Heat accumulating solar light and heat preheating boiler water supplementing system and boiler system

Abstract

This utility model relates to a heat storage type solar thermal preheating boiler water supply system and a boiler system. The heat storage type solar thermal preheating boiler water supply system includes: a heat storage tank connected to a first heat transfer oil outlet pipe, a first heat transfer oil return pipe, a second heat transfer oil outlet pipe, and a second heat transfer oil return pipe; a heat storage oil pump and an expansion tank connected to the first heat transfer oil outlet pipe; a heat transfer oil pump connected to the second heat transfer oil outlet pipe; at least one set of solar collector arrays; at least one heat exchanger; and a boiler slag cooler connected to a boiler water supply inlet pipe and a slag cooler outlet pipe, with the two ends of a second connecting pipe connected to the slag cooler outlet pipe and a boiler water supply inlet pipe, respectively. This utility model effectively solves the problems of high fuel consumption for boiler water supply, poor heat transfer performance, low heat capacity, poor thermal stability of the heat exchange medium when using solar preheating, easy generation of steam at high temperatures affecting system stability, and system susceptibility to the lack of sunlight.

Description

Technical Field

[0001] This utility model relates to the field of boilers, and in particular to a heat storage type solar thermal preheating boiler water supply system and boiler system. Background Technology

[0002] In modern industrial production, boiler systems are crucial equipment for providing heat energy. Traditional boiler feedwater heating methods typically rely on fuel consumption, leading to energy waste and environmental pollution.

[0003] With technological advancements, the efficiency of solar thermal technology is continuously improving, while costs are gradually decreasing. Especially in large-scale industrial applications, the installation and operating costs of solar collectors have significantly decreased, and more companies will choose solar energy as their primary energy source in the future. Furthermore, solar thermal systems incorporating intelligent control technology will gradually become mainstream, enabling more efficient energy management. Currently, solar thermal utilization has already demonstrated its potential in multiple fields. Biomass energy, as an important renewable energy source, boasts advantages such as abundant resources and sustainability. Combining the two will contribute to the efficient utilization of resources and sustainable environmental development.

[0004] Currently, solar thermal technology is increasingly being used in industry, particularly in areas such as boiler feedwater and steam generation. However, most existing solar thermal systems use water as the heat transfer medium, which is prone to generating steam at high temperatures, affecting system stability.

[0005] For example, patent CN207527556U discloses a system for preheating boiler feedwater using solar energy, including a water softening station, a water tank, a deaerator, and a boiler. Softened water produced by the water softening station is transported through the water tank to the deaerator for heating and deoxygenation. The deoxygenated softened water flows out of the deaerator and enters the boiler through the boiler inlet pipe. It also includes a solar preheating system, which includes a solar heat exchanger and a partition at the bottom of the water tank, dividing the tank into a left and right section. The left water tank is connected to the water softening station via a normal-temperature water supply pipe. The drain outlet of the left water tank is connected to the inlet of the solar heat exchanger via a preheating inlet pipe, and the outlet of the solar heat exchanger is connected to the right water tank via a preheating drain pipe. The drain outlet of the right water tank is connected to the deaerator via a deaerator inlet pipe. The advantage of this patent is that the normal-temperature softened water is utilized after being circulated and heated by solar energy, saving steam consumption for the deaerator's thermal deoxygenation and also saving natural gas for the boiler. However, this patent has the following disadvantages:

[0006] (1) This system is a direct mixing heat exchange system. Water is used as the heat exchange medium. After being heated by the solar collector, the water is mixed with the makeup water and sent to the deaerator. Although it can utilize solar heat to a certain extent, the heat transfer performance of the heat exchange medium is poor, the heat capacity is small, and the thermal stability is poor. In high-temperature environments such as long sunshine hours and high solar radiation intensity in summer, steam is easily generated, which affects the stability of the system and results in low system thermal efficiency.

[0007] (2) The system has no heat storage components, and the heat exchange is affected by the external weather. The water tank outlet temperature fluctuates greatly. At the same time, the system is affected by the lack of light, and cannot output high-temperature water at a stable temperature at night or on cloudy days.

[0008] (3) The scale of the solar collectors in the system is small and the preheating is limited.

[0009] Patent CN102052771A discloses a solar-powered preheating device for boiler water, comprising a solar-insulated water tank, an insulated hot water storage tank, and a solar absorption heating device. The solar absorption heating device is connected to the insulated hot water storage tank. The solar-insulated water tank includes a body, which is connected to the insulated hot water storage tank via a first insulated pipe. The insulated hot water storage tank is connected to the boiler's water injection pipe via a second insulated pipe. This patent utilizes solar energy to preheat cold water, thus significantly saving fuel compared to ordinary boilers when heating the same amount of water to a specified temperature. Calculations show that boilers equipped with this patented solar-powered preheating device save 10%-50% on coal, 2%-10% on electricity, and reduce carbon dioxide emissions and particulate matter emissions by 10%-50% compared to ordinary boilers. However, this patent has the following drawbacks:

[0010] (1) Although the system has changed the form of the system compared with patent CN207527556U, its essence is still to use water as the heat exchange medium of the system. The water heated by the solar collector is directly sent to the boiler through the water storage tank. Although it can utilize solar heat to a certain extent, the heat transfer performance of the heat exchange medium is poor, the heat capacity is small, and the thermal stability is poor. In high-temperature environments such as long sunshine hours and high solar radiation intensity in summer, steam is easily generated, which affects the stability of the system and thus leads to low system thermal efficiency.

[0011] (2) The system has no heat storage components, and the heat exchange is affected by the external weather. The water tank outlet temperature fluctuates greatly. At the same time, the system is affected by the lack of light, and cannot output high-temperature water at a stable temperature at night or on cloudy days.

[0012] (3) The scale of the solar collectors in the system is small and the preheating is limited. Utility Model Content

[0013] The purpose of this utility model is to provide a heat storage type solar thermal preheating boiler water supply system and boiler system, which can effectively solve the problems of high fuel consumption for boiler water supply, poor heat transfer performance of heat exchange medium when using solar energy for preheating, small heat capacity, poor thermal stability, easy generation of steam at high temperature, affecting system stability, and the system being affected by the lack of sunlight.

[0014] The purpose of this utility model is achieved as follows:

[0015] This utility model provides a heat storage type solar thermal preheating boiler water supply system, including:

[0016] A heat storage tank is connected to a first heat transfer oil outlet pipe, a first heat transfer oil return pipe, a second heat transfer oil outlet pipe, and a second heat transfer oil return pipe. A heat storage oil pump and an expansion tank are connected to the first heat transfer oil outlet pipe, and a heat transfer oil pump is connected to the second heat transfer oil outlet pipe.

[0017] At least one set of solar thermal collector arrays, with each set of solar thermal collector arrays connected at both ends to the first heat transfer oil outlet pipe and the first heat transfer oil return pipe, respectively;

[0018] At least one heat exchanger, each heat exchanger having a first heat exchange channel and a second heat exchange channel, the two ends of the first heat exchange channel being connected in series in a first connecting pipe, the two ends of the first connecting pipe being connected to a second heat transfer oil outlet pipe and a second heat transfer oil return pipe, respectively.

[0019] The boiler slag cooler is connected to a boiler feed water inlet pipe and a slag cooler outlet pipe. The boiler feed water inlet pipe is used to introduce room temperature water. The two ends of the second heat exchange channel are connected in series in the second connecting pipe. The two ends of the second connecting pipe are respectively connected to the slag cooler outlet pipe and a boiler feed water inlet pipe. The boiler feed water inlet pipe is used to connect to the boiler feed water heating device.

[0020] In a preferred embodiment of the present invention, the heat storage tank includes a tank body and an insulation layer wrapped around the tank body.

[0021] In a preferred embodiment of the present invention, each solar thermal collector array includes multiple sets of thermal collector structures connected in parallel, and each set of thermal collector structures includes multiple solar thermal collectors connected in series.

[0022] In a preferred embodiment of this utility model, the solar collector is a trough collector.

[0023] In a preferred embodiment of this utility model, at least two sets of solar thermal collector arrays are connected in parallel between the first heat transfer oil outlet pipe and the first heat transfer oil return pipe.

[0024] In a preferred embodiment of this utility model, the number of solar collector arrays is two, and the number of heat exchangers is two.

[0025] In a preferred embodiment of this utility model, there are two heat storage oil pumps, which are connected in parallel to the first heat transfer oil outlet pipe.

[0026] In a preferred embodiment of this invention, the expansion tank is positioned at a height higher than the solar collector array and also higher than the heat storage tank.

[0027] In a preferred embodiment of the present invention, the water supply system for the thermal storage type solar thermal preheating boiler also includes a controller, which is electrically connected to the thermal storage oil pump and the thermal transfer oil pump.

[0028] This utility model also provides a boiler system, including a boiler, a water supply heating device, and the above-mentioned heat storage type solar thermal preheating boiler water supply system; the boiler water supply inlet pipe is used to connect the water supply heating device, and the water supply heating device is connected to the boiler through corresponding pipelines.

[0029] As described above, the solar thermal preheating boiler feedwater system and boiler system of this invention rely on solar collector arrays to collect solar energy without depending on fuel consumption, thus saving energy and reducing environmental pollution. Simultaneously, the system uses heat transfer oil as the heat exchange medium, which has better thermal stability and heat transfer properties, and does not generate steam at high temperatures, contributing to system stability. Furthermore, the inclusion of a heat storage tank as a heat storage device solves the problem of large temperature fluctuations in the heat exchange medium under conditions of no sunlight, such as at night or on cloudy days, achieving efficient preheating of boiler feedwater. The entire feedwater system has advantages such as simple structure, high energy utilization rate, and environmental friendliness, making it suitable for large-scale industrial applications and possessing good market prospects, providing a new approach to the utilization of renewable energy. Attached Figure Description

[0030] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0031] Figure 1 A schematic diagram of the water supply system for the thermal storage type solar thermal preheating boiler provided by this utility model.

[0032] Explanation of icon numbers:

[0033] 1. Heat storage tank; 11. First heat transfer oil outlet pipe; 12. First heat transfer oil return pipe; 13. Second heat transfer oil outlet pipe; 14. Second heat transfer oil return pipe; 15. Heat storage oil pump; 151. First heat storage oil pump; 152. Second heat storage oil pump; 153. Parallel pipeline; 16. Expansion tank; 17. Heat transfer oil pump;

[0034] 2. Solar thermal collector array; 21. Solar thermal collector;

[0035] 3. Heat exchanger; 31. First connecting pipe; 32. Second connecting pipe;

[0036] 4. Boiler slag cooler; 41. Boiler water inlet pipe; 42. Slag cooler outlet pipe;

[0037] 5. Boiler water supply pipe. Detailed Implementation

[0038] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0039] like Figure 1 As shown, this embodiment provides a water supply system for a thermal storage type solar thermal preheating boiler, including:

[0040] A heat storage tank 1 is connected to a first heat transfer oil outlet pipe 11, a first heat transfer oil return pipe 12, a second heat transfer oil outlet pipe 13, and a second heat transfer oil return pipe 14. A heat storage oil pump 15 and an expansion tank 16 are connected to the first heat transfer oil outlet pipe 11, and a heat transfer oil pump 17 is connected to the second heat transfer oil outlet pipe 13.

[0041] At least one set of solar thermal collector array 2, with each set of solar thermal collector array 2 connected at both ends to the first heat transfer oil outlet pipe 11 and the first heat transfer oil return pipe 12, respectively;

[0042] At least one heat exchanger 3, each heat exchanger 3 having a first heat exchange channel and a second heat exchange channel, the two ends of the first heat exchange channel being connected in series in a first connecting pipe 31, the two ends of the first connecting pipe 31 being connected to a second heat transfer oil outlet pipe 13 and a second heat transfer oil return pipe 14 respectively.

[0043] The boiler slag cooler 4 is connected to a boiler water supply inlet pipe 541 and a slag cooler outlet pipe 42. The boiler water supply inlet pipe 541 is used to introduce room temperature water. The two ends of the second heat exchange channel are connected in series in the second connecting pipe 32. The two ends of the second connecting pipe 32 are respectively connected to the slag cooler outlet pipe 42 and a boiler water supply inlet pipe 541. The boiler water supply inlet pipe 541 is used to connect to the boiler water supply heating device.

[0044] The heat storage tank 1 has a heat storage function and is used to temporarily store heat transfer oil. The boiler slag cooler 4 has heat exchange pipes inside, and the boiler water inlet pipe 541 and the slag cooler outlet pipe 42 are connected to both ends of the heat exchange pipes. During operation, the heat transfer oil in the heat storage tank 1 is pumped by the heat storage oil pump 15 and enters the corresponding solar collector array 2 through the first heat transfer oil outlet pipe 11. After absorbing solar heat, it returns to the heat storage tank 1 through the first heat transfer oil return pipe 12. Under the pumping action of the heat transfer oil pump 17, the heat transfer oil in the heat storage tank 1 enters the first heat exchange channel in the corresponding heat exchanger 3 through the second heat transfer oil outlet pipe 13 and the corresponding first connecting pipe 31. Normal temperature water enters the heat exchange pipe of the boiler slag cooler 4 through the boiler water inlet pipe 541. After being heated by the heat of the slag in the boiler slag cooler 4, it flows out through the slag cooler outlet pipe 42 and then enters the second heat exchange channel in the corresponding heat exchanger 3 through the corresponding second connecting pipe 32. After heat exchange in the heat exchanger 3, it enters the boiler water supply heating device through the boiler water inlet pipe 541 and then enters the boiler.

[0045] Therefore, the boiler feedwater system of this application relies on the solar thermal collector array 2 to collect solar energy, without depending on fuel consumption, thus saving energy and reducing environmental pollution. Simultaneously, the system uses heat transfer oil, which has better thermal stability and heat transfer properties, and does not generate steam at high temperatures, contributing to system stability. Furthermore, the inclusion of a heat storage tank 1 as a heat storage device solves the problem of large temperature fluctuations in the heat exchange medium under conditions of no sunlight, such as at night or on cloudy days, achieving efficient preheating of the boiler feedwater. The entire feedwater system has advantages such as simple structure, high energy utilization rate, and environmental friendliness, making it suitable for large-scale industrial applications and possessing good market prospects, providing a new approach to the utilization of renewable energy.

[0046] In a specific implementation, the heat storage tank 1 includes a tank body and an insulation layer wrapped around the tank body.

[0047] The heat storage tank 1 is designed to store excess heat, stabilize the temperature of the heat exchange medium (heat transfer oil), and ensure that it can still provide heat support on cloudy days or at night when there is no sunlight. The capacity of the heat storage tank 1 should be designed according to the system's heat demand and the seasonal fluctuations of solar thermal collection to achieve optimal energy storage performance. To facilitate the replenishment, venting, and maintenance of the heat transfer oil, the heat storage tank 1 is generally positioned at a low level. This design ensures that the system can operate normally under any circumstances, enhancing the system's reliability.

[0048] Optionally, each solar collector array 2 includes multiple collector structures connected in parallel, and each collector structure includes multiple solar collectors 21 connected in series. The solar collectors 21 in a single collector structure are connected in series, and the heat transfer oil gradually heats up through the series-connected solar collectors 21, improving the efficiency of thermal energy utilization. The heat transfer oil pipelines between the collector structures are arranged in parallel, with the parallel sections arranged in the same direction, which helps to achieve hydraulic balance and improve the reliability of the entire system.

[0049] The type of solar collector 21 can be determined according to actual needs; for example, a parabolic trough collector can be used.

[0050] Optionally, at least two sets of solar collector arrays 2 are connected in parallel between the first heat transfer oil outlet pipe 11 and the first heat transfer oil return pipe 12. The number of heat exchangers 3 is at least two.

[0051] The arrangement and design of the solar collectors 21 are crucial to the overall efficiency of the system. By designing at least two sets of solar collector arrays 2, solar radiation can be captured to maximize the temperature of the heat transfer oil, thereby increasing the boiler feedwater temperature. The aforementioned heat exchangers 3 are also designed in at least two configurations to improve heat exchange efficiency and better utilize the heat from the heat transfer oil.

[0052] The specific number of solar collector arrays 2 and heat exchangers 3 can be determined according to actual needs. For example, in a specific embodiment, there are two solar collector arrays 2 and two heat exchangers 3. The heat exchangers 3 are specifically oil-water heat exchangers, used to exchange heat between the heat transfer oil and boiler feedwater. Two oil-water heat exchangers are installed, each with a power of, for example, 6400kW, which can meet the boiler feedwater requirements when operating simultaneously. The design of the heat exchangers 3 should consider temperature gradients and flow rate regulation to optimize heat exchange efficiency. High-efficiency heat exchange materials and a reasonable flow channel design are selected to further improve the performance of the heat exchangers 3.

[0053] Optionally, the solar collector array 2 is arranged on the roof of the dry material shed. For example, when two sets of solar collector arrays 2 are installed, solar trough collectors are arranged on the roof of the dry material shed, with the east and west sides each divided into areas A and B. The two sets of solar collector arrays 2 are located in areas A and B respectively. Area A is designed with 82 rows, with 33 solar collectors 21 in each row; Area B is designed with 82 rows, with 32 solar collectors 21 in each row, for a total of 5330 solar collectors 21. This layout design fully considers the lighting conditions and space utilization, improving the overall working efficiency of the solar collectors 21.

[0054] The spacing between each solar collector 21 is designed to be 1.55 meters to optimize sunlight reception and heat transfer efficiency. The angle and orientation of the solar collectors 21 should be optimized according to local solar conditions to maximize heat collection efficiency.

[0055] Each solar collector 21 is designed with an average thermal power of 1.2kW, resulting in a total thermal power of 6396kW. During the midday hours when sunlight is intense, a single solar collector 21 can generate up to 1.6kW of thermal power, enough to raise the temperature of boiler feedwater from 40℃ to 101℃ at a capacity of 120t / h. This design not only meets daily production needs but also ensures system reliability under extreme weather conditions. Of course, the specific number and power of the solar collectors 21 will be designed according to actual conditions; this embodiment is merely an example.

[0056] Alternatively, the number of thermal storage oil pumps 15 may be two, and they may be connected in parallel to the first thermal oil outlet pipe 11.

[0057] Specifically, two thermal oil pumps 15 are connected in parallel, designated as the first thermal oil pump 151 and the second thermal oil pump 152. The first thermal oil pump 151 is connected in series in the first heat transfer oil outlet pipe 11, and the second thermal oil pump 152 is connected in series in a parallel pipeline 153. The two ends of the parallel pipeline 153 are respectively connected to the first heat transfer oil outlet pipes 11 at both ends of the first thermal oil pump 151. During operation, one thermal oil pump 15 is used first, while the other thermal oil pump 15 serves as a backup, ensuring stable operation of the system.

[0058] The expansion tank 16 is connected to the first heat transfer oil outlet pipe 11 via a corresponding pipeline and is located between the heat storage tank 1 and the heat storage oil pump 15. The structure of the expansion tank 16 is existing technology, and it plays a role in buffering pressure fluctuations and partially supplying water in the system. Generally, only one heat transfer oil pump 17 is required.

[0059] Generally, the expansion tank 16 is positioned at a height higher than the solar collector array 2 and also higher than the heat storage tank 1.

[0060] An expansion tank 16 is used for pressure control. The expansion tank 16 is positioned high on the roof near the solar collector 21, approximately 2 meters above the solar collector array 2, facilitating the flow of heat transfer oil. This high-positioning of the expansion tank 16 effectively controls the system pressure, ensuring stable operation of the heat transfer oil at high temperatures. Two thermal storage oil pumps 15 (one in operation and one on standby) are installed to ensure stable system operation. Both the expansion tank 16 and the thermal storage tank 1 are located in convenient positions for easy maintenance and management. The selection and configuration of the thermal storage oil pump 15 and the heat transfer oil pump 17 should be optimized based on the system's flow and pressure requirements to improve system efficiency.

[0061] Furthermore, the thermal storage solar thermal preheating boiler feedwater system also includes a controller, which is electrically connected to the thermal storage oil pump 15 and the thermal oil pump 17 to achieve automated intelligent control. The thermal oil flows in the solar collector 21, absorbs solar heat, and after its temperature rises, it heats the boiler feedwater through the heat exchanger 3. The start-up, shutdown, and flow control of the thermal storage oil pump 15 and the thermal oil pump 17 are automatically adjusted by feedback signals from temperature sensors to ensure the stability and efficiency of the system.

[0062] Optionally, a first temperature sensor is installed on the heat storage tank 1 to detect the temperature of the heat transfer oil inside the tank; a second temperature sensor is installed on the boiler feedwater inlet pipe 541 to detect the boiler feedwater temperature output from the pipe 541; the controller is also electrically connected to the first and second temperature sensors. Further optionally, flow sensors can be installed on both the first and second heat transfer oil outlet pipes 11 and 13 to detect the flow rate of the heat transfer oil at each point; the controller is also electrically connected to the flow sensors. This allows for real-time monitoring of the heat transfer oil temperature, flow rate, and boiler feedwater temperature, and optimizes operating efficiency through an automatic control system. The entire system may also include data recording and alarm functions to promptly detect system anomalies and take corresponding measures.

[0063] In a specific example, this system can raise the temperature of boiler feedwater from 120 t / h and 40°C to 86°C, achieving higher heating efficiency during peak heat demand periods and significantly reducing the energy consumption of traditional heating systems. Performance monitoring data during system operation should be analyzed regularly to optimize system configuration and operating strategies.

[0064] In summary, the above-mentioned solar thermal preheating boiler feedwater system has the following advantages:

[0065] (1) The entire system comprises three parts: a solar thermal array system (including at least one solar collector array 2), a thermal oil storage system (including a storage tank 1, an expansion tank 16, a thermal oil pump 15, a thermal oil pump 17, and related pipelines), and an oil-water heat exchange system (including at least one heat exchanger 3 and related pipelines). The core of the solar thermal system is to use thermal oil as a heat transfer medium to absorb solar heat in the solar collector array 2, enabling the immediate use of solar thermal energy for heating boiler feedwater at ambient temperature. This reduces the steam extraction rate of the low-pressure heater and deaerator, thereby reducing the biomass fuel consumption of the boiler and achieving a complementary effect between biomass energy and solar energy. The collected solar heat then enters the storage tank 1, which eliminates fluctuations in solar heat, and the thermal oil in the storage tank 1, which has a stable temperature, preheats the boiler feedwater through the heat exchanger 3. The design of the thermal oil system emphasizes efficient heat transfer. The high-level arrangement of the expansion tank 16 effectively controls the system pressure, ensuring stable operation of the thermal oil at high temperatures.

[0066] (2) This system utilizes a combination of a biomass fuel boiler and a solar collector array 2 to achieve efficient preheating of boiler feedwater, thereby improving the operating efficiency of traditional boilers, reducing the amount of biomass fuel used, reducing fuel consumption, increasing energy utilization, and minimizing its environmental impact. Furthermore, the solar collector array 2 is installed on the roof of the dry material shed storing biomass fuel, achieving rational resource utilization. Through innovative heat transfer oil circulation and storage methods, this system effectively reduces biomass fuel consumption and flexibly allocates energy supply under conditions of no sunlight, such as nighttime or cloudy days, effectively solving the problem of large temperature fluctuations in the heat exchange medium under conditions of no sunlight, such as nighttime or cloudy days. Heat transfer oil has high thermal stability and good heat transfer characteristics, enabling safe operation at higher temperatures, making it more suitable for high-temperature hot water supply. Combining the solar thermal system with heat transfer oil technology can effectively utilize solar energy to provide a heat source for boiler feedwater, thereby reducing dependence on fossil fuels. Optionally, during periods of no sunlight, such as nighttime or cloudy days, the boiler feedwater uses the original low-pressure steam extraction heating system, with flexible turbine allocation.

[0067] (3) A controller and corresponding sensors are installed to form an intelligent boiler feedwater system. The boiler feedwater system can adjust the amount of steam used for heating the low-pressure heater and deaerator according to the feedwater temperature, thereby realizing intelligent thermal energy management. The system can autonomously adjust under different climatic conditions to maximize the utilization of solar thermal energy.

[0068] (4) Economic analysis:

[0069] Cost-Benefit Analysis: The initial investment for the boiler feedwater scheme using a solar thermal system mainly includes the procurement and installation costs of the solar collector 21, heat exchanger 3, thermal oil pump 15, thermal oil pump 17, and control system. In the long term, the system will significantly reduce the consumption of traditional energy sources, save operating costs, and the investment payback period can be within 3-5 years. Environmental Impact Assessment: This system effectively utilizes solar energy, reduces dependence on fossil fuels, lowers greenhouse gas emissions, and helps improve environmental quality. Furthermore, the system's operation has a relatively small impact on the surrounding environment. Social Benefits: While improving the energy efficiency of enterprises, the solar thermal system also raises public awareness of environmental protection by promoting the application of solar energy.

[0070] Furthermore, this application also provides a boiler system, including a boiler, a water supply heating device, and the aforementioned solar thermal preheating boiler water supply system; the boiler water supply inlet pipe 541 is used to connect the water supply heating device, which is connected to the boiler through corresponding pipelines. The water supply heating device here is an existing structure, generally including a low-pressure heater, a deaerator, and a high-pressure heater. The boiler water supply inlet pipe 541 sequentially introduces the heat-exchanged water into the low-pressure heater, deaerator, and high-pressure heater in the water supply heating device, and then it flows into the boiler.

[0071] This boiler system has the same advantages as the boiler feedwater system described above, and will not be repeated here.

[0072] The above are merely illustrative embodiments of this utility model and are not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A heat storage type solar thermal preheating boiler water supply system, characterized in that, include: A heat storage tank is connected to a first heat transfer oil outlet pipe, a first heat transfer oil return pipe, a second heat transfer oil outlet pipe, and a second heat transfer oil return pipe. A heat storage oil pump and an expansion tank are connected to the first heat transfer oil outlet pipe, and a heat transfer oil pump is connected to the second heat transfer oil outlet pipe. At least one set of solar thermal collector arrays, with each set of solar thermal collector arrays connected at both ends to the first heat transfer oil outlet pipe and the first heat transfer oil return pipe, respectively. At least one heat exchanger, each heat exchanger having a first heat exchange channel and a second heat exchange channel, the two ends of the first heat exchange channel being connected in series in a first connecting pipe, the two ends of the first connecting pipe being connected to the second heat transfer oil outlet pipe and the second heat transfer oil return pipe, respectively. A boiler slag cooler is connected to a boiler feedwater inlet pipe and a slag cooler outlet pipe. The boiler feedwater inlet pipe is used to introduce room temperature water. The two ends of the second heat exchange channel are connected in series in a second connecting pipe. The two ends of the second connecting pipe are respectively connected to the slag cooler outlet pipe and a boiler feedwater inlet pipe. The boiler feedwater inlet pipe is used to connect to the boiler's feedwater heating device.

2. The water supply system for a solar thermal preheating boiler with thermal storage as described in claim 1, characterized in that, The heat storage tank includes a tank body and an insulation layer wrapped around the tank body.

3. The water supply system for a heat storage type solar thermal preheating boiler as described in claim 1, characterized in that, Each of the solar collector arrays comprises multiple sets of collector structures connected in parallel, and each set of collector structures comprises multiple solar collectors connected in series.

4. The water supply system for a solar thermal preheating boiler as described in claim 3, characterized in that, The solar collector is a parabolic trough collector.

5. The water supply system for a heat storage type solar thermal preheating boiler as described in claim 1, characterized in that, At least two sets of solar thermal collector arrays are connected in parallel between the first heat transfer oil outlet pipe and the first heat transfer oil return pipe.

6. The water supply system for a thermal storage type solar thermal preheating boiler as described in claim 1, characterized in that, The solar collector array consists of two groups, and the heat exchanger consists of two units.

7. The water supply system for a solar thermal preheating boiler with thermal storage as described in claim 1, characterized in that, There are two thermal storage oil pumps, which are connected in parallel to the first thermal oil outlet pipe.

8. The water supply system for a solar thermal preheating boiler with thermal storage as described in claim 1, characterized in that, The expansion tank is positioned at a height higher than the solar collector array and also higher than the heat storage tank.

9. The water supply system for a thermal storage type solar thermal preheating boiler as described in claim 1, characterized in that, The thermal storage type solar thermal preheating boiler water supply system also includes a controller, which is electrically connected to the thermal storage oil pump and the thermal transfer oil pump.

10. A boiler system, characterized in that, It includes a boiler, a water supply heating device, and a heat storage type solar thermal preheating boiler water supply system as described in any one of claims 1-9; the boiler water supply inlet pipe is used to connect to the water supply heating device.

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