A denitrification reducing agent heating system

Abstract

This utility model discloses a heating system for a denitrification reducing agent, relating to the field of reducing agent preparation technology in denitrification processes. The system includes a component to be heated, with a heating pipe inside; an inlet pipe connected at one end to the heating pipe and at the other end to a water supply pipe; a first booster pump located in the inlet pipe; an outlet pipe connected at one end to the heating pipe and at the other end to a return water pipe; the temperature in the return water pipe is lower than the temperature in the water supply pipe; a bypass pipe connected at one end to the heating pipe and at the other end to the return water pipe; a monitoring module located inside the component to be heated; and a control module located in the bypass pipe, coupled to the monitoring module, capable of controlling the on / off state of the bypass pipe based on the status information collected by the monitoring module. This denitrification reducing agent heating system facilitates heating and heat preservation of the reducing agent during the preparation process, reducing energy waste and cost; and simultaneously improving the safety of the reducing agent preparation process.

Description

Technical Field

[0001] This utility model relates to the field of reducing agent preparation technology in denitrification process, and in particular to a denitrification reducing agent heating system. Background Technology

[0002] Existing gas-steam combined cycle units commonly use SCR (Selective Catalytic Reduction) technology for denitrification, with urea solution as the common reducing agent. In current urea preparation processes, the urea dissolving tank is typically located in the reducing agent preparation room within the newly built equipment room. Steam is used to heat the demineralized water, and solid urea is dissolved in the dissolving tank to form a 32.5% urea solution.

[0003] However, the process of preparing urea solution using steam heating is challenging due to the high steam temperature, making control difficult and prone to phenomena such as steam-water embrittlement and violent vibrations, which severely affect the stability of the reducing agent preparation in the denitrification system. Furthermore, the steam heating system has a complex operating procedure, is difficult to operate on-site, requires high equipment reliability and safety, and incurs significant costs. Maintaining high-quality steam heating and system temperature also results in substantial energy waste.

[0004] Therefore, there is an urgent need for a denitrification reducing agent heating system to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a heating system for denitrification reducing agents, which facilitates heating and heat preservation of the reducing agent during the preparation process, reduces energy waste and cost input, and improves the safety of the reducing agent preparation process.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a denitrification reducing agent heating system, which includes a component to be heated, an inlet pipe, a first booster pump, an outlet pipe, a bypass pipe, a monitoring module, and a control module. The system includes: a component to be heated, internally equipped with a heating pipe; an inlet pipe, one end of which is connected to the heating pipe, and the other end of which is connected to the water supply pipe of the power plant's hot water system; a first booster pump, located in the inlet pipe, used to pressurize the water from the water supply pipe and deliver it to the heating pipe; an outlet pipe, one end of which is connected to the end of the heating pipe furthest from the inlet pipe, and the other end of which is connected to the return water pipe of the power plant's hot water system; the temperature in the return water pipe is lower than the temperature in the water supply pipe; a bypass pipe, one end of which is connected to the heating pipe, and the other end of which is connected to the return water pipe of the hot water system; a monitoring module, at least partially located inside the component to be heated, used to collect the internal status information of the component to be heated; and a control module, located in the bypass pipe; the control module is coupled to the monitoring module and can control the opening and closing of the bypass pipe based on the internal status information of the component to be heated collected by the monitoring module.

[0008] In some embodiments, the state information inside the heating component includes pressure information and temperature information.

[0009] In some embodiments, the monitoring module includes a pressure monitor and a temperature monitor; the pressure monitor is used to collect the pressure information inside the heating component; the temperature monitor is used to collect the temperature information inside the heating component.

[0010] In some embodiments, the control module includes a switching valve and a controller coupled to each other; the switching valve is disposed in the bypass pipeline; the pressure monitor and the temperature monitor are respectively coupled to the controller; the controller can control the opening and closing state of the switching valve according to the pressure information inside the component to be heated collected by the pressure monitor and the temperature information inside the component to be heated collected by the temperature monitor.

[0011] In some embodiments, the controller is an ARM microcontroller or a programmable logic controller.

[0012] In some embodiments, the denitrification reducing agent heating system further includes a second booster pump, which is disposed in the water inlet pipe and connected in parallel with the first booster pump.

[0013] In some embodiments, the denitrification reducing agent heating system further includes a third booster pump, disposed in the outlet water pipe, for pressurizing the water from the heating pipe and delivering it to the return water pipe of the hot water system.

[0014] In some embodiments, the heating pipe has a spiral structure.

[0015] In some embodiments, the temperature range within the water supply pipeline of the hot water system is 120°C to 130°C.

[0016] In some embodiments, the temperature range in the return water pipe of the hot water system is 70°C to 80°C.

[0017] The beneficial effects of this utility model are:

[0018] This utility model provides a denitrification reducing agent heating system. It includes a heating pipe installed inside the component to be heated, an inlet pipe with one end connected to the heating pipe and the other end connected to the water supply pipe of a thermal power plant's hot water system, a first booster pump on the inlet pipe to pressurize and deliver water from the water supply pipe to the heating pipe, an outlet pipe with one end connected to the heating pipe and the other end connected to the return pipe of the thermal power plant's hot water system, and a bypass pipe with one end connected to the heating pipe and the other end connected to the return pipe of the hot water system. Additionally, a monitoring module capable of collecting internal status information of the component to be heated is provided, and a control module coupled to the monitoring module on the bypass pipe, capable of controlling the on / off state of the bypass pipe based on the internal status information of the component to be heated collected by the monitoring module, is installed on the bypass pipe. This design allows for efficient denitrification reducing agent preparation. The reducing agent raw material is placed inside the component to be heated. High-temperature water from the power plant's hot water supply system is then delivered to the heating pipe via the inlet pipe and a first booster pump. As the hot water flows through the heating pipe, it exchanges heat with the component, heating it to meet the temperature requirements for reducing agent preparation. The cooled water, after heat exchange, returns to the power plant's hot water system via the outlet pipe, reheating and forming a complete heating cycle. This process eliminates the need for additional heating devices, utilizing the power plant's hot water system as a heat source, effectively preventing heat waste and reducing costs. Furthermore, the heating system is simple in structure, easy to control, and convenient to operate. Meanwhile, when the internal state of the component to be heated is abnormal (such as excessive internal pressure or insufficient hot water supply leading to excessively low internal temperature), the monitoring module and control module can work together to control the opening and closing of the bypass pipe, and promptly heat preservation or depressurization of the component to be heated. This facilitates the heat preservation operation of the component to be heated and improves the safety of the reducing agent preparation process. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a denitrification reducing agent heating system provided in a specific embodiment of this utility model.

[0020] In the picture:

[0021] 1. Component to be heated; 2. Heating pipe; 3. Inlet pipe; 4. Hot water system; 41. Water supply pipe; 42. Return pipe; 51. First booster pump; 52. Second booster pump; 6. Outlet pipe; 7. Bypass pipe; 8. Monitoring module; 81. Pressure monitor; 82. Temperature monitor; 9. Control module. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0026] like Figure 1As shown, this embodiment provides a denitrification reducing agent heating system. The denitrification reducing agent heating system includes a component to be heated 1, an inlet pipe 3, a first booster pump 51, an outlet pipe 6, a bypass pipe 7, a monitoring module 8, and a control module 9.

[0027] The aforementioned component to be heated 1 has a heating pipe 2 installed inside. This component to be heated 1 can be, for example, a demineralized water tank, a urea dissolving tank, a urea storage tank, or a heat tracing component for a denitrification pipeline. It is easy to understand that placing the heating pipe 2 inside the component to be heated 1 is for better heating effect. In practical applications, the heating pipe 2 can also be placed outside the component to be heated 1, and positioned close to the part of the component to be heated, as long as heat exchange between the heating pipe 2 and the component to be heated 1 can be achieved. Those skilled in the art can flexibly set the position of the heating pipe 2 according to actual usage requirements; therefore, no exhaustive list is provided here.

[0028] One end of the aforementioned water inlet pipe 3 is connected to the heating pipe 2, and the other end of the water inlet pipe 3 is connected to the water supply pipe 41 of the hot water system 4 of the thermal power plant. It is easy to understand that the water supply pipe 41 of the hot water system 4 of the thermal power plant here refers to the pipe that supplies water from the hot water system 4 to other water systems, rather than the pipe that supplies water from other water systems to the hot water system 4.

[0029] The aforementioned first booster pump 51 is installed in the water inlet pipe 3. This first booster pump 51 is used to pressurize the water from the water supply pipe 41 and deliver it to the aforementioned heating pipe 2. The first booster pump 51 is, for example, a vertical inline centrifugal pump (e.g., IRG series centrifugal pump, ISG series centrifugal pump, etc.); or a multi-stage variable frequency centrifugal pump (e.g., Grundfos CR series centrifugal pump, Wilo MHI series centrifugal pump, etc.). For example, the flow rate of the first booster pump 51 is 15 m³ / s. 3 The pump has a head of 30m and a power of 3kW. Those skilled in the art can make specific settings according to actual usage requirements; further details are omitted here.

[0030] One end of the outlet pipe 6 is connected to the end of the heating pipe 2 furthest from the inlet pipe 3, and the other end of the outlet pipe 6 is connected to the return water pipe 42 of the hot water system 4 of the thermal power plant. It is easy to understand that the return water pipe 42 here refers to the pipe through which the water, after heat exchange, flows back to the hot water system 4 of the thermal power plant. The temperature in the return water pipe 42 of the hot water system 4 of the thermal power plant is lower than the temperature in the supply water pipe 41.

[0031] For example, the temperature range within the water supply pipe 41 of the hot water system 4 is 120℃ to 130℃. For instance, the temperature within the water supply pipe 41 of the hot water system 4 is 120℃; or 122℃; or 125℃; or 127℃; or 130℃. The temperature range within the return pipe 42 of the hot water system 4 is 70℃ to 80℃. For example, the temperature in the return water pipe 42 of the hot water system 4 is 70°C; or the temperature in the return water pipe 42 of the hot water system 4 is 72°C; or the temperature in the return water pipe 42 of the hot water system 4 is 75°C; or the temperature in the return water pipe 42 of the hot water system 4 is 77°C; or the temperature in the return water pipe 42 of the hot water system 4 is 80°C.

[0032] One end of the bypass pipe 7 is connected to the heating pipe 2, and the other end of the bypass pipe 7 is connected to the return water pipe 42 of the hot water system 4. The monitoring module 8 is at least partially located inside the component to be heated 1, and is used to collect the internal status information of the component to be heated 1. The control module 9 is located in the bypass pipe 7. The control module 9 is coupled to the monitoring module 8, and this coupling includes electrical connection and signal connection. The control module 9 can control the opening and closing of the bypass pipe 7 based on the internal status information of the component to be heated 1 collected by the monitoring module 8.

[0033] Therefore, the denitrification reducing agent heating system provided in this embodiment includes a heating pipe 2 installed inside the component to be heated 1, and an inlet pipe 3 connected at one end to the heating pipe 2 and at the other end to the water supply pipe 41 of the hot water system 4 of the thermal power plant. A first booster pump 51 is installed on the inlet pipe 3 to pressurize the water from the water supply pipe 41 and deliver it to the heating pipe 2. An outlet pipe is installed at one end to the heating pipe 2 and at the other end to the return water pipe 42 of the hot water system 4 of the thermal power plant. A bypass pipe 7 is also installed at one end to the heating pipe 2 and at the other end to the return water pipe 42 of the hot water system 4. In addition, a monitoring module 8 is provided to collect the internal status information of the component to be heated 1. A control module 9 is installed on the bypass pipe 7, coupled to the monitoring module 8, and can control the opening and closing of the bypass pipe 7 according to the internal status information of the component to be heated 1 collected by the monitoring module 8. This allows for efficient heat exchange between the denitrification reducing agent and the heating component 1 when the denitrification reducing agent needs to be prepared. The reducing agent raw material is placed inside the component to be heated 1. High-temperature water from the supply pipe 41 of the power plant's hot water system 4 is then transported to the heating pipe 2 via the inlet pipe 3 and the first booster pump 51. As the hot water flows through the heating pipe 2, it exchanges heat with the interior of the component to be heated 1, thus heating the interior to meet the temperature requirements for reducing agent preparation. The cooled water, after heat exchange, returns to the return pipe 42 of the power plant's hot water system 4 via the outlet pipe 6, allowing it to reheat and form a complete heating cycle. During this process, no additional heating device is required. Utilizing the power plant's hot water system 4 as the heat source effectively avoids heat resource waste and reduces costs. Furthermore, the heating system has a simple structure, is easy to control, and is convenient to operate. Meanwhile, when the internal state of the component to be heated 1 is abnormal (such as excessive internal pressure or insufficient hot water supply leading to excessively low internal temperature), the monitoring module 8 and the control module 9 can be used to control the opening and closing of the bypass pipe 7, so as to keep the inside of the component to be heated 1 warm or depressurize in a timely manner. This facilitates the heat preservation operation of the component to be heated 1 and improves the safety of the reducing agent preparation process.

[0034] In some embodiments, the internal state information of the component to be heated 1 includes pressure information and temperature information. Further, the monitoring module 8 includes a pressure monitor 81 and a temperature monitor 82. The pressure monitor 81 is used to collect pressure information inside the heating component. This pressure monitor 81 is, for example, a piezoelectric crystal sensor or an absolute / gauge pressure sensor. The temperature monitor 82 is used to collect temperature information inside the heating component. This temperature monitor 82 is, for example, a thermocouple or a resistance temperature sensor. Those skilled in the art can flexibly select the appropriate sensor according to actual usage requirements, and further details are omitted here. This configuration enables the monitoring of both pressure and temperature inside the component to be heated 1, resulting in a simple structure and convenient component selection.

[0035] In some embodiments, the control module 9 includes a switching valve and a controller coupled to each other. The switching valve is, for example, an electric butterfly valve or an electric ball valve. The controller is an ARM microcontroller or a programmable logic controller. The switching valve is located in the bypass pipeline 7. The pressure monitor 81 and the temperature monitor 82 are respectively coupled to the controller. The controller can control the opening and closing state of the switching valve based on the pressure information inside the component 1 to be heated collected by the pressure monitor 81 and the temperature information inside the component 1 to be heated collected by the temperature monitor 82. Specifically, when the pressure information collected by the pressure monitor 81 inside the component to be heated 1 is higher than the preset pressure, it indicates that there is an overpressure risk inside the component to be heated 1. The controller controls the switch valve to open, so that the bypass pipe 7 is in the open state. The heating pipe 2 inside the component to be heated 1 can be connected to the return water pipe 42 of the hot water system 4 through the bypass pipe 7. At this time, since the temperature in the heating pipe 2 is higher than the temperature in the return water pipe 42, the two exchange heat, which can reduce the temperature in the heating pipe 2, thereby reducing the internal temperature of the component to be heated 1 and indirectly reducing the internal pressure of the component to be heated 1. When the pressure information collected by the pressure monitor 81 inside the component to be heated 1 is lower than or equal to the preset pressure, the controller controls the switch valve to close, so that the bypass pipe 7 is in the disconnected state. When the temperature information collected by the temperature monitor 82 is lower than the preset temperature inside the component to be heated 1, it indicates that the hot water supply from the inlet pipe 3 has stopped (for example, the first booster pump 51 has malfunctioned and cannot deliver hot water), causing the internal temperature of the component to be heated 1 to drop. At this time, the controller controls the switch valve to open, so that the bypass pipe 7 is in a closed state. The heating pipe 2 inside the component to be heated 1 can exchange heat with the water in the return water pipe 42 of the hot water system 4 through the bypass pipe 7. Since the temperature in the heating pipe 2 is lower than the temperature in the return water pipe 42, the heat exchange can raise the temperature in the heating pipe 2, thereby increasing the internal temperature of the component to be heated 1 and keeping the inside of the component to be heated 1 warm. Through the above settings, the pressure relief or heat preservation of the inside of the component to be heated 1 can be achieved. The structure and principle are simple and easy to use.

[0036] In some embodiments, such as Figure 1 As shown, the aforementioned denitrification reducing agent heating system also includes a second booster pump 52. This second booster pump 52 is located in the inlet water pipe 3 and is connected in parallel with the first booster pump 51. This arrangement provides a backup booster pump for the inlet water pipe, ensuring that if the first booster pump 51 fails, the hot water from the power plant's hot water system 4's supply pipe 41 can still be normally delivered to the heating pipe 2 through the inlet water pipe, thus improving the reliability of the aforementioned denitrification reducing agent heating system during use.

[0037] In some embodiments, the above-described denitrification reducing agent heating system further includes a third booster pump. This third booster pump is located in the outlet pipe 6 and is used to pressurize the water from the heating pipe 2 and deliver it to the return water pipe 42 of the hot water system 4. This arrangement facilitates the timely delivery of the heat-exchanged water in the heating pipe 2 to the return water pipe 42 of the hot water system 4, thus facilitating the heating cycle of the entire heating system.

[0038] In some embodiments, the heating pipe 2 has a spiral structure. This arrangement maximizes the heat exchange area between the heating pipe 2 and the component to be heated 1, allowing the hot water from the inlet pipe 3 in the heating pipe 2 to fully exchange heat with the interior of the component to be heated 1, thereby improving the heating effect on the interior of the component to be heated 1.

[0039] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A de-NOx reductant heating system, comprising: include: The component to be heated (1) has a heating pipe (2) inside. The water inlet pipe (3) is connected at one end to the heating pipe (2) and at the other end to the water supply pipe (41) of the hot water system (4) of the thermal power plant; The first booster pump (51) is installed in the water inlet pipe (3) to boost the water from the water supply pipe (41) and deliver it to the heating pipe (2). The outlet pipe (6) is connected at one end to the end of the heating pipe (2) away from the inlet pipe (3), and at the other end to the return water pipe (42) of the hot water system (4) of the thermal power plant; the temperature in the return water pipe (42) is lower than the temperature in the supply water pipe (41); The bypass pipe (7) is connected at one end to the heating pipe (2) and at the other end to the return water pipe (42) of the hot water system (4); The monitoring module (8) is at least partially disposed inside the component to be heated (1) and is used to collect the status information inside the component to be heated (1); A control module (9) is installed in the bypass pipe (7); the control module (9) is coupled to the monitoring module (8) and can control the opening and closing of the bypass pipe (7) according to the status information inside the component to be heated (1) collected by the monitoring module (8).

2. The denitrification reducing agent heating system according to claim 1, characterized in that, The internal status information of the heating component includes pressure information and temperature information.

3. The denitrification reducing agent heating system according to claim 2, characterized in that, The monitoring module (8) includes a pressure monitor (81) and a temperature monitor (82); the pressure monitor (81) is used to collect the pressure information inside the heating component; the temperature monitor (82) is used to collect the temperature information inside the heating component.

4. The denitrification reducing agent heating system according to claim 3, characterized in that, The control module (9) includes a switching valve and a controller that are coupled to each other; The switching valve is located in the bypass pipeline (7); the pressure monitor (81) and the temperature monitor (82) are respectively coupled to the controller; the controller can control the opening and closing state of the switching valve according to the pressure information inside the component to be heated (1) collected by the pressure monitor (81) and the temperature information inside the component to be heated (1) collected by the temperature monitor (82).

5. The denitrification reducing agent heating system according to claim 4, characterized in that, The controller is an ARM microcontroller or a programmable logic controller.

6. The denitrification reducing agent heating system according to claim 1, characterized in that, It also includes a second booster pump (52), which is installed in the water inlet pipe (3) and is connected in parallel with the first booster pump (51).

7. The denitrification reducing agent heating system according to claim 1, characterized in that, It also includes a third booster pump, which is installed in the outlet pipe (6) to pressurize the water from the heating pipe (2) and deliver it to the return pipe (42) of the hot water system (4).

8. The denitrification reducing agent heating system according to claim 1, characterized in that, The heating pipe (2) has a spiral structure.

9. The denitrification reducing agent heating system according to any one of claims 1 to 8, characterized in that, The temperature range within the water supply pipe (41) of the hot water system (4) is 120℃~130℃.

10. The denitrification reducing agent heating system according to any one of claims 1 to 8, characterized in that, The temperature range in the return water pipe (42) of the hot water system (4) is 70℃~80℃.

Images