CN112457887A - Gasification burner for high-pressure online ignition and control method thereof - Google Patents

Abstract

The application provides a gasification burner for high-pressure online ignition and a control method thereof, wherein the gasification burner comprises a burner central tube, a burner inner tube, a burner intermediate tube, a burner outer tube and an igniter; this application through to the nozzle center tube lets in the fuel gas, to let in oxygen in the nozzle inner tube, when pulverized coal system break down or instrument mistake fluctuation or operating personnel maloperation etc. lead to nozzle intermediate tube and nozzle outer tube medium to withdraw from simultaneously, let in the fuel gas to the nozzle center tube to ignite through the oxygen that some firearm is to the fuel gas that is arranged in the nozzle center tube and the nozzle inner tube, acquire gasifier internal environment parameter, if when environmental parameter is greater than the default, control gaseous kind in nozzle inner tube and the nozzle intermediate tube has realized when the inside unusual parking of gasifier, through online high pressure ignition, avoids production to break off, with the current nozzle life of solution shorter, problem that can't ignite immediately under the online high temperature high pressure condition.

Description

Gasification burner for high-pressure online ignition and control method thereof

Technical Field

The application relates to the technical field of coal chemical industry, in particular to a gasification burner for high-pressure online ignition and a control method thereof.

Background

At present, the coal gasification technology is one of the main approaches for cleaning and efficiently utilizing coal, and the entrained flow bed dry coal powder gasification technology is widely popularized and applied due to the advantages of large unit volume handling capacity, high carbon conversion rate, high gasification strength, energy conservation, environmental protection and the like. The core equipment of the dry coal powder gasification technology is a gasification furnace, and a coal powder burner is the core component of the gasification furnace, so that the performance and the service life of the equipment directly influence the effective running of normal reaction in the gasification furnace, the quality of gasification process products and the long-period stable operation of the gasification process products.

Although a great deal of research is carried out on gasification furnace burners at home and abroad, the problems to be solved still exist. For example, when the gasifier normally operates, the ignition burner (start-up burner) is stopped after the process burner is put into use, when the device generates meter fluctuation error, operator misoperation or pulverized coal system fluctuation and the like, the production is stopped emergently and the pressure is released, after the fault is eliminated, the ignition, the temperature rise and the pressure rise are carried out, and after the system is preheated, the condition of feeding gas to the downstream can be met, besides the fault elimination time, a large amount of time is consumed, all synthesis gas in the time is discharged into a torch for combustion, and simultaneously, during the pressure reduction and the pressure rise of the gasifier, the temperature in the system changes along with the fault, so that the scale sheets on the inner walls of equipment and pipelines are easy to fall off, and the long-period operation of the gasifier is seriously influenced; if the ignition burner is continuously used, the head of the ignition burner is ablated at high temperature, so that the service life of the ignition burner is short, and the service life of the ignition burner becomes one of important factors for limiting the long period of the gasification furnace. Simultaneously continuously using the ignition burner to convert part of the ignition fuel gas into ineffective CO₂The energy consumption of the device operation is increased, and the production efficiency is influenced.

Therefore, a burner is needed to be designed, so that the burner has a long service life, and can be immediately ignited in a high-pressure and high-temperature environment when a problem occurs in the production process, the production period is ensured, and the production efficiency is further improved.

Disclosure of Invention

The application provides a gasification burner for high-pressure online ignition and a control method thereof, which are used for solving the problems that the conventional burner is short in service life and cannot be immediately ignited under the conditions of high temperature and high pressure.

In one aspect, the present application provides a gasification burner for high pressure online ignition, comprising: the burner comprises a burner central pipe, a burner inner pipe, a burner middle pipe, a burner outer pipe and an igniter;

water cooling jackets are arranged outside the burner inner pipe and the burner outer pipe;

the burner central pipe, the burner inner pipe, the burner intermediate pipe and the burner outer pipe are connected in sequence from inside to outside through coaxial nesting;

the pipe diameter of the outlet end of the burner inner pipe is slightly smaller than that of the inlet end of the burner inner pipe, and the pipe diameter of the outlet end of the burner outer pipe is slightly smaller than that of the inlet end of the burner outer pipe;

the igniter is arranged at the outlet end of the burner central tube;

the inlet end of the burner central pipe is respectively connected with a gas input pipe and a protective gas input pipe;

the outlet end of the burner central tube is positioned inside the burner inner tube;

the inlet end of the burner inner pipe is connected with a first oxygen input pipe;

the inlet end of the burner middle pipe is connected with a second oxygen input pipe;

the inlet end of the burner outer tube is connected with a pulverized coal input tube;

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.

Optionally, the outlet end of the burner intermediate tube is provided with a strong swirl cover.

In another aspect, the present application provides a method for controlling a gasification burner for high-pressure online ignition, comprising the steps of:

introducing fuel gas into the burner central tube, and introducing oxygen into the burner inner tube;

igniting fuel gas in a central tube of a burner and oxygen in an inner tube of the burner by an igniter to obtain internal environmental parameters of the gasifier, wherein the environmental parameters comprise first-stage parameters and second-stage parameters;

the first stage parameters include: flame monitoring and flame vision screen (temperature);

the second stage parameters include: gasifier temperature and pressure;

judging whether the environmental parameter is larger than a preset value;

and if the environmental parameter is larger than the preset value, introducing oxygen into the burner middle pipe, stopping introducing fuel gas into the burner middle pipe after introducing pulverized coal into the burner outer pipe, introducing protective gas into the burner middle pipe, and maintaining the flow of oxygen in the burner inner pipe to be constant.

Further comprising the steps of:

acquiring the working state information of the gasification furnace; the working state information comprises normal and abnormal;

if the working state information is abnormal, stopping introducing oxygen into the burner middle pipe, stopping introducing coal powder into the burner outer pipe, simultaneously stopping introducing protective gas into the burner center pipe, and introducing fuel gas into the burner center pipe;

and igniting the fuel gas in the central pipe of the burner and the oxygen in the inner pipe of the burner by an igniter.

According to the technical scheme, the gasification burner for high-pressure online ignition and the control method thereof are provided, and the gasification burner comprises a burner central tube, a burner inner tube, a burner intermediate tube, a burner outer tube and an igniter; the method comprises the steps of introducing fuel gas into a burner central tube, introducing oxygen into a burner inner tube, igniting the fuel gas in the burner central tube and the oxygen in the burner inner tube through an igniter to obtain internal environmental parameters of the gasification furnace, and starting temperature and pressure rise of the gasification furnace to reach normal operation working conditions if the environmental parameters are greater than preset values; and after the burner middle pipe is filled with oxygen, the burner outer pipe is filled with pulverized coal, the gasifier operates normally, then the oxygen is continuously filled into the burner inner pipe (the oxygen does not exit), the fuel gas is stopped being filled into the burner center pipe, and protective gas is filled into the burner center pipe. When a coal powder system breaks down or instrument error fluctuation or operator misoperation and the like, the medium of a burner middle pipe and the medium of a burner outer pipe are withdrawn, fuel gas is introduced into the burner center pipe, meanwhile, the introduction of protective gas into the burner center pipe is stopped, the fuel gas in the burner center pipe and the oxygen in the burner inner pipe are ignited through an igniter, the internal environmental parameters of the gasification furnace are obtained, if the environmental parameters are larger than a preset value (if the environmental parameters are not larger than a set value within a set time, a gasification safety protection parking system is triggered, the introduction of oxygen into the burner inner pipe is stopped, the introduction of the fuel gas into the burner center pipe is stopped, and the protective gas is introduced into the burner center pipe). The gas types in the burner inner pipe and the burner intermediate pipe are controlled, so that production interruption is avoided by online ignition when the inside of the gasification furnace is abnormally stopped, and the problems that the existing burner is short in service life and cannot be immediately ignited under the high-temperature and high-pressure condition are solved.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a gasification burner for high pressure in-line ignition;

FIG. 2 is a schematic cross-sectional view of the swirl pot of the present application;

fig. 3 is an operation schematic diagram of the control method of the gasification burner for high-pressure online ignition according to the present application.

Wherein, the burner comprises 1-a burner central pipe, 2-a burner inner pipe, 3-a burner middle pipe, 4-a burner outer pipe and 5-an igniter.

Detailed Description

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.

The application provides a gasification nozzle for high pressure is igniteed on line, includes: the burner comprises a burner central pipe 1, a burner inner pipe 2, a burner intermediate pipe 3, a burner outer pipe 4 and an igniter 5;

water cooling jackets are arranged outside the burner inner pipe 2 and the burner outer pipe 4;

and the burner central pipe 1, the burner inner pipe 2, the burner intermediate pipe 3 and the burner outer pipe 4 are arranged from inside to outside.

Are sequentially connected through coaxial nesting;

the igniter 5 is arranged at the outlet end of the burner central tube 1;

the inlet end of the burner central tube 1 is respectively connected with a gas input tube and a shielding gas input tube;

the outlet end of the burner central tube 1 is positioned inside the burner inner tube 2;

the inlet end of the burner inner pipe 2 is connected with a first oxygen input pipe;

the inlet end of the burner middle pipe 3 is connected with a second oxygen input pipe;

the inlet end of the burner outer tube 4 is connected with a pulverized coal input tube.

When ignition operation is required, fuel gas is introduced into the burner central tube 1, and when ignition is successful and the feeding (coal feeding) operation of the gasification furnace is stable, protective gas is introduced into the burner central tube 1; and after protective gas is introduced into the burner central tube 1, the start-up burner (ignition burner) is extinguished at the moment. The outlet ends of the burner central tube 1 and the burner inner tube 2 are positioned in the burner middle tube, and the protective gas and the oxygen are continuously introduced; the burning nozzle can effectively avoid ablation of the burner nozzle central pipe 1 and the burner nozzle inner pipe 2, and influences service life.

Oxygen is continuously let in to nozzle inner tube 2 inside, when needs are igniteed the operation, through fuel gas in the nozzle center tube 1 with nozzle inner tube 2's oxygen mixes, can ignite immediately, avoids because can't ignite successfully, results in the production stops, influences production efficiency.

The pipe diameter of the exit end of nozzle inner tube 2 slightly is less than the pipe diameter of the entrance point of nozzle inner tube 2, more concrete be, for passing through the oxygen of nozzle inner tube 2 provides certain output angle, makes the follow the oxygen of 2 outputs in the nozzle inner tube can with the fuel gas contact of nozzle center tube, misce bene, the ignition of being convenient for, simultaneously 2 exit angle in the nozzle inner tube is very little, nozzle middle tube 3 sets up strong whirl cover, withdraws from on line behind 1 fuel gas of nozzle center tube, 2 oxygen in the nozzle inner tube with the oxygen in the nozzle middle tube 3 takes place the coupling effect, with having the inclination angle the buggy of nozzle outer tube 4 fully contacts, mixes, burns, raises the efficiency. The online high-pressure ignition is that when the gasifier exits from the oxygen in the burner middle pipe 3 and the pulverized coal in the burner outer pipe 4, fuel gas of the burner center pipe is introduced, protective gas of the burner center pipe 1 is stopped, the igniter 5 is put into use at the same time, after the high-pressure online ignition, internal environment parameters of the gasifier are obtained within preset values (within 5-15 seconds), oxygen in the burner inner pipe 2 is continuously introduced into the volume of the gasifier, the oxygen concentration is within a safe range and far less than the explosion limit, the normal combustion of the gasifier is in an oxygen deficiency environment of 50-65%, at the moment, the oxygen introduced from the burner inner pipe 2 and carbon monoxide in the gasifier are combusted to generate carbon dioxide within preset time, at the moment, the temperature of the gasifier is above 1300 ℃, the gasifier is in absolute safety within preset time, and the ignition safety coefficient is improved, ensuring the smooth production.

The pipe diameter of the exit end of nozzle inner tube 2 slightly is less than the pipe diameter of the entrance point of nozzle inner tube 2, more specifically is, for passing through the oxygen of nozzle inner tube 2 provides certain output angle, makes the follow the oxygen of 2 outputs in the nozzle inner tube can with the fuel gas contact of nozzle center tube 1, misce bene, the ignition of being convenient for, simultaneously 2 exit angle in the nozzle inner tube is very little, nozzle intermediate tube 3 sets up strong whirl cover, withdraws from on line behind 1 fuel gas of nozzle center tube, 2 oxygen in the nozzle inner tube with the coupling effect takes place for oxygen in the nozzle intermediate tube 3, with having the nozzle inclination the buggy of nozzle outer tube 3 fully contacts, mixes, burns, raises the efficiency. The online high-pressure ignition is that when the gasification furnace withdraws from the oxygen in the burner middle pipe 3 and the pulverized coal in the burner outer pipe 4, fuel gas of the burner center pipe 1 is introduced, protective gas of the burner center pipe 1 is stopped, the igniter 5 is put into use at the same time, after the high-pressure online ignition, the internal environment parameters of the gasification furnace are obtained within a preset value (within 5-15 seconds), oxygen in the burner inner pipe 2 is continuously introduced into the volume of the gasification furnace, the oxygen concentration is within a safe range and is far less than the explosion limit, the normal combustion of the gasification furnace is in an oxygen deficiency environment of 50-65 percent, at the moment, the oxygen introduced from the burner inner pipe 2 is combusted with carbon monoxide in the gasification furnace to generate carbon dioxide within a preset time, at the moment, the temperature of the gasification furnace is above 1300 ℃, the furnace is in absolute safety within a preset time, and the, ensuring the smooth production.

The pipe diameter of the outlet end of the burner outer pipe 4 is smaller than the pipe diameter of the inlet end of the burner outer pipe 4. Can be convenient for material misce bene, make the reaction go on more abundant, simultaneously fine prevent that high temperature flame from burning out the gasifier water-cooled wall. The production efficiency is improved.

Furthermore, a swirl cover is arranged at the outlet end of the burner intermediate pipe 3. The structure of the swirl cover is shown in fig. 2, so that the oxygen disturbance strength inside the burner inner tube 2 can be improved, the reaction can be more complete, and the carbon conversion rate can be improved.

In another aspect, the present application provides a method for controlling a gasification burner for high-pressure online ignition, comprising the steps of:

s1, introducing fuel gas into the central pipe of the burner and introducing oxygen into the inner pipe of the burner;

s2, igniting the fuel gas in the central tube of the burner and the oxygen in the inner tube of the burner by an igniter to obtain internal environment parameters of the gasifier, wherein the environment parameters comprise a first-stage parameter and a second-stage parameter;

the first stage parameters include: flame monitoring and flame vision screen (temperature);

the second stage parameters include: gasifier temperature and pressure;

s3, judging whether the environmental parameter is larger than a preset value;

and S4, if the environmental parameter is larger than the preset value and the pressure and temperature rise to the preset value, introducing oxygen into the burner middle pipe, after introducing pulverized coal into the burner outer pipe, stopping introducing fuel gas into the burner middle pipe, introducing protective gas into the burner middle pipe, and keeping the burner middle pipe in a normal operation state.

Further comprising the steps of:

acquiring the working state information of the gasification furnace; the working state information comprises normal and abnormal;

if the working state information is abnormal, stopping introducing oxygen into the burner middle pipe, stopping introducing coal powder into the burner outer pipe, simultaneously stopping introducing protective gas into the burner center pipe, and introducing fuel gas into the burner center pipe;

and igniting the fuel gas in the central pipe of the burner and the oxygen in the inner pipe of the burner by an igniter.

According to the technical scheme, the gasification burner for high-pressure online ignition and the control method thereof are provided, and the gasification burner comprises a burner central tube, a burner inner tube, a burner intermediate tube, a burner outer tube and an igniter; the method comprises the steps of introducing fuel gas into a burner central tube, introducing oxygen into a burner inner tube, igniting the fuel gas in the burner central tube and the oxygen in the burner inner tube through an igniter to obtain internal environmental parameters of the gasification furnace, and starting temperature and pressure rise of the gasification furnace to reach normal operation working conditions if the environmental parameters are greater than preset values; and introducing oxygen into the burner middle pipe, introducing the protective gas into the burner central pipe after introducing the pulverized coal into the burner outer pipe, stopping introducing the fuel gas into the burner central pipe, and continuously introducing the oxygen into the burner inner pipe (the oxygen does not exit). When a coal powder system fails or instrument error fluctuation or operator error operation causes the medium of a burner middle pipe and a burner outer pipe to withdraw, fuel gas is introduced into the burner center pipe, protective gas is stopped from being introduced into the burner center pipe, the fuel gas in the burner center pipe and oxygen in the burner inner pipe are ignited by an igniter to obtain internal environmental parameters of the gasification furnace, if the environmental parameters are greater than a preset value (if the environmental parameters are not greater than a set value within a specified time, a gasification safety protection parking system is triggered, oxygen introduction into the burner inner pipe is stopped, the fuel gas introduction into the burner center pipe is stopped, the protective gas is introduced into the burner center pipe, the types of the gas in the burner inner pipe and the burner middle pipe are controlled, and when the gasification furnace is abnormally parked, on-line ignition is carried out to avoid production interruption, the problem that the existing burner is short in service life and cannot be immediately ignited under the condition of high temperature and high pressure is solved.

The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.

Claims (4)

1. A gasification burner for high pressure on-line ignition, comprising: the burner comprises a burner central pipe (1), a burner inner pipe (2), a burner middle pipe (3), a burner outer pipe (4) and an igniter (5);

water cooling jackets are arranged outside the burner inner pipe (2) and the burner outer pipe (4);

the burner central pipe (1), the burner inner pipe (2), the burner intermediate pipe (3) and the burner outer pipe (4) are connected in sequence from inside to outside through coaxial nesting;

the pipe diameter of the outlet end of the burner inner pipe (2) is slightly smaller than that of the inlet end of the burner inner pipe (2), and the pipe diameter of the outlet end of the burner outer pipe (4) is slightly smaller than that of the inlet end of the burner outer pipe (4);

the igniter (5) is arranged at the outlet end of the burner central tube (1);

the inlet end of the burner central pipe (1) is respectively connected with a gas input pipe and a shielding gas input pipe;

the outlet end of the burner central pipe (1) is positioned inside the burner inner pipe (2);

the inlet end of the burner inner pipe (2) is connected with a first oxygen input pipe;

the inlet end of the burner middle pipe (3) is connected with a second oxygen input pipe;

the inlet end of the burner outer tube (4) is connected with a pulverized coal input tube.

2. A gasification burner for high pressure in-line ignition according to claim 1, characterized in that the outlet end of the burner intermediate tube (3) is provided with a strong swirl cover.

3. A control method for a gasification burner for high-pressure online ignition is characterized by comprising the following steps:

introducing fuel gas into the burner central tube, and introducing oxygen into the burner inner tube;

igniting fuel gas in a central tube of a burner and oxygen in an inner tube of the burner by an igniter to obtain internal environmental parameters of the gasifier, wherein the environmental parameters comprise first-stage parameters and second-stage parameters;

the first stage parameters include: flame monitoring and flame vision screen (temperature);

the second stage parameters include: gasifier temperature and pressure;

judging whether the environmental parameter is larger than a preset value;

and if the environmental parameter is larger than the preset value, introducing oxygen into the burner middle pipe, stopping introducing fuel gas into the burner middle pipe after introducing pulverized coal into the burner outer pipe, introducing protective gas into the burner middle pipe, and maintaining the flow of oxygen in the burner inner pipe to be constant.

4. The method of controlling a gasification burner for high pressure inline ignition of claim 3 further comprising the steps of:

acquiring the working state information of the gasification furnace; the working state information comprises normal and abnormal;

if the working state information is abnormal, stopping introducing oxygen into the burner middle pipe, stopping introducing coal powder into the burner outer pipe, simultaneously stopping introducing protective gas into the burner center pipe, and introducing fuel gas into the burner center pipe;

and igniting the fuel gas in the central pipe of the burner and the oxygen in the inner pipe of the burner by an igniter.

Images