Energy-saving device of boiler air inlet system

Abstract

The utility model provides an energy-saving device of a boiler air inlet system. The energy-saving device comprises a boiler and an air pre-heater. The primary fan is connected with a primary air inlet of the boiler through the air pre-heater and the coal mill in sequence; the secondary fan is connected with a secondary air inlet of the boiler through the air pre-heater; and the input ends of the primary fan and the secondary fan are connected with the air cooling tower. According to the air cooling device, the primary fan and the secondary fan are connected with the air cooling tower, the air with the temperature is sucked from the air cooling tower to serve as the primary air and the secondary air, the air with the waste heat in the air cooling tower is utilized in the mode, an additional heating device is not needed, and therefore the air cooling device has the beneficial effect of saving energy, and the device is easy to arrange and low in cost. Therefore, the device has the characteristic of saving construction cost, through cooperative use of the equipment, the heating energy consumption of primary air and secondary air of the boiler is reduced, and the defect that in a traditional mode, the energy consumption is high due to the fact that the primary air and the secondary air entering the boiler are heated through a heating device is overcome.

Description

Technical Field

[0001] This application relates to the field of energy-saving technology in thermal power plants, and in particular to an energy-saving device for a boiler air intake system. Background Technology

[0002] my country's power supply is still mainly based on thermal power generation, and the main energy source for thermal power generation is coal. In the process of thermal power generation, fuel is burned in the furnace of a boiler, heating the water in the water-cooled walls of the furnace to generate steam, which converts the chemical energy of the fuel into heat energy. The steam pressure drives the turbine to rotate, converting the heat energy into mechanical energy. Then the turbine drives the generator to rotate, converting the mechanical energy into electrical energy to achieve the purpose of power generation.

[0003] During boiler operation, the primary and secondary air required for boiler combustion are usually drawn from outside the boiler room. In order to ensure the air inlet temperature of the air preheater and prevent cold-end corrosion of the air preheater, in seasons or regions with low temperatures, air heaters are usually installed, using steam or electricity as energy to heat the air inlet. Obviously, this heating method requires additional energy consumption, increasing the company's energy consumption. Utility Model Content

[0004] This application provides an energy-saving device for a boiler air intake system, which solves the problem of high energy consumption caused by heating the primary and secondary air entering the boiler using heating devices in traditional methods.

[0005] This application provides an energy-saving device for a boiler air intake system, including a boiler and an air preheater; a primary air fan is connected to the primary air inlet of the boiler in sequence through the air preheater and a coal mill;

[0006] The secondary air fan is connected to the secondary air inlet of the boiler via the air preheater;

[0007] The input terminals of both the primary and secondary air fans are connected to the air-cooled tower.

[0008] Optionally, the boiler's flue is also connected in sequence to an air preheater and a flue gas treatment device.

[0009] Optionally, a first demister is installed between the primary air fan and the air-cooled tower;

[0010] A second demister is installed between the secondary air fan and the air-cooled tower;

[0011] The first and second demisters are each connected to the air-cooled tower in a loop.

[0012] Optionally, the primary air fan is connected to the first air heater via a valve;

[0013] The secondary air fan is connected to the second air heater via a valve.

[0014] Optionally, a first temperature sensor is installed on the duct between the air preheater and the primary air fan;

[0015] A second temperature sensor is installed between the air preheater and the secondary air fan;

[0016] The first temperature sensor, the second temperature sensor, the first air heater, the second air heater, and the valves connected to the primary and secondary air fans are all electrically connected to the controller.

[0017] Optionally, the first demister includes a horizontally arranged housing, and a baffle is arranged inside the housing along the horizontal direction;

[0018] The partition divides the interior of the shell into an upper demisting zone and a lower liquid storage zone. Multiple through holes are provided on the partition to connect the demisting zone and the liquid storage zone.

[0019] The demisting zone is equipped with a demisting net, and the liquid storage zone is connected to the air-cooled tower.

[0020] Optionally, the flue gas treatment device includes a dust collector, a desulfurization tower, and an exhaust chimney connected in series.

[0021] This application provides an energy-saving device for a boiler air intake system. By connecting a primary air fan and a secondary air fan to an air-cooled tower, warm air is drawn from the air-cooled tower as primary and secondary air. This method utilizes the residual heat of the air in the air-cooled tower without the need for additional heating devices, thus achieving the beneficial effect of energy saving. Furthermore, the device is easy to install, thus saving construction costs. The device of this application, through the combined use of the above-mentioned equipment, reduces the heating energy consumption of the boiler's primary and secondary air, overcoming the drawback of high energy consumption caused by heating devices for the primary and secondary air entering the furnace in traditional methods. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of an energy-saving device for a boiler air intake system provided in an embodiment of this application;

[0024] Figure 2 A schematic diagram of an energy-saving device for a boiler air intake system provided in another embodiment of this application;

[0025] Figure 3 A schematic diagram of an energy-saving device for a boiler air intake system provided in yet another embodiment of this application;

[0026] Figure 4 A schematic diagram of an energy-saving device for a boiler air intake system provided in another embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the structure of a first demister provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Boiler; 2. Air preheater; 3. Coal mill; 4. Air-cooled tower; 5. Flue gas treatment device; 6. First air heater; 7. Second air heater; 8. Controller; 21. Primary air fan; 22. Secondary air fan; 51. Dust collector; 52. Desulfurization tower; 53. Exhaust chimney; 100. First temperature sensor; 200. Second temperature sensor; 211. First demister; 221. Second demister; 2111. Shell; 2112. Baffle; 2113. Demisting screen. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0031] like Figure 1 As shown, this application provides an energy-saving device for a boiler air intake system, including a boiler 1 and an air preheater 2; a primary air fan 21 is connected to the primary air inlet of the boiler 1 in sequence through the air preheater 2 and the coal mill 3;

[0032] The secondary air fan 22 is connected to the secondary air inlet of the boiler 1 through the air preheater 2;

[0033] The input terminals of both the primary air fan 21 and the secondary air fan 22 are connected to the air-cooled tower 4.

[0034] When in use, when the heat of the air inside the air-cooled tower 4 meets the requirements, the primary air fan 21 and the secondary air fan 22 are started to extract primary and secondary air with a certain temperature from the air-cooled tower 4.

[0035] Primary and secondary air are introduced into the air preheater 2, where the waste heat of the boiler flue gas is used for heating. The heated primary air then enters the coal mill 3, and the pulverized coal produced by the coal mill 3 is transported to the furnace of the boiler 1 for combustion. The heated secondary air enters through the secondary air inlet on the furnace to supplement the furnace with secondary air.

[0036] This application provides an energy-saving device for a boiler air intake system. By connecting a primary air fan 21 and a secondary air fan 22 to an air-cooled tower 4, warm air is drawn from the air-cooled tower 4 as primary and secondary air. This method utilizes the residual heat of the air in the air-cooled tower 4 without the need for additional heating devices, thus achieving the beneficial effect of energy saving. Furthermore, this device is easy to install, thus saving construction costs. Through the combined use of the above-mentioned equipment, the device of this application reduces the heating energy consumption of the boiler's primary and secondary air, overcoming the drawback of high energy consumption caused by heating the primary and secondary air entering the furnace using heating devices in traditional methods.

[0037] Optionally, such as Figure 2 As shown, the flue of boiler 1 is also connected in sequence to air preheater 2 and flue gas treatment device 5.

[0038] In this application, after the flue gas from boiler 1 enters the flue, it undergoes heat exchange with the economizer and denitrification by the denitrification device before being output to air preheater 2 to heat the primary and secondary air. The flue gas after heat exchange is then input into flue gas treatment device 5 for dust removal and desulfurization processes before being tested and discharged in compliance with standards.

[0039] Optionally, a first demister 211 is provided between the primary air fan 21 and the air-cooled tower 4;

[0040] A second demister 221 is installed between the secondary air fan 22 and the air-cooled tower 4;

[0041] The first demister 211 and the second demister 221 are both connected to the air-cooled tower 4 to form a loop.

[0042] Optionally, such as Figure 5 As shown, the first demister 211 includes a horizontally arranged housing 2111, and a partition 2112 is arranged inside the housing 2111 along the horizontal direction;

[0043] The partition 2112 divides the interior of the housing 2111 into an upper demisting zone and a lower liquid storage zone. The partition 2112 has multiple through holes that connect the demisting zone and the liquid storage zone.

[0044] A demisting net 2113 is installed in the demisting zone, and the liquid storage zone is connected to the air-cooled tower 4.

[0045] In this application, during use, since the air drawn from the air-cooled tower 4 contains a small amount of water mist, the primary air drawn by the primary air fan 21 first passes through the first demister 211. When the primary air containing water mist passes through the first demister 211, the water mist in the primary air is intercepted by the demisting net 2113. The intercepted water mist flows into the liquid storage area in the first demister 211. When a certain amount is accumulated, this water is transferred into the air-cooled tower 4. The primary air that has passed through the demisting is then introduced into the air preheater 2 by the primary air fan 22. It is heated by the waste heat of the boiler flue gas in the air preheater 2. The heated primary air enters the coal mill 3, and the coal powder produced by the coal mill 3 is transported to the furnace of the boiler 1 for combustion.

[0046] Similarly, the secondary air fan 22 draws water mist from the air-cooled tower 4 and, after being demisted by the second demister 221 (the structure of the second demister 221 is the same as that of the first demister 211, so its demisting process is also the same, and will not be described in detail here), enters the air preheater 2 for heat exchange and heating. After heating, it enters the secondary air inlet of the furnace to supplement the furnace with secondary air.

[0047] Optionally, such as Figure 3 As shown, the primary air fan 21 is connected to the first air heater 6 via a valve;

[0048] The secondary air fan 22 is connected to the second air heater 7 via a valve.

[0049] In this application, a warm air heater is installed, which can be used when the boiler is started up for the first time or when the air temperature in the air-cooled tower 4 is too low to meet the usage requirements. It is used to heat the primary air and secondary air and prevent corrosion of the cold end of the air preheater 2.

[0050] Optionally, such as Figure 4 As shown, a first temperature sensor 100 is installed on the pipe between the air preheater 2 and the primary air fan 21;

[0051] A second temperature sensor 200 is installed between the air preheater 2 and the secondary air fan 22;

[0052] The first temperature sensor 100, the second temperature sensor 200, the first air heater 6, the second air heater 7, and the valves connected to the primary fan 21 and the secondary fan 22 are all electrically connected to the controller 8.

[0053] In this application, before the primary air and secondary air enter the air preheater 2, their respective temperatures are detected by the first temperature sensor 100 and the second temperature sensor 200, and the temperature sensors feed back the measured temperatures to the controller 8 in real time. When the temperature of the primary air and / or secondary air is detected to be lower than the preset temperature, the controller 8 controls the valve between the primary air fan 21 and the first air heater 6 to open (and / or controls the valve between the secondary air fan 22 and the second air heater 7 to open), and starts the first air heater 6 (and / or the second air heater 7) to heat the drawn-in air. At the same time, the controller 8 can also control the opening degree of the valve, thereby adjusting the flow rate of the air input from the air-cooled tower 4 and the air heater, so as to control the temperature of the primary air and secondary air input to the air preheater 2 at a suitable temperature, reduce the corrosion of the cold end of the air preheater 2, and at the same time maximize the heat exchange with the flue gas in the air preheater 2.

[0054] Optionally, the flue gas treatment device 5 includes a dust collector 51, a desulfurization tower 52, and an exhaust chimney 53 connected in series.

[0055] In this application, the flue gas from boiler 1 enters the flue and undergoes heat exchange with the economizer and denitrification by the denitrification device before being output to the air preheater 2 to heat the primary and secondary air. The heat-exchanged flue gas is then fed into a dust collector 51 (e.g., a cyclone dust collector, electrostatic precipitator, or bag filter) for dust removal. The dust collector 51 traps and removes solid particles such as soot from the flue gas, reducing the content of solid particles and further reducing the content of pollutants in the flue gas. The dust-removed flue gas then enters a desulfurization tower 52, where the absorbent liquid (e.g., lime slurry or organic amine) absorbs, neutralizes, and removes sulfur oxides from the flue gas. After the desulfurized flue gas passes the test and meets the standards, it can be discharged into the exhaust chimney 53.

[0056] An energy-saving device for a boiler air intake system, the working process of which is as follows:

[0057] When in use, when the heat of the air inside the air-cooled tower 4 meets the requirements, the corresponding valves are switched to the state where both the primary air fan 21 and the secondary air fan 22 are connected to the air-cooled tower 4, and the primary air fan 21 and the secondary air fan 22 are started to extract primary and secondary air with a certain temperature from the air-cooled tower 4.

[0058] Since the air drawn from the air-cooled tower 4 contains a small amount of water mist, the primary air drawn by the primary air fan 21 first passes through the first demister 211. When the primary air containing water mist passes through the first demister 211, the water mist in the primary air is intercepted by the demisting net 2113. The intercepted water mist flows into the liquid storage area in the first demister 211. When a certain amount is accumulated, this water is transferred into the air-cooled tower 4. The primary air that has passed through the demisting fan 22 is then introduced into the air preheater 2, where it is heated by the waste heat of the boiler flue gas in the air preheater 2. The heated primary air then enters the coal mill 3, and the pulverized coal produced by the coal mill 3 is transported to the furnace of the boiler 1 for combustion.

[0059] Similarly, the secondary air fan 22 draws water mist from the air-cooled tower 4 and, after being demisted by the second demister 221 (the structure of the second demister 221 is the same as that of the first demister 211, so its demisting process is also the same, and will not be described in detail here), enters the air preheater 2 for heat exchange and heating. After heating, it enters the secondary air inlet of the furnace to supplement the furnace with secondary air.

[0060] Before entering the air preheater 2, the primary and secondary air are respectively detected by the first temperature sensor 100 and the second temperature sensor 200. The temperature sensors feed back the measured temperature to the controller 8 in real time. When the temperature of the primary air and / or the secondary air is detected to be lower than the preset temperature, the controller 8 controls the valve between the primary air fan 21 and the first air heater 6 to open (and / or controls the valve between the secondary air fan 22 and the second air heater 7 to open), and starts the first air heater 6 (and / or the second air heater 7) to heat the drawn-in air. At the same time, the controller 8 can also control the opening degree of the valve, thereby adjusting the flow rate of the air input from the air-cooled tower 4 and the air heater, so as to control the temperature of the primary and secondary air input to the air preheater 2 at a suitable temperature, reduce the corrosion of the cold end of the air preheater 2, and at the same time maximize the heat exchange with the flue gas in the air preheater 2.

[0061] After entering the flue gas duct, the flue gas from boiler 1 undergoes heat exchange with the economizer and denitrification by the denitrification device before being output to the air preheater 2 to heat the primary and secondary air. The heat-exchanged flue gas is then fed into a dust collector 51 (such as a cyclone dust collector, electrostatic precipitator, or bag filter) for dust removal. The dust collector 51 traps and removes solid particles such as soot from the flue gas, reducing the content of solid particles and further reducing the pollutant content. The dust-removed flue gas then enters the desulfurization tower 52, where the absorbent liquid (such as lime slurry or organic amine) absorbs, neutralizes, and removes sulfur oxides from the flue gas. After passing the desulfurization test, the flue gas can be discharged through the exhaust chimney 53.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An energy-saving device for a boiler air intake system, characterized in that, Includes a boiler (1) and an air preheater (2); The primary air fan (21) is connected to the primary air inlet of the boiler (1) in sequence through the air preheater (2) and the coal mill (3); The secondary air fan (22) is connected to the secondary air inlet of the boiler (1) through the air preheater (2); The input ends of both the primary air fan (21) and the secondary air fan (22) are connected to the air-cooled tower (4).

2. The energy-saving device for the boiler air intake system according to claim 1, characterized in that, The flue of the boiler (1) is also connected in sequence to the air preheater (2) and the flue gas treatment device (5).

3. The energy-saving device for the boiler air intake system according to claim 1, characterized in that, A first demister (211) is provided between the primary air fan (21) and the air-cooled tower (4). A second demister (221) is provided between the secondary air fan (22) and the air-cooled tower (4). The first demister (211) and the second demister (221) are respectively connected to the air-cooled tower (4) to form a loop.

4. The energy-saving device for the boiler air intake system according to claim 1, characterized in that, The primary air blower (21) is connected to the first air heater (6) via a valve; The secondary air blower (22) is connected to the second air heater (7) via a valve.

5. The energy-saving device for the boiler air intake system according to claim 4, characterized in that, A first temperature sensor (100) is installed on the pipeline between the air preheater (2) and the primary air fan (21). A second temperature sensor (200) is provided between the air preheater (2) and the secondary air fan (22). The first temperature sensor (100), the second temperature sensor (200), the first heater (6), the second heater (7), and the valves connected to the primary fan (21) and the secondary fan (22) are all electrically connected to the controller (8).

6. The energy-saving device for the boiler air intake system according to claim 3, characterized in that, The first demister (211) includes a horizontally arranged housing (2111), and a partition (2112) is arranged inside the housing (2111) along the horizontal direction. The partition (2112) divides the interior of the shell (2111) into an upper demisting zone and a lower liquid storage zone. The partition (2112) has multiple through holes that connect the demisting zone and the liquid storage zone. The demisting zone is equipped with a demisting net (2113), and the liquid storage zone is connected to the air-cooled tower (4).

7. The energy-saving device for the boiler air intake system according to claim 2, characterized in that, The flue gas treatment device (5) includes a dust collector (51), a desulfurization tower (52) and an exhaust chimney (53) connected in series.

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