Debugging energy-saving system for thermal power plant

Abstract

The utility model provides a debugging energy-saving system of a thermal power plant, which belongs to the technical field of debugging equipment of the thermal power plant, and is characterized in that a first bypass pipe is connected in parallel with two ends of a circulating water pump, a second bypass pipe is connected in parallel with two ends of an auxiliary machine water pump, and a debugging water pump is arranged on the first bypass pipe or the second bypass pipe; in the debugging period of the auxiliary machine equipment set, the circulating water pump and the auxiliary machine water pump can be stopped, the debugging water pump on the first bypass pipe or the second bypass pipe is started, and the first bypass pipe, the second bypass pipe and the debugging water pump are communicated to replace an original circulating water system for operation, so that the power consumption of the original circulating water system can be greatly reduced; and a remarkable energy-saving effect is achieved. On the premise of ensuring safe, stable and efficient debugging of equipment of the unit and stable supply of cooling water of the equipment, operation of the circulating water pump is reduced, power consumption of the circulating water pump during debugging of the unit is effectively reduced, and remarkable economic benefits are achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of thermal power plant commissioning equipment, and more specifically, it relates to a thermal power plant commissioning energy-saving system. Background Technology

[0002] With rapid economic development and increasing energy demand, the construction of thermal power plants has accelerated, placing higher demands on energy conservation and consumption reduction during the construction and commissioning of thermal power plant units, in order to minimize the consumption of resources such as water, electricity, steam, and oil.

[0003] During the commissioning and trial operation of thermal power units, the adjustments to systems and equipment are complex, involving highly coupled, coordinated, and automated systems. The precision and accuracy of the trial operation directly impact the performance and economic indicators of the thermal power unit. Therefore, it is of profound significance to fully explore the energy-saving potential of large thermal power units during commissioning, optimize system operation, adjust systems to optimal parameters, and minimize plant power consumption, turbine heat consumption, auxiliary equipment energy consumption, and improve boiler and generator efficiency.

[0004] Currently, taking a 2×1000MW (million kilowatt-hour) thermal power unit as an example, the electricity consumption during the commissioning and trial operation of the unit reaches 50 million kWh. Calculated at an average electricity price of 0.6 yuan / kWh, the electricity cost during the commissioning period is as high as 30 million yuan. Among them, the circulating water pump, due to its high equipment power and long operating time, has become the biggest electricity consumer during the commissioning period. A 2×1000MW thermal power unit is generally equipped with 2×3 circulating water pumps, each with a motor power of 3500 kW. As the core of the cooling water for all equipment in the unit, as long as any equipment needs to use circulating water for cooling during the commissioning period, regardless of the amount of circulating water, at least one circulating water pump must be put into operation, which will cause a huge waste.

[0005] Minimizing the operation of circulating water pumps during unit commissioning has become a key factor in energy conservation during the commissioning of thermal power plant units. Utility Model Content

[0006] The purpose of this utility model is to provide an energy-saving system for the commissioning of thermal power plants, which reduces the operation of circulating water pumps while ensuring the safe, stable and efficient commissioning of all equipment in the unit and ensuring a stable supply of cooling water to the equipment. This effectively reduces the power consumption of circulating water pumps during the commissioning of the unit and overcomes the shortcomings of high power consumption of circulating water pumps in existing thermal power units during commissioning.

[0007] To achieve the above objectives, this utility model provides an energy-saving commissioning system for thermal power plants, comprising:

[0008] Cooling tower;

[0009] The cooling tower outlet channel is connected at one end to the outlet end of the cooling tower pool.

[0010] A circulating water inlet pipe is connected at one end to the other end of the cooling tower outlet channel; a circulating water pump and a condenser are connected in sequence on the circulating water inlet pipe.

[0011] The circulating water outlet pipe has one end connected to the other end of the circulating water inlet pipe, and the other end connected to the inlet end of the central water distribution shaft of the cooling tower.

[0012] The auxiliary machine cooling water inlet pipe has one end connected to the circulating water inlet pipe between the circulating water pump and the condenser, and the other end connected to one end of the auxiliary machine cooling water outlet pipe; the other end of the auxiliary machine cooling water outlet pipe is connected to the circulating water outlet pipe; the auxiliary machine cooling water inlet pipe is sequentially connected to an auxiliary machine water pump and an auxiliary machine equipment group; the auxiliary machine equipment group includes multiple auxiliary machine equipment connected in parallel;

[0013] The first bypass pipe is connected in parallel to both ends of the circulating water pump;

[0014] A second bypass pipe is connected in parallel to both ends of the auxiliary water pump; and,

[0015] Debug the water pump, which is connected to the first bypass pipe or the second bypass pipe.

[0016] Furthermore, the outlet of the circulating water pump is connected to a circulating water pump outlet hydraulic control valve.

[0017] Furthermore, the condenser inlet and outlet are respectively connected to a condenser inlet valve and a condenser outlet valve.

[0018] Furthermore, the inlet and outlet of the auxiliary water pump are respectively connected to an auxiliary water pump inlet valve and an auxiliary water pump outlet valve.

[0019] Furthermore, the circulating water pump outlet hydraulic control valve, the condenser inlet valve, the condenser outlet valve, the auxiliary machine water pump inlet valve, and the auxiliary machine water pump outlet valve are all butterfly valves.

[0020] Furthermore, the test pump is a self-priming pump, and the test pump is installed in the outlet channel of the cooling tower.

[0021] Furthermore, the flow rate of the test pump meets the sum of the cooling water volume of the auxiliary equipment that starts simultaneously in the auxiliary equipment group, and the head of the test pump meets the sum of the dynamic head and static head of the circulating water system during the test period.

[0022] Furthermore, the first bypass pipe and the second bypass pipe have the same diameter.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] This utility model discloses an energy-saving commissioning system for thermal power plants. By connecting a first bypass pipe in parallel to both ends of the circulating water pump and a second bypass pipe in parallel to both ends of the auxiliary equipment pump, and installing a commissioning pump on either the first or second bypass pipe, the circulating water pump and auxiliary equipment pumps can be shut down during the commissioning period of the auxiliary equipment group. Only the commissioning pump on the first or second bypass pipe is started, and the original circulating water system is replaced by the connection of the first and second bypass pipes and the commissioning pump. This significantly reduces the power consumption of the original circulating water system, resulting in a significant energy-saving effect. This energy-saving commissioning system for thermal power plants can reduce the operation of circulating water pumps while ensuring safe, stable, and efficient commissioning of all equipment and a stable supply of cooling water, effectively reducing the power consumption of circulating water pumps during unit commissioning and demonstrating significant economic benefits. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the circulating water system of a thermal power plant commissioning system provided for the present invention;

[0027] Figure 2 A schematic diagram of the structure of a thermal power plant commissioning and energy-saving system provided in this embodiment of the present invention;

[0028] Figure 3 for Figure 2 Enlarged structural diagram of the auxiliary equipment group.

[0029] The following are the labeling elements in the figure:

[0030] 1. Cooling tower; 2. Cooling tower outlet channel; 3. Circulating water pump; 4. Circulating water inlet pipe; 5. Condenser; 6. Circulating water outlet pipe; 7. Auxiliary machine cooling water inlet pipe; 8. Auxiliary machine water pump; 9. Auxiliary equipment group; 10. Auxiliary machine cooling water outlet pipe; 11. Commissioning water pump; 12. First bypass pipe; 13. Second bypass pipe; 31. Circulating water pump outlet hydraulic control valve; 51. Condenser inlet valve; 52. Condenser outlet valve; 81. Auxiliary machine water pump inlet valve; 82. Auxiliary machine water pump outlet valve; 91-9N. Auxiliary equipment. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The singular forms “a,” “the,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0034] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. For example, without departing from the scope of the embodiments of this utility model, a first XX can also be referred to as a second XX, and similarly, a second XX can also be referred to as a first XX. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0035] In the prior art, the structural diagram of the circulating water system of a thermal power plant commissioning system is as follows: Figure 1 As shown, during the commissioning of the unit, the flow of the circulating water system is usually as follows: Cooling tower 1 (outlet end: tower pool) → Cooling tower outlet channel 2 → Circulating water pump 3 → Circulating water pump outlet hydraulic control valve 31 → Circulating water inlet pipe 4 → Condenser inlet valve 51 → Condenser 5 → Condenser outlet valve 52 (Auxiliary machine cooling water inlet pipe 7 → Auxiliary machine water pump inlet valve 81 → Auxiliary machine water pump 8 → Auxiliary machine water pump outlet valve 82 → Auxiliary machine equipment group 9 → Auxiliary machine cooling water outlet pipe 10) → Circulating water outlet pipe 6 → Cooling tower 1 (inlet end: central water distribution shaft).

[0036] exist Figure 1In the circulating water system, circulating water pump 3 serves as the power source for the circulating water process. Its flow rate should meet the combined circulating water volume of condenser 5 and auxiliary equipment group 9, and its head should ensure that it overcomes all system resistances and delivers the circulating water to the top of the central water distribution shaft of cooling tower 1. During unit operation, over 95% of the water volume is used to cool condenser 5, while the total water consumption of all equipment in auxiliary equipment group 9 is less than 5%, with each auxiliary equipment having a cooling water volume of approximately 5000 t / h. During the individual equipment commissioning phase, the main condenser 5 is not yet operational and does not require circulating cooling water. However, each auxiliary equipment requires the operation of circulating water pump 3 and auxiliary pump 8 during individual commissioning to ensure that the equipment receives circulating cooling water. Thus, operating circulating water pump 3 and auxiliary pump 8 during the individual commissioning of auxiliary equipment group 9 results in significant waste.

[0037] Based on this, the present invention improves the circulating water system of the existing thermal power plant commissioning system, and proposes an energy-saving commissioning system for thermal power plants. The improved system structure is as follows: Figure 2 , Figure 3 As shown.

[0038] Please see Figure 2 , Figure 3 The present invention will now describe an energy-saving commissioning system for thermal power plants provided by an embodiment of the present invention.

[0039] In one embodiment of this utility model, a power plant commissioning energy-saving system includes: a cooling tower 1, a cooling tower outlet channel 2, a circulating water pump 3, a circulating water inlet pipe 4, a condenser 5, a circulating water outlet pipe 6, an auxiliary machine cooling water inlet pipe 7, an auxiliary machine water pump 8, an auxiliary machine equipment group 9, an auxiliary machine cooling water outlet pipe 10, a commissioning water pump 11, a first bypass pipe 12, and a second bypass pipe 13. One end of the cooling tower outlet channel 2 is connected to the tower pool outlet end of the cooling tower 1; one end of the circulating water inlet pipe 4 is connected to the other end of the cooling tower outlet channel 2; the circulating water pump 3 and the condenser 5 are connected sequentially to the circulating water inlet pipe 4; one end of the circulating water outlet pipe 6 is connected to the other end of the circulating water inlet pipe 4, and the other end of the circulating water outlet pipe 6 is connected to the inlet end of the central water distribution shaft of the cooling tower 1. One end of the auxiliary cooling water inlet pipe 7 is connected to the circulating water inlet pipe 4 between the circulating water pump 3 and the condenser 5, and the other end is connected to one end of the auxiliary cooling water outlet pipe 10; the other end of the auxiliary cooling water outlet pipe 10 is connected to the circulating water outlet pipe 6; the auxiliary water pump 8 and the auxiliary equipment group 9 are connected in sequence on the auxiliary cooling water inlet pipe 7; the auxiliary equipment group 9 includes multiple auxiliary equipment connected in parallel: 91 to 9N. The first bypass pipe 12 is connected in parallel to both ends of the circulating water pump 3; the second bypass pipe 13 is connected in parallel to both ends of the auxiliary water pump 8; the test pump 11 can be connected to the first bypass pipe 12 or the second bypass pipe 13. Specifically, the location of the test pump 11 is related to the type of the circulating water pump 3. When the circulating water pump 3 is a horizontal centrifugal pump, the test pump 11 can be located at any position on the pipeline system connected to the first bypass pipe 12 and the second bypass pipe 13. Preferably, without changing the original layout of the circulating water system, the commissioning pump 11 can be connected to either the first bypass pipe 12 or the second bypass pipe 13; when the circulating water pump 3 is a vertical mixed flow pump, the commissioning pump 11 needs to be installed in the cooling tower outlet channel 2 to draw the cooling water in the cooling tower outlet channel 2 into the circulating water inlet pipe 4. Figure 2 In the power plant commissioning energy-saving system on display, the commissioning water pump 11 is connected to the first bypass pipe 12.

[0040] This embodiment of a thermal power plant commissioning energy-saving system involves connecting a first bypass pipe 12 in parallel across the two ends of the circulating water pump 3 and a second bypass pipe 13 in parallel across the two ends of the auxiliary machine pump 8. A commissioning pump 11 is installed on either the first or second bypass pipe 12. During the commissioning period of the auxiliary equipment group 9, the circulating water pump 3 and the auxiliary machine pump 8 can be shut down, and only the commissioning pump 11 on the first or second bypass pipe 12 can be started. By connecting the first bypass pipe 12, the second bypass pipe 13, and the commissioning pump 11 to replace the original circulating water system, the power consumption of the original circulating water system can be significantly reduced, resulting in significant energy savings. This thermal power plant commissioning energy-saving system, while ensuring the safe, stable, and efficient commissioning of all unit equipment and a stable supply of cooling water, reduces the operation of the circulating water pump 3, effectively lowering the power consumption of the circulating water pump during unit commissioning, and demonstrating significant economic benefits.

[0041] In this embodiment, the outlet of the circulating water pump 3 is connected to a circulating water pump outlet hydraulic control valve 31. The inlet and outlet of the condenser 5 are respectively connected to a condenser inlet valve 51 and a condenser outlet valve 52. The inlet and outlet of the auxiliary water pump 8 are respectively connected to an auxiliary water pump inlet valve 81 and an auxiliary water pump outlet valve 82. By opening and closing the above valves, the flow direction of cooling water in the circulating water system can be controlled.

[0042] Furthermore, in this embodiment, the circulating water pump outlet hydraulic control valve 31, the condenser inlet valve 51, the condenser outlet valve 52, the auxiliary machine water pump inlet valve 81, and the auxiliary machine water pump outlet valve 82 are all butterfly valves.

[0043] Furthermore, in this embodiment, the commissioning water pump 11 is a self-priming pump. The commissioning water pump 11 is installed on the top plate of the cooling tower outlet channel 2 or the pump house forebay of the circulating water pump 3, requiring no foundation fixation and facilitating installation. During the commissioning and trial operation of the unit, the commissioning water pump 11 is connected in parallel to the nearby circulating water inlet pipe 4 via the first bypass pipe 12. A second bypass pipe 13 is added in parallel before and after the auxiliary machine water pump inlet valve 81 and the auxiliary machine water pump outlet valve 82 to bypass the auxiliary machine water pump 8. When a single auxiliary machine in the auxiliary equipment group 9 requires cooling water during commissioning, the circulating water pump outlet hydraulic control valve 31, condenser inlet valve 51, condenser outlet valve 52, auxiliary machine water pump inlet valve 81, and auxiliary machine water pump outlet valve 82 are closed respectively, thus forming a commissioning period circulating water system. The process is as follows:

[0044] Cooling tower 1 (outlet end: tower pool) → Cooling tower water outlet channel 2 → Debugging water pump 11 → First bypass pipe 12 → Circulating water inlet pipe 4 → Auxiliary machine cooling water inlet pipe 7 → Second bypass pipe 13 → Auxiliary machine equipment group 9 → Auxiliary machine cooling water outlet pipe 10 → Circulating water outlet pipe 6 → Cooling tower 1 (inlet end: central water distribution shaft).

[0045] By adopting the improved commissioning circulating water process described above in this embodiment, the circulating water pump 3 and auxiliary water pump 8 in the original circulating water system are bypassed. During the commissioning of the unit, the circulating water pump 3 and auxiliary water pump 8 are not turned on. The commissioning water pump 11 provides power to the system and provides circulating cooling water to the auxiliary equipment group 9, thereby reducing the power consumption of the circulating water pump 3 and auxiliary water pump 8 and achieving the effect of energy saving and consumption reduction.

[0046] In this embodiment, the flow rate of the commissioning water pump 11 is sufficient to meet the sum of the cooling water volumes of the auxiliary equipment simultaneously started in the auxiliary equipment group 9, thereby reducing the equipment cost and power consumption of the commissioning water pump 11. Taking a million-kilowatt unit as an example, its flow rate is approximately 600 t / h. The head of the commissioning water pump 11 meets the sum of the dynamic head and static head of the circulating water system during the commissioning period. Taking a million-kilowatt unit as an example, its head is approximately 30 m. The diameter of the outlet pipe of the commissioning water pump 11 only needs to meet the flow rate of the commissioning water pump 11. Taking a million-kilowatt unit as an example, its pipe diameter is approximately DN450. The outlet pipe of the commissioning water pump 11, i.e., the first bypass pipe 12, is connected to the circulating water inlet pipe 4 as close as possible to make full use of the existing circulating water inlet pipe 4, shorten the required pipe length of the first bypass pipe 12, thereby reducing the engineering workload and cost of the temporary commissioning system.

[0047] In this embodiment, the two ends of the second bypass pipe 13 are connected to the auxiliary machine water pump inlet valve 81 and the auxiliary machine water pump outlet valve 82, respectively; the pipe diameter of the second bypass pipe 13 is the same as that of the first bypass pipe 12.

[0048] Once the unit enters the joint commissioning phase, the commissioning pump 11, the first bypass pipe 12, and the second bypass pipe 13 will be removed, and the original circulating water system will be restored (e.g., Figure 1 (As shown); the dismantled commissioning pump 11, first bypass pipe 12, and second bypass pipe 13 can be used for subsequent units or other projects as recycled materials.

[0049] After adopting the energy-saving commissioning system of this embodiment for thermal power plants, taking a single 1,000 MW unit as an example, the power of the commissioning pump 11 motor is only 75 kW; while the power of a single circulating water pump 3 (3 in total) is 3500 kW, and the power of the auxiliary pump 8 is 315 kW. Considering that only one circulating water pump 3 is operated during the commissioning period of a single unit, the commissioning-period circulating water system can replace the original circulating water system, reducing the equipment power by 3740 kW. Based on a 2-month commissioning period for a single unit, with the equipment operating 20 hours per day, using the commissioning-period circulating water system reduces power consumption by 4,488,000 kW, saving 2.6928 million yuan in electricity costs (based on an average electricity price of 0.6 yuan / kWh). For two units, this translates to a saving of 5.3856 million yuan. Therefore, the energy-saving commissioning system of this embodiment for thermal power plants has significant energy-saving effects and economic benefits.

[0050] This embodiment of a thermal power plant commissioning energy-saving system establishes a commissioning circulating water system by adding a commissioning water pump 11, a first bypass 12, and a second bypass 13. The original circulating water pump 3 and auxiliary machine water pump 8 are bypassed, avoiding the operation of the circulating water pump 3 and auxiliary machine water pump 8 during the unit commissioning stage. This allows the commissioning water pump 11 to supply cooling water to the auxiliary equipment group 9 during the unit commissioning period, reducing the start-up time of the circulating water pump 3 and auxiliary machine water pump 8, thereby reducing power consumption and saving commissioning costs during the unit commissioning period.

[0051] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A commissioning and energy-saving system for thermal power plants, characterized in that, include: Cooling tower; The cooling tower outlet channel is connected at one end to the outlet end of the cooling tower pool. A circulating water inlet pipe is connected at one end to the other end of the cooling tower outlet channel; a circulating water pump and a condenser are connected in sequence on the circulating water inlet pipe. The circulating water outlet pipe has one end connected to the other end of the circulating water inlet pipe, and the other end connected to the inlet end of the central water distribution shaft of the cooling tower. The auxiliary machine cooling water inlet pipe has one end connected to the circulating water inlet pipe between the circulating water pump and the condenser, and the other end connected to one end of the auxiliary machine cooling water outlet pipe; the other end of the auxiliary machine cooling water outlet pipe is connected to the circulating water outlet pipe; the auxiliary machine cooling water inlet pipe is sequentially connected to an auxiliary machine water pump and an auxiliary machine equipment group; the auxiliary machine equipment group includes multiple auxiliary machine equipment connected in parallel; The first bypass pipe is connected in parallel to both ends of the circulating water pump; A second bypass pipe is connected in parallel to both ends of the auxiliary water pump; and, Debug the water pump, which is connected to the first bypass pipe or the second bypass pipe.

2. The energy-saving commissioning system for thermal power plants as described in claim 1, characterized in that, The outlet of the circulating water pump is connected to a circulating water pump outlet hydraulic control valve.

3. The energy-saving commissioning system for thermal power plants as described in claim 2, characterized in that, The condenser is connected to a condenser inlet valve and a condenser outlet valve at its inlet and outlet, respectively.

4. The energy-saving commissioning system for thermal power plants as described in claim 3, characterized in that, The auxiliary water pump is connected to an auxiliary water pump inlet valve and an auxiliary water pump outlet valve at its inlet and outlet, respectively.

5. The energy-saving commissioning system for thermal power plants as described in claim 4, characterized in that, The circulating water pump outlet hydraulic control valve, the condenser inlet valve, the condenser outlet valve, the auxiliary machine water pump inlet valve, and the auxiliary machine water pump outlet valve are all butterfly valves.

6. A power plant commissioning energy-saving system as described in any one of claims 1-5, characterized in that, The test pump is a self-priming pump, and the test pump is installed in the outlet channel of the cooling tower.

7. A power plant commissioning energy-saving system as described in any one of claims 1-5, characterized in that, The flow rate of the test pump meets the sum of the cooling water volume of the auxiliary equipment that starts simultaneously in the auxiliary equipment group, and the head of the test pump meets the sum of the dynamic head and static head of the circulating water system during the test period.

8. A power plant commissioning energy-saving system as described in any one of claims 1-5, characterized in that, The first bypass pipe and the second bypass pipe have the same diameter.

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