CN220582402U - Coal-fired boiler with particle heating function for thermal power station - Google Patents
Coal-fired boiler with particle heating function for thermal power station Download PDFInfo
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- CN220582402U CN220582402U CN202321778281.4U CN202321778281U CN220582402U CN 220582402 U CN220582402 U CN 220582402U CN 202321778281 U CN202321778281 U CN 202321778281U CN 220582402 U CN220582402 U CN 220582402U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 91
- 239000002245 particle Substances 0.000 title claims abstract description 76
- 239000011163 secondary particle Substances 0.000 claims abstract description 73
- 239000011164 primary particle Substances 0.000 claims abstract description 70
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 26
- 239000003546 flue gas Substances 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 description 11
- 238000010248 power generation Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model discloses a coal-fired boiler with a particle heating function for a thermal power station, which comprises a hearth and a burner, wherein the hearth is provided with a horizontal flue and a vertical flue, a primary particle heater is arranged at the upstream of the vertical flue, and a secondary particle heater is arranged in the hearth; the primary particle heater comprises a plurality of groups of primary particle heating tube rows which are connected in parallel and sequentially arranged front and back, and each group of primary particle heating tube rows comprises a plurality of primary particle heating pipelines; the secondary particle heater comprises a plurality of groups of secondary particle heating tube rows which are connected in parallel and are sequentially arranged up and down, each group of secondary particle heating tube rows comprises a plurality of secondary particle heating pipelines, and each secondary particle heating pipeline is arranged at the inlet of the horizontal flue in an inclined mode. The coal-fired boiler can store redundant heat in particles through the particle heater while heating steam and water to ensure the normal operation of a power plant, and the variable load peak regulation capacity and the combustion stability of the coal-fired boiler are improved.
Description
Technical Field
The utility model relates to the technical field of coal-fired power generation, in particular to a coal-fired boiler with a particle heating function for a thermal power station.
Background
The coal reserves of China reach 1.67 trillion tons, account for 13% of global coal resources, the 'rich coal, less gas and lean oil' are basic national conditions of China, and the future medium-and-long-term thermal power generation is still an important component of the Chinese energy structure.
In recent years, the installed capacity of wind power generation and photovoltaic power generation is rapidly improved, and great challenges are brought to the volatility and stability of a power grid. In the present stage, the flexibility of the thermal power plant is poor, the variable load rate is usually 1-2% Pe/min, and the load fluctuation of the power grid caused by wind power/photovoltaic power generation cannot be stabilized. Therefore, the flexibility of the existing thermal generator set is improved, the power generation efficiency is improved, and the method has important significance for maintaining the energy safety of China and constructing a low-carbon, high-efficiency and clean energy system. The key for improving the flexibility of the thermal generator set is the load control of the boiler.
Because boiler combustion has some thermal inertia, the load change rate of the boiler is usually not more than 1%. Meanwhile, the combustion stability and economy of the boiler are reduced during low load operation.
Disclosure of Invention
The utility model aims to provide a coal-fired boiler with a particle heating function for a thermal power station. The coal-fired boiler can store redundant heat in particles through the particle heater while heating steam and water to ensure the normal operation of a power plant, and the variable load peak regulation capacity and the combustion stability of the coal-fired boiler are improved.
In order to achieve the above purpose, the utility model provides a coal-fired boiler with a particle heating function for a thermal power station, which comprises a hearth and a burner arranged in the hearth, wherein the hearth is provided with a horizontal flue and a vertical flue, a primary particle heater corresponding to an outlet of the horizontal flue is arranged at the upstream of the vertical flue, and a secondary particle heater is arranged above the inside of the hearth; the primary particle heater comprises a plurality of groups of primary particle heating tube rows which are connected in parallel and sequentially arranged front and back, each group of primary particle heating tube rows comprises a plurality of primary particle heating pipelines, and each primary particle heating pipeline is provided with a vertical part perpendicular to the horizontal flue and an inclined part led outwards; the secondary particle heater comprises a plurality of groups of secondary particle heating tube rows which are connected in parallel and are sequentially arranged up and down, each group of secondary particle heating tube rows comprises a plurality of secondary particle heating pipelines, and each secondary particle heating pipeline is arranged at the inlet of the horizontal flue in an inclined mode.
Optionally, the primary particle heater is provided with a primary particle distributor, an inlet of the primary particle heating pipeline is connected with the primary particle distributor, and the primary particle distributor is provided with a primary gas inlet and a primary particle inlet; the secondary particle heater is provided with a secondary particle distributor, an inlet of the secondary particle heating pipeline is connected with the secondary particle distributor, and the secondary particle distributor is provided with a secondary gas inlet and a secondary particle inlet.
Optionally, an outlet of the primary particle heater is connected with a particle transport device, and an outlet of the particle transport device is connected with the secondary particle heater.
Optionally, the inlets and outlets of the primary particle heating pipeline and the secondary particle heating pipeline are respectively provided with a particle high-temperature valve.
Optionally, the connection angle of the vertical portion and the inclined portion of the primary particle heating pipeline is less than 60 °.
Optionally, the inclination angle of the secondary particle heating pipe is less than or equal to 45 °.
Optionally, the primary particle heating pipeline has an inner diameter of 50mm-70mm and a wall thickness of 8mm-12mm, and the secondary particle heating pipeline has an inner diameter of 50mm-70mm and a wall thickness of 10mm-14mm.
Optionally, the pipeline materials of the primary particle heating pipeline and the secondary particle heating pipeline are carbon steel.
Optionally, the heatable particle size within the primary and secondary particle heaters is in the range of 300 microns to 1000 microns.
Optionally, be equipped with multistage superheater and reheater in the horizontal flue, be equipped with the economizer in the perpendicular flue, the exit linkage steam pocket system of economizer and be equipped with the valve, the export of horizontal flue with perpendicular flue export is through parallelly connected first flue gas circulation pipeline and second flue gas circulation pipeline to the furnace, the second flue gas circulation pipeline is equipped with flue gas circulating fan.
The coal-fired boiler with the particle heating function for the thermal power station is provided with the primary particle heater and the secondary particle heater, the flue gas of the boiler can heat solid particles while heating the steam-water system, the heated solid particles are stored in the particle heating tank, and when the load is low or reduced, the redundant heat of the boiler can be absorbed by the particles and stored in the heating tank, so that the combustion stability and the power generation economy are improved; when the load is high or the load is increased, the particles stored in the heat tank can release heat through the heat exchanger, so that the load increasing climbing capacity of the unit is improved, the low-load stable combustion and rapid load change of the boiler are realized, and the energy utilization grade is improved.
Drawings
FIG. 1 is a schematic view of a coal-fired boiler with a particle heating function for a thermal power plant according to an embodiment of the present utility model;
FIG. 2 is a schematic view of the primary particle heater shown in FIG. 1;
FIG. 3 is a left side view of the primary particle heater of FIG. 2;
FIG. 4 is a schematic view of the structure of the secondary particle heater shown in FIG. 1;
fig. 5 is a top view of the secondary particle heater shown in fig. 2.
In the figure:
1. furnace 2, burner 3, multi-stage superheater 4, reheater 5, economizer 6, steam drum system 7, flue gas recirculation fan 8, valve 9, first flue gas recirculation line 10, second flue gas recirculation line 11, primary particulate heater 111, primary particulate heating conduit 112, primary particulate distributor 113, primary gas inlet 114, primary particulate inlet 115, primary particulate high temperature valve 12, secondary particulate heater 121, secondary particulate heating conduit 122, secondary particulate distributor 123, secondary gas inlet 124, secondary particulate inlet 125, secondary particulate high temperature valve
Detailed Description
In order to better understand the aspects of the present utility model, the present utility model will be described in further detail with reference to the accompanying drawings and detailed description.
In the present specification, the terms "upper, lower, inner, outer" and the like are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may be changed according to the drawings, so that the terms are not to be construed as absolute limitation of the protection scope; moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a coal-fired boiler with a particle heating function for a thermal power station according to an embodiment of the present utility model.
As shown in the figure, in a specific embodiment, the coal-fired boiler with the particle heating function for the thermal power station mainly comprises a hearth 1, a combustor 2, a multi-stage superheater 3, a reheater 4, an economizer 5, a steam drum system 6, a flue gas circulating fan 7 and the like.
The burner 2 is located inside the furnace 1, the furnace 1 is provided with a horizontal flue and a vertical flue, the multi-stage superheater 3 and the reheater 4 are arranged in the horizontal flue, the economizer 5 is located in the vertical flue, an outlet of the economizer 5 is connected with the steam drum system 6, a valve 8 is arranged on a connecting pipe, an outlet of the horizontal flue and an outlet of the vertical flue are communicated to the furnace 1 through a first flue gas circulating pipeline 9 and a second flue gas circulating pipeline 10 which are connected in parallel, and the second flue gas circulating pipeline is provided with a flue gas circulating fan 7.
Since the flue gas circulation pipeline and the flue gas circulation fan 7 are arranged at the horizontal flue gas outlet and the vertical flue gas outlet, the boiler load can be adjusted by adjusting the flue gas recirculation proportion and the burner power.
The boiler is internally provided with two-stage particle heaters, and when flue gas flows through a flue, the flue gas sequentially passes through different heat exchange devices, and solid particles are heated in batches when the steam and water are heated.
Specifically, a primary particle heater 11 corresponding to the outlet of the horizontal flue is arranged at the upstream of the vertical flue, and a secondary particle heater 12 is arranged at the upper part of the interior of the hearth.
The primary particle heater 11 has four groups of parallel primary particle heating tube rows arranged in sequence one after the other, each group of primary particle heating tube rows has fifty-six primary particle heating tubes 111, and each primary particle heating tube 111 has a vertical portion perpendicular to the horizontal flue and an inclined portion led out outwards; the secondary particle heater 12 has two sets of parallel and up-down arranged secondary particle heating tube rows, each set of secondary particle heating tube rows having thirty-two secondary particle heating tubes 121, each secondary particle heating tube 121 being arranged in an inclined manner at the inlet of the horizontal flue.
The outlet of the primary particle heater 11 is connected with a particle transport device (not shown in the figure), the outlet of the particle transport device is connected with the secondary particle heater 12, and particles output by the primary particle heater 11 can be transported to the secondary particle heater 12 to be heated continuously through the particle transport device.
Referring to fig. 2 and 3 together, fig. 2 is a schematic structural diagram of the primary particle heater shown in fig. 1; fig. 3 is a left side view of the primary particulate heater shown in fig. 2.
As shown in the figure, the primary particle heater 11 mainly heats solid particles in a metal pipe wall by means of convection heat exchange with flue gas, and then indirectly heats the solid particles, and is provided with a primary particle distributor 112, an inlet of the primary particle heating pipe 111 is connected to the primary particle distributor 112, the primary particle distributor 112 is provided with a primary gas inlet 113 and a primary particle inlet 114, and an inlet and an outlet of the primary particle heating pipe 111 are respectively provided with a primary particle high-temperature valve 115.
The inner diameter of each primary particle heating pipeline 111 is 60mm, the wall thickness is 10mm, the pipeline material adopts high-temperature-resistant abrasion-resistant carbon steel, the pipeline material can work below 800 ℃, the particle flow is driven by gravity, and the particle flow and the flow velocity in each pipeline can be independently regulated by regulating the primary particle high-temperature valve 115 at the inlet and the outlet of each pipeline. To prevent clogging of particles within the tube, the vertical portion of the primary particle heating conduit 111 is connected to the inclined portion at an angle of less than 60 °.
Since the primary particle distributor 112 is provided with the primary gas inlet 113, when no solid particles exist in the primary particle heating pipeline 111, gas can be introduced, and the primary particle heater 11 is prevented from being damaged due to dry burning.
With continued reference to fig. 4 and 5, fig. 4 is a schematic structural diagram of the secondary particle heater shown in fig. 1; fig. 5 is a top view of the secondary particle heater shown in fig. 2.
As shown in the figure, the secondary particle heater 12 is arranged at the inlet of the horizontal flue of the furnace in an inclined manner, and is provided with a secondary particle distributor 122, the inlet of the secondary particle heating pipeline 121 is connected to the secondary particle distributor 122, the secondary particle distributor 122 is provided with a secondary gas inlet 123 and a secondary particle inlet 124, and the inlet and the outlet of the secondary particle heating pipeline 121 are respectively provided with a secondary particle high-temperature valve 125.
The inner diameter of each secondary particle heating pipeline 121 is 60mm, the wall thickness is 12mm, the pipeline material adopts high-temperature-resistant and abrasion-resistant carbon steel, the pipeline material can work below 1700 ℃, particles slowly flow in the inclined pipe by means of self gravity, the particle flow rate in each pipeline can be independently controlled by setting the inclined angle and adjusting the opening of the secondary particle high-temperature valve 125, and the inclined angle of the secondary particle heating pipeline 121 is not more than 45 degrees in order to prevent the particle flow rate from being too fast.
Because the secondary particle distributor 122 is provided with the secondary gas inlet 123, when no solid particles exist in the secondary particle heating pipeline 121, gas can be introduced, and the damage of the heater caused by dry burning of the secondary particle heater 12 is prevented.
When the boiler operates, coal dust enters a hearth 1, is combusted by a combustor 2, sequentially flows through a flue and heats all parts, and flue gas sequentially flows through different heat exchange devices when flowing through the flue, heats solid particles while heating steam and water, and internally arranges two-stage particle heaters to heat the solid particles in batches, wherein the particles are fed into a primary particle heater from an A port from a cold tank for storing the particles, the heat preservation temperature of the cold tank is 200 ℃, and can be initially heated to 400 ℃ after entering the primary particle heater 11; then, the primarily heated particles are sent from the port B to the secondary particle heater 12 via the particle transport device to continue further heating, the secondary particle heater 12 heats the particles in the tube from 400 ℃ to over 700 ℃ mainly by radiating the particles in the heat transfer tube, and then the heated particles are sent from the port C to the particle heat tank for storage.
In addition, when the boiler is in the operating condition that the particles do not need to be heated, the particle inlet of the primary or secondary particle heater can be closed, and the primary or secondary gas inlet is opened to introduce gas into the pipe, so that the overtemperature of the pipeline is prevented, and the safe operating state of the pipeline in the boiler is ensured when the particles are not heated.
The heated solid particles adopt silicon carbide particles or olivine particles with stable thermochemical performance, the particle size ranges from 300 micrometers to 1000 micrometers, and the particles do not involve phase change and thermochemical reaction in the heat charging and discharging process and can be recycled.
The above embodiments are merely preferred embodiments of the present utility model, and are not limited thereto, and on the basis of these, specific adjustments may be made according to actual needs, thereby obtaining different embodiments. For example, further adjustments may be made to the number of pipes for primary particle heater 11 and secondary particle heater 12, or the particle transport device may be omitted, solid particles may be transferred from primary particle heater 11 to secondary particle heater 12 entirely by gravity, etc. This is not illustrated here, as there are many possible implementations.
When the coal-fired boiler is in low load or load reduction, redundant heat can be stored in particles through the particle heater, so that the variable load peak regulation capacity and the combustion stability of the coal-fired boiler are improved; when the load is high or the load is increased, the particles stored in the heat tank can release heat through the heat exchanger, so that the load increasing climbing capacity of the unit is improved, the low-load stable combustion and rapid load change of the boiler are realized, and the energy utilization grade is improved.
The coal-fired boiler with the particle heating function for the thermal power plant provided by the utility model is described above in detail. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the utility model. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
Claims (10)
1. The coal-fired boiler with the particle heating function for the thermal power station comprises a hearth and a burner arranged in the hearth, wherein the hearth is provided with a horizontal flue and a vertical flue; the primary particle heater comprises a plurality of groups of primary particle heating tube rows which are connected in parallel and sequentially arranged front and back, each group of primary particle heating tube rows comprises a plurality of primary particle heating pipelines, and each primary particle heating pipeline is provided with a vertical part perpendicular to the horizontal flue and an inclined part led outwards; the secondary particle heater comprises a plurality of groups of secondary particle heating tube rows which are connected in parallel and are arranged up and down in sequence, each group of secondary particle heating tube rows comprises a plurality of secondary particle heating pipelines, and each secondary particle heating pipeline is obliquely arranged at the inlet of the horizontal flue.
2. The coal-fired boiler with a particle heating function for a thermal power plant according to claim 1, wherein the primary particle heater is provided with a primary particle distributor, an inlet of the primary particle heating pipe is connected to the primary particle distributor, and the primary particle distributor is provided with a primary gas inlet and a primary particle inlet; the secondary particle heater is provided with a secondary particle distributor, an inlet of the secondary particle heating pipeline is connected with the secondary particle distributor, and the secondary particle distributor is provided with a secondary gas inlet and a secondary particle inlet.
3. The coal-fired boiler with a particle heating function for a thermal power plant according to claim 2, wherein the outlet of the primary particle heater is connected to the secondary particle heater through a particle transport device.
4. A coal-fired boiler with a particle heating function for a thermal power plant according to claim 3, wherein the inlets and outlets of the primary particle heating pipe and the secondary particle heating pipe are respectively provided with a particle high temperature valve.
5. A coal-fired boiler with a particulate heating function for a thermal power plant according to any one of claims 1 to 4, wherein the connection angle of the vertical portion and the inclined portion of the primary particulate heating pipe is less than 60 °.
6. The coal-fired boiler with a particle heating function for a thermal power plant according to any one of claims 1 to 4, wherein the inclination angle of the secondary particle heating pipe is 45 ° or less.
7. The coal-fired boiler with a particle heating function for a thermal power plant according to claim 1, wherein the primary particle heating pipe has an inner diameter of 50mm to 70mm and a wall thickness of 8mm to 12mm, and the secondary particle heating pipe has an inner diameter of 50mm to 70mm and a wall thickness of 10mm to 14mm.
8. The coal-fired boiler with a particle heating function for a thermal power plant according to claim 7, wherein the pipe materials of the primary particle heating pipe and the secondary particle heating pipe are carbon steel.
9. The coal-fired boiler with a particle heating function for a thermal power plant according to claim 1, wherein the heatable particle size inside the primary particle heater and the secondary particle heater ranges from 300 μm to 1000 μm.
10. The coal-fired boiler with a particle heating function for a thermal power station according to claim 1, wherein a multi-stage superheater and a reheater are arranged in the horizontal flue, an economizer is arranged in the vertical flue, an outlet of the economizer is connected with a steam drum system and is provided with a valve, an outlet of the horizontal flue and an outlet of the vertical flue are communicated to the hearth through a first flue gas circulation pipeline and a second flue gas circulation pipeline which are connected in parallel, and a flue gas circulation fan is arranged in the second flue gas circulation pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321778281.4U CN220582402U (en) | 2023-07-07 | 2023-07-07 | Coal-fired boiler with particle heating function for thermal power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321778281.4U CN220582402U (en) | 2023-07-07 | 2023-07-07 | Coal-fired boiler with particle heating function for thermal power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220582402U true CN220582402U (en) | 2024-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321778281.4U Active CN220582402U (en) | 2023-07-07 | 2023-07-07 | Coal-fired boiler with particle heating function for thermal power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220582402U (en) |
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2023
- 2023-07-07 CN CN202321778281.4U patent/CN220582402U/en active Active
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