Impinging stream coal deep combustion device

Abstract

The utility model relates to an impinging stream deep coal combustion device which comprises a vertically arranged furnace body, the lower end of the furnace body is a primary air inlet, the upper end of the furnace body is a flue gas outlet of the furnace body, and at least one layer of first air pipe and at least one layer of second air pipe are arranged on the upper portion of a fluidized bed of a gasification furnace. Secondary air is injected into the circulating fluidized bed boiler through the first air pipe and the second air pipe, so that the secondary air clockwise rotates in the middle of the circulating fluidized bed boiler and anticlockwise rotates in the middle of the circulating fluidized bed boiler, and both the first air pipe and the second air pipe extend into a hearth of the fluidized bed. By means of layered air distribution of the first air pipe and the second air pipe in the furnace body, secondary air in the fluidized bed pipe body rotates, layered impact of oxygen and carbon can be achieved, deep combustion of coal is achieved, meanwhile, large-particle carbon can be prevented from rising and falling into the fluidized bed for secondary combustion, and the combustion efficiency is improved. The combustion depth of the particles in the boiler hearth is further improved, and the using effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of circulating fluidized bed, more specifically, the utility model relates to a kind of impinging stream coal depth combustion device. BACKGROUND

[0002] Fluidized bed is a kind of reactor using secondary air or liquid to pass through granular solid layer to make solid particles in suspended motion state, and carry out gas-solid phase reaction process or liquid-solid phase reaction process;

[0003] The Chinese patent with patent application number CN201921550460.6 discloses a fluidized bed, which is provided with a sieve plate at the discharge port, and the size and shape of the sieve plate correspond to the opening of the discharge port. A first drainage plate is arranged above the sieve plate, and the side edge of the first drainage plate is fixedly connected with the inner wall of the fluidized bed body and is inclined upward at an angle with the horizontal direction. The structure is simple, convenient to implement, and the material is screened in the fluidized bed, reducing the use of other screening equipment and making the material not exposed to the air during screening. The drainage plate also improves the screening and discharging rate. However, as can be seen from the drawings in the specification, the mesh plate arranged at the bottom of the inner cavity can support the particles and make them suspended by the secondary air. However, this design may cause the particles to be discharged without complete combustion when the secondary air volume and speed are large, resulting in waste.

[0004] Therefore, it is urgent to develop a combustion device that can achieve deep combustion. UTILITY MODEL CONTENT

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides an impinging stream coal depth combustion device to solve the problems raised in the above background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an impinging stream coal depth combustion device, including a vertically arranged furnace body, the lower end of the furnace body is a primary air inlet, the upper end of the furnace body is a flue gas outlet of the furnace body, the upper part of the gasification furnace boiling bed has at least one layer of first air pipe and at least one layer of second air pipe, the secondary air can be injected into the interior of the furnace body through the first air pipe, so that the secondary air rotates clockwise in the middle part of the furnace body, the secondary air can be injected into the interior of the furnace body through the second air pipe, so that the secondary air rotates counterclockwise in the middle part of the furnace body, the first air pipe and the second air pipe both extend into the hearth of the fluidized bed, and the part of the first air pipe and the second air pipe that extends into the hearth can block the upward movement of large particles in the interior of the furnace body.

[0007] Further, the number of first air pipes in each layer is at least three, and the number of second air pipes in each layer is at least three.

[0008] Further, the first air pipes and the second air pipes of each layer are coaxially arranged.

[0009] Further, the first air pipes and the second air pipes of each layer are coaxially arranged.

[0010] Further, the first air pipes and the second air pipes of each layer are coaxially arranged.

[0011] Further, the first air pipes and the second air pipes of each layer are coaxially arranged.

[0012] Further, the first air pipes and the second air pipes of each layer are coaxially arranged.

[0013] Technical effects and advantages of the present application:

[0014] The present application can inject secondary air into the fluidized bed pipe body through the cooperation of the first air pipe and the second air pipe, and make the secondary air generate multiple layers of clockwise air layer and counterclockwise air layer, so that the secondary air in the fluidized bed pipe body rotates, and the oxygen and carbon layers can be separated and collided by moving the oxygen in the primary air pipe to the side of the air outlet pipe, deep combustion can be realized, the particle rising rate can be reduced, the combustion depth of the particles in the boiler furnace can be further improved, and the use effect can be improved.

[0015] The present application can inject secondary air into the fluidized bed pipe body through the cooperation of the first air pipe and the second air pipe, and make the secondary air generate multiple layers of clockwise air layer and counterclockwise air layer, so that the secondary air in the fluidized bed pipe body rotates, and the oxygen and carbon layers can be separated and collided by moving the oxygen in the primary air pipe to the side of the air outlet pipe, deep combustion can be realized, the particle rising rate can be reduced, the combustion depth of the particles in the boiler furnace can be further improved, and the use effect can be improved.

[0016] In summary, through the mutual influence of the above-mentioned multiple effects, the particle rising rate can be reduced, the oxygen and carbon layers can be collided, and deep combustion can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole schematic view of the present application.

[0018] Figure 2 It is a structure schematic view of the impingement flow coal deep combustion device of the present application.

[0019] Figure 3 It is a front view structure schematic view of the present application.

[0020] Figure 4 It is the overhead section structure schematic view of the connection of the second air pipe and the pipe body of the combustion device.

[0021] Figure 5 It is the side view partial section structure schematic view of the utility model.

[0022] The reference signs are: 1, fluidized bed furnace body; 2, first air pipe; 3, second air pipe; 4, coal conveying pipeline; 5, air outlet pipe; 6, primary air pipe. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] As shown in the accompanying drawings Figures 1-5The embodiment of the application is a kind of impingement flow coal deep combustion device, which comprises a vertical furnace body, the lower end of the furnace body is a primary air inlet, the upper end of the furnace body is a flue gas outlet, the upper part of the fluidized bed of the furnace body is provided with a coal conveying pipeline 4 for conveying coal powder, and the coal conveying pipeline 4 is connected with a coal conveying machine. The upper part of the coal conveying pipeline 4 is provided with at least one layer of first air pipes 2 and at least one layer of second air pipes 3, the number of each layer of first air pipes 2 is at least three, and the secondary air can be injected into the interior of the furnace body through the first air pipes 2, so that the secondary air rotates clockwise in the middle part of the furnace body. In the embodiment, the number of each layer of first air pipes 2 is three. The effect of the rotation of the entering secondary air can be improved, the occurrence of dead angles or uneven air flow in the furnace can be avoided, and the coverage range of the secondary air in the furnace can be ensured. The number of each layer of second air pipes 3 is at least three, and the secondary air can be injected into the interior of the circulating fluidized bed boiler through the second air pipes 3, so that the secondary air rotates counterclockwise in the middle part of the circulating fluidized bed boiler. The first air pipes 2 and the second air pipes 3 all penetrate into the furnace of the fluidized bed, and the part of the first air pipes 2 and the second air pipes 3 penetrating into the furnace can block the large particles of carbon rising into the interior of the circulating fluidized bed boiler, but the central region of the cross section of the furnace is a non-blocking region. Specifically, in the process of rising along the mixed air of the primary air and the secondary air, the large particles will fall back to the fluidized bed for secondary combustion reaction due to their own weight, and in the process of rising along the mixed air of the primary air and the secondary air, the small particles of carbon can collide with the first air pipes 2 or the second air pipes 3, the collision causes the small particles of carbon to break into smaller particles of carbon, increases the contact area of the solid carbon and the flue gas, makes the combustion more sufficient, prolongs the rising time of the particles of carbon, makes the reaction time longer, and the combustion more sufficient, and avoids the large particles rising from the interior of the gas outlet pipe 5. The circulating fluidized bed boiler of the application makes the large particles deeply combust in the furnace of the boiler, and does not need a cyclone separator and a return device, so that the deep combustion can be realized.

[0025] As a preferred embodiment of the above embodiment, each layer of first air pipes 2 is fixedly connected with the circulating fluidized bed boiler in a tangential direction clockwise, and the secondary air input into the interior of the circulating fluidized bed boiler through the first air pipes 2 rotates clockwise in the interior of the circulating fluidized bed boiler. Each layer of second air pipes 3 is fixedly connected with the circulating fluidized bed boiler in a tangential direction counterclockwise, and the secondary air input into the interior of the circulating fluidized bed boiler through the second air pipes 3 rotates counterclockwise in the interior of the circulating fluidized bed boiler, and in combination with the secondary air input through the first air pipes 2, the large particles of carbon in the interior of the circulating fluidized bed boiler can be located close to the edge of the inner cavity of the circulating fluidized bed boiler due to the centrifugal force, and the small particles of carbon can be located in the center of the inner cavity of the circulating fluidized bed boiler due to the centrifugal force, so that the large particles in the small particles of carbon can be blocked again by the first air pipes 2 or the second air pipes 3, return to the fluidized bed for combustion; or the large particles in the small particles of carbon can be broken by the first air pipes 2 or the second air pipes 3, and react again in the process of rising.

[0026] As a preferred embodiment of the above, the diameters of the first air pipes 2 and the second air pipes 3 are the same, which can ensure that the secondary air uniformly enters the furnace interior from the several first air pipes 2 / second air pipes 3, facilitate to maintain the uniform distribution of the secondary air in the furnace, promote the effective reaction of the secondary air and the carbon, and improve the combustion efficiency.

[0027] As a preferred embodiment of the above, the first air pipes 2 of each layer are coaxially arranged, and the second air pipes 3 of each layer are coaxially arranged, which can effectively stabilize the combustion process, maintain the stable air volume and air flow velocity, reduce the air flow fluctuation, increase the stability of the circulating fluidized bed boiler, promote the effective reaction of the secondary air and the carbon, improve the combustion efficiency, and ensure the normal operation of the boiler.

[0028] As a preferred embodiment of the above, the first air pipes 2 and the second air pipes 3 of the adjacent two layers are staggered in the circumferential direction, which can make the secondary air more uniformly enter the furnace of the circulating fluidized bed boiler, optimize the combustion environment, improve the thermal efficiency and combustion stability, promote the flow of the secondary air in the furnace, help to form more stable and dense combustion air flow, improve the combustion effect; meanwhile, the introduced secondary air can be well rotated to produce more uniform air flow distribution in the fluidized bed boiler; and it is beneficial to ensure that the pulverized coal is fully mixed with oxygen to improve the combustion efficiency and full combustion.

[0029] As a preferred embodiment of the above, the multiple layers of the first air pipes 2 and the multiple layers of the second air pipes 3 are staggered and spaced in the middle part of the circulating fluidized bed boiler, which can make the internal part of the circulating fluidized bed boiler produce multiple layers of rotating air layers. The rotation of the secondary air can also reduce the ascending rate of the particles, thereby improving the combustion depth of the large particles in the furnace of the boiler.

[0030] The chemical reaction of the secondary air, the primary air and the coal in the furnace is as follows:

[0031] C+O2→CO2, O2+H2→H2O

[0032] The working principle of the utility model is as follows: in use, the secondary air is injected into the internal part of the circulating fluidized bed boiler through the first air pipes 2 and the second air pipes 3, the coal is injected into the internal part of the circulating fluidized bed boiler through the coal conveying pipeline 4, the primary air and the particle coal entering the internal part of the circulating fluidized bed boiler through the primary air pipe 6 will gradually move to one side of the air outlet pipe 5; meanwhile, the secondary air injected into the internal part of the circulating fluidized bed boiler through the first air pipes 2 and the second air pipes 3 will rotate clockwise and counterclockwise in the internal part of the circulating fluidized bed boiler, the large particle carbon will be located around the internal cavity of the circulating fluidized bed boiler and block the particle ascending through the first air pipes 2 / second air pipes 3 in the process of ascending of the large particle carbon following the mixed air of the primary air and the secondary air, and return to the boiling bed combustion, thereby the large particle can be deeply combusted, and the oxygen and the carbon are layered impacted by changing the air direction of each layer to realize the deep combustion and improve the full combustion effect.

[0033] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coal deep burn impinging stream apparatus characterized by: The application relates to a gasification boiler, which comprises a vertically arranged furnace body (1), the lower end of the furnace body (1) being a primary air inlet, the upper end of the furnace body (1) being a flue gas outlet of the furnace body (1), the upper part of the gasification boiler boiling bed having at least one layer of first air pipes (2) and at least one layer of second air pipes (3), the second air pipes (3) being used to inject secondary air into the interior of the furnace body (1) to make the secondary air rotate clockwise in the middle part of the furnace body (1), the first air pipes (2) being used to inject secondary air into the interior of the furnace body (1) to make the secondary air rotate counterclockwise in the middle part of the furnace body (1), the first air pipes (2) and the second air pipes (3) extending into the furnace hearth of the fluidized bed, and the parts of the first air pipes (2) and the second air pipes (3) extending into the furnace hearth being used to block the rising of large particles in the interior of the furnace body (1).

2. Impinging stream coal deep combustion device according to claim 1, characterized in that: The number of the first air pipes (2) of each layer is at least three, and the number of the second air pipes (3) of each layer is at least three.

3. The impinging stream coal deep burning device of claim 1, wherein: The first air pipes (2) and the second air pipes (3) are staggered and spaced in the middle part of the fluidized bed furnace body (1).

4. The impinging stream coal deep burning apparatus according to claim 1, characterized by: The first air pipes (2) and the second air pipes (3) of adjacent two layers are staggered in the circumferential direction.

5. The impinging stream coal deep burning device of claim 1, wherein: The diameters of the first air pipes (2) and the second air pipes (3) are the same.

6. The impinging stream coal deep burning device of claim 1, wherein: The first air pipes (2) of each layer are coaxially arranged, and the second air pipes (3) of each layer are coaxially arranged.

7. The impinging stream coal deep burning device of claim 1, wherein: Each layer of the first air pipes (2) is fixedly connected with the fluidized bed furnace body (1) in the tangential direction clockwise, and each layer of the second air pipes (3) is fixedly connected with the fluidized bed furnace body (1) in the tangential direction counterclockwise.

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