system.
The temperature of the primary and secondary cool air at the inlet of the air preheater 200 and the temperature of the secondary hot air at the outlet of the air preheater 200 are adjusted by adding the bypass ducts described in this embodiment.
Example 8
As shown in fig. 8, the present embodiment discloses a system for regulating the temperature of cold and hot secondary air by using a condensate water improved heater, which is different from the system and method of embodiment 7 in that: the flow direction of the condensed water is opposite, namely the condensed water side, the water from the turbine condensed water system firstly passes through a parallel system formed by the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402, then is converged, then passes through a parallel system formed by the air preheater primary air inlet heat exchanger 301 and the air preheater secondary air inlet heat exchanger 302, and finally is converged and then returns to the turbine condensed water system.
Furthermore, seven bypass pipelines similar to those in embodiment 7 are arranged in the system, so that the purposes of controlling the flow of condensed water in the system and adjusting the temperature of the cold-hot secondary air are achieved.
The method for adjusting the temperature of the cold-hot secondary air by using the condensate water improved air heater in the embodiment is similar to that in the embodiment 7, and only the flow direction of the condensate water is different.
It should be noted that, in the system and method described in the embodiments of the present invention, the air preheater primary air inlet heat exchanger 301 and the air preheater secondary air inlet heat exchanger 302 in front of the air preheater 200, and the condensed water flowing through the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402 are connected in parallel or in series. And the following two modes are also within the protection scope of the utility model: the water sides of an air preheater primary air inlet heat exchanger 301 and an air preheater secondary air inlet heat exchanger 302 in front of the air preheater 200 are connected in series, and the water sides of an air preheater primary air outlet heat exchanger 401 and an air preheater secondary air outlet heat exchanger 402 behind the air preheater are connected in parallel; or the water sides of the air preheater primary air inlet heat exchanger 301 and the air preheater secondary air inlet heat exchanger 302 before the air preheater 200 are connected in parallel, and the water sides of the air preheater primary air outlet heat exchanger 401 and the air preheater secondary air outlet heat exchanger 402 after the air preheater are connected in series.
Depending on the operating conditions, the condensate from the steam turbine may not enter all or part of the air preheater primary air inlet heat exchanger 301, the air preheater primary air outlet heat exchanger 401, the air preheater secondary air inlet heat exchanger 302, and the air preheater secondary air outlet heat exchanger 402, but may be returned directly to the condensate system from the first bypass conduit 500, the second bypass conduit 501, the third bypass conduit 502, the fourth bypass conduit 503, the fifth bypass conduit 504, the sixth bypass conduit 505, and the seventh bypass conduit 506.
The utility model provides an air heater primary air import heat exchanger 301, air heater primary air export heat exchanger 401, air heater overgrate air import heat exchanger 302 and air heater overgrate air export heat exchanger 402 can be direct heat transfer (including following current, any pattern such as adverse current, mixed flow), indirect heat transfer (including any medium), also can be other any modes that satisfy this system requirement.
The utility model discloses the system can pass through air heater primary air import heat exchanger 301, air heater primary air export heat exchanger 401 with whole primary air (or overgrate air), perhaps partial primary air (or overgrate air) passes through air heater overgrate air import heat exchanger 302 and air heater overgrate air export heat exchanger 402.
The utility model discloses the relative distance of the locating position of heat exchanger in the system, with air heater is adjustable according to different site conditions and equipment performance.
The systems and methods described in accordance with the figures transfer heat between the primary hot and cold air flows, between the secondary hot and cold air flows, between the primary hot air flow and the secondary cold air flow, or between the primary hot air flow and the primary cold air flow. Are all protected by the utility model.
The various features described in the foregoing detailed description can be combined in any suitable manner without departing from the spirit of the invention, and should also be construed as disclosed in the invention.
Claims (8)
1. A system for improving a heater by utilizing condensed water to adjust the temperature of cold and hot primary and secondary air comprises an air preheater (200), an air preheater primary air inlet pipeline (203), an air preheater primary air outlet pipeline (204), an air preheater secondary air inlet pipeline (205) and an air preheater secondary air outlet pipeline (206) which are arranged on the air preheater (200), and is characterized in that,
the system also comprises an air inlet heat exchanger, an air outlet heat exchanger and a turbine condensate system, wherein the air inlet heat exchanger is arranged on a primary air inlet pipeline (203) or a secondary air inlet pipeline (205) of the air preheater; the air outlet heat exchanger is arranged on a primary air outlet pipeline (204) or a secondary air outlet pipeline (206) of the air preheater; on one side of the condensate system, the air inlet heat exchanger and the air outlet heat exchanger are connected in parallel or in series.
2. The system for improving a temperature of a hot or cold secondary air conditioner using condensed water as claimed in claim 1, wherein on the flue gas side, said inlet air heat exchanger comprises an air preheater primary air inlet heat exchanger (301) and said outlet air heat exchanger comprises an air preheater primary air outlet heat exchanger (401); the air preheater primary air inlet heat exchanger (301) is arranged on an air preheater primary air inlet pipeline (203), and the air preheater primary air outlet heat exchanger (401) is arranged on an air preheater primary air outlet pipeline (204); on the side of a condensate system, a primary air inlet heat exchanger (301) of the air preheater is connected with a primary air outlet heat exchanger (401) of the air preheater in a serial connection mode.
3. The system for improving a temperature of a hot and cold secondary air conditioner using condensed water as set forth in claim 2, wherein a first bypass pipe (500) is provided on a condensate supply and return water main pipe of the turbine; a condensed water inlet and a condensed water outlet of the primary air inlet heat exchanger (301) of the air preheater are provided with second bypass pipelines (501); and a third bypass pipeline (502) is arranged at a condensed water inlet and a condensed water outlet of the primary air outlet heat exchanger (401) of the air preheater.
4. The system for improving a temperature of a hot and cold air-secondary air conditioner by a heater using condensed water as claimed in claim 1, wherein, on the flue gas side, the inlet air heat exchanger includes an air preheater secondary air inlet heat exchanger (302), and the outlet air heat exchanger includes an air preheater secondary air outlet heat exchanger (402), wherein the air preheater secondary air inlet heat exchanger (302) is disposed on an air preheater secondary air inlet duct (205), the air preheater secondary air outlet heat exchanger (402) is disposed on an air preheater secondary air outlet duct (206), and the air preheater secondary air inlet heat exchanger (302) and the secondary air outlet heat exchanger (402) are connected in series on the condensed water side.
5. The system for improving a temperature of a hot and cold secondary air conditioner using condensed water as set forth in claim 4, wherein the turbine condensed water supply and return water main line is provided with a first bypass pipe (500); a fourth bypass pipeline (503) is arranged at a condensed water inlet and a condensed water outlet of the air preheater secondary air inlet heat exchanger (302); and a fifth bypass pipeline (504) is arranged at a condensed water inlet and a condensed water outlet of the secondary air outlet heat exchanger (402) of the air preheater.
6. The system for improving the temperature of a warm air blower to adjust the temperature of cold and hot secondary air using condensed water as claimed in claim 1, it is characterized in that on the smoke side, the air inlet heat exchanger comprises an air preheater primary air inlet heat exchanger (301) and an air preheater secondary air inlet heat exchanger (302), the air outlet heat exchanger comprises an air preheater primary air outlet heat exchanger (401) and an air preheater secondary air outlet heat exchanger (402), the air preheater primary air inlet heat exchanger (301) is arranged on an air preheater primary air inlet pipeline (203), the air preheater primary air outlet heat exchanger (401) is arranged on an air preheater primary air outlet pipeline (204), the air preheater secondary air inlet heat exchanger (302) is arranged on an air preheater secondary air inlet pipeline (205), and the air preheater secondary air outlet heat exchanger (402) is arranged on an air preheater secondary air outlet pipeline (206); on the side of a condensate system, an air preheater primary air inlet heat exchanger (301), an air preheater primary air outlet heat exchanger (401), an air preheater secondary air inlet heat exchanger (302) and an air preheater secondary air outlet heat exchanger (402) are connected in series on a water inlet pipeline of the condensate system of the steam turbine.
7. The system for improving the temperature of a warm air blower to adjust the temperature of cold and hot secondary air using condensed water as claimed in claim 1, it is characterized in that on the smoke side, the air inlet heat exchanger comprises an air preheater primary air inlet heat exchanger (301) and an air preheater secondary air inlet heat exchanger (302), the air outlet heat exchanger comprises an air preheater primary air outlet heat exchanger (401) and an air preheater secondary air outlet heat exchanger (402), the air preheater primary air inlet heat exchanger (301) is arranged on an air preheater primary air inlet pipeline (203), the air preheater primary air outlet heat exchanger (401) is arranged on an air preheater primary air outlet pipeline (204), the air preheater secondary air inlet heat exchanger (302) is arranged on an air preheater secondary air inlet pipeline (205), and the air preheater secondary air outlet heat exchanger (402) is arranged on an air preheater secondary air outlet pipeline (206); on the side of a condensate system, a branch formed by connecting an air preheater primary air inlet heat exchanger (301) and an air preheater primary air outlet heat exchanger (401) in series or in parallel and a branch formed by connecting an air preheater secondary air inlet heat exchanger (302) and an air preheater secondary air outlet heat exchanger (402) in series or in parallel are connected in parallel on a water supply and return pipeline of a turbine condensate system.
8. The system for improving the temperature of a hot and cold secondary air conditioner by using condensed water as claimed in claim 6 or 7, wherein a first bypass pipe (500) is provided on the main supply and return pipes of the condensed water of the turbine; a condensed water inlet and a condensed water outlet of the primary air inlet heat exchanger (301) of the air preheater are provided with second bypass pipelines (501); a third bypass pipeline (502) is arranged at a condensed water inlet and a condensed water outlet of the primary air outlet heat exchanger (401) of the air preheater; a fourth bypass pipeline (503) is arranged at a condensed water inlet and a condensed water outlet of the air preheater secondary air inlet heat exchanger (302); a fifth bypass pipeline (504) is arranged at a condensed water inlet and a condensed water outlet of the secondary air outlet heat exchanger (402) of the air preheater; the sixth bypass pipeline (505) is arranged between a condensed water inlet of the air preheater primary air inlet heat exchanger (301) and a condensed water outlet of the air preheater secondary air inlet heat exchanger (302); and a seventh bypass pipeline (506) is arranged between a condensed water inlet of the air preheater primary air outlet heat exchanger (401) and a condensed water outlet of the air preheater secondary air outlet heat exchanger (402).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921221720.5U CN211011462U (en) | 2019-07-31 | 2019-07-31 | System for utilize condensate water to improve air heater and adjust cold and hot overgrate air temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921221720.5U CN211011462U (en) | 2019-07-31 | 2019-07-31 | System for utilize condensate water to improve air heater and adjust cold and hot overgrate air temperature |
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| Publication Number | Publication Date |
|---|---|
| CN211011462U true CN211011462U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921221720.5U Active CN211011462U (en) | 2019-07-31 | 2019-07-31 | System for utilize condensate water to improve air heater and adjust cold and hot overgrate air temperature |
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| CN (1) | CN211011462U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578931A (en) * | 2019-07-31 | 2019-12-17 | 西安航天源动力工程有限公司 | System and method for adjusting temperature of primary air and secondary air by utilizing condensed water to improve air heater |
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2019
- 2019-07-31 CN CN201921221720.5U patent/CN211011462U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578931A (en) * | 2019-07-31 | 2019-12-17 | 西安航天源动力工程有限公司 | System and method for adjusting temperature of primary air and secondary air by utilizing condensed water to improve air heater |
| CN110578931B (en) * | 2019-07-31 | 2024-08-02 | 西安航天源动力工程有限公司 | System and method for adjusting secondary air temperature by utilizing condensation water to improve heater |
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