CN113531902B - Energy-saving method for auxiliary heating by using compression latent heat and sensible heat of overpressure saturated water - Google Patents
Energy-saving method for auxiliary heating by using compression latent heat and sensible heat of overpressure saturated water Download PDFInfo
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- CN113531902B CN113531902B CN202110501359.7A CN202110501359A CN113531902B CN 113531902 B CN113531902 B CN 113531902B CN 202110501359 A CN202110501359 A CN 202110501359A CN 113531902 B CN113531902 B CN 113531902B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H6/00—Combined water and air heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
Abstract
The invention discloses an energy-saving method for auxiliary heating by using the compression latent heat and the sensible heat of overpressure saturated water, which comprises the following steps: heating water in the shell pass of the heat exchanger by a steam heater or directly heating water-soluble hydrolysis materials in a heating container to obtain a mixture of saturated water and saturated steam; and then, the air pressurizing heat pump is used for pressurizing to form overpressure saturated water, and saturated steam generated by heating and overpressure of the overpressure saturated water heat source is converted into saturated water to release the sum of latent heat of compression of phase change and sensible heat of compression generated by compressed air for auxiliary heating. The invention cancels a temperature difference heating method of a circulating pump of saturated water, utilizes the sum of phase change latent heat released by the saturated water formed by compressing saturated steam of an air heat pump and compression sensible heat generated by compressed air to carry out auxiliary heating on steam, cancels the circulating heating of the circulating pump compared with a method of circulating heating of the saturated water, does not need to exhaust air, and has simple system and obvious energy saving.
Description
Technical Field
The invention relates to the field of heating of overpressure saturated water, in particular to an energy-saving method for performing auxiliary heating by using the latent heat of compression and the sensible heat of the overpressure saturated water.
Background
In the 'saturated water circulation heating method' disclosed in the Chinese invention patent ZL201610430580.7, an electric heater, a pump and user equipment form a closed circulation heating system. The electric energy consumed in the heating process is the sum of the electric energy consumed by the preheating heating of the electric heater and the circulating temperature difference heating and the energy consumed by the pump motor.
Whole closed system will thoroughly exhaust the air, including dissolved air and free air, if the aquatic has the air can cause the gas corrosion of circulating pump, shortens the life of circulating pump.
The air exhaust time of the system is long, and the closed exhaust system is complex. The circulating pump requires that the sealing part is resistant to high temperature and high pressure under the condition of long-term saturated water high-temperature and high-pressure circulating work, the quality of the circulating pump is high, the circulating pump is frequently damaged, and the maintenance task is heavy.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an energy saving method for auxiliary heating using the latent heat of compression and the sensible heat of overpressure saturated water. By forming the overpressure saturated water heating method, exhaust is not needed, a circulating pump is omitted, the maintenance requirement is reduced, and the energy-saving effect is improved.
In order to realize the purpose of the invention, the adopted technical scheme is as follows:
an energy-saving method for auxiliary heating by using the latent heat and the sensible heat of compression of overpressure saturated water comprises the following steps:
(1) Firstly, supplying water to the shell pass of the heat exchanger to 70-90% of the volume by the height difference of a high-level water tank, opening a steam valve of a steam heater to heat the water in the shell pass of the heat exchanger to the upper limit of the temperature, and forming a mixture of saturated water and saturated steam at the same temperature;
simultaneously, waste heat steam is discharged through a steam discharge valve and enters a high-level water tank to recover waste heat, the temperature of water in the water tank is increased, and the temperature difference between the upper limit temperature and the lower limit temperature of the mixture temperature of saturated water and saturated steam with the same temperature is set to be 10-30 ℃;
a heating coil of the user equipment, a tube pass of the overpressure saturated water heat exchanger and an air heat pump form a heated system;
(2) Opening an air pressurizing heat pump to repressurize a mixture of saturated water and saturated steam in a shell pass of the heat exchanger, and when the pressure exceeds the set associated pressure of the saturated water and the saturated steam and is repressurized by 0.2-0.5 Mpa, compressing the saturated steam into saturated water to generate latent heat of compression phase change and sensible heat of compressed air as an auxiliary heat source for heating by temperature difference;
(3) Opening a valve of a coil pipe of the heat-using equipment, and when heated water or materials enter a pipe pass of the heat exchanger and are indirectly heated to the upper limit of the set temperature, the heated water or materials can be discharged intermittently, fed continuously or discharged continuously;
(4) When the tube pass heated water or materials are reduced to a set lower limit temperature, the temperature of the shell pass compressed air and the overpressure saturated water is reduced to a set lower limit temperature, the pressure is correspondingly reduced at the moment, when a shell pass steam release valve is automatically opened to reduce the pressure to a set lower limit pressure, the steam heater is opened to heat the water to the set upper limit temperature by steam, the steam heater is closed, the air pressurizing heat pump is automatically opened to automatically pressurize the water to a corresponding upper limit pressure and then pressurize the water to 0.2-0.5 Mpa, and the latent heat of compression and the sensible heat generated by the mixture of the overpressure saturated water and the compressed air are utilized to perform auxiliary heating.
This is one of the solutions of the present invention.
In a preferred embodiment of the invention, the step (1) is replaced by directly heating the water-soluble hydrolysis material in the heating container to a set upper limit temperature by using a steam heater to form a saturated water material, then directly pressurizing to a corresponding upper limit pressure by using a pressurized air heat pump, and then pressurizing by 0.2Mpa-0.5Mpa to form a mixture of the hydrolysis material of the overpressure saturated water and the compressed air, and when the temperature of the compressed air and the overpressure saturated water in the container is reduced to a lower limit temperature, opening an air valve to stop when the pressure in the container is reduced to the lower limit pressure corresponding to the lower limit temperature; opening a valve of a steam heater, heating to the upper temperature limit, and closing to form a mixture of saturated water material and saturated steam with the same temperature;
opening the air pressurizing heat pump to pressurize to the upper limit pressure corresponding to the upper limit temperature, and then increasing 0.2Mpa-0.5Mpa to form a mixture of overpressure saturated water and compressed air.
The auxiliary heat source which utilizes the latent heat of phase change generated by the saturated steam compressed into saturated water and the sensible heat of compressed air for heating together can keep the temperature in the inner container unchanged for 2 hours, and compared with the direct circulating heating of the saturated water, the auxiliary heat source does not pressurize, prolongs 1 hour, and obviously saves energy.
This is the second embodiment of the present invention.
In a preferred embodiment of the invention, the heat exchanger is a finned heat exchanger, wherein the coiled pipe of the finned heat exchanger is heated to a set upper limit temperature by steam after 70% -90% of water in the coiled pipe is added, and then the coiled pipe is pressurized to a corresponding upper limit pressure by an air pressurizing heat pump and then pressurized to 0.2-0.5 Mpa.
When a fan is turned on and air is heated to a set upper temperature limit by using fins and is reduced to a lower temperature limit, the temperature difference between the upper temperature limit and the lower temperature limit is 10-30 ℃, overpressure saturated water and compressed air are also reduced to a set lower limit temperature, a coiled pipe valve is turned on to deflate and reduce the pressure to a corresponding lower limit pressure, then the air is heated to the set upper limit temperature by steam, the air is pressurized to the corresponding upper limit pressure by an air pressurization heat pump and then pressurized by 0.2-0.5 Mpa, a mixture of the overpressure saturated water and the compressed air is formed, and simultaneously, an auxiliary heat source of phase change latent heat and sensible heat is formed to continuously heat the air by fin heat release.
This is the third solution of the present invention.
In a preferred embodiment of the present invention, the steam heater is one of an electric heating steam heater, a gas heating steam heater, and an oil heating steam heater.
In a preferred embodiment of the invention, the air pressurizing heat pump is a structure for increasing the exhaust temperature of a reciprocating piston type air compressor, which is disclosed in the invention patent ZL202020126412.0 in China.
In a preferred embodiment of the present invention, the temperature difference between the upper limit temperature and the lower limit temperature is 10 to 30 ℃, and the pressure difference after re-pressurization by the air pressurization heat pump is 0.2 to 0.5Mpa based on the corresponding upper limit pressure.
The invention has the beneficial effects that:
compared with the method of utilizing the saturated water for circulating heating, the energy-saving method has the advantages that the circulating heating of the circulating pump is cancelled, the air pump is not used for exhausting air, and the system is simple and obviously saves energy compared with the method of utilizing the circulating pump for circulating heating of the saturated water in the prior art.
Drawings
Fig. 1 is a first structural schematic diagram of the present invention.
Fig. 2 is a second structural schematic diagram of the present invention.
Fig. 3 is a third structural schematic diagram of the present invention.
Detailed Description
The auxiliary heating system for forming latent heat and sensible heat of compression used in the energy saving method for auxiliary heating using latent heat and sensible heat of compression of saturated water as shown in fig. 1-3 comprises a heat apparatus 100, and a steam heater 300 and an air pressurizing heat pump 400 connected to the heat apparatus 100, wherein the steam heater 300 outputs steam to the heat apparatus 100 to heat water in the heat apparatus 100 to form a mixture of saturated water and saturated steam; the air-pressurized heat pump 400 pressurizes a mixture of saturated water and saturated steam in the heat facility 100 to generate latent heat of compression and sensible heat to be converted into a mixture of pressurized air and over-pressurized saturated water as an auxiliary heat source for differential heating.
The steam heater 300 is one of an electric heating steam heater, a gas heating steam heater, and a fuel heating steam heater. The air pressurizing heat pump 400 is a structure for improving the exhaust temperature of a reciprocating piston type air compressor, which is disclosed in Chinese invention patent ZL 202020126412.0. The pressure corresponding to the set upper limit temperature and the pressure difference after re-pressurization by the air pressurizing heat pump 400 are 0.5Mpa.
It is emphasized that, as shown in fig. 1, the thermal equipment 100 is an oversaturated water heat exchanger, a shell pass and a tube pass (not shown in the figure) are arranged in the oversaturated water heat exchanger, and a pressurized heated air inlet 101 and a steam inlet 102 are arranged on the shell pass of the oversaturated water heat exchanger; the steam inlet 102 on the shell side of the overpressure saturated water heat exchanger is connected with the steam outlet 301 of the steam heater 300 through the steam pipeline 110 and the steam valve 111; the pressurized heated air inlet 101 on the shell side of the supersaturated water heat exchanger is connected to the air pressurized heat pump 400 by a pressurized heated air delivery conduit 120 and an air valve 121.
A water inlet 103 and a waste heat steam outlet 104 are arranged on the shell pass of the overpressure saturated water heat exchanger, two water outlets 201 and 202 and a waste heat steam recovery port 203 are arranged on the water tank 200, the water outlet 201 on the water tank 200 is connected with the water inlet 103 on the shell pass of the overpressure saturated water heat exchanger through a first water conveying pipe 210 and a first water conveying valve 211, and the other water outlet 202 on the water tank 200 is connected with a water inlet 302 on the steam heater 300 through a second water conveying pipe 220 and a second water conveying valve 221; the waste heat steam recovery port 203 on the water tank 200 is connected with the waste heat steam outlet 104 on the shell side of the overpressure saturated water heat exchanger through a waste heat steam recovery pipe 230 and a waste heat steam valve 231. The tube side of the pressure saturation water heat exchanger is provided with a heated medium inlet 105 and a heated medium outlet 106, and the heating medium inlet 105 and the heated medium outlet 106 are circularly connected with the heat utilization equipment 500 through a heat utilization pipeline 110 and an air heat pump 111.
The valves of the heat utilization equipment 500 and the air heat pump 111 are opened, so that the water or the material to be heated in the heat utilization equipment 500 enters the tube pass (not shown in the figure) of the overpressure saturated water heat exchanger 100 to be indirectly heated to the lower limit temperature, and then the water or the material is discharged to the discharging tank 600 of the heated water or the material.
When the tube side (not shown) of the overpressure saturated water heat exchanger 100 is cooled to the set lower limit temperature of 80 ℃ by heat exchange with the heated water or material introduced into the heat utilization equipment 500, the temperature of the pressurized air and the saturated water in the shell side (not shown) of the overpressure saturated water heat exchanger 100 is reduced to the set lower limit temperature of 130 ℃, and the pressure is also reduced.
When the pressure of the shell side (not shown) of the overpressure saturated water heat exchanger 100 is reduced to 0.3Mpa by a vent valve, the valve of the steam heater 300 is opened to perform ventilation operation, saturated water is formed when the temperature is heated to the set upper limit temperature of 150 ℃ by steam, and at the moment, the heating is only required to be carried out for 20 minutes and then the device is shut down.
Then, the air pressurizing heat pump 400 is opened to pressurize to the set upper limit temperature and the upper limit pressure of 0.5Mpa and then to pressurize to 0.8Mpa, only 2 minutes are needed at the moment, saturated steam generated by heating by an overpressure saturated water heat source and overpressure is converted into saturated water to release compression latent heat and sensible heat of phase change for auxiliary heating, and the energy consumption of the heat energy is 22 percent less than that of the pure saturated water circulation heating when the temperature difference between the upper limit temperature of 150 ℃ and the lower limit temperature of 130 ℃ is 20 ℃ which is set under the same condition.
Embodiment 2 as shown in fig. 2, the thermal equipment in the figure is a water-soluble material hydrolysis tank 10, a pressurized hot air inlet 11, a steam inlet 12 and a discharge port 13 are arranged on the water-soluble material hydrolysis tank 10, and a discharge tank 14 is further connected to the discharge port 13.
A steam inlet 12 on the water-soluble material hydrolysis tank 10 is connected with a steam outlet 31 of a steam heater 30 through a steam pipeline 20 and a steam valve 21; the pressurized and heated air inlet 11 on the water-soluble material hydrolysis tank 10 is connected with an air pressurized and heated heat pump 50 through a pressurized and heated air conveying pipeline 40 and an air valve 41.
Firstly, water accounting for 80 percent of the volume is injected into the water-soluble material hydrolysis tank 10, and then the water-soluble material hydrolysis tank is utilizedThe steam temperature of the steam heater 30 is 150 ℃,0.2m 3 The steam amount of (1) is directly to 1m of the water-soluble material hydrolysis tank 10 3 Heating the material containing 90% water with steam, heating for 30 min until the material temperature in the water-soluble material hydrolysis tank 10 reaches the set saturated water at 130 deg.C, stopping heating until the corresponding pressure reaches 0.3Mpa, directly pressurizing to 0.9Mpa with the air pressurizing heat pump 50, and stopping heating for 2 min.
The temperature of the materials in the whole water and water-soluble material hydrolysis tank 10 is kept to be not reduced at 130 ℃ for 2 hours in the whole hydrolysis process, and heat energy is not consumed any more. Compared with the saturated water circulation indirect heating, the energy is saved by 26 percent.
Embodiment 3 as shown in fig. 3, the thermal device in the figure is an overpressure saturated water fin type heat exchanger 60, a coiled pipe (not shown in the figure) is arranged in the overpressure saturated water fin type heat exchanger 60, a pressurized heating air inlet 61 and a steam inlet 62 are arranged on the coiled pipe, and the steam inlet 62 is connected with a steam outlet 81 of a steam heater 80 through a steam pipeline 70 and a steam valve 71; the pressurized heated air inlet 61 on the serpentine is connected to an air pressurized heat pump 93 through a pressurized heated air delivery conduit 90 and an air valve 91. Further, a purge valve (not shown) is provided in the serpentine pipe.
An air inlet 63 and an air outlet 64 are arranged on the shell of the overpressure saturated water fin type heat exchanger 60, a fan 67 is connected to the air inlet 63 through an air inlet pipe 65 and an air inlet valve 66, and ambient temperature air sent from the air inlet 63 is heated through a coil pipe in the overpressure saturated water fin type heat exchanger 60 through fins, and then hot air is sent out from the air outlet 64.
When 80% of the volume of water is injected into the serpentine tubes in the overpressure saturated water fin heat exchanger 60 and the water in the serpentine tubes in the overpressure saturated water fin heat exchanger 60 is heated by the steam from the steam heater 80 to an upper temperature of 150 ℃, a mixture of saturated water and saturated steam is formed, and the heating takes only 20 minutes and then is stopped.
The air pressurizing heat pump 93 is started to perform pressurizing operation for 2 minutes, the pressure in the serpentine pipe is increased to 0.9Mpa, saturated steam in the serpentine pipe is converted into saturated water to generate the sum of phase-change compression latent heat and compression sensible heat generated by air compression, the sum serves as an auxiliary heat source, the fan 67 is started to perform heat releasing operation through the saturated water fin type heat exchanger 60, air blowing is performed through the fan 67, the ambient air temperature is increased to 100 ℃ from 25 ℃ of ambient temperature, the interval time of steam heating in the scheme is 32 minutes, and the energy is saved by 22 percent compared with that of pure saturated water circulation heating.
In summary, the energy consumed by the invention comprises the sum of the heat energy heated by steam and the electric energy of the driving motor pressurized by the air heat pump, and is obviously energy-saving compared with the prior art that the preheating heating of saturated water and the continuous temperature difference heating of the saturated water by using the pump circulation are compared with the sum of the electric energy consumed by the pump.
Having thus described the basic principles of the present invention, its principal features and advantages, the present invention is not limited by the foregoing embodiments, but is susceptible to various changes and modifications without departing from the principles and scope of application, which are intended to be covered by the appended claims and their equivalents.
Claims (2)
1. An energy-saving method for auxiliary heating by using the latent heat and the sensible heat of compression of overpressure saturated water is characterized by comprising the following steps:
(1) Directly heating the water-soluble hydrolysis material in the heating container to a set upper limit temperature by using a steam heater to form saturated water, then directly pressurizing to a corresponding upper limit pressure by using a pressurized air heat pump, and then pressurizing by 0.2-0.5 Mpa to form a mixture of the hydrolysis material of the overpressure saturated water and compressed air, and when the temperature of the compressed air and the overpressure saturated water in the container is reduced to a lower limit temperature, opening an air valve to enable the pressure in the container to be reduced to the lower limit pressure corresponding to the lower limit temperature and then shutting down; opening a valve of the steam heater, and stopping when the temperature is heated to the upper limit; opening an air pressurizing heat pump to pressurize to the upper limit pressure corresponding to the upper limit temperature, and then pressurizing to 0.2-0.5 Mpa;
(2) Opening an air pressurizing heat pump to repressurize a mixture of saturated water and saturated steam in a shell pass of the heat exchanger, and generating latent heat of compression and sensible heat as an auxiliary heat source for heating by temperature difference when the pressure exceeds the set associated pressure of the saturated water and the saturated steam and is repressurized by 0.2-0.5 MPa;
(3) Opening a valve of a coil pipe of the heat-using equipment to ensure that when the heated water or material enters a pipe pass of the heat exchanger and is indirectly heated to the upper limit of the set temperature, the heated water or material can be discharged discontinuously, fed continuously or discharged continuously;
(4) When the temperature of the shell pass compressed air and the overpressure saturated water is reduced to the set lower limit temperature when the tube pass heated water or materials are reduced to the set lower limit temperature, the pressure is correspondingly reduced at the moment, when a shell pass steam release valve is automatically opened to reduce the pressure to the set lower limit pressure, the steam heater is opened to heat the water to the set upper limit temperature by steam, the steam heater is turned off, the air pressurizing heat pump is automatically opened to automatically pressurize the water to the corresponding upper limit pressure and then pressurize the water to 0.2-0.5 Mpa, and the auxiliary heating is carried out by utilizing the compression latent heat and the sensible heat generated by the mixture of the overpressure saturated water and the compressed air.
2. An energy saving method of auxiliary heating using the latent heat of compression and sensible heat of overpressure saturated water as claimed in claim 1, wherein said steam heater is one of an electric heating steam heater, a gas heating steam heater, and an oil heating steam heater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110501359.7A CN113531902B (en) | 2021-05-08 | 2021-05-08 | Energy-saving method for auxiliary heating by using compression latent heat and sensible heat of overpressure saturated water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110501359.7A CN113531902B (en) | 2021-05-08 | 2021-05-08 | Energy-saving method for auxiliary heating by using compression latent heat and sensible heat of overpressure saturated water |
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| CN113531902B true CN113531902B (en) | 2023-04-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102353061A (en) * | 2011-08-19 | 2012-02-15 | 宁波互联聚能环保技术有限公司 | System and method for comprehensively utilizing sludge drying and burning waste heats stepwise |
| KR101719067B1 (en) * | 2015-07-24 | 2017-03-22 | 선테코 유한회사 | Distillation system and distillating method thereof |
| CN106066091B (en) * | 2016-06-16 | 2019-07-16 | 刘文治 | Saturated water circular heating method |
| CN206009402U (en) * | 2016-08-26 | 2017-03-15 | 宁波宝硕美机械设备工程有限公司 | A kind of low temperature pressurized hydrolysis tank |
| CN106969337B (en) * | 2017-04-14 | 2022-07-08 | 中国科学院广州能源研究所 | Heat pump steam unit |
| CN109827357A (en) * | 2019-02-01 | 2019-05-31 | 刘文治 | A kind of novel air heat pump |
| CN212109069U (en) * | 2020-01-20 | 2020-12-08 | 刘文治 | Structure for improving exhaust temperature of reciprocating piston air compressor |
| CN111436535A (en) * | 2020-03-24 | 2020-07-24 | 刘文治 | Method for producing feed raw material by hydrolyzing wet bean dregs |
| CN215892760U (en) * | 2021-04-14 | 2022-02-22 | 刘文治 | Compression latent heat auxiliary heating system utilizing overpressure saturated water |
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