Air heater system and thermal power equipment

Abstract

The utility model discloses an air heater system and thermal power equipment. The air heater system comprises a primary hot air main pipe and an induced air header pipe, a first hot air branch pipe is communicated with the lower-layer plasma combustion-supporting system, a second hot air branch pipe is communicated with the upper-layer plasma combustion-supporting system, and a third hot air branch pipe is communicated with a combustor of the plasma-free combustion-supporting system; the air inducing main pipe is sequentially provided with a main baffle door, an air heater and an outlet adjusting door; the air heater system is communicated with the third hot air branch pipe, and the air heater is also communicated with the first hot air branch pipe and the second hot air branch pipe. The air inducing header pipe is connected between the third hot air branch pipe and the second hot air branch pipe and between the third hot air branch pipe and the first hot air branch pipe, and when the air heater system is not needed, the air heater system can be effectively cut off. When the boiler is in cold start, the air heater system can be communicated with the plasma combustion-supporting system on the lower layer. When the boiler is started in a temperature state, the air heater system can be communicated with the upper layer plasma combustion-supporting system, and the temperature requirement before primary air powder airflow enters a hearth can be met.

Description

Technical Field

[0001] The utility model relates to the field of thermal power generation equipment, in particular to a heater system and thermal power equipment. Background Art

[0002] Thermal power plants are referred to as thermal power plants. Thermal power plants use combustibles as fuel to produce electricity. The basic production process of thermal power plants includes: when the fuel is burned, it heats water to generate steam, converting the chemical energy of the fuel into thermal energy, and the steam pressure drives the turbine to rotate, converting the thermal energy into mechanical energy, and then the turbine drives the generator to rotate, converting the mechanical energy into electrical energy.

[0003] The application of plasma combustion-assisted technology in pulverized coal boilers has become increasingly mature. In the past, most of them were single-layer plasma. However, with the increasing proportion of renewable energy power generation, thermal power units are increasingly playing the role of peak regulation to ensure the safety and stability of the power grid.

[0004] When the thermal power unit is operating at low load, the plasma combustion-supporting system was originally set at the bottom layer of the four-corner tangential combustion boiler. Then, another layer of plasma combustion-supporting system will be set on top of the four-corner tangential combustion boiler. It can stabilize the combustion and increase the height of the flame center to meet the thermal power unit's requirements for steam temperature.

[0005] At the same time, when thermal power units are started in cold and warm state, different coal mills are selected as the first mill to start according to the steam temperature requirements for the turbine to start. Under the requirements of energy conservation and emission reduction with less oil and fuel saving, the double-layer plasma design configuration has been increasingly used.

[0006] For four-corner tangential combustion boilers, double-layer plasma is set up. When the first pulverizing system is put into operation, a plasma heater is needed for heating and drying. The second one can often achieve the purpose of pulverized coal heating and drying through the heat generated by the boiler's own combustion, so there is no need for a plasma heater.

[0007] At present, the setting of double-layer plasma heaters is either to set up heaters separately or to set up plasma heaters in the primary hot air main pipe. The former sets up an extra set of plasma heaters, which increases the investment cost and requires a larger installation space. The latter sets up heaters on the main pipe, and there is no way to effectively remove the heater when it is not needed. It becomes a cooler in the later stage. At the same time, in the early stage of such a setting, not all wind energy passes through the heater, which reduces the heating effect of the heater. Utility Model Content

[0008] The technical problem to be solved by the utility model is to overcome the above-mentioned defect that it is difficult to effectively remove the double-layer plasma air heater set on the mother pipe in the prior art, and to provide an air heater system and thermal power equipment.

[0009] The utility model solves the above technical problems through the following technical solutions:

[0010] A heater system is used for the upper plasma combustion-supporting system and the lower plasma combustion-supporting system of a four-corner tangential combustion boiler. The heater system comprises a primary hot air main pipe and an induced draft main pipe. The primary hot air main pipe is provided with a plurality of first hot air branch pipes, a second hot air branch pipe, and a third hot air branch pipe arranged at intervals. The first hot air branch pipe is connected to the lower plasma combustion-supporting system, the second hot air branch pipe is connected to the upper plasma combustion-supporting system, the third hot air branch pipe is connected to a burner without a plasma combustion-supporting system, and the third hot air branch pipe is arranged adjacent to the second hot air branch pipe; the induced draft main pipe is sequentially provided with a main damper door, a heater and an outlet regulating door, and the main damper door is arranged adjacent to the third hot air branch pipe; one end of the heater system is connected to the third hot air branch pipe, and the other end of the heater is respectively connected to the first hot air branch pipe and the second hot air branch pipe.

[0011] In this solution, by adopting the above structure, by connecting the induced draft main pipe between the third hot air branch pipe and the second hot air branch pipe and the first hot air branch pipe, the heater system can be directly and effectively cut off when the heater system is not needed. When the boiler is cold started, the heater system can be used to connect to the lower plasma combustion-supporting system to dry and heat the pulverized coal in the coal mill to meet the temperature requirement before the primary air and pulverized coal airflow enters the furnace. When the boiler is started in a warm state, the heater system can be used to connect to the upper plasma combustion-supporting system to achieve dry heating of the pulverized coal to meet the temperature requirement before the primary air and pulverized coal airflow enters the furnace. The heater system can better meet the needs of different working conditions of the boiler, and it is also convenient to isolate the heater system for maintenance without affecting the operation of the generator set.

[0012] Optionally, the heater system includes an induced air main duct, which is sequentially provided with a main baffle door, an air heater and an outlet adjustment door, and the main baffle door is arranged adjacent to the third hot air branch pipe.

[0013] Optionally, the heater system also includes a first induced air branch pipe and a second induced air branch pipe, the first induced air branch pipe and the second induced air branch pipe are both connected to the outlet adjustment door, the other end of the first induced air branch pipe is connected to the lower plasma combustion-supporting system, and the other end of the second induced air branch pipe is connected to the upper plasma combustion-supporting system.

[0014] Optionally, the heater system further includes a first switching damper door and a second switching damper door, wherein the first switching damper door is disposed on the first air induced branch duct, and the second switching damper door is disposed on the second air induced branch duct.

[0015] Optionally, the first hot air branch pipe is provided with a baffle door and an adjustment door in sequence;

[0016] And / or, the second hot air branch pipe is provided with a baffle door and an adjustment door in sequence;

[0017] And / or, the third hot air branch pipe is sequentially provided with a baffle door and an adjustment door.

[0018] Optionally, a fourth hot air branch pipe is further provided on the primary hot air main pipe, the fourth hot air branch pipe is arranged adjacent to the third hot air branch pipe, and the fourth hot air branch pipe is far away from the second hot air branch pipe, and the fourth hot air branch pipe is connected to a burner without a plasma combustion-supporting system.

[0019] A thermal power plant, comprising the air heater system as described above.

[0020] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0021] The positive and progressive effects of the utility model are:

[0022] The utility model connects the induced draft main pipe between the third hot air branch pipe and the second hot air branch pipe and the first hot air branch pipe, so that the heater system can be directly and effectively cut off when the heater system is not needed. When the boiler is cold started, the heater system can be used to connect to the lower plasma combustion-supporting system to dry and heat the pulverized coal in the pulverizer to meet the temperature requirement before the primary air and pulverized coal airflow enters the furnace. When the boiler is started in a warm state, the heater system can be used to connect to the upper plasma combustion-supporting system to achieve dry heating of the pulverized coal to meet the temperature requirement before the primary air and pulverized coal airflow enters the furnace. The heater system can better meet the needs of different working conditions of the boiler, and it is also convenient to isolate the heater system for maintenance without affecting the operation of the generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a heater system according to an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] Heater system 100

[0026] Air duct 11

[0027] Total baffle door 12

[0028] Heater 13

[0029] Exit regulating door 14

[0030] The first induced air branch pipe 15

[0031] The second induced air branch pipe 16

[0032] First switch baffle door 17

[0033] Second switching flap door 18

[0034] Primary hot air main pipe 20

[0035] The first hot air branch pipe 21

[0036] Second hot air branch pipe 22

[0037] The third hot air branch pipe 23

[0038] Fourth hot air branch pipe 24

[0039] Fifth hot air branch pipe 25

[0040] Baffle door 26

[0041] Adjustment door 27

[0042] Lower plasma combustion system 31

[0043] Upper plasma combustion system 32 DETAILED DESCRIPTION

[0044] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0045] like Figure 1 As shown, this embodiment includes a heater system 100 and a thermal power device, wherein the thermal power device uses the heater system 100.

[0046] The heater system 100 is used for the upper plasma combustion-supporting system 32 and the lower plasma combustion-supporting system 31 of a four-corner tangential combustion boiler. The heater system 100 includes a primary hot air main pipe 20 and an induced air main pipe 11. The primary hot air main pipe 20 is provided with a plurality of first hot air branch pipes 21, second hot air branch pipes 22, and third hot air branch pipes 23 arranged at intervals. The first hot air branch pipe 21 is connected to the lower plasma combustion-supporting system 31, and the second hot air branch pipe 22 is connected to the upper plasma combustion-supporting system 32, the third hot air branch pipe 23 is connected to the burner without the plasma combustion-supporting system, and the third hot air branch pipe 23 is arranged adjacent to the second hot air branch pipe 22; the induced air main pipe 11 is provided with a main damper door 12, a heater 13 and an outlet adjustment door 14 in sequence, and the main damper door 12 is arranged adjacent to the third hot air branch pipe 23; one end of the heater system 100 is connected to the third hot air branch pipe 23, and the other end of the heater 13 is respectively connected to the first hot air branch pipe 21 and the second hot air branch pipe 22. By connecting the induced air main pipe 11 between the third hot air branch pipe 23 and the second hot air branch pipe 22 and the first hot air branch pipe 21, the heater system 100 can be directly and effectively removed when it is not needed. When the boiler is cold started, the heater system 100 can be used to connect to the lower plasma combustion-supporting system 31 to dry and heat the pulverized coal in the pulverizer to meet the temperature requirements before the primary air and pulverized coal airflow enters the furnace. When the boiler is started in warm state, the heater system 100 can be used to connect the upper plasma combustion-supporting system 32 to achieve dry heating of the pulverized coal and meet the temperature requirement of the primary air-powder airflow before entering the furnace. The heater system 100 can better meet the needs of different working states of the boiler, and it is also convenient to isolate the heater system 100 for maintenance without affecting the operation of the generator set.

[0047] The heater system 100 includes an air intake main duct 11 , which is provided with a main damper door 12 , an air heater 13 and an outlet adjustment door 14 in sequence. The main damper door 12 is arranged adjacent to the third hot air branch duct 23 .

[0048] The heater system 100 also includes a first induced air branch 15 and a second induced air branch 16. Both the first induced air branch 15 and the second induced air branch 16 are connected to the outlet adjustment door 14. The other end of the first induced air branch 15 is connected to the lower plasma combustion-supporting system 31, and the other end of the second induced air branch 16 is connected to the upper plasma combustion-supporting system 32.

[0049] The heater system 100 further includes a first switch damper door 17 and a second switch damper door 18 . The first switch damper door 17 is disposed on the first air induced branch duct 15 , and the second switch damper door 18 is disposed on the second air induced branch duct 16 .

[0050] The first hot air branch pipe 21, the second hot air branch pipe 22, and the third hot air branch pipe 23 are sequentially provided with a baffle door 26 and an adjustment door 27.

[0051] A fourth hot air branch pipe 24 is also provided on the primary hot air main pipe 20. The fourth hot air branch pipe 24 is provided adjacent to the third hot air branch pipe 23 and away from the second hot air branch pipe 22. The fourth hot air branch pipe 24 is connected to the boiler without a plasma combustion-supporting system. As an embodiment, a fifth hot air branch pipe 25 may also be provided.

[0052] This embodiment also includes a thermal power plant, which includes the above-mentioned air heater system 100. The air heater system can provide hot air for the boiler.

[0053] Combination Figure 1 The four-corner tangential combustion double-layer plasma heater system 100 includes a primary hot air main pipe 20, which leads out the induced air main pipe 11 in front of the hot air damper door 26 of the adjacent non-plasma layer closest to the plasma layer. The induced air main pipe 11 is sequentially provided with a main damper door 12, a heater 13, and an outlet regulating door 14, and a first induced air branch pipe 15 and a second induced air branch pipe 16 are separated after the outlet regulating door 14. The first induced air branch pipe 15 and the second induced air branch pipe 16 are respectively connected to the outlet of the regulating door 27 installed with the plasma layer hot air duct, and the first induced air branch pipe 15 and the second induced air branch pipe 16 are respectively provided with a first switching damper door 17 and a second switching damper door 18, so as to switch between them when different layers of plasma are put into operation in the cold and warm start-up modes.

[0054] When the four-corner tangential combustion boiler is cold-started, the steam temperature requirement for the turbine is relatively low, and the lower plasma combustion-supporting system 31 is put into operation. The primary air enters the outlet position of the hot air regulating door 27 of the lower plasma combustion-supporting system 31 from the induced draft main pipe 11, the main damper door 12, the heater 13, the outlet regulating door 14, the first induced draft branch pipe 15, and the first switching damper door 17 to dry and heat the coal powder in the coal mill to meet the temperature requirement before the primary air powder airflow enters the furnace. As the boiler load increases, the coal powder in the coal mill can be heated and dried using the heat generated by the boiler itself. At this time, the outlet regulating door 14, the main damper door 12, and the first switching damper door 17 are closed, so that the heater system 100 can be isolated.

[0055] When the boiler of the four-corner tangential combustion mode is started in a warm state, the steam temperature requirement for the turbine is relatively high. The upper plasma combustion-supporting system 32 is put into operation to increase the center height of the flame to increase the main steam temperature. The primary air enters the hot air regulating door 27 outlet position of the upper plasma combustion-supporting system 32 from the induced draft main pipe 11, the main damper door 12, the heater 13, the outlet regulating door 14, the second induced draft branch pipe 16, and the second switching damper door 18 to dry and heat the pulverized coal in the coal mill to meet the temperature requirement before the primary air pulverized air flow enters the furnace. As the boiler load increases, the pulverized coal in the coal mill can be heated and dried using the heat generated by the boiler itself. At this time, the outlet regulating door 14, the second damper door 26, and the second switching damper door 18 are closed so that the heater 13 can be isolated.

[0056] When the heater system 100 has a maintenance task, it can also be isolated for maintenance without affecting the operation of the unit.

[0057] The heater system 100 can flexibly switch between cold and warm start-up of the boiler according to the four-corner tangential combustion method. For the first plasma layer to be put into operation, the heater 13 needs to be used for heating. Compared with the original technology, it saves investment and improves the heating effect. It can also be effectively cut off when not in use, and can be repaired if there is a problem without affecting the operation of the unit.

[0058] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A heater system, characterized in that: The heater system is used for the upper plasma combustion-supporting system and the lower plasma combustion-supporting system of a four-corner tangential combustion boiler, and the heater system includes: A primary hot air main pipe, wherein the primary hot air main pipe is provided with a plurality of first hot air branch pipes, a second hot air branch pipe, and a third hot air branch pipe which are arranged at intervals, wherein the first hot air branch pipe is connected to the lower layer plasma combustion-supporting system, the second hot air branch pipe is connected to the upper layer plasma combustion-supporting system, the third hot air branch pipe is connected to a burner without a plasma combustion-supporting system, and the third hot air branch pipe is arranged adjacent to the second hot air branch pipe; An induced air main pipe, wherein the induced air main pipe is provided with a main baffle door, a heater and an outlet regulating door in sequence, and the main baffle door is arranged adjacent to the third hot air branch pipe; One end of the heater system is connected to the third hot air branch pipe, and the other end of the heater is respectively connected to the first hot air branch pipe and the second hot air branch pipe.

2. The air heater system according to claim 1, characterized in that The heater system also includes a first induced air branch pipe and a second induced air branch pipe, both of which are connected to the outlet adjustment door, the other end of the first induced air branch pipe is connected to the lower plasma combustion-supporting system, and the other end of the second induced air branch pipe is connected to the upper plasma combustion-supporting system.

3. The air heater system according to claim 2, characterized in that The heater system further includes a first switching damper door and a second switching damper door, wherein the first switching damper door is disposed on the first air induced branch pipe, and the second switching damper door is disposed on the second air induced branch pipe.

4. The air heater system according to any one of claims 1 to 3, characterized in that: The primary hot air main pipe is also provided with a fourth hot air branch pipe, the fourth hot air branch pipe is arranged adjacent to the third hot air branch pipe, and the fourth hot air branch pipe is far away from the second hot air branch pipe, and the fourth hot air branch pipe is connected to a burner without a plasma combustion-supporting system.

5. A thermal power plant, characterized in that: The thermal power plant includes the air heater system as described in any one of claims 1-4.

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