阅读说明：本技术 用于加压气化炉点火烧嘴的控制方法及点火装置 (Control method for ignition burner of pressurized gasifier and ignition device ) 是由 马钊 张镓铄 匡建平 张亚宁 马丹丹 夏支文 庄忠华 白云波 陈毅烈 杜常宗 袁 于 2021-07-30 设计创作，主要内容包括：本发明公开了用于加压气化炉点火烧嘴的控制方法及点火装置,涉及气化炉技术领域。发明人对点火烧嘴的工作气体做了改进,采用次高压蒸汽、氧气和氮气作为点火烧嘴和煤粉烧嘴的工作气体,次高压蒸汽加入后能够加大氧气流速,出烧嘴处高温火焰能够远离烧嘴出口断面,同时由于蒸汽热熔大,吸收燃烧热,进一步降低高温火焰对烧嘴出口向火断面烧蚀,能够显著延长烧嘴的使用寿命。此外,通过工作气体的改进有利于降低氮气的通入量,能够减少产品中的氮气含量。(The invention discloses a control method and an ignition device for an ignition burner of a pressurized gasification furnace, and relates to the technical field of gasification furnaces. The inventor has made the improvement to the working gas of ignition nozzle, adopts inferior high-pressure steam, oxygen and nitrogen gas as the working gas of ignition nozzle and buggy nozzle, can increase the oxygen velocity of flow after inferior high-pressure steam adds, goes out nozzle department high temperature flame and can keep away from nozzle export section, because steam hot melt is big simultaneously, absorbs the heat of combustion, further reduces high temperature flame and to the nozzle export to the section ablation of firing, can show the life who prolongs the nozzle. In addition, the improvement of the working gas is beneficial to reducing the input amount of nitrogen, and the nitrogen content in the product can be reduced.)

1. A control method for an ignition burner of a pressurized gasifier is characterized by comprising the following steps:

introducing secondary high-pressure steam, oxygen and nitrogen as working gases into oxygen channels of the ignition burner and the pulverized coal burner;

the temperature of the secondary high-pressure steam is 280-360 ℃, and the pressure is 5.4-6.0 MPa.

2. The control method according to claim 1, characterized in that under the online operation condition of the ignition burner, the total amount of the secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner is controlled to be 800kg/h-3500 kg/h;

preferably, under the online operation condition of the ignition burner, the amount of the secondary high-pressure steam introduced into the ignition burner is 100kg/h-400kg/h, and the amount of the secondary high-pressure steam introduced into the pulverized coal burner is 400kg/h-3400 kg/h.

3. The control method according to claim 1, wherein under the on-line extinguishing condition of the ignition burner, the total amount of the secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner is controlled to be 800kg/h-3500 kg/h.

4. The control method according to claim 3, wherein under the on-line extinguishing condition of the ignition burner, the amount of the secondary high-pressure steam introduced into the ignition burner is 300kg/h-600kg/h, and the amount of the secondary high-pressure steam introduced into the pulverized coal burner is 200kg/h-3200 kg/h.

5. The control method according to any one of claims 1 to 4, characterized in that oxygen is heated to 190 ℃ and then mixed with the secondary high-pressure steam and introduced into the ignition burner and the pulverized coal burner.

6. The control method according to claim 5, wherein the secondary high pressure steam is filtered and then mixed with oxygen to be introduced into the ignition burner and the pulverized coal burner;

preferably, when the pressure difference between the secondary high-pressure steam and the oxygen is lower than 150kPa-300kPa, the secondary high-pressure steam is stopped from being fed into the ignition burner and the pulverized coal burner.

7. An ignition device for implementing the control method of any one of claims 1 to 6, comprising an ignition burner, a pulverized coal burner, a secondary high-pressure steam pipeline, an oxygen pipeline and a nitrogen pipeline, wherein the discharge ends of the secondary high-pressure steam pipeline, the oxygen pipeline and the nitrogen pipeline are communicated with the ignition burner and the pulverized coal burner.

8. The ignition device of claim 7, further comprising a first mixer and a second mixer, wherein the feed end of the first mixer is communicated with the discharge ends of the secondary high-pressure steam pipeline, the oxygen pipeline and the nitrogen pipeline, and the discharge end of the first mixer is communicated with the feed inlet of the pulverized coal burner;

the feed end of the second mixer is communicated with the discharge ends of the secondary high-pressure steam pipeline, the oxygen pipeline and the nitrogen pipeline, and the discharge end of the second mixer is communicated with the feed inlet of the ignition burner.

9. The ignition device according to claim 7, wherein an oxygen heater for heating the oxygen is further provided on the oxygen line.

10. The ignition device of claim 9, wherein the secondary high pressure steam line is further provided with a steam filter for filtering the secondary high pressure steam.

Technical Field

The invention relates to the technical field of gasification furnaces, in particular to a control method and an ignition device for an ignition burner of a pressurized gasification furnace.

Background

The traditional coal gasification ignition burner (also called pilot burner or start-up burner) is mainly used for starting-up ignition of a gasification furnace, heating and boosting the gasification furnace, and igniting a pulverized coal burner. After the gasifier is put into coal and normally operates, the ignition burner mainly has two modes of operation, one mode is to extinguish the ignition burner, and the other mode is to ensure that the ignition burner does not extinguish when operating on line.

The operation mode of the ignition burner in the prior art generally has the following problems: the ignition burner has short service life because the high-temperature flame ablates the fire section of the burner outlet; more nitrogen is introduced during the operation process, which results in higher nitrogen content in the synthesis gas.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a control method and an ignition device for an ignition burner of a pressurized gasifier, aiming at reducing the ablation of high-temperature flame to the fire section of the outlet of the burner and prolonging the service life of the burner.

The invention is realized by the following steps:

in a first aspect, the present invention provides a method for controlling an ignition burner for a pressurized gasifier, comprising: introducing secondary high-pressure steam, oxygen and nitrogen as working gases into oxygen channels of the ignition burner and the pulverized coal burner; the temperature of the secondary high-pressure steam is 280-360 ℃, and the pressure is 5.4-6.0 MPa.

In an optional embodiment, under the online operation condition of the ignition burner, the total amount of secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner is controlled to be 800kg/h-3500 kg/h; preferably, under the online operation condition of the ignition burner, the amount of secondary high-pressure steam introduced into the ignition burner is 100kg/h-400kg/h, and the amount of secondary high-pressure steam introduced into the pulverized coal burner is 400kg/h-3400 kg/h.

In an optional embodiment, under the on-line extinguishing working condition of the ignition burner, the total amount of secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner is controlled to be 800kg/h-3500 kg/h; preferably, under the on-line extinguishing working condition of the ignition burner, the secondary high-pressure steam is introduced into the ignition burner at 300kg/h-600kg/h, and the secondary high-pressure steam is introduced into the pulverized coal burner at 200kg/h-3200 kg/h.

In an alternative embodiment, the oxygen is heated to 190 ℃ and then mixed with secondary high-pressure steam and introduced into the ignition burner and the pulverized coal burner.

In an optional embodiment, the secondary high-pressure steam is filtered and then mixed with oxygen to be introduced into the ignition burner and the pulverized coal burner; preferably, when the temperature of the secondary high-pressure steam is reduced to the saturation temperature or the pressure difference between the secondary high-pressure steam and oxygen is lower than 150kPa-300kPa, the feeding of the secondary high-pressure steam to the ignition burner and the pulverized coal burner is stopped.

In a second aspect, the invention provides an ignition device for implementing any one of the control methods in the foregoing embodiments, including an ignition burner, a pulverized coal burner, a secondary high-pressure steam line, an oxygen line, and a nitrogen line, where discharge ends of the secondary high-pressure steam line, the oxygen line, and the nitrogen line are all communicated with the ignition burner and the pulverized coal burner.

In an optional embodiment, the pulverized coal burner further comprises a first mixer and a second mixer, wherein the feeding end of the first mixer is communicated with the discharging ends of the secondary high-pressure steam pipeline, the oxygen pipeline and the nitrogen pipeline, and the discharging end of the first mixer is communicated with the feeding hole of the pulverized coal burner; the feed end of the second mixer is communicated with the discharge ends of the secondary high-pressure steam pipeline, the oxygen pipeline and the nitrogen pipeline, and the discharge end of the second mixer is communicated with the feed inlet of the ignition burner.

In an optional embodiment, an oxygen heater for heating the oxygen is further arranged on the oxygen pipeline; preferably, the secondary high-pressure steam line is further provided with a steam filter for filtering the secondary high-pressure steam.

The invention has the following beneficial effects: the inventor has made the improvement to the working gas of ignition nozzle, adopts inferior high-pressure steam, oxygen and nitrogen gas as the working gas of ignition nozzle and buggy nozzle, can increase the oxygen velocity of flow after inferior high-pressure steam adds, goes out nozzle department high temperature flame and can keep away from nozzle export section, because steam hot melt is big simultaneously, absorbs the heat of combustion, further reduces high temperature flame and to the nozzle export to the section ablation of firing, can show the life who prolongs the nozzle. In addition, the improvement of the working gas is beneficial to reducing the input amount of nitrogen, and the nitrogen content in the product can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of an ignition device provided in an embodiment of the present invention.

Description of the main element symbols: 100-an ignition device; 110-an ignition burner; 120-pulverized coal burner; 130-times high pressure steam line; 140-an oxygen line; a 150-nitrogen line; 160-a first mixer; 170-a second mixer; 180-an oxygen heater; 190-vapor filter.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The embodiment of the invention provides a control method for an ignition burner of a pressurized gasifier, which comprises the following steps: introducing secondary high-pressure steam, oxygen and nitrogen as working gases into oxygen channels of the ignition burner and the pulverized coal burner; the temperature of the secondary high-pressure steam is 280-360 ℃, and the pressure is 5.4-6.0 MPa.

In the actual operation process, a branch can be arranged on a secondary high-pressure steam conveying pipeline corresponding to the pulverized coal burner, the secondary high-pressure superheated steam is introduced into the ignition burner by utilizing an oxygen pipeline on the ignition burner, and the secondary high-pressure superheated steam and the oxygen are fully mixed and then enter a firing burner channel. Can increase the oxygen velocity of flow after inferior high-pressure steam adds, go out nozzle department high temperature flame and can keep away from nozzle export section, simultaneously because steam hot melt is big, absorb the heat of combustion, further reduce high temperature flame and export the section ablation of being fired to the nozzle, can show the life who prolongs the nozzle. The nitrogen is mainly added as a purging protective gas for protecting an oxygen pipeline during the startup and shutdown of the device.

In addition, under the on-line extinguishing working condition, the secondary high-pressure steam can be used for replacing high-pressure nitrogen, the nitrogen content in the synthetic gas is increased, the product yield of the post-system synthesis device is improved, and the method is particularly suitable for the process that the downstream synthesis device needs low nitrogen content. Meanwhile, steam is adopted to replace high-pressure nitrogen, the using amount of sub-high-pressure steam is relatively large, the flow velocity of the head of the ignition burner is correspondingly increased, and the risk of the pulverized coal burner for pit combustion of the flame of the ignition burner is reduced.

It should be noted that no matter the ignition burner is extinguished on line or operated, the flow velocity of the burner head can be adjusted by adding secondary high-pressure steam through the oxygen channel, so that the purposes of controlling a high-temperature flame area in a hearth of the gasification furnace and enlarging the operation elastic space of the gasification furnace are achieved. Therefore, the control method of the embodiment of the application has the remarkable characteristics of long online service cycle of the ignition burner, operation flexibility and the like, particularly, after the online service cycle of the ignition burner is prolonged, the ignition burner is operated in a non-extinguishing mode during online coal feeding operation of the gasification furnace, and the problems of abnormal vehicle jumping such as instrument fluctuation error, misoperation of operators or coal powder system fluctuation are well solved, so that the device can be quickly recovered to produce within 10 minutes, the time is saved, and the material waste is reduced. In addition, the risk that the scale sheets of the water system fall off and are blocked during the process of parking, pressure relief, ignition, boosting and gas mixing of the device can be reduced, the parking economic loss of the device can be reduced to the minimum, and the operation and the maintenance are convenient.

The inventor optimizes the gas input amount of the ignition burner under two working conditions, and controls the pressure and the temperature of the gasification furnace better by further controlling the ventilation amount of the ignition burner and the pulverized coal burner. The method comprises the following specific steps:

controlling the total amount of secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner to be 800kg/h-3500kg/h under the online operation condition of the ignition burner; the amount of secondary high-pressure steam introduced into the ignition burner is 100kg/h-400kg/h, and the amount of secondary high-pressure steam introduced into the pulverized coal burner is 400kg/h-3400 kg/h.

It is noted that when the operation of the gasification furnace reaches normal pressure, oxygen is introduced into the ignition burner as a fixed value; under the online operating condition of the ignition burner, the amount of secondary high-pressure superheated steam introduced into the oxygen pipeline of the ignition burner is gradually increased, the amount of secondary high-pressure superheated steam introduced into the oxygen pipeline of the pulverized coal burner is reduced, the oxygen flow rate at the outlet of the ignition burner can be increased, high-temperature ablation of the head of the ignition burner to the fire surface is reduced, and the online service cycle of the ignition burner is ensured. Specifically, the increase of the ignition burner steam is basically consistent with the decrease of the pulverized coal burner steam, so that the reaction in the gasifier is ensured, and the amount of secondary high-pressure superheated steam introduced into an oxygen pipeline of the ignition burner can be increased or decreased according to the load of the gasifier so as to ensure a temperature field of the gasifier, so that the vault of the gasifier is not over-heated and slag discharge is smooth.

Controlling the total amount of secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner to be 800kg/h-3500kg/h under the on-line extinguishing working condition of the ignition burner; the amount of secondary high-pressure steam introduced into the ignition burner is 300kg/h-600kg/h, and the amount of secondary high-pressure steam introduced into the pulverized coal burner is 200kg/h-3200 kg/h.

It should be noted that the oxygen amount and the nitrogen amount of the ignition burner under the online operation condition and the online extinguishing condition of the ignition burner are approximately the same as those of the prior art.

When the operation of the gasification furnace reaches normal pressure, the introduction of oxygen into the ignition burner is a fixed value or the oxygen is cut off, and secondary high-pressure steam is introduced completely; under the online working condition that extinguishes of ignition nozzle, progressively to letting in inferior high-pressure superheated steam volume in the oxygen pipeline of throwing the ignition nozzle, reduce simultaneously and let in inferior high-pressure superheated steam volume in the oxygen pipeline of buggy nozzle and the oxygen pipeline of ignition nozzle and let in high-pressure nitrogen gas volume, increase ignition nozzle exit medium velocity of flow, outwards withdraw from buggy nozzle burning flame to reduce ignition nozzle head and to the high temperature ablation of fire face department, ensure the online life cycle of ignition nozzle, ensure simultaneously that nitrogen content is low in the synthetic gas.

In a preferred embodiment, the oxygen is heated to 170-190 ℃ (such as 170 ℃, 180 ℃, 190 ℃ and the like), and then mixed with the secondary high-pressure steam and introduced into the ignition burner and the pulverized coal burner, so that the steam temperature is prevented from being reduced and cooled after the oxygen is mixed with the secondary high-pressure superheated steam.

In some embodiments, the secondary high pressure steam is filtered and then mixed with oxygen and introduced into the ignition burner and the pulverized coal burner to prevent the introduction of impurities.

In some embodiments, the supply of sub-high pressure steam to the ignition burner and the pulverized coal burner is stopped when the sub-high pressure steam temperature decreases to the saturation temperature or the pressure difference between the sub-high pressure steam and oxygen is less than 150kPa to 300 kPa. In the actual operation process, a secondary high-pressure superheated steam temperature low interlock and a pressure difference low interlock (secondary high-pressure steam pressure and oxygen pressure) are set, and when the secondary high-pressure steam temperature is reduced to the saturation temperature or the pressure difference is lower than a certain value (150kPa-300kPa), a pulverized coal burner oxygen pipeline and a burner oxygen pipeline steam control valve are closed in an interlocking manner.

Specifically, when the pulverized coal burner is stopped on line or jumped in an interlocking manner, the program interlocks to close the ignition burner oxygen pipeline steam control valve; and if the ignition burner is in the on-line extinguishing working condition, firstly opening the ignition burner oxygen pipeline nitrogen protection valve, and then closing the ignition burner oxygen pipeline steam control valve.

It should be noted that, during the independent operation of the ignition burner, the steam control valve of the oxygen pipeline of the ignition burner is closed, and after the pulverized coal burner is normally used, the secondary high-pressure superheated steam is introduced into the oxygen pipeline of the ignition burner.

In a second aspect, the present invention provides an ignition device 100 for implementing any one of the control methods in the foregoing embodiments, including an ignition burner 110, a pulverized coal burner 120, a secondary high-pressure steam line 130, an oxygen line 140, and a nitrogen line 150, where discharge ends of the secondary high-pressure steam line 130, the oxygen line 140, and the nitrogen line 150 are all communicated with the ignition burner 110 and the pulverized coal burner 120.

Specifically, the secondary high-pressure steam line 130, the oxygen line 140, and the nitrogen line 150 may be provided with regulating valves for regulating the flow rate; pressure and temperature detectors may be provided to detect pressure and temperature from time to time.

In an alternative embodiment, the pulverized coal burner further comprises a first mixer 160 and a second mixer 170, wherein the feeding end of the first mixer 160 is communicated with the discharging ends of the secondary high-pressure steam pipeline 130, the oxygen pipeline 140 and the nitrogen pipeline 150, and the discharging end of the first mixer 160 is communicated with the feeding hole of the pulverized coal burner 120; the feed end of the second mixer 170 is communicated with the discharge ends of the secondary high-pressure steam pipeline 130, the oxygen pipeline 140 and the nitrogen pipeline 150, and the discharge end of the second mixer 170 is communicated with the feed inlet of the ignition burner 110. The first mixer 160 and the second mixer 170 both play a role in material mixing, and uniformly mix secondary high-pressure steam, oxygen and nitrogen and then convey the mixture to the pulverized coal burner 120 or the ignition burner 110.

In some embodiments, an oxygen heater 180 for heating the oxygen is further disposed on the oxygen pipeline 140, and the oxygen heater 180 may heat the oxygen with medium-pressure saturated steam and output medium-pressure saturated steam condensate.

In some embodiments, a vapor filter 190 is also disposed on the secondary high pressure vapor line 130 for filtering the secondary high pressure vapor.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1

The present embodiment provides a control method for an ignition burner of a pressurized gasifier, which employs the ignition device 100 in fig. 1, and aims at the gasifier process parameters as follows: gas production in 120000Nm³/h-160000Nm³/h。

Controlling the total amount of secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner to be 1500kg/h under the online operation condition of the ignition burner; the amount of secondary high-pressure steam introduced into the ignition burner is 200kg/h, and the amount of secondary high-pressure steam introduced into the pulverized coal burner is 1300 kg/h.

Controlling the total amount of secondary high-pressure steam introduced into the ignition burner and the pulverized coal burner to be 1500kg/h under the on-line extinguishing working condition of the ignition burner; the amount of secondary high-pressure steam introduced into the ignition burner is 400kg/h, and the amount of secondary high-pressure steam introduced into the pulverized coal burner is 1100 kg/h.

The results show that the service life of the ignition burner can reach more than 3 years, and the nitrogen content in the product of the gasification furnace is less than 0.2% v (dry basis).

Comparative example 1

The comparative example provides a control method for an ignition burner of a pressurized gasifier, and the difference from the embodiment 1 is that the ignition burner does not introduce secondary high-pressure steam under two working conditions, and the control method specifically comprises the following steps:

under the online operation condition of the ignition burner, the amount of secondary high-pressure steam introduced into the pulverized coal burner is 1500 kg/h.

Under the on-line extinguishing working condition of the ignition burner, the amount of sub-high pressure steam introduced into the pulverized coal burner is 1500kg/h, and the amount of nitrogen introduced into the ignition burner is 600Nm³/h。

The results show that the service life of the ignition burner is less than 2 years, and the nitrogen content in the product of the gasifier is 0.5% v (dry basis).

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.