CN202452865U - Distributed control and phase change type heat exchange system based on classification heat exchange - Google Patents
Distributed control and phase change type heat exchange system based on classification heat exchange Download PDFInfo
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- CN202452865U CN202452865U CN2011204038546U CN201120403854U CN202452865U CN 202452865 U CN202452865 U CN 202452865U CN 2011204038546 U CN2011204038546 U CN 2011204038546U CN 201120403854 U CN201120403854 U CN 201120403854U CN 202452865 U CN202452865 U CN 202452865U
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Abstract
The utility model relates to a distributed control and phase change type heat exchange system based on classification heat exchange. The distributed control and phase change type heat exchange system comprises a cold source heat exchanger, a heat source heat exchanger, a vapor-liquid heat exchanger and a liquid storage box, wherein the upper collecting box of the cold source heat exchanger is communicated with the vapor-liquid heat exchanger through the steam outlet pipe of the vapor-liquid heat exchanger; the lower collecting box of the old source heat exchanger and the lower liquid side of the liquid storage box are communicated with the vapor-liquid heat exchanger through condensate pipes, and the upper steam side of the liquid storage box is communicated with the upper collecting box of the cold source heat exchanger; and the heat source heat exchanger comprises a low temperature type heat source exchanger and a high temperature type heat source exchanger which are arranged in series, the steam side communicating pipes of the low temperature type heat source exchanger and the high temperature type heat source exchanger are combined into a steam pipe to be communicated with the steam side steam inlet of the vapour-liquid heat exchanger, the liquid side outlet of the vapor-liquid heat exchanger is communicated with the upper collecting box of the high temperature type heat source exchanger through the liquid outlet pipe of the vapor-liquid heat exchanger and is communicated with the upper liquid side of the liquid storage box through an overflow pipe after passing through the high temperature type heat source exchanger and the low temperature type heat source exchanger. The distributed control and phase change type heat exchange system has better effect.
Description
Technical field
The utility model relates to the controlled augmentation of heat transfer technical field of safety, and particularly, the utility model relates to a kind of branch control phase-change heat-exchange system based on the classification heat exchange.
Background technology
At home and abroad augmentation of heat transfer technology and being exclusively used in the technology of heat recovery utilizes gas to condense and liquid boiling evaporation heat transfer coefficient height and the uniform characteristics of temperature, develops many efficient phase-change heat-exchanges technology.
Divide the control phase change technique to be divided into independently unit and various process, control the phase transition parameter of different units as required respectively, thereby make the adaptability of phase-change heat-exchange and economy be greatly improved through the phase-change heat-exchange process that tradition is unified.Divide control phase-change heat-exchange system to develop different system schemas, to obtain best effect according to different service conditions.
For thermal source heat exchanger afterbody heat-transfer surface, the exhaust gas temperature that reclaims flue gas is lower, and often near the acid dew point of flue gas, thereby the control of heat exchanging wall temperature requirement is higher; At application number is 201110177569.1; Theme as in the patent of " a kind of branch control phase-change heat-exchange system and heat-exchange method " based on the two-stage vapour-liquid heat exchanger; Disclose a kind of method that has realized dividing the control phase transformation, solved the problem that condensate liquid is crossed cold and steam superheating preferably.But when system controls the condensate liquid degree of supercooling in this utility model, the steam heat-exchanging that mainly leans on condensate liquid and thermal source heat exchanger to produce, when thermal source heat exchange load hanged down, the quantity of steam of generation is not enough, and was just limited to the control of degree of supercooling; In addition, the supercooled liquid of system and steam heat-exchanging are before booster before, and when underload, the evaporated liquor of relatively hot source heat exchanger still has degree of supercooling; Have the condensate liquid of degree of supercooling directly to get into the final stage heating surface of the lower thermal source heat exchanger of outside flue-gas temperature, the probability of final stage heating surface generation cold end corrosion increases; Water level meter and flow control valve have been adopted in thermal source heat exchanger water level control, and system is complicacy comparatively, and the flow control valve when closing booster be easy to take place cavitation; The thermal source heat exchanger heat exchange control parameters of inner loop working medium that adopt are controlled the heat exchanger wall temperature more; Operating mode for heat flux is smaller or more stable is better; Wall temperature control is also more stable, but changes operating mode greatly for heat flux, and the wall temperature fluctuation range is also bigger; Thereby outside the optimum range of setting of just possibly being everlasting by the accent fluid properties, influence the Best Economy and the security of system.
The utility model content
The purpose of the utility model is in order to overcome the problems referred to above, and a kind of branch control phase-change heat-exchange system based on the classification heat exchange is provided.
To achieve these goals; The branch control phase-change heat-exchange system based on the classification heat exchange that the utility model provides comprises low-temperature receiver heat exchanger 11, thermal source heat exchanger, vapour-liquid heat exchanger 21 and fluid storage tank 14; Wherein, the upper collecting chamber of low-temperature receiver heat exchanger 11 is connected with vapour-liquid heat exchanger 21 through vapour-liquid heat exchanger steam outlet pipe 10; The bottom liquid side of the next part case of low-temperature receiver heat exchanger 11 and fluid storage tank 14 is connected with vapour-liquid heat exchanger 21 through condensate line 16 respectively; The top vapour side of fluid storage tank 14 is connected with the upper collecting chamber of low-temperature receiver heat exchanger 11, and condensate line 16 is provided with condensate temperature sensor 15, and said thermal source heat exchanger is provided with temperature sensor;
Said thermal source heat exchanger comprises the low temperature level thermal source heat exchanger 4 and high temperature level thermal source heat exchanger 25 that series connection is provided with, and the steam pipe 9 of merging into vapour side communicating pipe on said low temperature level thermal source heat exchanger 4 and the high temperature level thermal source heat exchanger 25 is connected with the vapour side air intake of vapour-liquid heat exchanger 21;
The liquid side outlet of said vapour-liquid heat exchanger 21 is connected through the upper collecting chamber of vapour-liquid heat exchanger drain pipe 23 with high temperature level thermal source heat exchanger 25, and behind high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4, is communicated with the top vapour side of fluid storage tank 14 through overflow pipe 3;
One or more levels liquid seal device 26 is set on the said overflow pipe 3, and the thermal source heat exchanger and the low-temperature receiver heat exchanger that are used for different phase transition parameters are isolated;
On the described steam pipe 9 steam flow control valve 8 is set, is used for the flow of steam in the steam regulation pipe 9, said steam flow control valve 8 links with 7 communications of steam flow control valve controller.A kind of improvement as such scheme; The upper collecting chamber of said low temperature level thermal source heat exchanger 4 is communicated with through vapour side communicating pipe with the upper collecting chamber of high temperature level thermal source heat exchanger 25, and the next part case of low temperature level thermal source heat exchanger 4 is communicated with through liquid side communicating pipe 5 with the next part case of high temperature level thermal source heat exchanger 25;
Perhaps, the next part case with high temperature level thermal source heat exchanger 25 is communicated with the upper collecting chamber of said low temperature level thermal source heat exchanger 4 through liquid side communicating pipe 5;
Perhaps, the next part case of low temperature level thermal source heat exchanger 4 through liquid side communicating pipe 5 and high temperature level thermal source heat exchanger 25 upper collecting chamber be communicated with.
As another improvement of such scheme, storage liquid container 1 is set between said low temperature level thermal source heat exchanger 4 and the overflow pipe 3, the vapour side and the liquid side of storage liquid container 1 are communicated with the upper collecting chamber and the next part case of low temperature level thermal source heat exchanger 4 respectively.
Said overflow pipe 3 or storage liquid container 1 are provided with the spilling water adjusting device, are used to regulate the water level in the thermal source heat exchanger, make the evaporative phase-change heat exchange efficiency reach optimum state.
As another improvement of such scheme, the air intake of said vapour-liquid heat exchanger 21 vapour sides is provided with steam-out (SO) pipe 20), steam-out (SO) pipe 20 is provided with external steam flow control valve 19; Said external steam flow control valve 19 is connected by communication with steam flow control valve 8 with external steam flow control valve controller 18.
As another improvement of such scheme, said vapour-liquid heat exchanger steam outlet pipe 10 near low-temperature receiver heat exchanger 11 is provided with low-temperature receiver heat exchanger pressure sensor 12, is used to measure the inner gas pressure of low-temperature receiver heat exchanger,
Be connected and installed thermal source heat exchanger pressure sensor 6 on the steam pipe 9 before the said steam flow control valve 8, be used to measure the inner gas pressure of reflect heat source heat exchanger;
The heat exchanger outer wall of said low temperature level thermal source heat exchanger 4 is provided with thermal source heat exchanger wall temperature sensor 2, is used to measure low temperature level thermal source heat exchanger outside wall temperature;
Said vapour-liquid heat exchanger drain pipe 23 is provided with vapour-liquid heat exchanger fluid temperature sensor 22, is used to measure vapour-liquid heat exchanger and goes out liquid temp;
Condensate line 16 between said fluid storage tank 14 and the vapour-liquid heat exchanger 21 is provided with booster 17; Condensate line 16 between said low-temperature receiver heat exchanger 11 and the booster 17 is provided with condensate temperature sensor 15, is used to measure the temperature that low-temperature receiver heat exchanger 11 flows out condensate liquid;
Low-temperature receiver heat exchanger exhaust-valve is set on the upper collecting chamber of said low-temperature receiver heat exchanger 11, is used for the incondensable gas that the discharge system accumulates;
On the condensate line 16 in said booster 17 exits discharging tube is set, is used for liquid discharge system in the system;
Said vapour-liquid heat exchanger steam outlet pipe 10 can connect one road steam pipe and be communicated with the lower collecting box of low-temperature receiver heat exchanger 11; Can make steam get into low-temperature receiver heat exchanger 11 from the lower collecting box of low-temperature receiver heat exchanger 11, this more helps reducing the degree of supercooling of condensate liquid and the on-condensible gas in the emptying low-temperature receiver heat exchanger 11.
As also a kind of improvement of such scheme, one or more levels liquid seal device 26 is set on the said overflow pipe 3, the thermal source heat exchanger and the low-temperature receiver heat exchanger that are used for different phase transition parameters are isolated;
Said overflow pipe 3 or storage liquid container 1 are provided with the spilling water adjusting device, are used to regulate the water level in the thermal source heat exchanger, make the evaporative phase-change heat exchange efficiency reach optimum state.
The utility model also provides a kind of heat-exchange method of branch control phase-change heat-exchange system of classification heat exchange, said method comprising the steps of:
1) flow through successively high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4 outer surfaces of heat source fluid 24; With its inner evaporated liquor of heat transferred; Make evaporated liquor be evaporated to steam; Said steam is flowed through to gather vapour side communicating pipe by the upper collecting chamber of high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4 respectively and is entered into steam pipe 9; Said steam gets into vapour-liquid heat exchangers 21 through steam flow control valve 8, with the condensed heat transfer fluid of the vapour-liquid heat exchanger 21 of flowing through, with part heat transferred condensate liquid after vapour-liquid heat exchanger steam outlet pipe 10 gets into low-temperature receiver heat exchangers 11; With the flow through low-temperature receiver fluid 13 of low-temperature receiver heat exchanger 11 outer surfaces of heat transferred, said steam is condensed into condensate liquid through low-temperature receiver heat exchanger 11 steam;
2) the condense condensate liquid that obtains and the condensate liquid in the fluid storage tank 14 of the steam described in the step 1) gets into vapour-liquid heat exchangers 21 and the steam heat-exchanging of flowing through through condensate line 16; Reduced degree of supercooling; With after vapour-liquid heat exchanger drain pipe 23 gets into high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4 successively; The part condensate liquid is evaporated to steam and gets into steam pipe 9 back performing steps 1 in high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4) described circulation, the recirculation that remaining condensate liquid gets into realization condensate liquid in the fluid storage tanks 14 through overflow pipe 3 and liquid seal device 26;
Wherein, control after the comprehensive computing of measuring-signal of said barometric damper 8 through thermal source heat exchanger wall temperature sensor 2 and thermal source heat exchanger pressure sensor 6.
A kind of improvement as such scheme; Said step 2) condensate liquid that remaining condensate liquid gets into storage liquid container 1 in high temperature level thermal source heat exchanger 25 and the low temperature level thermal source heat exchanger 4 in gets into fluid storage tanks 14 through overflow pipe 3 and liquid seal device 26, gets back to condensate line 16 then and circulates once more.
Another improvement as such scheme; Said barometric damper 8 is controlled aperture by gas flow modulation valve control 7, and gas flow modulation valve control 7 was implemented control afterwards according to the measuring-signal computing of thermal source heat exchanger wall temperature sensor 2 and thermal source heat exchanger pressure sensor 6;
When the temperature of thermal source heat exchanger wall temperature sensor 2 measurements and the setting value generation deviation of gas flow modulation valve control; Then the gas flow modulation valve control carries out computing according to this deviation; Calculate the opening value of the adjusting barometric damper that is used to correct this operation deviation accordingly; The gas flow modulation valve control is according to the rate of change of the measured value of the thermal source heat exchanger pressure sensor 6 of differentiating simultaneously; Calculate the opening value of corresponding adjusting barometric damper,, finally regulated the output controlling value of gas flow modulation valve opening above-mentioned two value summations; This controlling value is used for correction of deviation, and measured value and setting value are consistent; The desired temperature of thermal source heat exchanger wall temperature sensor 2 is higher than 2～30 ℃ of thermal source flue gas acid dew points;
The rate of change of the measured value of the thermal source heat exchanger pressure sensor 6 of differentiating through the gas flow modulation valve control; Send the instruction of regulating the gas flow modulation valve opening; To improve the speed of phase-change heat-exchange parameter in the control thermal source heat exchanger; The heat-transfer surface wall temperature that ensures the thermal source heat exchanger has enough safe clearances, and cold end corrosion does not take place.
As also a kind of improvement of such scheme, said external steam flow control valve 19 is controlled aperture by external steam flow control valve controller 18, and external steam flow control valve controller 18 is controlled according to vapour-liquid heat exchanger fluid temperature sensor 22 measuring-signals; Perhaps control according to the measuring-signal of condensate temperature sensor 15; Perhaps control according to the fluid temperature signal of the temperature sensor measurement of installing on liquid side communicating pipe 5;
When the temperature of measuring and the setting value generation deviation of external steam flow control valve controller 18; Then external steam flow control valve controller 18 carries out computing according to this deviation; Calculate the opening value of the external steam flow control valve 19 of adjusting that is applied to correct this operation deviation mutually; As controlling value output, the aperture of regulating external steam flow control valve 19 is consistent measured value and setting value; The desired temperature of external steam flow control valve controller 18 is higher than 1～15 ℃ of thermal source flue gas acid dew point;
The temperature that condensate temperature sensor 15 is recorded records the corresponding saturation temperature of pressure relatively with low-temperature receiver heat exchanger pressure sensor 12; If deviation surpasses setting value; To send the big alarm signal of degree of supercooling, and the on-condensible gas in the low-temperature receiver heat exchanger is in time discharged in prompting.
The advantage of the utility model is:
The utility model is provided with the heat absorption heat exchanger classification of thermal source fume side; And change conventional parallel connection setting, the heat absorption heat exchanger is set to the heat exchanger that two or more series connection are provided with, comprising high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4; Condensate liquid in the system gets into the degree of supercooling that helps reducing condensate liquid from high temperature level thermal source heat exchanger 25 vapour side spaces; Simultaneously and heat source fluid 24 heat exchanges take place, further reduce the degree of supercooling of condensate liquid, though temperature descends to some extent when heat source fluid 24 is flowed through low temperature level thermal source heat exchanger 4 then; But because it is higher to get into the condensate temperature of low temperature level thermal source heat exchanger 4; Therefore low temperature level thermal source heat exchanger 4 can not corrode yet, and therefore, in the utility model, through series connection heat exchanger is set; When making liquid near saturation temperature get into low temperature level thermal source heat exchanger again, can ensure that low temperature level thermal source heat exchanger does not receive the infringement of cold end corrosion.
The utility model is introduced external vapour source; Vapour-liquid heat exchanger 21 is placed after the booster 17; Can be at low-temperature receiver fluid 13 with heat source fluid 24 temperature during not in design load; Reduce the degree of supercooling of condensate liquid, help protecting high temperature level thermal source heat exchanger 25 not receive the infringement of cold end corrosion with respect to thermal source heat exchanger pressure.Because the preceding liquid temperature of pump is lower, the probability that cavitations take place booster 17 lowers simultaneously.In addition; The external gas origin system of the utility model can improve branch control phase transformation internal system pressure at any time; Discharge the flexibility of on-condensible gas in the increase system; When low-temperature receiver heat exchanger internal pressure was brought up to certain value, the emptying system that is provided with water seal overcame the water column pressure of water seal automatically gas is discharged system.When pressure was reduced to definite value, water seal rebulid, and avoided extraneous air to enter in the system, thereby improved the heat exchange efficiency and the equipment life of system.
The wall temperature of the utility model employing low temperature level thermal source heat exchanger 4 and internal pressure are as the composite control signal source of regulating steam flow control valve 8, and the adaptability for working condition that changes greatly for heat flux strengthens, and the Best Economy and the security of system are improved.
The utility model adopts the mode of storage liquid container 1 discharge control to control the optimal liquid level in the thermal source heat exchanger, and system is simple, stable, reliable.Fluid storage tank 14 is got back in the condensate liquid overflow, gets into booster 17 again, forms the condensate liquid recirculating system, the condensate liquid of certain circulating ratio through repeatedly with steam heat-exchanging, help reducing the degree of supercooling of condensate liquid.Recirculating system can avoid pump capacity to be lower than minimum discharge simultaneously, helps preventing the cavitation of booster 17.
The utility model passes through the temperature of vapour-liquid heat exchanger fluid temperature sensor 22 measurements etc., controls the evaporation capacity for engine in external vapour source, can adapt to the change of unit operational factor automatically, has improved the economy and the security of system.
The utility model records pressure ratio through temperature and the low-temperature receiver heat exchanger pressure sensor 12 that condensate temperature sensor 15 is recorded, and can judge the quantity of on-condensible gas in the low-temperature receiver heat exchanger, for exhaust in time improves system's heat exchange efficiency monitoring means is provided.
Description of drawings
Fig. 1 is the structural representation based on the branch control phase-change heat-exchange system of classification heat exchange of the utility model.
1, storage liquid container 2, thermal source heat exchanger wall temperature sensor 3, overflow pipe
4, low temperature level thermal source heat exchanger 5, liquid side communicating pipe 6, thermal source heat exchanger pressure sensor
7, steam flow control valve controller 8, steam flow control valve 9, steam pipe
10, vapour-liquid heat exchanger steam outlet pipe 11, low-temperature receiver heat exchanger
12, low-temperature receiver heat exchanger pressure sensor 13, low-temperature receiver fluid
14, fluid storage tank 15, condensate temperature sensor 16, condensate line
17, booster 18, external steam flow control valve controller
19, external steam flow control valve 20, steam-out (SO) pipe 21, vapour-liquid heat exchanger
22, vapour-liquid heat exchanger fluid temperature sensor 23, vapour-liquid heat exchanger drain pipe
24, heat source fluid 25, high temperature level thermal source heat exchanger 26, liquid seal device
The specific embodiment
Branch control phase-change heat-exchange system according to the classification heat exchange of the utility model; Said system comprises vapour-liquid heat exchanger 21, low temperature level thermal source heat exchanger 4, high temperature level thermal source heat exchanger 25 and low-temperature receiver heat exchanger 11; Said system also comprises steam flow control valve 8, external steam flow control valve 19, storage liquid container 1;
The upper collecting chamber of low temperature level thermal source heat exchanger 4 is communicated with through vapour side communicating pipe with the upper collecting chamber of high temperature level thermal source heat exchanger 25, the next part case of low temperature level thermal source heat exchanger 4 and high temperature level thermal source heat exchanger 25 the next part case be communicated with through liquid side communicating pipe 5; Upper collecting chamber that also can be through being communicated with liquid side communicating pipe 5 low temperature level thermal source heat exchangers 4 and high temperature level thermal source heat exchanger 25 the next part case; Perhaps next part case through being communicated with liquid side communicating pipe 5 low temperature level thermal source heat exchangers 4 and high temperature level thermal source heat exchanger 25 upper collecting chamber;
The upper collecting chamber vapour side communicating pipe of aforementioned hot source heat exchanger is connected with the vapour side air intake of vapour-liquid heat exchanger 21 through steam pipe 9, and vapour-liquid heat exchanger steam outlet pipe 10 makes the vapour side venthole of vapour-liquid heat exchanger 21 be connected with the upper collecting chamber of low-temperature receiver heat exchanger 11; Steam flow control valve 8 is installed on the steam pipe 9, and steam flow control valve 8 links with 18 communications of steam flow control valve controller;
The air intake of vapour-liquid heat exchanger 21 vapour sides is connecting steam-out (SO) pipe 20, and external steam flow control valve 19 is installed on the steam-out (SO) pipe 20; External steam flow control valve 19 links with 8 communications of steam flow control valve with external steam flow control valve controller 18;
Condensate line 16 is being communicated with the liquid side entrance of vapour-liquid heat exchanger 21 and the next part case of low-temperature receiver heat exchanger 11, and booster 17 is installed on the condensate line 16; The liquid side outlet of vapour-liquid heat exchanger 21 is connected through the upper collecting chamber of vapour-liquid heat exchanger drain pipe 23 with high temperature level thermal source heat exchanger 25;
The top vapour side of fluid storage tank 14 is connected with the upper collecting chamber of low-temperature receiver heat exchanger 11, and the bottom liquid side of fluid storage tank 14 is connected with condensate line 16 between low-temperature receiver heat exchanger 11 and the booster 17;
The top vapour side of storage liquid container 1 is communicated with the upper collecting chamber of low temperature level thermal source heat exchanger 4, and the bottom liquid side of storage liquid container 1 is communicated with the next part case of low temperature level thermal source heat exchanger 4, and the top of storage liquid container 1 links through the top vapour side of overflow pipe 3 with fluid storage tank 14; One or more levels liquid seal device 26 can be installed on overflow pipe 3, isolated with thermal source heat exchanger and the low-temperature receiver heat exchanger of guaranteeing different phase transition parameters; Through the water level in the spilling water adjusting device scalable thermal source heat exchanger is installed on overflow pipe 3 or storage liquid container 1, guarantee to make the evaporative phase-change heat exchange efficiency to reach optimum state.
Low-temperature receiver heat exchanger exhaust-valve is set on the upper collecting chamber of said low-temperature receiver heat exchanger 11, is used for the incondensable gas that the discharge system accumulates;
Be connected and installed with the thermal source heat exchanger pressure sensor 6 of measuring the inner gas pressure of reflect heat source heat exchanger on the steam pipe 9 before said steam flow control valve 8, the thermal source heat exchanger wall temperature sensor 2 of measuring thermal source heat exchanger outside wall temperature is installed on the heat exchanger outer wall of said low temperature level thermal source heat exchanger 4;
On vapour-liquid heat exchanger steam outlet pipe 10, be connected and installed with the low-temperature receiver heat exchanger pressure sensor 12 of measuring the inner gas pressure of low-temperature receiver heat exchanger, be connected and installed with the condensate temperature sensor 15 of the temperature of measuring low-temperature receiver heat exchanger 11 outflow condensate liquids at condensate line 16 near the position of low-temperature receiver heat exchanger 11 near low-temperature receiver heat exchanger 11; Condensate temperature sensor 15 also can be installed on the condensate line 16 between booster 17 and the vapour-liquid heat exchanger 21;
Be connected and installed with on the vapour-liquid heat exchanger drain pipe 23 and measure the vapour-liquid heat exchanger fluid temperature sensor 22 that vapour-liquid heat exchanger goes out liquid temp.
Vapour-liquid heat exchanger steam outlet pipe 10 can connect one road steam pipe and be communicated with the lower collecting box of low-temperature receiver heat exchanger 11; Can make steam get into low-temperature receiver heat exchanger 11 from the lower collecting box of low-temperature receiver heat exchanger 11, this more helps reducing the degree of supercooling of condensate liquid and the on-condensible gas in the emptying low-temperature receiver heat exchanger 11.
Near the position that booster 17 exports discharging tube can be set at condensate line 16, so that liquid is discharged system in the system.
After the branch control phase-change heat-exchange system of said classification heat exchange starts; Heat source fluid 24 flow through successively high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4 outer surfaces; Simultaneously with its inner evaporated liquor of heat transferred; Make evaporated liquor be evaporated to steam, this steam is flowed through to gather vapour side communicating pipe by the upper collecting chamber of high temperature level thermal source heat exchanger 25 and low temperature level thermal source heat exchanger 4 respectively and is entered into steam pipe 9;
This steam gets into vapour-liquid heat exchanger 21 through steam flow control valve 8 subsequently; Condensed heat transfer fluid with the vapour-liquid heat exchanger 21 of flowing through; With part heat transferred condensate liquid after vapour-liquid heat exchanger steam outlet pipe 10 gets into low-temperature receiver heat exchangers 11; With the flow through low-temperature receiver fluid 13 of low-temperature receiver heat exchanger 11 outer surfaces of heat transferred, be condensed into condensate liquid through low-temperature receiver heat exchanger 11 steam;
This condensate liquid gets into aforementioned vapour-liquid heat exchanger 21 and the steam heat-exchanging of flowing through after condensate line 16 and booster 17 boost; Reduced degree of supercooling; With after vapour-liquid heat exchanger drain pipe 23 gets into high temperature level thermal source heat exchangers 25; Part condensate liquid carries out next circulation in 25 evaporations of high temperature level thermal source heat exchanger; Another part condensate liquid is through getting into low temperature level thermal source heat exchanger 4 liquid side communicating pipe 5, and next circulation is carried out in the condensate liquid part evaporation that gets into low temperature level thermal source heat exchanger 4, and another part gets into storage liquid container 1;
The condensate liquid that gets into storage liquid container 1 gets into fluid storage tank 14 through overflow pipe 3 and liquid seal device 26, gets back to condensate line 16 then and circulates once more;
When external steam flow control valve 19 is opened; Steam-out (SO) gets into vapour-liquid heat exchanger 21 vapour sides through steam-out (SO) pipe 20 and external steam flow control valve 19; Then with the condensed heat transfer fluid of the vapour-liquid heat exchanger 21 of flowing through; Part heat transferred condensate liquid after vapour-liquid heat exchanger steam outlet pipe 10 gets into low-temperature receiver heat exchanger 11, is joined the internal system circulation.
The control method of the branch control phase-change heat-exchange system of the classification heat exchange of the utility model is:
Barometric damper 8 is controlled aperture by gas flow modulation valve control 7, and gas flow modulation valve control 7 was implemented control afterwards according to the comprehensive computing of measuring-signal of thermal source heat exchanger wall temperature sensor 2 and thermal source heat exchanger pressure sensor 6;
When the temperature of thermal source heat exchanger wall temperature sensor 2 measurements and the setting value generation deviation of gas flow modulation valve control; Then the gas flow modulation valve control carries out computing according to this deviation; Calculate the corresponding opening value of correcting the adjusting barometric damper of this operation deviation; The gas flow modulation valve control is according to the rate of change of the measured value of the thermal source heat exchanger pressure sensor 6 of differentiating simultaneously; Calculate the opening value of corresponding adjusting barometric damper, above-mentioned two values summation is the output controlling value of final adjusting gas flow modulation valve opening; But this controlling value correction of deviation is consistent measured value and setting value; The desired temperature of thermal source heat exchanger wall temperature sensor 2 is higher than 2～30 ℃ of thermal source flue gas acid dew points;
The rate of change of the measured value of the thermal source heat exchanger pressure sensor 6 of differentiating through the gas flow modulation valve control; Can send the instruction of regulating the gas flow modulation valve opening fast; To improve the speed of phase-change heat-exchange parameter in the control thermal source heat exchanger; The heat-transfer surface wall temperature that ensures the thermal source heat exchanger has enough safe clearances, and cold end corrosion does not take place;
External steam flow control valve 19 is controlled aperture by external steam flow control valve controller 18, and external steam flow control valve controller 18 is implemented control according to vapour-liquid heat exchanger fluid temperature sensor 22 measuring-signals;
When the temperature of vapour-liquid heat exchanger fluid temperature sensor 22 measurements and the setting value generation deviation of external steam flow control valve controller 18; Then external steam flow control valve controller 18 carries out computing according to this deviation; Calculate the corresponding opening value of correcting the external steam flow control valve 19 of adjusting of this operation deviation; As controlling value output, the aperture of regulating external steam flow control valve 19 is consistent measured value and setting value; The desired temperature of external steam flow control valve controller 18 is higher than 1～15 ℃ of thermal source flue gas acid dew point;
The temperature that condensate temperature sensor 15 is recorded records the corresponding saturation temperature of pressure relatively with low-temperature receiver heat exchanger pressure sensor 12; If deviation surpasses setting value; To send the big alarm signal of degree of supercooling, and the on-condensible gas in the low-temperature receiver heat exchanger is in time discharged in prompting.
It should be noted last that above embodiment is only unrestricted in order to the technical scheme of explanation the utility model.Although the utility model is specified with reference to embodiment; Those of ordinary skill in the art is to be understood that; The technical scheme of the utility model is made amendment or is equal to replacement; The spirit and the scope that do not break away from the utility model technical scheme, it all should be encompassed in the middle of the claim scope of the utility model.
Claims (6)
1. branch control phase-change heat-exchange system based on the classification heat exchange; Said system comprises low-temperature receiver heat exchanger (11), thermal source heat exchanger, vapour-liquid heat exchanger (21) and fluid storage tank (14); Wherein, the upper collecting chamber of low-temperature receiver heat exchanger (11) is connected with vapour-liquid heat exchanger (21) through vapour-liquid heat exchanger steam outlet pipe (10); The bottom liquid side of the next part case of low-temperature receiver heat exchanger (11) and fluid storage tank (14) is connected with vapour-liquid heat exchanger (21) through condensate line (16) respectively; The top vapour side of fluid storage tank (14) is connected with the upper collecting chamber of low-temperature receiver heat exchanger (11), and condensate line (16) is provided with condensate temperature sensor (15); Said thermal source heat exchanger is provided with temperature sensor, it is characterized in that,
Said thermal source heat exchanger comprises low temperature level thermal source heat exchanger (4) and the high temperature level thermal source heat exchanger (25) that series connection is provided with, and the steam pipe (9) of merging into vapour side communicating pipe on said low temperature level thermal source heat exchanger (4) and the high temperature level thermal source heat exchanger (25) is connected with the vapour side air intake of vapour-liquid heat exchanger (21);
The liquid side outlet of said vapour-liquid heat exchanger (21) is connected through the upper collecting chamber of vapour-liquid heat exchanger drain pipe (23) with high temperature level thermal source heat exchanger (25), and behind high temperature level thermal source heat exchanger (25) and low temperature level thermal source heat exchanger (4), is communicated with the top vapour side of fluid storage tank (14) through overflow pipe (3);
Steam flow control valve (8) is set on the described steam pipe (9), is used for the flow of the interior steam of steam regulation pipe (9), said steam flow control valve (8) links with steam flow control valve controller (7) communication.
2. the branch control phase-change heat-exchange system based on the classification heat exchange according to claim 1 is characterized in that,
The upper collecting chamber of said low temperature level thermal source heat exchanger (4) is communicated with through vapour side communicating pipe with the upper collecting chamber of high temperature level thermal source heat exchanger (25), and the next part case of low temperature level thermal source heat exchanger (4) is communicated with through liquid side communicating pipe (5) with the next part case of high temperature level thermal source heat exchanger (25);
Perhaps,
Next part case with high temperature level thermal source heat exchanger (25) is communicated with the upper collecting chamber of said low temperature level thermal source heat exchanger (4) through liquid side communicating pipe (5);
Perhaps,
The next part case of said low temperature level thermal source heat exchanger (4) through liquid side communicating pipe (5) and high temperature level thermal source heat exchanger (25) upper collecting chamber be communicated with.
3. the branch control phase-change heat-exchange system based on the classification heat exchange according to claim 1; It is characterized in that; Storage liquid container (1) is set between said low temperature level thermal source heat exchanger (4) and the overflow pipe (3), and the vapour side and the liquid side of storage liquid container (1) are communicated with the upper collecting chamber and the next part case of low temperature level thermal source heat exchanger (4) respectively.
4. the branch control phase-change heat-exchange system based on the classification heat exchange according to claim 1 is characterized in that,
One or more levels liquid seal device (26) is set on the said overflow pipe (3), and the thermal source heat exchanger and the low-temperature receiver heat exchanger that are used for different phase transition parameters are isolated;
Said overflow pipe (3) or storage liquid container (1) are provided with the spilling water adjusting device, are used to regulate the water level in the thermal source heat exchanger.
5. the branch control phase-change heat-exchange system based on the classification heat exchange according to claim 1 is characterized in that the air intake of said vapour-liquid heat exchanger (21) vapour side is provided with steam-out (SO) pipe (20), and steam-out (SO) pipe (20) is provided with external steam flow control valve (19); Said external steam flow control valve (19) is connected by communication with external steam flow control valve controller (18) and steam flow control valve (8).
6. the branch control phase-change heat-exchange system based on the classification heat exchange according to claim 1 is characterized in that,
Be connected and installed thermal source heat exchanger pressure sensor (6) on the preceding steam pipe (9) of said steam flow control valve (8), be used to measure the inner gas pressure of reflect heat source heat exchanger;
The heat exchanger outer wall of said low temperature level thermal source heat exchanger (4) is provided with thermal source heat exchanger wall temperature sensor (2), is used to measure low temperature level thermal source heat exchanger outside wall temperature;
Said vapour-liquid heat exchanger steam outlet pipe (10) near low-temperature receiver heat exchanger (11) is provided with low-temperature receiver heat exchanger pressure sensor (12), is used to measure the inner gas pressure of low-temperature receiver heat exchanger,
Said vapour-liquid heat exchanger drain pipe (23) is provided with vapour-liquid heat exchanger fluid temperature sensor (22), is used to measure vapour-liquid heat exchanger and goes out liquid temp;
Condensate line (16) between said fluid storage tank (14) and the vapour-liquid heat exchanger (21) is provided with booster (17); Condensate line (16) between said low-temperature receiver heat exchanger (11) and the booster (17) is provided with condensate temperature sensor (15), is used to measure the temperature that low-temperature receiver heat exchanger (11) flows out condensate liquid;
Low-temperature receiver heat exchanger exhaust-valve is set on the upper collecting chamber of said low-temperature receiver heat exchanger (11), is used for the incondensable gas that the discharge system accumulates;
On the condensate line (16) in said booster (17) exit discharging tube is set, is used for liquid discharge system in the system;
Said vapour-liquid heat exchanger steam outlet pipe (10) is communicated with the lower collecting box of low-temperature receiver heat exchanger (11) through a steam pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204038546U CN202452865U (en) | 2011-10-21 | 2011-10-21 | Distributed control and phase change type heat exchange system based on classification heat exchange |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204038546U CN202452865U (en) | 2011-10-21 | 2011-10-21 | Distributed control and phase change type heat exchange system based on classification heat exchange |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063067A (en) * | 2011-10-21 | 2013-04-24 | 中国科学院过程工程研究所 | Graded heat exchange distributed control phase-change heat transfer system and heat transfer method |
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2011
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063067A (en) * | 2011-10-21 | 2013-04-24 | 中国科学院过程工程研究所 | Graded heat exchange distributed control phase-change heat transfer system and heat transfer method |
| CN103063067B (en) * | 2011-10-21 | 2014-09-24 | 中国科学院过程工程研究所 | Graded heat exchange distributed control phase-change heat transfer system and heat transfer method |
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