CN107937036B - System and method for controlling oxygen concentration in gasifying agent by circulating fluidized bed gasifier - Google Patents
System and method for controlling oxygen concentration in gasifying agent by circulating fluidized bed gasifier Download PDFInfo
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- CN107937036B CN107937036B CN201711237692.1A CN201711237692A CN107937036B CN 107937036 B CN107937036 B CN 107937036B CN 201711237692 A CN201711237692 A CN 201711237692A CN 107937036 B CN107937036 B CN 107937036B
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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
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
- C10J3/56—Apparatus; Plants
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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
- C10J3/723—Controlling or regulating the gasification process
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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
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Gasification And Melting Of Waste (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A system and a method for controlling oxygen concentration in gasifying agent by circulating fluidized bed gasifying furnace belong to the field of gas chemical industry, comprising gasifying furnace; the method is characterized in that: the oxygen source, the oxygen line pneumatic cut-off valve, the oxygen line pneumatic regulating valve, the oxygen heater and the pneumatic cut-off valve are sequentially connected and are divided into three oxygen trunk lines after passing through the pneumatic cut-off valve, wherein the three oxygen trunk lines comprise an upmix area trunk line, a downmix area trunk line and a bottom trunk line; the vapor line includes a vapor source; the steam source is connected with the steam access point; the nitrogen line comprises a nitrogen source and a proportioning nitrogen pneumatic regulating valve. The nitrogen source is connected to each trunk line to timely adjust the concentration of oxygen in the gasifying agent, so that the operation flexibility of the gasifying agent is improved. The construction and operation cost of the equipment is reduced. Meanwhile, the distribution of the gasifying agents with multiple nozzles ensures that the gasifying agents and the raw materials can be fully mixed in the gasifier, and local super Wen Jieba caused by hot spots formed in the gasifier is avoided.
Description
Technical Field
The invention belongs to the field of gas chemical industry, and particularly relates to a system and a method for controlling oxygen concentration in a gasifying agent by a circulating fluidized bed gasifier.
Background
The extensive use of fossil energy has led to an increasing environmental pressure and the clean use of coal is urgent. The development of large-scale coal gasification technology is the key to clean utilization of coal resources. Among large-scale coal gasification technologies, fluidized bed gasification technologies have a plurality of attractive advantages, and fluidized bed coal gasification technologies which are industrially applied on a large scale in the past mainly include a German Windler coal gasification technology, a Lurgi circulating fluidized bed coal gasification technology, a U-Gas gasifier, a KRW gasifier, an ICC ash fusion fluidized bed pulverized coal gasifier in China, a CAGG ash fusion coal gasification technology and an Ende furnace pulverized coal gasification technology.
The gasifying agent is mixed gas of oxygen and steam. The mode of gasifying agent entering the fluidized bed is generally that the gasifying agent entering the fluidized bed can make ascending coal gas entrain fine coal dust and dust to generate secondary reaction at the lower part of the coal inlet nozzle or at the upper part and the lower part of the coal inlet nozzle. The local over-temperature in the gasification furnace is easily caused by the local introduction of the gasifying agent, hot spots are formed, melting and coking are carried out, and slag is formed on the wall surface of the gasification furnace. Influence the research and development of the large-scale gasification furnace.
The current gasification agent of the circulating fluidized bed gasification furnace is regulated and solidified in oxygen concentration, the operation elasticity is small, and the gasification reaction limitation is strong.
The common gasifying agent feeding device of the fluidized bed gasifier comprises a gas redistributor and a pipeline mixer, has complex structure, is easy to damage and high in price, and is not easy to replace after being damaged.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a system and a method for controlling the oxygen concentration in a gasifying agent by a circulating fluidized bed gasifier.
The invention relates to a system for controlling oxygen concentration in gasifying agent of a circulating fluidized bed gasifier, which comprises a gasifier; the gasification furnace comprises a gasification furnace body, a lower mixing zone, an upper mixing zone and a lower mixing zone, wherein the gasification furnace body is sequentially provided with the upper mixing zone, the lower mixing zone and the bottom mixing zone from top to bottom; the device also comprises an oxygen line, a nitrogen line and a steam line; the oxygen line comprises an oxygen source, an oxygen line pneumatic cut-off valve, an oxygen line pneumatic regulating valve, an oxygen heater and a pneumatic cut-off valve; the oxygen source, the oxygen line pneumatic cut-off valve, the oxygen line pneumatic regulating valve, the oxygen heater and the pneumatic cut-off valve are sequentially connected and are divided into three oxygen main lines after passing through the pneumatic cut-off valve, wherein the three oxygen main lines comprise an upmix area main line, a downmix area main line and a bottom main line; the three oxygen main lines are respectively communicated with the upper mixing zone, the lower mixing zone and the bottom mixing zone of the gasification furnace; the three oxygen main lines are respectively provided with a shower guide valve, a pneumatic regulating valve, a steam access point and a nitrogen access point in sequence; a steam access point is arranged in front of the oxygen heater and the pneumatic cut-off valve; the vapor line includes a vapor source; the steam source is connected with the steam access point; the nitrogen line comprises a nitrogen source and a proportioning nitrogen pneumatic regulating valve; the nitrogen source is respectively connected with the nitrogen access points on the three oxygen gas dry lines through three nitrogen gas dry lines; and each nitrogen trunk line is provided with a proportioning nitrogen pneumatic regulating valve.
The invention relates to a system for controlling oxygen concentration in gasifying agent of a circulating fluidized bed gasifier, wherein a steam line further comprises a steam line pneumatic regulating valve, a standby steam line pneumatic regulating valve and a standby steam line pneumatic cut-off valve; the steam source is connected with a steam access point between the oxygen heater and the pneumatic cut-off valve through a steam line pneumatic control valve; the steam source is connected with a steam access point on a dry line of the upmixing area through a spare steam line pneumatic regulating valve; and the steam source is respectively connected with steam access points on the trunk line and the bottom trunk line of the downmixed area through a standby steam line pneumatic cut-off valve.
The invention relates to a system for controlling oxygen concentration in gasifying agent of a circulating fluidized bed gasifier, wherein a plurality of branches are respectively arranged at the access ends of an upmixing area trunk line, a downmixing area trunk line, a bottom trunk line and the gasifier.
The system for controlling the oxygen concentration in the gasifying agent of the circulating fluidized bed gasifying furnace is characterized in that the tail ends of the branches are respectively provided with a reducing nozzle, so that the gasifying agent can be uniformly sprayed into the gasifying furnace. And the mixing of oxygen and steam is completed by adjusting the variable-diameter nozzles of each branch, so that stable conveying and flow adjustment of the gasifying agent are realized.
The invention relates to a system for controlling oxygen concentration in gasifying agent of a circulating fluidized bed gasifier, wherein 6-12 branches are arranged at the inlet end of a trunk line of an upmixing zone and the gasifier; the inlet ends of the downmixing area trunk line and the gasification furnace are provided with 18-24 branches; and 1 branch is arranged between the bottom trunk line and the access end of the gasification furnace.
The invention relates to a system for controlling oxygen concentration in gasifying agent of a circulating fluidized bed gasifier, wherein the shell side preheating medium of an oxygen heater is steam of 4.0 MPa. The oxygen is preheated to about 100 ℃, the preheated oxygen is better mixed with steam, and a large amount of condensate is avoided to be generated while the reaction requirement is met. The steam is the steam source according to the technical scheme, and the flow of the steam is correspondingly regulated by the temperature of oxygen at the outlet of the oxygen heater.
The method for controlling the oxygen concentration in the gasifying agent by the circulating fluidized bed gasifier comprises the following steps:
1) And (3) establishing a loop: quartz sand is added into the gasification furnace before feeding, a proportioning nitrogen pneumatic regulating valve is opened, and proportioning nitrogen is introduced to enable the sand to be circularly fluidized in the furnace;
2) Heating pipe condensation removal: all valves are in a closed state in the initial environment; opening a pneumatic cut-off valve, then opening a steam line pneumatic regulating valve, enabling steam to enter an oxygen trunk line, opening a shower guide valve on the oxygen trunk line, and performing heating pipe condensation;
3) Introducing steam: after the gasification furnace is charged, sequentially opening pneumatic regulating valves on three oxygen dry lines of an upper mixing area main line, a lower mixing area main line and a bottom main line, introducing steam into the gasification furnace, and measuring the flow by a flowmeter behind the pneumatic regulating valves;
4) Introducing oxygen: after the gasification furnace is charged and steam is introduced, closing the shower guide valve in the step 2, opening an oxygen line pneumatic cut-off valve, adjusting an oxygen line pneumatic adjusting valve, and introducing oxygen;
5) Oxygen concentration accurate control: according to the feeding working condition and the actual proportioning requirement, a proportioning nitrogen pneumatic regulating valve on a nitrogen source is regulated, the oxygen flow is regulated by the pneumatic regulating valve, and the concentration of oxygen in the gasifying agent is proportioned by nitrogen to meet the proportioning requirement under the specific working condition; the ratio of oxygen to steam in the gasifying agent is controlled through an oxygen line pneumatic regulating valve and a steam line pneumatic regulating valve; the flow ratio of the gasifying agent entering the upper mixing zone, the lower mixing zone and the bottom of the gasification furnace is controlled by a pneumatic regulating valve.
According to the method for controlling the oxygen concentration in the gasifying agent by the circulating fluidized bed gasifier, in the step 5), the flow ratio of the gasifying agent entering the upper mixing zone, the lower mixing zone and the bottom of the gasifier is 3:6:1.
According to the system and the method for controlling the oxygen concentration in the gasifying agent by using the circulating fluidized bed gasifier, the concentration of the oxygen in the gasifying agent is timely adjusted by connecting the nitrogen source to each main line, and the operation flexibility of the gasifying agent is improved by using the proportion of the nitrogen to the oxygen in the gasifying agent according to the reaction conditions and the reaction degree in the circulating fluidized bed gasifier in the gasification reaction process. The gasifying agent oxygen and the steam are directly mixed in the pipeline and then are sprayed into the furnace, so that the construction and operation cost of equipment are reduced. Meanwhile, the distribution of the gasifying agents with multiple nozzles ensures that the gasifying agents and the raw materials can be fully mixed in the gasifier, so that hot spots in the gasifier are avoided, and local super Wen Jieba is avoided. Each branch is provided with a corresponding regulating valve, and the flow of the gasifying agent distributed to each branch can be timely regulated according to the reaction working condition in the furnace.
Drawings
FIG. 1 is a schematic diagram of a system for controlling oxygen concentration in gasifying agent in a circulating fluidized bed gasifier according to the present invention;
wherein the device comprises a 1-oxygen heater, a 2-steam line pneumatic regulating valve, a 3-pneumatic cut-off valve, a 4-pneumatic regulating valve, a 5-steam source, a 6-nitrogen source, a 7-proportion nitrogen pneumatic regulating valve, an 8-oxygen source, a 9-gasification furnace, a 10-standby steam line pneumatic regulating valve, a 11-standby steam line pneumatic cut-off valve, a 12-upper mixing area, a 13-lower mixing area, a 14-bottom mixing area, a 15-oxygen line pneumatic cut-off valve, a 16-oxygen line pneumatic regulating valve and a 17-shower guiding valve.
Detailed Description
The system and method for controlling oxygen concentration in gasifying agent of circulating fluidized bed gasification furnace according to the present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the system for controlling the oxygen concentration in the gasifying agent of the circulating fluidized bed gasification furnace in the present embodiment includes a gasification furnace 9; the gasifier body of the gasifier 9 is sequentially provided with an upper mixing zone 12, a lower mixing zone 13 and a bottom mixing zone 14 from top to bottom; the device also comprises an oxygen line, a nitrogen line and a steam line; the oxygen line comprises an oxygen source 8, an oxygen line pneumatic cut-off valve 15, an oxygen line pneumatic regulating valve 16, an oxygen heater 1 and a pneumatic cut-off valve 3; the oxygen source 8, the oxygen line pneumatic cut-off valve 15, the oxygen line pneumatic regulating valve 16, the oxygen heater 1 and the pneumatic cut-off valve 3 are sequentially connected and are divided into three oxygen main lines after passing through the pneumatic cut-off valve 3, wherein the three oxygen main lines comprise an upmix area main line, a downmix area main line and a bottom main line; the three oxygen main lines are respectively communicated with an upper mixing zone 12, a lower mixing zone 13 and a bottom mixing zone 14 of the gasification furnace 9; the three oxygen main lines are respectively provided with a shower guide valve 17, a pneumatic control valve 4, a steam access point and a nitrogen access point in sequence; a steam access point is arranged in front of the oxygen heater 1 and the pneumatic cut-off valve 3; the steam line comprises a steam source 5; the steam source 5 is connected with the steam access point; the nitrogen line comprises a nitrogen source 6 and a proportioning nitrogen pneumatic regulating valve 7; the nitrogen source 6 is respectively connected with nitrogen access points on the three oxygen gas dry lines through three nitrogen gas dry lines; and each nitrogen trunk line is provided with a proportioning nitrogen pneumatic regulating valve 7. The steam line also comprises a steam line pneumatic regulating valve 2, a standby steam line pneumatic regulating valve 10 and a standby steam line pneumatic cut-off valve 11; the steam source 5 is connected with a steam access point between the oxygen heater 1 and the pneumatic cut-off valve 3 through a steam line pneumatic control valve 2; the steam source 5 is connected with a steam access point on a dry line of the upmix zone through a spare steam line pneumatic regulating valve 10; the steam source 5 is connected with steam access points on the downmixed area trunk line and the bottom trunk line respectively through a standby steam line pneumatic cut-off valve 11.
The invention relates to a system for controlling oxygen concentration in gasifying agent of a circulating fluidized bed gasifier, wherein 6 branches are arranged at the inlet end of a trunk line of an upmixing area and a gasifier 9; the inlet end of the downmixing area trunk line and the gasification furnace 9 is provided with 18 branches; the access end of the bottom trunk line and the gasification furnace 9 is provided with 1 branch. The tail end of each branch is provided with a reducing nozzle. The shell side preheating medium of the oxygen heater 1 is steam of 4.0 MPa. The steam is the steam source 5 according to the technical scheme, and the flow of the steam is correspondingly regulated by the temperature of the oxygen at the outlet of the oxygen heater 1.
The method for controlling the oxygen concentration in the gasifying agent by the circulating fluidized bed gasifier comprises the following steps:
1) And (3) establishing a loop: quartz sand is added into the gasification furnace 9 before feeding, a proportioning nitrogen pneumatic regulating valve 7 is opened, and proportioning nitrogen is introduced to make the sand circularly fluidized in the furnace;
2) Heating pipe condensation removal: all valves are in a closed state in the initial environment; opening a pneumatic cut-off valve 3, then opening a steam line pneumatic regulating valve 2, enabling steam to enter an oxygen trunk line, opening a shower guide valve 17 on the oxygen trunk line, and performing heating pipe condensation discharging;
3) Introducing steam: after the gasification furnace 9 is charged, sequentially opening the pneumatic control valves 4 on the three oxygen dry lines of the upper mixing area main line, the lower mixing area main line and the bottom main line, introducing steam into the gasification furnace 9, and measuring the flow by a flowmeter behind the pneumatic control valves 4;
4) Introducing oxygen: after the gasification furnace 9 is charged and steam is introduced, closing the shower guide valve 17 in the step 2, opening the oxygen line pneumatic cut-off valve 15, and adjusting the oxygen line pneumatic adjustment valve 16 to introduce oxygen;
5) Oxygen concentration accurate control: according to the feeding working condition and the actual proportioning requirement, a proportioning nitrogen pneumatic regulating valve 7 on a nitrogen source 6 is regulated, the oxygen flow is regulated by a pneumatic regulating valve 4, and the concentration of oxygen in the gasifying agent is proportioned by nitrogen to meet the proportioning requirement under the specific working condition, so that the atmosphere environment of gasification reaction in the furnace can realize oxygen-deficient gasification, air gasification and oxygen-enriched gasification; the ratio of oxygen to steam in the gasifying agent is controlled through the oxygen line pneumatic control valve 16 and the steam line pneumatic control valve 2; the flow ratio of the gasifying agent entering the upper mixing zone 12, the lower mixing zone 13 and the bottom of the gasification furnace 9 is controlled by the pneumatic control valve 4.
According to the method for controlling the oxygen concentration in the gasifying agent by the circulating fluidized bed gasifier, in the step 5), the flow ratio of the gasifying agent entering the upper mixing zone 12, the lower mixing zone 13 and the bottom of the gasifier 9 is 3:6:1, so that uniform temperature distribution in the gasifier 9, stable gas speed and stable pressure difference are ensured. When the system is in chain jump, the pneumatic cut-off valve 3 is closed, the standby steam line pneumatic regulating valve 10 and the standby steam line pneumatic cut-off valve 11 are automatically opened, and steam is introduced to reduce the temperature of materials in the gasification furnace 9, so that coke scars are prevented from being formed in the furnace instantaneously.
The above description is merely of specific embodiments, but the protection scope of the present invention is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (6)
1. A method for controlling the oxygen concentration in a gasifying agent of a circulating fluidized bed gasifier, which is based on a system for controlling the oxygen concentration in a gasifying agent of a circulating fluidized bed gasifier, the system comprising a gasifier (9); the gasifier body of the gasifier (9) is sequentially provided with an upper mixing zone (12), a lower mixing zone (13) and a bottom mixing zone (14) from top to bottom; the method is characterized in that: the device also comprises an oxygen line, a nitrogen line and a steam line;
the oxygen line comprises an oxygen source (8), an oxygen line pneumatic cut-off valve (15), an oxygen line pneumatic regulating valve (16), an oxygen heater (1) and a pneumatic cut-off valve (3); the oxygen source (8), the oxygen line pneumatic cut-off valve (15), the oxygen line pneumatic regulating valve (16), the oxygen heater (1) and the pneumatic cut-off valve (3) are sequentially connected and are divided into three oxygen main lines after passing through the pneumatic cut-off valve (3), wherein the three oxygen main lines comprise an upmix area main line, a downmix area main line and a bottom main line; the three oxygen main lines are respectively communicated with an upper mixing zone (12), a lower mixing zone (13) and a bottom mixing zone (14) of the gasification furnace (9); the three oxygen main lines are respectively provided with a shower guide valve (17), a pneumatic regulating valve (4), a steam access point and a nitrogen access point in sequence; a steam access point is arranged in front of the oxygen heater (1) and the pneumatic cut-off valve (3);
the steam line comprises a steam source (5); the steam source (5) is connected with the steam access point;
the nitrogen line comprises a nitrogen source (6) and a proportioning nitrogen pneumatic regulating valve (7); the nitrogen source (6) is respectively connected with nitrogen access points on the three oxygen trunk lines through three nitrogen trunk lines; each nitrogen trunk line is provided with a proportioning nitrogen pneumatic regulating valve (7); the steam line also comprises a steam line pneumatic regulating valve (2), a standby steam line pneumatic regulating valve (10) and a standby steam line pneumatic cut-off valve (11); the steam source (5) is connected with a steam access point between the oxygen heater (1) and the pneumatic cut-off valve (3) through a steam line pneumatic regulating valve (2); the steam source (5) is connected with a steam access point on a dry line of the upmixing area through a standby steam line pneumatic regulating valve (10); the steam source (5) is respectively connected with steam access points on the trunk line and the bottom trunk line of the downmixed area through a standby steam line pneumatic cut-off valve (11);
the application method of the system for controlling the oxygen concentration in the gasifying agent according to the circulating fluidized bed gasifier comprises the following steps:
1) And (3) establishing a loop: quartz sand is added into a gasification furnace (9) before feeding, a proportioning nitrogen pneumatic regulating valve (7) is opened, and proportioning nitrogen is introduced to make the sand circularly fluidized in the furnace;
2) Heating pipe condensation removal: all valves are in a closed state in the initial environment; opening a pneumatic cut-off valve (3), then opening a steam line pneumatic regulating valve (2), enabling steam to enter an oxygen trunk line, opening an on-oxygen trunk line shower guide valve (17), and performing heating pipe condensation discharge;
3) Introducing steam: after the gasification furnace (9) is charged, sequentially opening pneumatic regulating valves (4) on three oxygen dry lines of an upper mixing area main line, a lower mixing area main line and a bottom main line, introducing steam into the gasification furnace (9), and measuring the flow by a flowmeter behind the pneumatic regulating valves (4);
4) Introducing oxygen: after the gasification furnace (9) is charged and steam is introduced, closing the shower guide valve (17) in the step 2, opening the oxygen line pneumatic cut-off valve (15), and adjusting the oxygen line pneumatic adjusting valve (16) to introduce oxygen;
5) Oxygen concentration accurate control: according to the feeding working condition and the actual proportioning requirement, a proportioning nitrogen pneumatic regulating valve (7) on a nitrogen source (6) is regulated, the oxygen flow is regulated by a pneumatic regulating valve (4), the concentration of oxygen in the gasifying agent is proportioned by nitrogen, the proportioning requirement under the specific working condition is met, and the proportion of oxygen and steam in the gasifying agent is controlled by an oxygen line pneumatic regulating valve (16) and a steam line pneumatic regulating valve (2); the flow ratio of the gasifying agent entering the upper mixing zone (12), the lower mixing zone (13) and the bottom of the gasification furnace (9) is controlled by the pneumatic control valve (4).
2. The method for controlling oxygen concentration in gasification agent of circulating fluidized bed gasification furnace according to claim 1, wherein: the upper mixing area trunk line, the lower mixing area trunk line, the bottom trunk line and the access end of the gasification furnace (9) are respectively provided with a plurality of branches.
3. The method for controlling oxygen concentration in gasification agent of circulating fluidized bed gasification furnace according to claim 2, wherein: the tail ends of the branches are provided with reducing nozzles.
4. A method of controlling oxygen concentration in a gasification agent in a circulating fluidized bed gasification furnace according to claim 2 or 3, characterized in that: the inlet ends of the upmix zone trunk line and the gasification furnace (9) are provided with 6-12 branches; the inlet ends of the downmixing area trunk line and the gasification furnace (9) are provided with 18-24 branches; and 1 branch is arranged between the bottom trunk line and the access end of the gasification furnace (9).
5. The method for controlling oxygen concentration in gasification agent in circulating fluidized bed gasification furnace according to claim 4, wherein: the shell side preheating medium of the oxygen heater (1) is steam with the pressure of 4.0 MPa.
6. The method for controlling oxygen concentration in gasification agent of circulating fluidized bed gasification furnace according to claim 1, wherein: in the step 5), the flow ratio of the gasifying agent entering the upper mixing zone (12), the lower mixing zone (13) and the bottom of the gasifying furnace (9) is 3:6:1.
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| CN113637502A (en) * | 2021-07-30 | 2021-11-12 | 宁夏神耀科技有限责任公司 | Control method for ignition burner of pressurized gasifier and ignition device |
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| CN106906004A (en) * | 2017-03-23 | 2017-06-30 | 山东晋煤明水化工集团有限公司 | Pulverized coal gasification control method and pulverized coal gasification device |
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