CN112592740A - Control method of gasification furnace - Google Patents
Control method of gasification furnace Download PDFInfo
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- CN112592740A CN112592740A CN202011431127.0A CN202011431127A CN112592740A CN 112592740 A CN112592740 A CN 112592740A CN 202011431127 A CN202011431127 A CN 202011431127A CN 112592740 A CN112592740 A CN 112592740A
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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
- C10J3/50—Fuel charging devices
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/723—Controlling or regulating the gasification process
Abstract
The application discloses control method of gasifier, gasifier have the nozzle, and the nozzle has from inside to the first oxygen passageway, first material passageway, second material passageway and the second oxygen passageway of establishing in proper order, and control method includes: step one, in the operation process of the gasification furnace, if the material is required to be stopped to be conveyed to any one of the first material channel and the second material channel, the conveying amount A0 of the first oxygen channel is kept unchanged, the conveying amount of the second oxygen channel is adjusted to D1 from D0, D1 is equal to D0 minus the amount of oxygen corresponding to the gasification of the material which is stopped in advance in the gasification system, and then the material is stopped to be conveyed to any one of the material channels within a preset time. The control method of the application enables the coal water slurry or the pulverized coal to exit the gasification furnace on line, so that the production system can stably run for a long period.
Description
Technical Field
The application relates to the technical field of gasification, in particular to a control method of a gasification furnace.
Background
The essence of the powder slurry gasification technology is that the slurry carbon-containing organic matter and the powder carbon-containing organic matter are sprayed into the gasification furnace simultaneously, so that the water entrainment is reduced, the concentration of the whole carbon-containing organic matter is indirectly improved, and the high-efficiency co-gasification of the slurry carbon-containing organic matter and the powder carbon-containing organic matter is realized. The existing slurry gasification process is divided into two types, namely single-nozzle slurry gasification and multi-nozzle slurry gasification, wherein the single-nozzle slurry gasification is that a multi-channel slurry combined burner is arranged at the top of a gasification furnace, and pulverized coal, coal water slurry and the gasification furnace are sprayed into the gasification furnace through the combined burner and carry out chemical reaction.
Chinese patent with application number CN201820984686.6 discloses a single nozzle slurry gasification furnace combined burner structure, and the gasification furnace needs to be wholly stopped when the problem of the coal slurry/pulverized coal system occurs in the process of operation of the burner with the structure at present, which seriously affects the long-period stable operation of the production system.
Content of application
The application provides a control method of a gasification furnace, which can enable a production system to stably operate for a long period.
In a first aspect, an embodiment of the present application provides a control method of a gasification furnace, where the gasification furnace has a burner, and the burner has a first oxygen channel, a first material channel, a second material channel, and a second oxygen channel, which are sequentially sleeved from inside to outside, and the control method includes: step one, in the operation process of the gasification furnace, if the material is required to be stopped to be conveyed to any one of the first material channel and the second material channel, the conveying amount A0 of the first oxygen channel is kept unchanged, the conveying amount of the second oxygen channel is adjusted to D1 from D0, D1 is equal to D0 minus the amount of oxygen corresponding to the gasification of the material which is stopped in advance in the gasification system, and then the material is stopped to be conveyed to any one of the material channels within a preset time.
In some embodiments, after stopping the material conveying to any material channel, the method further comprises: and step two, supplying inert gas and/or carbon dioxide gas into the material channel stopping conveying the materials within preset time. And step three, adjusting the conveying amount of the first oxygen channel to A1, and adjusting the conveying amount of the second oxygen channel to D2, wherein the sum of A1 and D2 is equal to the sum of A0 and D1.
In some embodiments, the first material passage is a coal water slurry passage and the second material passage is a pulverized coal passage.
In some embodiments, when the material in the first step is coal water slurry, the proportion of A1 in the sum of A1 and D2 in the third step is 5-30%. When any material in the first step is pulverized coal, the proportion of A1 in the sum of A1 and D2 in the third step is 18-25%.
In some embodiments, in the first step, the stop amount of the pre-stop material conveying and the conveying amount of the corresponding second oxygen channel are reduced in two stages of 70-75% and 40-50%.
In some of these embodiments, after adjusting the delivery amount of the first oxygen channel to a1 and the delivery amount of the second oxygen channel to D2, further comprising: and step four, adjusting the conveying amount of the material channel for conveying the materials all the time to C1, adjusting the conveying amount of the first oxygen channel to A2, adjusting the conveying amount of the second oxygen channel to D3, wherein the ratio of the sum of A2 and D3 to C1 is equal to the oxygen-coal ratio corresponding to the gasification of the materials all the time conveyed in the gasification system. And when any material in the step one is coal water slurry, the proportion of A2 in the sum of A2 and D3 is 5-30%. When any material in the first step is pulverized coal, the proportion of A2 in the sum of A2 and D3 is 18-25%.
In a second aspect, an embodiment of the present application provides a control method of a gasification furnace, where the gasification furnace has a burner, and the burner has a first oxygen channel, a first material channel, a second material channel, and a second oxygen channel, which are sequentially sleeved from inside to outside, and the control method includes: step one, in the operation process of the gasification furnace, when any one of a first material channel and a second material channel conveys materials according to the conveying amount G0, and the other material channel conveys inert gases and/or carbon dioxide gases, if the materials are required to be conveyed to the other material channel, the conveying amount of a first oxygen channel is adjusted from E0 to E1, the conveying amount of a second oxygen channel is adjusted from H0 to H1, E1 is the conveying amount of the first oxygen channel when the materials are conveyed to both the first material channel and the other material channel in the gasification system, the sum of E1 and H1 is equal to the sum of E0 and H0, then the conveying of the inert gases and/or the carbon dioxide gases to the other material channel is stopped, and then the materials are conveyed to the other material channel according to the conveying amount F0 within a preset time.
In some embodiments, when the material is conveyed to another material channel according to the conveying amount F0, the conveying amount of the second oxygen channel is adjusted to be H2, and the ratio of H2 to F0 is equal to the oxygen-coal ratio corresponding to the gasification of the material which is conveyed in advance in the gasification system.
In some embodiments, the first material passage is a coal water slurry passage and the second material passage is a pulverized coal passage.
In some embodiments, before the conveying amount of the first oxygen channel is adjusted from E0 to E1 and the conveying amount of the second oxygen channel is adjusted from H0 to H1, so that G0 is the conveying amount of the other material channel when any material channel and the other material channel in the gasification system convey materials, and the ratio of the sum of E0 and H0 to G0 is equal to the oxygen-coal ratio corresponding to the gasification of the other material in the gasification system. And when the other material in the first step is coal water slurry, the proportion of E0 to E0 in H0 is 5-30%. When the other material in the first step is pulverized coal, the proportion of E0 to E0 in H0 is 18-25%.
According to the control method of the gasification furnace provided by the embodiment of the application, the gasification furnace is provided with a burner, the burner is provided with a first oxygen channel, a first material channel, a second material channel and a second oxygen channel which are sequentially sleeved from inside to outside, and the control method comprises the following steps: in the operation process of the gasification furnace, if the material is required to be stopped being conveyed to any one of the first material channel and the second material channel, the conveying amount A0 of the first oxygen channel is kept unchanged, the conveying amount of the second oxygen channel is adjusted to D1 from D0, D1 is equal to D0 minus the amount of oxygen corresponding to the gasification of the material which is stopped in advance in the gasification system, and then the material is stopped being conveyed to any one material channel within a preset time. In the operation process of the gasification furnace, when the coal water slurry system and the pulverized coal system have problems and need to be overhauled, the coal water slurry or the pulverized coal can exit the gasification furnace on line by adopting the control method, and the stability of parameters such as pressure, temperature and the like in the gasification furnace is maintained by adjusting the oxygen amount of the first oxygen channel, the oxygen amount of the second oxygen channel and the like, so that the stable operation of the gasification furnace is realized, and the long-period stable operation of the production system is further realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a burner in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the related art, a coal water slurry system for supplying coal water slurry and a pulverized coal system for supplying pulverized coal are provided upstream of the gasifier. The above gasification furnace has the following problems: in the operation process of the gasification furnace, when the coal water slurry system and the pulverized coal system have problems and need to be overhauled, the gasification furnace needs to be integrally stopped, so that when the gasification furnace is restarted, the time consumption is long in the processes of material withdrawal and input, the energy consumption for re-rising after the temperature in the gasification furnace is completely cooled is high, the production system needs to be adjusted again, and the long-period stable operation of the production system is influenced.
In order to solve the above problems, embodiments of the present application provide a method for controlling a gasifier. Referring to fig. 1, the gasification furnace has a burner 1, and the burner 1 has a first oxygen channel 10, a first material channel 20, a second material channel 30 and a second oxygen channel 40, which are sequentially sleeved from inside to outside. The first material may be coal water slurry, and at this time, the first material passage 20 is recorded as a coal water slurry passage. The second material may be pulverized coal, and in this case, the second material passage 30 is referred to as a pulverized coal passage. The ratio of the pulverized coal gasified by the powder slurry of the gasification furnace can be 0.50-0.65Nm 3/kg. The amount of oxygen delivered by the first oxygen passage 10 may be 10-15% of the total oxygen amount of the gasification furnace.
Example I Online withdrawal of coal-water slurry
The embodiment provides a control method of a gasification furnace, which comprises the following steps: step one, in the operation process of the gasification furnace, if the coal water slurry is required to be stopped being conveyed to the coal water slurry channel, the conveying amount A0 ' of the first oxygen channel 10 is kept unchanged, the conveying amount of the second oxygen channel 40 is adjusted to D1 ' from D0 ', the D1 ' is equal to D0 ' minus the oxygen amount corresponding to the gasification of the coal water slurry in the gasification system, and then the coal water slurry is stopped being conveyed to the coal water slurry channel within the preset time. The preset time may be 1-3 seconds. By reducing the oxygen delivery amount before stopping delivering the coal water slurry, the overtemperature caused by excessive oxygen in the gasification furnace is avoided.
In the first step, the stopping amount of the coal water slurry and the conveying amount of the corresponding second oxygen channel 40 are reduced according to two stages of 70-75% and 40-50% so as to reduce the operation load of withdrawing the materials and enable the material withdrawing process to be more stable.
After the coal water slurry is stopped being conveyed to the coal water slurry channel, the method also comprises the following steps: and step two, supplying inert gas and/or carbon dioxide gas into the coal water slurry channel within preset time. Wherein, the preset time can be 3 seconds. The inert gas may be nitrogen. The carbon dioxide gas can participate in the gasification reaction in the furnace, and the components of the synthesis gas are improved while the temperature in the furnace is controlled. By supplying inert gas and/or carbon dioxide gas, the burner 1 is protected, and safety accidents caused by the fact that high-temperature synthesis gas, oxygen or coal particles enter a coal water slurry channel are prevented.
After the inert gas and/or the carbon dioxide gas are supplied to the coal-water slurry channel stopping delivering the coal-water slurry, the method can further comprise the following steps: and step three, the conveying amount of the first oxygen channel 10 is adjusted to A1 ', the conveying amount of the second oxygen channel 40 is adjusted to D2', and the sum of A1 'and D2' is equal to the sum of A0 'and D1'. Optionally, the sum of a1 ' and D2 ' and a1 ' is 5% -30%. Wherein, set up the proportion of accounting for of A1 'to 5% -30% reason in that, the coal slurry system withdraws from the back, the oxygen of first oxygen passageway 10 can increase the dispersion effect of fine coal when keeping in above-mentioned within range, avoids reaction zone apart from nozzle 1 near damage nozzle 1 to the certain distance with fine coal propelling movement simultaneously, and has still avoided oxygen because the momentum is great with fine coal propelling movement to the position far away from nozzle 1 export, causes the problem of gasification reaction's effective space reduction.
After adjusting the delivery amount of the first oxygen passage 10 to a1 'and the delivery amount of the second oxygen passage 40 to D2', it may further include: step four, the conveying capacity of the pulverized coal channel is adjusted from C0 'to C1', the conveying capacity of the first oxygen channel 10 is adjusted to A2 ', the conveying capacity of the second oxygen channel 40 is adjusted to D3', the difference value between C1 'and C0' is equal to the material conveying capacity of any material channel when the material conveying is not stopped, the ratio of the sum of A2 'and D3' to C1 'is equal to the oxygen-coal ratio corresponding to the pulverized coal gasification in the gasification system, and the ratio of the sum of A2' and D3 'to A2' is 5% -30%. Wherein, the oxygen-coal ratio corresponding to the pulverized coal gasification can be 0.45-0.55Nm3/kg, and the oxygen-coal ratio corresponding to the coal-water slurry gasification can be 0.55-0.70Nm 3/kg. The steps avoid long stopping time of withdrawing the material system, and avoid the difficulty of operating and adjusting the downstream system due to the increased load fluctuation of the gasification furnace.
Under the following conditions:
the coal feeding amount of the gasification furnace is 1500t/d, wherein the coal water slurry feeding amount is 500t/d, and the pulverized coal feeding amount is 1000 t/d. The total oxygen amount was 37500Nm3/h, wherein the oxygen amount of the first oxygen passage 10 was 4500Nm3/h (12% by weight). The ratio of pulverized coal to gasified oxygen to coal was 0.6Nm 3/kg.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the gasification of the coal-water slurry) of the coal-water slurry system is 0.65Nm3/kg, and the oxygen amount corresponding to the gasification of the coal-water slurry is 27083Nm 3/h.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the coal gasification of the pulverized coal) of the pulverized coal system in independent operation is 0.50Nm3/kg, and the oxygen amount corresponding to the coal gasification of the pulverized coal is 10417Nm 3/h.
The control method may include the steps of:
step one, keeping the oxygen amount 4500Nm3/h of the first oxygen passage 10 unchanged, and subtracting the oxygen amount 27083Nm3/h corresponding to the coal water slurry from the second oxygen passage 40;
step two, stopping water coal slurry in the coal water slurry channel after 1-3S, and introducing carbon dioxide gas into the coal water slurry channel after 3S;
and step three, reducing the oxygen amount 4500-.
In the operation process of the gasification furnace, when the coal water slurry system has problems and needs to be overhauled, the coal water slurry can exit the gasification furnace on line by adopting the control method of the embodiment, and the stability of parameters such as pressure, temperature and the like in the gasification furnace is maintained by adjusting the oxygen amount of the first oxygen channel, the oxygen amount of the second oxygen channel and the like, so that the stable operation of the gasification furnace is realized, and the long-period stable operation of the production system is realized.
EXAMPLE II Online charging of coal-Water slurry
The embodiment provides a control method of a gasification furnace, which comprises the following steps: step one, in the operation process of the gasification furnace, when the pulverized coal is conveyed to the pulverized coal channel according to the conveying quantity G0 ', and the inert gas and/or the carbon dioxide gas are conveyed to the coal water channel, if the coal water is required to be conveyed to the coal water channel, the conveying quantity of the first oxygen channel 10 is adjusted from E0 ' to E1 ', the conveying quantity of the second oxygen channel 40 is adjusted from H0 ' to H1 ', E1 ' is the conveying quantity of the first oxygen channel 10 when any material channel and the other material channel in the gasification system convey materials, the sum of E1 ' and H1 ' is equal to the sum of E0 ' and H0 ', then the conveying of the inert gas and/or the carbon dioxide gas to the coal water channel is stopped, and then the coal water is conveyed to the coal water channel according to the conveying quantity F0 ' within a preset time. Wherein, E0 'may be equal to a 1' in the first embodiment, and E1 'may be equal to a 0' in the first embodiment. H0 'may be equal to D2' in embodiment one. The preset time may be 3 s.
When the coal water slurry is conveyed to the coal water slurry channel according to the conveying amount F0 ', the conveying amount of the second oxygen channel 40 can be adjusted to be H2 ', and the ratio of H2 to F0 ' is equal to the oxygen-coal ratio corresponding to the gasification of the coal water slurry in the gasification system.
Optionally, before the conveying amount of the first oxygen channel 10 is adjusted from E0 'to E1' and the conveying amount of the second oxygen channel 40 is adjusted from H0 'to H1', the conveying amount of the other material channel is adjusted when any material channel and the other material channel in the gasification system convey materials, G0 'is the conveying amount of the other material channel, and the ratio of the sum of E0' and H0 'to G0' is equal to the oxygen-coal ratio corresponding to the gasification of the other material in the gasification system. Optionally, the ratio of E0 ' to E0 ' in H0 ' is 5% -30%.
Under the following conditions:
the coal feeding amount of the gasification furnace is 1500t/d, wherein the coal water slurry feeding amount is 500t/d, and the pulverized coal feeding amount is 1000 t/d. The total oxygen amount was 37500Nm3/h, wherein the oxygen amount of the first oxygen passage 10 was 4500Nm3/h (12% by weight). The ratio of pulverized coal to gasified oxygen to coal was 0.6Nm 3/kg.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the gasification of the coal-water slurry) of the coal-water slurry system is 0.65Nm3/kg, and the oxygen amount corresponding to the gasification of the coal-water slurry is 27083Nm 3/h.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the coal gasification of the pulverized coal) of the pulverized coal system in independent operation is 0.50Nm3/kg, and the oxygen amount corresponding to the coal gasification of the pulverized coal is 10417Nm 3/h.
The control method may include the steps of:
in step one, the oxygen amount in the first oxygen passage 10 is increased from 2083Nm3/h to 4500Nm3/h, and the oxygen amount in the second oxygen passage 40 is reduced 2417Nm3/h, so that the total oxygen amount is kept unchanged.
And step two, stopping injecting the carbon dioxide gas in the water-coal-slurry channel.
And step three, after 3S, feeding the coal water slurry system, and meanwhile, increasing the oxygen amount 27083Nm3/h of the second oxygen channel 40 according to the oxygen-coal ratio of 0.65Nm 3/kg.
In the operation process of the gasification furnace with the withdrawn coal water slurry, when the problems of the coal water slurry system are solved and can be put into use, the coal water slurry can be put into the gasification furnace on line by adopting the control method of the embodiment, and the parameters such as pressure, temperature and the like in the gasification furnace are maintained to be stable by adjusting the oxygen amount of the first oxygen channel, the oxygen amount of the second oxygen channel and the like, so that the stable operation of the gasification furnace is realized, and the long-period stable operation of the production system is realized.
EXAMPLE three on-line Exit of pulverized coal
The embodiment provides a control method of a gasification furnace, which comprises the following steps: step one, in the operation process of the gasification furnace, if the pulverized coal is required to be stopped being conveyed to the pulverized coal channel, the conveying quantity A0 'of the first oxygen channel 10 is kept unchanged, the conveying quantity of the second oxygen channel 40 is adjusted to D1 from D0', the D1 'is equal to D0' minus the oxygen quantity corresponding to the gasification of the pulverized coal quantity in the gasification system, and then the pulverized coal is stopped being conveyed to the pulverized coal channel within the preset time. The preset time may be 1-3 seconds. By reducing the oxygen delivery rate before stopping the delivery of pulverized coal, excessive oxygen in the gasifier causing excessive temperatures is avoided.
In the first step, the stopping amount of the pulverized coal and the conveying amount of the second oxygen channel 40 corresponding to the stopping amount of the pulverized coal are reduced according to two stages of 70-75% and 40-50% so as to reduce the operation load of exiting the material and enable the material exiting process to be more stable.
After stopping conveying the pulverized coal to the pulverized coal channel, the method may further include: and step two, supplying inert gas and/or carbon dioxide gas into the pulverized coal channel within preset time. Wherein, the preset time can be 3 seconds. The inert gas may be nitrogen. The carbon dioxide gas can participate in the gasification reaction in the furnace, and the components of the synthesis gas are improved while the temperature in the furnace is controlled. By supplying inert gas and/or carbon dioxide gas, the burner 1 is protected, and safety accidents caused by high-temperature synthesis gas, oxygen or coal particles entering a pulverized coal channel are prevented.
After supplying the inert gas and/or the carbon dioxide gas into the pulverized coal channel for stopping conveying the pulverized coal, the method can further comprise the following steps: and step three, adjusting the conveying amount of the first oxygen channel 10 to A1 ", adjusting the conveying amount of the second oxygen channel 40 to D2", wherein the sum of A1 "and D2" is equal to the sum of A0 "and D1". Optionally, the sum of a1 "and D2" and a1 "is 18% -25%. The reason why the proportion of A1' is set to 18% -25% is that when the pulverized coal system exits, the oxygen content in the second oxygen channel 40 is reduced, the speed is slowed down, if the original oxygen distribution is adopted, the cutting force to the coal water slurry is insufficient, the atomization of the coal water slurry at the outlet of the burner 1 does not sufficiently influence the gasification efficiency, in order to solve the problems, the preliminary atomization effect of the coal water slurry can be greatly increased in the premixing cavity at the head of the burner 1 by increasing the oxygen proportion of the first oxygen channel 10 on the premise of keeping the total oxygen content unchanged, and then the sufficient atomization is realized under the cutting of the oxygen of the second oxygen channel 40.
After adjusting the delivery amount of the first oxygen passage 10 to a1 "and the delivery amount of the second oxygen passage 40 to D2", it may further include: and step four, adjusting the conveying amount of the coal water slurry channel from C0 'to C1', adjusting the conveying amount of the first oxygen channel 10 to A2 ', adjusting the conveying amount of the second oxygen channel 40 to D3', wherein the difference between C1 'and C0' is equal to the material conveying amount of any material channel when the material conveying is not stopped, the ratio of the sum of A2 'and D3' to C1 'is equal to the oxygen-coal ratio corresponding to the gasification of the coal water slurry in the gasification system, and the proportion of A2' in the sum of A2 'and D3' can be 18% -25%. The oxygen-coal ratio for coal water slurry gasification can be 0.55-0.70Nm3/kg, and the oxygen-coal ratio for pulverized coal gasification can be 0.45-0.55Nm 3/kg. The steps avoid long stopping time of withdrawing the material system, and avoid the difficulty of operating and adjusting the downstream system due to the increased load fluctuation of the gasification furnace.
Under the following conditions:
the coal feeding amount of the gasification furnace is 1500t/d, wherein the coal water slurry feeding amount is 500t/d, and the pulverized coal feeding amount is 1000 t/d. The total oxygen amount was 37500Nm3/h, wherein the oxygen amount of the first oxygen passage 10 was 4500Nm3/h (12% by weight). The ratio of pulverized coal to gasified oxygen to coal was 0.6Nm 3/kg.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the gasification of the coal-water slurry) of the coal-water slurry system is 0.65Nm3/kg, and the oxygen amount corresponding to the gasification of the coal-water slurry is 27083Nm 3/h.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the coal gasification of the pulverized coal) of the pulverized coal system in independent operation is 0.50Nm3/kg, and the oxygen amount corresponding to the coal gasification of the pulverized coal is 10417Nm 3/h.
The control method may include the steps of:
the method comprises the following steps: keeping the oxygen amount 4500Nm3/h of the first oxygen passage 10 unchanged, reducing the powder feeding amount by two times, firstly reducing the powder feeding amount to 350t/d, secondly reducing the powder feeding amount to 200t/d, and simultaneously subtracting the corresponding oxygen amount from the second oxygen passage 40 of the burner 1 according to the oxygen-coal ratio 0.50Nm3/kg corresponding to the gasification of the pulverized coal while reducing the powder feeding amount; finally, the oxygen amount corresponding to the residual powder feeding amount is completely subtracted.
Step two: stopping pulverized coal in the pulverized coal channel after 1-3S, and introducing carbon dioxide gas into the pulverized coal channel after 1S;
step three: the corresponding oxygen amount is subtracted from the second oxygen passage 40 and added to the first oxygen passage 10 according to the fact that the oxygen amount of the first oxygen passage 10 accounts for 18% of the oxygen amount corresponding to the coal water slurry. Wherein, the oxygen quantity of the first oxygen channel 10 is increased and the oxygen quantity of the second oxygen channel 40 is reduced to 27083 multiplied by 0.20-4500 which is 917Nm 3/h.
Step four: the input amount of the coal water slurry is increased to 1500t/d, and simultaneously the oxygen amount of the first oxygen passage 10 and the oxygen amount of the second oxygen passage 40 are adjusted according to the oxygen-coal ratio 0.65Nm3/kg corresponding to the gasification of the coal water slurry and the oxygen amount of the first oxygen passage 10 accounting for 18 percent of the oxygen amount corresponding to the coal water slurry (the oxygen amount of the first oxygen passage 10 is 7313Nm3/h, and the oxygen amount of the second oxygen passage 40 is 33312Nm 3/h).
In the operation process of the gasification furnace, when the pulverized coal system is in trouble and needs to be overhauled, the pulverized coal can exit the gasification furnace on line by adopting the control method of the embodiment, and the stability of parameters such as pressure, temperature and the like in the gasification furnace is maintained by adjusting the oxygen amount of the first oxygen channel, the oxygen amount of the second oxygen channel and the like, so that the stable operation of the gasification furnace is realized, and the long-period stable operation of the production system is realized.
EXAMPLE IV on-line feeding of pulverized coal
The embodiment provides a control method of a gasification furnace, which comprises the following steps: step one, in the operation process of the gasification furnace, when the pulverized coal is conveyed through a pulverized coal channel according to the conveying quantity G0 ' and inert gas and/or carbon dioxide gas are conveyed through the pulverized coal channel, if the pulverized coal is required to be conveyed to the pulverized coal channel, the conveying quantity of a first oxygen channel 10 is adjusted from E0 ' to E1 ', the conveying quantity of a second oxygen channel 40 is adjusted from H0 ' to H1 ', E1 ' is the conveying quantity of the first oxygen channel 10 when materials are conveyed through any material channel and the other material channel in the gasification system, the sum of E1 ' and H1 ' is equal to the sum of E0 ' and H0 ', then the conveying of the inert gas and/or the carbon dioxide gas into the pulverized coal channel is stopped, and then the conveying of the pulverized coal to a channel according to the conveying quantity F0 ' is started within a preset time. Wherein, E0 'can be equal to A1' in the third embodiment, E1 'can be equal to A0' in the third embodiment. H0 "may be equal to D2" in example three. The preset time may be 3 s.
When the pulverized coal is conveyed to the pulverized coal passage according to the conveying capacity F0', the conveying capacity of the second pulverized coal passage 40 can be adjusted to be H2 ", and the ratio of H2" to F0 "is equal to the oxygen-coal ratio corresponding to the gasification of the pulverized coal in the gasification system.
Optionally, before the conveying amount of the first oxygen channel 10 is adjusted from E0 'to E1' and the conveying amount of the second oxygen channel 40 is adjusted from H0 'to H1', G0 'is the conveying amount of the other material channel when the material is conveyed by any one material channel and the other material channel in the gasification system, and the ratio of the sum of E0' and H0 'to G0' is equal to the oxygen-coal ratio corresponding to the gasification of the other material in the gasification system. Optionally, the ratio of E0 "to E0" in H0 "is 18% -25%.
Under the following conditions:
the coal feeding amount of the gasification furnace is 1500t/d, wherein the coal water slurry feeding amount is 500t/d, and the pulverized coal feeding amount is 1000 t/d. The total oxygen amount was 37500Nm3/h, wherein the oxygen amount of the first oxygen passage 10 was 4500Nm3/h (12% by weight). The ratio of pulverized coal to gasified oxygen to coal was 0.6Nm 3/kg.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the gasification of the coal-water slurry) of the coal-water slurry system is 0.65Nm3/kg, and the oxygen amount corresponding to the gasification of the coal-water slurry is 27083Nm 3/h.
The oxygen-coal ratio (namely the oxygen-coal ratio corresponding to the coal gasification of the pulverized coal) of the pulverized coal system in independent operation is 0.50Nm3/kg, and the oxygen amount corresponding to the coal gasification of the pulverized coal is 10417Nm 3/h.
The control method may include the steps of:
step one, reducing the input amount of the coal water slurry to 1000t/d, and simultaneously adjusting the oxygen amount of the first oxygen passage 10 and the oxygen amount of the second oxygen passage 40 (the oxygen amount of the first oxygen passage 10 is 4875Nm3/h, and the oxygen amount of the second oxygen passage 40 is 22208Nm3/h) according to the oxygen-coal ratio corresponding to the gasification of the coal water slurry of 0.65Nm3/kg and the oxygen amount of the first oxygen passage 10 accounts for 18% of the oxygen amount corresponding to the coal water slurry.
In the second step, the oxygen amount in the first oxygen passage 10 is reduced from 4875Nm3/h to 4500Nm3/h, and the oxygen amount in the second oxygen passage 40 is increased by 375Nm3/h, so that the total oxygen amount is kept unchanged.
And step three, stopping injecting the carbon dioxide gas in the pulverized coal channel.
And step four, after 3S, feeding the pulverized coal system, and meanwhile, increasing the oxygen amount 10417Nm3/h of the second oxygen channel 40 according to the oxygen-coal ratio 0.50Nm3/kg corresponding to pulverized coal gasification.
By the control method, in the operation process of the gasification furnace, when the coal water slurry system and the pulverized coal system have problems and need to be overhauled, the coal water slurry or the pulverized coal can exit the gasification furnace on line, and the parameters such as pressure and temperature in the gasification furnace are maintained to be stable in a mode of adjusting the oxygen amount, so that the gasification furnace is stably operated, and the production system is stably operated for a long period.
In the operation process of the gasification furnace with the withdrawn pulverized coal, when the problems of the pulverized coal system are solved and can be put into use, the pulverized coal can be put into the gasification furnace on line by adopting the control method of the embodiment, and the parameters such as pressure, temperature and the like in the gasification furnace are maintained to be stable by adjusting the oxygen amount of the first oxygen channel, the oxygen amount of the second oxygen channel and the like, so that the gasification furnace is stably operated, and the production system is stably operated for a long period.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A control method of a gasification furnace is provided, the gasification furnace is provided with a burner, the burner is provided with a first oxygen channel, a first material channel, a second material channel and a second oxygen channel which are sequentially sleeved from inside to outside, and the control method is characterized by comprising the following steps:
step one, in the operation process of the gasification furnace, if the material is required to be stopped being conveyed to any one of a first material channel and a second material channel, the conveying amount A0 of the first oxygen channel is kept unchanged, the conveying amount of the second oxygen channel is adjusted from D0 to D1, the D1 is equal to the amount obtained by subtracting the oxygen amount corresponding to the gasification of the material amount which is stopped being conveyed in the gasification system in advance from D0, and then the material is stopped being conveyed to any one material channel within a preset time.
2. The control method according to claim 1,
after stopping to any material passageway transported material, still include:
step two, supplying inert gas and/or carbon dioxide gas into the material channel stopping conveying the materials within preset time;
and step three, adjusting the conveying amount of the first oxygen channel to A1, and adjusting the conveying amount of the second oxygen channel to D2, wherein the sum of A1 and D2 is equal to the sum of A0 and D1.
3. The control method according to any one of claims 1 to 2,
the first material channel is a coal water slurry channel, and the second material channel is a pulverized coal channel.
4. The control method according to claim 2,
when any material in the first step is coal water slurry, the proportion of the A1 in the sum of the A1 and the D2 in the third step is 5-30%;
when any material in the step one is pulverized coal, the proportion of the A1 in the sum of the A1 and the D2 in the step three is 18-25%.
5. The control method according to claim 1,
in the first step, the stopping amount of the material to be conveyed in advance and the conveying amount of the second oxygen channel corresponding to the stopping amount are reduced according to two stages of 70-75% and 40-50%.
6. The control method according to claim 2,
after adjusting the delivery amount of the first oxygen passage to a1 and the delivery amount of the second oxygen passage to D2, the method further comprises:
step four, the conveying amount of a material channel for conveying materials all the time is adjusted from C0 to C1, the conveying amount of the first oxygen channel is adjusted to A2, the conveying amount of the second oxygen channel is adjusted to D3, the difference value between the C1 and the C0 is equal to the conveying amount of the materials when the materials are not conveyed in any material channel, and the ratio of the sum of the A2 and the D3 to the C1 is equal to the oxygen-coal ratio corresponding to the gasification of the materials conveyed all the time in the gasification system; furthermore, it is possible to provide a liquid crystal display device,
when any material in the first step is coal water slurry, the proportion of A2 in the sum of A2 and D3 is 5-30%;
when any material in the first step is pulverized coal, the proportion of A2 in the sum of A2 and D3 is 18-25%.
7. A control method of a gasification furnace is provided, the gasification furnace is provided with a burner, the burner is provided with a first oxygen channel, a first material channel, a second material channel and a second oxygen channel which are sequentially sleeved from inside to outside, and the control method is characterized by comprising the following steps:
step one, in the operation process of the gasification furnace, when a material is conveyed through any one material passage of the first material passage and the second material passage according to the conveying quantity G0 and an inert gas and/or a carbon dioxide gas are conveyed through the other material passage, if the material is required to be conveyed to the other material passage, the delivery amount of the first oxygen channel is adjusted from E0 to E1, the delivery amount of the second oxygen channel is adjusted from H0 to H1, the E1 is the conveying amount of the first oxygen channel when the material channel and the other material channel in the gasification system both convey the material, the sum of the E1 and the H1 is equal to the sum of the E0 and the H0, then the inert gas and/or the carbon dioxide gas are stopped from being conveyed into the other material channel, then, within a preset time, the material starts to be conveyed to the other material channel according to the conveying quantity F0.
8. The control method according to claim 7,
when the material is conveyed to the other material channel according to the conveying quantity F0, the conveying quantity of the second oxygen channel is adjusted to H2, and the ratio of the H2 to the F0 is equal to the oxygen-coal ratio corresponding to the gasification of the material which is conveyed in advance in the gasification system.
9. The control method according to any one of claims 7 to 8,
the first material channel is a coal water slurry channel, and the second material channel is a pulverized coal channel.
10. The control method according to claim 7,
before the conveying amount of the first oxygen channel is adjusted from E0 to E1, and the conveying amount of the second oxygen channel is adjusted from H0 to H1, so that G0 is the conveying amount of the other material channel when the material is conveyed by either material channel and the other material channel in the gasification system, and the ratio of the sum of E0 and H0 to G0 is equal to the oxygen-coal ratio corresponding to the gasification of the other material in the gasification system; furthermore, it is possible to provide a liquid crystal display device,
when the other material in the first step is coal water slurry, the proportion of the E0 to the E0 in the H0 is 5-30%;
when the other material in the step one is pulverized coal, the proportion of the E0 to the E0 in the H0 is 18-25%.
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