Preheating burner of coal water slurry gasification furnace

Abstract

The utility model belongs to the technical field of preheating burners of gasification furnaces, and relates to a preheating burner of a coal water slurry gasification furnace, which comprises a preheating burner shell arranged on the gasification furnace, and an air pipe, a central fuel gas pipe and a main fuel gas pipe which penetrate through the preheating burner shell, extend into the gasification furnace and are sequentially sleeved from inside to outside, and the air pipe is communicated with the preheating burner shell. Compared with the prior art, the three-way pipe is arranged at the pipe opening of the central fuel gas pipe, and the air pipe is inserted into the central fuel gas pipe through the three-way pipe. Due to the arrangement of the air pipes, air is introduced into the preheating burner through the air pipe on the innermost side and the air pipe on the outermost side, fuel gas is introduced into the middle sleeve, an existing air-fuel gas external mixing mode is changed into an air-fuel gas internal and external mixing mode, and sufficient mixing of the air and the fuel gas is facilitated; the air pipe is arranged, so that the fluctuation of air quantity in the gasifier can be reduced, and insufficient combustion of fuel gas or frequent flameout of a preheating burner can be avoided; the air pipe is arranged, so that the loss of heat in the gasifier can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of preheating burners for gasification furnaces and relates to a preheating burner for a water-coal slurry gasification furnace. Background Art

[0002] The preheating burner of the gasifier is used for the mixed combustion of fuel gas and air. After the gasifier is heated to about 900°C, the water-coal slurry can be stably ignited after entering the gasifier, and then the water-coal slurry can be quickly and stably burned after entering the gasifier to generate high-efficiency gas.

[0003] The existing preheating burner of the gasifier is mainly composed of a main fuel gas pipe, a secondary fuel gas pipe, an air pipe, a pilot light tube, an ignition gun structure, etc. The main fuel gas pipe and the secondary fuel gas pipe are connected to the natural gas pipeline, and one end of the air pipe is connected to the atmosphere. The fuel gas is sent into the gasifier through the fuel gas pipe, and the air enters the gasifier through the air pipe by pumping negative pressure. After the two media are mixed, the fuel gas sent into the center pipe is ignited by the ignition gun to generate a high-temperature flame. The flame heat heats the gasifier through conduction, radiation, convection and other heat transfer methods. The shortcomings are: the existing preheating burner of the gasifier is difficult to ignite, easy to extinguish, the fuel gas and air are unevenly mixed, and the combustion is incomplete.

[0004] The burner usage analysis is as follows:

[0005] 1) Long ignition time: The main reason is the imbalance of the ratio of air to fuel gas. During ignition, the amount of fuel gas is very small, and the slight fluctuation of negative pressure causes an imbalance of the ratio of fuel to air inside the gasifier, making ignition difficult.

[0006] 2) Frequent flameouts: The main factors are unstable flames and insufficient air in the gasifier. During the furnace drying process, in order to ensure that the heating rate is maintained at a certain rate, the negative pressure in the gasifier must be maintained at a certain level. The fluctuation of negative pressure affects the amount of air in the furnace. When the fuel gas is constant, the air in the gasifier decreases, which will cause flameout.

[0007] 3) Incomplete combustion of fuel gas (impure flame color): The main reason is that there is insufficient air in the gasifier, the fuel gas cannot be completely burned, the preheating burner temperature will be low, and the heating speed will be slow. Summary of the invention

[0008] The utility model aims to provide a water-coal slurry gasifier preheating burner, which is used to solve the problems of difficult ignition, easy flameout, uneven mixing of fuel gas and air, and incomplete combustion of the gasifier preheating burner.

[0009] The purpose of the utility model can be achieved through the following technical solutions:

[0010] A preheating burner for a water-coal slurry gasifier comprises a preheating burner shell arranged on the gasifier, an air duct which passes through the preheating burner shell and extends into the gasifier and is sequentially sleeved from the inside to the outside, a central fuel gas pipe, a main fuel gas pipe, and an air pipe connected to the preheating burner shell.

[0011] The utility model adds an air duct channel for introducing combustion aids such as factory wind to the central fuel channel, changing the original single fuel gas and air external mixing type to a new type of external mixing and internal mixing. After the transformation, the preheating burner can save about 22 cubic meters of fuel gas per hour and about 2 cubic meters of steam per hour, with significant energy-saving effects. At the same time, after the transformation, ignition is easier, the flameout will not occur due to normal steam fluctuations, the combustion is more complete, and the oven drying time is shorter.

[0012] Furthermore, the air duct is connected to the air supply fan, and the preheating burner shell is connected to the negative pressure exhaust device.

[0013] Furthermore, a tee is provided at the end of the central fuel gas pipe, the air duct passes through two interfaces of the tee and extends into the central fuel gas pipe, and a central fuel gas pipe joint is provided at the other interface of the tee.

[0014] Furthermore, a main fuel gas pipe joint is provided on the side wall of the main fuel gas pipe.

[0015] Furthermore, an air duct joint is provided on the air duct.

[0016] Furthermore, the air duct extends to 120-180 mm from the end of the central fuel pipe.

[0017] Furthermore, a porous plate is provided at the end of the air duct extending into the gasifier, which is conducive to the full mixing of air and fuel gas, so that the fuel gas can be burned more fully in the furnace.

[0018] Furthermore, the aperture of the holes in the porous plate is 1-3 mm.

[0019] Furthermore, the preheating burner shell is also provided with a permanent lamp extending into the gasification furnace.

[0020] Furthermore, the preheating burner shell is also provided with at least one of a flame detection port, an instrument air inlet, an ignition gun interface or a fire viewing hole.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model arranges a three-way pipe at the mouth of the central fuel gas pipe, and inserts the air pipe into the central fuel pipe through the three-way pipe. The air pipe arrangement allows the preheating burner to introduce air through the innermost air pipe and the outermost air pipe, and introduces fuel gas through the middle sleeve, thereby changing the existing air-fuel gas external mixing type to an air-fuel gas internal and external mixing type, which is conducive to the full mixing of air and fuel gas;

[0023] At the same time, the setting of the air duct changes the existing control method of increasing the air content in the gasifier by pumping negative pressure to control through the air duct, especially the factory air duct, which can reduce the fluctuation of the air volume in the gasifier caused by the fluctuation of negative pressure, thereby avoiding the problem of insufficient combustion of fuel gas or frequent flameout of the preheating burner of the gasifier;

[0024] In addition, the setting of the air duct can reduce the circulation of air in the gasification furnace due to the negative pressure extraction, reduce the heat loss in the furnace, and the porous plate set at the end of the air duct can fully mix the fuel gas and factory air. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a preheating burner of a water-coal slurry gasification furnace in the utility model;

[0026] Figure 2 It is a schematic diagram of the structure of a porous plate;

[0027] Description of the markings in the figure:

[0028] 1-main fuel gas pipe, 2-main fuel gas pipe joint, 3-center fuel gas pipe, 4-center fuel gas pipe joint, 5-tee pipe, 6-air duct, 7-air duct joint, 8-preheating burner shell, 9-porous plate, 10-plate hole, 11-long-lasting lamp tube, 12-flame detection port, 13-instrument air inlet, 14-ignition gun interface, 15-fire viewing hole, 16-air pipe. DETAILED DESCRIPTION

[0029] The following embodiments are implemented based on the above technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following embodiments.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] Example

[0033] like Figure 1 The water-coal slurry gasification furnace preheating burner shown includes a preheating burner shell 8 arranged on the gasifier, an air duct 6 extending through the preheating burner shell 8 into the gasifier and sequentially arranged from the inside to the outside, a central fuel gas pipe 3, a main fuel gas pipe 1, and an air pipe 16 connected to the preheating burner shell 8.

[0034] In some specific embodiments, the air duct 6 is a factory air duct. The air duct 6 can be connected to the blower, and the preheating burner housing 8 is connected to the negative pressure exhaust device.

[0035] In some specific embodiments, a tee pipe 5 is provided at the end of the central fuel gas pipe 3, an air duct 6 passes through two interfaces of the tee pipe 5 and extends into the central fuel gas pipe 3, and a central fuel gas pipe joint 4 is provided at the other interface of the tee pipe 5.

[0036] In some specific embodiments, a main fuel gas pipe connector 2 is provided on the side wall of the main fuel gas pipe 1 .

[0037] In some specific embodiments, the air duct 6 is further provided with an air duct joint 7 .

[0038] In some specific embodiments, the air duct 6 extends to 120-180 mm from the end of the central fuel pipe, and the preferred distance is 150 mm.

[0039] In some specific embodiments, a porous plate 9 is provided at the end of the air duct 6 extending into the gasifier. The porous plate is provided to facilitate the full mixing of air and fuel gas, thereby making the fuel gas burn more fully in the furnace. Figure 2 As shown, the diameter of the plate holes 10 opened on the porous plate 9 is 1-3 mm, and more preferably the diameter is 2 mm.

[0040] In some specific embodiments, the preheating burner shell 8 is further provided with a permanent lamp tube 11 extending into the gasification furnace.

[0041] In some specific embodiments, the preheating burner housing 8 is further provided with at least one of a flame detection port 12 , an instrument air inlet 13 , an ignition gun interface 14 or a fire viewing hole 15 .

[0042] The working principle of this embodiment is as follows:

[0043] The setting of the tee of the central fuel gas pipe 3 can insert the air duct 6 into the central fuel gas pipe 3. The setting of the air duct 6 changes the existing air-fuel gas from an external mixing type to an air-fuel gas internal and external mixing type, which is conducive to the full mixing of air and fuel gas; the setting of the air duct 6 changes the existing method of increasing the air content in the gasifier by extracting negative pressure to control through the factory air duct 6, which can reduce the problem of insufficient combustion of fuel gas or frequent flameout of the preheating burner of the gasifier due to negative pressure fluctuations; the setting of the air duct 6 can reduce the circulation of air in the gasifier due to the extraction of negative pressure, thereby reducing the heat loss in the furnace; the porous plate 9 set at the end of the air duct 6 can accelerate the mixing of fuel gas and air.

[0044] It has been calculated that after the transformation, the preheating burner can save about 22 cubic meters of fuel gas per hour and about 2 cubic meters of steam per hour, with significant energy-saving effects. At the same time, after the transformation, ignition is easier, combustion is more complete, and the furnace baking time is shorter.

[0045] The following are specific usage cases, 2# is the original burner data before the modification (air duct 6 is not installed), and 1# is the burner usage record after the modification (air duct 6 is installed).

[0046] Table 1

[0047] Gasifier serial number Ignition time (h) Number of flameouts Cause of flameout Flame Color Fuel gas consumption (m³) Steam consumption (m³) 2# furnace (before transformation) 5.4 14 times 1 steam stop; 13 negative pressure fluctuations Mostly yellow 33614 384.52 1# furnace (after transformation) 0.4 2 times 1 tempering, 1 operation All blue 18554 192.91

[0048] By comparing the data and use process of furnace 1# and furnace 2#, it can be clearly seen that the modified preheating burner solves the problems of difficult ignition, easy flameout, and low temperature caused by insufficient combustion of fuel gas in the original structure burner, and greatly reduces the time and resources required for furnace baking. Statistics show that it takes 478 hours for furnace 2# to bake, while it only takes 263 hours for furnace 1#. It is 215 hours less than furnace 2#. This improvement has played an important role in improving production preparation efficiency and reducing risk factors.

[0049] In addition, each unit saves an average of 15,060 cubic meters of fuel gas and 191.61 cubic meters of steam. Based on the local fuel gas price of 3 yuan / cubic meter and steam price of 183 yuan / cubic meter, each furnace can save 80,244.63 yuan in a single furnace drying process. Based on the 3-month maintenance cycle of the water-coal slurry gasifier, each gasifier can save 320,978.52 yuan in annual furnace drying. These data fully demonstrate that the modified preheating burner has significant advantages in improving efficiency and saving costs.

[0050] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A preheating burner for a water-coal slurry gasifier, characterized in that: It comprises a preheating burner shell (8) arranged on the gasifier, an air duct (6) extending through the preheating burner shell (8) into the gasifier and arranged in sequence from the inside to the outside, a central fuel gas pipe (3), a main fuel gas pipe (1), and an air pipe (16) connected to the preheating burner shell (8).

2. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: The air duct (6) is connected to the air supply fan, and the preheating burner shell (8) is connected to the negative pressure exhaust device.

3. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: A three-way pipe (5) is provided at the end of the central fuel gas pipe (3); the air pipe (6) passes through two interfaces of the three-way pipe (5) and extends into the central fuel gas pipe (3); and a central fuel gas pipe joint (4) is provided at the other interface of the three-way pipe (5).

4. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: A main fuel gas pipe joint (2) is provided on the side wall of the main fuel gas pipe (1).

5. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: The air duct (6) is also provided with an air duct joint (7).

6. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: The air duct (6) extends to 120-180 mm from the end of the central fuel pipe.

7. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: A porous plate (9) is provided at the end pipe opening of the air duct (6) extending into the gasifier.

8. The preheating burner for a water-coal slurry gasifier according to claim 7, characterized in that: The hole diameter of the plate holes (10) on the porous plate (9) is 1-3 mm.

9. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: The preheating burner shell (8) is also provided with a permanent lamp tube (11) extending into the gasification furnace.

10. The preheating burner for a water-coal slurry gasifier according to claim 1, characterized in that: The preheating burner shell (8) is also provided with at least one of a flame detection port (12), an instrument air inlet (13), an ignition gun interface (14) or a fire viewing hole (15).

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