Gasification burner for high pressure on-line ignition and control method thereof

Abstract

The application provides a gasification burner for high-pressure online ignition and a control method thereof, comprising a burner center pipe, a burner inner pipe, a burner intermediate pipe, a burner outer pipe and an igniter; fuel gas is introduced into the burner center pipe, oxygen is introduced into the burner inner pipe, when a coal powder system fails or an instrument malfunctions or an operator misoperates, etc., the medium in the burner intermediate pipe and the burner outer pipe is withdrawn at the same time, fuel gas is introduced into the burner center pipe, the fuel gas in the burner center pipe and the oxygen in the burner inner pipe are ignited by the igniter, the internal environment parameters of the gasification furnace are obtained, if the environment parameters are greater than preset values, the gas types in the burner inner pipe and the burner intermediate pipe are controlled, when the internal environment of the gasification furnace is abnormal, online high-pressure online ignition is realized, production interruption is avoided, and the problems that the service life of the existing burner is short and the burner cannot be ignited immediately under online high-temperature and high-pressure conditions are solved.

Description

Technical Field

[0001] This application relates to the field of coal chemical technology, and in particular to a gasification burner for high-pressure online ignition and its control method. Background Technology

[0002] Currently, coal gasification technology is one of the main ways to achieve clean and efficient utilization of coal. Fluidized bed dry pulverized coal gasification technology, in particular, has been widely promoted and applied due to its advantages such as large throughput per unit volume, high carbon conversion rate, high gasification intensity, energy saving, and environmental protection. The core equipment of dry pulverized coal gasification technology is the gasifier, and the pulverized coal burner is the core component of the gasifier. The performance and lifespan of this equipment directly affect the effective conduct of normal reactions within the gasifier, the quality of the gasification process products, and its long-term stable operation.

[0003] Although extensive research has been conducted on gasifier burners both domestically and internationally, several issues remain to be addressed. For example, during normal gasifier operation, the ignition burner (start-up burner) is stopped after the process burners are put into use. When instrument fluctuations, operator errors, or pulverized coal system fluctuations occur, leading to emergency shutdowns and pressure releases, ignition, heating, and pressurization must be resumed after troubleshooting. Only after system preheating can gas be supplied downstream. This process, excluding troubleshooting time, consumes a significant amount of time. Furthermore, all syngas is burned in the flare during this period. Simultaneously, the temperature within the system changes during gasifier depressurization and pressurization, causing scale to easily detach from the inner walls of equipment and pipelines, severely impacting the long-term operation of the gasifier. Continuous use of the ignition burner, however, results in a shorter lifespan due to high-temperature erosion of the burner head. Ignition burner lifespan is a crucial factor limiting the long-term operation of the gasifier. Furthermore, continuous use of the ignition burner converts some of the ignition fuel gas into ineffective CO2, increasing energy consumption and impacting production efficiency.

[0004] Therefore, it is necessary to design a burner that has a long service life and can ignite immediately under high pressure and high temperature when problems occur in the production process, so as to ensure the production cycle and further improve production efficiency. Summary of the Invention

[0005] This application provides a gasification burner for high-pressure online ignition and its control method to solve the problem that existing burners have a short service life and cannot ignite immediately under high temperature and high pressure conditions.

[0006] On the one hand, this application provides a gasification burner for high-pressure online ignition, comprising: a burner center tube, a burner inner tube, a burner intermediate tube, a burner outer tube, and an igniter;

[0007] Both the inner tube and the outer tube of the burner are provided with water cooling jackets.

[0008] The burner center tube, burner inner tube, burner intermediate tube, and burner outer tube are connected sequentially from the inside to the outside via coaxial nesting.

[0009] The diameter of the outlet end of the inner tube of the burner is slightly smaller than the diameter of the inlet end of the inner tube of the burner, and the diameter of the outlet end of the outer tube of the burner is slightly smaller than the diameter of the inlet end of the outer tube of the burner.

[0010] The igniter is located at the outlet end of the burner center tube;

[0011] The inlet end of the burner center tube is connected to a gas input pipe and a protective gas input pipe, respectively;

[0012] The outlet end of the burner center tube is located inside the burner inner tube;

[0013] The inlet end of the burner inner tube is connected to the first oxygen input tube;

[0014] The inlet end of the burner intermediate tube is connected to the second oxygen input tube;

[0015] The inlet end of the burner outer tube is connected to the pulverized coal input pipe;

[0016] Optionally, the diameter of the outlet end of the burner inner tube is slightly smaller than the diameter of the inlet end of the burner inner tube, and the diameter of the outlet end of the burner outer tube is slightly smaller than the diameter of the inlet end of the burner outer tube.

[0017] Optionally, a strong swirling shroud is provided at the outlet end of the burner intermediate tube.

[0018] On the other hand, this application provides a control method for a gasification burner used for high-pressure online ignition, comprising the following steps:

[0019] Fuel gas is introduced into the central tube of the burner, and oxygen is introduced into the inner tube of the burner.

[0020] The fuel gas in the burner center tube and the oxygen in the burner inner tube are ignited by an igniter to obtain the internal environmental parameters of the gasifier, which include first-stage parameters and second-stage parameters.

[0021] The parameters for the first stage include: flame monitoring and flame video (temperature);

[0022] The parameters for the second stage include: gasifier temperature and pressure;

[0023] Determine whether the environmental parameter is greater than a preset value;

[0024] If the environmental parameters exceed the preset value, oxygen is introduced into the burner's intermediate tube, and pulverized coal is introduced into the burner's outer tube. Then, fuel gas is stopped from being introduced into the burner's central tube, and protective gas is introduced into the burner's central tube to maintain a constant oxygen flow rate in the burner's inner tube.

[0025] It also includes the following steps:

[0026] Acquire the gasifier's operating status information; the operating status information includes normal and abnormal conditions.

[0027] If the working status information is abnormal, stop supplying oxygen to the burner middle tube, stop supplying pulverized coal to the burner outer tube, and simultaneously stop supplying protective gas to the burner center tube, while supplying fuel gas to the burner center tube.

[0028] The fuel gas in the center tube of the burner and the oxygen in the inner tube of the burner are ignited by an igniter.

[0029] As can be seen from the above technical solutions, this application provides a gasification burner for high-pressure online ignition and its control method, including a burner center tube, a burner inner tube, a burner intermediate tube, a burner outer tube, and an igniter; this application introduces fuel gas into the burner center tube and oxygen into the burner inner tube, and ignites the fuel gas in the burner center tube and the oxygen in the burner inner tube using the igniter to obtain the internal environmental parameters of the gasifier. If the environmental parameters are greater than a preset value, the gasifier begins to heat up and pressurize to reach normal operating conditions; after introducing oxygen into the burner intermediate tube and pulverized coal into the burner outer tube, and after the gasifier is operating normally, oxygen is continuously introduced into the burner inner tube (the oxygen does not exit), the introduction of fuel gas into the burner center tube is stopped, and a protective gas is introduced into the burner center tube. When a pulverized coal system malfunctions, instrument fluctuations occur, or operator error causes the medium to exit the burner's intermediate and outer tubes, fuel gas is simultaneously introduced into the burner's central tube while the supply of protective gas to the central tube is stopped. An igniter then ignites the fuel gas in the central tube and the oxygen in the inner tube of the burner, acquiring the gasifier's internal environmental parameters. If these parameters exceed a preset value (or if they do not exceed the preset value within a specified time), the gasification safety protection shutdown system is triggered, stopping the supply of oxygen and fuel gas to the inner and central tubes of the burner, and introducing protective gas into the central tube. By controlling the types of gas in the inner and intermediate tubes of the burner, online ignition is achieved to prevent production interruptions when the gasifier experiences an abnormal shutdown, thus addressing the problem of existing burners having short lifespans and being unable to ignite immediately under high temperature and high pressure conditions. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a gasification burner used for high-pressure online ignition;

[0032] Figure 2 This is a cross-sectional schematic diagram of the vortex shield described in this application;

[0033] Figure 3 This is a schematic diagram illustrating the operation of the control method for the gasification burner used for high-pressure online ignition as described in this application.

[0034] Among them, 1-burner center tube, 2-burner inner tube, 3-burner middle tube, 4-burner outer tube, 5-igniter. Detailed Implementation

[0035] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0036] This application provides a gasification burner for high-pressure online ignition, comprising: a burner center tube 1, a burner inner tube 2, a burner intermediate tube 3, a burner outer tube 4, and an igniter 5;

[0037] Both the inner tube 2 and the outer tube 4 of the burner are provided with water cooling jackets.

[0038] Among them, the burner center tube 1, burner inner tube 2, burner intermediate tube 3 and burner outer tube 4 are arranged from the inside to the outside.

[0039] Connect sequentially via coaxial nesting;

[0040] The igniter 5 is located at the outlet end of the burner center tube 1;

[0041] The inlet end of the burner center tube 1 is connected to a gas input pipe and a protective gas input pipe, respectively;

[0042] The outlet end of the burner center tube 1 is located inside the burner inner tube 2;

[0043] The inlet end of the burner inner tube 2 is connected to the first oxygen input tube;

[0044] The inlet end of the burner intermediate tube 3 is connected to the second oxygen input tube;

[0045] The inlet end of the burner outer tube 4 is connected to the pulverized coal input pipe.

[0046] When ignition is required, fuel gas is introduced into the burner center tube 1. Once ignition is successful and the gasifier's feeding (coal feeding) operation is stable, protective gas is introduced into the burner center tube 1. After the protective gas is introduced into the burner center tube 1, the start-up burner (ignition burner) is extinguished. Because the outlet ends of the burner center tube 1 and the burner inner tube 2 are located inside the burner intermediate tube, and protective gas and oxygen are continuously introduced, it can effectively prevent the burner center tube 1 and the burner inner tube 2 from being eroded, thus avoiding affecting their service life.

[0047] Oxygen is continuously supplied into the inner tube 2 of the burner. When ignition is required, the fuel gas in the central tube 1 of the burner mixes with the oxygen in the inner tube 2 of the burner, which can be ignited immediately, thus avoiding production stoppage due to failure to ignite and affecting production efficiency.

[0048] The diameter of the outlet end of the inner tube 2 of the burner is slightly smaller than the diameter of the inlet end of the inner tube 2 of the burner. More specifically, it provides a certain output angle for the oxygen passing through the inner tube 2 of the burner, so that the oxygen output from the inner tube 2 of the burner can contact and mix fully with the fuel gas in the central tube of the burner, which is convenient for ignition. At the same time, the outlet angle of the inner tube 2 of the burner is very small. The middle tube 3 of the burner is equipped with a strong swirl shroud. After the fuel gas in the central tube 1 of the burner is discharged online, the oxygen in the inner tube 2 of the burner couples with the oxygen in the middle tube 3 of the burner, and fully contacts, mixes and burns with the pulverized coal in the outer tube 4 of the burner with an inward inclination angle, thereby improving efficiency. Online high-pressure ignition involves simultaneously introducing fuel gas into the burner center tube while the oxygen in the burner center tube 3 and the pulverized coal in the burner outer tube 4 are discharged from the gasifier, and the protective gas in the burner center tube 1 is shut off. At the same time, the igniter 5 is activated. After high-pressure online ignition, the internal environmental parameters of the gasifier are within preset values ​​(5-15 seconds). Oxygen is continuously introduced into the gasifier volume through the burner inner tube 2, maintaining a safe oxygen concentration far below the explosion limit. Furthermore, normal combustion in the gasifier occurs in an oxygen-deficient environment of 50%-65%. Within a predetermined time, the oxygen introduced through the burner inner tube 2 reacts with carbon monoxide in the gasifier to produce carbon dioxide. Simultaneously, the gasifier temperature remains above 1300℃, ensuring absolute safety within the predetermined time. This enhances the safety factor of ignition and ensures smooth production.

[0049] The diameter of the outlet end of the inner tube 2 of the burner is slightly smaller than the diameter of the inlet end of the inner tube 2 of the burner. More specifically, it provides a certain output angle for the oxygen passing through the inner tube 2 of the burner, so that the oxygen output from the inner tube 2 of the burner can contact and mix fully with the fuel gas in the central tube 1 of the burner, which facilitates ignition. At the same time, the outlet angle of the inner tube 2 of the burner is very small. The middle tube 3 of the burner is equipped with a strong swirl shroud. After the fuel gas in the central tube 1 of the burner is discharged online, the oxygen in the inner tube 2 of the burner couples with the oxygen in the middle tube 3 of the burner, and fully contacts, mixes and burns with the pulverized coal in the outer tube 3 of the burner with an inward inclination angle, thereby improving efficiency. Online high-pressure ignition involves simultaneously introducing fuel gas into the burner center tube 1 while the oxygen in the burner center tube 3 and the pulverized coal in the burner outer tube 4 are discharged from the gasifier, and the protective gas in the burner center tube 1 is shut down. At the same time, the igniter 5 is activated. After high-pressure online ignition, the internal environmental parameters of the gasifier are within preset values ​​(5-15 seconds). Oxygen is continuously introduced into the gasifier volume through the burner inner tube 2, maintaining a safe oxygen concentration far below the explosion limit. Furthermore, the gasifier operates in a 50%-65% oxygen-deficient environment during normal combustion. Within a predetermined time, the oxygen introduced through the burner inner tube 2 reacts with carbon monoxide in the gasifier to produce carbon dioxide. Simultaneously, the gasifier temperature remains above 1300℃, ensuring absolute safety within the predetermined time. This enhances the safety factor of ignition and guarantees smooth production.

[0050] The diameter of the outlet end of the burner outer tube 4 is smaller than the diameter of the inlet end of the burner outer tube 4. This facilitates uniform material mixing, allowing the reaction to proceed more fully, while also effectively preventing the high-temperature flame from burning the water-cooled wall of the gasifier. This improves production efficiency.

[0051] Furthermore, a swirl shield is provided at the outlet end of the burner intermediate tube 3. The structure of the swirl shield is as follows: Figure 2 As shown, this can increase the intensity of oxygen disturbance inside the burner inner tube 2, making the reaction more complete and improving the carbon conversion rate.

[0052] On the other hand, this application provides a control method for a gasification burner used for high-pressure online ignition, comprising the following steps:

[0053] S1: Fuel gas is introduced into the central tube of the burner, and oxygen is introduced into the inner tube of the burner;

[0054] S2: The fuel gas in the burner center tube and the oxygen in the burner inner tube are ignited by the igniter to obtain the internal environmental parameters of the gasifier, which include the first stage parameters and the second stage parameters.

[0055] The parameters for the first stage include: flame monitoring and flame video (temperature);

[0056] The parameters for the second stage include: gasifier temperature and pressure;

[0057] S3: Determine whether the environmental parameter is greater than a preset value;

[0058] S4: If the environmental parameters are greater than the preset values ​​and the pressure and temperature rise to the predetermined values, oxygen is introduced into the burner intermediate tube, and coal powder is introduced into the burner outer tube. Then, fuel gas is stopped from being introduced into the burner center tube, and protective gas is introduced into the burner center tube, and the burner is in normal operation.

[0059] It also includes the following steps:

[0060] Acquire the gasifier's operating status information; the operating status information includes normal and abnormal conditions.

[0061] If the working status information is abnormal, stop supplying oxygen to the burner middle tube, stop supplying pulverized coal to the burner outer tube, and simultaneously stop supplying protective gas to the burner center tube, while supplying fuel gas to the burner center tube.

[0062] The fuel gas in the center tube of the burner and the oxygen in the inner tube of the burner are ignited by an igniter.

[0063] As can be seen from the above technical solutions, this application provides a gasification burner for high-pressure online ignition and its control method, including a burner center tube, a burner inner tube, a burner intermediate tube, a burner outer tube, and an igniter; this application introduces fuel gas into the burner center tube and oxygen into the burner inner tube, and ignites the fuel gas in the burner center tube and the oxygen in the burner inner tube using the igniter to obtain the internal environmental parameters of the gasifier. If the environmental parameters are greater than a preset value, the gasifier begins to heat up and pressurize to reach normal operating conditions; after introducing oxygen into the burner intermediate tube and pulverized coal into the burner outer tube, protective gas is introduced into the burner center tube, the introduction of fuel gas into the burner center tube is stopped, and oxygen is continuously introduced into the burner inner tube (the oxygen does not exit). When a pulverized coal system malfunctions, instrument fluctuations occur, or operator error causes the medium to exit the burner's intermediate and outer tubes, fuel gas is simultaneously introduced into the burner's central tube, while the supply of protective gas to the central tube is stopped. An igniter then ignites the fuel gas in the central tube and the oxygen in the inner tube of the burner, acquiring the gasifier's internal environmental parameters. If these parameters exceed a preset value (or if they do not exceed a preset value within a specified time, the gasification safety protection shutdown system is triggered, stopping the supply of oxygen and fuel gas to the inner and central tubes of the burner, and introducing protective gas into the central tube), the gas types in the inner and intermediate tubes of the burner are controlled. This allows for online ignition to prevent production interruptions when the gasifier experiences an abnormal shutdown, addressing the problem of short burner lifespan and inability to ignite immediately under high temperature and pressure conditions.

[0064] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A control method for a gasification burner used for high-pressure online ignition, characterized in that, Fuel gas is introduced into the burner center tube (1), and oxygen is introduced into the burner inner tube (2); The fuel gas in the burner center tube (1) and the oxygen in the burner inner tube (2) are ignited by an igniter to obtain the internal environmental parameters of the gasifier, which include first-stage parameters and second-stage parameters. The parameters for the first stage include: flame monitoring and flame temperature; The parameters for the second stage include: gasifier temperature and pressure; Determine whether the environmental parameter is greater than a preset value; If the environmental parameters are greater than the preset value, oxygen is introduced into the burner middle tube (3), coal powder is introduced into the burner outer tube (4), fuel gas is stopped from being introduced into the burner center tube (1), and protective gas is introduced into the burner center tube (1) to maintain a constant oxygen flow rate in the burner inner tube (2). The control method further includes the following steps: Acquire the gasifier's operating status information; the operating status information includes normal and abnormal conditions. If the working status information is abnormal, stop supplying oxygen to the burner middle tube (3), stop supplying coal powder to the burner outer tube (4), and at the same time stop supplying protective gas to the burner center tube (1) and supply fuel gas to the burner center tube (1). The fuel gas in the burner center tube (1) and the oxygen in the burner inner tube (2) are ignited by an igniter. The gasification burner includes: a burner center tube (1), a burner inner tube (2), a burner intermediate tube (3), a burner outer tube (4), and an igniter (5). Both the inner tube (2) and the outer tube (4) of the burner are provided with water cooling jackets; The burner center tube (1), the burner inner tube (2), the burner intermediate tube (3), and the burner outer tube (4) are connected sequentially from the inside to the outside through coaxial nesting. The diameter of the outlet end of the burner inner tube (2) is slightly smaller than the diameter of the inlet end of the burner inner tube (2). The diameter of the outlet end of the outer tube (4) is slightly smaller than the diameter of the inlet end of the burner outer tube (4); The igniter (5) is located at the outlet end of the burner center tube (1); The inlet end of the burner center tube (1) is connected to a gas input pipe and a protective gas input pipe, respectively; The outlet end of the burner center tube (1) is located inside the burner inner tube (2); The inlet end of the burner inner tube (2) is connected to the first oxygen input tube; The inlet end of the burner intermediate tube (3) is connected to the second oxygen input tube; The inlet end of the burner outer tube (4) is connected to the pulverized coal input pipe.

2. The control method according to claim 1, characterized in that, The outlet end of the burner intermediate tube (3) is equipped with a strong vortex shroud.

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