CN113214873A - Dry coal powder entrained flow gasifier and dry coal powder gasification method - Google Patents
Dry coal powder entrained flow gasifier and dry coal powder gasification method Download PDFInfo
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- CN113214873A CN113214873A CN202110337646.9A CN202110337646A CN113214873A CN 113214873 A CN113214873 A CN 113214873A CN 202110337646 A CN202110337646 A CN 202110337646A CN 113214873 A CN113214873 A CN 113214873A
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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
- C10J3/48—Apparatus; Plants
- C10J3/485—Entrained flow gasifiers
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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
- C10J3/48—Apparatus; Plants
- C10J3/52—Ash-removing devices
- C10J3/526—Ash-removing devices for entrained flow gasifiers
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Abstract
The invention discloses a dry coal powder entrained flow gasifier and a dry coal powder gasification method, and relates to the technical field of coal chemical industry. The slag discharging section between the slag discharging port of the combustion chamber of the gasification furnace and the chilling ring below is improved and divided into two sections with different inner diameters, the slag discharging port and the chilling ring are ensured to be excessively connected through the arrangement of the second slag discharging section with larger inner diameter, the slag is prevented from scouring the chilling ring and the downcomer through the guiding of the slag discharging section, and the introduced steam is provided to further aggravate the transformation reaction place, so that the hydrogen content after the reaction is obviously improved, the device can adapt to the requirement of high hydrogen content in the downstream, and the device has a good industrial application prospect.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a dry coal powder entrained flow gasifier and a dry coal powder gasification method.
Background
In the clean and efficient utilization of coal, the coal gasification technology occupies a core position, and the dry coal powder pressurized entrained flow bed gasification technology becomes a mainstream technology for industrial operation due to the advantages of wide coal type adaptability, high gasification efficiency, superior environmental protection performance and the like. In the dry pulverized coal gasification technology operated in the coal gasification market, most of the gasification furnaces enter the gasification furnaces with less than 4% of moisture after pulverized coal is dried, although part of the gasification furnaces supplement steam (moisture) into the gasification furnaces through process burners, in order to ensure smooth reaction of the gasification furnaces, the supplement steam is little, for example, 2000-ton gasification furnaces, the supplement steam amount is less than 3 tons, the steam is mainly used for controlling a gasification reaction temperature field, and then shift reaction is increased, the highest hydrogen content in the effective gas after reaction is less than 28%, and devices (such as ammonia synthesis devices) which can not meet the synthesis requirement of high hydrogen content at the downstream can not be met.
In addition, the coal water slurry gasification process has strict requirements on coal, the coal quality with internal water higher than 8 percent and high coal quality deterioration degree (anthracite has low reaction activity and lignite has poor slurrying property), the pulping concentration is not improved, the coal water slurry gasification is not used, and the service life of a burner can be reduced.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a dry coal powder entrained flow gasifier, aiming at intensifying the depth of a shift reaction and obviously improving the content of hydrogen after the reaction.
The invention also aims to provide a dry coal powder gasification method, aiming at intensifying the transformation reaction depth and obviously improving the hydrogen content after the reaction by improving the structure of the slag discharging section.
The invention is realized by the following steps:
the invention provides a slag discharging section of a dry coal powder entrained flow gasifier, which comprises a gasifier combustion chamber, a chilling ring and a slag discharging section positioned between the gasifier combustion chamber and the chilling ring, wherein the slag discharging section comprises a first slag discharging section, a second slag discharging section with the inner diameter larger than that of the first slag discharging section and a steam injection assembly used for supplementing water vapor to the first slag discharging section or the second slag discharging section, the top of the first slag discharging section is connected with a slag discharging opening of the gasifier combustion chamber, the bottom of the first slag discharging section is connected with the top of the second slag discharging section, and the chilling ring is positioned at the bottom of the second slag discharging section.
The invention also provides a dry coal powder gasification method, which utilizes the dry coal powder entrained flow gasifier to carry out reaction.
The invention has the following beneficial effects: the inventor divides the lower slag section between the slag hole and the lower chilling ring of the gasification furnace combustion chamber into two sections with different inner diameters by improving the lower slag section, ensures the stepped excessive connection of the lower slag hole and the chilling ring on the one hand through the arrangement of the second lower slag section with larger inner diameter, prevents slag from scouring the chilling ring and a downcomer through the guide of the lower slag section, and on the other hand provides a place for further aggravating transformation reaction by introduced steam, obviously improves the hydrogen content after reaction, can adapt to the device with high hydrogen content requirement in the downstream, and has good industrial application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of an entrained-flow gasifier according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of the slag tapping section of FIG. 1;
FIG. 3 is a schematic view showing the structure of a entrained-flow gasifier in comparative example 1.
Icon: 100-entrained flow gasifier; 110-a gasifier combustion chamber; 111-gasifier burner; 112-slag discharging port; 120-slag discharging section; 121-a first lower slag section; 122-a second slagging section; 123-a steam injection assembly; 124-cooling coil; 130-quench ring; 140-downcomer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a dry coal powder entrained-flow gasifier 100, which includes a gasifier combustion chamber 110, a slag-discharging section 120, a quench ring 130, and a downcomer 140, which are arranged from top to bottom.
Specifically, the gasifier combustion chamber 110, the quench ring 130, and the downcomer 140 are conventional components of the entrained flow gasifier 100, the structure of which is the same as that of the prior art, and the specific structure and the working principle are not described in detail, and a plurality of gasifier burners 111 are disposed on the gasifier combustion chamber 110 for introducing reaction materials. The inner diameter of a slag discharging opening 112 of the gasification furnace combustion chamber 110 is slightly smaller than the inner diameter of the main body, and the upper part of the slag discharging opening 112 is conical.
The slag discharging section 120 of the dry coal powder entrained-flow gasifier 100 according to the embodiment of the present invention will be described in detail below.
Referring to fig. 1 and 2, the slag tapping section 120 includes a first slag tapping section 121, a second slag tapping section 122 having an inner diameter larger than that of the first slag tapping section 121, and a steam injection assembly for supplying steam to the first slag tapping section 121 or the second slag tapping section 122, wherein the top of the first slag tapping section 121 is connected to the slag tapping port 112 of the gasifier combustion chamber 110, the steam injection assembly is connected to the bottom of the first slag tapping section and the top of the second slag tapping section, and the quench ring 130 in the entrained flow gasifier 100 is located at the bottom of the second slag tapping section 122.
It is added that, in the conventional entrained-flow gasifier 100, there is only one section of the slag tapping pipe from the slag tapping port 112 of the gasifier combustion chamber 110 to the quench ring 130, and the slag tapping pipe is directly connected to the quench ring 130 or is in a conical transition to the quench ring 130.
The inventor introduces the second slag discharging section 122 with larger inner diameter, and continuously performs the transformation reaction in the second slag discharging section 122 through the water vapor to generate the hydrogen, so that the transformation reaction depth is increased, the hydrogen content after the reaction is obviously improved, the device can adapt to the downstream high hydrogen content requirement, and the device has good industrial application prospect.
The ratio of the inner diameters of the first slag tapping section and the second slag tapping section is preferably 1:1.2 to 1:1.8, in order to control the residence time within an optimum range. Preferably, the outer diameter of the first lower slag stage 121 is the same as the inner diameter of the slag tap 112 of the gasifier combustion chamber 110, and the outer diameter of the second lower slag stage 122 is the same as the inner diameter of the quench ring 130. The inventor finds that if the transition section is added between the first slag-discharging section 121 and the second slag-discharging section 122, the back-mixing phenomenon is not easy to generate, the shift reaction is not facilitated to be carried out, and meanwhile, the transition section has a guiding effect on slag in the slag-discharging section and is easy to wash and brush a chilling ring and a downcomer.
Further, the length of the second slag tapping section 122 in the slag tapping direction is more than 150 mm; preferably, the length of the second slag tapping section 122 is 500-800 mm. By further controlling the height of the second slag tapping section 122, the reaction time is guaranteed to control the depth of the shift reaction. If the height of the second slag tapping section 122 is too long, the process cost is greatly increased and is not easy to control; if the height of the second slag tapping section 122 is too short, the reaction time is insufficient, and the desired hydrogen content cannot be achieved.
Further, the steam injection assembly 123 comprises a steam injection inner ring and a steam injection outer ring, the steam injection assembly 123 is installed at the top of the second slag discharging section 122, the inner diameter of the steam injection assembly outer ring is the same as that of the second slag discharging section, a plurality of injection ports are arranged on the steam injection inner ring, and the injection direction of each injection port faces the second slag discharging section 122 and is injected downwards in a rotating manner; preferably, the included angle between the injection direction of each injection opening and the horizontal direction is 10-50 degrees, and each injection opening is provided with a swirl guide groove in the steam injection inner ring. A plurality of jet ports are uniformly distributed on the steam jet inner ring and rotatably enter the steam jet outer ring, and the steam jet outer ring and the annular gap of the second slag discharging section are obliquely and rotatably jetted downwards, so that the aim of jetting steam into the inner cavity of the second slag discharging section 122 from different angles can be fulfilled.
Specifically, the annular gap of the outer steam injection ring is flush with the inner edge of the second slag bear section 122, preventing solid material from washing out of the steam injection assembly 123. The steam injection assembly 123 has a differential pressure control valve at the inlet pipe to control the pressure of the steam injection. The inner diameter of the steam injection outer ring is parallel and level with the inner edge of the second slag discharging section 122, when the synthetic gas passes through the slag discharging section, the channel is smooth and free from blocking, the synthetic gas and ash residues are prevented from blocking and bonding, meanwhile, the synthetic gas and ash residues are prevented from being arranged by the steam injection assembly 123, the direction is changed, the downstream slag discharging section, the chilling ring 130 and the downcomer 140 (or a water-cooled wall waste boiler) are damaged, the steam uniformly rotates downwards along the gap outlet of the steam injection outer ring annular ring along the second slag discharging section 122, the steam is fully contacted with the synthetic gas due to low steam flow rate and rotation, the reaction time is also ensured, the conversion reaction depth is increased, and the hydrogen content in the effective gas can reach 40%.
In a preferred embodiment of the invention, the steam injection assembly further comprises an air inlet branch pipe, an air outlet of the air inlet branch pipe is communicated with an air inlet of the steam injection inner ring, and the number of the air inlet branch pipes is 2-16. The air inlet end of the air inlet branch pipe is connected with air supply equipment and is connected into a steam injection inner ring through the air inlet branch pipe, the steam injection inner ring is wrapped in a steam injection outer ring, a plurality of steam injection ports with swirl guide grooves are arranged in the steam injection inner ring and then reach a steam injection outer ring through the plurality of steam injection ports with swirl guide grooves, and finally the steam injection outer ring rotates out along the gap of the steam injection outer ring, so that the uniform feeding of the steam is realized.
In other embodiments, the structure of the steam injection assembly is not limited to the specific structure in the drawings, as long as it is sufficient to uniformly spray steam into the second slagging section 122. Further, the first lower slag stage 121 and the second lower slag stage 122 are both cooling coils 124. The cooling coil 124 is filled with cooling water to disperse the generated heat in time, so as to control the reaction temperature more precisely.
It should be added that the dry pulverized coal entrained-flow gasifier 100 provided by the embodiment of the present invention creates the best shift reaction conditions by providing the second slag chute 122 with a favorable residence time (i.e., reaction time) for the reaction. As the pipe diameter of the second slag discharging section 122 is enlarged and the matched chilling ring and the down pipe are enlarged, the chilling water is vaporized and upwards ascends after being sprayed out of the chilling ring, the transformation reaction is further increased within the range of more than 150mm (normally within the optimal range of 150mm-200 mm) upwards of the chilling ring, and the hydrogen content in the effective gas is greatly increased under the online safe, stable and long-period operation of the dry coal powder gasification process device.
In addition, the whole length of sediment section increases, and minimum latus rectum does not increase, and overall resistance increases to some extent, has aggravated gasification reaction dwell time, ensures the carbon standard ization rate, has improved the effective gas productivity, and hydrogen content is high in the effective gas, and overall resistance increase range is little, does not influence the system overall resistance and falls. Steam is supplemented into the second slag discharging section 122, and the whole temperature field of the second slag discharging section 122 is controlled, so that the medium circulation of the second slag discharging section 122 is smooth, the slag adhering and slag adhering stability of the second slag discharging section 122 are ensured, and the stable operation of the device in the whole length period is ensured, thereby improving the safety, stability and economy of the operation of the gasification furnace, ensuring the on-line operation rate of the device, and reducing the production cost of unit products.
The embodiment of the invention also provides a dry coal powder gasification method, which utilizes the dry coal powder entrained flow gasifier 100 to carry out reaction, utilizes the arrangement of the first slag discharging section 121 and the second slag discharging section 122 and is matched with the steam injection assembly 123, so that the conversion reaction depth is increased, and the hydrogen content after the reaction is improved.
Further, the temperature within the second slag tapping section 122 is greater than or equal to 800 ℃; preferably, the temperature within the second lower slag stage 122 is 800-. The temperature in the second slag tapping stage 122 is controlled to an optimum reaction temperature for the shift reaction to promote the shift reaction, at which the reaction can occur without a catalyst.
Further, the pressure of the steam adopted by the steam injection assembly is 5-10 MPa; the steam adopted by the steam injection assembly is saturated steam or superheated steam. The steam in the steam injection component 123 controls the pressure difference to be more than 0.2MPa through a pressure difference control valve, and the steam enters the inner ring of the steam injection component 123 through 2-16 branch pipes in a uniform distribution mode. The steam is supplemented by utilizing the differential pressure control of the steam and the gasification furnace, the phenomenon that the slag hanging of a coil pipe at a slag outlet is influenced or equipment is damaged due to the overlarge differential pressure steam flow is prevented, the steam temperature, the flow and the combustion temperature of the gasification furnace (according to an empirical formula and a methane content simulation temperature) and the gasification furnace load are normally adopted for comprehensive control, the temperature of mixed gas from a steam supplementing port to a chilling ring is ensured to be above 800 ℃, and the optimal reaction temperature is provided for shift reaction. The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a dry pulverized coal gasification method, which utilizes a dry pulverized coal entrained-flow bed gasification furnace 100 in fig. 1 to perform reaction, wherein the ratio of the inner diameters of a first slag discharging section and a second slag discharging section is 1:1.3, and the height of the second slag discharging section is 550 mm; the method comprises the following steps:
the gasification furnace is filled with chilling water in a chilling ring before ignition, the steam injection ring is filled with protective gas, the chilling water is controlled at constant flow rate, and the set value is controlled in stages before coal is put into the gasification furnace (2000 tons of coal gasification furnace is put into the gasification furnace, the chilling water is controlled at 500m3About/h), the protective gas of the steam injection ring is controlled according to the constant pressure difference, and after the coal feeding operation of the gasification furnace is stable, the steam injection ring gradually feeds saturated steam with the pressure of about 5.9 MPa; the protective gas is gradually withdrawn while the steam is fed in.
And after steam is introduced into the second slag discharging section, the temperature of the mixed steam and the synthetic gas is controlled to be about 1000 ℃.
The results show that: the hydrogen content is up to 31%.
Example 2
The present embodiment provides a method for gasifying dry pulverized coal, which is different from embodiment 1 only in that: the length of the second slag discharging section is prolonged, the gas retention space is further prolonged, the ratio of the inner diameters of the first slag discharging section and the second slag discharging section is 1:1.3, and the height of the second slag discharging section is 700 mm.
The results show that: the hydrogen content is up to 35%.
Example 3
The present embodiment provides a method for gasifying dry pulverized coal, which is different from embodiment 1 only in that: the inner diameter ratio of the second slag discharging section to the first slag discharging section is increased, the gas back mixing effect is intensified, the inner diameter ratio of the first slag discharging section to the second slag discharging section is 1:1.7, and the height of the second slag discharging section is 550 mm.
The results show that: the content of hydrogen is 34 percent at most
Example 4
The only difference from example 1 is that: the inner diameter ratio of the second slag discharging section to the first slag discharging section is increased, and the height of the second slag discharging section is also increased. The ratio of the inner diameters of the first slag discharging section and the second slag discharging section is 1:1.7, and the height of the second slag discharging section is 700 mm.
The results show that: the content of hydrogen is 39 percent at most
Example 5
The present embodiment provides a method for gasifying dry pulverized coal, which is different from embodiment 1 only in that: and after steam is introduced into the second slag discharging section, the temperature is controlled to be about 1200 ℃ after the steam and the synthesis gas are mixed.
The results show that: the content of hydrogen is up to 37 percent
Comparative example 1
The comparative example provides a dry pulverized coal gasification method, which adopts a conventional gasification furnace, and specifically, the specific structure of the conventional gasification furnace is shown in fig. 3, a slag discharging section is not arranged in a step manner with different diameters, a section of slag discharging section with the same diameter is arranged, and the tail end of the slag discharging section is provided with a conical transition pipe which is directly connected to a chilling ring; the method comprises the following steps:
the gasification furnace is filled with chilling water in a chilling ring before ignition, the chilling water is controlled at a fixed flow rate, and the set value is controlled in stages before coal is put into the gasification furnace (2000 ton per day coal gasification furnace, chilling water is controlled at 500 m)3About/h), no steam is added in the slag discharging section.
The results show that the hydrogen content is up to 23%.
Comparative example 2
The present comparative example provides a method for gasification of dry pulverized coal, which is different from example 1 only in that: the temperature of the second slag discharging section 122 is controlled to be 600 ℃. The results show that the hydrogen content is up to 28%.
Comparative example 3
The present comparative example provides a method for gasification of dry pulverized coal, which is different from example 1 only in that: the height of the second slag tapping section 122 is 400 mm.
The results show that the hydrogen content is at most 29%.
Test example 1
The hydrogen content after the reaction in examples 1-5 and comparative examples 1-3 was tested, the test method referring to QSNCC-J-05-2014-4025.
The results show that: the volume fraction of hydrogen in example 1 was 31%, the volume fraction of hydrogen in comparative example 1 was 23%, and the hydrogen content in example 1 was significantly increased compared to comparative example 1.
The volume fractions of hydrogen in comparative examples 2-3 were 28% and 29%, and the hydrogen content in example 1 was increased compared to comparative examples 2-3. The above embodiment has objective data, increases the back mixing and the retention space of the gas in the slag discharging section, aggravates the transformation reaction, and improves the hydrogen content by at least 5 percent, but because the water content in the dry coal powder gasification technology is limited, and the chilling water sprayed by the chilling ring is also limited to provide the slag discharging section, and provides the reactant of the transformation reaction, namely the water vapor, to the slag discharging section, the transformation reaction is obviously aggravated, and the hydrogen content is improved by about 10 percent.
In summary, the dry coal powder entrained-flow gasifier provided by the embodiment of the invention is divided into two sections with different inner diameters by improving the slag tapping section between the slag tapping hole of the gasifier combustion chamber and the chilling ring below, on one hand, the slag tapping hole is ensured to be excessively connected with the chilling ring step by arranging the second slag tapping section with larger inner diameter, slag is prevented from scouring the chilling ring and the downcomer through the guide of the slag tapping section, on the other hand, a place for further intensifying the shift reaction by introduced steam is provided, the hydrogen content after the reaction is remarkably improved, a device capable of adapting to the requirement of high hydrogen content in the downstream is provided, and the dry coal powder entrained-flow gasifier has a very good industrial application prospect.
According to the dry coal powder gasification method provided by the embodiment of the invention, the dry coal powder entrained flow gasifier is adopted for reaction, so that the conversion reaction depth is increased, and the hydrogen content after reaction is obviously improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The dry coal powder entrained-flow gasifier is characterized by comprising a gasifier combustion chamber, a chilling ring and a slag discharging section, wherein the slag discharging section is positioned between the gasifier combustion chamber and the chilling ring, the slag discharging section comprises a first slag discharging section, a second slag discharging section with the inner diameter larger than that of the first slag discharging section and a steam injection assembly used for supplementing water vapor for the first slag discharging section or the second slag discharging section, the top of the first slag discharging section is connected with a slag discharging opening of the gasifier combustion chamber, the bottom of the first slag discharging section is connected with the top of the second slag discharging section, and the chilling ring is positioned at the bottom of the second slag discharging section.
2. The dry pulverized coal entrained-flow gasifier as claimed in claim 1, wherein the ratio of the inner diameters of the first and second lower slag sections is 1:1.2 to 1: 1.8;
preferably, the outer diameter of the first lower slag section is the same as the inner diameter of a slag discharge opening of a combustion chamber of the gasification furnace, and the outer diameter of the second lower slag section is the same as the inner diameter of the chilling ring.
3. The dry coal powder entrained-flow gasifier of claim 2, wherein the length of the second slagging section in the slagging direction is greater than 150 mm;
preferably, the length of the second slag falling section is 500-800 mm.
4. The dry coal powder entrained-flow gasifier of claim 1, wherein the first lower slag section and the second lower slag section are both cooling coil structures.
5. The dry pulverized coal entrained-flow gasifier as claimed in claim 1, wherein the steam injection assembly comprises a steam injection inner ring and a steam injection outer ring, the steam injection assembly is connected to the bottom of the first lower slag section and the top of the second lower slag section, the inner diameter of the steam injection outer ring is the same as that of the second lower slag section, a plurality of injection ports are arranged on the steam injection inner ring, and the injection direction of each injection port is towards the inside of the second lower slag section and downwards;
preferably, the included angle between the injection direction of each injection opening and the horizontal direction is 10-50 degrees, and each injection opening is provided with a swirl guide groove in the steam injection inner ring.
6. The dry coal powder entrained-flow gasifier of claim 5, wherein the steam injection assembly further comprises an air inlet branch pipe, an air outlet of the air inlet branch pipe is communicated with an air inlet of the steam injection inner ring, and the number of the air inlet branch pipes is 2-16.
7. A method for gasification of dry pulverized coal, characterized in that it is reacted using the dry pulverized coal entrained-flow gasifier according to any one of claims 1 to 6.
8. A gasification process according to claim 7 wherein the temperature in the second slagging stage is greater than or equal to 800 ℃;
preferably, the temperature in the second slagging section is 800-.
9. The gasification process of claim 7, wherein the steam used by the steam injection assembly has a pressure of 5 to 10 MPa.
10. The gasification process of claim 9 wherein the steam used by the steam injection assembly is saturated steam or superheated steam; the pressure difference between the steam and the gasification furnace is more than or equal to 0.2 MPa.
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| CN203144351U (en) * | 2013-03-05 | 2013-08-21 | 上海锅炉厂有限公司 | Entrained-flow bed gasifying furnace with single nozzle |
| CN103627440A (en) * | 2013-11-11 | 2014-03-12 | 神华集团有限责任公司 | Rotational-flow dry coal powder gasifier |
| CN105255522A (en) * | 2015-10-15 | 2016-01-20 | 上海锅炉厂有限公司 | Chilling transformation and purification device for high-temperature gasification product and technological method adopting chilling transformation and purification device |
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