CN106987282B - Four-channel ignition system of gasification furnace and operation method - Google Patents
Four-channel ignition system of gasification furnace and operation method Download PDFInfo
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- CN106987282B CN106987282B CN201710311778.8A CN201710311778A CN106987282B CN 106987282 B CN106987282 B CN 106987282B CN 201710311778 A CN201710311778 A CN 201710311778A CN 106987282 B CN106987282 B CN 106987282B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2200/00—Details of gasification apparatus
- C10J2200/09—Mechanical details of gasifiers not otherwise provided for, e.g. sealing means
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
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Abstract
The invention relates to a four-channel ignition system of a gasification furnace, which comprises a burner, an ignition unit and four channels, wherein the ignition unit and the four channels are respectively connected with the burner, and the four channels comprise a main oxygen channel, an ignition oxygen channel, a central oxygen channel, a fuel gas channel and a coal water slurry channel. This gasifier four-channel ignition system improves through making the nozzle and the pipeline passageway be connected with the nozzle, and the ignition baker and the operation stage of having avoided the gasifier are gone on through trading the nozzle, and the pipeline passageway setting of being connected with the nozzle simultaneously makes the gasifier whole operation more steady, the automation mechanized operation of being convenient for. The invention also relates to an operation method of the gasification furnace four-channel ignition system.
Description
Technical Field
The invention relates to the technical field of coal water slurry gasifier equipment, in particular to a four-channel ignition system of a gasifier and an operation method.
Background
The high efficiency and clean utilization of coal are always important subjects in the environmental protection and energy field of China, and are also one of the key technologies influencing the primary energy proportional structure of China. Coal gasification is one of the main uses of coal in China at present, and is a main way for converting primary energy into cleaner secondary energy. The technology of pressurized gasification of coal water slurry is that oxidant and coal water slurry are mixed by a process burner and then sprayed to a reactor of an entrained flow bed at a very high speed, and the mixture is converted into synthesis gas of which effective gas is carbon monoxide and hydrogen under the condition of high-temperature and high-pressure incomplete oxidation, and is one of the ways of coal clean use recognized in the world today.
In the prior art in this field, the furnace baking and coal slurry charging stages of the coal water slurry gasification furnace are generally performed by using two burners respectively: firstly, an ignition furnace baking burner is used for baking the furnace, after the furnace temperature reaches a preset condition, the furnace baking burner is detached, and then a coal slurry operation burner (process burner) is installed for coal gasification operation. The method has the disadvantages of inconvenient mouth changing process, long commissioning time, unsafe mouth changing process and easy potential safety hazard.
The Chinese patent document with application publication number CN 101709229A relates to a coal water slurry process burner with long service life and a processing method thereof. The process burner consists of an inner burner, a middle burner and an outer burner which are coaxially sleeved and provided with a streamline front closing end, wherein wear-resistant coatings are respectively sprayed on the inner wall surface of the middle burner and the outer wall surface of the outer burner, and the service performance of the process burner under severe working conditions is improved by spraying the wear-resistant coatings. The scheme only improves the process burner, and does not fundamentally solve the problems of inconvenience and safety caused by the process of changing the burner due to the ignition and the drying of the gasifier and the operation mechanism.
The Chinese patent document with application publication number CN 105647586A relates to an ignition device for a water-coal-slurry cold-wall gasification furnace. The burner of the technical scheme is still divided into a process burner and an ignition start burner, so that the structure of the gasification furnace is more complicated.
To sum up, need in this field improve the ignition system and the nozzle of current coal slurry gasifier, avoid the inconvenience and the safety problem that current gasifier nozzle changing process brought, make the ignition baker and the operation of gasifier more steady, the operation is convenient simultaneously.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a four-channel ignition system of a gasification furnace and an operation method thereof.
In order to achieve the purpose, the invention provides a four-channel ignition system of a gasification furnace, which comprises a burner, an ignition unit and four channels, wherein the ignition unit and the four channels are respectively connected with the burner; the central oxygen channel is separated from the main oxygen channel, the head end of the central oxygen channel is positioned on the main oxygen channel, and the tail end of the central oxygen channel and the tail end of the main oxygen channel are both connected to the burner.
The primary oxygen is also referred to as exo-epoxy, supra; the ignition oxygen is also used in the oven and is therefore also referred to as ignition oven oxygen.
Furthermore, the burner is a four-channel burner, four channels in the burner are concentrically arranged from the center to the edge of the burner, and the four channels from the center to the edge of the burner are respectively connected to a central oxygen channel, a fuel gas channel, a coal water slurry channel, a main oxygen channel and an ignition oxygen channel. In one embodiment, four channels in the burner are concentrically arranged from the center to the edge of the burner, and the four channels from the center to the edge of the burner are connected to the fuel gas channel, the central oxygen channel, the coal-water slurry channel, and the primary oxygen and ignition oxygen channels, respectively.
Further, nitrogen protection isolating devices are respectively arranged on the main oxygen channel, the ignition oxygen pipeline, the central oxygen channel and the fuel gas channel, each nitrogen protection isolating device comprises a nitrogen protection circuit connected to the main oxygen channel or the ignition oxygen pipeline and two stop valves on the main oxygen channel or the ignition oxygen pipeline and respectively positioned on two sides of the corresponding nitrogen protection circuit, and each nitrogen protection circuit is also provided with a stop valve.
Further, before the nitrogen protection isolation devices on the main oxygen channel, the ignition oxygen pipeline and the fuel gas channel, emptying devices are respectively arranged, and each emptying device comprises an emptying line connected to the channels or pipelines and an emptying stop valve on the emptying line.
Furthermore, a regulating valve and a flowmeter are respectively arranged in front of the emptying devices on the main oxygen channel, the ignition oxygen pipeline and the fuel gas channel in sequence; a flow meter and a regulating valve are arranged in sequence after the two shut-off valves on the central oxygen channel.
Furthermore, on the ignition oxygen pipeline and the fuel gas channel, the regulating valve and the flowmeter are respectively arranged in a mode of two groups of parallel connection. Wherein, each two groups of parallel regulating valves are divided into regulating valves with large and small flow control, so as to respectively correspond to ignition and furnace baking procedures. For example, the ignition program uses a small flow controlled ignition oxygen regulating valve and a fuel gas regulating valve; the furnace baking procedure uses a furnace baking oxygen regulating valve and a fuel gas regulating valve which are controlled in large flow.
Furthermore, a nitrogen purging circuit connected to the main oxygen passage and the fuel gas passage is respectively arranged behind the nitrogen protection and isolation devices on the main oxygen passage and the fuel gas passage; and the far end of the main oxygen channel, which is far away from the burner, is also provided with an oxygen main cut-off valve.
Further, the coal water slurry channel comprises a coal water slurry circulation line, two-position stop valves and a nitrogen protection line in sequence, and then is connected to the burner. And the coal water slurry circulation valve is arranged on the coal water slurry circulation line, and the coal water slurry is circulated on the coal water slurry circulation line after the coal water slurry circulation valve is opened.
Further, the ignition unit comprises an ignition coil, an ignition rod propelling cylinder and an ignition rod in sequence, and then is connected to the burner. In one embodiment, the ignition rod extends into the central oxygen passage of the burner upon actuation of the ignition rod pushing cylinder. During the ignition procedure, the ignition rod is pushed by the ignition rod into the cylinder to move downwards for a certain distance, then fuel gas and oxygen are introduced, the ignition coil is ignited, after the ignition, the ignition coil is powered off, and the ignition rod retracts to the original position.
Further, gasifier four-channel ignition system still includes the other flame detecting element of nozzle, flame detecting element is including the two trip valves of flame interlock, flame detector and the detection corridor that connect gradually, then is connected to the gasifier. In one embodiment, the two-position cut-off valve of the detection channel is configured to be opened manually and remotely before ignition and closed automatically after the pressure of the gasification furnace rises to 1.0 MPa. In one embodiment, the flame detection units are in two groups; in another embodiment, the flame detection unit is an automatic flame detection unit, and is further provided with a camera monitor system.
The invention also provides an operation method of the gasification furnace four-channel ignition system, which comprises the steps of ignition and furnace baking, coal slurry feeding and fuel gas withdrawal, wherein,
the ignition oven drying step comprises:
opening the air release cut-off valves of the air release circuits on the fuel gas channel and the ignition oxygen pipeline, and respectively establishing the flow of fuel gas and oxygen by using the regulating valves on the fuel gas channel and the ignition oxygen pipeline according to the set oxygen-fuel ratio; sequentially opening a near-end cut-off valve of a burner on a fuel gas channel, closing a cut-off valve of a nitrogen protection circuit on the fuel gas channel, opening a far-end cut-off valve of the burner on the fuel gas channel, and closing an emptying cut-off valve of an emptying circuit on the fuel gas channel; starting an ignition coil; sequentially opening a near-end cut-off valve of a burner on an ignition oxygen pipeline, closing a cut-off valve of a nitrogen protection circuit on the ignition oxygen pipeline, opening a far-end cut-off valve of the burner on the ignition oxygen pipeline, and closing an emptying cut-off valve of an emptying circuit on the ignition oxygen pipeline; when the flame detector detects a flame or the flame is manually seen through the camera monitor system, the ignition is confirmed to be successful by pressing an ignition manual confirmation button, for example.
The coal slurry feeding step comprises the following steps:
respectively establishing a coal water slurry flow and an oxygen flow according to a set oxygen-coal ratio; sequentially opening a near-end cut-off valve of a burner on a coal water slurry channel, closing a two-position cut-off valve of a nitrogen protection circuit on a main oxygen channel, opening a far-end cut-off valve of the burner on the coal water slurry channel, and closing a coal water slurry circulating valve on a coal water slurry circulating circuit; then opening a nozzle near-end cut-off valve on the main oxygen channel, closing a cut-off valve of an emptying line on the main oxygen channel, and opening a nozzle far-end cut-off valve on the main oxygen channel in sequence; after the valve is in place, the coal slurry is successfully fed.
The fuel gas withdrawal step comprises:
opening a stop valve of a nitrogen purging line on the fuel gas channel, opening a near-end stop valve of a burner on the central oxygen channel, and purging the corresponding burner channel; closing two cut-off valves on the ignition oxygen pipeline and two cut-off valves on the fuel gas channel, and opening the cut-off valves of the nitrogen protection circuit on the fuel gas channel and the ignition oxygen pipeline; after the valve is in place, opening a far-end stop valve of a burner on the central oxygen channel, closing a stop valve of a nitrogen purging line on the fuel gas channel, and closing a stop valve of a nitrogen protection line on the central oxygen channel; after the valve is in place, the fuel gas is successfully withdrawn.
Furthermore, the operation method of the gasification furnace four-channel ignition system also comprises an emergency stop step, wherein the emergency stop step is divided into an ignition furnace baking stage and an emergency stop step of a coal slurry feeding and fuel gas exiting stage, wherein,
the emergency stop step of the ignition furnace baking stage comprises the following steps (the following valves start to act simultaneously, and the sequence is not in sequence):
closing two cut-off valves on the ignition oxygen pipeline and two cut-off valves on the fuel gas channel, and closing the fuel gas channel and an emptying cut-off valve of an emptying line on the ignition oxygen pipeline; opening the cut-off valves of the nitrogen protection circuits on the fuel gas channel, the central oxygen channel and the ignition oxygen pipeline; opening a stop valve of a nitrogen purging line on the main oxygen channel, delaying for 25 seconds, and then closing; two shut-off valves on the central oxygen channel are opened and closed after delaying for 25 seconds.
The emergency stop step of the coal slurry feeding and fuel gas exiting stage comprises the following steps (the following valves start to act simultaneously, and the sequence is not in sequence):
closing two stop valves on the main oxygen channel; the two cut-off valves on the coal water slurry channel are closed after 1 second of delay; opening a stop valve of a nitrogen purging line on the main oxygen channel, delaying for 25 seconds, and then closing; the nitrogen purging cut-off valves in the two cut-off valves on the coal water slurry channel are opened after 7 seconds of delay, and the nitrogen purging cut-off valves are closed after 10 seconds of purging;
and if the coal slurry feeding and fuel gas withdrawing stages are stopped emergently before the fuel gas is withdrawn, executing the emergency stopping step of the ignition furnace-baking stage at the same time.
In one embodiment, when the emergency stop timer is equal to 7 seconds, a shut-off valve of a nitrogen protection circuit on the coal water slurry channel is opened, and the shut-off valve is closed after 10 seconds of purging; opening two cut-off valves on the central oxygen channel, and closing after delaying for 25 seconds; and opening a stop valve of a nitrogen protection circuit on the central oxygen channel. And for the emergency stop of the fuel gas withdrawal stage, before the fuel gas withdrawal, simultaneously executing the emergency stop step of the ignition furnace-baking stage.
The system of the invention has the following advantages:
after the four-channel ignition system and the corresponding process flow are adopted, ignition, furnace baking and coal slurry input can be automatically completed, a burner does not need to be replaced, time is saved, and safety is improved. In addition, the gasifier can be provided with two emergency stop buttons: the emergency shutdown button can be pressed when abnormal conditions occur in the process of putting the gasification furnace into operation, so that the gasification furnace system is stopped to a safe state.
Drawings
Fig. 1 is a block diagram schematically illustrating the structure of a four-channel ignition system of a gasification furnace according to the present invention.
Fig. 2 is a schematic diagram of the structure and process flow of an embodiment of the gasification furnace four-channel ignition system of the invention.
Reference numerals are as follows, and like letters in the figures designate identically performing elements, unless otherwise indicated in the specification; the numbers following the letters represent the number of the unit:
XV-two position cut-off valve; FV-regulator valve; an FT-flow meter; HPN — high pressure nitrogen; HV-total oxygen shut-off valve; BS-flame interlock; BT-flame detector; XZ-ignition coil.
Detailed Description
The technical scheme and the technical effect of the invention are further explained by the following detailed description and the accompanying drawings. It is to be understood that the following embodiments are illustrative of the present invention, but are not intended to limit the scope of the present invention.
Referring to fig. 1, a block diagram showing a schematic structure of a four-channel ignition system of a gasification furnace according to the present invention is shown. The four-channel ignition system comprises a four-channel burner, an ignition device (an ignition unit) and four channels, wherein the ignition device (the ignition unit) and the four channels are respectively connected with the burner, the four channels comprise a main oxygen and ignition oxygen channel (a channel 3), a central oxygen channel (a channel 2), a fuel gas channel (a channel 1) and a water-coal-slurry channel (a channel 4), the main oxygen and ignition oxygen channel (the channel 3) comprises a main oxygen (outer ring oxygen) channel and ignition oxygen pipelines (ignition and furnace baking oxygen) bridged on the main oxygen channel, and the head end and the tail end of each ignition oxygen pipeline are positioned on the main oxygen channel; the central oxygen channel is separated from the main oxygen channel, the head end of the central oxygen channel is positioned on the main oxygen channel, and the tail end of the central oxygen channel and the tail end of the main oxygen channel are both connected to the burner.
Referring to fig. 2, the charging process of the gasification furnace is divided into three stages: ignition furnace baking, coal slurry feeding and fuel gas withdrawal. The whole process is automatically finished according to the programmed sequence set by an SIS (safety instrumentation system) system.
Initial state of the valve before opening: and a main oxygen nitrogen protection valve (XV-1308), an ignition oxygen nitrogen protection valve (XV-1328), a fuel gas nitrogen protection valve (XV-1365) and a center oxygen nitrogen protection valve (XV-1326) are opened, and other valves are closed.
Igniting and baking the furnace: after the ignition furnace baking process conditions are met, the fire detection channel control valves (XV-1331 and XV-1332) are opened, the ignition initialization button is pressed, the fuel gas vent valve (XV-1361) and the ignition oxygen vent valve (XV-1322) are opened, the total oxygen cutoff valve (HV-1301) of the gasification furnace is controllable, and the ignition furnace is manually opened in a remote control mode. The ignition fuel gas flow rate (FT-1362) and the ignition oxygen flow rate (FT-1331) are adjusted by a fuel gas adjusting valve (FV-1362) and an ignition oxygen adjusting valve (FV-1331), respectively. After the ignition fuel gas and oxygen flow are established according to the set oxygen-fuel ratio, the ignition button is pressed, and the ignition rod moves downwards for a certain distance under the driving of an ignition rod propelling cylinder (XV-1366). After the ignition rod is in place, the following action programs are sequentially executed: 1. a second fuel gas shut-off valve (XV-1363) is opened, and a fuel gas nitrogen protection valve (XV-1365) is closed; 2. a first cut-off valve (XV-1362) of the fuel gas is opened, a fuel gas emptying valve (XV-1361) is closed, and an ignition coil (XZ-1368) is started at the same time; 3. the ignition oxygen second cut-off valve (XV-1324) is opened, and the ignition oxygen nitrogen protection valve (XV-1328) is closed; 4. the ignition oxygen first cut-off valve (XV-1323) is opened and the ignition oxygen dump cut-off valve (XV-1322) is closed. When the flame detectors (BT-1361 and BT-1362) detect flames or the flames are manually seen through the camera monitor system, the manual ignition success button is pressed, and the ignition is successful. The ignition coil (XZ-1368) is powered off, and the ignition rod returns to the original position. Gradually increasing the fuel gas and oxygen amount to enter a furnace baking stage, and entering a second stage when the temperature reaches a set value necessary for feeding and is stabilized for a certain time: and (4) feeding the coal slurry.
Feeding coal slurry: after the ignition and the oven drying are successful, the coal slurry starting conditions are met, and the coal water slurry flow and the oxygen flow are respectively established according to the set oxygen-coal ratio. And (3) pressing a feeding button, sequentially opening a coal water slurry second cut-off valve (XV-1303), closing a main oxygen nitrogen protection valve (XV-1308), opening a coal water slurry first cut-off valve (XV-1302), and closing a coal water slurry circulating valve (XV-1301) when the valve position of the coal water slurry first cut-off valve (XV-1302) is more than 50%. After the valves are in place, a coal slurry charging timer starts to time, and after the set time is reached, the main oxygen second cut-off valve (XV-1306) is opened and the main oxygen emptying valve (XV-1307) is closed in sequence, and when the valve position of the main oxygen emptying valve (XV-1307) is 70 percent smaller, the main oxygen first cut-off valve (XV-1305) is opened. After the main oxygen first cut-off valve, the second cut-off valve are opened and the main oxygen emptying valve is closed in place, the coal slurry is successfully fed, and the method enters a third stage: the fuel gas is withdrawn.
Fuel gas withdrawal: the fuel gas exit button is pressed, and the valve acts according to a set program: firstly opening a fuel gas nitrogen purging valve (XV-1364) and a central oxygen second shut-off valve (XV-1329), starting purging corresponding burner channels, then closing ignition oxygen shut-off valves (XV-1323, XV-1324) and fuel gas shut-off valves (XV-1362, XV-1363), opening a fuel gas nitrogen protection valve (XV-1365) and an ignition oxygen nitrogen protection valve (XV-1328), opening a central oxygen first shut-off valve (XV-1327) after the valves are in place, and finally closing the fuel gas nitrogen purging valve (XV-1364) and the central oxygen nitrogen protection valve (XV-1326). The ignition furnace fuel gas shut-off valves (XV-1362, XV-1363) and the ignition oxygen shut-off valves (XV-1323, XV-1324) are closed, the central oxygen two-way shut-off valves (XV-1327, XV-1329) are opened, the fuel gas nitrogen purge valve (XV-1364) and the central oxygen nitrogen protection valve (XV-1326) are closed, and the fuel gas exits successfully after the valves are in place.
Emergency shutdown of the gasification furnace:
in the stage of ignition and oven drying, an ignition (oven drying) emergency stop button is pressed down, and an ignition (oven drying) emergency stop program is executed (the following valves start to act simultaneously, and the sequence is not sequential): the ignition oxygen shut-off valves (XV-1323, XV-1324) and the fuel gas shut-off valves (XV-1362, XV-1363) are closed; closing a fuel gas emptying valve (XV-1361) and an ignition oxygen emptying valve (XV-1322); a fuel gas nitrogen protection valve (XV-1365), an ignition oxygen nitrogen protection valve (XV-1328) and a central oxygen nitrogen protection valve (XV-1326) are opened; the main oxygen secondary nitrogen purge valve (XV-1320) is opened and closed with a delay of 25 seconds; the central oxygen two-way shut-off valves (XV-1327 and XV-1329) are opened and closed after 25 seconds.
And in the coal slurry feeding and fuel gas quitting stage, pressing a coal slurry operation emergency stop button, executing a coal slurry feeding and fuel gas quitting emergency stop program, and starting a coal slurry feeding emergency stop timer. The following valves start to act simultaneously, without any sequence: the main oxygen shut-off valves (XV-1305, XV-1306) are closed; the coal water slurry shut-off valves (XV-1302 and XV-1303) are closed after 1 second delay; the main oxygen nitrogen purge valve (XV-1320) was opened and closed with a 25 second delay. For emergency stop of the coal slurry feeding stage, when the emergency stop timer is equal to 7 seconds, opening a coal water slurry nitrogen purging valve (XV-1321), and closing after purging for 10 seconds; the central oxygen two-way shut-off valves (XV-1327 and XV-1329) are opened and closed after 25 seconds; the center oxygen nitrogen protection valve (XV-1326) is opened. And in the fuel gas withdrawal stage, before the fuel gas is withdrawn, the gasification furnace is emergently stopped, and an ignition emergency stop program is executed at the same time.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A four-channel ignition system of a gasification furnace comprises a burner, an ignition unit and four channels, wherein the ignition unit and the four channels are respectively connected with the burner; the central oxygen channel is separated from the main oxygen channel, the head end of the central oxygen channel is positioned on the main oxygen channel, and the tail end of the central oxygen channel and the tail end of the main oxygen channel are both connected to the burner.
2. The four-channel ignition system of the gasification furnace according to claim 1, wherein the burner is a four-channel burner, four channels of the burner are concentrically arranged from the center to the edge of the burner, and the four channels from the center to the edge of the burner are respectively connected to the central oxygen channel, the fuel gas channel, the coal-water slurry channel, and the primary oxygen and ignition oxygen channels, or are respectively connected to the fuel gas channel, the central oxygen channel, the coal-water slurry channel, and the primary oxygen and ignition oxygen channels.
3. The four-channel ignition system of gasification furnaces according to claim 2, wherein the main oxygen channel, the ignition oxygen line, the central oxygen channel and the fuel gas channel are respectively provided with a nitrogen protection isolation device, the nitrogen protection isolation device comprises a nitrogen protection circuit connected to the channels or lines and two shut valves respectively arranged on the channels or lines and on two sides of the corresponding nitrogen protection circuit, wherein the nitrogen protection circuit is also provided with the shut valves.
4. The four-channel ignition system of claim 3, wherein a venting means is provided before the nitrogen protection and isolation means on the main oxygen channel, the ignition oxygen line and the fuel gas channel, respectively, said venting means comprising a venting line connected to the above channel or line and a venting shut-off valve on the venting line.
5. The four-channel ignition system of gasification furnaces as claimed in claim 4, wherein a regulating valve and a flow meter are provided in sequence before the emptying devices on the main oxygen channel, the ignition oxygen line and the fuel gas channel, respectively; a flow meter and a regulating valve are arranged in sequence after the two shut-off valves on the central oxygen channel.
6. The four-channel ignition system of the gasification furnace according to claim 5, wherein the regulating valve and the flow meter are respectively arranged in two groups in parallel on the ignition oxygen pipeline and the fuel gas channel; a nitrogen purging line connected to the main oxygen passage and the fuel gas passage is respectively arranged behind the nitrogen protection and isolation devices on the main oxygen passage and the fuel gas passage; and the far end of the main oxygen channel, which is far away from the burner, is also provided with an oxygen main shut-off valve.
7. The four-channel ignition system of the gasification furnace according to claim 6, wherein the coal water slurry channel comprises a coal water slurry circulation line, two-position shut-off valves and a nitrogen protection line in sequence, and then is connected to the burner; the ignition unit comprises an ignition coil, an ignition rod propelling cylinder and an ignition rod in sequence, and then is connected to the burner.
8. The gasifier four-channel ignition system of claim 7, further comprising a flame detection unit beside the burner, wherein the flame detection unit comprises a flame interlock, a flame detector and a two-position detection channel shut-off valve which are connected in sequence and then connected to the gasifier.
9. A method for operating a four-channel ignition system of a gasification furnace, which is applied to the four-channel ignition system of the gasification furnace according to any one of claims 1 to 8, the method comprises an ignition furnace baking step, a coal slurry feeding step and a fuel gas withdrawing step,
the ignition oven drying step comprises:
opening the air release cut-off valves of the air release circuits on the fuel gas channel and the ignition oxygen pipeline, and respectively establishing the flow of fuel gas and oxygen by using the regulating valves on the fuel gas channel and the ignition oxygen pipeline according to the set oxygen-fuel ratio; sequentially opening a near-end cut-off valve of a burner on a fuel gas channel, closing a cut-off valve of a nitrogen protection circuit on the fuel gas channel, opening a far-end cut-off valve of the burner on the fuel gas channel, and closing an emptying cut-off valve of an emptying circuit on the fuel gas channel; starting an ignition coil; sequentially opening a near-end cut-off valve of a burner on an ignition oxygen pipeline, closing a cut-off valve of a nitrogen protection circuit on the ignition oxygen pipeline, opening a far-end cut-off valve of the burner on the ignition oxygen pipeline, and closing an emptying cut-off valve of an emptying circuit on the ignition oxygen pipeline; when the flame detector detects the flame or the flame is seen manually through the camera monitor system, the ignition is successful;
the coal slurry feeding step comprises the following steps:
respectively establishing a coal water slurry flow and an oxygen flow according to a set oxygen-coal ratio; sequentially opening a near-end cut-off valve of a burner on a coal water slurry channel, closing a two-position cut-off valve of a nitrogen protection circuit on a main oxygen channel, opening a far-end cut-off valve of the burner on the coal water slurry channel, and closing a coal water slurry circulating valve on a coal water slurry circulating circuit; then sequentially opening a nozzle near-end cut-off valve on the main oxygen channel, closing a cut-off valve of an emptying line on the main oxygen channel, and opening a nozzle far-end cut-off valve on the main oxygen channel; after the valve is in place, the coal slurry is successfully fed;
the fuel gas withdrawal step comprises:
opening a stop valve of a nitrogen purging line on the fuel gas channel, opening a near-end stop valve of a burner on the central oxygen channel, and purging the corresponding burner channel; closing two cut-off valves on the ignition oxygen pipeline and two cut-off valves on the fuel gas channel, and opening the cut-off valves of the nitrogen protection circuit on the fuel gas channel and the ignition oxygen pipeline; after the valve is in place, opening a far-end stop valve of a burner on the central oxygen channel, closing a stop valve of a nitrogen purging line on the fuel gas channel, and closing a stop valve of a nitrogen protection line on the central oxygen channel; after the valve is in place, the fuel gas is successfully withdrawn.
10. The method of operation of claim 9 further comprising an emergency shutdown step divided into an ignition furnace stage and an emergency shutdown step of a coal slurry feed and fuel gas withdrawal stage, wherein,
the emergency stopping step in the ignition furnace baking stage comprises the following steps:
closing two cut-off valves on the ignition oxygen pipeline and two cut-off valves on the fuel gas channel, and closing the fuel gas channel and an emptying cut-off valve of an emptying line on the ignition oxygen pipeline; opening the cut-off valves of the nitrogen protection circuits on the fuel gas channel, the central oxygen channel and the ignition oxygen pipeline; opening a stop valve of a nitrogen purging line on the main oxygen channel, delaying for 25 seconds, and then closing; opening two shut-off valves on the central oxygen channel, delaying for 25 seconds and then closing;
the emergency stop step of the coal slurry feeding and fuel gas exiting stage comprises the following steps:
closing two cut-off valves on the main oxygen channel; delaying 1 second and closing two cut-off valves on the coal water slurry channel; opening a stop valve of a nitrogen purging line on the main oxygen channel, delaying for 25 seconds, and then closing; the nitrogen purging cut-off valves in the two cut-off valves on the coal water slurry channel are opened after 7 seconds of delay, and the nitrogen purging cut-off valves are closed after 10 seconds of purging;
and if the coal slurry feeding and fuel gas withdrawing stages are stopped emergently before the fuel gas is withdrawn, executing the emergency stopping step of the ignition furnace-baking stage at the same time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710311778.8A CN106987282B (en) | 2017-05-05 | 2017-05-05 | Four-channel ignition system of gasification furnace and operation method |
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| CN201710311778.8A CN106987282B (en) | 2017-05-05 | 2017-05-05 | Four-channel ignition system of gasification furnace and operation method |
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| CN106987282A CN106987282A (en) | 2017-07-28 |
| CN106987282B true CN106987282B (en) | 2022-09-23 |
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| CN111019707B (en) * | 2018-10-09 | 2021-04-16 | 中国石化工程建设有限公司 | Method and device for controlling operation of gasification furnace and gasification furnace |
| CN111690441B (en) * | 2019-03-13 | 2021-02-26 | 中国石化工程建设有限公司 | System for gasifier firing and method for gasifier firing |
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