CN220728279U - Initial starting heating system of coal mill and energy supply system of thermal power generation - Google Patents

Abstract

The present disclosure relates to a primary start heating system of coal pulverizer and thermal power generation's energy supply system, primary start heating system includes: a primary air blower; the vortex tube is provided with an air inlet and an air outlet; the first pipeline is connected between the primary air blower and the air inlet; and one end of the second pipeline is connected with the air outlet, and the other end of the second pipeline is communicated with the coal mill. The primary air is generated through the primary air fan and is input into the vortex tube, the vortex tube discharges hot air from the air outlet after the primary air is processed, and then the hot air is conveyed to the coal mill through the second pipeline to heat the coal mill, so that the primary starting condition is met, the primary air pump is designed, the primary air pump is simple in structure, high in stability and safety, and energy consumption of heating equipment is not required to be additionally increased, and the running cost is saved.

Description

Initial starting heating system of coal mill and energy supply system of thermal power generation

Technical Field

The disclosure relates to the field of thermal power generation, in particular to a primary starting heating system of a coal mill and an energy supply system of thermal power generation.

Background

In a thermal power plant, a furnace and a coal mill for delivering fire coal to the furnace are typically included, the fire coal of the furnace being used to heat a boiler. The coal mill needs to meet the condition that the outlet of the coal mill reaches a certain temperature to start when the coal mill starts, however, the hearth is usually in a cold state at the initial stage of starting the coal mill, i.e. heat for heating primary air blown to the coal mill cannot be generated.

Aiming at the technical problem, the small oil gun burner is additionally arranged at present, the small oil gun burner is arranged on an oil gun burner platform above an inlet air duct of the coal mill, and a large amount of heat generated by igniting the fuel oil of the small oil gun and matching with sealing wind is sent into a primary air loop to heat primary air, so that the coal mill reaches a specified starting condition. However, the small oil gun burner needs to be ignited by using fuel oil, once leakage occurs or the atomization degree is insufficient, the fuel oil can be wrapped and clamped by primary air to enter a hearth, the risk of secondary combustion of the hearth is caused, and the like, so that a great potential safety hazard exists.

Disclosure of Invention

It is an object of the present disclosure to provide an initial start-up heating system for a coal pulverizer and an energy supply system for thermal power generation to at least partially solve the problems in the related art.

To achieve the above object, the present disclosure provides a primary start-up heating system of a coal mill, comprising: a primary air blower; the vortex tube is provided with an air inlet and an air outlet; the first pipeline is connected between the primary air blower and the air inlet; and one end of the second pipeline is connected with the air outlet, and the other end of the second pipeline is connected with the coal mill.

Optionally, the system further comprises a first flow regulating valve and a first stop valve arranged on the first pipeline.

Optionally, a gas booster pump is further included that is disposed within the first conduit.

Optionally, the air outlet device further comprises a second stop valve arranged at the air outlet.

According to a second aspect of the present disclosure, there is provided an energy supply system of a thermal power generation, comprising: the initial starting heating system of the coal mill; a furnace for burning coal to provide heat for the boiler; the coal mill is used for supplying coal to the hearth; the air preheater is connected with a smoke exhaust pipeline of the hearth; the chimney is connected to one end of the smoke exhaust pipeline far away from the air preheater; one end of the third pipeline is used for connecting the air preheater, and the other end of the third pipeline is connected with the primary fan; and one end of the fourth pipeline is used for being connected with the air preheater, and the other end of the fourth pipeline is connected with the second pipeline.

Optionally, the system further comprises a third stop valve and a second flow regulating valve which are arranged on the fourth pipeline.

Optionally, the air conditioner further comprises a fifth pipeline, wherein one end of the fifth pipeline is connected with the primary air blower, and the other end of the fifth pipeline is connected with the second pipeline.

Optionally, a third flow regulating valve and a fourth stop valve are arranged on the fifth pipeline.

Optionally, the system further comprises a sixth pipeline with one end connected with the primary air fan and the other end connected with the second pipeline, wherein a steam heater is arranged on the sixth pipeline.

Optionally, a fifth stop valve and a fourth flow regulating valve are arranged on the sixth pipeline.

Optionally, an air mixing device is further included in the second pipeline.

Through above-mentioned technical scheme, use primary air fan to produce primary air and input into the vortex tube through first pipeline from the air intake, primary air spiral flows in the vortex tube and obtains the hot air and discharge from the air outlet after, and then carries this hot air to the coal pulverizer through the second pipeline in order to heat it, makes the coal pulverizer satisfy the condition of starting just, so design, simple structure, stability and security are high, and do not need additionally to increase firing equipment, practice thrift the energy consumption, reduce running cost.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic illustration of an initial start-up heating system of a coal pulverizer in accordance with an exemplary illustration of the present disclosure;

fig. 2 is an exemplary power supply system for a thermal power plant according to the present disclosure.

Description of the reference numerals

100-primary air blower; 200-vortex tube; 210-an air inlet; 220-an air outlet; 310-a first pipeline; 320-a second line; 330-a third line; 340-fourth line; 350-a fifth line; 360-sixth pipeline; 400-coal mill; 510—a first flow regulating valve; 520-a second flow regulating valve; 530-a third flow regulating valve; 540-fourth flow regulating valve; 610-a first shut-off valve; 620-a second shut-off valve; 630-third stop valve; 640-fourth stop valve; 650-a fifth shut-off valve; 700-gas booster pump; 810-hearth; 820-an air preheater; 830-fume duct; 840-chimney; 900-steam heater.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, terms of orientation such as "inner" and "outer" may be defined based on the actual direction in which the relevant components are used, or may be defined based on their own structure, for example: the gas booster pump arranged in the first pipeline means that the gas booster pump is arranged in the accommodating space of the first pipeline.

In addition, in this disclosure, the terms "first," "second," etc. are used to distinguish one element from another without sequence or importance. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated.

Referring to fig. 1, the present disclosure schematically illustrates a primary start-up heating system of a coal mill, including a primary air blower 100, a vortex tube 200 having an air inlet 210 and an air outlet 220, a first pipe 310 connected between the primary air blower 100 and the air inlet 210, and a second pipe 320 having one end connected to the air outlet 220 and the other end for connection with the coal mill 400. The present disclosure does not limit the connection structure between the piping and the connected components as long as it is sufficient to achieve gas communication.

It should be explained that the vortex tube 200 is also called a fine straight tube ring, and is a heat exchanger for heating and cooling, and the working principle of the vortex tube 200 is based on the vortex effect, when high-speed compressed gas flows in from the air inlet 210 of the vortex tube 200, two spiral gas flows are generated, namely an outer ring vortex and an inner ring vortex, the higher the rotational angular velocity of the vortex close to the central position is, the higher the rotational angular velocity of the gas of the inner ring and the outer ring is, the friction is generated between the layers of the vortex, the energy loss of the gas at the central position is caused by the friction, the temperature of the vortex of the inner ring is reduced, and the temperature of the vortex of the outer ring is increased. After the temperature difference is generated, the high-temperature outer ring vortex flows out from an outlet at one end, and the low-temperature vortex of the inner ring flows out from an outlet at the other end. In the present disclosure, it is the primary air that is heated by the heating principle of the vortex tube 200 and then delivered to the coal mill 400. Since the structure and principle of the vortex tube 200 are well known to those skilled in the art, the description thereof will not be repeated, nor is the present disclosure limited to the specific kind and structure of the vortex tube 200, as long as the effect of heating the primary air can be achieved.

Through using above-mentioned technical scheme, use primary fan 100 to produce primary air and input into vortex tube 200 through first pipeline 310 from air intake 210, primary air flows and obtains the hot air back and discharge from air outlet 220 in vortex tube 200, and then carry this hot air to coal pulverizer 400 in order to heat it through second pipeline 320, make coal pulverizer 400 satisfy the condition of starting just, so design, moreover, the steam turbine is simple in structure, stability and security are high, and do not need additionally to increase heating equipment, the energy consumption is saved, reduce running cost.

Referring to fig. 1, in an embodiment of the present disclosure, the initial start-up heating system of the coal pulverizer may further include a first flow control valve 510 and a first shut-off valve 610 disposed on the first conduit 310. The flow into the vortex tube 200 and thus the temperature of the coal pulverizer 400 can be regulated by the first flow regulating valve 510 (the more hot air is flowing in, the higher the temperature). The first shut-off valve 610 may then be used to shut off the first line 310 when heating using the vortex tube 200 is not required. The present disclosure does not limit the kinds of the first flow rate adjusting valve 510 and the first shut-off valve 610, and may be a direct current type, an angle type, a needle type, etc. according to the difference of the internal structures, or may be a solenoid valve, a manual valve, etc. according to the difference of the control forms.

To ensure the heating effect of the vortex tube 200, in embodiments of the present disclosure, the initial start-up heating system of the coal pulverizer may further include a gas booster pump 700 disposed within the first conduit 310. The gas in the first pipeline 310 can be pressurized by the gas booster pump 700, so that the air inlet 210 of the vortex tube 200 flows into the air with high speed and high pressure, and the air can have a larger initial speed and flow fully after entering the vortex tube 200, so as to obtain the required hot air.

The present disclosure is not limited in the type of gas booster pump 700, for example, in some embodiments it may be a pneumatic booster pump, or in other embodiments it may also be an electric booster pump, a gas-liquid booster pump, or the like.

Referring to fig. 1, in an embodiment of the present disclosure, the initial start-up heating system of the coal pulverizer may further include a second shut-off valve 620 disposed at the air outlet 220. By providing the second stop valve 620, on one hand, the gas in the coal mill 400 can be prevented from flowing back into the vortex tube 200, and on the other hand, the second stop valve can be matched with the first stop valve 610 to separate the vortex tube 200 from the coal mill 400, so that the hot air can be prevented from flowing into the coal mill 400.

Similar to the first shut-off valve 610, the present disclosure does not limit the kind of the second shut-off valve 620, which may be a direct current type, an angle type, a needle type, etc., according to the internal structure distinction, or may be a solenoid valve, a manual valve, etc., according to the control type distinction.

Referring to fig. 2, according to a second aspect of the present disclosure, there is provided a power supply system of thermal power generation, including: the initial starting heating system of the coal mill; a furnace 810 for burning coal to provide heat to the boiler; coal mill 400 for supplying coal to furnace 810; an air preheater 820 connected to a flue 830 of the furnace 810; a chimney 840 connected to an end of the exhaust duct 830 remote from the air preheater 820; a third pipe 330 having one end connected to the air preheater 820 and the other end connected to the primary air blower 100; and a fourth pipe 340 having one end connected to the air preheater 820 and the other end connected to the second pipe 320.

The thermal power generation is a general term for a mode of heating water by using heat energy generated when combustible materials (for example, coal) are burned to change the water into high-temperature and high-pressure steam, and then pushing a generator by the steam to generate electricity, and a power plant using the combustible materials as fuel is generally called a thermal power plant. The energy supply system of thermal power generation provided by the present disclosure refers to a system for supplying heat energy for heating cold water in a boiler and converting the cold water into high-temperature and high-pressure steam, and since the constituent components and principles of thermal power generation are well known to those skilled in the art, the description thereof will not be repeated here.

The present disclosure does not limit the specific structures of the furnace 810, the air preheater 820, the exhaust duct 830, and the chimney 840, as long as it is satisfied that the air preheater 820 can heat the primary air through the high temperature flue gas inside the exhaust duct 830.

In the energy supply system of thermal power generation of the present disclosure, when the system is specifically used, the above initial start heating system is started to heat the coal mill 400, so that after the initial start heating system reaches the start condition, the coal mill 400 is started to supply coal to the furnace 810, the furnace 810 generates high-temperature flue gas, and the high-temperature flue gas is discharged to the chimney 840 through the flue gas duct 830, and simultaneously heats the air preheater 820. At this time, the third and fourth pipelines 330 and 340 are gradually opened and the first pipeline 310 is gradually closed, so that the hot air blown to the coal mill 400 can meet the working conditions of the coal mill 400 by adjusting the flow rates of the fourth pipeline 340 and the first pipeline 310 until the furnace 810 is fully operated so that the fourth pipeline 340 can be independently used for supplying heat to the coal mill 400, and at this time, the first pipeline 310 is completely closed, and the energy supply system of the thermal power generation has all the beneficial effects of the initial start heating system of the coal mill, which are not repeated here.

In order to be able to adjust the temperature within the coal mill 400 (the greater the flow of the fourth conduit 340, the higher the temperature of the coal mill 400), referring to fig. 2, in an embodiment of the present disclosure, the power supply system of the thermal power generation may further include a third shut-off valve 630 and a second flow adjustment valve 520 provided on the fourth conduit 340. The flow rate and the on-off of the fourth pipe 340 can be controlled by the third cutoff valve 630 and the second flow rate adjusting valve 520. Similar to the first shut-off valve 610 and the first flow rate adjustment valve 510 described above, the present disclosure does not limit the kinds of the third shut-off valve 630 and the second flow rate adjustment valve 520, which may be a direct current type, an angle type, a needle type, etc., according to the internal structure differences, or may be a solenoid valve, a manual valve, etc., according to the differences in control form.

When the furnace 810 is fully operated, the coal mill 400 is completely heated by the fourth pipe 340, and in order to prevent the air inputted into the coal mill 400 from being excessively high in temperature by the fourth pipe 340, referring to fig. 2, in an embodiment of the present disclosure, the power supply system for thermal power generation may further include a fifth pipe 350 having one end connected to the primary air fan 100 and the other end connected to the second pipe 320. The fifth pipeline 350 may directly provide cool primary air at a lower temperature to the second pipeline 320, where the cool primary air is mixed with the hot primary air from the fourth pipeline 340 in the second pipeline 320 and discharged to the coal pulverizer 400.

Accordingly, in order to control the flow rate of the cold primary air discharged into the second duct 320 from the fifth duct 350, referring to fig. 2, in an embodiment of the present disclosure, a third flow rate adjustment valve 530 and a fourth shut-off valve 640 may be provided on the fifth duct 350. Similar to the first shut-off valve 610 and the first flow rate adjustment valve 510 described above, the present disclosure does not limit the kinds of the fourth shut-off valve 640 and the third flow rate adjustment valve 530, which may be a direct current type, an angle type, a needle type, etc., according to the internal structure differences, or may be a solenoid valve, a manual valve, etc., according to the differences in control form.

Referring to fig. 2, in an embodiment of the present disclosure, the power supply system of the thermal power generation may further include a sixth pipe 360 having one end connected to the primary air fan 100 and the other end connected to the second pipe 320, wherein a steam heater 900 may be provided on the sixth pipe 360. By such a design, when hot steam is provided in the thermal power plant, the hot primary air is obtained by heating the primary air with the hot steam, and the coal mill 400 is further heated. The sixth conduit 360 may be used in conjunction with the first conduit 310 or may be used alone. This is generally the case where there are multiple hearths 810 within a power plant, and hot steam may be introduced from other hearths 810 to heat the coal mill 400 corresponding to that non-activated hearth 810.

In order to be able to control the temperature of the coal pulverizer 400 by controlling the flow of gas within the sixth conduit 360, referring to fig. 2, a fifth shut-off valve 650 and a fourth flow regulating valve 540 may be provided on the sixth conduit 360 in an embodiment of the present disclosure. Similar to the first shut-off valve 610 and the first flow regulating valve 510 described above, the present disclosure does not limit the kinds of the fifth shut-off valve 650 and the fourth flow regulating valve 540, which may be a direct current type, an angle type, a needle type, etc., according to the internal structure differences, or may be a solenoid valve, a manual valve, etc., according to the differences in control forms.

In order to allow the cold primary air and the hot primary air from the different pipes to be sufficiently mixed in the second pipe 320, in the embodiment of the present disclosure, the power supply system of the thermal power generation may further include an air mixing device (not shown in the drawing) provided in the second pipe 320. The air with different temperatures can be fully mixed by the air mixing device and then discharged into the coal mill 400, so that the problem of inconsistent temperatures at different positions in the coal mill 400 is avoided.

The present disclosure is not limited to the kind of air mixing device, and may be a static mixer, and may be specifically classified into a nozzle type, a vortex type, a porous plate, a shaped plate type, and the like. Or the device can also be a dynamic mixer, and specifically can be composed of a motor, a cavity and injection stirring mixing blades.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (11)

1. A primary start-up heating system for a coal pulverizer, comprising:

a primary air blower;

the vortex tube is provided with an air inlet and an air outlet;

the first pipeline is connected between the primary air blower and the air inlet;

and one end of the second pipeline is connected with the air outlet, and the other end of the second pipeline is connected with the coal mill.

2. The initial start-up heating system of a coal pulverizer of claim 1, further comprising a first flow control valve and a first shut-off valve disposed on the first conduit.

3. The initial start-up heating system of a coal pulverizer of claim 1, further comprising a gas booster pump disposed within the first conduit.

4. The initial start-up heating system of a coal pulverizer of claim 1, further comprising a second shut-off valve disposed at the air outlet.

5. An energy supply system for thermal power generation, comprising:

the initial start-up heating system of a coal pulverizer of any one of claims 1-4;

a furnace for burning coal to provide heat for the boiler;

the coal mill is used for supplying coal to the hearth;

the air preheater is connected with a smoke exhaust pipeline of the hearth;

the chimney is connected to one end of the smoke exhaust pipeline far away from the air preheater;

one end of the third pipeline is connected with the air preheater, and the other end of the third pipeline is connected with the primary fan; and

and one end of the fourth pipeline is connected with the air preheater, and the other end of the fourth pipeline is connected with the second pipeline.

6. The thermal power generation supply system according to claim 5, further comprising a third stop valve and a second flow rate regulating valve provided on the fourth pipe.

7. The thermal power generation system according to claim 6, further comprising a fifth pipe having one end connected to the primary air blower and the other end connected to the second pipe.

8. The thermal power generation supply system according to claim 7, wherein a third flow rate regulating valve and a fourth shutoff valve are provided on the fifth pipe.

9. The thermal power generation system according to claim 5, further comprising a sixth pipeline having one end connected to the primary air blower and the other end connected to the second pipeline, wherein a steam heater is provided on the sixth pipeline.

10. The thermal power generation supply system according to claim 9, wherein a fifth shut-off valve and a fourth flow rate regulating valve are provided on the sixth pipe.

11. The thermal power generation supply system according to claim 5, further comprising an air mixing device provided in the second pipe.