CN212481362U - Energy-saving corrosion-resistant efficient heat exchange device - Google Patents
Energy-saving corrosion-resistant efficient heat exchange device Download PDFInfo
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- CN212481362U CN212481362U CN202021079646.0U CN202021079646U CN212481362U CN 212481362 U CN212481362 U CN 212481362U CN 202021079646 U CN202021079646 U CN 202021079646U CN 212481362 U CN212481362 U CN 212481362U
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Abstract
The utility model discloses an energy-conserving corrosion resistant high-efficient heat transfer device, include: two phase change heat releasing modules and two phase change heat absorbing modules which are arranged up and down, and a gas-liquid separation tower which is arranged between the phase change heat releasing modules and the phase change heat absorbing modules, the upper air collecting pipe in the phase change heat absorption module is communicated with the lower end of a first ascending pipeline, the upper end of the first ascending pipeline upwards extends into the gas-liquid separation tower and is positioned in the upper space of the gas-liquid separation tower, the top of the gas-liquid separation tower is communicated with the upper air collecting pipe in the phase change heat release module through a second ascending pipeline, an induced draft fan is arranged at an air inlet of the phase change heat release module, the bottom of a lower liquid collecting pipe in the phase change heat release module is communicated with the upper end of a first descending pipeline, the lower end of the first descending pipeline extends into the gas-liquid separation tower and is immersed in a liquid working medium in the lower space in the gas-liquid separation, the bottom of the gas-liquid separation tower is communicated with a lower liquid collecting pipe in the phase change heat absorption module through a second descending pipeline. The utility model has the advantages of energy saving and corrosion resistance.
Description
Technical Field
The utility model relates to an energy-saving equipment technical field of trades such as electric power, chemical industry metallurgy, concretely relates to energy-conserving corrosion resistant high-efficient heat transfer device.
Background
The boiler smoke heat loss is one of the main heat losses in a power station boiler, and the smoke heat loss is one of the largest heat losses of the coal-fired primary boilers and accounts for more than 75% of the total heat loss of the coal-fired boiler. The main factor causing the heat loss of the exhaust gas is the exhaust gas temperature, and in general, every 10 ℃ increase of the exhaust gas temperature is as follows: the heat loss of the exhaust gas is increased by 0.6-1%, and the heat consumption is increased by 1.2-2.4%. In addition, the overhigh exhaust gas temperature not only can seriously reduce the utilization rate of energy, but also can greatly influence a subsequent desulfurization flue gas treatment system for treating the flue gas, reduce the dust removal efficiency of a dust remover and increase the water consumption of a desulfurization tower.
At present, a plurality of domestic power plants adopt a low-temperature economizer technology to reduce the exhaust gas temperature and improve the economy of the power plants. Condensed water in a turbine thermodynamic system absorbs heat of exhaust smoke in a low-temperature economizer, the exhaust smoke temperature is reduced, the condensed water is heated and is returned to a turbine low-pressure heating system after the temperature is raised, however, coal, oil, natural gas and the like are sulfur-containing fuels, sulfur dioxide and sulfur trioxide are produced during combustion, sulfur trioxide and water vapor generate chemical reaction under a certain temperature condition to generate sulfuric acid vapor, the critical temperature of the reaction is called as an acid dew point, if the temperature of a metal wall surface in equipment at the tail part of a boiler is lower than the condensation point (acid dew point) of the sulfuric acid vapor, liquid sulfuric acid (acid dew) is formed on the surface of the metal heat exchange equipment, corrosion can be caused to the metal heat exchange equipment, leakage can be caused, the operation safety of the equipment and the service life of the equipment are influenced, meanwhile, ash in the flue gas.
In order to more effectively utilize the flue gas waste heat and further improve the economy of the generator set, a corrosion-resistant heat exchange system device needs to be developed, the flue gas waste heat is deeply utilized, the utilization efficiency of the flue gas waste heat is improved, acid dew can be prevented from corroding metal equipment, the effective service life of the equipment is prolonged, and the production cost is reduced.
The average exhaust gas temperature of a general power station is about 160 ℃, and after the safety margin of 20 ℃ is deducted, the waste heat with the temperature difference of more than 40 ℃ from the dew point (97 ℃) of the exhaust gas can be utilized; as a thermoelectric enterprise, the lower-quality waste heat has the advantages of large quantity, multiple points, wide range and certain difficulty in recycling. If the heat energy can be effectively utilized, the heat efficiency of the whole plant can be obviously improved, and the production cost can be reduced.
Through the investigation of a thermodynamic system, the high-capacity medium which has direct heat transfer temperature difference with the low-temperature flue gas only has primary air and secondary air of a boiler. The design temperature of the secondary air is 20 ℃, the secondary air is heated to 160 ℃ by an original air preheater of the boiler and then is sent into a hearth, if the air with lower temperature is used for absorbing the waste heat in the flue gas with higher temperature, the flue gas enters the air preheater and is further heated, so that the temperature of combustion-supporting air is increased, the efficiency of the boiler can be improved, and the purposes of saving energy and reducing cost are achieved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an energy-conserving corrosion resistant high-efficient heat transfer device of energy-conserving, anticorrosive and ability reduction in production cost.
In order to achieve the above purpose, the utility model adopts the following technical scheme: energy-conserving corrosion resistant high-efficient heat transfer device includes: the device comprises two phase-change heat exchange modules which are arranged up and down and a gas-liquid separation tower arranged between the two phase-change heat exchange modules, wherein the upper part in the gas-liquid separation tower is a gaseous working medium, and the lower part in the gas-liquid separation tower is a liquid working medium;
the structure of the phase-change heat-exchange module comprises: the phase change heat transfer casing that both ends were provided with air inlet and gas outlet respectively around, the inside of phase change heat transfer casing is by preceding to back interval setting gradually a plurality of phase change heat transfer pieces along the gas flow direction, the structure of phase change heat transfer piece includes: the upper and lower ends of each heat exchange finned tube are respectively communicated with the upper communicating tube and the lower communicating tube; the lower communicating pipes of all the phase-change heat exchange sheets are communicated with the lower liquid collecting pipe at the same time, and the upper communicating pipes of all the phase-change heat exchange sheets are communicated with the upper gas collecting pipe at the same time;
the phase-change heat exchange module at the lower side is defined as a phase-change heat absorption module, and the liquid working medium is converted into a gaseous working medium due to heat absorption after passing through the phase-change heat absorption module; the phase-change heat exchange module positioned on the upper side is defined as a phase-change heat release module, and the gaseous working medium is converted into a liquid working medium due to heat dissipation after passing through the phase-change heat release module; the phase-change heat absorption device comprises a phase-change heat absorption module, a first ascending pipeline, a gas-liquid separation tower, a first descending pipeline, a second ascending pipeline, a phase-change heat release module, a draught fan, a second descending pipeline, a gas-liquid separation tower and a phase-change heat release module.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: the lower liquid collecting pipe in each phase-change heat-exchange module is provided with an emptying pipe with a valve, a liquid inlet and outlet pipe with a valve, a liquid supplementing pipe with a valve and a thermocouple for detecting the liquid temperature in the lower liquid collecting pipe, and the upper gas collecting pipe in each phase-change heat-exchange module is provided with a gas discharging pipe with a valve.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: the upper gas collecting pipe in the phase change heat absorption module is provided with a thermocouple for detecting the temperature of the working medium steam in the upper gas collecting pipe and a temperature regulator capable of regulating the temperature of the working medium steam in the upper gas collecting pipe according to the temperature of the working medium steam fed back by the thermocouple.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: the structure of the temperature regulator comprises: the temperature control system comprises a controller, a temperature control water source, an adjusting pump and a temperature control pipe penetrating through an upper communicating pipe and an upper gas collecting pipe, wherein the temperature control pipe is connected with the temperature control water source through the adjusting pump, and the controller is simultaneously electrically connected with the adjusting pump and thermocouples in a phase change heat absorption module and used for detecting the temperature of working medium steam in the upper gas collecting pipe.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: the phase change heat exchange shell in the phase change heat exchange module is formed by assembling a bottom frame, a side plate, a top plate and reinforcing angle steel.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: an inspection door is arranged on a side plate of the phase change heat exchange shell.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: and the smoke facing surface of each heat exchange finned tube in the first row of phase change heat exchange fins in the phase change heat absorption module along the gas flowing direction is provided with an anti-abrasion tile.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: the specific mounting structure of the wear tile includes: the inner side of the anti-abrasion tile is provided with a clip with a U-shaped bayonet, and the anti-abrasion tile is detachably mounted on the heat exchange finned tube by buckling the U-shaped bayonet of the clip on the heat exchange finned tube.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: and the gas facing side of each phase-change heat exchange module is provided with a guide plate for guiding gas to flow to the phase-change heat exchange fins.
Further, aforementioned energy-conserving corrosion resistant high-efficient heat transfer device, wherein: and the outer parts of the upper communicating pipe and the lower communicating pipe in each phase-change heat exchange module are respectively provided with a collecting pipe protecting plate for protecting the corresponding communicating pipe.
Through the implementation of the above technical scheme, the beneficial effects of the utility model are that:
(1) reliable: the energy-saving system can be independently controlled, and the normal operation of the boiler is not influenced; the heat exchanger is suitable for various coal-fired, oil-fired and gas-fired boilers, industrial furnaces and heat exchange equipment in industries such as steel and petrochemical industry;
(2) energy conservation: the energy consumption can be reduced, the steam production rate per ton of coal can be improved, the boiler output can be increased, and the thermal efficiency of the boiler can be stably improved by more than 1.5 percent;
(3) water conservation: the exhaust gas temperature of the post-stage desulfurization system is reduced while the heat energy is recovered, so that a large amount of water for the desulfurization process can be saved;
(4) and (3) corrosion prevention: the inlet air temperature of the air preheater is increased by recovering the waste heat of the boiler exhaust smoke, so that the lowest wall surface temperature of the tail part of the air preheater is higher than the acid dew point temperature, and the air preheater is prevented from being corroded by acid dew; even if the load and the fuel type are changed, acid dew corrosion can not be generated, the problem of acid dew corrosion of equipment is fundamentally solved from the mechanism, and the generation of new dewing ash is eliminated;
(5) compared with a common heat exchanger, the heat exchanger can greatly reduce the exhaust temperature of waste gas, and simultaneously maintain the wall temperature of the whole heat exchange equipment at a proper temperature level, so that the wall temperature of the whole heat exchange equipment is always about 10 ℃ above an acid dew point, and the acid dew corrosion is prevented, thereby eliminating the hidden trouble of leakage; the heat efficiency of the heat exchange equipment is improved to the greatest extent, and the phenomena of low-temperature corrosion and ash blockage caused by condensation are avoided;
(6) emission reduction: the energy consumption is saved, the emission is reduced to the maximum extent, the emission of CO2 and NOX is reduced, and meanwhile, the emission of dust is effectively reduced;
(7) the defects that the load of an air preheater can not be actively adjusted, 10-30% of heat pipe heat transfer function fails every year, the air leakage rate is high and the like are overcome;
(8) high heat transfer efficiency, small volume, light weight, no defects of a heat carrier circulating pump, low operating pressure in a pipe, complex system, small application range and the like.
Drawings
FIG. 1 is a schematic view of the structural principle of the energy-saving corrosion-resistant high-efficiency heat exchange device.
Fig. 2 is a schematic structural view of the phase change heat absorption module shown in fig. 1.
Fig. 3 is an enlarged schematic view of a portion a shown in fig. 2.
Fig. 4 is a schematic structural view of fig. 2 with the bell mouth hidden in the left-hand view.
Fig. 5 is a schematic structural view in a top view of fig. 4.
Fig. 6 is a schematic structural view of the phase change heat sink sheet shown in fig. 5.
Fig. 7 is a schematic view of the left side view of fig. 6.
Fig. 8 is an enlarged schematic view of a portion B shown in fig. 7.
FIG. 9 is a schematic view showing the positional relationship between the heat exchanger finned tube and the wear prevention tile as viewed from above in FIG. 7.
Fig. 10 is a schematic structural view of the phase change heat release module shown in fig. 1.
Fig. 11 is an enlarged schematic view of a portion C shown in fig. 10.
Fig. 12 is an enlarged schematic view of a portion D shown in fig. 10.
Fig. 13 is a schematic structural view of fig. 10 with the bell mouth hidden in the left view.
Fig. 14 is a schematic structural view in a top view of fig. 13.
Fig. 15 is a schematic structural view of the phase change exothermic sheet shown in fig. 14.
Fig. 16 is a schematic view of the left side view of fig. 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the energy-saving corrosion-resistant high-efficiency heat exchange device comprises: the two phase-change heat exchange modules are arranged up and down, the phase-change heat exchange module positioned at the upper side is defined as a phase-change heat release module 1, and gaseous working media are converted into liquid working media due to heat dissipation after passing through the phase-change heat release module; the phase change heat exchange module at the lower side is defined as a phase change heat absorption module 2, and the liquid working medium is converted into a gaseous working medium due to heat absorption after passing through the phase change heat absorption module; the gas-liquid separation tower 3 is arranged between the phase change heat release module 1 and the phase change heat absorption module 2, the upper part in the gas-liquid separation tower 3 is a gaseous working medium, and the lower part in the gas-liquid separation tower 3 is a liquid working medium 4; in the embodiment, the liquid working medium is water, and the gaseous working medium is steam; the working principle is as follows: the phase-change heat exchange module transfers heat by utilizing latent heat of vaporization of a phase-change working medium in a plurality of closed heat exchange tube bundles connected in parallel, water in the phase-change heat absorption module 2 absorbs the heat and is vaporized into saturated steam, the steam rises to the phase-change heat release module 1 under certain pressure difference to release the heat and is then condensed into liquid, the saturated water returns to the phase-change heat absorption module 2 through the steam-water separation tower 3 and is vaporized again and circulates in a reciprocating manner, and the heat is conducted from a high end to a low end in a one-way manner;
as shown in fig. 10, 11, 12, 13, 14, 15, and 16, the phase-change heat-releasing module 1 includes: the front end and the rear end of the phase-change heat exchange shell are respectively provided with a first air inlet 11 and a first air outlet 12, in this embodiment, the phase-change heat exchange shell in the phase-change heat release module 1 is defined as a phase-change heat release shell 13, the phase-change heat release shell 13 is formed by assembling an underframe, a side plate, a top plate and reinforcing angle steel, the side plate of the phase-change heat release shell 13 is provided with a first inspection door 131, and the first air inlet 11 and the first air outlet 12 of the phase-change heat exchange shell are respectively provided with a bell mouth 116; inside phase transition heat release casing 13 is followed gas flow direction by preceding a plurality of phase transition heat transfer pieces that back interval is provided with in proper order, in this embodiment, the phase transition heat transfer piece of definition phase transition heat release module 1 is phase transition heat release piece 14, phase transition heat release piece 14's structure includes: the heat exchanger comprises a first upper communicating pipe 15 and a first lower communicating pipe 16 which are vertically distributed, wherein a plurality of first heat exchange finned tubes 17 which are arranged in rows at intervals from left to right are connected between the first upper communicating pipe 15 and the first lower communicating pipe 16, and the upper end and the lower end of each first heat exchange finned tube 17 are respectively communicated with the first upper communicating pipe 15 and the first lower communicating pipe 16; the first lower communicating tubes 16 of all the phase change radiating fins 14 are communicated with the first lower liquid collecting tube 18 at the same time, and the first upper communicating tubes 15 of all the phase change radiating fins 14 are communicated with the first upper gas collecting tube 19 at the same time; in the embodiment, the phase change heat release fins of which all the first heat exchange finned tubes are left-handed finned tubes are defined as left-handed phase change heat release fins, the phase change heat release fins of which all the second heat exchange finned tubes are right-handed finned tubes are defined as right-handed phase change heat release fins, and the left-handed phase change heat release fins and the right-handed phase change heat release fins are alternately arranged in the phase change heat release shell from front to back along the gas flowing direction;
a first emptying pipe 110 with a valve, a first liquid inlet and outlet pipe 111 with a valve and a first thermocouple 112 for detecting the temperature of liquid in the first lower liquid collecting pipe 18 are arranged on the first lower liquid collecting pipe 18 in the phase change heat releasing module 1, and a first gas outlet pipe 113 with a valve is arranged on the first upper gas collecting pipe 19 in the phase change heat releasing module 1; in this embodiment, a first guide plate 114 for guiding gas to flow to the phase change heat-releasing fin 14 is disposed on the gas-facing side of the phase change heat-releasing module 1, and a first header guard plate 115 for protecting the corresponding communication pipe is disposed around the exterior of each of the first upper communication pipe 15 and the first lower communication pipe 16 in the phase change heat-releasing module 1;
as shown in fig. 2, 3, 4, 5, 6, 7, 8, and 9, the phase-change heat absorption module 2 includes: the front end and the rear end of the phase change heat exchange shell are respectively provided with a second air inlet 21 and a second air outlet 22, in this embodiment, the phase change heat exchange shell in the phase change heat absorption module 2 is defined as a phase change heat absorption shell 23, the phase change heat absorption shell 23 is formed by assembling an underframe, a side plate, a top plate and reinforcing angle steel, the side plate of the phase change heat absorption shell 23 is provided with a second inspection door 231, and the second air inlet 21 and the second air outlet 22 of the phase change heat absorption shell 23 are respectively provided with a bell mouth 218; a plurality of phase change heat transfer sheets are sequentially arranged inside the phase change heat absorption shell 23 along the gas flowing direction from front to back at intervals, in this embodiment, the phase change heat transfer sheet in the phase change heat absorption module 2 is defined as a phase change heat absorption sheet 24, and the structure of the phase change heat absorption sheet 24 includes: a second upper communicating pipe 25 and a second lower communicating pipe 26 which are distributed up and down, a plurality of second heat exchange finned tubes 27 which are arranged in rows at intervals left and right are connected between the second upper communicating pipe 25 and the second lower communicating pipe 26, and the upper end and the lower end of each second heat exchange finned tube 27 are respectively communicated with the second upper communicating pipe 25 and the second lower communicating pipe 26; the second lower communicating pipes 26 of all the phase change heat absorbing sheets 24 are communicated with the second lower liquid collecting pipe 28 at the same time, and the second upper communicating pipes 25 of all the phase change heat absorbing sheets 24 are communicated with the second upper gas collecting pipe 29 at the same time; in this embodiment, the phase change heat absorbing fins of which all the second heat exchange finned tubes are left-handed finned tubes are defined as left-handed phase change heat absorbing fins, the phase change heat absorbing fins of which all the second heat exchange finned tubes are right-handed finned tubes are defined as right-handed phase change heat absorbing fins, and the left-handed phase change heat absorbing fins and the right-handed phase change heat absorbing fins are alternately arranged in the phase change heat absorbing shell from front to back along the gas flowing direction;
a second emptying pipe 210 with a valve, a second liquid inlet and outlet pipe 211 with a valve, a liquid supplementing pipe 212 with a valve and a second thermocouple 213 for detecting the liquid temperature in the second lower liquid collecting pipe 28 are arranged on the second lower liquid collecting pipe 28 in the phase change heat absorption module 2, and a second gas discharging pipe 214 with a valve is arranged on the second upper gas collecting pipe 29 in the phase change heat absorption module 2; in this embodiment, a second guide plate 216 for guiding the gas to flow to the phase change heat absorbing sheet 24 is disposed on the gas-facing side of the phase change heat absorbing module 2, and a second header guard plate 217 for protecting the corresponding communicating pipe is disposed around the exterior of each of the second upper communicating pipe 25 and the second lower communicating pipe 26 in the phase change heat absorbing module 2;
in this embodiment, the anti-abrasion tiles 35 are arranged on the smoke facing surface of each second heat exchange finned tube 27 in the first row of phase change heat absorbing sheets 24 in the phase change heat absorbing module 2 along the gas flowing direction, and the anti-abrasion tiles 35 can protect the second heat exchange finned tubes, so that the second heat exchange finned tubes are prevented from being directly washed and damaged by smoke, and the service life of the equipment is prolonged; in this embodiment, the specific installation structure of the wear-resistant tile 35 includes: the inner side of the anti-abrasion tile 35 is provided with a clip 36 with a U-shaped bayonet, and the anti-abrasion tile 35 is detachably arranged on the second heat exchange fin tube 27 by buckling the U-shaped bayonet of the clip 36 on the second heat exchange fin tube 27, so that the anti-abrasion tile is convenient to disassemble, assemble and replace, and the installation and maintenance efficiency is improved;
in this embodiment, a third thermocouple 215 for detecting the temperature of the working medium vapor in the second upper gas collecting pipe 29 and a temperature regulator capable of regulating the temperature of the working medium vapor in the second upper gas collecting pipe 29 according to the temperature of the working medium vapor fed back by the third thermocouple 215 are arranged in the second upper gas collecting pipe 29 in the phase change heat absorption module 2, and according to the principle of PV = nRT, in the closed container, the higher the gas temperature is, the higher the pressure in the container becomes, so the temperature regulator indirectly regulates the internal pressure of the gas-liquid separation tower 3 by regulating the temperature of the working medium vapor in the second upper gas collecting pipe 29 to enter the gas-liquid separation tower 3, thereby ensuring that the pressure in the gas-liquid separation tower can be kept at a safe level and ensuring safe and smooth running of the equipment; in the present embodiment, the structure of the temperature regulator includes: the controller 31 is electrically connected with the regulating pump 33 and a third thermocouple 215 which is arranged in the phase-change heat absorption module 2 and used for detecting the temperature of the working medium steam in the second upper gas collecting pipe 29, the controller 31 can automatically control and regulate the flow rate of water flowing through the temperature regulating pipe 34 according to the temperature of the working medium steam in the second upper gas collecting pipe 29 fed back by the third thermocouple 215 so that the working medium steam in the second upper gas collecting pipe 29 exchanges heat with the temperature regulating pipe 24, the temperature of the working medium steam in the second upper gas collecting pipe 29 is regulated, the pressure in the gas-liquid separation tower can be kept at a safe level, and the safe and smooth running of equipment is ensured; in the embodiment, the pipe diameter of each second upper communicating pipe 25 in the phase change heat absorption module 2 is gradually reduced along the gas flowing direction, and the temperature adjusting pipe 34 is arranged in the two upper communicating pipes at the foremost end in a penetrating manner, so that the phase change speed can be ensured to be more balanced;
the second upper gas collecting pipe in the phase change heat absorption module 2 is communicated with the lower end of a 29 first ascending pipeline 5, the upper end of the first ascending pipeline 5 upwards extends into the gas-liquid separation tower 3 and is positioned in the upper space of the gas-liquid separation tower 3, the top of the gas-liquid separation tower 3 is communicated with a first upper gas collecting pipe 19 in the phase change heat release module 1 through a second ascending pipeline 6, a first gas inlet 11 of the phase change heat release module 1 is communicated with an air outlet of a draught fan 8 through a cold air inlet pipeline 7, the bottom of a first lower gas collecting pipe 18 in the phase change heat release module 1 is communicated with the upper end of a first descending pipeline 9, the lower end of the first descending pipeline 9 extends into the gas-liquid separation tower 3 and is immersed in a liquid working medium 4 in the lower space in the gas-liquid separation tower 3, the bottom of the gas-liquid separation tower 3 is communicated with a second lower liquid collecting pipe 28 in the phase change heat absorption module 2 through a second descending pipeline 10; when the phase-change heat absorption device works, the phase-change heat absorption module 2, the first ascending pipeline 5, the gas-liquid separation tower 3, the second ascending pipeline 6, the phase-change heat release module 1, the first descending pipeline 9, the gas-liquid separation tower 3 and the second descending pipeline form a closed circulation loop;
during installation, the first air outlet 12 of the phase change heat release module 1 is connected with an air preheater through a hot air outlet pipeline 37, the second air inlet 21 of the phase change heat absorption module 2 is connected with a smoke exhaust pipeline of a boiler through a smoke inlet flue 38, and the second air outlet 22 of the phase change heat absorption module 2 is connected with a dust remover;
when the phase-change heat absorption device works, liquid working medium (usually water) in each second heat exchange finned tube 27 in the phase-change heat absorption module 2 exchanges heat with superheated flue gas (the temperature of the flue gas is 160 ℃) discharged by a boiler, the superheated flue gas discharged by the boiler is cooled, the temperature of the flue gas is reduced to 115 ℃ after the heat exchange, the liquid working medium in each second heat exchange finned tube 27 in the phase-change heat absorption module 2 absorbs heat and is heated and evaporated to form working medium steam after the heat exchange, the working medium steam sequentially enters the corresponding second upper communicating tubes 25 through the corresponding second heat exchange finned tubes 27, the working medium steam in each second upper communicating tube 25 is collected into the second upper gas collecting tubes 29, the working medium steam in the second upper gas collecting tubes 29 enters the upper space of the gas-liquid separation tower 3 through the first ascending pipelines 5, the working medium steam in the upper space of the gas-liquid separation tower 3 enters the first upper gas collecting tubes 19 of the phase-change heat release module 1 through the second ascending pipelines 6, the cold air is automatically distributed into each first upper communicating pipe 15 and each first heat exchange finned tube 17 through a first upper air collecting pipe 19, after the external cold air is introduced into the phase change heat release module 1 through a cold air inlet pipeline 7 by an induced draft fan 8, the cold air can exchange heat with the working medium steam in each first heat exchange finned tube 17, the cold air forms hot air with the smoke temperature of 20 ℃ after heat exchange, and enters the air preheater through a hot air outlet pipeline 37, the working medium steam in each first heat exchange finned tube 17 in the phase change heat release module 1 forms condensate after heat exchange, the condensate is condensed on the tube wall and is collected into the corresponding first lower communicating pipe 16 under the action of gravity, the condensate in each first lower communicating pipe 16 is collected into the first lower liquid collecting pipe 18 and flows back into the gas-liquid separation tower 3 through a first lower pipeline 9, the liquid working medium in the gas-liquid separation tower 3 flows back into a second lower liquid collecting pipe 28 of the phase change heat absorption module 2 through a second lower pipeline 10, and then is automatically distributed to the second heat exchange finned tubes 27 through the second lower communicating tubes 26, and the superheated flue gas discharged by the boiler is cooled again.
The utility model has the advantages that:
(1) reliable: the energy-saving system can be independently controlled, and the normal operation of the boiler is not influenced; the heat exchanger is suitable for various coal-fired, oil-fired and gas-fired boilers, industrial furnaces and heat exchange equipment in industries such as steel and petrochemical industry;
(2) energy conservation: the energy consumption can be reduced, the steam production rate per ton of coal can be improved, the boiler output can be increased, and the thermal efficiency of the boiler can be stably improved by more than 1.5 percent;
(3) water conservation: the exhaust gas temperature of the post-stage desulfurization system is reduced while the heat energy is recovered, so that a large amount of water for the desulfurization process can be saved;
(4) and (3) corrosion prevention: the inlet air temperature of the air preheater is increased by recovering the waste heat of the boiler exhaust smoke, so that the lowest wall surface temperature of the tail part of the air preheater is higher than the acid dew point temperature, and the air preheater is prevented from being corroded by acid dew; even if the load and the fuel type are changed, acid dew corrosion can not be generated, the problem of acid dew corrosion of equipment is fundamentally solved from the mechanism, and the generation of new dewing ash is eliminated;
(5) compared with a common heat exchanger, the heat exchanger can greatly reduce the exhaust temperature of waste gas, and simultaneously maintain the wall temperature of the whole heat exchange equipment at a proper temperature level, so that the wall temperature of the whole heat exchange equipment is always about 10 ℃ above an acid dew point, and the acid dew corrosion is prevented, thereby eliminating the hidden trouble of leakage; the heat efficiency of the heat exchange equipment is improved to the greatest extent, and the phenomena of low-temperature corrosion and ash blockage caused by condensation are avoided;
(6) emission reduction: the energy consumption is saved, the emission is reduced to the maximum extent, the emission of CO2 and NOX is reduced, and meanwhile, the emission of dust is effectively reduced;
(7) the defects that the load of an air preheater can not be actively adjusted, 10-30% of heat pipe heat transfer function fails every year, the air leakage rate is high and the like are overcome;
(8) high heat transfer efficiency, small volume, light weight, no defects of a heat carrier circulating pump, low operating pressure in a pipe, complex system, small application range and the like.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.
Claims (10)
1. Energy-conserving corrosion resistant high-efficient heat transfer device, its characterized in that: the method comprises the following steps: the device comprises two phase-change heat exchange modules which are arranged up and down and a gas-liquid separation tower arranged between the two phase-change heat exchange modules, wherein the upper part in the gas-liquid separation tower is a gaseous working medium, and the lower part in the gas-liquid separation tower is a liquid working medium;
the structure of the phase-change heat-exchange module comprises: the phase change heat transfer casing that both ends were provided with air inlet and gas outlet respectively around, the inside of phase change heat transfer casing is by preceding to back interval setting gradually a plurality of phase change heat transfer pieces along the gas flow direction, the structure of phase change heat transfer piece includes: the upper and lower ends of each heat exchange finned tube are respectively communicated with the upper communicating tube and the lower communicating tube; the lower communicating pipes of all the phase-change heat exchange fins are communicated with the lower liquid collecting pipe at the same time, and the upper communicating pipes of all the phase-change heat exchange fins are communicated with the upper gas collecting pipe at the same time;
the phase-change heat exchange module at the lower side is defined as a phase-change heat absorption module, and the liquid working medium is converted into a gaseous working medium due to heat absorption after passing through the phase-change heat absorption module; the phase-change heat exchange module positioned on the upper side is defined as a phase-change heat release module, and the gaseous working medium is converted into a liquid working medium due to heat dissipation after passing through the phase-change heat release module; the phase-change heat absorption device comprises a phase-change heat absorption module, a first ascending pipeline, a gas-liquid separation tower, a first descending pipeline, a second ascending pipeline, a phase-change heat release module, a draught fan, a second descending pipeline, a gas-liquid separation tower and a phase-change heat release module.
2. The energy-saving corrosion-resistant efficient heat exchange device according to claim 1, characterized in that: the lower liquid collecting pipe in each phase-change heat-exchange module is provided with an emptying pipe with a valve, a liquid inlet and outlet pipe with a valve, a liquid supplementing pipe with a valve and a thermocouple for detecting the liquid temperature in the lower liquid collecting pipe, and the upper gas collecting pipe in each phase-change heat-exchange module is provided with a gas discharging pipe with a valve.
3. The energy-saving corrosion-resistant efficient heat exchange device according to claim 1, characterized in that: the upper gas collecting pipe in the phase change heat absorption module is provided with a thermocouple for detecting the temperature of the working medium steam in the upper gas collecting pipe and a temperature regulator capable of regulating the temperature of the working medium steam in the upper gas collecting pipe according to the temperature of the working medium steam fed back by the thermocouple.
4. The energy-saving corrosion-resistant efficient heat exchange device according to claim 3, characterized in that: the structure of the temperature regulator comprises: the temperature control system comprises a controller, a temperature control water source, an adjusting pump and a temperature control pipe penetrating through an upper communicating pipe and an upper gas collecting pipe, wherein the temperature control pipe is connected with the temperature control water source through the adjusting pump, and the controller is simultaneously electrically connected with the adjusting pump and thermocouples in a phase change heat absorption module and used for detecting the temperature of working medium steam in the upper gas collecting pipe.
5. The energy-saving corrosion-resistant efficient heat exchange device according to claim 1, characterized in that: the phase change heat exchange shell in the phase change heat exchange module is formed by assembling a bottom frame, a side plate, a top plate and reinforcing angle steel.
6. The energy-saving corrosion-resistant efficient heat exchange device according to claim 5, wherein: an inspection door is arranged on a side plate of the phase change heat exchange shell.
7. The energy-saving corrosion-resistant efficient heat exchange device according to claim 1, characterized in that: and the smoke facing surface of each heat exchange finned tube in the first row of phase change heat exchange fins in the phase change heat absorption module along the gas flowing direction is provided with an anti-abrasion tile.
8. The energy-saving corrosion-resistant efficient heat exchange device according to claim 7, wherein: the specific mounting structure of the wear tile includes: the inner side of the anti-abrasion tile is provided with a clip with a U-shaped bayonet, and the anti-abrasion tile is detachably mounted on the heat exchange finned tube by buckling the U-shaped bayonet of the clip on the heat exchange finned tube.
9. The energy-saving corrosion-resistant efficient heat exchange device according to claim 1, characterized in that: and the gas facing side of each phase-change heat exchange module is provided with a guide plate for guiding gas to flow to the phase-change heat exchange fins.
10. The energy-saving corrosion-resistant efficient heat exchange device according to claim 1, characterized in that: and the outer parts of the upper communicating pipe and the lower communicating pipe in each phase-change heat exchange module are respectively provided with a collecting pipe protecting plate for protecting the corresponding communicating pipe.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111678165A (en) * | 2020-06-12 | 2020-09-18 | 江苏龙净节能科技有限公司 | Energy-saving corrosion-resistant efficient heat exchange device |
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| CN111678165A (en) * | 2020-06-12 | 2020-09-18 | 江苏龙净节能科技有限公司 | Energy-saving corrosion-resistant efficient heat exchange device |
| CN111678165B (en) * | 2020-06-12 | 2024-08-06 | 江苏龙净节能科技有限公司 | Energy-saving corrosion-resistant efficient heat exchange device |
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