Boiler ash concentration regulating and controlling device

Abstract

The utility model discloses a boiler ash concentration regulating and controlling device which comprises a slag cooler and a boiler connected with a separator through a flue, the bottom end of the separator is connected with a material returning device, a material returning pipe is connected between the material returning device and the boiler, and the two ends of the slag cooler are connected with an ash inlet pipe and an ash outlet pipe respectively. An ash discharging pipe is connected between the ash inlet pipe and the material returning pipe, a first electromagnetic valve and a second electromagnetic valve are installed on the ash discharging pipe, an air adjusting mechanism is arranged at the bottom end of the boiler and comprises a cover plate, and a temperature sensor and a concentration detector are arranged in the cover plate. According to the utility model, the slag cooler, the return feeder, the return pipe, the ash discharge pipe, the electromagnetic valve I, the electromagnetic valve II and the air regulating mechanism are arranged, so that compared with the prior art, the temperature sensor is connected with the electromagnetic valve I, and the concentration detector is connected with the electromagnetic valve II, so that the working balance of the boiler can be automatically maintained, the high load and the low load can be automatically switched, and manual regulation and control are not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a boiler ash concentration control device. Background Art

[0002] Circulating fluidized bed power generation is an important component of thermal power generation. Circulating fluidized bed boilers have the advantages of a wide range of fuel applications and low emissions of original flue gas pollutants. In the actual operation of the boiler, a large amount of return material will increase the boiler ash concentration, which will lead to a low bed temperature, resulting in low combustion efficiency and boiler ash collapse. The existing patent (Announcement No.: CN104990071B) discloses a circulating fluidized bed boiler with adjustable circulating ash flow. The invention uses circulating ash to adjust the load in the boiler, which can control the particle concentration in the boiler and improve the fuel combustion efficiency in the furnace. However, in actual applications, the load in the boiler can only be passively adjusted and the load in the boiler cannot be automatically adjusted, which is not conducive to the continuous operation of the boiler. To this end, we propose a boiler ash concentration control device. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a boiler ash concentration control device.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A boiler ash concentration control device is designed, comprising a slag cooler, a boiler connected to a separator through a flue, a return device connected to the bottom end of the separator, a return pipe connected between the return device and the boiler, an ash inlet pipe and an ash outlet pipe connected to the two ends of the slag cooler respectively, an ash discharge pipe connected between the ash inlet pipe and the return pipe, an electromagnetic valve 1 and an electromagnetic valve 2 are installed on the ash discharge pipe, an air regulating mechanism is provided at the bottom end of the boiler, the air regulating mechanism comprises a cover plate, and a temperature sensor and a concentration detector are provided in the cover plate.

[0006] In the above scheme, a connecting pipe is fixed on the cover plate, a baffle is fixed inside the connecting pipe, air outlets are evenly arranged on the baffle, and shielding sheets are movably arranged on the air outlets.

[0007] In the above solution, adjacent shielding sheets are connected to each other, and the shielding sheets are rotatably connected to the baffle.

[0008] In the above solution, the temperature sensor and the concentration detector are installed on the shielding sheet.

[0009] In the above scheme, a storage bin is provided below the returner, and the storage bin is connected to the returner via an ash discharge pipe, and a valve 1 is installed on the ash discharge pipe.

[0010] In the above scheme, a drainage pipe is obliquely connected between the bottom of the return device and the ash discharge pipe, and an air duct 1 is connected to the drainage pipe.

[0011] In the above scheme, the bottom of the storage bin is connected with a guide pipe, the ash inlet pipe is installed with a second valve, the ash inlet pipe is connected with a tee, the guide pipe and the ash discharge pipe are respectively connected with the tee, and the guide pipe is connected with a second air duct.

[0012] The advantages and beneficial effects of the utility model are as follows: by arranging a slag cooler, a returner, a return pipe and an ash discharge pipe, an electromagnetic valve 1, an electromagnetic valve 2 and an air regulating mechanism, a temperature sensor is used to detect the temperature of the dense phase zone, and then it is judged whether the boiler is under high load or low load. At the same time, a concentration detector is used to detect the circulating ash concentration in the boiler to judge the high or low circulating ash concentration. Compared with the prior art, the temperature sensor is connected to the electromagnetic valve 1, and the concentration detector is connected to the electromagnetic valve 2. When the boiler is under high load and the circulating ash concentration is high, the electromagnetic valve 1 and the electromagnetic valve 2 are opened at the same time to make the ash discharge pipe unobstructed, and then part of the circulating ash in the return pipe flows to the ash discharge pipe, and then the circulating ash enters the slag cooler for cooling. When the boiler is under low load and the circulating ash concentration is low, the electromagnetic valve 1 and the electromagnetic valve 2 are closed at the same time to block the ash discharge pipe, prevent the circulating ash in the return pipe from entering the ash discharge pipe, and make the circulating ash flow into the boiler. The working balance of the boiler can be automatically maintained, and the high and low loads can be automatically switched without manual regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a schematic diagram of the structure of a boiler ash concentration control device proposed by the utility model;

[0015] Figure 2 A schematic diagram of the connection structure of an air duct 1 of a boiler ash concentration control device proposed by the utility model;

[0016] Figure 3 The utility model discloses a structural schematic diagram of an air regulating mechanism of a boiler ash concentration regulating device.

[0017] In the figure: boiler 1, flue 2, separator 3, return device 4, return pipe 5, slag cooler 6, ash inlet pipe 7, ash outlet pipe 8, tee 9, ash discharge pipe 10, solenoid valve 1 11, solenoid valve 2 12, air regulating mechanism 13, cover plate 131, connecting pipe 132, baffle 133, air outlet 134, shielding sheet 135, ash discharge pipe 14, storage bin 15, valve 1 16, air duct 1 17, guide pipe 18, valve 2 19, air duct 2 20, temperature sensor 21, concentration detector 22, drainage pipe 23. DETAILED DESCRIPTION

[0018] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] See also Figure 1-3 The utility model provides a technical solution: a boiler ash concentration control device, comprising a slag cooler 6, a boiler 1 connected to a separator 3 through a flue 2, a return device 4 connected to the bottom end of the separator 3, a return pipe 5 connected between the return device 4 and the boiler 1, the boiler 1 is supported by a wall or a bracket, an ash inlet pipe 7 and an ash outlet pipe 8 are connected to both ends of the slag cooler 6, a downwardly inclined ash discharge pipe 10 is connected between the ash inlet pipe 7 and the return pipe 5, and an electromagnetic valve 11 and an electromagnetic valve 2 12 are sequentially installed on the ash discharge pipe 10, and an air regulating mechanism 13 is provided at the bottom end of the boiler 1, and the air regulating mechanism 13 includes a cover plate 131;

[0020] Further, a connecting pipe 132 is fixed on the cover plate 131, and the connecting pipe 132 is connected to the air duct three for connecting the fan one, so as to let air into the boiler 1. A baffle 133 is fixed in the connecting pipe 132, and air ports 134 are evenly arranged on the baffle 133. The air ports 134 are fan-shaped, and a fan-shaped shielding piece 135 is movably arranged on the air ports 134. The area of ​​the shielding piece 135 is larger than that of the air ports 134. By adjusting the position of the shielding piece 135, the area blocked by the air ports 134 is adjusted, and then the wind force is adjusted to cooperate with the state conversion of the boiler 1.

[0021] The cover plate 131 is provided with a temperature sensor 21 and a concentration detector 22;

[0022] Furthermore, the temperature sensor 21 and the concentration detector 22 are installed inside the shielding sheet 135 so as to detect the temperature of the boiler 1 and the circulating ash concentration;

[0023] Specifically, by setting up a slag cooler 6, a return device 4, a return pipe 5 and an ash discharge pipe 10, a solenoid valve 1 11, a solenoid valve 2 12 and an air regulating mechanism 13, a temperature sensor 21 is used to detect the temperature of the dense phase zone, and then it is determined whether the boiler 1 is in a high load or a low load. At the same time, a concentration detector 22 is used to detect the circulating ash concentration in the boiler 1 to determine the high or low circulating ash concentration. Compared with the prior art, the temperature sensor 21 is connected to the solenoid valve 1 11, and the concentration detector 22 is connected to the solenoid valve 2 12. When the boiler 1 is in a high load and the circulating ash is When the concentration is high, the solenoid valve 11 and the solenoid valve 2 12 are opened at the same time to make the ash discharge pipe 10 unobstructed, so that part of the circulating ash in the return pipe 5 flows to the ash discharge pipe 10, and then the circulating ash enters the slag cooler 6 for cooling. When the boiler 1 is at a low load and the circulating ash concentration is low, the solenoid valve 11 and the solenoid valve 2 12 are closed at the same time to block the ash discharge pipe 10, preventing the circulating ash in the return pipe 5 from entering the ash discharge pipe 10, and allowing the circulating ash to flow into the boiler 1, which can automatically maintain the working balance of the boiler 1 and automatically switch between high and low loads without manual regulation.

[0024] Furthermore, adjacent shielding pieces 135 are connected to each other, and the shielding pieces 135 are rotatably connected to the baffle 133;

[0025] Specifically, Figure 3 As shown, the roots of the shielding piece 135 are interconnected and are formed in an integral manner. The center of the shielding piece 135 is movably connected to the baffle 133 through a rotating shaft. Pulleys are installed on the rotating shaft and the external driving shaft. The pulley on the rotating shaft has a larger radius. The driving shaft is connected to the motor, and the pulleys are connected by belts. The motor is a stepping motor, which drives the pulley and the rotating shaft to rotate through the driving shaft, thereby rotating the shielding piece 135.

[0026] Furthermore, a storage bin 15 is provided below the returner 4, and the storage bin 15 is connected to the returner 4 through an ash discharge pipe 14, and a valve 16 is installed on the ash discharge pipe 14; in practical applications, the storage bin 15 can be used to perform transitional storage of the circulating ash;

[0027] Furthermore, a drainage pipe 23 is obliquely connected between the bottom of the return device 4 and the ash discharge pipe 14, and an air pipe 17 is connected to the drainage pipe 23. The drainage pipe 23 is connected to the ash discharge pipe 14 and the air pipe 17. The air pipe 17 is connected to the external fan 2, so that air flow is introduced into the ash discharge pipe 14, and then the circulating ash in the ash discharge pipe 14 is completely discharged to avoid blockage.

[0028] Furthermore, a guide pipe 18 is connected to the bottom end of the storage bin 15, a valve 2 19 is installed on the ash inlet pipe 7, the ash inlet pipe 7 is connected to a tee 9, the guide pipe 18 and the ash discharge pipe 10 are respectively connected to the tee 9, and the guide pipe 18 is connected to an air duct 20; the air duct 20 is connected to the external fan 3, and air is introduced into the air duct 20, so that the circulating ash in the storage bin 15 flows up through the return device 4 and the return pipe 5 and enters the boiler 1.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A boiler ash concentration control device, comprising a slag cooler (6), a boiler (1) connected to a separator (3) via a flue (2), characterized in that: The bottom end of the separator (3) is connected to a return device (4), a return pipe (5) is connected between the return device (4) and the boiler (1), the two ends of the slag cooler (6) are respectively connected to an ash inlet pipe (7) and an ash outlet pipe (8), an ash discharge pipe (10) is connected between the ash inlet pipe (7) and the return pipe (5), and an electromagnetic valve 1 (11) and an electromagnetic valve 2 (12) are installed on the ash discharge pipe (10), and an air regulating mechanism (13) is provided at the bottom end of the boiler (1), and the air regulating mechanism (13) includes a cover plate (131), and a temperature sensor (21) and a concentration detector (22) are provided inside the cover plate (131).

2. The boiler ash concentration control device according to claim 1, characterized in that: A connecting pipe (132) is fixed on the cover plate (131), a baffle (133) is fixed inside the connecting pipe (132), air outlets (134) are evenly arranged on the baffle (133), and a shielding sheet (135) is movably arranged on the air outlet (134).

3. The boiler ash concentration control device according to claim 2 is characterized in that: Adjacent shielding sheets (135) are connected to each other, and the shielding sheets (135) are rotatably connected to the baffle (133).

4. The boiler ash concentration control device according to claim 2, characterized in that: The temperature sensor (21) and the concentration detector (22) are mounted on the shielding sheet (135).

5. The boiler ash concentration control device according to claim 1, characterized in that: A storage bin (15) is provided below the returner (4), and the storage bin (15) is connected to the returner (4) via an ash discharge pipe (14), and a valve 1 (16) is installed on the ash discharge pipe (14).

6. The boiler ash concentration control device according to claim 5, characterized in that: A drainage pipe (23) is obliquely connected between the bottom of the return device (4) and the ash discharge pipe (14), and an air duct 1 (17) is connected to the drainage pipe (23).

7. The boiler ash concentration control device according to claim 5, characterized in that: The bottom end of the storage bin (15) is connected to a guide pipe (18), the ash inlet pipe (7) is installed with a second valve (19), the ash inlet pipe (7) is connected to a tee (9), the guide pipe (18) and the ash discharge pipe (10) are respectively connected to the tee (9), and the guide pipe (18) is connected to a second air duct (20).

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