CN107418635B - Slag discharging system, fluidized bed gasification furnace and coal gasification slag discharging method - Google Patents
Slag discharging system, fluidized bed gasification furnace and coal gasification slag discharging method Download PDFInfo
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- CN107418635B CN107418635B CN201710624575.4A CN201710624575A CN107418635B CN 107418635 B CN107418635 B CN 107418635B CN 201710624575 A CN201710624575 A CN 201710624575A CN 107418635 B CN107418635 B CN 107418635B
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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
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Abstract
The invention relates to the technical field of coal gasification, in particular to a slag discharging system, a fluidized bed gasification furnace and a coal gasification slag discharging method. Can pulse the slagging when the slagging phenomenon appears, make the slagging become flexible and discharge through arrange sediment lock fill, be favorable to fluidized bed gasifier long-term stable operation. The embodiment of the invention provides a slag discharging system, which is applied to a fluidized bed gasification furnace and comprises: a slag discharge pipe connected with the gas distribution plate and communicated with the fluidized bed reaction zone and a slag discharge lock hopper communicated with a slag discharge port of the slag discharge pipe; the slag discharge pipe is provided with a back-blowing gas pipe, one end of the back-blowing gas pipe is used for introducing back-blowing gas, the other end of the back-blowing gas pipe extends into the fluidized bed reaction zone along the extension direction of the slag discharge pipe and is communicated with the fluidized bed reaction zone, the back-blowing gas pipe is used for introducing back-blowing gas into the fluidized bed reaction zone, and the back-blowing gas pipe pulsates slag in the fluidized bed reaction zone to enable the slag to be loosened and to be discharged into the slag discharge lock hopper side by. The embodiment of the invention is used for coal gasification slag discharge.
Description
Technical Field
The invention relates to the technical field of coal gasification, in particular to a slag discharging system, a fluidized bed gasification furnace and a coal gasification slag discharging method.
Background
Coal gasification refers to a process of generating methane and light tar-rich coal by reacting coal at high temperature and high pressure in a gasification furnace, and a large amount of high-temperature and high-pressure solid ash is generated in the process, and the generated solid ash needs to be discharged to the outside of the gasification furnace for subsequent treatment.
In the prior art, the fluidized bed gasification furnace has a structure as shown in fig. 1, and includes a gasification furnace 1 and a gas distribution plate 11 disposed at the bottom of the gasification furnace 1, a fluidized bed reaction zone a is disposed above the gas distribution plate 11, a slag discharge pipe 2 is connected to the bottom of the gas distribution plate 11, a slag discharge port of the slag discharge pipe 2 is communicated with a slag discharge lock hopper 3, when the fluidized bed gasification furnace is used for coal gasification reaction, a gasification agent (composed of steam, hydrogen and carbon monoxide) is generally conveyed into the fluidized bed reaction zone a through the gas distribution plate 11, and is subjected to coal gasification reaction with coal powder entering the fluidized bed reaction zone a at high temperature and high pressure to generate methane-rich raw coal gas and ash, and the generated ash is discharged into the slag discharge lock hopper 3 through the slag discharge pipe 2 and is discharged to the outside through the slag discharge lock hopper 3.
However, in the actual operation process of the fluidized bed gasification furnace, a slagging phenomenon often occurs, so that ash cannot be discharged, which is not favorable for the gasification process and the long-term stable operation of the fluidized bed gasification furnace.
Disclosure of Invention
The invention mainly aims to provide a slag discharging system, a fluidized bed gasification furnace and a coal gasification slag discharging method, which can pulsate the slagging to loosen the slagging and discharge the slagging through a slag discharging lock hopper when the slagging phenomenon occurs, and are beneficial to the long-term stable operation of the fluidized bed gasification furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, an embodiment of the present invention provides a slag discharging system, where the slag discharging system is applied to a fluidized bed gasifier, where the fluidized bed gasifier includes a gas distribution plate and a fluidized bed reaction region located above the gas distribution plate, and the slag discharging system includes:
the slag discharge pipe is connected with the gas distribution plate and communicated with the fluidized bed reaction zone, and the slag discharge lock hopper is communicated with a slag discharge port of the slag discharge pipe;
the slag discharging pipe is provided with a back blowing pipe, one end of the back blowing pipe is used for introducing back blowing gas, the other end of the back blowing pipe is arranged at the other end of the back blowing pipe, the extending direction of the slag discharging pipe stretches into the fluidized bed reaction area and is communicated with the fluidized bed reaction area, the back blowing pipe is used for introducing back blowing gas into the fluidized bed reaction area, and the back blowing pipe pulsates slag bonding in the fluidized bed reaction area, so that the slag bonding is loosened and discharged side by side in the slag discharging lock hopper.
Optionally, a plurality of air outlets are formed in the side wall of one end of the back blowing pipe extending into the fluidized bed reaction zone.
Optionally, the air outlet holes are uniformly distributed along the circumferential direction of the blowback gas pipe.
Optionally, the air outlet direction of the air outlet hole is inclined upwards.
Optionally, an included angle between the air outlet direction of the air outlet hole and the center line of the blowback pipe is gradually increased from top to bottom.
Optionally, an included angle between the air outlet direction of the air outlet hole with the lowest horizontal height on the blowback pipe and the center line of the blowback pipe is 40-60 degrees.
Optionally, the slag discharge lock hopper comprises at least two stages, and is sequentially communicated in series from top to bottom, the inlet of the first-stage slag discharge lock hopper is communicated with the slag discharge port of the slag discharge pipe, a first slag discharge valve is arranged between every two adjacent slag discharge lock hoppers, and a second slag discharge valve is arranged at the bottom of the last-stage slag discharge lock hopper.
Optionally, a pressurizing valve and a pressure release valve are arranged on the other slag discharging lock hoppers except the first-stage slag discharging lock hopper.
Optionally, inlets of every two adjacent stages of slag discharge lock hoppers are communicated through a balance pipe, and a balance valve is arranged on the balance pipe.
Optionally, a water inlet and a liquid level detector are arranged on the first-stage deslagging lock hopper.
Optionally, the slag discharge lock bucket comprises a first-stage slag discharge lock bucket and a second-stage slag discharge lock bucket, and the volume of the first-stage slag discharge lock bucket is less than or equal to that of the second-stage slag discharge lock bucket.
Optionally, the slag discharging system further comprises a control system, and the control system is electrically connected with the first slag discharging valve, the second slag discharging valve, the pressurizing valve, the pressure release valve, the balance valve and the liquid level detector respectively.
In another aspect, an embodiment of the present invention provides a fluidized bed gasification furnace, including:
the gasification furnace, the gas distribution plate arranged at the bottom of the gasification furnace and the slag discharge system are arranged.
In another aspect, an embodiment of the present invention provides a coal gasification slag tapping method applied to the above fluidized bed gasifier, including:
carrying out gasification reaction on coal in a gasification furnace to generate crude coal gas and ash, wherein the generated ash falls into the slag discharge lock hopper, and when a slagging phenomenon occurs in the fluidized bed reaction zone, back-flushing gas is introduced into the fluidized bed reaction zone to pulse slagging in the fluidized bed reaction zone so as to loosen the slagging and discharge the slagging to the slag discharge lock hopper;
and discharging the ash slag discharged into the slag discharge lock hopper through the slag discharge lock hopper.
Optionally, the back-flushing gas is introduced into the gasification furnace, and the slagging in the fluidized bed reaction zone is pulsed, so that the slagging loosening is performed and the slagging lock bucket is discharged side by side, and the method specifically comprises the following steps: and adjusting the pressure of the back blowing gas to be larger than the pressure in the gasification furnace, and continuously increasing the pressure difference between the pressure of the back blowing gas and the pressure in the gasification furnace so as to loosen the slagging and fall into the slagging lock hopper.
Optionally, the pressure difference between the pressure of the blowback gas and the pressure inside the gasification furnace is always less than or equal to 1/7 of the pressure inside the gasification furnace.
Optionally, when the slag discharge lock bucket comprises at least two stages, and the two stages are sequentially communicated in series from top to bottom, an inlet of the first-stage slag discharge lock bucket is communicated with a slag discharge port of the slag discharge pipe, a first slag discharge valve is arranged between every two adjacent slag discharge lock buckets, and a second slag discharge valve is arranged at the bottom of the last-stage slag discharge lock bucket;
discharge the lime-ash that will arrange to in the sediment lock fill through sediment lock fill specifically includes:
sequentially adjusting the pressure in each stage of slag discharging lock hopper except the first stage of slag discharging lock hopper from top to bottom, and opening a first slag discharging valve between each stage of slag discharging lock hopper and the last stage of slag discharging lock hopper step by step, so that the slag is discharged into each stage of slag discharging lock hopper step by step under the action of the pressure difference between the gasification furnace and each stage of slag discharging lock hopper;
and when the ash slag is discharged into the last-stage deslagging lock hopper, closing a first deslagging valve between the last-stage deslagging lock hopper and the last-stage deslagging lock hopper, and discharging the ash slag through the last-stage deslagging lock hopper.
Optionally, when the other slag discharge lock hoppers except the first-stage slag discharge lock hopper are provided with a pressurizing valve and a pressure relief valve;
sequentially adjusting the pressure in each stage of slag discharging lock hopper except the first stage of slag discharging lock hopper from top to bottom, and opening a first slag discharging valve between each stage of slag discharging lock hopper and the last stage of slag discharging lock hopper step by step, so that the slag is discharged into each stage of slag discharging lock hopper step by step under the action of the pressure difference between the gasification furnace and each stage of slag discharging lock hopper; the method comprises the following steps:
introducing gas into the ith-stage slag discharge lock hopper through a pressurizing valve, so that the pressure in the ith-stage slag discharge lock hopper is smaller than the pressure in the gasifier, opening a first slag discharge valve between the ith-stage slag discharge lock hopper and the last-stage slag discharge lock hopper, and continuously discharging the gas introduced into the ith-stage slag discharge lock hopper through a pressure release valve, so that the pressure in the gasifier and the pressure difference in the ith-stage slag discharge lock hopper are continuously increased progressively until ash slag is discharged into the ith-stage slag discharge lock hopper; wherein i is greater than or equal to 2.
Optionally, a difference between the pressure in the gasification furnace and the pressure in the ith-stage deslagging locking hopper is always less than or equal to 1/7 of the pressure in the gasification furnace.
Optionally, when the first-stage deslagging lock hopper is provided with a water inlet and a liquid level detector; the method further comprises the following steps: and filling water into the first-stage deslagging lock hopper, starting the liquid level detector, and judging whether slagging occurs in the gasification furnace or not according to a detection result of the liquid level detector.
The embodiment of the invention provides a slag discharging system, a fluidized bed gasification furnace and a coal gasification slag discharging method. The method overcomes the defect that the fluidized bed gasification furnace is difficult to stably operate for a long time because the ash can not be discharged when the slagging phenomenon occurs in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a schematic structural view of a fluidized bed gasification furnace provided in the prior art;
fig. 2 is a schematic structural diagram of a fluidized bed gasification furnace according to an embodiment of the present invention;
fig. 3 is a schematic structural view of another fluidized-bed gasification furnace according to an embodiment of the present invention;
FIG. 4 is an enlarged structural diagram of a region Q in FIG. 2 according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an air outlet direction of an air outlet according to an embodiment of the present invention;
fig. 6 is a schematic structural view of another fluidized-bed gasification furnace according to an embodiment of the present invention;
fig. 7 is a schematic structural view of another fluidized-bed gasification furnace according to an embodiment of the present invention;
fig. 8 is a schematic structural view of still another fluidized-bed gasification furnace according to an embodiment of the present invention;
wherein, the fluidized bed gasification furnace-1; a gas distribution plate-11; a fluidized bed reaction zone-A; a slag discharge pipe-2; a slag discharge lock hopper-3; a blowback gas pipe-4; a pressure regulating valve-f; a synthesis gas source-10; an air outlet-5; a first-stage deslagging lock hopper-31; a second-stage deslagging lock hopper-32; a first residual extraction valve-a; a second residual discharge valve-b; a pressure charging valve-c; a pressure relief valve-d; a balance pipe-6; a balancing valve-e; a water inlet-7; a liquid level detector-8; and a control system-9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In one aspect, an embodiment of the present invention provides a slag discharging system, referring to fig. 2, where the slag discharging system is applied to a fluidized bed gasification furnace 1, where the fluidized bed gasification furnace 1 includes a gas distribution plate 11 and a fluidized bed reaction region a located above the gas distribution plate 11, and the slag discharging system includes:
a slag discharge pipe 2 connected with the gas distribution plate 11 and communicated with the fluidized bed reaction zone A, and a slag discharge lock hopper 3 communicated with a slag discharge port of the slag discharge pipe 2;
arrange and be equipped with blowback gas pipe 4 on the sediment pipe 2, the one end of blowback gas pipe 4 is used for letting in the blowback gas, and the other end is followed the extending direction of sediment pipe 2 stretches into in the fluidized bed reaction zone A and with fluidized bed reaction zone A intercommunication, blowback gas pipe 4 be used for to fluidized bed reaction zone A lets in the blowback gas, right slagging scorification in the fluidized bed reaction zone A pulsates, makes the slagging scorification not hard up to side by side in arranging sediment lock fill 3.
It should be noted that, when the fluidized bed gasifier 1 is used for coal gasification reaction, the pulverized coal is introduced into the fluidized bed reaction zone a, and the gasifying agent is introduced into the fluidized bed reaction zone a from the gas distribution plate 11, so that the pulverized coal is subjected to coal gasification reaction under the fluidization action of the gasifying agent, therefore, the bottom of the fluidized bed reaction zone a, i.e., the connection between the gas distribution plate 11 and the slag discharge pipe 2, is the place with the largest diameter change, and the pulverized coal flows most easily and abnormally, so that slag and coke are most easily formed at the place.
The embodiment of the invention provides a slag discharging system, wherein a back-blowing gas pipe 4 is arranged, one end of the back-blowing gas pipe 4 extends into a fluidized bed reaction area A and is communicated with the fluidized bed reaction area A, when the bottom of the fluidized bed reaction area A has a slag bonding phenomenon, back-blowing gas with certain pressure is introduced into the fluidized bed reaction area A through the back-blowing gas pipe 4 to pulse the slag bonding in the fluidized bed reaction area A, so that the slag bonding is loosened and falls into a slag discharging lock hopper 3, the slag discharging lock hopper 3 is used for discharging, and the long-term stable operation of a fluidized bed gasification furnace 1 is facilitated. The method overcomes the defect that the fluidized bed gasification furnace is difficult to stably operate for a long time because the ash can not be discharged when the slagging phenomenon occurs in the prior art.
The back-blowing gas can be synthesis gas, inert gas, gas which does not react with the gasification agent and the raw material of the gasification furnace, or gas which can generate effective gas by reacting with the medium in the gasification furnace. Synthesis gas is preferred so as not to affect the atmosphere or the active components in the gasifier or to continue to separate the blow-back gas to remove gases that are not useful for subsequent processes.
When the back-blowing gas is syngas, referring to fig. 3, the inlet of the back-blowing gas pipe 4 may be communicated with the syngas source 10, and a pressure regulating valve f may be disposed on a pipeline through which the back-blowing gas pipe 4 is communicated with the syngas source 10, so that the syngas may be introduced into the fluidized bed reaction area a as the back-blowing gas at a certain pressure, thereby pulsing the slagging, avoiding introducing other impurities, and being unfavorable for the gasification reaction.
Wherein, the central line of the blowback gas pipe 4 can be coincided with the central line of the slag discharging pipe 2. Therefore, the back blowing gas can be blown into the fluidized bed reaction zone A along the center of the slag discharge pipe 2, so that the loosening of slag bonding is facilitated, and the smooth proceeding of normal slag discharge is facilitated.
In an embodiment of the present invention, referring to fig. 4, a plurality of air outlets 5 are formed on a side wall of one end of the blowback pipe 4 extending into the fluidized bed reaction zone a.
In the embodiment of the invention, the side wall of one end of the back blowing pipe 4 extending into the fluidized bed reaction zone A, which is higher than the joint of the slag discharge pipe 2 and the gas distribution plate 11, is provided with the gas outlet 5, so that the back blowing gas can be introduced into the bottom of the fluidized bed reaction zone A from all directions when the back blowing gas is introduced into the fluidized bed reaction zone A, the pulsation of slag bonding is enhanced, and the loosening of slag bonding is promoted.
In another embodiment of the present invention, the air outlets 5 are uniformly distributed along the circumference of the blowback air pipe 4. Therefore, the slagging at the bottom of the reaction zone A of the fluidized bed can be uniformly pulsed, and the pulsation effect is improved.
In practical applications, since the connection between the gas distribution plate 11 and the slag discharge pipe 2, i.e. the bottom of the fluidized bed reaction zone a, is an inverted triangle, it is preferable that, referring to fig. 5, the gas outlet direction of the gas outlet holes 5 (as indicated by arrows in fig. 5) is inclined upward. Therefore, the back blowing gas can pulse the slag bonding in the bottom area of the fluidized bed reaction area A, and the loosening and the discharge of the slag bonding in the inverted triangular area are facilitated.
In another preferred embodiment of the present invention, with reference to fig. 5, the angle between the air outlet direction of the air outlet hole and the centerline of the blowback pipe gradually increases from top to bottom. Therefore, the back blowing gas can pulse the fan-shaped area at the bottom of the fluidized bed reaction area A, and the omnibearing loosening of the slag bonding of the inverted triangle area is realized.
Furthermore, the included angle between the blowing direction of the blowing hole with the lowest horizontal height on the blowback pipe 4 and the center line of the blowback pipe 4 is 40-60 degrees. The method is suitable for the existing fluidized bed gasification furnace, and is beneficial to loosening and timely discharging the slag generated in the fluidized bed reaction zone A under the action of back flushing gas.
The specific structure of the slag discharge lock bucket 3 is not limited. As long as the ash can be continuously discharged while maintaining the pressure in the fluidized-bed gasification furnace 1.
In an embodiment of the present invention, referring to fig. 6, the slag discharging lock hopper 3 includes at least two stages, and is sequentially connected in series from top to bottom, an inlet of a first stage slag discharging lock hopper (31) is communicated with a slag discharging port of the slag discharging pipe 2, a first slag discharging valve a is disposed between every two adjacent stages of slag discharging lock hoppers (as shown, the first stage slag discharging lock hopper 31 and the second stage slag discharging lock hopper 32), and a second slag discharging valve b is disposed at the bottom of the last stage slag discharging lock hopper.
In the embodiment of the present invention, at least two stages of slag discharging lockers are connected in series, and the first slag discharging valve a is provided between each two adjacent stages of slag discharging lockers, so that when discharging ash into the slag discharging lockers 3, the first slag discharging valve a between the first stage slag discharging lockers 31 and the second stage slag discharging lockers 32 is closed, so that the ash is discharged into the first stage slag discharging lockers 31, and when discharging the ash through the slag discharging lockers 3, the second stage slag discharging lockers 32 may be charged so that the pressure in the second stage slag discharging lockers 32 is slightly smaller than the pressure in the fluidized bed gasification furnace 1, so that when opening the first slag discharging valve a, the ash may be discharged into the second stage slag discharging lockers 32 by the pressure difference between the fluidized bed gasification furnace 1 and the second stage slag discharging lockers 32, and then, in the first possible implementation manner, the first slag discharge valve a between the first-stage slag discharge lock hopper 31 and the second-stage slag discharge lock hopper 32 may be closed, the fluidized bed gasification furnace 1 and the second-stage slag discharge lock hopper 32 may be disconnected, the reaction pressure of the fluidized bed gasification furnace 1 may be maintained, and the ash slag may be discharged through the second-stage slag discharge lock hopper 32, or the ash slag discharged into the second-stage slag discharge lock hopper 32 may be discharged step by step into the last-stage slag discharge lock hopper, and the first slag discharge valve a between the last-stage slag discharge lock hopper and the last-stage slag discharge lock hopper may be closed, and the ash slag may be discharged through the second slag discharge valve b at the bottom of the last-stage slag discharge lock hopper. In a second possible implementation manner, the first slag discharging valve a between the first-stage slag discharging lock hopper 31 and the second-stage slag discharging lock hopper 32 may not be closed, and the pressure of each stage of slag discharging lock hopper is gradually increased to make the pressure in each stage of slag discharging lock hopper slightly smaller than the pressure in the fluidized bed gasification furnace 1, so that the ash slag is discharged into the last-stage slag discharging lock hopper step by step, and the second slag discharging valve b at the bottom of the last-stage slag discharging lock hopper is opened to discharge the ash slag by closing the first slag discharging valve a between the last-stage slag discharging lock hopper and the last-stage slag discharging lock hopper.
In an embodiment of the present invention, referring to fig. 7, the other slag discharging lockhoppers except the first-stage slag discharging lockhopper 31 are provided with a pressurizing valve c and a pressure relief valve d. Thus, when the slag is discharged through the slag discharge lock bucket 3, the corresponding slag discharge lock buckets of the respective stages may be pressurized by the pressurizing valve c so that the pressure in the fluidized bed gasification furnace 1 is slightly greater than the pressure in the slag discharge lock buckets of the respective stages, and the pressure relief valves d may be used to relieve the pressure in the slag discharge lock buckets of the respective stages, so that the pressure difference between the pressure in the fluidized bed gasification furnace 1 and the pressure in the slag discharge lock buckets of the respective stages may be gradually increased to discharge the slag to the slag discharge lock buckets of the respective stages under the pulsating action, and when the slag is discharged to the slag discharge lock bucket of the last stage and the first slag discharge valve a between the slag discharge lock bucket of the last stage and the slag discharge lock bucket of the last stage is closed, the pressure relief may be performed to the slag discharge lock bucket of the last stage so that the pressure in the slag discharge lock bucket of the last stage is close.
Furthermore, inlets of every two adjacent stages of slag discharge lock hoppers are communicated through a balance pipe 6, and a balance valve e is arranged on the balance pipe 6. Thus, when the slag is discharged through the slag discharge lock bucket 3, the pressure in the fluidized bed gasification furnace 1 is made to be slightly greater than the pressure in each stage of the slag discharge lock bucket by pressurizing each stage of the slag discharge lock bucket, and a differential pressure can be formed between the fluidized bed gasification furnace 1 and each stage of the slag discharge lock bucket by opening the balance valve e between each stage of the slag discharge lock bucket and the previous stage of the slag discharge lock bucket.
In another embodiment of the present invention, referring to fig. 8, the first stage slag discharge lock hopper 31 is provided with a water inlet 7 and a liquid level detector 8. By arranging the water inlet and the liquid level detector 8 on the first-stage slag discharge lock hopper 31, before the ash slag is discharged into the slag discharge lock hopper, the first-stage slag-discharge lock hopper 31 can be filled with water through the water inlet 7, so that, when ash falls into the slag-discharge lock hopper 3, the liquid level in the first-stage deslagging locking hopper 31 is detected by the liquid level detector 8, when the liquid level in the first-stage deslagging locking hopper 31 does not rise any more, the slagging phenomenon is shown, thereby being convenient for controlling the blowback gas pipe 4 to introduce blowback gas into the fluidized bed reaction area A and pulse the slag bonding in time to ensure smooth slag discharge, when the ash in the first-stage slagging lock hopper 31 is discharged into the second-stage slagging lock hopper 32, whether water and ash in the first-stage deslagging locking bucket 31 are completely discharged or not can be judged in time by detecting the liquid level in the first-stage deslagging locking bucket 31.
In an embodiment of the present invention, the slag discharging lock bucket 3 includes a first stage slag discharging lock bucket 31 and a second stage slag discharging lock bucket 32, and a volume of the first stage slag discharging lock bucket 31 is less than or equal to a volume of the second stage slag discharging lock bucket 32. In this way, when the ash is discharged into the first-stage slag lock hopper 31, since the volume of the first-stage slag lock hopper 31 is equal to or less than the volume of the second-stage slag lock hopper 32, the ash discharged into the first-stage slag lock hopper 31 can be prevented from having an excessive volume and blocking the communication pipe between the first-stage slag lock hopper 31 and the second-stage slag lock hopper 32 and the first slag discharge valve a.
Further, referring to fig. 8, the slag discharging system further includes a control system 9, and the control system 9 is electrically connected to the first slag discharging valve a, the second slag discharging valve b, the pressurizing valve c, the pressure releasing valve d, the balancing valve e, and the liquid level detector 8, respectively. Thus, when the ash needs to be discharged through the slag discharge lock bucket, the control system 9 can control the opening of the pressurizing valve c on the second-stage slag discharge lock bucket 31, and the gas is introduced into the second-stage slag discharge lock bucket 32, so that the pressure in the second-stage slagging lock hopper 32 is slightly less than the pressure in the gasifier, at this time, the first slag discharging valve a and the balance valve e between the second-stage slag discharging lock hopper and the first-stage slag discharging lock hopper 31 are controlled to be opened, a pressure difference is formed between the gasification furnace and the second-stage slag discharge lock hopper 32, then, a pressure release valve d on the second-stage slag discharge lock hopper 32 is controlled to open, the pressure in the second-stage slag discharge lock hopper 32 is gradually reduced, so that the pressure difference between the gasification furnace and the second-stage slag discharge lock hopper is gradually increased, pulsing the ash to loosen it and discharge it into the second stage row slag lock hopper 32; meanwhile, the liquid level detector 8 can be started to detect the liquid level height in the first-stage deslagging locking hopper 31 so as to judge whether slagging occurs in the fluidized bed reaction zone A or not and whether ash in the first-stage deslagging locking hopper 31 is completely discharged to the second-stage deslagging locking hopper 32 or not. In the process, automatic control can be realized through the control system 9, and manual errors are avoided.
Of course, the control system 9 can also be electrically connected to the pressure regulating valve f. In this way, when the liquid level detector 8 detects that the liquid level in the first-stage slagging lock hopper 31 does not rise any more, the liquid level detector 8 may send indication information to the control system 9, and the control system 9 may control the valve opening of the pressure regulating valve f according to the indication information to regulate the pressure of the back-blowing gas, so as to pulsate the slagging.
In another aspect, an embodiment of the present invention provides a fluidized bed gasification furnace, including:
the gasification furnace, the gas distribution plate arranged at the bottom of the gasification furnace and the slag discharge system are arranged.
The embodiment of the invention provides a fluidized bed gasification furnace, which adopts the slag discharge system, wherein the slag discharge system is provided with a back-blowing gas pipe through the slag discharge pipe, one end of the back-blowing gas pipe extends into the fluidized bed reaction region and is communicated with the fluidized bed reaction region, when the slag bonding phenomenon occurs at the bottom of the fluidized bed reaction region, back-blowing gas with certain pressure is introduced into the fluidized bed reaction region through the back-blowing gas pipe, and the slag bonding in the fluidized bed reaction region is pulsed to loosen the slag bonding and fall into the slag discharge lock hopper, so that the slag is discharged through the slag discharge lock hopper, and the fluidized bed gasification furnace can stably run for a long time. The method overcomes the defect that the fluidized bed gasification furnace is difficult to stably operate for a long time because the ash can not be discharged when the slagging phenomenon occurs in the prior art.
In another aspect, an embodiment of the present invention provides a coal gasification slag tapping method applied to the above fluidized bed gasifier, including:
carrying out gasification reaction on coal in a gasification furnace to generate crude coal gas and ash, wherein the generated ash falls into the slag discharge lock hopper, and when a slagging phenomenon occurs in the fluidized bed reaction zone, back-flushing gas is introduced into the fluidized bed reaction zone to pulse slagging in the fluidized bed reaction zone so as to loosen the slagging and discharge the slagging to the slag discharge lock hopper;
and discharging the ash slag discharged into the slag discharge lock hopper through the slag discharge lock hopper.
The embodiment of the invention provides a coal gasification slag discharging method, which is characterized in that coal is gasified, generated ash is discharged into a slag discharging lock hopper, and in the process of discharging the ash through the slag discharging lock hopper, when a slagging phenomenon occurs in a fluidized bed reaction region, back blowing gas with certain pressure is introduced into the fluidized bed reaction region to pulse slagging in the fluidized bed reaction region, so that slagging is loosened and falls into the slag discharging lock hopper, the phenomenon that the ash cannot be discharged due to the slagging phenomenon of a gasification furnace can be avoided, and the long-term stable operation of the fluidized bed gasification furnace is facilitated. The method overcomes the defect that the fluidized bed gasification furnace is difficult to stably operate for a long time because the ash can not be discharged when the slagging phenomenon occurs in the prior art.
The back-blowing gas can be synthetic gas, so that impurities cannot be introduced, and normal coal gasification reaction is facilitated.
In an embodiment of the present invention, the step of introducing a back-blowing gas into the fluidized bed reaction zone to loosen ash and drop the ash into the ash discharge lock hopper specifically comprises: and adjusting the pressure of the back-blowing gas to be more than or equal to the pressure in the gasification furnace, and continuously increasing the pressure difference between the pressure of the back-blowing gas and the pressure in the gasification furnace so as to loosen the ash and fall into the slag discharge lock hopper.
In the embodiment of the invention, the ash can be pulsed by adjusting the pressure of the back-blowing gas to be more than or equal to the pressure of the gasification furnace and continuously increasing the pressure difference between the pressure of the back-blowing gas and the pressure in the gasification furnace, so that the ash can be loosened and discharged under the condition that the pressure difference is continuously increased.
And the time interval of continuously increasing the pressure difference between the back-blowing gas and the gasifier is not limited. The pressure of the blowback gas can be increased at certain intervals, or at different intervals.
Illustratively, in the initial stage, the pressure of the back-blowing gas is adjusted to be equal to the pressure in the gasification furnace at intervals of 1 minute, the difference between the pressure of the back-blowing gas and the pressure of the gasification furnace is adjusted to be 1/30 of the pressure of the gasification furnace, and the difference between the pressure of the back-blowing gas and the pressure of the gasification furnace is adjusted to be 2/30 of the pressure of the gasification furnace at intervals of 1 minute, so that the circulation is continuously performed, and the slagging in the reaction zone of the fluidized bed is pulsated until the slagging in the reaction zone of the fluidized bed is discharged into the slagging lock hopper. Or the interval of 1 minute is firstly, the difference between the pressure of the back blowing gas and the pressure of the gasification furnace is adjusted to 1/30 of the pressure of the gasification furnace, if slag is loosened and falls into the slag discharge lock hopper, the interval of 2 minutes is then adjusted to 2/30 of the pressure of the gasification furnace. The specific interval time and the pressure difference can be determined according to the slagging condition.
In a preferred embodiment of the present invention, the pressure difference between the pressure of the blowback gas and the pressure inside the gasification furnace is always less than or equal to 1/7 of the pressure inside the gasification furnace. Experiments show that when the value is larger than the value, the bed layer in the furnace is possibly blown over, the reaction process is deteriorated, and the difficulty of process adjustment is increased.
In another embodiment of the present invention, when the slag discharging lock hopper comprises at least two stages, and the two stages are sequentially communicated in series from top to bottom, the inlet of the first stage slag discharging lock hopper is communicated with the slag discharging port of the slag discharging pipe, a first slag discharging valve is arranged between every two adjacent slag discharging lock hoppers, and a second slag discharging valve is arranged on the last slag discharging lock hopper;
discharge the lime-ash that will arrange to in the sediment lock fill through sediment lock fill specifically includes:
sequentially adjusting the pressure in each stage of slag discharging lock hopper except the first stage of slag discharging lock hopper from top to bottom, and opening a first slag discharging valve between each stage of slag discharging lock hopper and the last stage of slag discharging lock hopper step by step, so that the slag is discharged into each stage of slag discharging lock hopper step by step under the action of the pressure difference between the gasification furnace and each stage of slag discharging lock hopper;
and when the ash slag is discharged into the last-stage deslagging lock hopper, closing a first deslagging valve between the last-stage deslagging lock hopper and the last-stage deslagging lock hopper, and discharging the ash slag through the last-stage deslagging lock hopper.
Preferably, when the other slag discharge lock hoppers except the first-stage slag discharge lock hopper are provided with a pressurizing valve and a pressure relief valve;
sequentially adjusting the pressure in each stage of slag discharging lock hopper except the first stage of slag discharging lock hopper from top to bottom, and opening a first slag discharging valve between each stage of slag discharging lock hopper and the last stage of slag discharging lock hopper step by step, so that the slag is discharged into each stage of slag discharging lock hopper step by step under the action of the pressure difference between the gasification furnace and each stage of slag discharging lock hopper; the method comprises the following steps:
introducing gas into the ith-stage slag discharge lock hopper through a pressurizing valve, so that the pressure in the ith-stage slag discharge lock hopper is smaller than the pressure in the gasifier, opening a first slag discharge valve between the ith-stage slag discharge lock hopper and the last-stage slag discharge lock hopper, and continuously discharging the gas introduced into the ith-stage slag discharge lock hopper through a pressure release valve, so that the pressure in the gasifier and the pressure difference in the ith-stage slag discharge lock hopper are continuously increased progressively until ash slag is discharged into the ith-stage slag discharge lock hopper; wherein i is greater than or equal to 2.
In the embodiment of the invention, the gas pressure in the ith-stage deslagging lock hopper is adjusted, so that the pressure difference between the pressure in the gasification furnace and the pressure in the ith-stage deslagging lock hopper is continuously increased, the ash is pulsed, and the ash can be loosened under the condition that the pressure difference is continuously increased and can be discharged into the ith-stage deslagging lock hopper.
And the time interval of the continuous increasing of the pressure difference between the pressure in the gasification furnace and the pressure difference in the ith-stage deslagging lock hopper is not limited. The pressure in the ith stage slag discharge lock hopper can be reduced at certain intervals, and the pressure in the ith stage slag discharge lock hopper can also be reduced at different intervals.
Illustratively, in the initial stage, the pressure in the ith stage slag discharge lock hopper is increased, so that the pressure difference between the pressure in the gasifier and the pressure in the ith stage slag discharge lock hopper is equal to a first preset value, at intervals of 1 minute, part of gas in the ith stage slag discharge lock hopper is discharged through the pressure release valve, so that the pressure difference between the pressure in the gasifier and the pressure in the ith stage slag discharge lock hopper is increased to a second preset value, at intervals of 1 minute, the pressure between the pressure in the gasifier and the pressure difference in the ith stage slag discharge lock hopper is adjusted to be increased to a third preset value, and the circulation is continued so as to pulsate ash in the last stage slag discharge lock hopper until the ash is discharged into the ith stage slag discharge lock hopper. Or, the pressure release valve discharges part of gas in the ith-stage deslagging lock hopper at an interval of 1 minute, so that the pressure difference between the pressure of the gasification furnace and the pressure in the ith-stage deslagging lock hopper is increased to a second preset value, if slagging is loosened and falls into the deslagging lock hopper, the pressure of the gasification furnace and the pressure difference in the ith-stage deslagging lock hopper can be adjusted at an interval of 2 minutes to increase to a third preset value, and the specific interval time and the pressure difference can be determined according to the deslagging condition.
In a preferred embodiment of the present invention, the difference between the pressure in the gasifier and the pressure in the i-th stage slag discharge lock hopper is always equal to or less than 1/7 of the pressure in the gasifier. It has been found through experiments that when it is larger than this value, the difficulty of process adjustment is easily increased.
Further, when the first-stage deslagging lock hopper is provided with a water inlet and a liquid level detector;
the method further comprises the following steps: and filling water into the first-stage deslagging lock hopper, starting the liquid level detector, and judging whether slagging occurs in the gasification furnace or not according to a detection result of the liquid level detector.
Specifically, when ash and slag are discharged into the slag discharge lock hopper, if the liquid level detector detects that the liquid level in the first-stage slag discharge lock hopper does not rise any more, the phenomenon of slag bonding and coking in a fluidized bed reaction zone is indicated, and at this time, the slag bonding can be pulsed through the back-blowing gas until the pressure difference between the pressure of the back-blowing gas and the pressure in the gasification furnace is 1/7 of the pressure in the gasification furnace. Of course, when the ash discharged into the slag discharge lock hopper is discharged, under the condition that no slag is discharged, whether the ash in the first-stage slag discharge lock hopper is completely discharged can be judged according to the detection result of the liquid level detector. In the process, smooth slag discharge can be realized, and the safety of the system is improved, so that the fluidized bed gasification furnace can stably run for a long time.
In another embodiment of the present invention, when the slag discharging system further comprises a control system, the control system is electrically connected to the first slag discharging valve, the second slag discharging valve, the pressurizing valve, the pressure releasing valve, the balancing valve, the liquid level detector and the pressure regulating valve respectively,
the coal gasification slag discharging method specifically comprises the following steps:
carrying out gasification reaction on coal in a gasification furnace to generate crude gas and ash;
filling water into the first-stage deslagging lock hopper;
the generated ash falls into the first-stage slag-discharging lock hopper, the liquid level detector is controlled to be started through a control system, when the liquid level detector detects that the liquid level in the first-stage slag-discharging lock hopper does not rise any more, an indication signal is sent to the control system, the control system controls the pressure regulating valve to introduce back-blowing gas into the fluidized bed reaction zone according to the indication signal, and the slagging is pulsed until the pressure difference between the pressure of the back-blowing gas and the pressure in the gasification furnace is 1/7 of the pressure in the gasification furnace;
controlling a charging valve to open through the control system, introducing gas into a second-stage slag discharge lock hopper to enable the pressure difference between the pressure in the gasification furnace and the second-stage slag discharge lock hopper to be a preset value, controlling a balance valve to open through the control system to enable the pressure difference between the gasification furnace and the second-stage slag discharge lock hopper to be generated, and controlling a pressure release valve to open to discharge the gas in the second-stage slag discharge lock hopper so as to enable the pressure difference between the pressure in the gasification furnace and the second-stage slag discharge lock hopper to be continuously increased progressively until the pressure difference between the pressure in the gasification furnace and the second-stage slag discharge lock hopper is 1/7 of the pressure in the gasification furnace;
the process is circulated continuously until the ash slag is discharged into the last stage of slag discharging lock hopper;
and finally, controlling a first slag discharging valve between the last-stage slag discharging lock hopper and the last-stage slag discharging lock hopper to be closed and controlling a second slag discharging valve to be opened by the control system to discharge the ash to the outside.
Of course, before the control system controls the second slag discharge valve to be opened, the method may further include: and the control system controls the pressure release valve on the last-stage deslagging lock hopper to release pressure, so that the pressure in the last-stage deslagging lock hopper is equivalent to the external pressure. Thus, the slag can be discharged safely.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (16)
1. The utility model provides a slag discharging system, its characterized in that, slag discharging system is applied to fluidized bed gasifier, wherein, fluidized bed gasifier includes gas distribution board and is located the fluidized bed reaction zone of gas distribution board top, slag discharging system includes:
the slag discharge pipe is connected with the gas distribution plate and communicated with the fluidized bed reaction zone, and the slag discharge lock hopper is communicated with a slag discharge port of the slag discharge pipe;
the slag discharge pipe is provided with a back-blowing gas pipe, one end of the back-blowing gas pipe is used for introducing back-blowing gas, the other end of the back-blowing gas pipe extends into the fluidized bed reaction zone along the extension direction of the slag discharge pipe and is communicated with the fluidized bed reaction zone, and the back-blowing gas pipe is used for introducing back-blowing gas into the fluidized bed reaction zone to pulse the slag in the fluidized bed reaction zone so as to loosen the slag and arrange the slag into the slag discharge lock hopper;
a plurality of air outlets are formed in the side wall of one end, extending into the fluidized bed reaction zone, of the back blowing pipe;
the air outlet holes are uniformly distributed along the circumferential direction of the back-blowing air pipe;
the air outlet direction of the air outlet hole is inclined upwards;
and the included angle between the air outlet direction of the air outlet hole and the central line of the back-blowing air pipe is gradually increased from top to bottom.
2. The slag discharging system of claim 1, wherein an included angle between the air outlet direction of the air outlet hole with the lowest horizontal height on the blowback pipe and the center line of the blowback pipe is 40-60 degrees.
3. The slagging system according to claim 1,
the slag discharging lock bucket comprises at least two stages, and is sequentially communicated in series from top to bottom, the inlet of the first-stage slag discharging lock bucket is communicated with the slag discharging port of the slag discharging pipe, a first slag discharging valve is arranged between every two adjacent slag discharging lock buckets, and a second slag discharging valve is arranged at the bottom of the last-stage slag discharging lock bucket.
4. The slagging system according to claim 3,
and the other slag discharging lock hoppers except the first-stage slag discharging lock hopper are provided with a pressurizing valve and a pressure relief valve.
5. The slagging system according to claim 4,
the inlets of every two adjacent slag discharge lock hoppers are communicated through a balance pipe, and a balance valve is arranged on the balance pipe.
6. The slagging system according to claim 3,
and the first-stage deslagging lock hopper is provided with a water inlet and a liquid level detector.
7. The slagging system according to claim 3,
the slag discharging lock bucket comprises a first-stage slag discharging lock bucket and a second-stage slag discharging lock bucket, and the volume of the first-stage slag discharging lock bucket is less than or equal to that of the second-stage slag discharging lock bucket.
8. The slag extraction system according to any one of claims 3 to 7,
the slag discharging system further comprises a control system, and the control system is electrically connected with the first slag discharging valve, the second slag discharging valve, the pressurizing valve, the pressure release valve, the balance valve and the liquid level detector respectively.
9. A fluidized-bed gasification furnace, comprising:
a gasification furnace, a gas distribution plate arranged at the bottom of the gasification furnace and a slag discharge system according to any one of claims 1 to 8.
10. A coal gasification slag tapping method applied to the fluidized-bed gasification furnace according to claim 9, comprising:
carrying out gasification reaction on coal in a gasification furnace to generate crude coal gas and ash, wherein the generated ash falls into the slag discharge lock hopper, and when a slagging phenomenon occurs in the fluidized bed reaction zone, back-flushing gas is introduced into the fluidized bed reaction zone to pulse slagging in the fluidized bed reaction zone so as to loosen the slagging and discharge the slagging to the slag discharge lock hopper;
and discharging the ash slag discharged into the slag discharge lock hopper through the slag discharge lock hopper.
11. The coal gasification slag tapping method according to claim 10,
and introducing back-blowing gas into the fluidized bed reaction zone to pulsate the slag bonding in the fluidized bed reaction zone, so that the slag bonding is loosened and discharged to the slag discharging lock hopper, and the method specifically comprises the following steps: and adjusting the pressure of the back blowing gas to be larger than the pressure in the gasification furnace, and continuously increasing the pressure difference between the pressure of the back blowing gas and the pressure in the gasification furnace so as to loosen the slagging and fall into the slagging lock hopper.
12. The coal gasification slag tapping method according to claim 11,
the pressure difference between the pressure of the back blowing gas and the pressure in the gasification furnace is always less than or equal to 1/7 of the pressure in the gasification furnace.
13. The coal gasification slag tapping method according to claim 11,
when the slag discharging lock bucket comprises at least two stages, the two stages are sequentially communicated in series from top to bottom, the inlet of the first-stage slag discharging lock bucket is communicated with the slag discharging port of the slag discharging pipe, a first slag discharging valve is arranged between every two adjacent slag discharging lock buckets, and the bottom of the last-stage slag discharging lock bucket is provided with a second slag discharging valve;
discharge the lime-ash that will arrange to in the sediment lock fill through sediment lock fill specifically includes:
sequentially adjusting the pressure in each stage of slag discharging lock hopper except the first stage of slag discharging lock hopper from top to bottom, and opening a first slag discharging valve between each stage of slag discharging lock hopper and the last stage of slag discharging lock hopper step by step, so that the slag is discharged into each stage of slag discharging lock hopper step by step under the action of the pressure difference between the gasification furnace and each stage of slag discharging lock hopper;
and when the ash slag is discharged into the last-stage deslagging lock hopper, closing a first deslagging valve between the last-stage deslagging lock hopper and the last-stage deslagging lock hopper, and discharging the ash slag through the last-stage deslagging lock hopper.
14. The coal gasification slag tapping method according to claim 13, wherein when the remaining slag discharge lockhoppers except the first stage slag discharge lockhopper are provided with a pressure charging valve and a pressure relief valve;
sequentially adjusting the pressure in each stage of slag discharging lock hopper except the first stage of slag discharging lock hopper from top to bottom, and opening a first slag discharging valve between each stage of slag discharging lock hopper and the last stage of slag discharging lock hopper step by step, so that the slag is discharged into each stage of slag discharging lock hopper step by step under the action of the pressure difference between the gasification furnace and each stage of slag discharging lock hopper; the method comprises the following steps:
introducing gas into the ith-stage slag discharge lock hopper through a pressurizing valve, so that the pressure in the ith-stage slag discharge lock hopper is smaller than the pressure in the gasifier, opening a first slag discharge valve between the ith-stage slag discharge lock hopper and the last-stage slag discharge lock hopper, and continuously discharging the gas introduced into the ith-stage slag discharge lock hopper through a pressure release valve, so that the pressure in the gasifier and the pressure difference in the ith-stage slag discharge lock hopper are continuously increased progressively until ash slag is discharged into the ith-stage slag discharge lock hopper; wherein i is greater than or equal to 2.
15. The coal gasification slag tapping method according to claim 14,
the difference between the pressure in the gasification furnace and the pressure in the ith-stage deslagging locking hopper is always less than or equal to 1/7 of the pressure in the gasification furnace.
16. The coal gasification slag tapping method according to any one of claims 10-15, wherein when the first-stage slag tapping lock hopper is provided with a water inlet and a liquid level detector;
the method further comprises the following steps:
and filling water into the first-stage deslagging lock hopper, starting the liquid level detector, and judging whether slagging occurs in the gasification furnace or not according to a detection result of the liquid level detector.
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| CN110055111B (en) * | 2018-03-16 | 2024-04-05 | 新能能源有限公司 | Steady state slag discharging device for fluidized bed gasification furnace |
| CN111607433B (en) * | 2019-02-25 | 2021-04-30 | 新能能源有限公司 | Cooling and deslagging method for coal ash |
| CN111621335A (en) * | 2020-06-02 | 2020-09-04 | 新奥科技发展有限公司 | Coal catalytic gasification system |
| CN114672345A (en) * | 2020-12-27 | 2022-06-28 | 新疆宜化化工有限公司 | Blowing process and device for preventing coke residue deposition at furnace bottom of circulating fluidized bed coal gasifier |
| CN114130549B (en) * | 2021-11-29 | 2023-06-09 | 陕西精益化工有限公司 | Slag hole safety protection device of horizontal decanter centrifuge |
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| CN105485672A (en) * | 2015-12-24 | 2016-04-13 | 武汉凯迪工程技术研究总院有限公司 | Automatic residue poking method and device for wind distribution plate of biomass circulating fluidized bed boiler |
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| CN104421931A (en) * | 2013-08-19 | 2015-03-18 | 丁琦亮 | Automatic blockage dredging apparatus of cold slag machine slag feeding pipe |
| CN106010660A (en) * | 2016-05-13 | 2016-10-12 | 北京航天动力研究所 | Dry slag gasification device and method |
| CN106322371A (en) * | 2016-08-22 | 2017-01-11 | 中国能源建设集团湖南火电建设有限公司 | Anti-blocking method and device for dry type slag drainage system of biomass boiler |
| CN106675658B (en) * | 2016-12-15 | 2020-05-05 | 华北电力大学 | High-flux circulating fluidized bed low-order coal gasification device and method |
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