Low-pressure steam and hot water recovery double-effect type heating system
By using a dual-effect heating system that recovers low-pressure steam and hot water, the heat of the circulating water is extracted using an absorption heat pump and heat exchanger, solving the problems of high steam consumption and heat waste, and achieving a reduction in production costs and efficient use of energy.
Patent Information
- Application Number
- CN202423114209.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-17
AI Technical Summary
In existing technologies, tap water (demineralized water) at the required temperature is obtained by using a large amount of steam for heat exchange, which results in high production costs and the heat of the cooling circulating water is not effectively recovered and utilized, causing energy waste.
The system employs a dual-effect heating system that recovers low-pressure steam and hot water. It utilizes an absorption heat pump and heat exchanger to extract heat from the circulating water, heating the heat source water and process return water, reducing steam consumption, and preventing impurities from clogging the system, thus achieving efficient heat recovery and reuse.
Significantly reduce steam consumption, lower production costs, improve corporate economic efficiency, achieve efficient energy use and environmental benefits, and promote sustainable development.
Smart Images
Figure CN223769072U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heating system technology, specifically to a dual-effect heating system for low-pressure steam and hot water recovery. Background Technology
[0002] In modern industrial production, efficient energy utilization and cost control are among the key issues facing enterprises. Many industrial production processes involve the exchange and utilization of heat, and also involve the conversion and consumption of large amounts of energy in different forms.
[0003] The existing production process requires 55°C tap water (demineralized water) to meet production needs. This 55°C water is generated through steam heat exchange. While this traditional steam heat exchange method meets the water temperature requirements, it has significant drawbacks. Steam, as a high-grade energy source, has relatively high production and usage costs. Using large amounts of steam for heat exchange to obtain the required temperature of tap water (demineralized water) greatly increases production costs and reduces the company's economic efficiency. This not only increases the company's economic burden but, from a macro perspective, is also an inefficient use of energy, inconsistent with the current trend of energy conservation and emission reduction.
[0004] Meanwhile, this production process also generates a large amount of cooling circulating water. This water is approximately 37°C and needs to be cooled to a specific temperature range according to the production process requirements. Cooling this circulating water consumes additional cooling resources, and if this heat is not utilized effectively during the cooling process, it will also result in energy waste. Traditional cooling methods simply release this heat into the environment without effectively recovering and reusing it.
[0005] With rising energy prices and increasingly stringent environmental requirements, businesses urgently need to find more energy-efficient and effective solutions to address heat utilization and cost issues in the production process. Utility Model Content
[0006] The purpose of this invention is to provide a dual-effect heating system for low-pressure steam and hot water recovery, which solves the problem in the existing technology that uses a large amount of steam for heat exchange to obtain the required water temperature of tap water (demineralized water), which greatly increases production costs and reduces the economic benefits of enterprises.
[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0008] A low-pressure steam and hot water recovery dual-effect heating system includes an absorption heat pump, a first heat exchanger, a process return water pipe, a process supply water pipe, a circulating water inlet pipe, and a circulating water outlet pipe. The circulating water inlet pipe and the circulating water outlet pipe are respectively connected to the inlet and outlet of the first flow channel of the first heat exchanger. The inlet and outlet of the second flow channel of the first heat exchanger are respectively connected to the evaporator of the absorption heat pump through the heat source inlet pipe and the heat source outlet pipe. The process return water pipe and the process supply water pipe are respectively connected to the inlet and outlet of the condenser of the absorption heat pump. The generator of the absorption heat pump is connected to a steam pipeline.
[0009] A further technical solution is to install a circulating water pump on the heat source inlet pipe.
[0010] A further technical solution includes a second heat exchanger, with the process return water pipe connected to the second flow channel of the second heat exchanger, and the inlet and outlet of the first flow channel of the second heat exchanger connected to the circulating water inlet pipe and the circulating water outlet pipe, respectively.
[0011] A further technical solution is that a filter is installed on the circulating water inlet pipe. The circulating water inlet pipe includes a first water pipe and a second water pipe. The first water pipe is connected to the inlet of the filter, and the outlet of the filter is connected to one end of the second water pipe. The inlet of the first flow channel of the first heat exchanger and the inlet of the first flow channel of the second heat exchanger are both connected to the other end of the second water pipe.
[0012] A further technical solution is that the filter includes a housing and a first filter tube installed inside the housing. The two ends of the first filter tube are connected to a first water pipe and a second water pipe, respectively. A first filter screen is installed inside the first filter tube.
[0013] A further technical solution involves installing a second filter tube inside the outer casing. The two ends of the second filter tube are connected to the first water pipe and the second water pipe, respectively. A second filter screen is installed inside the second filter tube. A first drain pipe is connected between the first filter screen and the first water pipe, and a first valve is installed on the first drain pipe. A second valve is installed between the first drain pipe and the first water pipe. A second drain pipe is connected between the second filter screen and the first water pipe, and a third valve is installed on the second drain pipe. A fourth valve is installed between the second drain pipe and the first water pipe.
[0014] A further technical solution is that a fifth valve is installed between the first filter pipe and the second water pipe; and a sixth valve is installed between the second filter pipe and the second water pipe.
[0015] Compared with existing technologies, the beneficial effects of this utility model are as follows: 1. By extracting heat from the circulating water through a heat exchanger, the heat source water in the heat source inlet pipe is used to heat the working fluid of the absorption heat pump. The heated heat source water is then used as the heat source for the evaporator of the absorption heat pump. Combined with the steam in the generator to heat the working fluid, it can effectively heat the return water in the process return water pipe, thus significantly reducing steam consumption. 2. The circulating water after temperature reduction can be reused, saving the cost of cooling water replenishment, further reducing production costs, improving the overall competitiveness of enterprises, and bringing significant economic and environmental benefits to enterprises. This is of great significance for promoting the sustainable development of the industrial sector. 3. The steam in the steam pipeline can also partially or completely utilize the waste steam generated in the process as energy to enter the absorption heat pump, thus making good use of the waste steam. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a low-pressure steam and hot water recovery dual-effect heating system according to the present invention. Figure 1 .
[0017] Figure 2 This is a schematic diagram of a low-pressure steam and hot water recovery dual-effect heating system according to the present invention. Figure 2 .
[0018] Figure 3 This is a schematic diagram of a filter in a dual-effect heating system for low-pressure steam and hot water recovery according to the present invention.
[0019] Icons: 1-Absorption heat pump, 2-First heat exchanger, 3-Process return water pipe, 4-Process supply water pipe, 5-Circulating water inlet pipe, 6-Circulating water outlet pipe, 7-Heat source water inlet pipe, 8-Heat source water outlet pipe, 9-Steam pipe, 10-Circulating water pump, 11-Second heat exchanger, 12-Filter, 13-Second water pipe, 14-First water pipe, 15-Outer shell, 16-First filter pipe, 17-First filter screen, 18-Second filter pipe, 19-Second filter screen, 20-First drain pipe, 21-First valve, 22-Second valve, 23-Second drain pipe, 24-Third valve, 25-Fourth valve, 26-Fifth valve, 27-Sixth valve. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be 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 present utility model and are not intended to limit the present utility model.
[0021] Figures 1 to 3 The following is an embodiment of the utility model.
[0022] Example 1:
[0023] like Figure 1 As shown, a low-pressure steam and hot water recovery dual-effect heating system includes an absorption heat pump 1, a first heat exchanger 2, a process return water pipe 3, a process supply water pipe 4, a circulating water inlet pipe 5, and a circulating water outlet pipe 6. The circulating water inlet pipe 5 and the circulating water outlet pipe 6 are respectively connected to the inlet and outlet of the first flow channel of the first heat exchanger 2. The inlet and outlet of the second flow channel of the first heat exchanger 2 are respectively connected to the evaporator of the absorption heat pump 1 through the heat source inlet pipe 7 and the heat source outlet pipe 8. The process return water pipe 3 and the process supply water pipe 4 are respectively connected to the inlet and outlet of the condenser of the absorption heat pump 1. The generator of the absorption heat pump 1 is connected to a steam pipe 9. Heat is extracted from the circulating water via a heat exchanger to heat the heat source water in the heat source inlet pipe 7. This heated water then serves as the heat source for the evaporator of the absorption heat pump 1, heating the working fluid. Combined with steam from the generator, this effectively heats the return water in the process return water pipe 3, significantly reducing steam consumption. The cooled circulating water can then be reused, saving on cooling water replenishment costs, further reducing production costs, and enhancing the company's overall competitiveness. This brings significant economic and environmental benefits and is of great importance to promoting sustainable development in the industrial sector.
[0024] A circulating water pump 10 is installed on the heat source inlet pipe 7. By setting up the circulating water pump 10, the heat source water in the circulating inlet pipe 5 and the circulating outlet pipe 6 can easily enter the first heat exchanger 2 for circulating heating and circulate to release heat in the evaporator.
[0025] It also includes a second heat exchanger 11. The process return water pipe 3 is connected to the second flow channel of the second heat exchanger 11. The inlet and outlet of the first flow channel of the second heat exchanger 11 are connected to the circulating water inlet pipe 5 and the circulating water outlet pipe 6, respectively. By setting up the second heat exchanger 11, the return water in the process return water pipe 3 can be preheated with the help of circulating water, so that it can be quickly heated to the required temperature when it enters the generator.
[0026] Example 2:
[0027] Based on Example 1, such as Figure 2 , 3As shown, a filter 12 is installed on the circulating water inlet pipe 5. The circulating water inlet pipe 5 includes a first water pipe 14 and a second water pipe 13. The first water pipe 14 is connected to the inlet of the filter 12, and the outlet of the filter 12 is connected to one end of the second water pipe 13. The inlets of the first flow channel of the first heat exchanger 2 and the first flow channel of the second heat exchanger 11 are both connected to the other end of the second water pipe 13. By installing the filter 12, the circulating water entering the first heat exchanger 2 and the second heat exchanger 11 can be filtered, preventing impurities from entering the first heat exchanger 2 and the second heat exchanger 11 and causing flow channel blockage.
[0028] The filter 12 includes a housing 15 and a first filter tube 16 installed inside the housing 15. The two ends of the first filter tube 16 are connected to a first water pipe 14 and a second water pipe 13, respectively. A first filter screen 17 is provided inside the first filter tube 16. By setting the first filter tube 16 and the first filter screen 17, impurities can be blocked in the first filter tube 16 by the first filter screen 17. When a certain amount is accumulated, the first filter tube 16 can be cleaned.
[0029] A second filter tube 18 is also installed inside the outer casing 15. The two ends of the second filter tube 18 are connected to the first water pipe 14 and the second water pipe 13, respectively. A second filter screen 19 is installed inside the second filter tube 18. A first drain pipe 20 is connected between the first filter screen 17 and the first water pipe 14 via a first filter tube 16. A first valve 21 is installed on the first drain pipe 20. A second valve 22 is installed between the first drain pipe 20 and the first water pipe 14 via the first filter tube 16. A second drain pipe 23 is connected between the second filter screen 19 and the first water pipe 14 via the second filter tube 18. A third valve 24 is installed on the second drain pipe 23. A fourth valve 25 is installed between the second drain pipe 23 and the first water pipe 14 via the second filter tube 18. This configuration allows for cleaning of either the first filter screen 17 or the second filter screen 19 without interrupting water supply. Specifically, when the filter 12 is in normal use, the first valve 21 and the fourth valve 25 are closed, while one of the second valve 22 and the third valve 24 is simultaneously opened or closed. When the first filter screen 17 needs cleaning, close the second valve 22 and then open the first valve 21. This will cause some of the high-temperature water in the second water pipe 13 to flow back towards the first filter pipe 16, thus backwashing the first filter screen 17. This will remove impurities adsorbed on the first filter screen 17, as well as impurities accumulated between the first filter screen 17 and the second valve 22, through the first drain pipe 20. After cleaning, close the first valve 21 and open the second valve 22. Similarly, when the second filter screen 19 needs cleaning, close the fourth valve 25 and open the third valve 24.
[0030] A fifth valve 26 is installed in the first filter pipe 16 between the first filter screen 17 and the second water pipe 13; a sixth valve 27 is installed in the second filter pipe 18 between the second filter screen 19 and the second water pipe 13. By installing the fifth valve 26, in conjunction with the second valve 22, the flow of high-temperature water on both sides of the first filter screen 17 can be blocked, allowing for the repair or replacement of the first filter screen 17. Similarly, the sixth valve 27, in conjunction with the fourth valve 25, can block the flow of high-temperature water on both sides of the second filter screen 19, allowing for the repair or replacement of the second filter screen 19.
[0031] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.
Claims
1. A low-pressure steam and hot water recovery double-effect heating system, characterized by, The absorption heat pump (1), the first heat exchanger (2), the process return water pipe (3), the process water supply pipe (4), the circulating water inlet pipe (5) and the circulating water outlet pipe (6), the circulating water inlet pipe (5) and the circulating water outlet pipe (6) are connected to the water inlet and water outlet of the first flow channel of the first heat exchanger (2) respectively, the water inlet and water outlet of the second flow channel of the first heat exchanger (2) are communicated with the evaporator of the absorption heat pump (1) through the heat source water inlet pipe (7) and the heat source water outlet pipe (8), the process return water pipe (3) and the process water supply pipe (4) are communicated with the condenser water inlet and water outlet of the absorption heat pump (1) respectively, the generator of the absorption heat pump (1) is connected with the steam pipeline (9); the second heat exchanger (11) is further included, the process return water pipe (3) is connected to the second flow channel of the second heat exchanger (11), the water inlet and water outlet of the first flow channel of the second heat exchanger (11) are communicated with the circulating water inlet pipe (5) and the circulating water outlet pipe (6) respectively; the filter (12) is arranged on the circulating water inlet pipe (5), the circulating water inlet pipe (5) includes the first water pipe (14) and the second water pipe (13), the first water pipe (14) is communicated with the water inlet of the filter (12), the water outlet of the filter (12) is communicated with one end of the second water pipe (13), the water inlet of the first flow channel of the first heat exchanger (2) and the water inlet of the first flow channel of the second heat exchanger (11) are communicated with the other end of the second water pipe (13); the filter (12) includes the shell (15) and the first filter pipe (16) installed in the shell (15), the two ends of the first filter pipe (16) are communicated with the first water pipe (14) and the second water pipe (13) respectively, the first filter pipe (16) is provided with the first filter screen (17); the second filter pipe (18) is further installed in the shell (15), the two ends of the second filter pipe (18) are communicated with the first water pipe (14) and the second water pipe (13) respectively, the second filter pipe (18) is provided with the second filter screen (19), the first filter pipe (16) is connected with the first blowdown pipe (20) between the first filter screen (17) and the first water pipe (14), the first valve (21) is arranged on the first blowdown pipe (20), the second valve (22) is arranged between the first blowdown pipe (20) and the first water pipe (14) of the first filter pipe (16); the second blowdown pipe (23) is connected between the second filter screen (19) and the first water pipe (14) of the second filter pipe (18), the third valve (24) is arranged on the second blowdown pipe (23), the fourth valve (25) is arranged between the second blowdown pipe (23) and the first water pipe (14) of the second filter pipe (18).
2. A low pressure steam and hot water recovery double effect heating system according to claim 1, characterized in that: The circulating water pump (10) is installed on the heat source water inlet pipe (7).
3. A low pressure steam and hot water recovery double effect heating system as set forth in claim 1, wherein: The first filter pipe (16) is provided with a fifth valve (26) between a first filter screen (17) and the second water pipe (13); the second filter pipe (18) is provided with a sixth valve (27) between a second filter screen (19) and the second water pipe (13).