CN213273895U - High-efficient recovery unit of waste heat of compound phase transition heat exchanger - Google Patents
High-efficient recovery unit of waste heat of compound phase transition heat exchanger Download PDFInfo
- Publication number
- CN213273895U CN213273895U CN202021512311.3U CN202021512311U CN213273895U CN 213273895 U CN213273895 U CN 213273895U CN 202021512311 U CN202021512311 U CN 202021512311U CN 213273895 U CN213273895 U CN 213273895U
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- steam
- soft water
- phase change
- waste heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Air Supply (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model relates to a compound phase change heat exchanger's high-efficient recovery unit of waste heat, including last heat exchanger, lower heat exchanger, steam-water separator, air preheater, central control unit PLC and throttle control valve, lower heat exchanger include that airtight pipe row restraints component one, soft water pitcher one and flexible water pipe way one constitutes, airtight pipe row restraints a side surface that component one is located the flue gas flow direction and is provided with soft water pitcher one, closed pipe row restraints component one and soft water pitcher one bottom through flexible water pipe way one connection have valve body one, throttle control valve one side be provided with central control unit PLC, closed pipe row restraints component one and soft water pitcher one top through steam pipe way one intercommunication steam-water separator bottom side surface, a flexible water pipe top intercommunication steam-water separator bottom side surface, reduce the maintenance cost of equipment; the lowest wall surface temperature of the metal heating surface of the heat exchanger is controlled and adjustable, and the high-efficiency heat transfer characteristic of the heat pipe heat exchanger is reserved.
Description
Technical Field
The utility model relates to a high-efficient recovery unit of waste heat of compound phase transition heat exchanger belongs to new forms of energy technical field.
Background
At present, the heat pipe heat exchanger adjusts the number of heat pipes or the heat transfer area ratio of the cold end and the hot end of the heat pipe, so that the wall temperature of the heat pipe is designed above a certain dew point at one time. However, the smoke exhaust dew point changes along with the change of the sulfur and the moisture in the coal, and if the once designed dew point is higher than the actual acid dew point, the heat loss of the smoke exhaust is increased; if the disposable design dew point is below the actual acid dew point, corrosion is likely to occur. In order to avoid the wall temperature caused by acid dew corrosion, the exhaust gas temperature must be more than one time higher than the dew point temperature and cannot be reduced too low; the heat pipe is composed of hundreds of relatively independent closed single components, the wall surface temperature and the smoke exhaust temperature are in a multiple relation, the whole body is uneven, and a certain range of temperature difference exists; when the exhaust gas temperature is 132 ℃, the lowest wall surface temperature can only be controlled below 90 ℃; after the wall surface temperature is determined, the controllable and adjustable effect can be realized, but the adjustment range is limited by the water inlet temperature and the water outlet temperature; because the monitoring point is more in the actual operation, and control is complicated, and the safety margin is little, may bring technical problem such as hidden danger, needs to realize a novel efficient compound phase transition heat exchanger.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides a waste heat high-efficiency recovery device of a composite phase change heat exchanger, which keeps the temperature of the wall surface of a metal heating surface at a higher temperature level, keeps away from the corrosion area of an acid dew point, avoids dew formation corrosion and ash blockage caused by the dew formation corrosion, and reduces the maintenance cost of equipment; the lowest wall surface temperature of the metal heating surface of the heat exchanger is in a controllable and adjustable state, the high-efficiency heat transfer characteristic of the heat pipe heat exchanger is kept, meanwhile, the aging problem of the phase change heat exchanger can be effectively solved through the operation of the exhaust body, and the service life of equipment is greatly prolonged.
In order to achieve the above object, the utility model discloses a following technical scheme realizes: a high-efficiency waste heat recovery device of a composite phase-change heat exchanger comprises an upper heat exchanger, a lower heat exchanger, a steam-water separation device, an air preheater, a central control unit PLC and a throttle control valve, wherein the lower heat exchanger comprises a first closed pipe bundle component, a first soft water tank and a first soft water pipeline, the surface of one side, located in the flow direction of flue gas, of the first closed pipe bundle component is provided with the first soft water tank, the first closed pipe bundle component and the bottom of the first soft water tank are connected with a first valve body through the soft water pipeline, the surface of the middle part of the first soft water pipeline is provided with the throttle control valve, one side of the throttle control valve is provided with the central control unit PLC, the first closed pipe bundle component and the top of the first soft water tank are communicated with the surface of one side of the bottom of the steam-water separation device through a steam pipeline, the top end of the first soft water pipeline is, the air pressure detection meter is fixedly connected to the surface of the middle portion of the steam-water separation device, the upper heat exchanger comprises a closed pipe bundle component II, a soft water tank II and a soft water pipeline II, one side surface of the top of the steam-water separation device is connected with a valve body II through a steam pipeline II, the other side surface of the top of the steam-water separation device is connected to the surface of the bottom of the closed pipe bundle component II and the surface of the bottom of the soft water tank in the same direction through a soft water pipeline II, the surface of the top of the closed pipe bundle component II and the surface of the top of the soft water tank in the same direction are communicated with the steam pipeline II, and one side.
Preferably, the number of the first closed tube bundle component and the number of the second closed tube bundle component are both two.
Preferably, the steam-water separation device comprises a steam layer arranged at the upper part and a soft water layer arranged at the lower part.
Preferably, the central control unit PLC is electrically connected with the first valve body and the second valve body.
Preferably, one top end of the soft water pipeline is communicated and arranged in the soft water layer.
Preferably, the two first closed tube bundle members are arranged at intervals, and the two second closed tube bundle members are arranged at intervals.
Preferably, one side of the air pressure detection meter is connected with a steam-water separation device through a steam pipeline III.
Preferably, a third valve body is arranged in the middle of the third steam pipeline.
Preferably, the valve body is electrically connected with the central control unit PLC.
Preferably, a steam pipeline III connected with the air pressure detection meter is connected in the steam layer.
In summary, the utility model provides a waste heat high-efficiency recovery device of a composite phase change heat exchanger, which keeps the temperature of the wall surface of the metal heating surface at a higher temperature level, keeps away from the corrosion area of the acid dew point, avoids the dewing corrosion and the ash blockage caused by the dewing corrosion, and reduces the maintenance cost of the equipment; the lowest wall surface temperature of the metal heating surface of the heat exchanger is in a controllable and adjustable state, the high-efficiency heat transfer characteristic of the heat pipe heat exchanger is kept, meanwhile, the aging problem of the phase change heat exchanger can be effectively solved through the operation of the exhaust body, and the service life of equipment is greatly prolonged.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a third embodiment of the present invention;
fig. 5 is a four-structure diagram of the embodiment of the present invention;
in the figure: the device comprises an upper heat exchanger 1, a closed pipe bundle arranging component II 11, a soft water tank II 12, a soft water pipeline II 13, a valve body II 14, a lower heat exchanger 2, a closed pipe bundle arranging component I21, a soft water tank I22, a soft water pipeline I23, a valve body I24, a steam-water separation device 3, a steam layer 31, a soft water layer 32, an air pressure detection meter 33, an air preheater 4, a central control unit PLC5, a throttling control valve 6, a steam pipeline I7, a steam pipeline II 8, a steam pipeline III 111 and a valve body III 112.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1-5, the utility model relates to a high-efficiency waste heat recovery device of composite phase change heat exchanger, which comprises an upper heat exchanger 1, a lower heat exchanger 2, a steam-water separation device 3, an air preheater 4, a central control unit PLC5 and a throttle control valve 6, wherein the lower heat exchanger 2 comprises a first closed pipe bundle component 21, a first soft water tank 22 and a first soft water pipeline 23, the first closed pipe bundle component 21 is provided with the first soft water tank 22 on one side surface in the flow direction of flue gas, the first closed pipe bundle component 21 and the first soft water tank 22 are connected with a first valve body 24 through the first soft water pipeline 23, the first soft water pipeline 23 is provided with the throttle control valve 6 on the middle surface, one side of the throttle control valve 6 is provided with the central control unit PLC5, the first closed pipe bundle component 21 and the top of the first soft water tank 22 are communicated with one side surface of the bottom of the steam-water separation device 3 through the first steam pipeline 7, the top of the first soft, the middle surface of the steam-water separation device 3 is fixedly connected with an air pressure detection meter 33, the upper heat exchanger 1 comprises a closed pipe bundle component II 11, a soft water tank II 12 and a soft water pipeline II 13, one side surface of the top of the steam-water separation device 3 is connected with a valve body II 14 through a steam pipeline II 8, the other side surface of the top of the steam-water separation device 3 is connected to the bottom surface of the closed pipe bundle component II 11 and the bottom surface of the soft water tank II 12 in the same direction through the soft water pipeline II 13, the closed pipe bundle component II 11 and the top surface of the soft water tank II 12 in the same direction are communicated with the steam pipeline II 8, and one side of the upper.
Preferably, the number of the first closed tube bundle member 21 and the number of the second closed tube bundle member 11 are both two.
Preferably, the steam-water separation device 3 comprises an upper part provided with a steam layer 31 and a lower part provided with a soft water layer 32.
Preferably, the central control unit PLC5 is electrically connected to valve body one 24 and valve body two 14.
Preferably, the top end of the flexible water pipeline one 23 is communicated with and arranged in the flexible water layer 32.
Preferably, the two first closed tube bundle members 21 are arranged at intervals, and the two second closed tube bundle members 11 are arranged at intervals.
Preferably, the steam-water separator 3 is connected to one side of the air pressure detection gauge 33 through a steam pipeline III 111.
Preferably, a valve body III 112 is arranged in the middle of the steam pipeline III 111.
Preferably, the third valve body 112 is electrically connected with the central control unit PLC 5.
Preferably, the steam pipeline III 111 connected with the air pressure detection meter 33 is connected in the steam layer 31.
The utility model discloses the theory of operation does: the composite phase-change heat exchanger transfers heat by utilizing the phase-change latent heat of softened water in a plurality of closed tube bundle components connected in parallel, heats the lower end face of the heat tube, the water absorbs the heat and is vaporized into saturated steam, the saturated steam rises to the upper end face of the heat tube under a certain pressure difference, the heat is released to the outside and is condensed into liquid, the saturated water returns to a heated section through a steam-water separator, and is vaporized again and circulated in a reciprocating mode, and the unidirectional heat conduction of transferring the heat from a high end to a low end is completed.
The composite phase change heat exchanger has the advantages that the integral temperature distribution of the metal wall surfaces on a plurality of closed tube bundle components connected in parallel is uniform, the small gradient temperature difference (10-20 ℃) is kept with the temperature of flue gas, and the composite phase change heat exchanger has the special function of being independent of the temperature of a heated working medium.
The composite phase change heat exchanger is a heat release section outside a closed tube bundle component of a plurality of parallel tubes, heats the temperature of cold air entering the last stage inlet of the air preheater, and improves the temperature of the wall surface entering the air preheater, thereby ensuring that the equipment is prevented from low-temperature corrosion. The heat absorption section at the outer side of the closed tube bundle component connected in parallel absorbs the heat of the low-temperature flue gas waste heat between the exhaust gas temperature and the acid dew point, so that the subsequent dust remover and the like are prevented from low-temperature corrosion, thereby objectively saving fuel and reducing the emission of pollutants.
The composite phase change heat exchanger realizes closed-loop control of different minimum wall surface temperatures possibly occurring in the whole equipment through flow regulation of heat exchange flow of a phase change section, and ensures that the wall temperature is synchronously controllable and adjustable after the acid dew point changes caused by the change of fuel types such as coal quality. On the premise of ensuring the safe operation of the equipment, the energy-saving aim of recovering the waste heat of the flue gas to the maximum extent is achieved.
When the low wall surface cooling amplitude reaches 30 ℃, 12-15 tons of standard coal can be saved per year per ton of boiler, the boiler efficiency is stably improved by 1-2%, the coal consumption for power generation is reduced by 1-3g/Kwh, the thermal pollution and the emission of combustion waste gas are reduced, the emission of CO2 is reduced by 40-55 tons, and the boiler has good social, environmental and economic benefits.
The upper heat exchanger and the lower heat exchanger are communicated through a gas-water separation device, saturated steam and saturated water are in natural circulation in the closed system, the lower heat exchanger absorbs the waste heat of the flue gas at the tail part of the boiler to form saturated steam, the upper heat exchanger releases heat, and the saturated steam is changed into saturated water. The central control unit PLC is used for centralized control, so that the cooling rate of the upper heat exchanger is balanced with the heat absorption rate of the lower heat exchanger, the natural circulation of saturated steam and saturated water is balanced, and the wall temperature is kept constant at 115 ℃ under the atmospheric pressure of 1.64 times. The wall temperature can be adjusted within a certain range by adjusting the balance point of the cooling rate and the heat absorption rate.
As shown in fig. 2, the first embodiment: the demineralized water/condensate is heated.
The application occasions are as follows: cogeneration or pure thermal power generation enterprises. The basic principle is as follows: the water supply temperature entering the deaerator is increased, the air exhaust of the steam turbine is reduced, the external heat supply capacity is improved or the coal consumption of power generation is reduced.
As shown in fig. 3, the second embodiment: and (4) increasing the air temperature at the inlet of the air preheater and heating the desalted water.
The application occasions are as follows: the temperature of smoke at the outlet of the upper air preheater is not high, the tail part of the upper air preheater is likely to be subjected to condensation, and the amount of heated desalted water is limited. The basic principle is as follows: one part of the waste heat recovered from the reduction of the exhaust gas temperature is used for heating and supplying air, so that the inlet air temperature of the superior air preheater is increased, the lowest wall surface temperature of the tail part of the superior air preheater is higher than the acid dew point, and the dewing corrosion is prevented; the other part heats the demineralized water, thereby comprehensively improving the thermal efficiency.
As shown in fig. 4, the second embodiment: internal circulation mode.
The application occasions are as follows: the system has no field for heating the demineralized water. The basic principle is as follows: on one hand, a heating surface of a composite gas-water section and a composite gas-gas section is properly added behind the economizer to heat boiler feed water, reduce the temperature of exhaust smoke and improve the thermal efficiency of the boiler. On the other hand, the characteristics of controllable and adjustable integral wall temperature and no condensation of the phase change section are utilized to heat and supply air, so that the air preheater is ensured to avoid low-temperature condensation corrosion.
As shown in fig. 5, the second embodiment: waste heat boilers (medium and low pressure).
The application occasions are as follows: the water supply temperature and the hot air temperature of the system are high, and a user needs a certain amount of medium-pressure steam and low-pressure steam. The basic principle is as follows: on the one hand, the middle-pressure and low-pressure evaporation sections are additionally arranged in the steering chamber to produce middle-pressure and low-pressure steam so as to reduce the exhaust gas temperature and improve the thermal efficiency of the boiler. On the other hand, the characteristics of controllable and adjustable integral wall temperature and no condensation of the phase change section are utilized to heat and supply air, so that the air preheater is ensured to avoid low-temperature condensation corrosion.
To sum up, the utility model provides a waste heat high-efficiency recovery device of composite phase change heat exchanger, which keeps the temperature of the wall surface of the metal heating surface at a higher temperature level, keeps away from the corrosion area of the acid dew point, avoids the dewing corrosion and the ash blockage caused by the dewing corrosion, and reduces the maintenance cost of the equipment; the lowest wall surface temperature of the metal heating surface of the heat exchanger is in a controllable and adjustable state, the high-efficiency heat transfer characteristic of the heat pipe heat exchanger is kept, meanwhile, the aging problem of the phase change heat exchanger can be effectively solved through the operation of the exhaust body, and the service life of equipment is greatly prolonged.
Claims (10)
1. The efficient waste heat recovery device of the composite phase-change heat exchanger is characterized by comprising an upper heat exchanger (1), a lower heat exchanger (2), a steam-water separation device (3), an air preheater (4), a central control unit PLC (5) and a throttling control valve (6), wherein the lower heat exchanger (2) comprises a first closed pipe bundle component (21), a first soft water tank (22) and a first soft water pipeline (23), the first closed pipe bundle component (21) is provided with the first soft water tank (22) on the surface of one side, which is located in the flow direction of flue gas, of the first closed pipe bundle component (21), the bottoms of the first soft water tank (22) are connected with a first valve body (24) through the first soft water pipeline (23), the throttling control valve (6) is arranged on the surface of the middle of the first soft water pipeline (23), the central control unit PLC (5) is arranged on one side of the throttling control valve (6), the closed pipe bundle discharging component I (21) and the soft water tank I (22) are communicated with the surface of one side of the bottom of the steam-water separating device (3) through a steam pipeline I (7) at the top, the top end of the soft water pipeline I (23) is communicated with the surface of the other side of the bottom of the steam-water separating device (3), an air pressure detecting meter (33) is fixedly connected to the surface of the middle of the steam-water separating device (3), the upper heat exchanger (1) comprises a closed pipe bundle discharging component II (11), a soft water tank II (12) and a soft water pipeline II (13), the surface of one side of the top of the steam-water separating device (3) is connected with a valve body II (14) through a steam pipeline II (8), the surface of the other side of the top of the steam-water separating device (3) is connected to the surfaces of the same direction of the closed pipe bundle discharging component II (11) and the soft water tank II (12) through a soft water pipeline II (13), the closed pipe bundle discharging component II ( (8) And one side of the upper heat exchanger (1) is communicated with an air preheater (4).
2. The device for efficiently recycling the waste heat of the composite phase change heat exchanger as claimed in claim 1, wherein the number of the first closed tube bundle member (21) and the second closed tube bundle member (11) is two.
3. The device for efficiently recycling the waste heat of the composite phase change heat exchanger as claimed in claim 1, wherein the upper part of the steam-water separation device (3) is provided with a steam layer (31), and the lower part is provided with a soft water layer (32).
4. The device for recovering waste heat of a composite phase change heat exchanger efficiently as claimed in claim 1, wherein the central control unit PLC (5) is electrically connected with the first valve body (24) and the second valve body (14).
5. The device for recovering the waste heat of the composite phase change heat exchanger efficiently as claimed in claim 1, wherein the top end of the first flexible water pipe (23) is communicated with and arranged in the soft water layer (32).
6. The device for efficiently recycling the waste heat of the composite phase change heat exchanger as claimed in claim 2, wherein the two first closed tube bundle members (21) are arranged at intervals, and the two second closed tube bundle members (11) are arranged at intervals.
7. The device for efficiently recycling the waste heat of the composite phase change heat exchanger as claimed in claim 1, wherein one side of the air pressure detection meter (33) is connected with the steam-water separation device (3) through a steam pipeline III (111).
8. The device for efficiently recycling the waste heat of the composite phase change heat exchanger as claimed in claim 7, wherein a valve body III (112) is installed in the middle of the steam pipeline III (111).
9. The device for efficiently recycling the waste heat of the composite phase change heat exchanger as claimed in claim 8, wherein the valve body III (112) is electrically connected with the central control unit PLC (5).
10. The device for efficiently recycling the waste heat of the composite phase change heat exchanger as claimed in claim 1, wherein the steam pipeline III (111) connected with the air pressure detection meter (33) is connected in the steam layer (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512311.3U CN213273895U (en) | 2020-07-28 | 2020-07-28 | High-efficient recovery unit of waste heat of compound phase transition heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512311.3U CN213273895U (en) | 2020-07-28 | 2020-07-28 | High-efficient recovery unit of waste heat of compound phase transition heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213273895U true CN213273895U (en) | 2021-05-25 |
Family
ID=75968343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021512311.3U Active CN213273895U (en) | 2020-07-28 | 2020-07-28 | High-efficient recovery unit of waste heat of compound phase transition heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213273895U (en) |
-
2020
- 2020-07-28 CN CN202021512311.3U patent/CN213273895U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102359739B (en) | Gas-steam circulation heating-electricity-cooling combined supply system and method for thermal power plant with zero energy loss rate | |
| CN106090880A (en) | A kind of machine stove set heat circulation afterheat recycling system | |
| CN204739568U (en) | Energy saving and emission reduction system that horizontal phase transition heat exchanger and prefix type hydrophily formula GGH unite | |
| CN105889897B (en) | A kind of thermal power plant residual heat integrative recycling system and method | |
| CN102031999A (en) | Thermal power generator set with high-efficient circulating system | |
| WO2013040977A1 (en) | System for improving utilization grade of waste heat of flue gas | |
| CN201973697U (en) | System capable of generating low-pressure steam by utilizing flue gas afterheat | |
| CN104964265A (en) | Energy-saving emission reduction system and energy-saving emission reduction method of horizontal type phase change heat exchanger and front-arrangement type water medium type GGH combined | |
| CN114909193B (en) | Thermal power generating unit flexible operation system based on fused salt heat storage | |
| CN106016240A (en) | Combined coal economizer of small coal-fired boiler | |
| CN86105222A (en) | Utilize the low-pressure energy-saving hybrid system of smoke discharging residual heat | |
| CN204421044U (en) | Based on the flue gas waste heat utilization device of cold and heat combined supply | |
| CN100520268C (en) | Fume-fume hot pipe heater exchanger for fume desulphurization in heat-engine plant | |
| CN201289067Y (en) | Hot pipe combined exhaust heat boiler | |
| CN202869081U (en) | Device for recovering flue gas and cooling water waste heat of waste heat power generation system | |
| CN205048411U (en) | Gas boiler | |
| CN201926121U (en) | Horizontal type condensing normal pressure hot water boiler | |
| CN213273895U (en) | High-efficient recovery unit of waste heat of compound phase transition heat exchanger | |
| CN202403257U (en) | Closed circulating coal economizer | |
| CN215112723U (en) | Temperature adjusting device for flue gas bypass heat exchange | |
| CN102012039B (en) | Forced circulation air preheat system | |
| CN201289066Y (en) | Hot pipe combined medium-pressure exhaust heat boiler | |
| CN2444189Y (en) | Clausilium type heat energy recover using flue gas cooling | |
| CN113983443A (en) | Gas boiler waste heat recovery utilizes system based on high temperature steam heat pump | |
| CN107345656A (en) | A kind of steam raising plant using residual heat from boiler fume |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |