CN115433611A - Gasification furnace steam-water system - Google Patents

Gasification furnace steam-water system Download PDF

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Publication number
CN115433611A
CN115433611A CN202110612994.2A CN202110612994A CN115433611A CN 115433611 A CN115433611 A CN 115433611A CN 202110612994 A CN202110612994 A CN 202110612994A CN 115433611 A CN115433611 A CN 115433611A
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China
Prior art keywords
water
steam
cooled wall
chamber
waste boiler
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Pending
Application number
CN202110612994.2A
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Chinese (zh)
Inventor
栗波
卢彦
马琳
姜德强
彭书
丁建平
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Changzheng Engineering Co Ltd
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Changzheng Engineering Co Ltd
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Priority to CN202110612994.2A priority Critical patent/CN115433611A/en
Publication of CN115433611A publication Critical patent/CN115433611A/en
Pending legal-status Critical Current

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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
    • C10J3/74—Construction of shells or jackets
    • C10J3/76—Water jackets; Steam boiler-jackets
    • 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
    • C10J3/80—Other features with arrangements for preheating the blast or the water vapour
    • 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
    • C10J3/86—Other features combined with waste-heat boilers
    • 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
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1861—Heat exchange between at least two process streams
    • C10J2300/1884—Heat exchange between at least two process streams with one stream being synthesis gas
    • 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
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1861—Heat exchange between at least two process streams
    • C10J2300/1892—Heat exchange between at least two process streams with one stream being water/steam

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present disclosure provides a gasifier soda system, it includes: at least one steam drum, a gasification furnace, a gas pipe and a convection waste boiler which are communicated in sequence; wherein, the gasifier includes: a gasification chamber, a radiation waste boiler and a slag pool chamber which are communicated in sequence; the convection waste boiler comprises: the turning chamber, the first-stage superheater, the second-stage superheater and the evaporator are sequentially communicated; the radiation waste boiler is communicated with the steering chamber through a gas transmission pipe; the steam drum is respectively communicated with the gasification chamber, the radiation waste boiler, the gas pipe and the steering chamber; under the heat exchange state, the saturated water in the steam drum respectively flows into the water-cooled wall of the gasification chamber, the water-cooled wall of the radiation waste boiler, the water-cooled wall of the gas delivery pipe, the water-cooled wall of the steering chamber and the water-cooled wall of the evaporator, and circularly flows into the steam drum again; saturated steam in the steam pocket respectively enters a heat exchange tube of the first section of superheater and a heat exchange tube of the second section of superheater and is conveyed into a power tube network; the system achieves the purpose of effectively recovering the sensible heat of high-temperature gas by the synergistic action of the radiation waste boiler and the convection waste boiler and the supply of saturated cooling water through the steam drum.

Description

Gasification furnace steam-water system
Technical Field
The invention belongs to the technical field of coal gasification, and particularly relates to a steam-water system of a gasification furnace.
Background
Generally, coal gasification refers to a combustion reaction of coal, petroleum coke or other carbon-containing substances and a gasifying agent (oxygen, steam, etc.) in a gasification furnace under a high-temperature and high-pressure environment (1200-1600 ℃, 4.0-6.5 MPa) to convert organic matters in the coal, petroleum coke or other carbon-containing substances into a crude synthesis gas (mainly comprising carbon monoxide and hydrogen).
Because the inside of the gasification furnace is always in a high-temperature environment, in order to protect the shell of the gasification furnace from being over-temperature, the purpose of cooling is generally achieved by adopting a water-cooled wall mode, flowing cooling water is filled in a heat exchange tube of the water-cooled wall, indirect heat exchange is carried out on the cooling water and high-temperature crude synthesis gas, and waste heat of the high-temperature gas is recovered.
In the current coal gasification technology, the heat recovery mode of the high-temperature raw synthesis gas mainly comprises a chilling process and a waste boiler process. Wherein, the chilling process indicates that the high-temperature crude synthesis gas in the gasification chamber directly enters the water bath of the chilling chamber, and the sensible heat of the high-temperature gas is directly transferred to the water phase. The waste boiler flow indicates that high-temperature crude synthesis gas in the gasification chamber passes through two stages of waste boilers successively, sensible heat of high-temperature gas and boiler water are subjected to indirect heat exchange, and steam with required specifications is byproduct.
However, in the chilling process, because sensible heat of the high-temperature raw synthesis gas is largely wasted, the recovery rate is low, the amount of byproduct saturated steam is small, the quality is not high, and the byproduct saturated steam can only be used for steam tracing.
In the process of recovering the waste heat of the high-temperature gasification product, if the high-temperature gas out of the gasification furnace directly enters the evaporator section of the waste heat boiler, fly ash in the synthesis gas can be bonded on the wall of the heat exchange pipe, and the waste boiler is accumulated.
In addition, in the process of coal gasification through total heat recovery, if the high-temperature synthesis gas from the radiation waste boiler enters the high-temperature filter for gas-solid separation, then the separated crude synthesis gas is sent to the convection waste boiler for heat exchange, the temperature of the crude synthesis gas from the radiation waste boiler is about 800 ℃ and then sent to the high-temperature filter, the high-temperature filter needs to bear higher temperature, the requirement on the material is higher inevitably, the equipment investment is larger, the expense of an enterprise is increased forcibly, and therefore the operating cost of the enterprise is increased.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a gasifier steam-water system which is safe, reliable, strong in operability, high in recovery efficiency and in line with the environmental protection requirement, and is used for solving the technical problems that sensible heat is greatly wasted, the recovery rate is low and the like in the prior art.
In order to achieve the purpose, the embodiment of the invention adopts the technical scheme that:
a gasifier steam-water system, comprising: at least one steam drum, a gasification furnace, a gas pipe and a convection waste boiler which are communicated in sequence; wherein, the gasifier includes: a gasification chamber, a radiation waste boiler and a slag pool chamber which are sequentially communicated from top to bottom; the convection waste pot comprises: the turning chamber, the first-stage superheater, the second-stage superheater and the evaporator are sequentially communicated from top to bottom, so that the crude synthesis gas sequentially passes through and flows out of the convection waste boiler; the radiation waste boiler is communicated with the steering chamber through the gas transmission pipe; the steam drum is respectively communicated with the gasification chamber, the radiation waste boiler, the gas pipe and the steering chamber; under the heat exchange state, the saturated water in the steam drum respectively flows into the water-cooled wall of the gasification chamber, the water-cooled wall of the radiation waste boiler, the water-cooled wall of the gas conveying pipe, the water-cooled wall of the steering chamber and the water-cooled wall of the evaporator, and circularly flows into the steam drum again; and saturated steam in the steam pocket respectively enters the heat exchange tube of the first section of superheater and the heat exchange tube of the second section of superheater and then is conveyed into a power pipe network.
In some embodiments of the present disclosure, the gasifier steam-water system further comprises a circulation pump; the steam pocket is respectively communicated with the water-cooled wall of the gasification chamber, the water-cooled wall of the gas conveying pipe, the water-cooled wall of the steering chamber and the water-cooled wall of the evaporator through the circulating pump; and in the heat exchange state, the saturated water in the steam drum maintains the pressurization circulation through the circulating pump.
In some embodiments of the present disclosure, the water-cooled wall of the gasification chamber, the water-cooled wall of the gas delivery pipe, and the water-cooled wall of the turn chamber are configured as a coil-type water-cooled wall structure.
In some embodiments of the present disclosure, the water-cooled walls of the radiant syngas cooler comprise an inner water-cooled wall, a water-cooled screen, and an outer water-cooled wall sequentially arranged in a direction close to the inner wall of the gasifier; and under the heat exchange state, saturated water in the steam drum respectively enters the inner layer water-cooled wall, the water-cooled screen and the outer layer water-cooled wall.
In some embodiments of the present disclosure, the water walls of the evaporator are configured as coil water wall structures or serpentine tube water wall structures.
In some embodiments of the present disclosure, the gasifier steam-water system comprises two steam drums; in a heat exchange state, one steam drum provides saturated water for the gasification chamber and the water-cooled wall of the convection waste boiler through a circulating pump; and the other steam drum provides saturated water for the water-cooled wall of the radiation waste boiler through natural circulation.
In some embodiments of the present disclosure, the gasifier steam-water system comprises three steam drums; in a heat exchange state, one steam drum provides saturated water for a water-cooled wall of the gasification chamber through a circulating pump; the steam drum provides saturated water for the water-cooled wall and the water-cooled screen of the radiation waste boiler through natural circulation; and the steam drum provides saturated water for the water-cooled wall of the convection waste boiler through a circulating pump.
In some embodiments of the present disclosure, a plurality of pulverized coal burners are disposed on a side of the gasification chamber, so that pulverized coal enters the gasification chamber through the pulverized coal burners.
In some embodiments of the present disclosure, a fly ash burner is disposed at the top of the gasification chamber, so that fly ash and gasifying agent enter the gasification chamber through the fly ash burner and are fully mixed with pulverized coal in the gasification chamber.
In some embodiments of the present disclosure, the slag bath chamber is configured as a water bath environment to cool and solidify liquid slag with chilled water.
Compared with the prior art, the invention has the beneficial effects that:
according to the steam-water system of the gasification furnace, the gasification furnace adopts a heat exchange mode of combining the radiation waste boiler and the convection waste boiler, and the steam drum is arranged to respectively provide saturated cooling water for the water-cooled wall of the gasification chamber, the water-cooled wall of the radiation waste boiler, the water-cooled wall of the convection waste boiler and other components, so that the aim of effectively recovering the sensible heat of high-temperature gas is fulfilled. In addition, high-quality superheated steam can be obtained as a byproduct and sent to a power pipe network, so that the aims of fully saving energy and reducing emission are fulfilled.
In addition, the water-cooled wall of the gasification chamber and the water-cooled wall of the convection waste boiler are maintained in a forced circulation mode through a circulating pump, the water-cooled wall of the radiation waste boiler adopts a natural circulation mode, medium-pressure superheated steam is finally generated as a byproduct, and the method has the advantages of low equipment investment and high steam quality.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having alphabetic suffixes or different alphabetic suffixes may represent different instances of similar components. The drawings illustrate various embodiments generally by way of example and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 is a schematic structural diagram of a gasifier steam-water system according to an embodiment of the present invention.
Description of the reference numerals
1-gasification furnace; 2-convection waste boiler; 3-a gasification chamber; 4-radiation of waste boiler; 5-slag pool chamber;
6-gas transmission pipe; 7-a steering chamber; 8-a section of superheater; 9-two-stage superheater; 10-an evaporator;
11-a steam drum; 12-a circulation pump; 13-pulverized coal burner; 14-fly ash burner
W1-W5: a first stream of saturated water-a fifth stream of saturated water;
V1-V2: first-second saturated steam;
V3-V4: first stream of superheated steam-second stream of superheated steam
Detailed Description
The following detailed description of specific embodiments of the present invention is provided in connection with the accompanying drawings, which are not intended to limit the invention. Embodiments of the present disclosure are described in further detail below with reference to the figures and the detailed description, but the present disclosure is not limited thereto.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
At present, in the coal gasification technology, the heat recovery mode of the high-temperature raw synthesis gas mainly comprises a chilling process and a waste boiler process. In the chilling process, sensible heat of the high-temperature crude synthesis gas is greatly wasted, the recovery rate is low, the amount of byproduct saturated steam is small, the quality is not high, the byproduct saturated steam can only be used for steam tracing basically, the serious waste condition occurs, and meanwhile, the requirements of environmental protection, energy conservation and emission reduction cannot be met. For this purpose, the invention provides the following embodiments.
A gasifier steam-water system, see fig. 1, comprising: at least one steam drum 11, a gasification furnace 1, a gas pipe 6 and a convection waste boiler 2 which are communicated in sequence; wherein, gasifier 1 includes: a gasification chamber 3, a radiation waste boiler 4 and a slag pool chamber 5 which are sequentially communicated from top to bottom; the convection waste pot 2 comprises: a turning chamber 7, a first-stage superheater 8, a second-stage superheater 9 and an evaporator 10 which are sequentially communicated from top to bottom so that the crude synthesis gas sequentially passes through and flows out of the convection waste boiler; the radiation waste boiler 4 is communicated with a steering chamber 7 through a gas transmission pipe 6; the steam drum 11 is respectively communicated with the gasification chamber 3, the radiation waste boiler 4, the gas pipe 6 and the steering chamber 7; in the heat exchange state, the saturated water in the steam drum 11 flows into the water-cooled wall of the gasification chamber 3, the water-cooled wall of the radiation waste boiler 4, the water-cooled wall of the gas conveying pipe 6, the water-cooled wall of the steering chamber 7 and the water-cooled wall of the evaporator 10 respectively, and circularly flows into the steam drum 11 again. In the embodiment, the purpose of effectively recovering the sensible heat of the high-temperature gas is achieved by the synergistic effect of the radiation waste boiler 4 and the convection waste boiler 2 and the supply of saturated cooling water through the steam drum 11. Regarding the detailed description of the heat exchange process, the following description will be made by distinguishing different saturated water and saturated steam to illustrate the advantages of the steam-water system of the gasifier.
In the above embodiment, in the heat exchange state, the saturated steam in the steam pocket 11 enters the heat exchange tubes (not shown in the figure) of the first-stage superheater 8 and the heat exchange tubes (not shown in the figure) of the second-stage superheater 9 respectively, and then is conveyed into the power pipe network. The saturated steam is heated by arranging the heat exchange tubes of the first-stage superheater 8 and the second-stage superheater 9 to generate high-quality steam.
In addition, the arrangement mode and the length of the heat exchange tubes of the first-stage superheater 8 and the second-stage superheater 9 can be adaptively adjusted according to requirements. For example, the time length of the saturated steam passing through the heat exchange tubes of the first-stage superheater 8 and the second-stage superheater 9 is adjusted by connecting a plurality of heat exchange tubes in series or in parallel, so that high-quality superheated steam meeting different requirements can be obtained.
In an embodiment, referring to fig. 1, the gasifier steam-water system further comprises a circulation pump 12; the steam pocket 11 is respectively communicated with the water-cooled wall of the gasification chamber 3, the water-cooled wall of the gas pipe 6, the water-cooled wall of the steering chamber 7 and the water-cooled wall of the evaporator 10 through a circulating pump 12; in the heat exchange state, the saturated water in the steam drum 11 maintains the pressurization circulation through the circulating pump 12, thereby providing saturated steam and steam-water two phases meeting different requirements. In this embodiment, a plurality of circulation pumps 12 may be further provided for meeting different pressure requirements of a plurality of strands of different saturated water, and the specific arrangement manner is not further limited herein.
In one embodiment, the water-cooled wall of the gasification chamber 3, the water-cooled wall of the gas delivery pipe 6 and the water-cooled wall of the turn chamber 7 are constructed in a coil-type water-cooled wall structure. In this embodiment, according to actual application scenarios and requirements, the water-cooled wall may also adopt other forms of water-cooled wall structures. In addition, the same or different water wall structures can be adopted among reaction devices in different processes, and the water wall structures are not further limited here.
In one embodiment, the water-cooled walls of the radiant syngas cooler 4 comprise an inner water-cooled wall, a water-cooled screen, and an outer water-cooled wall (not shown) arranged in sequence along a direction close to the inner wall of the gasifier 1; in the heat exchange state, saturated water in the steam drum 11 enters the inner water-cooled wall, the water-cooled screen and the outer water-cooled wall respectively. In this embodiment, the specific composition of the water-cooled wall, including the position of the water-cooled wall in the gasification furnace 1, can be adjusted accordingly according to the actual situation of the coal gasification reaction.
In one embodiment, the water walls of the evaporator are configured as coil-type water walls or serpentine-type water walls. In this embodiment, a specific structural form may be selected according to actual requirements.
In an embodiment, the gasifier steam-water system comprises two steam drums 11; in a heat exchange state, a steam drum 11 provides saturated water for the water-cooled walls of the gasification chamber 3 and the convection waste boiler 2 through a circulating pump 12; the other steam drum 11 provides saturated water for the water-cooled wall of the radiant syngas cooler 4 through natural circulation. In this embodiment, steam of different specifications can be produced by providing two steam drums 11, and of course, steam of the same specification can be produced.
In an embodiment, the gasifier steam-water system comprises three steam drums 11; in the heat exchange state, a steam drum 11 supplies saturated water to the water-cooled wall of the gasification chamber 3 through a circulating pump 12; a steam drum 11 supplies saturated water to the water-cooled wall and the water-cooled screen of the radiation waste boiler 4 through natural circulation; a drum 11 supplies saturated water to the water cooled walls of the convection waste boiler 2 through a circulation pump 12. In this embodiment, steam of different specifications can be produced by providing three steam drums 11.
In one embodiment, referring to fig. 1, the gasification chamber 3 is provided with a plurality of pulverized coal burners 13 at its side so that pulverized coal enters the gasification chamber 3 through the pulverized coal burners 13.
In one embodiment, referring to fig. 1, a fly ash burner 14 is disposed at the top of the gasification chamber 3, so that the fly ash and the gasifying agent enter the gasification chamber 3 through the fly ash burner 14 and are sufficiently mixed with the pulverized coal in the gasification chamber 3 to generate a high-temperature raw synthesis gas (i.e., a synthesis gas carrying fly ash and metallic alkali substances) and liquid slag.
In one embodiment, the slag bath chamber 5 is configured as a water bath environment to cool and solidify the liquid slag with chilled water and periodically discharge the liquid slag.
The working flow of the gasifier steam-water system is described in detail below with reference to fig. 1:
pulverized coal and an oxidant (such as oxygen and steam) enter the gasification chamber 3 through a pulverized coal burner 13, fly ash and the gasification agent enter the gasification chamber 3 through a fly ash burner 14, after being fully mixed in the gasification chamber 3, under high temperature and high pressure, oxygen deficient combustion is carried out to generate high temperature crude synthesis gas (namely, synthesis gas carrying fly ash and metal alkali substances) and liquid slag, and the slag falling from the radiation waste boiler 4 falls into the slag pool chamber 5 to be rapidly cooled and solidified after meeting cold water, and is periodically discharged.
After the saturated water flows out of the steam drum 11, a part of the saturated water is pressurized by a circulating pump 12, forced circulation is maintained, and the saturated water is divided into four strands of saturated water, namely a first strand of saturated water W1 to a fourth strand of saturated water W4, which respectively and correspondingly flow into the water cooling wall of the gasification chamber 3, the water cooling wall of the steering chamber 7, the water cooling wall of the gas conveying pipe 6 and the water cooling wall of the evaporator 10, after the water cooling wall flowing into the saturated water exchanges heat with the crude synthesis gas, the saturated water in the water cooling wall is continuously heated, and returns to the steam drum 11 in a saturated steam-water two-phase mode, and the circulation and the heat exchange process are finished. Further, the raw synthesis gas is cooled, flows out of the convection waste pot 2, and enters the subsequent process.
The other part of the saturated water flowing out of the steam drum 11 is taken as a fifth strand of saturated water W5 to directly flow into the water-cooled wall of the radiation waste boiler 4 in a natural circulation mode, namely, the saturated water does not need to be forcibly pressurized through the circulating pump 12, after heat exchange, the fifth strand of saturated water W5 returns to flow into the steam drum 11, and the circulation and heat exchange process is finished.
After the saturated water returning to the steam drum 11 in a saturated steam-water two-phase mode is separated in the steam drum 11, the saturated steam in the saturated steam flows out of the steam drum 11, enters the heat exchange tubes of the first section superheater 8 and the second section superheater 9 respectively in a first saturated steam V1 and a second saturated steam V2, and flows out of the first section superheater 8 and the second section superheater 9 in a first superheated steam V3 and a second superheated steam V4 mode after exchanging heat with the raw synthesis gas flowing through the first section superheater 8 and the second section superheater 9, and enters a subsequent power pipe network.
Through the above description, the gasifier steam-water system of the invention can provide saturated steam, superheated steam and the like meeting the requirements, and sufficiently and effectively recover the sensible heat of high-temperature gas.
Moreover, although illustrative embodiments have been described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of aspects across various embodiments), adaptations or alterations based on the present disclosure. The elements in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the specification or during the life of the application. Further, the steps of the disclosed methods may be modified in any manner, including by reordering steps or inserting or deleting steps. It is intended, therefore, that the description be regarded as examples only, with a true scope being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. Other embodiments may be utilized, for example, by one of ordinary skill in the art, upon reading the above description. Also, in the foregoing detailed description, various features may be combined together to simplify the present disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

Claims (10)

1. A gasifier soda system, characterized in that it includes: at least one steam drum, a gasification furnace, a gas pipe and a convection waste boiler which are communicated in sequence; wherein, the first and the second end of the pipe are connected with each other,
the gasification furnace includes: a gasification chamber, a radiation waste boiler and a slag pool chamber which are sequentially communicated from top to bottom;
the convection waste pot comprises: a turning chamber, a first-stage superheater, a second-stage superheater and an evaporator which are sequentially communicated from top to bottom so that the crude synthesis gas sequentially passes through and flows out of the convection waste boiler;
the radiation waste boiler is communicated with the steering chamber through the gas transmission pipe;
the steam drum is respectively communicated with the gasification chamber, the radiation waste boiler, the gas pipe and the steering chamber;
under the heat exchange state, the saturated water in the steam drum respectively flows into the water-cooled wall of the gasification chamber, the water-cooled wall of the radiation waste boiler, the water-cooled wall of the gas conveying pipe, the water-cooled wall of the steering chamber and the water-cooled wall of the evaporator, and circularly flows into the steam drum again; and saturated steam in the steam pocket respectively enters the heat exchange tube of the first section of superheater and the heat exchange tube of the second section of superheater and then is conveyed into a power pipe network.
2. The gasifier steam-water system of claim 1, further comprising a circulation pump; the steam pocket is respectively communicated with the water-cooled wall of the gasification chamber, the water-cooled wall of the gas conveying pipe, the water-cooled wall of the steering chamber and the water-cooled wall of the evaporator through the circulating pump;
and in the heat exchange state, the saturated water in the steam drum maintains the pressurization circulation through the circulating pump.
3. The gasifier soda system as claimed in claim 1, wherein the water-cooled wall of the gasification chamber, the water-cooled wall of the gas pipe and the water-cooled wall of the turn chamber are constructed in a coil-type water-cooled wall structure.
4. The gasifier steam-water system of claim 3, wherein the water-cooled walls of the radiant syngas cooler comprise an inner water-cooled wall, a water-cooled screen, and an outer water-cooled wall sequentially arranged in a direction close to the inner wall of the gasifier;
and under the heat exchange state, saturated water in the steam drum respectively enters the inner layer water-cooled wall, the water-cooled screen and the outer layer water-cooled wall.
5. The gasifier steam-water system of claim 1, wherein the water wall of the evaporator is configured as a coil-type water wall structure or a serpentine-type water wall structure.
6. The gasifier steam-water system of claim 1, comprising two steam drums; in the heat exchange state, wherein,
the steam drum provides saturated water for the gasification chamber and the water-cooled wall of the convection waste boiler through a circulating pump; and the other steam drum provides saturated water for the water-cooled wall of the radiation waste boiler through natural circulation.
7. The gasifier steam-water system of claim 1, comprising three steam drums; in the heat exchange state, wherein,
the steam drum provides saturated water for the water-cooled wall of the gasification chamber through a circulating pump;
the steam drum provides saturated water for the water-cooled wall and the water-cooled screen of the radiation waste boiler through natural circulation;
and the steam drum provides saturated water for the water-cooled wall of the convection waste boiler through a circulating pump.
8. The gasifier steam-water system of claim 1, wherein a plurality of pulverized coal burners are provided at a side of the gasification chamber such that pulverized coal enters the gasification chamber through the pulverized coal burners.
9. The gasifier steam-water system of claim 8, wherein a fly ash burner is disposed at the top of the gasification chamber, so that fly ash and gasifying agent enter the gasification chamber through the fly ash burner and are fully mixed with pulverized coal in the gasification chamber.
10. The gasifier soda system of claim 1, wherein the slag bath chamber is configured as a water bath environment to cool and solidify liquid slag with chilled water.
CN202110612994.2A 2021-06-02 2021-06-02 Gasification furnace steam-water system Pending CN115433611A (en)

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