CN113432104A - Energy-saving system and method for electric steam boiler with condensed water circulation - Google Patents

Energy-saving system and method for electric steam boiler with condensed water circulation Download PDF

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Publication number
CN113432104A
CN113432104A CN202110852046.6A CN202110852046A CN113432104A CN 113432104 A CN113432104 A CN 113432104A CN 202110852046 A CN202110852046 A CN 202110852046A CN 113432104 A CN113432104 A CN 113432104A
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CN
China
Prior art keywords
steam
electric
energy
steam boiler
condensate
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Withdrawn
Application number
CN202110852046.6A
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Chinese (zh)
Inventor
马冰
梁家馨
王博
朱昭勖
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Shandong Renbo Energy Technology Co ltd
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Shandong Renbo Energy Technology Co ltd
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Publication of CN113432104A publication Critical patent/CN113432104A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
    • F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler

Abstract

The invention relates to an energy-saving system and method of an electric steam boiler with condensed water circulation, belonging to the technical field of energy conservation, wherein the system comprises a heat utilization device, a flash evaporator, a preheating energy saver, the electric steam boiler and an injection type pressure mixer; the steam condensate generated by the heat equipment is divided into two paths, the first path is connected with the flash evaporator through a throttle valve, and the second path is communicated with the electric steam boiler through a water pump; the flash evaporator is communicated with the preheating energy saver; a condenser capable of radiating heat is arranged in the preheating energy saver; the electric steam boiler is communicated with a power steam port of the jet type pressure mixer; the flash evaporator and the preheating energy saver are respectively communicated with an injection steam port of the injection type pressure mixer; the steam outlet of the jet pressure mixer is connected with a heat utilization device. Under the general working condition, the system can obtain about 6 percent of energy-saving benefit, can save a large amount of electric energy after long-term operation, and has remarkable economic benefit.

Description

Energy-saving system and method for electric steam boiler with condensed water circulation
Technical Field
The disclosure belongs to the technical field of energy conservation, and particularly relates to an energy-saving system and method for an electric steam boiler with condensed water circulation.
Background
The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.
Because of environmental protection, small coal-fired and gas-fired boilers gradually replace heat pumps or electric boilers, particularly in the industrial field needing steam, and the electric steam boilers are the most reliable and convenient devices.
However, the electric boiler consumes high-grade energy, produces low-pressure steam with relatively low grade, does not achieve temperature contra-aperture and cascade utilization, and although the conversion efficiency can be close to 100%, the irreversible loss is large, the economy is not high, and the improvement of the utilization efficiency is urgently needed.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides an energy-saving system and method for an electric steam boiler with condensed water circulation, wherein under the common working condition, the system can obtain about 6% of energy-saving benefit, can save a large amount of electric energy after long-term operation, and has remarkable economic benefit.
At least one embodiment of the present disclosure provides an energy saving system of an electric steam boiler with condensed water circulation, which includes a heat utilization device, a flash evaporator, a preheating energy saver, the electric steam boiler and an injection type pressure mixer;
the steam condensate generated by the heat equipment is divided into two paths, the first path is connected with the flash evaporator through a throttle valve, and the second path is communicated with the electric steam boiler through a water pump; the flash evaporator is communicated with the preheating energy saver; a condenser is arranged in the preheating energy saver and can radiate heat to the liquid immersed on the outer surface of the condenser; the electric steam boiler is communicated with a power steam port of the jet type pressure mixer; the flash evaporator and the preheating energy saver are respectively communicated with an injection steam port of the injection type pressure mixer; the steam outlet of the jet pressure mixer is connected with a heat utilization device.
Further, a steam pocket is arranged between the jet type pressure mixer and the heat utilization equipment.
Furthermore, the inlet of the condenser is connected with the compressor, and the outlet of the condenser is connected with the air-source heat pump evaporator through the expansion valve; the air energy heat pump evaporator is connected with the compressor.
Further, a refrigerant flows through the condenser.
Further, the electric steam boiler is provided with an electric heater.
Further, the bottom of the flash evaporator is communicated with the preheating energy saver through a first pipeline.
Furthermore, the top end of the electric steam boiler is communicated with the power steam port of the jet pressure mixer through a second pipeline.
Furthermore, the heat dissipation temperature of the condenser is slightly higher than the saturated condensate temperature entering the preheater, and the saturated condensate is heated while heat dissipation is carried out, so that the saturated condensate is vaporized into steam under the condition of unchanged temperature.
At least one embodiment of the present disclosure further provides an energy saving method of an energy saving system of an electric steam boiler based on any one of the above embodiments, the method includes the following processes:
a first part of steam condensate generated by heat equipment is pressurized by a water pump and flows back to an electric steam boiler to be heated to form high-pressure steam, and the high-pressure steam enters a power steam port of the jet type pressure mixer;
and a second part of steam condensate generated by heat equipment enters a flash evaporator through a throttle valve to be subjected to low-pressure gasification to form negative pressure steam and negative pressure saturated condensate, the negative pressure saturated condensate is sent to a preheating energy saver to be subjected to low-pressure gasification again to form negative pressure steam, the negative pressure steam in the flash evaporator and the preheater is sent to an injection steam port of an injection type pressure mixer to form mixed steam in the injection type pressure mixer, and finally the mixed steam is sent to the heat equipment.
Further, the mixed steam is fed into a steam drum.
The embodiment disclosed above achieves the following advantages:
part of steam condensate water generated by electric equipment of the energy-saving system of the electric steam boiler disclosed by the invention enters a flash evaporator for low-pressure vaporization, and simultaneously, the non-vaporized condensate water enters a preheating energy saver for low-pressure vaporization; the other part of the steam condensate generated by the electric equipment enters the electric steam boiler to form saturated steam, and negative pressure steam generated in the jet type pressure mixer, the flash evaporator and the preheating energy saver is mixed to form mixed steam, so that about 6 percent of energy-saving benefit can be obtained, a large amount of electric energy can be saved after long-term operation, and the economic benefit is remarkable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a structural diagram of an energy saving system of an electric steam boiler with condensed water circulation according to an embodiment of the present disclosure.
In the figure: 1. steam condensate, 2, a throttle valve, 3, a flash evaporator, 4, a preheating economizer, 5, a liquid water interface, 6, negative pressure steam, 7, a condenser of an air energy heat pump, 8, a water pump, 9, an electric steam boiler, 10, an electric heater, 11, a liquid water interface, 12, high pressure steam, 13, power steam, 14, an injection type pressure mixer, 15, a steam packet, 16, a heat utilization device, 17, a refrigerant, 18, an air energy heat pump evaporator, 19, a compressor, 20 and an expansion valve.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
In the description of the present disclosure, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure.
As shown in fig. 1, the embodiment of the present disclosure provides a condensate-circulating energy saving system for an electric steam boiler, which mainly includes a heat utilization device 16, a flash evaporator 3, a preheating energy saver 4, an electric steam boiler 9 and an injection pressure mixer 14.
The steam condensate 1 generated by the heat utilization equipment 16 is divided into two paths, namely a first path and a second path.
The first outlet is connected with an electric steam boiler 9 through a water pump 8 and is used for boosting and conveying a part of steam condensate generated by the heat utilization equipment to the electric steam boiler, and the part of steam condensate is shown as a liquid water interface 11 in fig. 1.
Further, the electric steam boiler of the present embodiment is provided with an electric heater 10 by which steam condensate flowing into the boiler is heated to generate high pressure steam 12 as motive steam 13, and the top of the electric steam boiler is communicated with a motive steam port a at the right end of the jet pressure mixer through a first pipe, so that the high pressure steam generated by the electric heater can enter the jet pressure mixer.
The second outlet is connected with the flash evaporator 3 through the throttle valve 2 and is used for cooling and reducing the pressure of steam condensate under high temperature and high pressure, one part of the steam condensate is vaporized under low pressure to form negative pressure steam 6, the other part of the steam condensate is cooled to be negative pressure saturated condensate, the liquid water interface 5 in the figure 1 is shown in the other part of the condensate, the bottom of the flash evaporator 3 is communicated with the preheating energy saver 4 through a second pipeline, so that the saturated condensate can automatically flow to the preheating energy saver, the liquid water interface 5 in the figure 1 is shown in the other part of the condensate, and a condenser 7 of an air energy heat pump is arranged in the preheating energy saver.
The condenser 7 of the air energy heat pump, the expansion valve 20 outside the preheating economizer, the air energy heat pump evaporator 18 and the air compressor 19 form an air energy heat pump system, a refrigerant 17 circulates in the air energy heat pump system, and the air energy heat pump system can provide heat of about 55 ℃ for the preheating economizer to vaporize low pressure saturated condensate flowing into the preheating economizer to form negative pressure steam 6.
Further, the top ends of the flash evaporator and the preheating economizer are connected with an injection steam port b on the outer wall of the injection type pressure mixer through a pipeline, and the top ends of the flash evaporator and the preheating economizer are used for conveying negative pressure saturated steam 6 generated in the flash evaporator and the preheating economizer into the injection type pressure mixer 14 to form mixed steam with high pressure saturated steam generated by the electric steam boiler, and low-parameter steam required by a user is obtained under the injection effect of the high pressure steam entering the pressure mixer, and finally enters a steam packet 15 through a mixed steam outlet c to be used by the heat equipment 12.
The working principle of the energy-saving system of the electric steam boiler without the condensed water circulation is as follows:
steam condensate 1 enters a flash evaporator 3 through a throttle valve 2, one part of the steam condensate is vaporized under low pressure, and the other part of the steam condensate is cooled to be saturated condensate; the refrigerant 17 is used as a working medium, 18, 19, 7 and 20 form an air energy heat pump system, a small part of electric energy is consumed, heat energy is absorbed from air, and heat at about 55 ℃ is provided in a 4-preheating energy saver for low-pressure vaporization of saturated condensate water; a9 electric steam boiler generates high-parameter saturated steam (for example, more than 0.6MPa) as 13 power steam through an electric heater 10, 6 negative pressure steam can be generated in a 4 preheating energy saver through a 14 pressure mixer, a b injection steam port is sucked, and mixed steam is finally formed, so that low-parameter steam (for example, more than 0.4MPa) meeting the requirements of users is obtained.
In addition, the present disclosure also provides an energy saving method of the energy saving system of the electric steam boiler, which mainly comprises the following steps: a first part of steam condensate generated by heat equipment is pressurized by a water pump and flows back to an electric steam boiler to be heated to form high-pressure steam, and the high-pressure steam enters a power steam port of the jet type pressure mixer;
and a second part of steam condensate generated by thermal equipment enters a flash evaporator through a throttle valve to be subjected to low-pressure gasification to form negative pressure steam and negative pressure saturated condensate, the negative pressure saturated condensate is sent to a preheating energy saver to be subjected to low-pressure gasification again to form negative pressure steam, the negative pressure steam in the flash evaporator and a preheater is sent to an injection steam port of an injection type pressure mixer to form mixed steam in the injection type pressure mixer, and finally the mixed steam is sent to a steam packet for use by electric equipment.
Energy conversion is carried out using the steam condensate (temperature 85 ℃, pressure 0.35MPa, enthalpy 343.02kJ/kg, total flow 0.0111kg/s) produced by the thermal plant 16 as an example:
wherein 0.01kg/s of the steam condensate is pressurized to 1.0MPa by a water pump 8 and then flows back to an electric steam boiler 9, and the electric power should not exceed 0.2 kW; in addition, 0.0011kg/s enters a flash evaporator 3 through a throttle valve 2, the internal pressure of the flash evaporator is negative, the pressure is 0.016MPa, 5% of vaporization is carried out, 95% of the condensed water is saturated and condensed at 55 ℃, the condensed water flows to a preheating energy saver 4 automatically, the vapor is negative pressure steam 6 under the condition that a heat pump condenser 7 continuously supplies heat, the saturated steam pressure is 0.016MPa, the heating power of the heat pump condenser is 2.61kW, and the consumed electric power of a heat pump compressor is 0.87kW according to the heating COP of the heat pump which is 3.0. In addition, the condensed water which enters the electric steam boiler 9 and is at the temperature of 85 ℃ and 1.0MPa is heated to 180 ℃ and becomes saturated steam, namely the power steam 13, the enthalpy value is 2777.1kJ/kg, and the consumed electric power is 24.34 kW. The superheated steam with the temperature of 0.4MPa and the temperature of 153 ℃ is obtained by injecting the power steam with the temperature of 180 ℃ and the pressure of 1.0MPa into the power steam with the temperature of 55 ℃ and the pressure of 0.016MPa, and the injection coefficient is 0.11, namely the power steam is 0.01kg/s, the pressure of 0.0011kg/s and the mixed steam is 0.0111kg/s, namely the flow of the regeneration steam entering the steam bag 15 is 0.0111 kg/s. The total power consumption from water condensation to steam regeneration is 25.41 kW. If a steam boiler is used for directly generating steam with 0.4MPa and 153 ℃ from reflux condensate water with the temperature of 85 ℃, the electric power is 27.02kW, including the power of a water pump, so that the invention can save 1.61kW of electric energy, and the energy saving rate is 6.0%. The energy consumption of the system is influenced by the environment temperature, is different in winter and summer, but has a good energy-saving effect, and is suitable for most areas in China except for being not suitable for some areas with severe cold.
Therefore, the energy-saving system and the method for the electric steam boiler with the condensed water circulation can obtain about 6% of energy-saving benefit under common working conditions, and can save a large amount of electric energy and economic benefit after long-term operation.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.

Claims (10)

1. The utility model provides a congeal hydrologic cycle's electric steam boiler economizer system which characterized in that: comprises heat utilization equipment, a flash evaporator, a preheating energy saver, an electric steam boiler and a jet type pressure mixer;
the steam condensate generated by the heat equipment is divided into two paths, the first path is connected with the flash evaporator through a throttle valve, and the second path is communicated with the electric steam boiler through a water pump; the flash evaporator is communicated with the preheating energy saver; a condenser with the surface capable of dissipating heat is arranged in the preheating energy saver; the electric steam boiler is communicated with a power steam port of the jet type pressure mixer; the flash evaporator and the preheating energy saver are respectively communicated with an injection steam port of the injection type pressure mixer; the steam outlet of the jet pressure mixer is connected with a heat utilization device.
2. An energy saving system for an electric steam boiler with condensate water circulation as claimed in claim 1, wherein: a steam pocket is arranged between the jet type pressure mixer and the heat utilization equipment.
3. An energy saving system for an electric steam boiler with condensate water circulation as claimed in claim 1, wherein: the inlet of the condenser is connected with the compressor, and the outlet of the condenser is connected with the air energy heat pump evaporator through the expansion valve; the air energy heat pump evaporator is connected with the compressor.
4. A condensate-circulating electric steam boiler economizer system as claimed in claim 2, wherein: the condenser is circulated with a refrigerant.
5. An energy saving system for an electric steam boiler with condensate water circulation as claimed in claim 1, wherein: the electric steam boiler is provided with an electric heater.
6. An energy saving system for an electric steam boiler with condensate water circulation as claimed in claim 1, wherein: the bottom of the flash evaporator is communicated with the preheating energy saver through a first pipeline.
7. An energy saving system for an electric steam boiler with condensate water circulation as claimed in claim 1, wherein: the top end of the electric steam boiler is communicated with a power steam port of the jet pressure mixer through a second pipeline.
8. An energy saving system for an electric steam boiler with condensate water circulation as claimed in claim 1, wherein: the heat radiation temperature of the condenser is higher than the saturated condensate temperature entering the preheater, and the saturated condensate is heated while the heat radiation is carried out, so that the saturated condensate is vaporized into steam under the condition of unchanged temperature.
9. The energy-saving method of the energy-saving system of the electric steam boiler based on the condensate water circulation of any one of claims 1 to 8, is characterized in that;
a first part of steam condensate generated by heat equipment is pressurized by a water pump and flows back to an electric steam boiler to be heated to form high-pressure steam, and the high-pressure steam enters a power steam port of the jet type pressure mixer;
and a second part of steam condensate generated by heat equipment enters a flash evaporator through a throttle valve to be subjected to low-pressure gasification to form negative pressure steam and negative pressure saturated condensate, the negative pressure saturated condensate is sent to a preheating energy saver to be subjected to low-pressure gasification again to form negative pressure steam, the negative pressure steam in the flash evaporator and the preheater is sent to an injection steam port of an injection type pressure mixer to form mixed steam in the injection type pressure mixer, and finally the mixed steam is sent to the heat equipment.
10. The energy saving method of claim 9, wherein: feeding the mixed steam into a steam drum.
CN202110852046.6A 2020-08-12 2021-07-27 Energy-saving system and method for electric steam boiler with condensed water circulation Withdrawn CN113432104A (en)

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CN202010808207.7A CN111928223A (en) 2020-08-12 2020-08-12 Energy-saving system and method for electric steam boiler with condensed water circulation
CN2020108082077 2020-08-12

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CN202110852046.6A Withdrawn CN113432104A (en) 2020-08-12 2021-07-27 Energy-saving system and method for electric steam boiler with condensed water circulation

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CN113896266B (en) * 2021-11-15 2023-05-02 江苏科技大学 Compression injection combined heat pump sewage treatment system and operation method thereof

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