Combustor special for blending combustion of industrial byproduct gas in circulating fluidized bed boiler

Abstract

The utility model relates to the technical field of combustors, in particular to a combustor special for blending combustion of industrial by-product gas of a circulating fluidized bed boiler, which comprises a hearth, a combustion chamber is communicated with the upper end of the hearth and connected with the hearth through 56 steel pipes, a combustor access port is connected with the side end of the combustion chamber, the combustion chamber is communicated with an air duct, and the air duct is communicated with the combustor. According to the device, the burner adopts the Venturi negative pressure adsorption principle, by-product gas is sucked by negative pressure at a throat opening, the by-product gas collides with the air at the relative speed, and the by-product gas is sucked into the burner at the throat opening of the burner, so that the by-product gas and the air are separated from each other, and the by-product gas and the air are separated from each other. The mixing is more ideal and more thorough, the amount of raw coal entering the boiler is reduced, fly ash abrasion and scouring are reduced, the service life of the boiler is prolonged, the gas flow of a hearth of the burner is increased, the gas flow speed is increased, the solid particle concentration is reduced, the relative movement of high-temperature flue gas and coal particles is enhanced, and the coal particles are combusted more fully.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a burner specially used for mixing and burning industrial by-product gas in a circulating fluidized bed boiler. Background Art

[0002] Circulating fluidized bed boilers have the advantages of good combustion suitability, high combustion efficiency, low gas pollutant emissions, large load adjustment range, and comprehensive utilization of fly ash and slag. Traditional fluidized beds simply use low calorific value coal as fuel. However, the chemical system produces a large amount of by-product gas. Due to its low calorific value and unstable gas source, it is impossible to establish an independent combustion system. The factory directly sends it to the flare system for air combustion or directly discharges it into the atmosphere, which not only causes serious air pollution, but also wastes resources. In order to make full use of the heat of this part of the waste gas, turn waste into treasure, reduce pollutant emissions, save energy for enterprises, reduce the operating costs of enterprises, and protect the environment, it is used as a power fuel and put into the boiler for blending, thereby achieving energy conservation and emission reduction. After blending, the boiler operates well and achieves good economic and social benefits.

[0003] Traditional burners only study the supply of a single combustible fuel, but pay less attention to the organic waste gas with complex and variable components. Due to the special structure of the circulating fluidized bed, direct injection into the furnace is likely to cause coking and pipe bursting, affecting the safe and stable operation of the system. A burner dedicated to the mixing of industrial by-product gas in circulating fluidized bed boilers is needed to solve this problem. Utility Model Content

[0004] The purpose of the utility model is to provide a burner specially used for the co-firing of industrial by-product gas in a circulating fluidized bed boiler, so as to solve the problem of resource waste and environmental pollution caused by the inability to establish an independent combustion system to participate in auxiliary combustion due to the low calorific value of the exhaust gas and the unstable gas source. Through reasonable structural design, the combustion air and the by-product gas are completely mixed and fully burned, which greatly saves the coal burning ratio, and through a reasonable combustion structure, the emission of NOx is controlled within a reasonable range. After the circulating fluidized bed boiler is co-fired with the by-product gas, a fixed proportion of organic waste gas and pulverized coal will be combined, further improving the operating conditions of the circulating fluidized bed and improving the thermal efficiency of the boiler. Co-firing as a new skill has broadened the fuel application types of fluidized bed boilers and provided new ideas and methods for optimizing boiler operation and utilizing exhaust gas.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a burner specially used for the combustion of industrial by-product gas in a circulating fluidized bed boiler, comprising a furnace, the upper end of the furnace is connected to a combustion chamber, the combustion chamber and the furnace are connected by 56 steel pipes, the side end of the combustion chamber is connected to a burner access port, the combustion chamber is connected to an air duct, 56 air duct sleeves are connected to the air duct, the air duct is supplied through the gap between the air duct sleeve and the gas pipe, and a nozzle is installed on the end of the gas pipe.

[0006] As a preferred technical solution of the utility model, an air inlet is provided at the top of the air duct, the air inlet is connected to the air duct, the air duct is connected to the gas channel, the gas channel has a fuel gas inlet, and the side end of the air duct is connected to an air duct.

[0007] As a preferred technical solution of the utility model, a fire detector is installed at one end of the air duct, and the fire detector is connected to the air duct.

[0008] As a preferred technical solution of the utility model, a fixed pipe is installed on the air duct, and an embedded part is installed on the fixed pipe.

[0009] As a preferred technical solution of the utility model, a connecting flange is installed on the fixed pipe, and the connecting flange and the fixed pipe are connected by threads.

[0010] As a preferred technical solution of the present utility model, the nozzle and the air duct sleeve are made of high temperature resistant stainless steel 310s.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] (1) The utility model is a burner specially used for the combustion of industrial by-product gas in a circulating fluidized bed boiler. The burner of the device adopts the Venturi negative pressure adsorption principle. The by-product gas is sucked in by negative pressure at the throat and the relative speed is used to make the by-product gas collide with the air, making the mixing more ideal and thorough, reducing the amount of raw coal entering the furnace, reducing the wear and scouring of fly ash, and increasing the service life of the boiler.

[0013] (2) The utility model is a burner specially used for the combustion of industrial by-product gas in a circulating fluidized bed boiler. The burner furnace gas flow rate is increased, the gas flow rate is increased, the solid particle concentration is reduced, and the relative movement of high-temperature flue gas and coal particles is strengthened, so that the coal particles burn more completely. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 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 work.

[0015] Figure 1 It is a structural schematic diagram of a burner specially used for mixing industrial by-product gas with a circulating fluidized bed boiler according to an embodiment of the utility model;

[0016] Figure 2 The utility model is a structural schematic diagram of the installation position of a burner specially used for the mixed combustion of industrial by-product gas in a circulating fluidized bed boiler according to an embodiment of the utility model.

[0017] Reference numerals:

[0018] 1. Air duct; 2. Gas pipe; 3. Air channel; 4. Gas channel; 5. Fire detection; 6. Air duct casing; 7. Connecting flange; 8. Fixed pipe; 9. Nozzle; 10. Air inlet; 11. Fuel gas inlet; 13. Burner access port; 14. Steel pipe; 15. Combustion chamber; 16. Furnace. DETAILED DESCRIPTION

[0019] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0020] Example 1

[0021] See also Figure 1 to Figure 2 Embodiment 1 is described, comprising a furnace 16, the upper end of the furnace 16 is connected to a combustion chamber 15, the combustion chamber 15 and the furnace 16 are connected by 56 steel pipes 14, the side end of the combustion chamber 15 is connected to a burner access port 13, the combustion chamber 15 is connected to an air duct 3, 56 air duct sleeves 6 are connected to the air duct 3, the air is fed into the gap between the air duct sleeve 6 and the gas pipe 2, a nozzle 9 is installed on the end of the gas pipe 2, the static pressure at the diffusion point of the nozzle 9 is converted into kinetic energy, reaching supersonic speed, a connecting flange 7 is installed on the fixed pipe 8, the connecting flange 7 and the fixed pipe 8 are threadedly connected, and the nozzle 9 and the air duct sleeve 6 are made of high temperature resistant stainless steel 310s;

[0022] In this embodiment, the steel pipe 14 is provided to connect the furnace 16 and the fuel chamber 15 to achieve graded transportation of the fuel, and the combustion-supporting air is provided by the secondary air.

[0023] Example 2

[0024] See also Figure 1Example 2 is described. This embodiment further describes Example 1, including an air inlet 10 at the top of the air duct 3, the air inlet 10 is connected to the air duct 3, the air duct 3 is connected to the gas channel 4, the gas channel 4 is provided with a fuel gas inlet 11, the side end of the air duct 3 is connected to the air duct 1, one end of the air duct 1 is equipped with a fire detector 5, the fire detector 5 is connected to the air duct 1, the air duct 1 is equipped with a fixed pipe 8, and the fixed pipe 8 is equipped with an embedded part;

[0025] In this embodiment, the set fire detection can monitor the combustion conditions in the furnace in real time.

[0026] In specific applications, the device first allows the by-product gas with a certain pressure to enter the premixing section through the fuel gas inlet 11, and connects the furnace 16 and the fuel chamber 15 through 56 C45x4 steel pipes 14 to achieve graded fuel transportation. The combustion-supporting air is provided by the secondary air and enters the air duct 3 through the air port. The air duct is connected to 56 air duct sleeves 6. The combustion-supporting air is supplied from the gap between the air duct sleeve 6 and the gas pipe 2 and reaches the end of the gas pipe 2. The end of the gas pipe 2 adopts a Venturi nozzle 9. The by-product gas with a certain pressure reaches the speed of sound when passing through the throat of the Venturi nozzle 9. When it reaches the diffusion part of the nozzle 9, the static pressure is converted into kinetic energy and reaches supersonic speed. At the same time, a vacuum is formed at the throat, and the combustion-supporting air is sucked into the gas pipeline by negative pressure under the action of the pressure difference. It mixes with the fuel gas while entering the mixing section, and then is ejected from the venturi tube divergence port at a subsonic speed to achieve mixing. In order to prevent local high temperature and destroy fluidization, cooling secondary air is arranged on the upper part of the burner to quickly take out the heat of the by-product gas combustion. The burner of this device adopts semi-premixed combustion technology. Through special structural design, the gas passes through the annular jet and the air jet to form strong shear, stretching and stirring. The gas is mixed very evenly within a distance of 100-200mm from the outlet. Therefore, the combustion is safe and the combustion efficiency is above 99.5%. High-intensity combustion can be achieved, the flame outlet injection speed is high, the flame rigidity is strong, the combustion is stable, and there will be no backfire. It can operate normally within the design load range of 40%-110%.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top end", "bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A burner specially used for mixing industrial by-product gas with a circulating fluidized bed boiler, characterized in that: The invention comprises a furnace (16), the upper end of the furnace (16) is connected to a combustion chamber (15), the combustion chamber (15) and the furnace (16) are connected via 56 steel pipes (14), the side end of the combustion chamber (15) is connected to a burner access port (13), the combustion chamber (15) is connected to an air duct (3), 56 air duct sleeves (6) are connected to the air duct (3), gas is supplied through a gap between the air duct sleeves (6) and a gas pipe (2), and a nozzle (9) is installed at the end of the gas pipe (2).

2. A burner specially used for mixing industrial by-product gas in a circulating fluidized bed boiler according to claim 1, characterized in that: The top of the air duct (3) is provided with an air inlet (10), the air inlet (10) is connected to the air duct (3), the air duct (3) is connected to the gas channel (4), the gas channel (4) is provided with a fuel gas inlet (11), and the side end of the air duct (3) is connected to the air pipe (1).

3. A burner specially used for mixing industrial by-product gas in a circulating fluidized bed boiler according to claim 2, characterized in that: A fire detector (5) is installed at one end of the air duct (1), and the fire detector (5) is connected to the air duct (1).

4. The burner specially used for mixing industrial by-product gas in a circulating fluidized bed boiler according to claim 2 is characterized in that: A fixed pipe (8) is installed on the air duct (1), and an embedded part is installed on the fixed pipe (8).

5. A burner specially used for mixing industrial by-product gas with a circulating fluidized bed boiler according to claim 4, characterized in that: A connecting flange (7) is installed on the fixed pipe (8), and the connecting flange (7) and the fixed pipe (8) are connected by threads.

6. The burner specially used for mixing industrial by-product gas in a circulating fluidized bed boiler according to claim 1, characterized in that: The nozzle (9) and the air duct sleeve (6) are made of high temperature resistant stainless steel 310s.

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