Raw water heating equipment

Abstract

The invention relates to raw water heating equipment which is used for reducing energy consumption. The equipment comprises a raw water tank connected with a first heat exchanger and used for providing raw water; the heat recovery cooling-water machine module is respectively connected with the first heat exchanger and the medium-temperature chilled water tail end module and is used for carrying out heat recovery on the first warm water in the heat recovery cooling-water machine module and outputting the first warm water after heat recovery; second warm water in the heat recovery cooling-water machine module is heated through heat obtained through heat recovery, and the heated second warm water is output; the medium-temperature chilled water tail end module is connected with the first heat exchanger and used for conducting cold recovery on the first warm water after heat recovery and outputting the first warm water after cold recovery; the first heat exchanger is used for heating the raw water by utilizing the heat of the first warm water after cold recovery and outputting the preheated raw water; and the second heat exchanger is respectively connected with the first heat exchanger and the heat recovery cooling-water machine module, and is used for carrying out secondary heating on the preheated raw water by utilizing the heated second warm water and outputting the heated raw water.

Description

Technical Field

[0001] The present application relates to the field of energy conservation, and in particular to a raw water heating device. Background Art

[0002] With economic development, social progress, and the approaching deadlines for carbon peak and carbon neutrality, energy conservation and recycling have become inevitable and a social consensus. In large-scale semiconductor or display panel factories, there are multiple operating conditions where both cooling and heating are supplied simultaneously. By organizing these operating conditions and optimizing the exchange of cooling and heating energy flows, significant energy efficiency gains can be achieved.

[0003] Panel and semiconductor factories are almost always equipped with large-scale pure water preparation systems. The water supply temperature is typically between 23 and 25°C, depending on process requirements. However, in the vast areas north of the Yangtze River, the raw water (or municipal water) temperature drops below 12°C for 90 to 120 days of the winter. Typically, a low-temperature hot water system is required to supply hot water (36 to 38°C) to heat the raw water to the required process temperature (23 to 25°C).

[0004] In the prior art, in semiconductor or panel factories, the heat source of the low-temperature hot water system comes from the heat recovery of the chiller, that is, the waste heat recovery generated by the chiller. Figure 1 As shown, the energy (cold and heat) of this raw water heating system is transferred through a heat recovery chiller. Specifically, the heat recovery chiller recovers heat from the chilled water returning to the heat recovery chiller. This heat-recovered chilled water is then transferred to the medium-temperature chilled water terminal. The medium-temperature chilled water terminal then recovers cold from the heat-recovered medium-temperature chilled water. This cold-recovered medium-temperature chilled water is then transferred to the heat recovery chiller. The heat recovered in the heat recovery chiller heats the recovered medium-temperature chilled water, producing heated medium-temperature chilled water. When the raw water reaches the heat exchanger through a water pump, it is heated by the heated medium-temperature chilled water. After heating, the medium-temperature cold water is returned to the heat recovery chiller for circulation. While this method can heat the raw water, it consumes a lot of energy. Summary of the Invention

[0005] The present invention provides a raw water heating device, which is used to save energy consumption under the premise of heating raw water.

[0006] In a first aspect, the present application provides a raw water heating device, comprising a raw water tank, a first heat exchanger, a second heat exchanger, a heat recovery chiller module, and a medium-temperature chilled water terminal module; wherein:

[0007] The raw water tank is connected to the first heat exchanger and is used to provide raw water;

[0008] The heat recovery chiller module is connected to the first heat exchanger and the medium-temperature chilled water terminal module, respectively, and is used to recover heat from the first warm water in the heat recovery chiller module and output the first warm water after heat recovery; and to heat the second warm water in the heat recovery chiller module using the heat obtained by the heat recovery and output the heated second warm water; wherein the water temperature of the first warm water is lower than the water temperature of the second warm water, and the water temperature of the first warm water after heat recovery is lower than the water temperature of the first warm water;

[0009] The medium-temperature chilled water terminal module is connected to the first heat exchanger and is used to perform cold recovery on the first warm water after heat recovery and output the first warm water after cold recovery, wherein the temperature of the first warm water after heat recovery is lower than the temperature of the first warm water after cold recovery, and the temperature of the first warm water after cold recovery is lower than the temperature of the second warm water;

[0010] The first heat exchanger is used to heat the raw water using the heat of the first warm water after the cold recovery, and output the preheated raw water;

[0011] The second heat exchanger is connected to the first heat exchanger and the heat recovery chiller module respectively, and is used to use the heated second warm water to secondary heat the preheated raw water and output the heated raw water.

[0012] In this embodiment, a preheating heat exchanger is added to preheat the raw water using the waste heat from the return water of the intermediate-temperature chilled water (i.e., the first warm water). This preheating heat exchanger also recovers the natural cold source in the raw water, thereby reducing the energy consumption of this energy transfer link in the heat recovery chiller module, improving the overall energy efficiency of the cold and hot water system and reducing energy consumption. The second heat exchanger then heats the raw water, ensuring that the heated water meets the required temperature.

[0013] In a possible embodiment, the first heat exchanger is further used for:

[0014] The raw water is heated by utilizing the heat of the first warm water after cold recovery to obtain the first warm water, and the first warm water is output to the heat recovery chiller module.

[0015] In the embodiment of the present application, the first heat exchanger recovers the natural cold source in the raw water while preheating the raw water, thereby reducing the energy consumption of the heat recovery chiller module.

[0016] In a possible embodiment, the second heat exchanger is further used to:

[0017] The preheated raw water is heated twice using the heated second warm water to obtain the second warm water, and the second warm water is output to the heat recovery chiller module.

[0018] In the embodiment of the present application, the second heat exchanger is used to reheat the raw water while recovering the natural cold source of the raw water, further reducing the energy consumption of the heat recovery chiller module.

[0019] In a possible implementation, the device further includes:

[0020] The first water pump is connected to the raw water tank and the first heat exchanger respectively, and is used to transport the raw water provided by the raw water tank to the first heat exchanger.

[0021] In the embodiment of the present application, the raw water pool is ensured to be transported to the first heat exchanger, which ensures that the raw water is heated smoothly and improves the efficiency of the raw water heating.

[0022] In a possible implementation, the device further includes:

[0023] The second water pump is connected to the second heat exchanger and the heat recovery chiller module respectively, and is used to transport the heated second warm water output by the heat recovery chiller module to the second heat exchanger.

[0024] The embodiments of the present application ensure that raw water heating proceeds smoothly and improves the efficiency of raw water heating.

[0025] In a possible implementation, the device further includes:

[0026] The third water pump is connected to the heat recovery chiller module and the medium-temperature chilled water terminal module respectively, and is used to transport the first warm water after heat recovery output by the heat recovery chiller module to the medium-temperature chilled water terminal module.

[0027] The embodiments of the present application ensure that raw water heating proceeds smoothly and improves the efficiency of raw water heating.

[0028] In a possible implementation, the device further includes:

[0029] The fourth water pump is connected to the medium-temperature chilled water terminal module and the first heat exchanger respectively, and is used to transport the first warm water after cold recovery output by the medium-temperature chilled water terminal module to the first heat exchanger.

[0030] The embodiments of the present application ensure that raw water heating proceeds smoothly and improves the efficiency of raw water heating.

[0031] In a possible implementation manner, the medium-temperature chilled water terminal module is further used to:

[0032] The first warm water after the cold recovery is delivered to the heat recovery chiller module.

[0033] In the embodiment of the present application, the first warm water after cold recovery is transported to the heat recovery chiller module to ensure that the first warm water can be circulated, thereby ensuring the efficiency of raw water heating.

[0034] In one possible implementation, the heat recovery chiller module is further used to:

[0035] The first warm water after cold recovery is subjected to heat recovery to obtain the first warm water after heat recovery.

[0036] In a possible embodiment, the second heat exchanger is further used to:

[0037] The heated raw water is transported to a pure water preparation device so that the pure water preparation device can use the heated raw water to prepare pure water. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 A schematic structural diagram of a raw water heating device in the prior art provided in an embodiment of the present application;

[0040] Figure 2 This is one of the structural schematic diagrams of a raw water heating device provided in an embodiment of the present application;

[0041] Figure 3 This is the second structural schematic diagram of a raw water heating device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of this application more clear, the application will be further described in detail below with reference to the accompanying drawings. The specific operation methods in the method embodiments can also be applied to the device embodiments or system embodiments.

[0043] In the description of this application, "multiple" is understood to mean "at least two." "And / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B are connected, which can mean: A and B are directly connected, and A and B are connected through C. In addition, in the description of this application, words such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be understood as indicating or implying relative importance or order.

[0044] In the prior art, in semiconductor or panel factories, the heat source of the low-temperature hot water system comes from the heat recovery of the chiller, that is, the waste heat recovery generated by the chiller. Figure 1 As shown, the energy (cold and heat) of this raw water heating system is transferred through a heat recovery chiller. Specifically, the heat recovery chiller recovers heat from the chilled water returning to the heat recovery chiller. This heat-recovered chilled water is then transferred to the medium-temperature chilled water terminal. The medium-temperature chilled water terminal then recovers cold from the heat-recovered medium-temperature chilled water. This cold-recovered medium-temperature chilled water is then transferred to the heat recovery chiller. The heat recovered in the heat recovery chiller heats the recovered medium-temperature chilled water, producing heated medium-temperature chilled water. When the raw water reaches the heat exchanger through a water pump, it is heated by the heated medium-temperature chilled water. After heating, the medium-temperature cold water is returned to the heat recovery chiller for circulation. While this method can heat the raw water, it consumes a lot of energy.

[0045] Therefore, this application proposes a raw water heating device that uses the waste heat from the return water of the medium-temperature chilled water (i.e., the first warm water) to preheat the raw water by adding a preheating heat exchanger. At the same time, it recovers the natural cold source in the raw water, thereby reducing the energy consumption of this energy transfer link in the heat recovery chiller module. The raw water is then heated through a second heat exchanger to ensure that the water temperature after heating meets the requirements. This improves the overall energy efficiency of the cold and hot water systems and reduces energy consumption.

[0046] Below, the raw water heating equipment in the embodiments of the present application is introduced in detail with reference to the accompanying drawings.

[0047] like Figure 2 The figure shows the structure of the raw water heating device in the embodiment of the present application. The raw water heating device 200 includes a raw water tank 201, a first heat exchanger 202, a second heat exchanger 203, a heat recovery chiller module 204 and a medium temperature chilled water terminal module 205.

[0048] A raw water tank 201 is connected to the first heat exchanger 202 and is used to provide raw water;

[0049] Figure 2 The temperature of the raw water shown in FIG is 12° C., but this does not limit the temperature of the raw water in the embodiments of the present application.

[0050] In order to improve the efficiency of raw water heating, the raw water heating equipment in the embodiment of the present application also includes a first water pump 206, which is respectively connected to the raw water tank 201 and the first heat exchanger 202, and is used to transport the raw water provided by the raw water tank 201 to the first heat exchanger 202.

[0051] The heat recovery chiller module 204 is connected to the first heat exchanger 202 and the medium-temperature chilled water terminal module 205, respectively, and is used to recover heat from the first warm water in the heat recovery chiller module 204 and output the first warm water after heat recovery. It is also used to heat the second warm water in the heat recovery chiller module 204 using the heat recovered, and output the heated second warm water; wherein the temperature of the first warm water is lower than the temperature of the second warm water, and the temperature of the first warm water after heat recovery is lower than the temperature of the first warm water;

[0052] The water temperature of the first warm water in the embodiment of the present application is 14°C, the water temperature of the first warm water after heat recovery is 12°C, the second warm water in the embodiment of the present application is 28°C, and the water temperature of the second warm water after heating in the embodiment of the present application is 36°C.

[0053] It should be noted that the water temperature of the first warm water, the water temperature of the first warm water after heat recovery, the water temperature of the second warm water, and the water temperature of the second warm water after heating in the embodiments of the present application are for illustration only. The water temperature of the first warm water, the water temperature of the first warm water after heat recovery, the water temperature of the second warm water, and the water temperature of the second warm water after heating are not limited in the embodiments of the present application.

[0054] In a possible implementation, the heat recovery chiller module 204 is further configured to perform heat recovery on the first warm water after the cold recovery to obtain the first warm water after the heat recovery.

[0055] In order to further improve the efficiency of raw water heating, in a possible embodiment, the raw water heating equipment also includes a third water pump 207, which is respectively connected to the heat recovery chiller module 204 and the medium-temperature chilled water terminal module 205, and is used to transport the first warm water after heat recovery output by the heat recovery chiller module 204 to the medium-temperature chilled water terminal module 205.

[0056] The medium-temperature chilled water terminal module 205 is connected to the first heat exchanger 202 and is used to perform cold recovery on the first warm water after heat recovery and output the first warm water after cold recovery, wherein the temperature of the first warm water after heat recovery is lower than the temperature of the first warm water after cold recovery, and the temperature of the first warm water after cold recovery is lower than the temperature of the second warm water;

[0057] In the embodiment of the present application, the temperature of the first warm water after cold recovery is 18°C. However, this embodiment of the present application does not limit the temperature of the first warm water after cold recovery. Furthermore, the medium-temperature chilled water terminal module 205 in the embodiment of the present application can be an air conditioner, a fresh air unit, a DCC coil, etc. However, this embodiment of the present application does not limit the specific structure of the medium-temperature chilled water terminal module. The medium-temperature chilled water terminal module in the embodiment of the present application can be configured according to specific actual conditions.

[0058] In a possible implementation, the medium-temperature chilled water terminal module 205 is further configured to deliver the first warm water after cold recovery to the heat recovery chiller module 204 .

[0059] The first heat exchanger 202 is used to heat the raw water using the heat of the first warm water after the cold recovery, and output the preheated raw water;

[0060] In the embodiment of the present application, the water temperature of the preheated raw water is 16° C., but the embodiment of the present application does not limit the water temperature of the preheated raw water.

[0061] In order to further improve the efficiency of raw water heating, in a possible embodiment, the raw water heating equipment also includes a fourth water pump 208, which is respectively connected to the medium-temperature chilled water terminal module 205 and the first heat exchanger 202, and is used to transport the first warm water after cold recovery output by the medium-temperature chilled water terminal module 205 to the first heat exchanger 202.

[0062] In a possible implementation example, the first heat exchanger 202 is further configured to heat the raw water using the heat of the first warm water after cold recovery to obtain the first warm water, and output the first warm water to the heat recovery chiller module.

[0063] The second heat exchanger 203 is connected to the first heat exchanger 202 and the heat recovery chiller module 204 respectively, and is used to use the heated second warm water to reheat the preheated raw water and output the heated raw water.

[0064] The temperature of the raw water after heating in the embodiment of the present application is 23° C., but the temperature of the raw water after heating is not limited in the embodiment of the present application.

[0065] In order to further improve the efficiency of raw water heating, in a possible implementation, the raw water heating equipment in the embodiment of the present application also includes a second water pump 209, which is respectively connected to the second heat exchanger 203 and the heat recovery chiller module 204, and is used to transport the heated second warm water output by the heat recovery chiller module 204 to the second heat exchanger 203.

[0066] In a possible embodiment, the second heat exchanger 203 is further configured to use the heated second warm water to perform secondary heating on the preheated raw water to obtain the second warm water, and output the second warm water to the heat recovery chiller module.

[0067] In a possible implementation, the second heat exchanger 203 is further used to transport the heated raw water to the pure water preparation equipment, so that the pure water preparation equipment can use the heated raw water to prepare pure water.

[0068] The raw water heating device in this embodiment comprises three loops. The first loop is a pure water preparation loop, comprising a raw water tank 201, a first water pump 206, a first heat exchanger 202, a second heat exchanger 203, and pure water preparation equipment. The second loop is a raw water preheating loop, comprising a first heat exchanger 202, a medium-temperature chilled water terminal module 205, a third water pump 207, and a heat recovery chiller module 204. The third loop is a raw water reheating loop, comprising a second heat exchanger 203, a heat recovery chiller module 204, and a second water pump 209.

[0069] When the first cycle begins, raw water is pumped from the raw water tank via the first water pump 206 to the first heat exchanger 202. There, it undergoes heat exchange with the first warm water from the second cycle, preheating the raw water. Simultaneously, the natural cooling source in the raw water pre-cools the first warm water. The preheated raw water enters the second heat exchanger 203, a downstream device. The heat recovery chiller module 204 in the third cycle, using the waste heat generated by the first warm water from the second cycle, replenishes the heat, bringing it to the required temperature for the pure water preparation system. This completes one cycle for the entire system.

[0070] Therefore, in the above cycle, the essence of energy saving is to reduce the proportion of high-grade heat sources in the raw water heating process. In the prior art, the heat required for raw water heating is supplied by the heat recovery chiller module. Because the low-temperature hot water supplied by the heat recovery chiller module must take into account other air-conditioning loads, its water supply temperature must be maintained at 36°C or above. In the application embodiment, because the raw water and the first warm water after cold recovery are heat exchanged in the first heat exchanger in advance (free cooling and heat recovery), the low-grade heat source in the first warm water after cold recovery and the cold source in the raw water are fully utilized, reducing the work done by the heat recovery chiller module to produce higher-grade heat sources, thereby achieving good energy-saving effects. In addition, the energy utilization rate is improved in the embodiment of the present application.

[0071] In order to ensure the effect of raw water heating, the medium-temperature chilled water terminal module 205 in the embodiment of the present application is also used to transport part of the first warm water after cold recovery to the heat recovery chiller module 204, so that the heat recovery chiller module 204 can recover heat from the first warm water and part of the first warm water after cold recovery.

[0072] like Figure 3 As shown, Figure 3The medium-temperature chilled water terminal module 205 in the heat recovery unit delivers part of the first warm water after cold recovery to the heat recovery chiller module 204. This ensures that more heat can be obtained to heat the second warm water, further ensuring the heating effect of the raw water.

[0073] Therefore, by adding a preheating heat exchanger, the waste heat in the return water of the medium-temperature chilled water (i.e., the first warm water) is used to preheat the raw water through the preheating heat exchanger, and at the same time, the natural cold source in the raw water is recovered, thereby reducing the energy consumption of this energy transfer link in the heat recovery chiller module, and then heating is carried out through the second heat exchanger to ensure that the water temperature after heating the raw water can meet the requirements. Improve the overall energy efficiency of the cold and hot water system and reduce energy consumption. Therefore, energy costs are saved. For example, taking the area north of the Yangtze River where the raw water temperature is below 12°C for 120 days in winter, assuming that the factory operates 24 hours a day and the raw water flow rate is 1000m 3 / h, the comprehensive COP of the heat recovery chiller module is calculated as 6.5, the recovered cooling power can reach 4700kw, the total daily recovered cooling capacity is 112800kwh, and the daily electricity saving is about 17200kwh. Based on the average electricity price of 0.65 yuan / kwh, after adopting this device, it is estimated that the energy consumption cost can be saved by 11,280 yuan per day, and about 1.35 million yuan can be saved in the whole winter. In the long run, it can save a lot of energy costs for the factory.

[0074] In addition, the device mainly adds equipment such as heat exchangers. Although there will be certain equipment purchase and installation costs in the early stage, the return on investment is high considering the long-term benefits brought by energy saving. 3 / h raw water pre-cooling system is calculated. Its main new equipment is a heat exchanger. At the same time, the corresponding circulation pump head is increased (an additional circulation pump can also be used). Taking into account the pipeline and other supporting facilities, the total investment of the system is about 700,000 to 1 million yuan. According to the annual energy-saving benefits calculated above, it is expected that the cost can be recovered within 1 year. The energy-saving benefits generated each year will become the net profit of the factory, which has good economic benefits.

[0075] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0076] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A raw water heating device, characterized in that: The equipment includes a raw water tank, a first heat exchanger, a second heat exchanger, a heat recovery chiller module and a medium-temperature chilled water terminal module; wherein: The raw water tank is connected to the first heat exchanger and is used to provide raw water; The heat recovery chiller module is connected to the first heat exchanger and the medium-temperature chilled water terminal module, respectively, and is used to recover heat from the first warm water in the heat recovery chiller module and output the first warm water after heat recovery; and to heat the second warm water in the heat recovery chiller module using the heat obtained by the heat recovery and output the heated second warm water; wherein the water temperature of the first warm water is lower than the water temperature of the second warm water, and the water temperature of the first warm water after heat recovery is lower than the water temperature of the first warm water; The medium-temperature chilled water terminal module is connected to the first heat exchanger and is used to perform cold recovery on the first warm water after heat recovery and output the first warm water after cold recovery, wherein the temperature of the first warm water after heat recovery is lower than the temperature of the first warm water after cold recovery, and the temperature of the first warm water after cold recovery is lower than the temperature of the second warm water; The first heat exchanger is used to heat the raw water using the heat of the first warm water after the cold recovery, and output the preheated raw water; The second heat exchanger is connected to the first heat exchanger and the heat recovery chiller module respectively, and is used to use the heated second warm water to secondary heat the preheated raw water and output the heated raw water.

2. The device according to claim 1, characterized in that The first heat exchanger is further used for: The raw water is heated by utilizing the heat of the first warm water after cold recovery to obtain the first warm water, and the first warm water is output to the heat recovery chiller module.

3. The device according to claim 1, characterized in that The second heat exchanger is further used for: The preheated raw water is heated twice using the heated second warm water to obtain the second warm water, and the second warm water is output to the heat recovery chiller module.

4. The device according to claim 1, characterized in that The device further comprises: The first water pump is connected to the raw water tank and the first heat exchanger respectively, and is used to transport the raw water provided by the raw water tank to the first heat exchanger.

5. The device according to claim 1, characterized in that The device further comprises: The second water pump is connected to the second heat exchanger and the heat recovery chiller module respectively, and is used to transport the heated second warm water output by the heat recovery chiller module to the second heat exchanger.

6. The device according to claim 1, characterized in that The device further comprises: The third water pump is connected to the heat recovery chiller module and the medium-temperature chilled water terminal module respectively, and is used to transport the first warm water after heat recovery output by the heat recovery chiller module to the medium-temperature chilled water terminal module.

7. The device according to claim 1, characterized in that The device further comprises: The fourth water pump is connected to the medium-temperature chilled water terminal module and the first heat exchanger respectively, and is used to transport the first warm water after cold recovery output by the medium-temperature chilled water terminal module to the first heat exchanger.

8. The device according to claim 1, characterized in that The medium-temperature chilled water terminal module is also used for: The first warm water after the cold recovery is delivered to the heat recovery chiller module.

9. The device according to claim 1, characterized in that The heat recovery chiller module is also used to: The first warm water after cold recovery is subjected to heat recovery to obtain the first warm water after heat recovery.

10. The device according to claim 1, characterized in that The second heat exchanger is further used for: The heated raw water is transported to a pure water preparation device so that the pure water preparation device can use the heated raw water to prepare pure water.

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