CFB boiler not prone to slagging

Abstract

The utility model relates to the technical field of CFB (circulating fluid bed) boilers, in particular to a non-slagging CFB boiler which comprises a boiler body, a batching mechanism is arranged on the boiler body and comprises a mounting box and a fixing box, the fixing box is mounted on one side of the boiler body, a T-shaped groove is formed in the top end of one side of the fixing box, and the T-shaped groove is communicated with the boiler body. A T-shaped groove is formed in the top end of the boiler body, a T-shaped block is arranged at one end of the mounting box, the T-shaped block abuts against the T-shaped groove, a feeding port is formed between the T-shaped groove and the boiler body, and a feeding pipe and a sealing box are arranged at the top end of the mounting box; the proportion is set by the two batching mechanisms according to personnel, and additives for alkali metal reaction are uniformly conveyed, so that the condition of alkali metal slag bonding is avoided, and therefore, the equipment has the advantage of difficulty in slag bonding, and is particularly suitable for blending combustion in thermoelectric enterprises.

Description

Technical Field

[0001] The utility model relates to the technical field of CFB boilers, in particular to a CFB boiler which is not prone to slagging. Background Art

[0002] As we all know, CFB boiler is the abbreviation of circulating fluidized bed boiler, which is an advanced coal-fired or biomass-fired boiler technology. Its working principle is to use fluidization technology to mix fuel particles with a certain proportion of inert particles (such as sand or quartz sand) to form a boiling-like fluidized state in the furnace for combustion.

[0003] The physical and chemical properties of biomass, solid waste, etc. are quite different from those of coal. Although they can form differentiated complementarity with coal, the combustion conditions in the boiler will change significantly after adding biomass and solid waste. In particular, when the proportion of biomass, solid waste, etc. is high, it will affect the stability of the combustion temperature field in the boiler. The ash produced by the combustion of biomass, solid waste, etc. contains a large amount of alkali metals and alkaline earth metals. Their volatilization will cause ash and slagging on the heating surface of the boiler, affecting the overall efficiency and service life of the boiler. Therefore, it is necessary to propose a solution to this technical problem. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a CFB boiler which is not prone to slagging.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a CFB boiler that is not easy to slag, comprising a boiler body, a batching mechanism on the boiler body, the batching mechanism comprising an installation box and a fixed box, the fixed box is installed on one side of the boiler body, a T-shaped slot is provided on the top of one side of the fixed box, a T-shaped block is provided at one end of the installation box, the T-shaped block is against the T-shaped slot, a feed port is provided between the T-shaped slot and the boiler body, a conveying cavity is provided between the interior of the installation box and one end of the T-shaped block, a spiral conveying device is provided between the installation box and the conveying cavity, a feed pipe and a sealing box are provided at the top of the installation box, a lifting groove is provided between the bottom end of the sealing box and the conveying cavity, a sealing plate is provided on the lifting groove, the sealing plate is adapted to the conveying cavity, a telescopic mechanism is provided at the top of the sealing box, the output end of the telescopic mechanism is connected to the sealing plate, and the batching mechanism is provided with two.

[0008] Furthermore, the utility model is improved in that the spiral conveying device includes a driving motor and a spiral shaft, the spiral shaft is located in the conveying chamber, the driving motor is installed at one end of the installation box, the output end of the driving motor is connected to the spiral shaft, and the spiral shaft is provided with spiral blades.

[0009] Furthermore, the utility model is improved in that the driving motor is a servo motor.

[0010] Furthermore, the utility model is improved in that the telescopic mechanism is a hydraulic rod.

[0011] Furthermore, the utility model is improved in that a feed hopper is provided at the top end of the feed pipe.

[0012] Furthermore, the utility model is improved in that the feed hopper is threadedly connected to the feed pipe.

[0013] Furthermore, the utility model is improved in that a dividing inclined groove is provided on one side of the bottom end of the sealing plate.

[0014] Furthermore, the utility model is improved in that the outer surfaces of the fixing box and the installation box are coated with a ceramic coating.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a CFB boiler that is not prone to slagging, and has the following beneficial effects:

[0017] In the CFB boiler which is not prone to slagging, a desulfurizer is poured into the feed pipe of one of the two batching mechanisms, and an alkali metal capture agent or a modified additive is poured into the feed pipe of the other batching mechanism. The additives that react with alkali metals are uniformly transported according to the ratio set by personnel through the two batching mechanisms, and alkali metal slagging will not occur. Therefore, the patented equipment has the advantage of not being prone to slagging, and is particularly suitable for co-firing in thermal power enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0020] Figure 3 For this utility model Figure 1 A half-section front view of the enlarged structure of the middle installation box;

[0021] Figure 4 For this utility model Figure 1 Left half section view of the enlarged structure of the middle installation box.

[0022] In the figure: 1. boiler body; 2. installation box; 3. fixing box; 4. T-shaped block; 5. feed port; 6. conveying chamber; 7. feed pipe; 8. sealing box; 9. sealing plate; 10. telescopic mechanism; 11. driving motor; 12. screw shaft; 13. screw blade; 14. feed hopper. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-4The utility model is a CFB boiler that is not easy to slag, comprising a boiler body 1, a batching mechanism is arranged on the boiler body 1, and the batching mechanism comprises an installation box 2 and a fixed box 3, the fixed box 3 is installed on one side of the boiler body 1, a T-shaped slot is provided on the top of one side of the fixed box 3, a T-shaped block 4 is provided at one end of the installation box 2, the T-shaped block 4 is against the T-shaped slot, a feed port 5 is provided between the T-shaped slot and the boiler body 1, a conveying cavity 6 is provided between the interior of the installation box 2 and one end of the T-shaped block 4, a spiral conveying device is provided between the installation box 2 and the conveying cavity 6, a feed pipe 7 and a sealing box 8 are provided at the top of the installation box 2, a lifting groove is provided between the bottom end of the sealing box 8 and the conveying cavity 6, a sealing plate 9 is provided on the lifting groove, the sealing plate 9 is adapted to the conveying cavity 6, a telescopic mechanism 10 is provided at the top of the sealing box 8, and the output end of the telescopic mechanism 10 is connected to the sealing plate 9, the batching mechanism has two, in this embodiment , combustible solid waste and combustible biomass are burned through the boiler body 1. When a desulfurizer, alkali metal capture agent or modifying additive needs to be added, the desulfurizer is poured into the feed pipe 7 of one of the two batching mechanisms, and then the sealing plate 9 is moved upward by the telescopic mechanism 10, and the sealing plate 9 leaves the conveying chamber 6, and then a spiral conveying device is used to evenly convey the desulfurizer to the boiler body 1, and at the same time, the alkali metal capture agent or modifying additive is poured into the feed pipe 7 of the other batching mechanism, and then the sealing plate 9 is moved upward by the telescopic mechanism 10, and the sealing plate 9 leaves the conveying chamber 6, and then a spiral conveying device is used to evenly convey the desulfurizer, alkali metal capture agent or modifying additive into the boiler body 1, the desulfurizer, alkali metal capture agent or modifying additive can react with the alkali metal oxide, and the alkali metal slag will not occur, thereby ensuring the stable operation and efficient heat transfer of the boiler, and the problem of alkali metal slag can be solved efficiently and accurately by setting the proportion of the two batching mechanisms according to the personnel and evenly conveying the additives that react with the alkali metal.

[0025] In this solution, the screw conveying device includes a driving motor 11 and a screw shaft 12. The screw shaft 12 is located in the conveying chamber 6. The driving motor 11 is installed at one end of the installation box 2. The output end of the driving motor 11 is connected to the screw shaft 12. The screw shaft 12 is provided with a spiral blade 13. The output end of the driving motor 11 is controlled to drive the screw shaft 12 to rotate, and the screw shaft 12 drives the spiral blade 13 to rotate, so that the material can be evenly conveyed from the feed port 5 into the boiler body 1, and stable and uniform material conveying can be achieved.

[0026] In this solution, the driving motor 11 is a servo motor, which has the characteristic of high rotation accuracy, thereby improving the accuracy of uniformly conveying materials.

[0027] In the present solution, the telescopic mechanism 10 is a hydraulic rod, which has the characteristics of high precision and high reliability, so that the sealing plate 9 can be moved linearly stably and reliably.

[0028] In this solution, a feed hopper 14 is provided at the top of the feed pipe 7, and the feed hopper 14 facilitates the pouring of materials, thereby reducing the possibility of materials spilling to the outside.

[0029] In this solution, the feed hopper 14 is threadedly connected to the feed pipe 7. By threading the feed hopper 14 to the feed pipe 7, it is convenient for personnel to disassemble the feed hopper 14 according to needs.

[0030] In this solution, a dividing chute is provided on one side of the bottom end of the sealing plate 9 , through which the dividing chute can contact and push the material to the side of the sealing plate 9 when the sealing plate 9 moves downward, thereby reducing the material clamped by the sealing plate 9 .

[0031] In this solution, the outer surfaces of the fixing box 3 and the installation box 2 are coated with a ceramic coating, which has excellent thermal insulation effects, thereby improving the thermal insulation and high temperature resistance of the fixing box 3 and the installation box 2.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CFB boiler that is not prone to slagging, comprising a boiler body (1), wherein a batching mechanism is provided on the boiler body (1), characterized in that: The batching mechanism comprises an installation box (2) and a fixed box (3), the fixed box (3) being installed on one side of the boiler body (1), a T-shaped slot being provided at the top of one side of the fixed box (3), a T-shaped block (4) being provided at one end of the installation box (2), the T-shaped block (4) being abutted against the T-shaped slot, a feed port (5) being provided between the T-shaped slot and the boiler body (1), a conveying cavity (6) being provided between the interior of the installation box (2) and one end of the T-shaped block (4), the installation box ( 2) and the conveying chamber (6); a screw conveying device is provided between the installation box (2); a feeding pipe (7) and a sealing box (8) are provided at the top end of the installation box (2); a lifting groove is provided between the bottom end of the sealing box (8) and the conveying chamber (6); a sealing plate (9) is provided on the lifting groove; the sealing plate (9) is adapted to the conveying chamber (6); a telescopic mechanism (10) is provided at the top end of the sealing box (8); the output end of the telescopic mechanism (10) is connected to the sealing plate (9); and two batching mechanisms are provided.

2. The CFB boiler that is not prone to slagging according to claim 1, characterized in that: The screw conveying device comprises a drive motor (11) and a screw shaft (12); the screw shaft (12) is located in the conveying chamber (6); the drive motor (11) is mounted on one end of the mounting box (2); the output end of the drive motor (11) is connected to the screw shaft (12); and the screw shaft (12) is provided with a screw blade (13).

3. The CFB boiler that is not prone to slagging according to claim 2, characterized in that: The driving motor (11) is a servo motor.

4. The CFB boiler that is not prone to slagging according to claim 3, characterized in that: The telescopic mechanism (10) is a hydraulic rod.

5. The CFB boiler that is not prone to slagging according to claim 4, characterized in that: A feeding hopper (14) is provided at the top end of the feeding pipe (7).

6. The CFB boiler that is not prone to slagging according to claim 5, characterized in that: The feed hopper (14) is threadedly connected to the feed pipe (7).

7. The CFB boiler that is not prone to slagging according to claim 6, characterized in that: A dividing inclined groove is provided on one side of the bottom end of the sealing plate (9).

8. The CFB boiler that is not prone to slagging according to claim 7, characterized in that: The outer surfaces of the fixing box (3) and the installation box (2) are both coated with a ceramic coating.

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