A coal-fired boiler voltage stabilizing device

Abstract

The present invention relates to the technical field of coal-fired boiler equipment, and specifically to a coal-fired boiler pressure stabilizing device, comprising an outer shell, an inner shell, a sealing cap and a switching mechanism, wherein the sealing cap is arranged in the outer shell, and the inner shell is movably installed in the outer shell through the switching mechanism, and the switching mechanism is used to drive the inner shell to disconnect from the outer shell and abut against the sealing cap to form a first medium channel; the switching mechanism is also used to drive the inner shell to disconnect from the sealing cap and abut against the outer shell to form a second medium channel; and also includes a pressure measuring piece and a controller, wherein the pressure measuring piece is used to measure the pressure in the outer shell and send the data to the controller, and the controller controls the operation of the switching mechanism. The beneficial effects of the present invention are: the structure is simple, and the bed pressure can be stabilized quickly and efficiently through simple operation.

Description

Technical Field

[0001] The invention relates to the technical field of coal-fired boiler equipment, in particular to a coal-fired boiler pressure stabilizing device. Background Art

[0002] With the improvement of fluidization technology and coal crushing technology, the particle size of coal entering the fluidized bed coal-fired boiler in a thermal power plant is getting smaller and smaller. The fine ash has excellent fluidity at 900°C. The furnace pressure of the fluidized bed coal-fired boiler is slightly positive. Once positive pressure gas flows out of the furnace with the ash and enters the downstream slag cooler equipment, a two-phase fluid will be formed, causing a large amount of ash to instantly flow out of the furnace and enter the slag cooler without cooling and pour into the downstream conveying equipment of the slag cooler. The high-temperature slag will damage the conveying equipment. What is more serious is that the boiler bed pressure drops rapidly and instantly, which has a great impact on the stable operation of the boiler. In severe cases, the boiler has to be suppressed or even shut down, which greatly affects the economic benefits of the power plant.

[0003] Slag flow in fluidized bed boilers is now the norm, and occurs without warning and in a short time. How to quickly and efficiently stabilize the bed pressure and ensure the normal and stable operation of the boiler is a problem. Summary of the invention

[0004] The object of the present invention is to provide a coal-fired boiler pressure stabilizing device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A coal-fired boiler pressure stabilizing device comprises an outer shell, an inner shell, a sealing cap and a switching mechanism, wherein the sealing cap is arranged in the outer shell, and the inner shell is movably installed in the outer shell through the switching mechanism, and the switching mechanism is used to drive the inner shell to disconnect from the outer shell and abut against the sealing cap to form a first medium channel; the switching mechanism is also used to drive the inner shell to disconnect from the sealing cap and abut against the outer shell to form a second medium channel; and also comprises a pressure measuring piece and a controller, wherein the pressure measuring piece is used to measure the pressure in the outer shell and send the data to the controller, and the controller controls the operation of the switching mechanism.

[0007] As a further solution of the present invention: the outer shell is composed of part or all of the straight cylinder, the upper cone cylinder and the lower cone cylinder.

[0008] As a further solution of the present invention: the switching mechanism is arranged on both sides or one side of the outer shell, and is used to drive the inner shell to move, so as to realize the switching between the first medium channel and the second medium channel.

[0009] As a further solution of the present invention: the switching mechanism includes a driving member and a cross bar, the driving member is fixedly mounted on the external mechanism, the driving member is connected to the inner shell body through the cross bar, and the side of the outer shell body is provided with an avoidance hole for the movement of the cross bar.

[0010] As a further solution of the present invention: a sealing member is provided at the avoidance hole for sealing the outer shell.

[0011] As a further solution of the present invention: the driving element is a pneumatic element, a hydraulic element, or an electric element, and the output end of the pneumatic element, the hydraulic element, or the electric element is connected to the cross bar.

[0012] As a further solution of the present invention: the shape of the sealing cap is a conical structure or a flat plate structure.

[0013] As a further solution of the present invention: the pressure measuring piece is a high temperature resistant pressure gauge.

[0014] Compared with the prior art, the present invention has the following beneficial effects: it has a simple structure and can quickly and efficiently stabilize the bed pressure through simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the normal operating state of the pressure stabilizing device for a coal-fired boiler in an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the operating state of the coal-fired boiler pressure stabilizing device during slag flow in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the normal operating state of a coal-fired boiler pressure stabilizing device in an optional embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the operating state of a coal-fired boiler pressure stabilizing device during slag flow in an optional embodiment of the present invention.

[0019] In the accompanying drawings: 1-outer shell, 2-inner shell, 3-sealing cap, 4-switching mechanism, 5-sealing member, 6-cross bar, A-boiler bottom ash. DETAILED DESCRIPTION

[0020] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present embodiment disclosure as detailed in the appended claims.

[0021] See also Figure 1-2 In an embodiment of the present invention, a coal-fired boiler pressure stabilizing device includes an outer shell 1, an inner shell 2, a sealing cap 3 and a switching mechanism 4, wherein the sealing cap 3 is arranged in the outer shell 1, and the inner shell 2 is movably installed in the outer shell 1 through the switching mechanism 4, and the switching mechanism 4 is used to drive the inner shell 2 to disconnect from the outer shell 1 and abut against the sealing cap 3 to form a first medium channel; the switching mechanism 4 is also used to drive the inner shell 2 to disconnect from the sealing cap 3 and abut against the outer shell 1 to form a second medium channel; and also includes a pressure measuring piece and a controller, wherein the pressure measuring piece is used to measure the pressure in the outer shell 1 and send data to the controller, and the controller controls the operation of the switching mechanism 4.

[0022] Specifically, the sealing cap 3 is arranged at the top of the inner cavity of the outer shell 1, and the inner shell 2 is relatively arranged below the sealing cap 3. The inner shell 2 is made of a hollow pipe; the pressure measuring piece is a high temperature resistant pressure gauge, and the high temperature resistant pressure gauge is connected to the controller. Under normal operating conditions, the boiler bottom ash A flows out through the first medium channel, and the pressure measuring device detects the air pressure in the outer shell, and the detected pressure value is not less than the set value; when slag is flowing, when the pressure value detected by the pressure measuring device is less than the set value, the controller controls the switching mechanism 4 to work, driving the inner shell 2 to move downward, the top of the inner shell 2 is disconnected from the bottom of the sealing cap 3, and the bottom of the inner shell 2 abuts against the bottom inner surface of the outer shell 1 to form a second medium channel, and the boiler bottom ash A flows out through the second medium channel. During this process, the boiler bottom ash A accumulates between the inner shell 2 and the outer shell 1 and will not flow away quickly. The air pressure in the outer shell rises. After exceeding the set value, the controller controls the switching mechanism 4 to work, driving the bottom of the inner shell 2 to disconnect from the bottom inner surface of the outer shell 1 and abut against the sealing cap 3 to form the first medium channel. Boiler bottom ash A flows out through the first medium channel. When slag flow occurs in the boiler, the bottom ash of the boiler needs to be accumulated to a certain height first, which takes some time. In this way, a slag seal of a certain height is formed, which quickly buffers the speed and flow rate of the bottom ash outflow, thereby stabilizing the boiler bed pressure and ensuring that the boiler can quickly resume normal operation.

[0023] In an optional embodiment of the present invention, Figure 3-4As shown, the sealing cap 3 is arranged in the lower middle part of the inner cavity of the outer shell 1, and the inner shell 2 is relatively arranged above the sealing cap 3. The switching mechanism 4 is used to drive the inner shell 2 to disconnect from the outer shell 1 and abut against the sealing cap 3 to form a first medium channel; the switching mechanism 4 is also used to drive the inner shell 2 to disconnect from the sealing cap 3 and abut against the outer shell 1 to form a second medium channel. The second medium channel serves as the outflow channel of the boiler bottom ash A under normal operating conditions. Under normal conditions, the boiler bottom ash A flows out through the second medium channel. The pressure measuring piece detects the air pressure in the outer shell. When the detected pressure value is less than the set value, the controller controls the switching mechanism 4 to work, driving the inner shell 2 to move downward, the top end of the inner shell 2 disconnects from the outer shell, and the bottom end of the inner shell 2 abuts against the sealing cap 3 to form a first medium channel, and the boiler bottom ash A flows out through the first medium channel. During this process, the boiler bottom ash A will accumulate in the inner shell 2 and then overflow and flow out, and will not flow away quickly. The air pressure in the outer shell 1 rises. After exceeding the set value, the controller controls the switching mechanism 4 to work, driving the bottom end of the inner shell 2 to disconnect from the sealing cap 3 and abut against the outer shell 1 to form a second medium channel. The boiler bottom ash A flows out through the second medium channel. When slag flow occurs in the boiler, the bottom ash of the boiler needs to be accumulated to a certain height first, which takes some time. In this way, a slag seal of a certain height is formed, which quickly buffers the speed and flow rate of the bottom ash outflow, thereby stabilizing the boiler bed pressure and ensuring that the boiler can quickly resume normal operation.

[0024] See also Figure 1-2 In the embodiment of the present invention, the outer shell 1 is composed of part or all of a straight cylinder, an upper conical cylinder and a lower conical cylinder.

[0025] Specifically, the outer shell 1 is composed of an upper cone, a straight cylinder and a lower cone. Figure 1 As shown, the inner shell is in contact with the sealing cap 3. At this time, there is a gap between the outer surface of the inner shell 2 and the inner surface of the upper cone cylinder, the inner surface of the straight cylinder and the inner surface of the lower cone cylinder. The gap forms a first medium channel. Figure 2 As shown, the inner shell body is disconnected from the sealing cap 3 and abuts against the inner surface of the lower cone cylinder. At this time, a gap is left between the outer surface of the inner shell body 2 and the inner surface of the upper cone cylinder and the inner surface of the straight cylinder, and a gap is left between the sealing cap 3 and the top end of the inner shell body 2 to form a second medium channel.

[0026] Optionally, the outer shell 1 is composed of a straight cylinder and a lower conical cylinder, such as Figure 1 As shown, the inner shell is in contact with the sealing cap 3. At this time, there is a gap between the outer surface of the inner shell 2 and the inner surface of the straight cylinder and the inner surface of the lower cone cylinder. The gap forms a first medium channel. Figure 2As shown, the inner shell is disconnected from the sealing cap 3 and abuts against the inner surface of the lower cone cylinder. At this time, a gap is left between the outer surface of the inner shell 2 and the inner surface of the straight cylinder, and a gap is left between the sealing cap 3 and the top of the inner shell 2 to form a second medium channel. The upper cone cylinder is eliminated, and compared with the outer shell composed of the upper cone cylinder, the straight cylinder and the lower cone cylinder, the structure is simpler and the cost is lower under the same function.

[0027] Similarly, when the sealing cap 3 is arranged below the inner shell, the first medium channel and the second medium channel used in the normal operation state and the slag flow operation state respectively can be obtained through the above-mentioned composition principle and connection method.

[0028] See also Figure 1 In the embodiment of the present invention, the switching mechanism 4 is arranged on both sides or one side of the outer shell 1, and is used to drive the inner shell 2 to move to achieve switching between the first medium channel and the second medium channel.

[0029] Specifically, the switching mechanism 4 is arranged on both sides of the outer shell 1. The two sides of the inner shell 2 are connected by a cross bar, and the cross bar 6 is welded and fixed to the two sides of the inner shell 2. Alternatively, the switching mechanism 4 is arranged on one side of the outer shell 1 to drive the inner shell 2 to move. Since the high-temperature boiler bottom ash A flows in the outer shell 1, when the switching mechanism 4 is connected to the inner shell by one cross bar 6, the switching mechanism 4 will be deformed due to uneven heating in the moving state. Therefore, it is preferred that the switching mechanism 4 is arranged on both sides of the outer shell 1.

[0030] See also Figure 1 In the embodiment of the present invention, the switching mechanism 4 includes a driving member and a cross bar 6. The driving member is fixedly mounted on the external mechanism. The driving member is connected to the inner shell through the cross bar 6. The side of the outer shell is provided with an avoidance hole for the movement of the cross bar 6.

[0031] Specifically, two driving members are arranged on both sides of the outer shell 1, and are connected to the inner shell 2 through the cross bar 6 respectively, and the two driving members synchronously drive the cross bar to move. The cross bar moves in the avoidance hole to drive the inner shell to move up and down, realizing the switching between the first medium channel and the second medium channel.

[0032] Preferably, a sealing member 5 is provided at the avoidance hole for sealing the outer shell 1. The sealing member comprises a sealing shell, a packing seal and a sealing cover. The sealing shell is welded at the avoidance hole. The packing seal is arranged between the cross bar 6 and the inner surface of the sealing shell for sealing the avoidance hole. The sealing cover is installed at one end of the sealing shell away from the avoidance hole for fixing the packing seal. The cross bar 6 passes through the sealing cover and is connected to the driving member.

[0033] See also Figure 1 In an embodiment of the present invention, the driving component is a pneumatic component, a hydraulic component, or an electric component, and the output end of the pneumatic component, the hydraulic component, or the electric component is connected to the cross bar 6.

[0034] Specifically, the driving member is an electric element, specifically an electric push rod. Two electric push rods are arranged on the mounting surfaces on both sides of the outer shell. The output end of the electric push rod is connected to the cross bar. The controller controls the electric push rod to drive the cross bar to move, and then drives the inner shell to move.

[0035] Optionally, the driving member is a pneumatic element, specifically an electric cylinder. Two electric cylinders are arranged on the mounting surfaces on both sides of the outer shell. The output ends of the electric cylinders are connected to the cross bar. The controller controls the electric cylinders to drive the cross bar to move, thereby driving the inner shell to move.

[0036] See also Figure 1-2 In the embodiment of the present invention, the shape of the sealing cap 3 is a conical structure or a flat plate structure.

[0037] Specifically, the sealing cap 3 is in the shape of a flat plate structure and is n-type.

[0038] Optional, such as Figure 3 , 4 In the coal-fired boiler pressure stabilizing device shown in the figure, the sealing cap 3 is in the shape of a conical structure, and the sealing cap 3 of the conical structure abuts against the inner shell, as shown in FIG. Figure 3 As shown, under normal operating conditions, the sealing cap 3 with a conical structure will not accumulate boiler bottom ash A, which is more conducive to the stable operation of the coal-fired boiler pressure stabilizing device shown.

[0039] The working principle of the present invention is: under normal operating conditions, boiler bottom ash A flows out through the first medium channel, and the pressure measuring piece detects the air pressure in the outer shell, and the detected pressure value is not less than the set value; during slag flowing, when the pressure value detected by the pressure measuring piece is less than the set value, the controller controls the switching mechanism 4 to work, driving the inner shell 2 to move downward, the top end of the inner shell 2 disconnects from the contact with the bottom of the sealing cap 3, and the bottom end of the inner shell 2 abuts against the bottom inner surface of the outer shell 1 to form a second medium channel, and the boiler bottom ash A flows out through the second medium channel. During this process, the boiler bottom ash A accumulates between the inner shell 2 and the outer shell 1 and will not flow away quickly. The air pressure in the outer shell rises. After exceeding the set value, the controller controls the switching mechanism 4 to work, driving the bottom end of the inner shell 2 to disconnect from the bottom inner surface of the outer shell 1 and abut against the sealing cap 3 to form the first medium channel.

[0040] It should be noted that the controller, electric push rod and electric cylinder used in the present invention are all applications of existing technologies. Professional technicians in this field can achieve the desired functions according to the relevant description, or achieve the desired technical characteristics through similar technologies, and they will not be described in detail here.

[0041] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the disclosure in the specification and examples. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0042] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A coal-fired boiler voltage stabilizing device, It is characterized in that The invention comprises an outer shell, an inner shell, a sealing cap and a switching mechanism, wherein the sealing cap is arranged in the outer shell, and the inner shell is movably installed in the outer shell through the switching mechanism, and the switching mechanism is used to drive the inner shell to disconnect from the outer shell and abut against the sealing cap to form a first medium channel; the switching mechanism is also used to drive the inner shell to disconnect from the sealing cap and abut against the outer shell to form a second medium channel; the invention also comprises a pressure measuring member and a controller, wherein the pressure measuring member is used to measure the pressure in the outer shell and send the data to the controller, and the controller controls the operation of the switching mechanism, and the switching mechanism comprises a driving member and a cross bar, wherein the driving member is fixedly mounted on an external mechanism, and the driving member is connected to the inner shell through the cross bar, and a side portion of the outer shell is provided with an avoidance hole for the movement of the cross bar, and a sealing member is provided at the avoidance hole for sealing the outer shell, and the sealing member comprises a sealing shell, a packing seal and a sealing cover, wherein the sealing shell is welded at the avoidance hole, the packing seal is arranged between the cross bar and the inner surface of the sealing shell, the sealing cover is arranged at the end of the sealing shell away from the avoidance hole, and the cross bar is provided at the side portion of the outer shell. The rod passes through the sealing cover and is connected to the driving member, and the inner shell is made of a hollow pipe; the pressure measuring piece is a high-temperature resistant pressure gauge, which is connected to the controller. The working process of the coal-fired boiler pressure stabilizing device is as follows: Under normal operating conditions, the boiler bottom ash A flows out through the first medium channel, and the pressure measuring piece detects the air pressure in the outer shell, and the detected pressure value is not less than the set value; when slag is flowing, when the pressure value detected by the pressure measuring piece is less than the set value, the controller controls the switching mechanism to drive the inner shell to move downward, the top of the inner shell is disconnected from the bottom of the sealing cap, and the bottom of the inner shell abuts the inner surface of the bottom of the outer shell to form a second medium channel, and the boiler bottom ash A flows out through the second medium channel. During this process, the boiler bottom ash A accumulates between the inner shell and the outer shell and will not flow away quickly. The air pressure in the outer shell rises. After exceeding the set value, the controller controls the switching mechanism to drive the bottom of the inner shell to disconnect from the inner surface of the bottom of the outer shell and abut the sealing cap to form a first medium channel, and the boiler bottom ash A flows out through the first medium channel.

2. A coal-fired boiler voltage stabilizing device according to claim 1, It is characterized in that The outer shell is composed of a straight cylinder, an upper conical cylinder and a lower conical cylinder.

3. A coal-fired boiler voltage stabilizing device according to claim 1, It is characterized in that The switching mechanism is arranged on both sides or one side of the outer shell, and is used to drive the inner shell to move, so as to realize the switching between the first medium channel and the second medium channel.

4. A coal-fired boiler voltage stabilizing device according to claim 1, It is characterized in that The driving element is a pneumatic element, a hydraulic element or an electric element, and the output end of the pneumatic element, the hydraulic element or the electric element is connected to the cross bar.

5. A coal-fired boiler voltage stabilizing device according to claim 1, It is characterized in that The sealing cap is in the shape of a cone structure or a flat plate structure.

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