CN115125037A - Method for online adjustment of operating parameters of gasification furnace - Google Patents
Method for online adjustment of operating parameters of gasification furnace Download PDFInfo
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- 238000002309 gasification Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 280
- 239000007789 gas Substances 0.000 claims abstract description 99
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 50
- 239000001301 oxygen Substances 0.000 claims abstract description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 45
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 42
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- 239000010883 coal ash Substances 0.000 claims description 26
- 239000002893 slag Substances 0.000 claims description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 18
- 239000001569 carbon dioxide Substances 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 239000002956 ash Substances 0.000 claims description 13
- 238000004458 analytical method Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000004134 energy conservation Methods 0.000 claims description 7
- 238000000921 elemental analysis Methods 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 230000017525 heat dissipation Effects 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 description 19
- 230000015572 biosynthetic process Effects 0.000 description 12
- 238000003786 synthesis reaction Methods 0.000 description 12
- 230000001681 protective effect Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/06—Modeling or simulation of processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The embodiment of the disclosure provides a method for online adjustment of operating parameters of a gasification furnace, which comprises the following steps: determining a target coal amount and a target oxygen amount based on the coal quality data and the effective gas demand according to thermodynamic calculation; and adjusting the coal flow based on the operation data of the gasification furnace so that the actual coal feeding amount can be consistent with the target coal amount. By the method, when the types of the used coal are different, the coal flow can be adjusted in real time based on the operation data of the gasification furnace according to the coal quality data and the effective gas demand of the used coal, so that the carbon conversion rate is improved by accurately controlling and measuring the actual coal input amount, the temperature of the gasification furnace is stably controlled, and the gasification furnace is ensured to operate safely, stably and periodically.
Description
Technical Field
The disclosure relates to the technical field of coal gasification, in particular to a method for online adjustment of operating parameters of a gasification furnace.
Background
At present, in the technical field of high-temperature high-pressure coal gasification, in the operation process of a coal gasification device, the oxygen-coal ratio is an important parameter for controlling the combustion reaction in a gasification furnace and the temperature of the gasification furnace, the gasification furnace is damaged due to overhigh oxygen-coal ratio, and the gasification furnace is reduced due to overlow oxygen-coal ratio, so that the conversion rate of coal is influenced.
When the gasification furnace operates, coal drives pulverized coal particles to be conveyed through gas, the type of field coal is variable, the metering precision of the pulverized coal flowmeter is greatly influenced by the quality of the coal, the metering of the conventional gasification field pulverized coal flowmeter is not accurate enough, so that the oxygen-coal ratio is not accurately controlled, the flow field organization of the gasification furnace is influenced, and the safe operation of the gasification furnace is influenced.
Disclosure of Invention
In view of the above problems in the prior art, the present application provides a method for online adjustment of gasifier operating parameters, and the technical solution adopted in the embodiments of the present application is as follows:
a method for online adjustment of gasifier operating parameters comprises:
determining a target coal amount and a target oxygen amount based on the coal quality data and the effective gas demand according to thermodynamic calculation;
and adjusting the coal flow based on the operation data of the gasification furnace so as to keep the actual coal feeding amount consistent with the target coal amount.
In some embodiments, the coal quality data includes elemental analysis data and a coal ash melting point of the coal;
the determining the target coal quantity and the target oxygen quantity based on the coal quality data and the effective gas demand according to the thermodynamic calculation comprises the following steps:
obtaining input data, the input data comprising: the effective gas demand, the pressure value of the gasification furnace, the temperature of the gasification furnace, the oxygen temperature, the water-oxygen ratio, the water vapor temperature, the type of coal conveying gas, the flow rate of the coal conveying gas, the temperature of the coal conveying gas, the coal temperature, the coal element analysis data, the coal heat value, the type of shielding gas, the shielding gas amount, the temperature of the shielding gas, the melting point of the coal ash, the components of the coal ash and the heat dissipation capacity of the hearth;
and calculating the target coal amount and the target oxygen amount according to element conservation, energy conservation and Gibbs free energy minimum.
In some embodiments, the elemental analysis data of the coal comprises: carbon, hydrogen, oxygen, nitrogen, sulfur, moisture and ash account for the mass percent of the coal.
In some embodiments, the coal ash melting point comprises a flow temperature of the coal ash.
In some embodiments, the manner of obtaining the temperature of the gasification furnace includes: adding 50-150 ℃ on the basis of the flowing temperature of the coal ash.
In some embodiments, the coal conveying gas type comprises any one of carbon dioxide or nitrogen.
In some embodiments, the shielding gas type includes any one of carbon dioxide or nitrogen.
In some embodiments, the adjusting the coal flow based on the operational data of the gasifier includes:
acquiring operation data and actual oxygen input amount of a gasification furnace;
calculating the actual coal feeding amount according to the carbon element balance;
and adjusting the coal flow according to the comparison result of the actual coal feeding amount and the target coal amount.
In some embodiments, the operational data includes syngas flow, syngas composition, coarse slag carbon content, coarse slag content, fine slag carbon content, fine slag content, as-fired coal carbon content, coal conveying carbon dioxide gas content, and carbon dioxide shielding gas content.
In some embodiments, the enabling the actual coal input amount to be consistent with the target coal amount includes: the difference between the actual coal feeding amount and the target coal amount is not more than a preset value.
Compared with the prior art, the beneficial effects of the embodiment of the disclosure are that: according to the method for calculating the heat, the theoretically required target coal quantity and the target oxygen quantity of the gasification furnace during operation are determined according to the coal quality data and the effective gas demand of the used coal, and the coal flow is adjusted based on the operation data of the gasification furnace during actual operation, so that the actual coal feeding quantity can be kept consistent with the target coal quantity.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments generally by way of example and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 is a flowchart of a method for online adjustment of gasifier operating parameters according to an embodiment of the present disclosure.
Detailed Description
The following detailed description is provided to enable those skilled in the art to better understand the technical solutions of the present disclosure, with reference to the accompanying drawings and specific embodiments. Embodiments of the disclosure are described in further detail below with reference to the figures and the detailed description, but the disclosure is not limited thereto.
The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
The embodiment of the disclosure aims at the actual problem that the coal flow meter can not accurately measure in the field of gasification projects, and accurately adjusts the coal flow through the operation data of the gasifier during actual operation, so that the oxygen-coal ratio is controlled by controlling the actual coal feeding amount, the carbon conversion rate is improved, and the safe operation of the gasifier is ensured.
According to the method for calculating the coal quality, the target coal quantity and the target oxygen quantity theoretically required by the operation of the gasification furnace are determined according to the coal quality data and the effective gas demand of the used coal, the coal flow is adjusted based on the operation data of the gasification furnace in the actual operation, and finally the actual coal feeding quantity is consistent with the target coal quantity. And aiming at the target oxygen amount, the accurate regulation and control of the oxygen flow can be realized on the gasification site at present, so that the actual oxygen adding amount can be correspondingly regulated according to the actual coal adding amount so as to control the oxygen-coal ratio, and finally, when the actual coal adding amount is consistent with the target coal amount, the actual oxygen adding amount is also consistent with the target oxygen amount.
Fig. 1 is a flowchart of a method for online adjusting an operating parameter of a gasification furnace according to an embodiment of the present disclosure, and referring to fig. 1, the method for adjusting according to the embodiment of the present disclosure specifically includes the following steps:
and S1, determining a target coal amount and a target oxygen amount based on the coal quality data and the effective gas demand according to the thermodynamic calculation.
The target coal quantity and the target oxygen quantity in the step are numerical values of coal and oxygen obtained through theoretical calculation, the effective gas demand quantity is a numerical value of the effective gas quantity determined according to the demand of a user, and the coal quantity and the oxygen quantity which need to be input theoretically when the effective gas quantity is generated are calculated according to thermodynamic calculation based on the effective gas demand quantity and the coal quality data of the adopted coal, so that the target coal quantity and the target oxygen quantity are determined.
And S2, adjusting the coal flow based on the operation data of the gasification furnace so that the actual coal feeding amount can be consistent with the target coal amount.
Generally, coal is conveyed into a gasification furnace by coal conveying gas to drive pulverized coal particles, gas and solid in a coal conveying pipeline coexist, the measurement accuracy and precision of a pulverized coal flowmeter are greatly influenced by coal quality, and the measurement of the coal flowmeter on a gasification site is inaccurate.
According to the method for calculating the heat, the theoretically required target coal quantity and the target oxygen quantity of the gasification furnace during operation are determined according to the coal quality data and the effective gas demand of the used coal, and the coal flow is adjusted based on the operation data of the gasification furnace during actual operation, so that the actual coal feeding quantity can be kept consistent with the target coal quantity.
In some embodiments, the coal quality data includes elemental analysis data and a coal ash melting point of the coal;
the determining the target coal quantity and the target oxygen quantity based on the coal quality data and the effective gas demand according to the thermodynamic calculation comprises the following steps:
obtaining input data, the input data comprising: the effective gas demand, the pressure value of the gasification furnace, the temperature of the gasification furnace, the oxygen temperature, the water-oxygen ratio, the water vapor temperature, the type of coal conveying gas, the flow rate of the coal conveying gas, the temperature of the coal conveying gas, the coal temperature, the coal element analysis data, the coal heat value, the type of shielding gas, the shielding gas amount, the temperature of the shielding gas, the melting point of the coal ash, the components of the coal ash and the heat dissipation capacity of the hearth;
and calculating the target coal quantity and the target oxygen quantity according to element conservation, energy conservation and Gibbs free energy minimum.
In this embodiment, considering that the types of coal are varied, and the content of elements is different among different types of coal, and the content of substances generated after combustion reaction and combustion is also different, it is necessary to calculate the thermal power by using the coal quality data of the used types of coal. The coal quality data includes coal element analysis data, specifically, coal is analyzed to determine the content of each element in the coal, and in a specific embodiment, the coal element analysis data includes carbon, hydrogen, oxygen, nitrogen, sulfur, moisture, and ash in mass percent of the coal, so that the coal element analysis data of carbon (wt%), hydrogen (wt%), oxygen (wt%), nitrogen (wt%), sulfur (wt%), moisture (wt%), and ash (wt%) are obtained. The coal quality data also comprises a coal ash melting point, the coal can generate a large amount of coal ash after being combusted, the coal ash is in a molten state after exceeding the melting point, and the liquid coal ash has certain fluidity and is beneficial to discharging the coal ash from the gasification furnace. Therefore, in one embodiment, the ash fusion temperature is determined by measuring the ash flow temperature in the molten state, and the temperature in the gasifier is adjusted based on the ash fusion temperature to avoid slagging in the gasifier and adversely affect ash removal. In another specific embodiment, the manner of obtaining the temperature of the gasification furnace includes: based on the measured flowing temperature of the coal ash, the temperature of the gasification furnace is set to be 50-150 ℃, so that the coal ash can be favorable for keeping a flowing state with proper viscosity, the requirements of slag tapping and slag resistance of the gasification furnace are met, and the operating environment of the gasification furnace is maintained to ensure the safe operation of the gasification furnace.
In this embodiment, when acquiring input data, the input data first includes the effective gas demand (Nm) of the user 3 H), coal quality data of coal used in operation of the gasification furnace, including elemental analysis data (wt%) and a coal ash melting point (DEG C) of coal, and a coal calorific value (kJ/kg), and also including operating parameters of the gasification furnace itself in operation, including gasification furnace pressure (MPaA) and gasification furnace temperature (DEG C), and various parameters in conveying coal powder and oxygen, including a coal conveying gas type, a coal conveying gas flow rate (Nm) 3 H), coal gas temperature (deg.C), coal temperature (deg.C), type of shielding gas, and amount of shielding gas (Nm) 3 H), the temperature of the shielding gas (DEG C), the mass percentage (wt%) of each component in the coal ash after coal combustion, the input oxygen temperature (DEG C), the input water vapor controlled by the water-oxygen ratio (kg/kg), the water vapor temperature (DEG C), and the heat dissipation capacity (kW) of a hearth. The relevant parameter values are characterized herein by the symbols of the units of measure that are well known and customary in the coal gasification art.
In the embodiment, considering that the combustion products of coal are related to the combustion process of coal, no matter how the combustion process is carried out or what products are produced, according to the element conservation law, the mass of the same element before and after combustion is equal, and a group of mass conservation equations can be established; establishing a group of energy conservation equations aiming at the energy generated by coal combustion according to the law of energy conservation; and then establishing a group of equations with minimum Gibbs free energy satisfied by combustion reaction according to the concept of chemical equilibrium, so that the calculation is carried out according to element conservation, energy conservation and Gibbs free energy minimum energy in thermodynamic calculation, and the coal quantity and the oxygen quantity theoretically input based on the input data are calculated, thereby determining the target coal quantity and the target oxygen quantity.
In this embodiment, the effective gas demand is, for example, 50000Nm 3 The operating pressure of the gasifier is 4.1MPaA, the temperature of the gasifier is 1500 ℃, and the used analysis data of coal in coal is as follows: 70.15 wt% of carbon C, 2.36 wt% of hydrogen H, 3.16 wt% of oxygen O, 0.97 wt% of nitrogen N, 0.32 wt% of sulfur S, 3.19 wt% of H2O, 19.85 wt% of ash, 1400 ℃ of flow temperature of coal ash, 26080.74kJ/kg of coal calorific value, carbon dioxide as coal conveying gas, 2724Nm of coal conveying gas flow rate 3 The temperature of coal conveying gas is 80 ℃, the temperature of coal is 80 ℃, the protective gas is nitrogen, and the protective gas quantity is 1500Nm 3 The temperature of the protective gas is 200 ℃, the temperature of the oxygen is 180 ℃, the water-oxygen ratio is 0.1kg/kg, the temperature of the water vapor is 350 ℃, and the percentage of each component in the coal ash generated after the coal is combusted is SiO 2 :51.62wt％、Al 2 O 3 :29.49wt％、Fe 2 O 3 :4.06wt％、MgO:1.16wt％、CaO:4.68wt％、Na 2 O:1.22wt％、K 2 O:1.64wt％、TiO 2 :1.21wt％、SO 3 2.02 wt% and the heat dissipation capacity of the hearth is 2479.5 kW. According to the calculation of element conservation, energy conservation and Gibbs free energy minimum energy, the target coal quantity is determined to be 29.68t/h, and the target oxygen quantity is determined to be 16575Nm 3 /h。
In some embodiments, the coal conveying gas type generally employs any one of carbon dioxide or nitrogen to entrain and uniformly convey the coal fines into the gasifier.
In some embodiments, the shielding gas type is typically either carbon dioxide or nitrogen.
In some embodiments, the adjusting the coal flow based on the operation data of the gasification furnace includes the steps of:
and S21, acquiring the operation data and the actual oxygen adding amount of the gasification furnace.
In this embodiment, when the coal charging amount is different, the flow rates of the synthesis gas generated after the coal is combusted in the gasification furnace are different, and the contents of various gases in the synthesis gas are also different, that is, the flow rates and the component contents of the synthesis gas generated by the combustion reaction of the coal charging amounts with different values in the gasification furnace, the ash components and other product contents are different, so that the actual coal charging amount of the gasification furnace during the current operation can be calculated according to the measured actual data by measuring the actual data of each component on line during the operation of the gasification furnace. In this step, the operation data of the gasification furnace, including, for example, the flow rate of the output synthesis gas, the mole percentage of each gas in the synthesis gas, the amount of generated ash, the carbon content in the ash, the flow rate of the carbon dioxide gas in the coal conveying gas or the shielding gas, etc., is obtained, and the actual oxygen input amount is also obtained, and in the specific implementation, the actual oxygen input amount is obtained through measurement by a gas flow meter on the oxygen input pipeline. In a particular embodiment, the operational data includes a flow rate (Nm) of syngas generated by a coal combustion reaction 3 H), and composition of various gases in the syngas (mol%), carbon content in coarse slag generated after coal combustion (wt%), coarse slag content (t/h), carbon content in fine slag (wt%), fine slag content (t/h), carbon content in coal input into the gasifier (wt%) (which can be obtained based on the elemental analysis data of coal in the above examples), amount of carbon dioxide gas for coal transportation (Nm) 3 H) protective gas amount of carbon dioxide (Nm) 3 /h)
And S22, calculating the actual coal feeding amount according to the carbon element balance.
According to the element conservation law, the mass of the same element in the gasification furnace is equal before and after the coal is combusted, the mass conservation equation of the carbon element before and after the combustion reaction in the gasification furnace is listed through the carbon element balance, and the actual coal feeding amount is calculated.
And S23, adjusting the coal flow according to the comparison result of the actual coal feeding amount and the target coal amount.
Comparing the calculated actual coal feeding amount with the target coal feeding amount, and increasing the coal flow through a coal flow regulating valve to increase the actual coal feeding amount if the actual coal feeding amount is lower than the target coal feeding amount; if the actual coal feeding amount exceeds the target coal amount, the coal flow is adjusted to be small through the coal flow adjusting valve so as to reduce the actual coal feeding amount, and therefore the coal flow is adjusted on line in real time based on actual operation data of the gasification furnace, and the actual coal feeding amount is adjusted.
In the specific implementation, after the coal flow valve is adjusted for the first time to input the coal powder into the gasification furnace, in the operation process of the gasification furnace, the flow of the synthetic gas generated during the coal combustion is firstly measured to be 50426.58Nm 3 And h, measuring the components of each gas in the synthesis gas, wherein the components and the mole percentages of each gas in the synthesis gas are respectively as follows: methane CH 4 389.98ppm, 70.11 mol% of CO, and CO 2 4.37 mol% of hydrogen gas H 2 19.06 mol% of water vapor H 2 2.91 mol% of O and hydrogen sulfide H 2 S0.11 mol%, nitrogen N 2 3.4 mol%, total ash output of 6.554t/h, carbon content of coarse slag of 8 wt%, coarse slag of 4.5878t/h, carbon content of fine slag of 31.28 wt%, fine slag of 1.9662t/h, carbon content of coal as fired of 70.15 wt% according to coal element analysis data, and coal conveying carbon dioxide gas amount of 2761Nm 3 The protective gas is nitrogen.
Measuring the actual oxygen amount 15297Nm input in the operation process of the gasification furnace 3 And h, listing a mass conservation equation of the carbon elements before and after the combustion reaction in the gasification furnace according to the carbon element balance, and calculating the actual coal feeding amount to be 28 t/h. As the target coal amount is 29.68t/h, the comparison shows that the actual coal feeding amount is 5.66 percent less than the target coal amount. Under the condition of the actual coal input, the generated effective gas amount is 44964.06Nm 3 The carbon conversion was 95%.
And because the actual coal feeding amount is calculated to be lower than the target coal amount, the coal flow is increased through the coal flow regulating valve for the second time so as to increase the actual coal feeding amount.
In some embodiments, the enabling the actual coal input amount to be consistent with the target coal amount includes: the difference between the actual coal feeding amount and the target coal amount does not exceed a preset value. In this embodiment, since the adjustment of the coal flow rate adjustment valve cannot be too accurate, a value can be preset, and the difference value for adjusting the actual coal injection amount to be lower than or exceed the target coal amount does not exceed the preset range, that is, the actual coal injection amount is considered to be consistent with the target coal amount.
For example, the preset value may be set to 1%, after the coal flow valve is adjusted for the first time, the actual coal injection amount at that time is calculated to be 5.66% less than the target coal amount and to exceed the preset value by 1%, and the actual coal injection amount is considered to be inconsistent with the target coal amount, and the coal flow rate is continuously increased to increase the actual coal injection amount.
And after the actual coal feeding amount is increased by adjusting the coal flow valve for the second time, the operation data of the gasification furnace is obtained again, and the actual coal feeding amount after the coal flow is adjusted for the second time is calculated. The flow rate of the synthetic gas generated after the coal combustion is 53219.03Nm 3 And h, measuring the components of each gas in the synthesis gas, wherein the components and the mole percentages of each gas in the synthesis gas are respectively as follows: methane CH 4 517.72ppm, 71.43 mol% of CO, and CO 2 2 3.55 mol% of hydrogen gas H 2 19.28 mol% of water vapor H 2 2.35 mol% of O and hydrogen sulfide H 2 0.1 mol% of S and nitrogen N 2 3.24 mol%, the carbon content of the coarse slag is 6 wt%, the carbon content of the coarse slag is 4.9416t/h, the carbon content of the fine slag is 8.93 wt%, the carbon content of the fine slag is 1.2354t/h, the carbon content of the coal as fired can be 70.15 wt% according to the element analysis data of the coal, and the gas content of the carbon dioxide for coal transportation is 2733Nm 3 And/h, the protective gas is nitrogen.
Measuring the actual oxygen amount 16114Nm input during the operation of the gasifier 3 And h, listing a mass conservation equation of the carbon elements before and after the combustion reaction in the gasification furnace according to the carbon element balance, and calculating the actual coal feeding amount to be 29 t/h. As the target coal amount is 29.68t/h, the comparison shows that the actual coal feeding amount is 2.29 percent less than the target coal amount. Under the condition of the actual coal feeding amount, the produced coalEffective air volume 48276.4Nm 3 H, carbon conversion 98%.
Therefore, after the coal flow is adjusted for the second time, the actual coal feeding amount is 2.29 percent less than the target coal amount and still exceeds the preset value by 1 percent, namely, the actual coal feeding amount is not consistent with the target coal amount, and the coal flow needs to be continuously increased to increase the actual coal feeding amount.
And adjusting the coal flow valve for the third time, increasing the coal flow, and obtaining the operation data of the gasification furnace again after the third adjustment is completed so as to calculate the actual coal feeding amount after the third adjustment of the coal flow. The flow rate of the synthesis gas generated after the coal is combusted is 54635.34Nm 3 And/h, measuring the components of each gas in the synthesis gas, wherein the components and the mole percentages of each gas in the synthesis gas obtained by measurement are respectively as follows: methane CH 4 579.7ppm, 71.91 mol% of CO, and carbon dioxide CO 2 3.25 mol% of hydrogen gas H 2 19.36 mol% of water vapor H 2 2.15 mol% of O, hydrogen sulfide H 2 0.1 mol% of S and nitrogen N 2 3.17 mol%, the carbon content of the coarse slag is 3.2 wt%, the coarse slag content is 5.4873t/h, the carbon content of the fine slag is 4.8 wt%, the fine slag content is 0.6097t/h, the carbon content of the coal as fired can be 70.15 wt% according to the coal element analysis data, and the gas content of the carbon dioxide for coal transportation is 2741Nm 3 And/h, the protective gas is nitrogen.
The actual oxygen amount input in the operation process of the gasification furnace is measured at the moment, namely 16532Nm 3 And h, listing a mass conservation equation of the carbon elements before and after the combustion reaction in the gasification furnace according to the carbon element balance, and calculating the actual coal feeding amount to be 29.6 t/h. As the target coal amount is 29.68t/h, the comparison shows that the actual coal feeding amount is less than the target coal amount by 0.27%, at the moment, the difference value between the actual coal feeding amount and the target coal amount is in the range of 1% of the preset value, the actual coal feeding amount is considered to be consistent with the target coal amount, and the coal feeding amount at the moment is kept unchanged. Under the condition of the final actual coal feeding amount, the effective gas amount is 49866.9Nm 3 H, carbon conversion 99%.
Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the disclosure having equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the specification or during the prosecution of the disclosure, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a non-claimed disclosed feature is essential to any claim. Rather, the subject matter of the present disclosure may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
The above embodiments are only exemplary embodiments of the present disclosure, and are not intended to limit the present disclosure, the scope of which is defined by the claims. Various modifications and equivalents of the disclosure may occur to those skilled in the art within the spirit and scope of the disclosure, and such modifications and equivalents are considered to be within the scope of the disclosure.
Claims (10)
1. A method for online adjustment of gasifier operating parameters, comprising:
determining a target coal amount and a target oxygen amount based on the coal quality data and the effective gas demand according to thermodynamic calculation;
and adjusting the coal flow based on the operation data of the gasification furnace so as to keep the actual coal feeding amount consistent with the target coal amount.
2. The method of claim 1, wherein,
the coal quality data comprises the element analysis data of coal and the melting point of coal ash;
the determining of the target coal quantity and the target oxygen quantity based on the coal quality data and the effective gas demand according to the thermodynamic calculation comprises the following steps:
obtaining input data, the input data comprising: the effective gas demand, the pressure value of the gasification furnace, the temperature of the gasification furnace, the oxygen temperature, the water-oxygen ratio, the water vapor temperature, the type of coal conveying gas, the flow rate of the coal conveying gas, the temperature of the coal conveying gas, the coal temperature, the coal element analysis data, the coal heat value, the type of shielding gas, the shielding gas amount, the temperature of the shielding gas, the melting point of the coal ash, the components of the coal ash and the heat dissipation capacity of the hearth;
and calculating the target coal quantity and the target oxygen quantity according to element conservation, energy conservation and Gibbs free energy minimum.
3. The method of claim 2, wherein the elemental analysis data of the coal comprises: carbon, hydrogen, oxygen, nitrogen, sulfur, moisture and ash account for the mass percent of the coal.
4. The method of claim 2, wherein the coal ash melting point comprises a flow temperature of coal ash.
5. The method of claim 4, wherein the means for obtaining the temperature of the gasifier comprises: adding 50-150 ℃ on the basis of the flowing temperature of the coal ash.
6. The method of claim 2, wherein the coal conveying gas type comprises any of carbon dioxide or nitrogen.
7. The method of claim 2, wherein the shielding gas type comprises any one of carbon dioxide or nitrogen.
8. The method of claim 1, wherein the adjusting the coal flow based on operational data of the gasifier comprises:
acquiring operation data and actual oxygen input amount of a gasification furnace;
calculating the actual coal feeding amount according to the carbon element balance;
and adjusting the coal flow according to the comparison result of the actual coal feeding amount and the target coal amount.
9. The method of claim 8, wherein the operational data includes syngas flow, syngas composition, coarse slag carbon content, coarse slag content, fine slag carbon content, fine slag content, as-fired coal carbon content, coal conveying carbon dioxide gas amount, carbon dioxide shield gas amount.
10. The method of claim 1, wherein said enabling the actual coal charge to be consistent with the target coal charge comprises: the difference between the actual coal feeding amount and the target coal amount is not more than a preset value.
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