Heat pump type steam generation system for production

Abstract

The utility model discloses a heat pump type steam generation system for production, and relates to the technical field of steam generation systems. In order to solve the problems that an existing steam generating device is low in thermoelectric conversion efficiency and high in energy consumption, a large amount of furnace slag and coke slag can be generated, and pollutants such as nitric oxide and sulfide can be discharged, the following technical scheme is provided: the steam generating device comprises a working medium evaporator, a working medium compressor, a water side heat exchanger, a flash evaporator and a steam compressor, the working medium evaporator is connected with the working medium compressor which is connected with the water-side heat exchanger, an outlet of the water-side heat exchanger is connected with the working medium evaporator and the flash evaporator, an outlet of the flash evaporator is connected with an inlet of the steam compressor, and an outlet of the steam compressor is connected with a user pipeline. Compared with a traditional electric boiler for steam production, the heat pump type steam generation system has the advantages that heat energy is utilized in a gradient mode, steam is produced, electricity-heat conversion efficiency is improved, energy is saved, and the heat pump type steam generation system has good energy-saving and environment-friendly effects.

Description

Technical Field

[0001] The utility model relates to the technical field of steam generation systems, in particular to a heat pump type steam generation system for production. Background Art

[0002] Steam is often needed in the production process of enterprises, but due to local environmental protection requirements, coal-fired boilers cannot be configured, and there is no natural gas source. Therefore, most of these enterprises use electrode boilers to generate steam for production. However, as a representative of electric heating steam boilers, electrode boilers have low thermoelectric conversion efficiency and are high-energy consumption equipment. On the other hand, traditional boilers, represented by coal-fired boilers, will produce a large amount of slag and coke residue, and emit pollutants such as nitrogen oxides and sulfides, which seriously affect the cleanliness of the boiler and bring pressure to environmental protection. Utility Model Content

[0003] The utility model aims to provide a heat pump steam generating system for production, so as to solve the problems of low thermoelectric conversion efficiency, high energy consumption, large amount of slag and coke residue generated by existing steam generating devices, and emission of pollutants such as nitrogen oxides and sulfides.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A heat pump steam generating system for production comprises a working fluid evaporator, a working fluid compressor, a water-side heat exchanger, a flash evaporator and a steam compressor, wherein the outlet of the working fluid evaporator is connected to the inlet of the working fluid compressor, the outlet of the working fluid compressor is connected to the inlet of the water-side heat exchanger, the outlet of the water-side heat exchanger is respectively connected to the inlet of the working fluid evaporator and the inlet of the flash evaporator, the outlet of the flash evaporator is connected to the inlet of the steam compressor, and the outlet of the steam compressor is connected to a user pipeline.

[0006] Beneficial effects: The utility model connects the working fluid evaporator, working fluid compressor, water-side heat exchanger, flash evaporator and steam compression devices, effectively utilizes the organic working fluid to absorb heat energy in the air to produce hot water, adopts flash evaporation technology to produce low-quality steam from hot water, and then uses steam compression technology to upgrade the low-quality steam to high-quality steam, thereby improving the electric heat conversion efficiency and saving energy.

[0007] Furthermore, an air supply device is provided at the inlet of the working fluid evaporator, and the outlet of the air supply device is connected to the inlet of the working fluid evaporator. The air supply device is used to supply hot air into the working fluid evaporator.

[0008] Furthermore, an expansion valve is provided between the working fluid evaporator and the water side heat exchanger, the outlet of the water side heat exchanger is connected to the inlet of the expansion valve, and the outlet of the expansion valve is connected to the inlet of the working fluid evaporator. The expansion valve reduces the pressure of the high-pressure liquid organic working fluid to a low-pressure liquid.

[0009] Furthermore, a feed water tank is arranged between the flash evaporator and the water-side heat exchanger, the outlet of the flash evaporator is connected to the inlet of the feed water tank, and the outlet of the feed water tank is connected to the inlet of the water-side heat exchanger.

[0010] Furthermore, a water pump is provided between the water supply tank and the water-side heat exchanger, the outlet of the water supply tank is connected to the inlet of the water pump, and the outlet of the water pump is connected to the inlet of the water-side heat exchanger.

[0011] The utility model has the following beneficial effects:

[0012] The heat pump steam generating system of the utility model adopts heat pump technology, utilizes organic working medium to absorb heat energy in the air to produce hot water; and adopts flash evaporation technology to utilize hot water to produce low-quality steam; and then uses steam compression technology to upgrade the low-quality steam to high-quality steam.

[0013] Compared with traditional electric boilers producing steam, the heat pump steam generating system of the utility model utilizes heat energy in a step-by-step manner to produce steam, thereby improving the electric-heat conversion efficiency, saving energy, and having good energy-saving and environmental protection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flow chart of a heat pump steam generating system used in production in the utility model;

[0015] Figure 1 The reference numerals shown in the figure represent respectively: 1-working fluid evaporator; 2-working fluid compressor; 3-water side heat exchanger; 4-expansion valve; 5-air supply device; 6-flash evaporator; 7-water feed tank; 8-water pump; 9-steam compressor. DETAILED DESCRIPTION

[0016] The following is a clear and complete description of the technical solution of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0017] Please refer to Figure 1The utility model adopts heat pump technology, and uses organic working fluid to absorb heat energy in the air and exchange heat with water to produce hot water. The organic working fluid adopts the organic working fluid of model R152a, and the state of the organic working fluid changes from low-pressure liquid state → low-pressure gas state → high-pressure gas state → low-pressure gas state → low-pressure liquid state to complete a complete cycle.

[0018] The utility model provides a heat pump type steam generation system for production, which includes a working medium evaporator 1, a working medium compressor 2, a water side heat exchanger 3, a flash evaporator 6 and a steam compressor 9. The outlet of the working medium evaporator 1 is connected to the inlet of the working medium compressor 2, the outlet of the working medium compressor 2 is connected to the inlet of the water side heat exchanger 3, the outlet of the water side heat exchanger 3 is respectively connected to the inlet of the working medium evaporator 1 and the inlet of the flash evaporator 6, the outlet of the flash evaporator 6 is connected to the inlet of the steam compressor 9, and the outlet of the steam compressor 9 is connected to the user pipeline. The working medium evaporator 1 can convert the low-pressure liquid organic working medium into a low-pressure gaseous organic working medium under the action of hot air, the working medium compressor 2 can pressurize the low-pressure gaseous organic working medium into a high-pressure gaseous organic working medium, the water side heat exchanger 3 exchanges heat between the high-pressure gaseous organic working medium and water, and the organic working medium after heat exchange becomes a high-pressure liquid state, and the water absorbs the heat energy of the organic working medium through the water side heat exchanger 3 to generate hot water.

[0019] The inlet of the working medium evaporator 1 is also provided with an air supply device 5, which can be a fan, and the outlet of the air supply device 5 is connected to the inlet of the working medium evaporator 1, and the air supply device 5 is used to send hot air into the working medium evaporator 1. The air supply device 5 sends hot air into the organic working medium evaporator 1.

[0020] An expansion valve 4 is provided between the working medium evaporator 1 and the water side heat exchanger 3. The outlet of the water side heat exchanger 3 is connected to the inlet of the expansion valve 4. The outlet of the expansion valve 4 is connected to the inlet of the working medium evaporator 1. The expansion valve 4 reduces the pressure of the high-pressure liquid organic working medium into a low-pressure liquid state.

[0021] A water supply tank 7 and a water pump 8 are provided between the flash evaporator 6 and the water side heat exchanger 3. The outlet of the flash evaporator 6 is connected to the inlet of the water supply tank 7, the outlet of the water supply tank 7 is connected to the inlet of the water pump 8, the outlet of the water pump 8 is connected to the inlet of the water side heat exchanger 3, and the water pump 8 pressurizes the cold water coming out of the water supply tank 7 and enters the water side heat exchanger 3, and generates hot water by absorbing the thermal energy of the high-pressure gaseous organic working fluid.

[0022] The utility model has a highly efficient energy-saving and emission-reducing effect. Taking a paper mill as an example, the production process of the mill requires 20t / h-1.6MPa saturated steam. If an electric heating steam boiler is used, a new 20MW electrode steam boiler needs to be built, and the actual power consumption per hour is 15516kW; if the heat pump steam generation system of this embodiment is used, the actual power consumption per hour is 9335.89kW. The heat pump steam generation system can save 6180.11kW of electricity per hour, which saves 39.83% of electricity compared with the traditional electric heating steam generation process. According to the calculation of 8000h of annual operation of the equipment, the heat pump steam generation system can save 4.944×107kW of electricity per year, saving 24.72 million yuan in electricity bills.

[0023] The working principle of the utility model is:

[0024] 1. The air supply device 5 sends hot air into the working medium evaporator 1, and the organic working medium is converted from a low-pressure liquid to a low-pressure gaseous state. The low-pressure gaseous organic working medium is pressurized by the working medium compressor 2 and becomes a high-pressure gaseous organic working medium. The high-pressure gaseous organic working medium enters the water-side heat exchanger 3 to exchange heat with water. After the heat exchange, the organic working medium becomes a high-pressure liquid state, and is reduced in pressure by the expansion valve 4 and becomes a low-pressure liquid state. After the water absorbs the heat energy of the organic working medium through the water-side heat exchanger 3, hot water is generated.

[0025] 2. The cold water coming out of the water supply tank 7 is pressurized by the water supply pump 8 and enters the water side heat exchanger 3 to generate hot water by absorbing the heat energy of the high-pressure gaseous organic working fluid; after the hot water enters the flash evaporator 6, the pressure of part of the water is reduced and it is converted into low-quality steam through secondary evaporation, and the other part of the water enters the water supply tank 7 for recycling, and a small amount of make-up water is provided by the outside to enter the water supply tank 7.

[0026] 3. The low-quality steam from the flash evaporator 6 is pressurized by the steam compressor 9 to produce high-quality steam for users.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat pump steam generation system for production, characterized in that: include: A working fluid evaporator (1), a working fluid compressor (2), a water-side heat exchanger (3), a flash evaporator (6), and a steam compressor (9), wherein the outlet of the working fluid evaporator (1) is connected to the inlet of the working fluid compressor (2), the outlet of the working fluid compressor (2) is connected to the inlet of the water-side heat exchanger (3), the outlet of the water-side heat exchanger (3) is respectively connected to the inlet of the working fluid evaporator (1) and the inlet of the flash evaporator (6), the outlet of the flash evaporator (6) is connected to the inlet of the steam compressor (9), and the outlet of the steam compressor (9) is connected to a user pipeline.

2. The heat pump steam generation system for production according to claim 1, characterized in that: The inlet of the working medium evaporator (1) is also provided with an air supply device (5), the outlet of the air supply device (5) is connected to the inlet of the working medium evaporator (1), and the air supply device (5) is used to supply hot air into the working medium evaporator (1).

3. The heat pump steam generation system for production according to claim 1, characterized in that: An expansion valve (4) is provided between the working medium evaporator (1) and the water side heat exchanger (3); the outlet of the water side heat exchanger (3) is connected to the inlet of the expansion valve (4); the outlet of the expansion valve (4) is connected to the inlet of the working medium evaporator (1); and the expansion valve (4) reduces the pressure of the high-pressure liquid organic working medium into a low-pressure liquid state.

4. The heat pump steam generation system for production according to any one of claims 1 to 3, characterized in that: A water supply tank (7) is provided between the flash evaporator (6) and the water-side heat exchanger (3); the outlet of the flash evaporator (6) is connected to the inlet of the water supply tank (7); and the outlet of the water supply tank (7) is connected to the inlet of the water-side heat exchanger (3).

5. The heat pump steam generation system for production according to claim 4, characterized in that: A water pump (8) is provided between the water supply tank (7) and the water-side heat exchanger (3); the outlet of the water supply tank (7) is connected to the inlet of the water pump (8); and the outlet of the water pump (8) is connected to the inlet of the water-side heat exchanger (3).

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