Boiler room system with indirect cooling function and method

Abstract

The invention discloses a boiler room system with an indirect cooling function and a control method of the boiler room system with the indirect cooling function, and the boiler room system comprises a closed boiler room which is internally provided with a boiler device; the cooling triangles are arranged on the periphery of the bottom of the closed boiler room, and the cooling triangles are provided with shutters; the air outlet is formed in the top of the closed boiler room, and the air outlet is provided with a shutter; the boiler room cooling system comprises a water inlet pipeline and a water return pipeline which are connected with the cooling triangle; the water inlet valve is arranged on the water inlet pipeline; the water inlet regulating valve is arranged on the water inlet pipeline and is positioned at the downstream of the water inlet valve; the water return valve is arranged on the water return pipeline; circulating cooling water is led out of a condenser outlet water pipeline through the water inlet pipeline and enters the cooling triangle, the cooled circulating cooling water is returned to a circulating water pump inlet pipeline through the water return pipeline, and therefore the thermal power generating unit can be cooled.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of boiler room energy saving technology, in particular to a boiler room system with indirect cooling function and a control method of the boiler room system with indirect cooling function. BACKGROUND

[0002] Indirect air cooling technology is an important circulating water cooling method in the field of thermal power generation. The indirect air cooling tower realizes fluid cooling through air convection. The working principle is that the high-temperature circulating water enters the tower and exchanges heat with cold air through the vertically arranged cooling triangle. The cold air is sucked into the tower from the bottom by the negative pressure of hot air formed by the tall hyperbolic tower, absorbs the heat of the circulating water in the pipe when flowing through the gap of the cooling triangle fins, and returns to the condenser for circulation after the water temperature is reduced. The system avoids direct contact between air and process fluid through indirect heat exchange, has the characteristics of water saving and stable operation, and is widely used in circulating water cooling in fields such as thermal power plants and chemical industry.

[0003] In the related art, the cooling effect of the indirect cooling tower is significantly affected by the ambient temperature. During the summer high-temperature period, the cooling capacity is insufficient, resulting in a high temperature of the cooled circulating water, which in turn affects the vacuum degree of the unit, so that the unit has to run at a reduced load. And in order to meet the cooling demand in summer, the heat exchange area needs to be increased, which leads to an increase in the size and height of the indirect cooling tower, and a significant increase in construction cost. Under normal circumstances, the indirect cooling tower is designed according to the temperature in spring and autumn, sacrificing the full-load operation capacity of the unit during the summer high-temperature period. However, summer is the period of highest electricity demand, and this design limits the power generation capacity of the unit during the peak electricity demand period.

[0004] Therefore, how to effectively increase the heat exchange capacity of the indirect cooling system without significantly increasing the size and investment of the cooling tower, to solve the problem of insufficient load capacity of the unit due to limited vacuum during the summer high-temperature period, to realize full-load operation of the unit during the summer high-temperature period, and to reduce the circulating water temperature of the unit throughout the year, thereby reducing the back pressure and coal consumption of the unit, is the focus of attention for those skilled in the art. SUMMARY

[0005] In order to solve the problems in the prior art, the present application provides a boiler room system with indirect cooling function and a control method of the boiler room system with indirect cooling function. The device effectively increases the heat exchange capacity of the indirect cooling system without significantly increasing the size and investment of the cooling tower, to solve the problem of insufficient load capacity of the unit due to limited vacuum during the summer high-temperature period, to realize full-load operation of the unit during the summer high-temperature period.

[0006] In order to achieve the purpose of the present application, the following technical scheme is adopted: a boiler room system with indirect cooling function, comprising: a closed boiler room, which is internally provided with a boiler device; cooling triangles are arranged around the bottom of the closed boiler room, and the cooling triangles are provided with louvers; air outlets are arranged on the top of the closed boiler room, and the air outlets are provided with louvers; a boiler room cooling system, comprising a water inlet pipeline and a water return pipeline connected with the cooling triangles; a water inlet valve arranged on the water inlet pipeline; a water inlet adjusting valve arranged on the water inlet pipeline and located downstream of the water inlet valve; a water return valve arranged on the water return pipeline; The water inlet pipeline draws circulating cooling water from the condenser outlet water pipeline into the cooling triangles, and the water return pipeline returns the cooled circulating cooling water to the circulating water pump inlet pipeline, so as to cool the thermal power generating unit.

[0007] Optionally, the cooling triangles are composed of two groups of multi-pipe radiators with fins.

[0008] Optionally, the bottom of the closed boiler room is provided with a temperature measuring point, and the top of the closed boiler room is provided with a temperature measuring point.

[0009] Optionally, the bottom of the closed boiler room is further provided with a pressure measuring point.

[0010] Optionally, the water inlet pipeline is provided with a water inlet temperature measuring point, and the water return pipeline is provided with a water return temperature measuring point.

[0011] Optionally, the boiler room cooling system further comprises a collecting pipeline, which collects the pipelines of all the cooling triangles and is connected with the water inlet pipeline and the water return pipeline.

[0012] Optionally, the boiler device is at least one of a coal-fired boiler, a gas-fired boiler or an oil-fired boiler.

[0013] Optionally, the louvers on the cooling triangles and the louvers on the air outlets are adjustable louvers.

[0014] Optionally, the height of the closed boiler room is more than 80 meters.

[0015] Optionally, the water inlet pipeline is connected in parallel with the circulating water system of the indirect cooling tower, and the water return pipeline is connected with the inlet pipeline of the circulating water pump.

[0016] The application also provides a control method of a boiler room system with an indirect cooling function, comprising: starting the circulating water pump to establish water circulation of the circulating water system; When the circulating cooling water temperature is greater than or equal to the temperature to be cooled, water is injected into the cooling triangle to exhaust air; The water inlet valve and the backwater valve are opened; The water inlet regulating valve is opened to allow circulating cooling water to enter the cooling triangle; The opening degree of the water inlet regulating valve is adjusted according to the water inlet temperature on the water inlet pipeline and the backwater temperature on the backwater pipeline.

[0017] Compared with the prior art, the present application has the following beneficial effects: By setting cooling triangles around the bottom of the closed boiler room, cooperating with the water inlet pipeline and the backwater pipeline to form a boiler room cooling system, and utilizing the heat emitted during boiler operation to increase the internal temperature of the boiler room, a stable pressure difference is formed between the inside and outside of the closed boiler room, which drives cold air to continuously enter from the bottom cooling triangle, flow upwards after absorbing the heat of the circulating cooling water, and be discharged from the top air outlet, forming a natural convection circulation. This design effectively increases the heat exchange area and capacity of the cooling system without increasing the size of the indirect cooling tower, solving the problem that the unit cannot run at full load due to limited vacuum caused by insufficient cooling capacity during the summer high temperature period. At the same time, the system can be operated throughout the year to reduce the circulating cooling water temperature, thereby reducing the unit back pressure and exhaust steam temperature, improving the unit operation efficiency, and reducing the coal consumption for power generation. In addition, the system also accelerates the air flow inside the boiler room, reduces the ambient temperature at the top of the boiler room, improves the reliability of equipment operation, and has relatively low investment cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall structure schematic diagram of a boiler room system with indirect cooling function provided by the embodiment of the present application; Figure 2 The indirect cooling water system schematic diagram of a boiler room system with indirect cooling function provided by the embodiment of the present application.

[0019] In the figure: closed boiler room-1, boiler device-2, cooling triangle-3, louver-4, air outlet-5, boiler room top temperature measuring point-6, boiler room bottom pressure measuring point-7, boiler room bottom temperature measuring point-8, condenser-9, boiler room cooling system-10, indirect cooling tower cooling triangle-11, circulating water pump-12, water inlet valve-13, water inlet regulating valve-14, backwater valve-15, water inlet temperature measuring point-16, backwater temperature measuring point-17. DETAILED DESCRIPTION

[0020] To address the problems existing in the prior art, this invention provides a boiler room system with indirect cooling function and a control method for the boiler room system with indirect cooling function. This device effectively increases the heat exchange capacity of the indirect cooling system without significantly increasing the size of the cooling tower and investment, so as to solve the problem of insufficient load-bearing capacity of the unit due to vacuum limitation during the high-temperature period in summer, and realize the full-load operation of the unit during the high-temperature period in summer.

[0021] The technical solutions of the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings: Please refer to Figure 1 , Figure 1 This is a schematic diagram of the overall structure of a boiler room system with indirect cooling function provided in an embodiment of this application.

[0022] Please refer to Figure 2 , Figure 2 This is a schematic diagram of an indirect cooling water system for a boiler room system with indirect cooling function, provided as an embodiment of this application.

[0023] In this embodiment, a boiler room system with indirect cooling function is provided, including a closed boiler room 1 and a boiler room cooling system 10.

[0024] The enclosed boiler room 1 is a fully enclosed structure with a height of 100 meters, and houses a coal-fired boiler unit 2. Cooling triangles 3 are arranged around the bottom of the enclosed boiler room 1, each consisting of two sets of multi-tube radiators with fins, and adjustable louvers 4 are installed on the exterior. An air outlet 5 is located at the top of the enclosed boiler room 1, with sufficient airflow area and adjustable louvers to regulate airflow.

[0025] Temperature measuring point 8 is installed at the bottom of the enclosed boiler room 1 to detect the ambient temperature at the bottom of the boiler room. Temperature measuring point 6 is installed at the top of the enclosed boiler room 1 to detect the ambient temperature at the top of the boiler room. Pressure measuring point 7 is also installed at the bottom of the enclosed boiler room 1 to detect the pressure inside the boiler room.

[0026] The boiler room cooling system 10 includes an inlet water pipe and a return water pipe. The inlet water pipe leads from the outlet water pipe of the condenser 9, passes through the inlet water valve 13 and the inlet water regulating valve 14 in sequence, and then connects to the cooling triangle 3. The return water pipe leads from the cooling triangle 3, passes through the return water valve 15, and then flows into the inlet pipe of the circulating water pump 12. An inlet water temperature measuring point 16 is installed on the inlet water pipe, and a return water temperature measuring point 17 is installed on the return water pipe.

[0027] The boiler room cooling system 10 also includes a collection pipe, which gathers the pipes of all cooling triangles 3 and connects them to the inlet and return water pipes to form a unified inlet and return water system.

[0028] The operation control method of this embodiment may include: When the thermal power unit is running, the circulating cooling water is heated by heat exchange in the condenser 9. Part of it is sent to the cooling triangle 11 of the indirect cooling tower for cooling, while the other part of the circulating cooling water is drawn from the outlet water pipe of the condenser 9, passes through the inlet valve 13 and the inlet regulating valve 14, and enters the cooling triangle 3 of the boiler room. In the cooling triangle 3, the circulating cooling water exchanges heat with the air. After the temperature decreases, it returns to the inlet pipe of the circulating water pump 12 through the return water valve 15, and is then sent back to the condenser 9 for recycling.

[0029] As boiler unit 2 emits heat during operation, the temperature inside the enclosed boiler room 1 rises, the air density decreases, and a pressure difference is created between the air inside and outside. Driven by this pressure difference, cold air enters from the cooling triangle 3 at the bottom of the boiler room. As it flows through the gaps between the fins of the cooling triangle 3, it absorbs heat from the circulating cooling water, its temperature rises, and it flows upward, eventually being discharged from the top air outlet 5. This natural convection process continues, constantly introducing cold air into the bottom of the boiler room, achieving continuous cooling of the circulating cooling water.

[0030] By adjusting the opening of the inlet regulating valve 14, the flow rate of circulating cooling water entering the cooling triangle 3 can be controlled, thereby adjusting the cooling effect. By adjusting the opening of the louvers on the cooling triangle 3 and the air outlet 5, the air flow can be controlled, optimizing heat exchange efficiency. The monitoring data from temperature measuring points 6 and 8 and pressure measuring point 7 allows for real-time monitoring of the boiler room's operating status, facilitating adjustments and control by operators.

[0031] In this embodiment, the boiler room cooling system 10 operates in parallel with the circulating water system of the indirect cooling tower. During the high-temperature period in summer, it can significantly increase the cooling capacity, preventing the unit from operating at reduced load due to vacuum limitations and enabling the unit to operate at full load. At the same time, the system can reduce the temperature of the circulating cooling water throughout the year, thereby reducing the unit back pressure and exhaust steam temperature, improving unit efficiency, and reducing coal consumption for power generation.

[0032] Furthermore, this application also provides another specific embodiment to further illustrate a boiler room system with indirect cooling function provided in this application.

[0033] This embodiment provides another boiler room system with indirect cooling function, the main difference from the first embodiment lies in the boiler type and system configuration.

[0034] The enclosed boiler room is 85 meters high and houses a gas-fired boiler. The cooling triangle consists of three sets of multi-tube radiators with fins to increase the heat exchange area.

[0035] The boiler room cooling system in this embodiment adopts a zoned control method. The cooling triangle around the bottom of the enclosed boiler room is divided into four zones: east, south, west, and north. Each zone's cooling triangle is connected to the inlet and return water pipes through its own collection pipes. Each zone's inlet water pipe is equipped with an independent inlet valve and an inlet water regulating valve, and the return water pipe is equipped with an independent return water valve, thereby achieving independent zoned control.

[0036] Inlet and return water temperature measuring points are installed on the inlet and return water pipes of each area to accurately monitor the cooling effect of each area. Temperature and pressure measuring points are installed in four areas at the bottom of the enclosed boiler room to comprehensively understand the temperature and pressure field distribution inside the boiler room.

[0037] The zoned control method in this embodiment can flexibly adjust the water inlet flow and louver opening of the cooling triangle in each zone according to the temperature and pressure conditions of different zones, achieving more precise cooling control. When the ambient wind speed is high, the louvers in the windward area can be closed appropriately, and the louver opening in the leeward area can be reduced to avoid cross drafts, ensure airflow uniformity, and improve the overall heat exchange effect.

[0038] Furthermore, this application also provides another specific embodiment to further illustrate a boiler room system with indirect cooling function provided in this application.

[0039] This embodiment provides an operation mode for a boiler room system with indirect cooling function, using the system structure described in Embodiment 1.

[0040] Before starting the unit, first start the circulating water pump 12 to establish water circulation in the circulating water system. When the temperature of the circulating cooling water rises to the temperature that needs to be cooled, fill the boiler room cooling triangle 3 with water and vent it according to the conventional method of the indirect cooling system to ensure that the cooling triangle 3 is full of water and free of gas.

[0041] After water filling is complete, open the inlet valve 13 and the return valve 15, and then gradually open the inlet regulating valve 14 to allow the circulating cooling water to slowly enter the cooling triangle 3. Based on the temperature data displayed at the inlet temperature measuring point 16 and the return temperature measuring point 17, adjust the opening of the inlet regulating valve 14 to keep the temperature difference between the inlet and outlet water within a reasonable range, generally controlled at 5-10℃.

[0042] During normal operation, the temperature at the top and bottom of the boiler room is monitored through temperature measuring points 6 and 8. When the temperature at the bottom of the boiler room is too low, the opening of the louvers on the cooling triangle 3 can be reduced to decrease the amount of cold air entering, while the opening of the inlet water regulating valve 14 can be increased to increase the flow rate of circulating cooling water. The heat from the circulating cooling water can then be used to raise the temperature of the boiler room, preventing equipment malfunctions due to low temperatures.

[0043] When the unit vacuum is too low, the operation of some of the indirect cooling tower cooling triangle 11 can be shut down, and priority should be given to ensuring the operation of the boiler room cooling triangle 3, because the boiler room cooling system uses the natural ventilation power provided by the boiler heat dissipation, and the operating cost is relatively low.

[0044] When the ambient temperature is high and maximum cooling capacity is required, the louvers on the cooling triangle 3 and the air outlet 5 can be fully opened, the water inlet regulating valve 14 can be adjusted to the maximum opening, and at the same time, the cooling triangle 11 of the indirect cooling tower can also be fully put into operation to achieve maximum cooling capacity.

[0045] When the unit is shut down or the boiler room cooling system is not required, first close the inlet water regulating valve 14 to reduce the inlet water flow, then close the inlet water valve 13 and the return water valve 15 in sequence to shut down the system. During severe cold seasons or long-term shutdowns, the water stored inside the cooling triangle 3 can be drained through the drain valve to prevent the pipes from freezing and cracking.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A boiler room system with indirect cooling function, characterized in that, include: An enclosed boiler room, which contains boiler equipment; A cooling triangle is installed around the bottom of the enclosed boiler room, and the cooling triangle is equipped with louvers; the cooling triangle is used to achieve the cooling function. An air outlet is located at the top of the enclosed boiler room, and the air outlet is equipped with louvers. The boiler room cooling system includes an inlet water pipe and a return water pipe connected to the cooling triangle; The inlet valve is installed on the inlet pipe; An inlet regulating valve is installed on the inlet pipeline and located downstream of the inlet valve; A return water valve is installed on the return water pipeline; The water inlet pipe leads circulating cooling water from the condenser outlet water pipe into the cooling triangle, and the return water pipe returns the cooled circulating cooling water to the circulating water pump inlet pipe to achieve cooling of the thermal power unit.

2. The boiler room system according to claim 1, characterized in that, The cooling triangle consists of two sets of multi-tube radiators with fins.

3. The boiler room system according to claim 2, characterized in that, Temperature measuring points are installed at the bottom and at the top of the enclosed boiler room.

4. The boiler room system according to claim 3, characterized in that, Pressure measuring points are also installed at the bottom of the enclosed boiler room.

5. The boiler room system according to claim 4, characterized in that, The inlet water pipe is equipped with an inlet water temperature measuring point, and the return water pipe is equipped with a return water temperature measuring point.

6. The boiler room system according to claim 5, characterized in that, The boiler room cooling system also includes a collection pipe, which gathers all the pipes of the cooling triangle and connects them to the inlet pipe and the return pipe.

7. The boiler room system according to claim 6, characterized in that, The boiler unit is at least one of a coal-fired boiler, a gas-fired boiler, or an oil-fired boiler.

8. The boiler room system according to claim 7, characterized in that, Both the louvers on the cooling triangle and the louvers on the air outlet are adjustable louvers.

9. The boiler room system according to claim 8, characterized in that, The inlet water pipe is connected in parallel with the circulating water system of the indirect cooling tower, and the return water pipe flows into the inlet pipe of the circulating water pump.

10. A control method for a boiler room system with indirect cooling function, based on the boiler room system described in claims 1 to 9, characterized in that, include: Start the circulating water pump to establish water circulation in the circulating water system; When the temperature of the circulating cooling water is greater than or equal to the temperature to be cooled, water should be injected and air should be vented from the cooling triangle. Open the inlet and outlet valves; Open the inlet regulating valve to allow circulating cooling water to enter the cooling triangle; The opening of the inlet regulating valve is adjusted according to the inlet water temperature on the inlet pipe and the return water temperature on the return water pipe.

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