Online calculation and control method for gasification performance of entrained-flow bed gasifier

Abstract

The invention provides an online calculation and control method for gasification performance of an entrained-flow bed gasification furnace, which comprises the following steps of: on the basis of coal quality online element analysis data and coal quality online ash content analysis data, carrying out online correction on the flow of pulverized coal entering the furnace; and calculating the real-time carbon conversion rate and the real-time cold coal gas efficiency by combining the furnace oxygen flow data, the furnace carbon dioxide flow data and the synthesis gas flow and component data. By establishing a time sequence database corresponding to the data, a production operation optimal value (such as an optimal oxygen-coal ratio) within a certain coal quality fluctuation range can be found out from the time sequence database to serve as a control target. The problem of online real-time evaluation and optimization of the gasification performance is solved, control of the optimal value (such as the optimal oxygen-coal ratio) of production operation under the coal quality fluctuation working condition can be achieved, and automatic and efficient operation and intelligent control of the gasification furnace are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automatic control and intelligent control of entrained flow gasification, in particular to an online calculation and control method for gasification performance of an entrained flow gasification furnace. BACKGROUND

[0002] In the field of entrained flow gasification, it is difficult to obtain online measurement of coal quality, and the coal quality is prone to fluctuation. When the pulverized coal flow and coal quality fluctuate, it is difficult to correct the fluctuation, resulting in that the coal quality and flow entering the gasification furnace cannot be obtained in time and accurately.

[0003] In the process of entrained flow gasification, carbon conversion rate and cold coal gas efficiency are key indicators for measuring the gasification performance of the gasification furnace.

[0004] Carbon conversion rate refers to the proportion of carbon in the raw material converted into gaseous products, and the calculation formula is: carbon conversion rate (%) = (1 - carbon content in residue / carbon content in raw coal) * 100%. At present, in the coal chemical industry, the carbon contents in raw coal and residue (crude slag and fine ash at the outlet of the gasification furnace) are obtained by offline analysis through sampling, and then indirectly calculated.

[0005] Cold coal gas efficiency refers to the ratio of chemical energy of generated synthesis gas to chemical energy of raw material, and the calculation formula is: cold coal gas efficiency (%) = (high calorific value of synthesis gas / high calorific value of raw coal) * 100%. At present, in the coal chemical industry, the high calorific value of raw material is also obtained by offline analysis through sampling of raw coal, and then indirectly calculated.

[0006] Since the uniformity of residue (crude slag and fine ash at the outlet of the gasification furnace) is poor, the representativeness of residue sampling is poor. The offline analysis of raw coal and residue takes a long time, generally several hours. Therefore, the precision of the traditional carbon conversion rate and cold coal gas efficiency evaluation method is low, the lag time is long, and the real-time analysis data is poor. Realizing online real-time calculation of carbon conversion rate and cold coal gas efficiency has important practical significance for realizing automatic control of the high-efficiency control target (referring to the high carbon conversion rate and cold coal gas efficiency target) of the gasification furnace.

[0007] At present, the calculation of carbon conversion rate and cold coal gas efficiency of the gasification furnace is obtained indirectly by sampling and analyzing residual carbon of the ash and slag discharged from the gasification furnace. Since the sampling of the ash and slag of the gasification furnace has poor representativeness and the analysis period is long, the evaluation of the carbon conversion rate and cold coal gas efficiency of the gasification furnace has long lag time and poor precision. The conventional method and the existing deficiencies are as follows:

[0008] (1) By sampling and analyzing residual carbon of the ash and slag discharged from the gasification furnace, since the sampling of the ash and slag of the gasification furnace has poor representativeness and the analysis period is long, online real-time evaluation of the carbon conversion rate and cold coal gas efficiency of the gasification furnace cannot be achieved, and the lag time is long and the precision is poor.

[0009] (2) CN 106773718 B "An Oxygen-to-Carbon Ratio Control System and Its Oxygen-to-Coal Ratio Control Method for Gasifier", CN206470544 U "An Oxygen-to-Carbon Ratio Control System", these two patents relate to a predictive control-based oxygen-to-coal ratio control method for gasifiers. The oxygen-to-carbon ratio control system includes a cascade loop with syngas composition as the controlled variable. This cascade loop includes a main loop and a secondary loop. The main loop includes a main loop controller, and the secondary loop is a pulverized coal flow rate regulation loop. This control method assumes that the coal quality and coal flow rate are stable. In actual production, the coal quality and coal quantity are variable. CN202410548364 "A Density-Based Coal Quality Parameter Analysis Method and Analyzer Based on Big Data", this method is based on ρ 煤 =ρ AA +ρ MM +ρ VV +ρ FCFC Based on a large amount of collected coal quality parameters A, M, V, FC, Q, and S data, a coal quality parameter database and identification and analysis software package were established. This software package analyzes the coal quality parameters A, M, V, FC, Q, and S based on the coal quality parameter change signal U measured by the coal quality parameter measuring device. However, this method cannot provide elemental analysis data for C, H, N, O, S, and ash content in the coal, and cannot be used for real-time online calculation and evaluation of gasifier carbon conversion rate and cold gas efficiency. CN202110319366, "A Method for Online Adjustment of Gasifier Operating Parameters," describes a method that determines the target coal quantity and target oxygen quantity based on thermal calculations, coal quality data, and effective gas demand. However, coal quality data fluctuates, and coal flow rate data fluctuates with the fluctuations in coal quality and operating parameters. This invention cannot be applied to such fluctuations and cannot be used for online adjustment of gasifier operating parameters in systems with fluctuating coal quality. Summary of the Invention

[0010] This invention provides an online calculation and control method for the gasification performance of a fluidized bed gasifier, solving the problem of achieving optimal production operation values ​​based on coal quality fluctuation ranges. The technical solution is as follows:

[0011] An online calculation and control method for the gasification performance of a fluidized bed gasifier includes the following steps:

[0012] S1: Collect online elemental analysis time-series data of coal quality and establish a database (D1);

[0013] S2: Collect time-series data of pulverized coal flow rate into the furnace, establish a database (D3), use the online pulverized coal density correction module (D2) to call the corresponding data from the online elemental analysis time-series database of coal quality (D1) to correct the coal quality density, and then correct and calculate the pulverized coal flow rate into the furnace to obtain the time-series data of pulverized coal flow rate into the furnace, and establish a database (D3).

[0014] S3: using the pulverized coal flow data of the pulverized coal flow time series database (D3), combining the carbon dioxide flow data of the carbon dioxide flow database (D5), the syngas flow data of the syngas flow time series database (D6), and the percentage content data of CO and CO2 in the syngas component time series database (D7), transmitting to the carbon conversion rate calculation module (D8) for carbon conversion rate calculation;

[0015] S4: using the pulverized coal flow data of the pulverized coal flow time series database (D3), combining the syngas flow data of the syngas flow time series database (D6) and the content of CO, H2 and CH4 in the syngas component time series database (D7), transmitting to the cold coal gas efficiency calculation module (D9) for cold coal gas efficiency calculation;

[0016] S5: using the carbon conversion rate and the cold coal gas efficiency, forming the gasifier operation performance database (D10);

[0017] S6: calculating the time corresponding relationship of the gasifier oxygen input, the pulverized coal flow time series, the syngas flow time series, the coal quality online ash content analysis time series, and the syngas component time series through the gasifier operation performance calculation module (D11);

[0018] S7: calling the data of the gasifier operation performance database (D10) through the gasifier operation performance calculation module (D11) to obtain the production optimization value (i.e. the optimal oxygen-coal ratio) of the coal quality of the gasifier within a certain fluctuation range, and communicating with the gasification DCS for automatic control of the optimal oxygen-coal ratio of the gasifier to realize efficient operation of the gasification.

[0019] Further, in step S1, the data source of the coal quality online ash content analysis time series data (D1) is a coal quality online analyzer, which samples from the pulverized coal atmospheric pressure storage bin 1 to obtain the contents of carbon, hydrogen, oxygen, nitrogen, sulfur, SiO2, CaO, Al2O3, MgO, Fe2O3, K2O, Na2O, MnO2, and TiO2.

[0020] Further, in step S2, the pulverized coal density online correction module (D2) uses the following correction formula for the pulverized coal density:

[0021]

[0022] The ρ1 is the corrected density of the pulverized coal (Kg / m 3) ; a0 - the sum of the calibrated mass percentages of organic substances (C, H, O, N, S, etc.) in the pulverized coal; a1 - the sum of the online measured mass percentages of organic substances (C, H, O, N, S, etc.) in the pulverized coal; b0 - the sum of the calibrated mass percentages of ash in the pulverized coal; b1 - the sum of the online measured mass percentages of ash in the pulverized coal; p0 - the calibrated density of the pulverized coal (Kg / m 3 ).

[0023] Further, in step S2, the pulverized coal density online correction module (D2) uses the following correction formula of the pulverized coal flow:

[0024] F1 = A x p1 x v1 ②

[0025] Wherein, A - the cross-sectional area of the pipeline flow (m 2 ) ; F1 - the online measured flow of the pulverized coal (Kg / s) ; p1 - the corrected density of the pulverized coal (Kg / m 3 ) ; v1 - the online measured flow rate of the pulverized coal (m / s).

[0026] Further, in step S3, the carbon conversion rate calculation module (D8) uses the following formula to calculate the carbon conversion rate η1:

[0027]

[0028] Wherein, F s - the flow of the synthesis gas (Nm 3 / s) ; γ1 - the sum of the volume percentages of CO and CO2 in the dry basis synthesis gas at the outlet of the gasifier; F1 - the online measured flow of the pulverized coal (Kg / s) ; F2 - the flow of the carbon dioxide protective gas into the gasifier (Nm 3 / s) ; a 1,C - the online measured mass percentage of C in the pulverized coal.

[0029] Further, in step S4, the cold coal gas efficiency calculation module (D9) uses the following formula to calculate the cold coal gas efficiency η2:

[0030]

[0031] Q gr,syn = 12.64 γ 1,CO + 12.75 x H2% + 39.8 x CH4% ⑤

[0032] Q gr,daf = 340 C daf + 1241.9 H daf + 62.7 N daf + 190.7 S daf - 98.3 O daf ⑥

[0033] F = F1 + F2 s —synthesis gas flow (Nm 3 / s); F1—pulverized coal online measurement flow (Kg / s); Q gr,syn —high heating value of synthesis gas (MJ / Nm 3 ); Q gr,daf —high heating value of dry ash-free basis coal (kJ / kg); γ 1,CO —volume percentage of CO in dry basis synthesis gas at the outlet of the gasifier; C daf —mass fraction of C in dry ash-free basis; H daf —mass fraction of H in dry ash-free basis; N daf —mass fraction of N in dry ash-free basis; O daf —mass fraction of O in dry ash-free basis; S daf —mass fraction of S in dry ash-free basis.

[0034] Further, in step S6, according to the gasifier operation performance calculation module, the current system clock time is set as time stamp T1, i.e. the corresponding time of the carbon conversion rate and cold gas efficiency calculation results, corresponding to the gasifier coal flow, oxygen content, carbon dioxide database time sequence; define the coal quality online ash analysis time sequence T0: corresponding to the pulverized coal storage location; define the gasifier synthesis gas flow and component time sequence T2: corresponding to the scrubber outlet position; see Figure 2 .

[0035] Further, define the time length t2 of the pulverized coal detected by the coal quality online detection being transported to the gasifier; define the time length t3 of the synthesis gas being transported from the gasifier to the scrubber outlet; define the calculation period t: as <t2-t0>; see Figure 2 .

[0036] The online calculation and control method of the gas flow bed gasification furnace gasification performance takes the online measurement of the main input parameters (coal quality, flow) and the main output parameters (synthesis gas composition, synthesis gas flow) of the gasification furnace as the breakthrough point, calculates the carbon conversion rate and the cold coal gas efficiency of the gasification furnace in real time through the establishment of the time sequence database of the main parameters of the upstream and downstream of the gasification furnace, finds out the optimal value (for example, the optimal oxygen coal ratio) of the production operation within a certain coal quality fluctuation range, and finally can perform automatic control of the gasification furnace, which is an effective method for improving the energy efficiency and intelligent control of the gasification furnace.

[0037] The present application is supported by the online analysis results of coal quality, the pulverized coal flow is corrected online with the fluctuation of coal quality, the carbon conversion rate and the cold coal gas efficiency of the gasification furnace are calculated in real time, and then the optimal value (for example, the optimal oxygen coal ratio) of the production operation within a certain coal quality fluctuation range can be found for production control, which is an effective method for improving the energy efficiency and intelligent control of the gasification furnace. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a structural schematic diagram of the gas flow bed gasification furnace;

[0039] Figure 2 is a corresponding relationship diagram of the process position, time and time sequence.

[0040] Figure 3 is a work flow diagram of the online calculation and control method of the gas flow bed gasification furnace gasification performance. DETAILED DESCRIPTION

[0041] As Figure 1 shown, the gasification furnace production system comprises a pulverized coal atmospheric storage bin 1, a pulverized coal lock hopper 2, a pulverized coal feeding tank 3 and a gasification furnace 4 connected in sequence, the pulverized coal atmospheric storage bin 1 is connected with a coal quality online analyzer 6, the pulverized coal feeding tank 3 is connected with a plurality of gasification furnaces 4, and a pulverized coal flow meter 9 is arranged between the pulverized coal feeding tank 3 and the gasification furnace 4.

[0042] The top of the gasification furnace 4 is used for inputting pulverized coal, oxygen and carbon dioxide; the middle part is connected with a synthesis gas separation washing tower 5, the synthesis gas separation washing tower 5 is connected with a synthesis gas component analyzer 7, the gasification furnace 4 and the synthesis gas separation washing tower 5 are both connected with an ash and slag water treatment system 11, the ash and slag water treatment system 11 is provided with a fine ash sampling point; the bottom of the gasification furnace 4 is connected with a slag conveyer 10 through a slag lock hopper 8, and the slag conveyer 10 is provided with a coarse slag sampling point.

[0043] When running, the pulverized coal in the pulverized coal atmospheric storage bin 1 is analyzed by the coal quality online analyzer 6, and then enters the gasification furnace 4 through the pulverized coal lock hopper 2 and the pulverized coal feeding tank 3. After the reaction in the gasification furnace 4, the synthesis gas enters the synthesis gas separation and washing tower 5, the ash water enters the ash water treatment system 11, and the ash enters the slag conveyer 10 through the slag lock hopper 8.

[0044] The time required for a period from the pulverized coal entering the pulverized coal atmospheric storage bin 1 to the synthesis gas being discharged from the washing tower is t. The input of the gasification furnace 4 includes the pulverized coal, oxygen, steam and carbon dioxide protective gas, and the output is the synthesis gas. The material conveying speed from the pulverized coal atmospheric storage bin 1 to the gasification furnace 4 is accurately calculated, and the reaction speed of the gasification furnace 4 is stable. Therefore, according to the mass conservation law and the mechanism model of the gas phase reaction of the gasification furnace, the time sequence corresponding relationship of the input and output can be obtained.

[0045] The time stamp T1 is set according to the current system clock time of the gasification furnace operation performance calculation module, that is, the corresponding time of the carbon conversion rate and the cold coal gas efficiency calculation result, and the time sequence corresponding of the gasification furnace coal flow, oxygen and carbon dioxide database; the coal quality online ash analysis time sequence T0 is defined: corresponding to the coal powder storage bin position; the gasification furnace synthesis gas flow and component time sequence T2 is defined: corresponding to the washing tower outlet position; see Figure 2 .

[0046] The time t2 of the pulverized coal transferred to the gasification furnace detected by the coal quality online detection is defined; the time t3 of the synthesis gas conveyed from the gasification furnace to the washing tower outlet is defined; the calculation period t is defined as <t2-t0>; see Figure 2 .

[0047] As Figure 3 indicated, the online calculation and control method of the gasification performance of the entrained-flow gasification furnace provided by the application is a method of the gasification performance of the gasification furnace based on time series data, and the steps are as follows:

[0048] S1: collecting coal quality online element analysis time series database (D1), wherein the data source of the coal quality online ash component analysis time series data (D1) is a coal quality online analyzer 6, the coal quality online analyzer 6 samples from a pulverized coal normal pressure storage bin 1 to obtain carbon, hydrogen, oxygen, nitrogen, sulfur, SiO2, CaO, Al2O3, MgO, Fe2O3, K2O, Na2O, MnO2, and TiO2 contents;

[0049] S2: establishing a time series database (D3) of the pulverized coal flow into the furnace, using a pulverized coal density online correction module (D2) to call the data of the coal quality online element analysis time series database (D1), correct the coal quality density, and then correct and calculate the pulverized coal flow into the furnace to obtain the time series database (D3) of the pulverized coal flow into the furnace; the pulverized coal density online correction module (D2) is not required to be set up for the coal water slurry gasification process.

[0050] The correction formula of the pulverized coal density used by the pulverized coal density online correction module (D2) is as follows:

[0051]

[0052] ρ1—the corrected density of the pulverized coal (Kg / m 3 ); α0—the sum of the calibrated mass percentages of the organic substances (C, H, O, N, S, etc.) in the pulverized coal; α1—the sum of the online measured mass percentages of the organic substances (C, H, O, N, S, etc.) in the pulverized coal; β0—the sum of the calibrated mass percentages of the ash in the pulverized coal; β1—the sum of the online measured mass percentages of the ash in the pulverized coal; ρ0—the calibrated density of the pulverized coal (Kg / m 3 ).

[0053] The correction formula of the pulverized coal flow used by the pulverized coal density online correction module (D2) is as follows:

[0054] F1=A×ρ1×v1 ②

[0055] Wherein, A—the flow cross-sectional area of the pipeline (m 2 ); F1—the online measured flow of the pulverized coal (Kg / s); ρ1—the corrected density of the pulverized coal (Kg / m 3 ); v1—the online measured flow rate of the pulverized coal (m / s).

[0056] S3: using the pulverized coal flow data of the pulverized coal flow time series database (D3), combining the carbon dioxide flow data of the carbon dioxide flow database (D5), the syngas flow data of the syngas flow time series database (D6), and the percentage content data of CO and CO2 in the syngas component time series database (D7), transmitting to the carbon conversion rate calculation module (D8) to calculate the carbon conversion rate;

[0057] The gasifier DCS control system can provide an oxygen flow time series database (D4), a carbon dioxide flow database (D5), a syngas flow time series database (6), and a syngas component time series database (7).

[0058] The carbon conversion rate η1 used by the carbon conversion rate calculation module (D8) is calculated according to the following formula:

[0059]

[0060] Wherein, F s — syngas flow (Nm 3 / s); γ1— the sum of the volume percentages of CO and CO2 in the dry basis syngas at the outlet of the gasifier; F1— online measured flow of pulverized coal (Kg / s); F2— carbon dioxide protective gas flow into the gasifier (Nm 3 / s); α 1,C — online measured mass percentage of organic matter C in the pulverized coal.

[0061] S4: using the pulverized coal flow data of the pulverized coal flow time series database (D3), combining the syngas flow data of the syngas flow time series database (D6) and the content of CO, H2 and CH4 in the syngas component time series database (D7), transmitting to the cold coal gas efficiency calculation module (D9) to calculate the cold coal gas efficiency;

[0062] The cold coal gas efficiency η2 used by the cold coal gas efficiency calculation module (D9) is calculated according to the following formula:

[0063]

[0064] Q gr,syn = 12.64γ 1,CO + 12.75 × H2% + 39.8 × CH4% ⑤

[0065] Q gr,daf = 340C daf + 1241.9H daf + 62.7N daf + 190.7S daf - 98.3O daf ⑥

[0066] Wherein, F s —synthesis gas flow (Nm 3 / s); F1—pulverized coal online measurement flow (Kg / s); Q gr,syn —synthesis gas high calorific value (MJ / Nm 3 ); Q gr,daf —dry ash-free basis coal calorific value (kJ / kg); γ 1,CO —CO volume percentage in dry basis synthesis gas at gasifier outlet; C daf —mass fraction of C in dry ash-free basis; H daf —mass fraction of H in dry ash-free basis; N daf —mass fraction of N in dry ash-free basis; O daf —mass fraction of O in dry ash-free basis; S daf —mass fraction of S in dry ash-free basis.

[0067] S5: using carbon conversion rate and cold coal gas efficiency, forming gasifier operation performance database (D10);

[0068] S6: calculating time corresponding relationship of gasifier in-furnace oxygen amount, in-furnace pulverized coal flow time sequence, synthesis gas flow time sequence, coal quality online ash content analysis time sequence, and synthesis gas component time sequence through gasifier operation performance calculation module (D11).

[0069] According to current system clock time setting of gasifier operation performance calculation module, time stamp T1 is set, i.e. corresponding time of carbon conversion rate and cold coal gas efficiency calculation result, corresponding to gasifier in-furnace coal flow, oxygen amount, and carbon dioxide database time sequence; defining coal quality online ash content analysis time sequence T0: corresponding to pulverized coal storage location; defining gasifier synthesis gas flow and component time sequence T2: corresponding to scrubber outlet location; see details in Figure 2 .

[0070] defining time length t2 of pulverized coal detected by coal quality online detection being transported to the gasifier; defining time length t3 of synthesis gas being transported from the gasifier to the scrubber outlet; defining calculation period t: being <t2-t0>; see Figure 2 .

[0071] S7: The data of the gasifier operation performance database (D10) is called by the gasifier operation performance calculation module (D11), and the production optimization value (such as the maximum production of effective gas, the highest carbon conversion rate, the maximum cold coal gas efficiency, the optimal oxygen-coal ratio, etc.) of the coal quality of the gasifier within a certain fluctuation range is obtained, which is used to guide the automatic control and intelligent control of the gasifier.

[0072] The advantages of the present application are as follows: 1. The coal quality is measured online, the pulverized coal flow is corrected online, and the coal quality and flow entering the gasifier are real-time, stable and accurate. 2. The carbon conversion rate of the gasifier can be calculated in real time. 3. The cold coal gas efficiency of the gasifier can be calculated in real time. 4. The optimization control parameters of the gasifier can be compared from the historical database and used for production control.

Claims

1. An online calculation and control method for gasification performance of an entrained-flow gasifier, comprising the following steps: S1: collecting coal quality online element analysis time series data to establish a database (D1); S2: collecting coal flow time series data into the furnace, establishing a database (D3), using a coal density online correction module (D2), calling corresponding data of the coal quality online element analysis time series database (D1), correcting the coal quality density, and then correcting the calculated coal flow into the furnace, to obtain the coal flow time series data into the furnace, and establishing a database (D3); S3: using the coal flow data of the coal flow time series database (D3) into the furnace, combining the carbon dioxide flow data of the carbon dioxide flow database (D5) into the furnace, the syngas flow data of the syngas flow time series database (D6), and the percentage content data of CO and CO2 in the syngas component time series database (D7), and transmitting to a carbon conversion rate calculation module (D8) for carbon conversion rate calculation; S4: using the coal flow data of the coal flow time series database (D3) into the furnace, combining the syngas flow data of the syngas flow time series database (D6), and the content of CO, H2 and CH4 in the syngas component time series database (D7), and transmitting to a cold coal gas efficiency calculation module (D9) for cold coal gas efficiency calculation; S5: using the carbon conversion rate and the cold coal gas efficiency to form a gasifier operation performance database (D10); S6: calculating the time corresponding relationship of the oxygen amount into the furnace, the coal flow time series into the furnace, the syngas flow time series, the coal quality online ash content analysis time series, and the syngas component time series of the gasifier through a gasifier operation performance calculation module (D11); S7: calling the data of the gasifier operation performance database (D10) through the gasifier operation performance calculation module (D11) to obtain the production optimization value (such as the optimal oxygen-coal ratio) of the coal quality of the gasifier within a certain fluctuation range, and communicating to the gasification DCS for automatic control of the optimal oxygen-coal ratio of the gasifier to realize efficient operation of the gasification.

2. The on-line calculation and control method of gasification performance of an entrained-flow gasifier according to claim 1, characterized in that: In step S1, the coal quality online ash component analysis time series data (D1) is derived from a coal quality online analyzer which samples from a pulverized coal atmospheric storage bin 1 to obtain the contents of carbon, hydrogen, oxygen, nitrogen, sulfur, SiO2, CaO, Al2O3, MgO, Fe2O3, K2O, Na2O, MnO2, and TiO2.

3. The on-line gasification performance calculation and control method of the entrained-flow gasifier according to claim 1, characterized in that: In step S2, the correction formula for the density of the pulverized coal used by the pulverized coal density online correction module (D2) is as follows: said p1 - corrected density of the pulverized coal (Kg / m 3 ); a0 - sum of the calibrated mass percentages of the organic substances (C, H, O, N, S, etc.) in the pulverized coal; a1 - sum of the mass percentages of the organic substances (C, H, O, N, S, etc.) measured on-line in the pulverized coal; β0— the sum of the mass percentages of the ash content calibrated in the pulverized coal; β1— the sum of the mass percentages of the ash content measured online in the pulverized coal; p0 - calibrated density of the pulverized coal (Kg / m3) 3 ).

4. The on-line gasification performance calculation and control method of the entrained-flow gasifier according to claim 1, characterized in that: In step S2, the correction formula for the pulverized coal flow used by the pulverized coal density online correction module (D2) is as follows: F1=A×ρ1×v1 ② Wherein, A—piping flow cross-sectional area (m 2 ); F1—pulverized coal online measurement flow (Kg / s); p1—corrected density of pulverized coal (Kg / m 3 ); v1—pulverized coal online measurement flow rate (m / s).

5. The on-line gasification performance calculation and control method of the entrained-flow gasifier according to claim 1, characterized in that: In step S3, the calculation formula for the carbon conversion rate η1 used by the carbon conversion rate calculation module (D8) is as follows: where F s — syngas flow (Nm 3 / s); γ1— sum of the volume percentages of CO and CO2 in the dry basis syngas at the outlet of the gasifier; F1— online measured flow of pulverized coal (Kg / s); F2— flow of carbon dioxide protective gas into the gasifier (Nm 3 / s); α 1,C — online measured mass percentage of organic matter C in the pulverized coal.

6. The on-line gasification performance calculation and control method of the entrained-flow gasifier according to claim 1, characterized in that: In step S4, the calculation formula for the cold coal gas efficiency η2 used by the cold coal gas efficiency calculation module (D9) is as follows: Q gr,syn = 12.64 γ 1,CO + 12.75 x H2% + 39.8 x CH4% ⑤ Q gr,daf = 340 C daf + 1241.9 H daf + 62.7 N daf + 190.7 S daf - 98.3 O daf ⑥ where F s — syngas flow (Nm 3 / s); F1— pulverized coal online measured flow (Kg / s); Q gr,syn — syngas higher heating value (MJ / Nm 3 ); Q gr,daf — dry ash-free basis coal higher heating value (kJ / kg); γ 1,CO — CO volume percentage in dry basis syngas at gasifier outlet; C daf — mass fraction of C in dry ash-free basis; H daf — mass fraction of H in dry ash-free basis; N daf — mass fraction of N in dry ash-free basis; O daf — mass fraction of O in dry ash-free basis; S daf — mass fraction of S in dry ash-free basis.

7. The on-line gasification performance calculation and control method of the entrained-flow gasifier according to claim 1, characterized in that: In step S6, the time stamp T1 corresponding to the time of the carbon conversion rate and the cold gas efficiency calculation result is set according to the current system clock time of the gasifier operation performance calculation module, that is, the time corresponding to the carbon conversion rate and the cold gas efficiency calculation result, the gasifier coal flow, the oxygen content, and the carbon dioxide database time sequence; the coal quality element online analysis time sequence T0 is defined: corresponding to the coal powder storage location; the gasifier synthesis gas flow and component time sequence T2 is defined: corresponding to the scrubber outlet location. The time length t2 of the coal powder transported from the coal quality online detection to the gasifier is defined; the time length t3 of the synthesis gas transported from the gasifier to the scrubber outlet is defined; the calculation period t is defined: the time length of the coal powder from the coal quality online detection to the scrubber outlet, that is, the time length of the coal powder from the coal quality online detection to the gasifier and the time length of the synthesis gas from the gasifier to the scrubber outlet. <t2-t0>If the coal quality element is the ash content, then the on-line analysis T0 of the coal quality element is <t1-t2>The parameters at time <T1+t3>; the syngas component result is the parameter at time <T1+t3>.< / t1-t2>

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