A low pressure steam generator

Abstract

A low-pressure steam generator includes a first-stage system and a second-stage system, characterized in that: it also includes an intermediate heat exchanger and a heat storage device, and the second-stage system includes a steam generating device; the first-stage system, the intermediate heat storage heat exchanger and the second-stage system are connected in sequence. The low-pressure steam generator provided by the present invention is fully electrically driven, green and environmentally friendly, and has high efficiency. The power consumption of generating the same amount of low-pressure steam is less than 45% of that of an electric steam generator.

Description

Technical Field

[0001] The invention relates to a steam generator, and in particular to a low-pressure steam generator. Background Art

[0002] Steam is widely used in life, industry and agriculture. Most existing steam generators have high pressure and high requirements for containers and generators. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a low-pressure steam generator, including a first-stage system, a second-stage system, and an intermediate heat exchange accumulator, and the second-stage system includes a steam generating device; the first-stage system, the intermediate heat exchange accumulator and the second-stage system are connected in sequence.

[0004] Specifically, the intermediate heat exchange accumulator includes a heat exchange chamber, an extended liquid storage chamber, a heat-carrying solvent and a solution pump; the heat exchange chamber is connected to the extended liquid storage chamber through two pipes; the solution pump is installed in one of the pipes; and the heat-carrying solvent is filled in the heat exchange chamber and the extended liquid storage chamber.

[0005] Specifically, the steam generating device includes a condensation chamber, a water vapor chamber, a temperature sensing probe, a steam unloading valve, a copper tube, a pressure switch, a bypass pipe, a flow control valve, a one-way valve, and a pressure regulating valve; the condensation chamber and the water vapor chamber are an integrated sealed metal container, which are separated by a baffle in the middle; a steam inlet and a liquid outlet are provided on the condensation chamber; the copper tube is fixed inside the condensation chamber, the inlet is located on the side wall of the condensation chamber, and the outlet is located on the baffle and communicated with the water vapor chamber; the pressure switch and the steam unloading valve are installed outside the water vapor chamber; the water vapor chamber is provided with a water vapor outlet, the temperature sensing probe is installed on the side of the water vapor outlet, and the pressure regulating valve is installed at the water vapor outlet; the flow control valve is installed on the water inlet of the copper tube; one end of the bypass pipe is communicated with the water vapor chamber, and the other end is communicated with the copper tube; a one-way valve is installed on the bypass pipe.

[0006] Specifically, the water vapor chamber is located above the condensation chamber.

[0007] Specifically, the first-stage system is a low-temperature heat pump system with a jet reheat structure; it includes a low-temperature jet reheat compressor, a fin heat exchanger, a first electronic expansion valve, a second electronic expansion valve, an economizer, a gas-liquid separator, a first filter, a second filter, and a four-way valve; the four-way valve is respectively connected to the air outlet, fin heat exchanger, gas-liquid separator and first filter of the low-temperature jet reheat compressor; the economizer is connected to the first filter, the first electronic expansion valve, the second electronic expansion valve and the enthalpy injection port of the low-temperature jet reheat compressor; the second electronic expansion valve is connected to the fin heat exchanger through the second filter; the gas-liquid separator is connected to the air intake of the low-temperature jet reheat compressor; copper pipe welding is used to connect and seal the components.

[0008] Specifically, the high-temperature steam pipeline connecting the four-way valve and the first filter is located in the intermediate heat exchange accumulator.

[0009] Specifically, the second-stage system is a system of a high-temperature compressor unit; it includes a high-temperature compressor, a third electronic expansion valve, a gas-liquid separator, and a third filter; the air intake of the high-temperature compressor is connected to the gas-liquid separator, and the air exhaust port is connected to the steam inlet of the steam generating device; the liquid outlet of the steam generating device is connected to the gas-liquid separator through the third filter and the third electronic expansion valve in turn; and the components are connected and sealed by copper pipe welding.

[0010] Specifically, the low-temperature steam pipeline connecting the third electronic expansion valve and the gas-liquid separator is located in the intermediate heat exchange accumulator.

[0011] The low-pressure steam generator provided by the present invention has the following beneficial effects:

[0012] (1) The sealed flowing liquid is used in the intermediate heat exchanger accumulator, which has large heat capacity, small temperature fluctuation, high system stability, and is convenient for the control system to quickly enter the high-efficiency operation range, thereby improving the efficiency of the whole machine. At the same time, it ensures smooth transition operation between the two-stage system, and will not stop operation due to frosting and defrosting. The operation time is continuous and the efficiency is high.

[0013] (2) The internal volume of the copper tube is less than 30L and is not a pressure vessel, so its use is not restricted.

[0014] (3) It has a wide range of applications and can operate in environments as low as -30°C.

[0015] (4) Fully electric drive, green and environmentally friendly.

[0016] (5) Integrated into one, the volume of steam can be controlled through the flow control valve to maximize the conversion efficiency.

[0017] (6) A bypass pipe is provided so that the unvaporized high-temperature water can flow back into the copper pipe and enter the circulation again, which saves energy. At the same time, it can also prevent the unvaporized water from accumulating for a long time and finally overflowing, thus ensuring safety and stability.

[0018] (7) A one-way valve is installed on the bypass pipe to effectively prevent water in the copper pipe from flowing into the steam chamber, thereby improving safety.

[0019] (8) The pressure switch and steam unloading valve can ensure that the air pressure in the steam chamber is within a stable range.

[0020] (9) The power consumption of producing the same amount of low-pressure steam is less than 45% of that of an electric steam generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the low-pressure steam generator provided by the present invention.

[0022] Figure 2 It is a structural schematic diagram of a steam generating device of a low-pressure steam generator provided by the present invention.

[0023] Figure 3 It is a structural schematic diagram of the intermediate heat exchange and heat storage device of the low-pressure steam generator provided by the present invention.

[0024] In the figure: 1. First-stage system; 10. High-temperature steam pipeline; 11. Low-temperature jet reheat compressor; 12. Four-way valve; 13. Finned heat exchanger; 14. First filter; 15. Second filter; 16. Economizer; 17. Gas-liquid separator; 18. First electronic expansion valve; 19. Second electronic expansion valve; 2. Second-stage system; 20. Low-temperature steam pipeline; 21. High condensing temperature compressor; 23. Third electronic expansion valve; 24. Third filter; 25. Gas-liquid separator; 3. Intermediate heat exchange accumulator; 31. Heat exchange chamber; 32. Extended liquid storage chamber; 33. Solution pump; 4. Steam generating device; 41. Condensation chamber; 42. Water vapor chamber; 43. Temperature sensor; 44. Pressure switch; 45. Steam unloading load; 46. Copper tube; 47. Baffle; 48. Steam inlet; 49. Liquid outlet; 421. Water vapor outlet; 422. Bypass pipe; 423. One-way valve; 461. Flow control valve; 424. Pressure regulating valve. DETAILED DESCRIPTION Example

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, a low-pressure steam generator provided by the present invention includes a first-stage system 1 and a second-stage system 2, characterized in that it also includes an intermediate heat exchange accumulator 3, and the second-stage system includes a steam generating device 4; the first-stage system 1, the intermediate heat exchange accumulator 3 and the second-stage system 2 are connected in sequence.

[0026] Furthermore, the intermediate heat exchange accumulator 3 includes a heat exchange chamber 31, an extended liquid storage chamber 32, a heat-carrying solvent and a solution pump 33; the heat exchange chamber 31 is connected to the extended liquid storage chamber 32 through two pipes; the solution pump 33 is installed in one of the pipes; and the heat-carrying solvent is filled in the heat exchange chamber 31 and the extended liquid storage chamber 32.

[0027] Furthermore, the steam generating device includes a condensation chamber 41, a water vapor chamber 42, a temperature probe 43, a pressure switch 44, a steam unloading valve 45, a copper tube 46, a bypass pipe 422, a flow control valve 461, a one-way valve 423, and a pressure regulating valve 424; the condensation chamber 41 and the water vapor chamber 42 are an integrated sealed metal container, separated by a baffle 47; the water vapor chamber 42 is located above the condensation chamber 41; the condensation chamber 41 is provided with a steam inlet 48 and a liquid outlet 49; the copper tube 46 is fixed inside the condensation chamber 41, and the inlet is located on the side wall of the condensation chamber 41 On the bottom, the outlet is located on the baffle 47 and is connected to the water vapor chamber 42; the pressure switch 44 and the steam unloading valve 45 are installed on the outside of the water vapor chamber 42; the water vapor chamber 42 is provided with a water vapor outlet 421, the temperature sensor 43 is installed on the side of the water vapor outlet 421, and the pressure regulating valve 424 is installed at the water vapor outlet 42; the flow control valve 461 is installed on the water inlet of the copper tube 46; one end of the bypass pipe 422 is connected to the water vapor chamber 42, and the other end is connected to the copper tube 46; a one-way valve 423 is installed on the bypass pipe 422.

[0028] Furthermore, the first-stage system 1 is a low-temperature heat pump system with a jet reheat structure; it includes a low-temperature jet reheat compressor 11, a finned heat exchanger 13, a first electronic expansion valve 18, a second electronic expansion valve 19, an economizer 16, a gas-liquid separator 17, a first filter 14, a second filter 15, and a four-way valve 12; the four-way valve 12 is respectively connected to the air outlet of the low-temperature jet reheat compressor 11, the finned heat exchanger 13, the gas-liquid separator 17 and the first filter 14; the economizer 16 is connected to the first filter 14, the first electronic expansion valve 18, the second electronic expansion valve 19 and the enthalpy injection port of the low-temperature jet reheat compressor 11; the second electronic expansion valve 19 is connected to the finned heat exchanger 13 through the second filter 15; the gas-liquid separator 17 is connected to the air intake port of the low-temperature jet reheat compressor 11; and the components are connected and sealed by copper pipe welding.

[0029] Furthermore, the high-temperature steam pipeline connecting the four-way valve 12 and the first filter 14 is located in the intermediate heat exchange accumulator 3 .

[0030] Furthermore, the second-stage system 2 is a system of a high-temperature compressor unit; it includes a high-temperature compressor 21, a third electronic expansion valve 23, a gas-liquid separator 25, and a third filter 24; the air intake of the high-temperature compressor 21 is connected to the gas-liquid separator 25, and the air exhaust port is connected to the steam inlet 48 of the steam generating device 4; the liquid outlet 49 of the steam generating device is connected to the gas-liquid separator 25 through the third filter 24 and the third electronic expansion valve 23 in sequence; and the components are connected and sealed by copper pipe welding.

[0031] Furthermore, the low-temperature steam pipeline connecting the third electronic expansion valve 23 and the gas-liquid separator 25 is located in the intermediate heat exchange regenerator 3 .

[0032] When in use, during operation, the low-temperature jet reheating compressor 11 in the first-stage system 1 is driven by electric energy to work, and the low-temperature and low-pressure condensing agent absorbs heat from the air by using the steam compression heating cycle. The condensing agent A is compressed into high-temperature and high-pressure steam by the low-temperature jet reheating compressor 11 and enters the high-temperature steam pipeline 10 in the four-way valve 12 and the first filter 14, and enters the heat exchange chamber 31 of the intermediate heat exchange regenerator 3. The high-temperature and high-pressure condensing agent A steam exchanges heat with the heat-carrying solvent in the intermediate heat exchange regenerator 3, heats the heat-carrying solvent, and the condensing agent A changes from gas to liquid, and then re-enters the first-stage system 1 for heat transfer. There is condensing agent B in the low-temperature steam pipeline 20 on the second-stage system 2. The condensing agent B exchanges heat with the heat-carrying solvent, changes from liquid to gas, and the gaseous condensing agent B steam is absorbed and compressed by the high-temperature compressor 21 to become condensing agent B steam with a higher temperature, and the condensing agent B steam temperature reaches above 150°C. The condensing agent B steam comes out from the exhaust port of the high temperature compressor 21, enters the condensing chamber 41 through the steam inlet 48 of the steam generating device 4, and the copper tube 46 contains normal temperature water. The condensing agent B steam exchanges heat with the normal temperature water in the copper tube 46, and the steam becomes the condensing agent B liquid, which is discharged from the liquid outlet 49 and enters the second-stage system for recirculation. The normal temperature water becomes water vapor, enters the water vapor chamber 42 from the copper tube 46, and is finally discharged from the water vapor outlet 421.

[0033] The normal temperature water in the copper tube 46 may have some unvaporized high temperature water that also enters the water vapor chamber 42. The unvaporized high temperature water is discharged from the bypass pipe 422 and enters the copper tube 46 for re-vaporization. The steam volume can be controlled by adjusting the flow control valve 461 on the copper tube 46, so as to adjust according to different needs and maximize the conversion efficiency. The outlet pressure of the water vapor chamber 42 is adjusted by the pressure regulating valve 424 to ensure safety and meet the needs of different environments.

[0034] The solution pump 33 in the intermediate heat exchange accumulator 3 can drive the heat-carrying solvent to flow between the extended liquid storage chamber 32 and the heat exchange chamber 31, thereby improving the heat exchange efficiency. The extended liquid storage chamber 32 can store more heat-carrying solvent, thereby improving the overall power.

[0035] Table 1 Comparison between the products provided by this technical solution and the electric steam generator

[0036]

[0037] It can be seen from Table 1 that, compared with the electric steam generator, the low-pressure steam generator provided by the present technical solution can generate 419 cubic meters of steam when consuming 100 kWh of electricity, while the electric steam generator can only generate 183 cubic meters of steam, which is 43.7% of the low-pressure steam generator provided by the present solution. It can be seen that the low-pressure steam generator provided by the present solution is more energy-saving and has higher working efficiency.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A low-pressure steam generator, comprising a first-stage system and a second-stage system, characterized in that: It also includes an intermediate heat exchange accumulator, and the second-level system includes a steam generating device; the first-level system, the intermediate heat exchange accumulator and the second-level system are connected in sequence; the intermediate heat exchange accumulator includes a heat exchange chamber, an extended liquid storage chamber, a heat-carrying solvent and a solution pump; the heat exchange chamber is connected to the extended liquid storage chamber through two pipes; the solution pump is installed in one of the pipes; the heat-carrying solvent is filled in the heat exchange chamber and the extended liquid storage chamber; the steam generating device includes a condensing chamber, a water vapor chamber, a temperature sensing probe, a pressure switch, a steam unloading valve, a copper pipe, a bypass pipe, a flow control valve, a one-way valve, and a pressure regulating valve; the condensing chamber and the water vapor chamber are an integrated sealed metal container, and the intermediate pipe The condensing chamber is separated by a baffle; a steam inlet and a liquid outlet are provided on the condensing chamber; the copper tube is fixed inside the condensing chamber, the inlet is located on the side wall of the condensing chamber, the outlet is located on the baffle, and is connected to the water vapor chamber; the pressure switch and the steam unloading valve are installed outside the water vapor chamber; the water vapor chamber is provided with a water vapor outlet, the temperature sensor is installed on the side of the water vapor outlet, and the pressure regulating valve is installed at the water vapor outlet; the flow control valve is installed on the water inlet of the copper tube; one end of the bypass pipe is connected to the water vapor chamber, and the other end is connected to the copper tube; a one-way valve is installed on the bypass pipe; the first-stage system is a low-temperature heat pump system with a jet enthalpy increase structure; It includes a low-temperature jet reheat compressor, a finned heat exchanger, a first electronic expansion valve, a second electronic expansion valve, an economizer, a gas-liquid separator, a first filter, a second filter, and a four-way valve; the four-way valve is respectively connected to the air outlet of the low-temperature jet reheat compressor, the finned heat exchanger, the gas-liquid separator and the first filter; the economizer is connected to the first filter, the first electronic expansion valve, the second electronic expansion valve and the enthalpy injection port of the low-temperature jet reheat compressor; the second electronic expansion valve is connected to the finned heat exchanger through the second filter; the gas-liquid separator is connected to the air intake port of the low-temperature jet reheat compressor; copper pipe welding is used to connect and seal the components.

2. A low-pressure steam generator according to claim 1, characterized in that: The water vapor chamber is located above the condensation chamber.

3. A low-pressure steam generator according to claim 1, characterized in that: A high-temperature steam pipeline connecting the four-way valve and the first filter is located in the intermediate heat exchange accumulator.

4. A low-pressure steam generator according to claim 1, characterized in that: The second-stage system is a system of a high-temperature compressor unit; it includes a high-temperature compressor, a third electronic expansion valve, a gas-liquid separator, and a third filter; the air intake of the high-temperature compressor is connected to the gas-liquid separator, and the air exhaust port is connected to the steam inlet of the steam generating device; the liquid outlet of the steam generating device is connected to the gas-liquid separator through the third filter and the third electronic expansion valve in turn; and the components are connected and sealed by copper pipe welding.

5. A low-pressure steam generator according to claim 4, characterized in that: A low-temperature steam pipeline connecting the third electronic expansion valve and the gas-liquid separator is located in the intermediate heat exchange accumulator.

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