An oxygen to coal ratio control system

Abstract

The present application relates to a kind of oxygen coal ratio control systems, it includes: (1), automatically setting load unit 1;(2), automatically selecting setting value unit 2;(3), oxygen coal ratio setting unit 3;(4), oxygen flow control unit 4;And (5), coal slurry flow control unit 5.

Description

Technical Field

[0001] This invention relates to an oxygen-to-coal ratio control system, applicable to gasification processes that use pumps to pressurize and transport materials, such as coal-water slurry gasification and heavy oil (residue oil) gasification. Background Technology

[0002] The coal-water slurry gasification process boasts advantages such as mature technology, simple process flow, safe and reliable process control, strong adaptability to various coal types, high carbon conversion rate, good quality crude syngas, good environmental performance, low investment in plant construction, and short construction period. In recent years, the coal chemical industry has flourished, and the coal-water slurry gasification process has been widely applied in projects such as coal-to-hydrogen, coal-to-methanol, coal-to-olefins, and coal-to-synthetic ammonia. Numerous coal-water slurry gasification units are already in commercial operation. Since coal-water slurry gasification units are typically upstream units, their shutdown will lead to the interruption of production in downstream units or related facilities, resulting in significant economic losses. Therefore, the safe and stable operation of coal-water slurry gasification units is of paramount importance.

[0003] The most critical parameter affecting the safe and stable operation of a coal-water slurry gasification unit is the ratio of oxygen to coal-water slurry entering the gasifier, also known as the oxygen-to-coal ratio. A low oxygen-to-coal ratio leads to lower gasification reaction temperatures, reduced carbon conversion, higher residual carbon in the ash, poor ash discharge, and even ash blockage, potentially causing a shutdown. Conversely, a high oxygen-to-coal ratio results in higher gasification reaction temperatures, increased CO2 content in the syngas, reduced gasification efficiency, and may even lead to an explosion due to excessive oxygen. Therefore, the oxygen-to-coal ratio is both the most important control parameter and the most crucial interlocking parameter in the gasification process.

[0004] The oxygen-to-coal ratio control in existing coal-water slurry gasification technologies typically employs a cross-limiting control method, which is essentially the same as the combustion control method widely used in boilers. Since the coal-water slurry gasification process uses a slurry pump to pressurize and transport the slurry, and these pumps are usually plunger pumps, the slurry flow rate fluctuates, sometimes significantly, and this fluctuation increases with the age of the unit. If cross-limiting control is used under these conditions, the fluctuation in slurry flow rate will cause fluctuations in oxygen flow rate. Small fluctuations affect the quality of syngas; large fluctuations may lead to over-oxygenation, causing accidental shutdowns or safety accidents. Therefore, the existing oxygen-to-coal ratio control in coal-water slurry gasification units is largely unusable. Many units even lack single-loop automatic control for both slurry and oxygen flow control loops, maintaining manual control. If operators fail to operate the system promptly and correctly, it can lead to anything from accidental shutdowns to serious accidents such as over-oxygenation explosions, posing a significant threat to the safe and stable operation of the gasification unit.

[0005] The Chinese invention patent "Oxygen Feeding Control System and Gasifier Feeding System" with authorization announcement number CN105885949B (application number 2016103923262) only discloses the oxygen feeding process applicable to multi-nozzle opposed gasifiers. It does not explain the oxygen-coal ratio control method, nor can it solve the problem of oxygen flow fluctuation caused by coal slurry flow fluctuation.

[0006] The oxygen-to-coal ratio control method disclosed in the Chinese invention patent "Temperature Control System and Control Method of Fluidized Bed Reactor" with authorization announcement number CN101538485B (application number 2009101198432) still adopts the cross-limiting control method, which cannot solve the problem that the oxygen flow rate fluctuates due to the fluctuation of coal slurry flow rate.

[0007] The oxygen-coal ratio control method disclosed in Chinese invention patent application CN106773718A (application number 2017100542460), entitled "An oxygen-carbon ratio control system and its oxygen-coal ratio control method for gasifier", is applicable to pulverized coal gasification process, but not to coal-water slurry gasification process. It also cannot solve the problem that the oxygen flow rate fluctuates due to the fluctuation of coal slurry flow rate. Summary of the Invention

[0008] The technical problem to be solved by this invention is to provide an oxygen-to-coal ratio control system in light of the aforementioned prior art. This invention can effectively solve the problem of oxygen flow fluctuation caused by coal slurry flow fluctuation. The system has a simple structure and is easy to put into use. It can automatically adjust the gasification load, significantly reduce the labor intensity of operators, and can enter a rapid response mode and quickly stabilize production when an abnormal oxygen-to-coal ratio occurs.

[0009] To solve the above-mentioned technical problems, the present invention provides an oxygen-to-coal ratio control system for a coal-water slurry gasification process, comprising:

[0010] Subsystem I is configured, including:

[0011] (1) Automatic load setting unit 1, which provides gasifier operating status signal 001A and gasifier current load oxygen demand IF O Signal 001B;

[0012] (2) Automatic selection setpoint unit 2, which selects the setpoint based on the gasifier operating status signal 001A and the gasifier current load oxygen demand IF. O Signal 001B, oxygen-to-coal ratio setpoint SR, signal 003A, and coal slurry flow measurement value DF C Signal 005A calculates and provides the oxygen flow control setpoint SF. O Signal 002A, and based on the gasifier operating status signal 001A and the gasifier current load oxygen demand IF OSignal 001B, oxygen-to-coal ratio setpoint SR signal 003A, and oxygen flow measurement value DF O Signal 004A calculates and provides the coal slurry flow control setpoint SF. C Signal 002B; and

[0013] (3) Oxygen-coal ratio setting unit 3, which is based on the oxygen flow rate measurement value DF O Signal 004B and coal slurry flow measurement value DF C Signal 005B calculates the actual oxygen-coal ratio AR and selects it from the predetermined oxygen-coal ratio PR required for the coal-water slurry gasification process, thereby providing the oxygen-coal ratio setpoint signal SR 003A;

[0014] And, control subsystem II, which works in conjunction with the setting subsystem to implement control:

[0015] (4) Oxygen flow control unit 4, which provides the oxygen flow measurement value DF O Signal 004A / B, and based on the oxygen flow rate measurement value DF O and the oxygen flow control setpoint SF O The oxygen supply flow rate is controlled by cascade control; and / or

[0016] (5) Coal slurry flow control unit 5, which provides the coal slurry flow measurement value DF C Signal 005A / B, and based on the measured coal slurry flow rate DF C and the coal slurry flow control setpoint SF C The flow rate of the supplied coal-water slurry is controlled by cascade control.

[0017] For ease of reading, discussion, and understanding, the oxygen-coal ratio control system provided by this invention is divided into units 1-5 as described above in this context. However, it will be readily understood by those skilled in the art that, as long as the oxygen-coal ratio is controlled in accordance with the principles of the control system described in this context to achieve essentially the same function, those skilled in the art can make appropriate modifications to the division of units in the system, the combination of units, and the addition or reduction of elements / features involved in each unit, all of which are within the scope of this invention. In particular, for example, those skilled in the art can implement the control of only unit 4 or unit 5 in accordance with the technical principles provided by this invention.

[0018] In one implementation, in the automatic load setting unit 1, the load lifting module HC-108 provides the current load IL signal of the gasifier, which is then compared with the full-load oxygen flow rate FF. O Multiply to provide the current oxygen demand IF of the gasifier at its current load. OSignal 001B. In one embodiment, at the full-load oxygen flow rate FF O The appropriate size shall be determined by those skilled in the art based on the actual circumstances, depending on the scale of the gasifier.

[0019] In one embodiment, the load increase rate controller HC-105, the load decrease rate controller HC-106, and the gasifier load setting controller HC-107 provide three signal inputs to the load increase / decrease module HC-108. In one embodiment, the gasifier load setting controller HC-107 is used to set the target load TL of the gasifier, which is appropriately determined by those skilled in the art based on the actual situation and the gasifier's scale. In one embodiment, the gasifier load setting controller HC-107 has a tracking control input terminal, and the signal 003B, indicating that the controller controlling the supplied oxygen flow rate in the oxygen flow control unit 4 (e.g., oxygen flow controller FC-109) or the controller controlling the supplied coal-water slurry flow rate in the coal slurry flow control unit 5 (e.g., coal slurry flow controller FC-103) is not in cascade operation mode, is connected to the tracking control input terminal of the gasifier load setting controller HC-107. In one embodiment, the signal 003B indicating that the oxygen flow controller FC-109 or the coal slurry flow controller FC-103 is not in cascade operation mode originates from the oxygen-coal ratio setting unit 3.

[0020] In one embodiment, the signal 003B (the oxygen flow controller FC-109 or coal slurry flow controller FC-103 is not in cascade operation mode), the gasifier liquid level normal signal, and the gasifier shutdown signal are used as control inputs for the load lifting module HC-108. In one embodiment, the load lifting module HC-108 has four control input terminals: a tracking control input terminal, a start control input terminal, a pause control input terminal, and a stop control input terminal. In one embodiment, signal 003B is used for the tracking control input terminal. In one embodiment, the gasifier liquid level normal signal is used for the start control input terminal and the pause control input terminal. In one embodiment, the gasifier shutdown signal is used for the stop control input terminal.

[0021] In one implementation, the current load IL signal of the gasifier provided by the load adjustment module HC-108 is subtracted from the target load TL of the gasifier set by the gasifier load setting controller HC-107, and combined with the oxygen-coal ratio abnormality signal 003C from the oxygen-coal ratio setting unit 3 to obtain the gasifier operating status signal 001A. In one implementation, the gasifier operating status signal 001A is divided into two categories, for example, the first category indicates that the gasifier is in normal operation mode or load reduction mode, and the second category indicates that the gasifier is in load increase mode or oxygen-coal ratio abnormality.

[0022] In one implementation, in the automatic selection setpoint unit 2, the oxygen-to-coal ratio setpoint SR and the coal slurry flow rate measurement value DF are used. C Multiply by this to obtain the oxygen flow control calculation value CF. O Further, the oxygen signal selection module FY8-110 selects the current oxygen demand IF of the gasifier under its current load. O Or the oxygen flow control calculation value CF O Make a selection and set the IF O or CF O As the oxygen flow control setpoint SF O In one implementation, the IF O or CF O The selection is made by the oxygen signal selection module FY8-110 based on the gasifier operating status signal 001A.

[0023] In one implementation, the coal slurry signal selection module FY8-103 selects the current load oxygen demand IF of the gasifier. O Or oxygen flow rate measurement DF O By making a selection, the required calculated value CF for the coal slurry flow rate is obtained. C Further calculations based on the required coal slurry flow rate CF C Divide by the oxygen-to-coal ratio setpoint SR to obtain the coal slurry flow control setpoint SF. C In one implementation, the IF O or DF O The selection is made by the coal slurry signal selection module FY8-103 based on the gasifier operating status signal 001A.

[0024] In one implementation, in the oxygen-coal ratio setting unit 3, the oxygen flow rate measurement value DF is used. O Divide by the measured coal slurry flow rate DF C The actual oxygen-to-coal ratio AR is obtained.

[0025] In one implementation, the oxygen-coal ratio signal selection module 12HY8-102 selects either the actual oxygen-coal ratio AR or the predetermined oxygen-coal ratio PR, and uses AR or PR as the oxygen-coal ratio setpoint SR. In another implementation, the selection of AR or PR is determined by whether the oxygen flow controller FC-109, the oxygen flow rapid controller FC-110, or the coal slurry flow controller FC-103 of the oxygen flow control unit 4 are all not in cascade operation mode.

[0026] In one implementation, an oxygen-to-coal ratio anomaly judgment setpoint UR is provided, whose value is represented by XX and determined according to the actual coal type being operated, for example, a value between 510 and 530, such as approximately 520. When the actual oxygen-to-coal ratio AR is greater than XX, it indicates "oxygen-to-coal ratio anomaly", and one or more oxygen-to-coal ratio anomaly signals are generated accordingly. For example, oxygen-to-coal ratio anomaly signal 003C is sent to the automatic load setting unit 1, oxygen-to-coal ratio anomaly signal 003D is sent to the oxygen flow control unit 4, and / or oxygen-to-coal ratio anomaly signal 003E is sent to the coal slurry flow control unit 5.

[0027] In one implementation, the oxygen flow rate of the coal-water slurry gasification process is measured by an oxygen flow transmitter FT-109 in the oxygen flow control unit 4, for use in the oxygen flow rate measurement value DF. O Signal 004A / B. Preferably, in one embodiment, three oxygen flow transmitters FT-109A to C are provided, and the middle value of their measurement signals is selected. Preferably, in one embodiment, the measurement signals of the oxygen flow transmitters FT-109 are subjected to temperature and pressure compensation, and the temperature and pressure compensated signal is used as the oxygen flow measurement value DF. O Signal 004A / B. In one embodiment, three oxygen flow transmitters FT-109A to C are used. The measurement signals from each oxygen flow transmitter are first compensated for temperature and pressure, and then the compensated signals are selected from the three signals. Alternatively, in another embodiment, three oxygen flow transmitters FT-109A to C are used. The three flow measurement signals are first selected from the three signals, and then the selected measurement signal is compensated for temperature and pressure. In one embodiment, there are no particular restrictions on the installation location of the oxygen flow transmitter FT-109, as well as the oxygen pressure transmitter and oxygen temperature transmitter used for temperature and pressure compensation; they can be installed in conventional locations in the art. For example, the oxygen flow transmitter FT-109 is installed on an oxygen throttling device.

[0028] In one implementation scheme, the oxygen flow rate measurement value DF O and the oxygen flow control setpoint SF O The FC-109 is a cascade control oxygen flow controller. In one implementation, the oxygen flow rate is controlled by the measured value DF. O and the oxygen flow control setpoint SF OA cascaded oxygen flow rate fast controller FC-110 is used. In one embodiment, a control signal selection module 12FY8-109 selects either the oxygen flow rate control signal output by the oxygen flow rate controller FC-109 or the oxygen flow rate fast control signal output by the oxygen flow rate fast controller FC-110, and uses the selected control signal to control the oxygen flow rate. In one embodiment, the selection of the oxygen flow rate control signal or the oxygen flow rate fast control signal is determined by an oxygen-coal ratio anomaly signal. For example, in one embodiment, when an oxygen-coal ratio anomaly signal occurs, the oxygen flow rate is controlled by the oxygen flow rate fast control signal output by the oxygen flow rate fast controller FC-110; when no oxygen-coal ratio anomaly signal occurs, the oxygen flow rate is controlled by the oxygen flow rate control signal output by the oxygen flow rate controller FC-109.

[0029] In one embodiment, the coal slurry flow rate of the coal-water slurry gasification process is measured by a coal slurry flow meter FT-103 in the coal slurry flow control unit 5, for use in the coal slurry flow rate measurement value DF. C Signal 005A / B. Preferably, in one embodiment, three coal slurry flow meters FT-103A to C are used, and the middle value of their measurement signals is taken as the coal slurry flow measurement value DF. C Signal 005A / B.

[0030] In one implementation, the coal slurry flow rate measurement value DF C and the coal slurry flow control setpoint SF C A cascaded coal slurry flow controller FC-103 is used to control the coal slurry flow rate. In one implementation, when the oxygen-to-coal ratio abnormality signal is 1, the operating mode of the coal slurry flow controller FC-103 is forcibly set to manual operation mode.

[0031] Compared with the prior art, the advantages of the present invention are as follows:

[0032] (1) It can effectively solve the problem of oxygen flow fluctuation caused by coal slurry flow fluctuation;

[0033] (2) The system is simple in structure and easy to deploy;

[0034] (3) It can automatically increase or decrease the gasification load, greatly reducing the labor intensity of operators;

[0035] (4) It can enter a rapid response mode and quickly stabilize production when the oxygen-coal ratio is abnormal, which can not only ensure the safety of the equipment, but also effectively avoid unplanned shutdowns of the equipment. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the automatic load setting unit 1 according to the present invention.

[0037] Figure 2 This is a schematic diagram of the automatic selection setting unit 2 according to the present invention.

[0038] Figure 3 This is a schematic diagram of the oxygen-coal ratio setting unit 3 according to the present invention.

[0039] Figure 4 This is a schematic diagram of the oxygen flow control unit 4 according to the present invention.

[0040] Figure 5 This is a schematic diagram of the coal slurry flow control unit 5 according to the present invention. Detailed Implementation

[0041] The specific embodiments of the present invention will be described in detail below. However, it should be noted that the scope of protection of the present invention is not limited to these specific embodiments, but is determined by the claims in the appendix.

[0042] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, including definitions, this specification shall prevail.

[0043] When this specification describes materials, methods, components, apparatus, or devices using terms such as "known to those skilled in the art" or "conventional in the art" or similar expressions, such terms mean that this specification includes those conventionally used in the art at the time of filing of this application, but also those that are not currently commonly used, but will become generally accepted in the art for similar purposes.

[0044] The term "coal-water slurry" as used in this specification has a meaning and reference known in the art, generally referring to a coal-based fuel in which coal, water, and optional additives are mixed in a certain amount, in slurry form, and which can be pumped, atomized, stored, and stably ignited and burned. In particular, for the purposes of this invention, the terms "coal-water slurry" and "coal slurry" are used interchangeably.

[0045] The term "gasification furnace" as used in this invention has a meaning and reference known in the art. It generally refers to a device that allows gasification raw materials and gasification agents to undergo a gasification reaction, converting them into gaseous products and a small amount of residue, and that cools and washes the high-temperature gas and residue. The gasification agent is mainly water vapor, air (oxygen), or a mixture thereof. The gasification furnace includes a gasification chamber (or reaction chamber, combustion chamber) at the top and a quench chamber at the bottom.

[0046] In this manual, the relevant components of each unit will receive and / or generate various technical parameters, such as the current load oxygen demand IF of the gasifier designed by the automatic selection setpoint unit 2.O Oxygen-to-coal ratio setpoint SR and coal slurry flow rate measurement value DF C And so on, and these parameters will be transmitted by corresponding signals, such as the oxygen demand IF for the current load of the gasifier. O Signal 001B, signal 003A for oxygen-to-coal ratio setpoint SR, and signal DF for coal slurry flow measurement. C Signals. Those skilled in the art will understand that the parameters and their signals are distinguished in this specification, but for the convenience of discussion and understanding, the parameters and their signals may sometimes be used interchangeably or interchangeably, as long as those skilled in the art understand their actual referents.

[0047] Finally, unless otherwise specified, all percentages, parts, ratios, etc. mentioned in this specification are based on weight, unless being based on weight would not be in accordance with the common understanding of those skilled in the art.

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] like Figures 1 to 5 As shown, the oxygen-coal ratio control loop in this embodiment includes an automatic load setting unit, an automatic setpoint selection unit, an oxygen-coal ratio setting unit, an oxygen flow control unit, and a coal slurry flow control unit.

[0050] (1) See Figure 1 In an illustrative, rather than limiting, implementation, the loop configuration and control, and logic relationships of load unit 1 are automatically set as follows:

[0051] The automatic load setting unit includes a load increase rate controller HC-105, a load decrease rate controller HC-106, a gasifier load setting controller HC-107, a load increase / decrease module HC-108, a subtractor HY3-107, a multiplier HY4-108, pulse generators P1 to P3, AND gates AN1 to AN2, OR gates OR1 to OR4, NOT gates NO1 to NO2, a trigger RS1, a judgment module Q1 to Q3, and a delay module T.

[0052] In one embodiment, the gasifier load setting controller HC-107 is provided with a tracking control input terminal. In another embodiment, the load raising / lowering module HC-108 is provided with four control input terminals: a tracking control input terminal, a start control input terminal, a pause control input terminal, and a stop control input terminal. In yet another embodiment, the load raising / lowering module HC-108 is also provided with three signal input terminals: a load increase rate input terminal, a load decrease rate input terminal, and a target value input terminal.

[0053] In one embodiment, the load increase rate controller HC-105 is used to set the load increase rate of the gasifier, and its output is connected to the load increase rate input of the load increase module HC-108; the load decrease rate controller HC-106 is used to set the load decrease rate of the gasifier, and its output is connected to the load decrease rate input of the load increase module HC-108. In another embodiment, the gasifier load setting controller HC-107 is used to set the target load TL of the gasifier, and its output is connected to the target value input of the load increase module HC-108 and the input a of the subtractor HY3-107, respectively.

[0054] In one embodiment, the start button is connected to the input of pulse generator P1, and the output of pulse generator P1 is connected to the first input of AND gate AN1; the normal liquid level signal from the gasifier in the interlocking system is connected to the second input of AND gate AN1 and the input of NOT gate NO1; the output of AND gate AN1 is connected to the start control input of load lifting module HC-108. In another embodiment, the output of NOT gate NO1 is connected to the first input of OR gate OR1; the pause button is connected to the input of pulse generator P2, and the output of pulse generator P2 is connected to the second input of OR gate OR1; the output of OR gate OR1 is connected to the pause control input of load lifting module HC-108. The gasifier stop signal from the interlocking system is connected to the first input of OR gate OR2; the stop button is connected to the input of pulse generator P3, and the output of pulse generator P3 is connected to the second input of OR gate OR2; the output of OR gate OR2 is connected to the stop control input of load lifting module HC-108. Those skilled in the art will know and be able to determine that, in one or more embodiments, the logic circuit can be appropriately adjusted, as long as it can provide the start control input of the load lifting module HC-108 through logic operations based on the gasifier liquid level normal signal and the start button, provide the pause control input of the load lifting module HC-108 through logic operations based on the gasifier liquid level normal signal and the pause button, and / or provide the stop control input of the load lifting module HC-108 through logic operations based on the gasifier stop signal and the stop button.

[0055] In one implementation, the output signal of the load adjustment module HC-108 is the current load IL of the gasifier, and its output terminal is connected to the first input terminal of the multiplier HY4-108 and the b input terminal of the subtractor HY3-107, respectively; the full-load oxygen flow rate FF O Connect to the second input terminal of multiplier HY4-108; the output terminal of multiplier HY4-108 is connected to the automatic selection setpoint unit, and its output result is the current oxygen demand (IF) of the gasifier under load. O And the current oxygen demand (IF) of the gasifier at the current load OSignal 001B is sent to the automatic selection setpoint unit.

[0056] In one implementation, the output of subtractor HY3-107 is ab, which is the difference between the target load TL set by the gasifier load setting controller HC-107 and the current gasifier load IL output by the load increase / decrease module HC-108. The output of subtractor HY3-107 is connected to the input of judgment modules Q1, Q2, and Q3 respectively; the set value of judgment modules Q1, Q2, and Q3 is 0; when the output of subtractor HY3-107 is less than 0, the output of judgment module Q1 is 1 and displays "Gasifier load reduction", otherwise its output is 0; when the output of subtractor HY3-107 is equal to 0, the output of judgment module Q2 is 1 and displays "Gasifier normal operation", otherwise its output is 0; when the output of subtractor HY3-107 is greater than 0, the output of judgment module Q3 is 1 and displays "Gasifier load increase", otherwise its output is 0.

[0057] In one implementation, the output of judgment module Q1 is connected to the first input of OR gate OR3; the output of judgment module Q2 is connected to the input of delay module T, and the output of delay module T is connected to the second input of OR gate OR3. The function of delay module T is to delay conduction, and the set time is a value between 3 and 10 minutes, such as 3 minutes, 5 minutes, or 8 minutes, or other suitable time determined according to actual production; the output of OR gate OR3 is connected to the first input of AND gate AN2; the oxygen-coal ratio abnormal signal 003C from the oxygen-coal ratio setting unit is connected to the input of NOT gate NO2 and the first input of OR gate OR4 respectively; the output of NOT gate NO2 is connected to the second input of AND gate AN2; the output of judgment module Q3 is connected to the second input of OR gate OR4; the output of AND gate AN2 is connected to the S input of trigger RS1, and the output of OR gate OR4 is connected to the R input of trigger RS1; the output of trigger RS1 is connected to the automatic selection setpoint unit, and its output result indicates the gasifier operating status, which is sent to the automatic selection setpoint unit as the gasifier operating status signal 001A. When the output of trigger RS1 is 1, it indicates that the gasifier is in normal operation mode or load reduction mode; when the output of trigger RS1 is 0, it indicates that the gasifier is in load increase mode or the oxygen-coal ratio is abnormal. The R input terminal of trigger RS1 has a higher priority than the S input terminal. Those skilled in the art will understand that, in one embodiment, the logic circuit can be appropriately adjusted so that the output of trigger RS1 is different from or even opposite to the aforementioned exemplified embodiment. For example, the output of trigger RS1 could be 0 indicating that the gasifier is in normal operation mode or load reduction mode, and 1 indicating that the gasifier is in load increase mode or the oxygen-coal ratio is abnormal; as long as the output of trigger RS1 is divided into two categories (where the first category is the gasifier being in normal operation mode or load reduction mode, and the second category is the gasifier being in load increase mode or the oxygen-coal ratio is abnormal), it is acceptable.

[0058] In one implementation, the signal 003B, indicating that FC-109 or FC-103 is not in cascade operation mode, from the oxygen-coal ratio setting unit is connected to the tracking control input of the gasifier load setting controller HC-107 and the tracking control input of the load lifting module HC-108, respectively. When the signal indicating that FC-109 or FC-103 is not in cascade operation mode is 1, the output signals of the gasifier load setting controller HC-107 and the load lifting module HC-108 track the oxygen flow measurement value FI-109 divided by the full-load oxygen flow rate FF. O The result (not shown in the figure).

[0059] The HC-108 load lifting module operates at intervals between 3 and 10 seconds, such as 3 seconds, 6 seconds, or 8 seconds, or other suitable times determined based on actual production conditions, during load lifting or load lowering.

[0060] (2) See Figure 2 In an illustrative, rather than limiting, implementation, the loop configuration and control, and logic relationship of the automatic selection setpoint unit are as follows:

[0061] In one implementation, the automatic selection setpoint unit includes a coal slurry signal selection module FY8-103, an oxygen signal selection module FY8-110, a divider FY4-103, and a multiplier FY4-109.

[0062] In one implementation, the gasifier operating status signal 001A from the automatic load setting unit is connected to the S control terminal of the coal slurry signal selection module FY8-103 and the S control terminal of the oxygen signal selection module FY8-110, respectively; the gasifier current load oxygen demand IF from the automatic load setting unit... O Signal 001B is connected to the b input terminal of the coal slurry signal selection module FY8-103 and the a input terminal of the oxygen signal selection module FY8-110, respectively; the oxygen flow measurement value signal 004A from the oxygen flow control unit is connected to the a input terminal of the coal slurry signal selection module FY8-103.

[0063] In one implementation, the coal slurry flow measurement value DF from the coal slurry flow control unit C Signal 005A is connected to the first input terminal of multiplier FY4-109; the oxygen-coal ratio setting value SR signal 003A from the oxygen-coal ratio setting unit is connected to the second input terminal of multiplier FY4-109 and the b input terminal of divider FY4-103 respectively; the output signal of multiplier FY4-109 is the oxygen flow control calculation value CF. O This output terminal is connected to the b input terminal of the oxygen signal selection module FY8-110.

[0064] In one implementation, the control function of the oxygen signal selection module FY8-110 is as follows: when s=1 (the gasifier is in normal operation mode or load reduction mode), the output result c=a (current load oxygen demand of the gasifier IF) is executed. O Signal 001B); When s=0 (gasifier is in load increase mode or oxygen-coal ratio is abnormal), the output result c=b (oxygen flow control calculation value CF) O The output terminal C of the oxygen signal selection module FY8-110 is connected to the oxygen flow control unit, and its output is the oxygen flow control setpoint SF. O Signal 002A.

[0065] In one implementation, the control function of the coal slurry signal selection module FY8-103 is as follows: when s=1, the output result c=a; when s=0, the output result c=b. The output terminal c of the coal slurry signal selection module FY8-103 is connected to the input terminal a of the divider FY4-103; the output result of the divider FY4-103 is a÷b, which is the coal slurry flow control setpoint SF. C Signal 002B, its output is connected to the coal slurry flow control unit.

[0066] (3) See Figure 3 In an illustrative, and not limiting, implementation, the loop configuration, control, and logic of the oxygen-to-coal ratio setting unit are as follows:

[0067] In one implementation, the oxygen-coal ratio setting unit includes an oxygen-coal ratio setting controller HC-102, a speed limiter HY9-102, a signal selection module HY8-102, a divider FFY4-109, an indicator module FFI-109, a pulse generator P4, an AND gate AN3, an OR gate OR5, NOT gates NO3-NO4, a trigger SR1, and a judgment module Q4.

[0068] In one implementation, both the oxygen-to-coal ratio setting controller HC-102 and the speed limiter HY9-102 are equipped with tracking control input terminals.

[0069] In one implementation, the oxygen flow measurement signal 004B from the oxygen flow control unit is connected to input terminal a of the divider FFY4-109; the coal slurry flow measurement signal DF from the coal slurry flow control unit... CSignal 005B is connected to input terminal b of divider FFY4-109; the output of divider FFY4-109 is a÷b, which is the actual oxygen-coal ratio AR, and its output is connected to indicator module FFI-109; the output of indicator module FFI-109 is connected to input terminal a of signal selection module HY8-102 and input terminal of judgment module Q4, respectively. The set value of judgment module Q4 is determined according to the actual coal type, represented by XX; when the output of indicator module FFI-109 is greater than XX, the output of judgment module Q4 is 1, otherwise its output is 0. In one implementation, the output of the judgment module Q4 is connected to the S input of the trigger SR1; the oxygen-coal ratio abnormality reset button is connected to the input of the pulse generator P4, and the output of the pulse generator P4 is connected to the R input of the trigger SR1; the output of the trigger SR1 is connected to the automatic load setting unit, the oxygen flow control unit, and the coal slurry flow control unit respectively, and its output result indicates the status of the actual oxygen-coal ratio AR. When the output result of the trigger SR1 is 1, it indicates that the oxygen-coal ratio is abnormal and displays "Oxygen-coal ratio abnormal". Correspondingly, an oxygen-coal ratio abnormality signal 003C is generated and sent to the automatic load setting unit, 003D is sent to the oxygen flow control unit, and 003E is sent to the coal slurry flow control unit. When the output result of the trigger SR1 is 0, it indicates that the oxygen-coal ratio is normal. The S input of the trigger SR1 has a higher priority than the R input.

[0070] In one implementation, the oxygen-coal ratio setting controller HC-102 is used to set the oxygen-coal ratio of the gasifier. It outputs a predetermined oxygen-coal ratio PR and is connected to the input terminal of the speed limiter HY9-102. The speed limiter HY9-102 outputs the oxygen-coal ratio setting value SR according to a preset allowable change rate. The allowable change rate is determined according to the actual coal type. The output terminal of the speed limiter HY9-102 is connected to the b input terminal of the signal selection module HY8-102.

[0071] In one embodiment, the cascade operation mode signal 004F of FC-110 from the oxygen flow control unit is connected to the first input of OR gate OR5; the cascade operation mode signal 004E of FC-109 from the oxygen flow control unit is connected to the second input of OR gate OR5 and the second input of AND gate AN3, respectively; the cascade operation mode signal 005E of FC-103 from the coal slurry flow control unit is connected to the third input of OR gate OR5 and the first input of AND gate AN3, respectively; the output of AND gate AN3 is connected to the input of NOT gate NO4; the output of NOT gate NO4 is connected to the automatic load setting unit, and the output of NOT gate NO4 is the cascade operation mode signal 003B of FC-109 or FC-103 not in cascade operation mode.

[0072] In one implementation, the output of OR gate OR5 is connected to the input of NOT gate NO3; the output of NOT gate NO3 is connected to the tracking control input of oxygen-coal ratio setting controller HC-102, the tracking control input of speed limiter HY9-102, and the s control terminal of signal selection module HY8-102, respectively. The output of NOT gate NO3 is a signal that FC-103, FC-109, and FC-110 are not in cascade operation mode. When the signal that FC-103, FC-109, and FC-110 are not in cascade operation mode is 1, the output signals of oxygen-coal ratio setting controller HC-102 and speed limiter HY9-102 track the output result of FFI-109.

[0073] In one implementation, the control function of the signal selection module HY8-102 is as follows: when s=1, the output result c=a; when s=0, the output result c=b. The output terminal c of the signal selection module HY8-102 is connected to the automatic selection setpoint unit, and its output result is the oxygen-coal ratio setpoint SR. The oxygen-coal ratio setpoint signal SR 003A is sent to the automatic selection setpoint unit.

[0074] (4) See Figure 4 In an illustrative, and not limiting, implementation, the loop configuration and control / logic relationships of the oxygen flow control unit are as follows:

[0075] In one embodiment, the oxygen flow control unit includes an oxygen flow controller FC-109, an oxygen flow fast controller FC-110, a signal selection module FY8-109, a three-way neutralization module FY6-109, a temperature and pressure compensation module FY2-109A~C, and an indication module PI-109, TI-109, FI-109, FI-109A~C.

[0076] In one implementation, the relevant field equipment includes an oxygen pressure transmitter PT-109, an oxygen temperature transmitter TT-109, an oxygen throttling device FE-109, oxygen flow transmitters FT-109A to C, and an oxygen flow regulating valve FV-109.

[0077] In one embodiment, oxygen flow transmitters FT-109A to FT-109C are all installed on the oxygen throttling device FE-109. The measurement signal of oxygen flow transmitter FT-109A is connected to the input terminal of temperature and pressure compensation module FY2-109A, and the measurement signal of oxygen flow transmitter FT-109B is connected to the input terminal of temperature and pressure compensation module FY2-109B. In another embodiment, the measurement signal of oxygen flow transmitter FT-109C is connected to the input terminal of temperature and pressure compensation module FY2-109C.

[0078] The measurement signal of the oxygen pressure transmitter PT-109 is connected to the input terminal of the indicating module PI-109. The output terminal of PI-109 is connected to the P compensation terminal of the temperature and pressure compensation modules FY2-109A, FY2-109B, and FY2-109C, respectively. The measurement signal of the oxygen temperature transmitter TT-109 is connected to the input terminal of the indicating module TI-109. The output terminal of TI-109 is connected to the T compensation terminal of the temperature and pressure compensation modules FY2-109A, FY2-109B, and FY2-109C, respectively.

[0079] In one implementation, the output of temperature and pressure compensation module FY2-109A is connected to the input of indicator module FI-109A, the output of temperature and pressure compensation module FY2-109B is connected to the input of indicator module FI-109B, and the output of temperature and pressure compensation module FY2-109C is connected to the input of indicator module FI-109C. The output of indicator module FI-109A is connected to the first input of the three-mode module FY6-109, the output of indicator module FI-109B is connected to the second input of the three-mode module FY6-109, and the output of indicator module FI-109C is connected to the third input of the three-mode module FY6-109. The output of the three-mode module FY6-109 is connected to the input of indicator module FI-109, and the output of FI-109 is the oxygen flow measurement signal.

[0080] In one embodiment, the oxygen flow measurement signal is connected to the PV input terminal of the oxygen flow controller FC-109, the PV input terminal of the oxygen flow fast controller FC-110, and is sent as oxygen flow measurement signal 004A to the automatic selection setpoint unit and as oxygen flow measurement signal 004B to the oxygen-coal ratio setting unit.

[0081] In one implementation, the oxygen flow control setpoint SF from the automatic selection setpoint unit O Signal 002A is connected to the SP input terminal of oxygen flow controller FC-109 and the SP input terminal of oxygen flow fast controller FC-110 respectively; the MV output terminal of oxygen flow controller FC-109 is connected to the b input terminal of signal selection module FY8-109, and the MV output terminal of oxygen flow fast controller FC-110 is connected to the a input terminal of signal selection module FY8-109.

[0082] In one implementation, the oxygen flow controller FC-109 operates in cascade mode, with the FC-109 cascade mode signal state 1, and is connected to the oxygen-coal ratio setting unit as the FC-109 cascade mode signal 004E. The oxygen flow rapid controller FC-110 operates in cascade mode, with the FC-110 cascade mode signal state 1, and is connected to the oxygen-coal ratio setting unit as the FC-110 cascade mode signal 004F.

[0083] In one implementation, the oxygen-coal ratio abnormality signal 003D from the oxygen-coal ratio setting unit is connected to the S control terminal of the signal selection module FY8-109, the operating mode control terminal of the oxygen flow controller FC-109, and the operating mode control terminal of the oxygen flow rapid controller FC-110, respectively. When the oxygen-coal ratio abnormality signal is 1, the operating mode of the oxygen flow controller FC-109 is forcibly set to manual operation mode, and the oxygen flow rapid controller FC-110 is forcibly set to cascade operation mode.

[0084] In one implementation, the control function of the signal selection module FY8-109 is as follows: when s=1 (abnormal oxygen-coal ratio), the output result c=a (MV output signal of the oxygen flow rapid controller FC-110); when s=0, the output result c=b (MV output signal of the oxygen flow controller FC-109). The output terminal c of the signal selection module FY8-109 is connected to the oxygen flow regulating valve FV-109.

[0085] In one implementation scheme, the proportional, integral, and derivative parameters of the oxygen flow controller FC-109 are set in a manner conducive to control stability, and the proportional, integral, and derivative parameters of the oxygen flow fast controller FC-110 are set in a manner conducive to rapid response.

[0086] (5) See Figure 5 In an illustrative, and not limiting, implementation, the loop configuration and control / logic relationships of the coal slurry flow control unit are as follows:

[0087] In one embodiment, the coal slurry flow control unit includes a coal slurry flow controller FC-103, a three-center module FY6-103, a temperature and pressure compensation module FY2-109A~C, and an indicator module FI-103, FI-103A~C.

[0088] In one implementation, the relevant field equipment includes coal slurry flow meters FT-103A~C and coal slurry feed pump frequency converters SC-103.

[0089] In one implementation, coal slurry flow meter FT-103A is connected to indicator module FI-103A, coal slurry flow meter FT-103B is connected to indicator module FI-103B, and coal slurry flow meter FT-103C is connected to indicator module FI-103C. The output of indicator module FI-103A is connected to the first input of the three-mode module FY6-103, the output of indicator module FI-103B is connected to the second input of the three-mode module FY6-103, the output of indicator module FI-103C is connected to the third input of the three-mode module FY6-103, and the output of the three-mode module FY6-103 is connected to the input of indicator module FI-103. The output of FI-103 is the measured coal slurry flow rate DF. C Signal.

[0090] In one implementation, the coal slurry flow measurement value DF C The signal is connected to the PV input terminal of the FC-103 coal slurry flow controller and outputs the coal slurry flow measurement value DF. C Signal 005A is sent to the automatic selection setpoint unit and the coal slurry flow measurement value DF. C Signal 005B is sent to the oxygen-coal ratio setting unit.

[0091] In one implementation, the coal slurry flow control setpoint SF from the automatic selection setpoint unit C Signal 002B is connected to the SP input terminal of the coal slurry flow controller FC-103.

[0092] In one implementation, the coal slurry flow controller FC-103 operates in cascade mode, the FC-103 is in cascade mode signal state 1, and the FC-103 is in cascade mode signal 005E is connected to the oxygen-coal ratio setting unit.

[0093] In one implementation, the MV output of the coal slurry flow controller FC-103 is connected to the frequency converter SC-103 of the coal slurry feed pump.

[0094] In one implementation, the oxygen-coal ratio abnormality signal 003E from the oxygen-coal ratio setting unit is connected to the operating mode control terminal of the coal slurry flow controller FC-103. When the oxygen-coal ratio abnormality signal is 1, the operating mode of the coal slurry flow controller FC-103 is forcibly set to manual operation mode.

[0095] Normal operation of the oxygen-coal ratio control system according to the present invention includes the following exemplary embodiments, and combinations of two or more of these exemplary embodiments:

[0096] (1) When the gasifier is shut down, FC-103, FC-109, FC-110 and HC-108 are in the off state.

[0097] (2) During the preparation and operation of the engine, switch FC-103 and FC-109 to manual operation mode, FC-110 to the off state, and HC-108, HC-107, HC-102 and HY9-102 to tracking mode.

[0098] (3) After the start-up is completed, switch FC-103, FC-109 and FC-110 to automatic operation mode, and HC-108, HC-107, HC-102 and HY9-102 to tracking mode. The oxygen-coal ratio control system will display "Gasifier is running normally".

[0099] (4) After FC-103, FC-109, and FC-110 have been in automatic operation mode and have been stable for a period of time, they can be prepared for load increase operation according to production needs. First, switch FC-103 and FC-109 to cascade operation mode, while FC-110 remains in automatic operation mode; second, set the target value for load increase through HC-107; then, check whether the setting of HC-105 is appropriate. If the setting is appropriate, press the "start button". The oxygen-coal ratio control system will automatically increase the gasifier load to the target value set by HC-107 according to the set load increase rate; during the load increase process, the oxygen-coal ratio control system will continuously display "Gasifier load increase". After the load increase operation is completed, it will display "Gasifier normal operation".

[0100] (5) If the device needs to reduce the operating load. First, set the target value for load reduction through HC-107; then, check whether the setting of HC-106 is appropriate. If the setting is appropriate, press the "Start" button. The oxygen-coal ratio control system will automatically reduce the gasifier load to the target value set by HC-107 according to the set load reduction rate. During the load reduction process, the oxygen-coal ratio control system will continuously display "Gasifier load reduction". After the load reduction operation is completed, it will display "Gasifier normal operation".

[0101] (6) During operation, the oxygen-coal ratio can be adjusted according to the coal type or actual working conditions. During operation, simply adjust the setting value of HC-102. HY9-102 will output the oxygen-coal ratio setting value SR according to the preset allowable change rate to automatically select the setting value unit.

[0102] During operation, when the output of indicator module FFI-109 is greater than XX, the output of judgment module Q4 is 1, and the output of trigger SR1 immediately flips to 1, displaying "Oxygen-coal ratio abnormal". FC-110 is switched to cascade operation mode, and FC-103 and FC-109 are switched to manual operation mode. The output of signal selection module FY8-109 is switched to the MV value of FC-110. Simultaneously, the output of trigger RS1 immediately flips to 0, the output of oxygen signal selection module FY8-110 is switched to the output of multiplier FY4-109, and FC-110 will begin to rapidly adjust the oxygen flow rate to ensure the safety of the gasification unit.

[0103] Once the output of the indicator module FFI-109 returns to normal, the oxygen-coal ratio control system can be reactivated. The operating steps are as follows:

[0104] (1) When the “Oxygen-Coal Ratio Abnormal Reset Button” is pressed, the output of trigger SR1 immediately flips to 0, and the output of signal selection module FY8-109 switches to the MV value of FC-109; at the same time, the output of trigger RS1 immediately flips to 1, and the output of oxygen signal selection module FY8-110 switches to the current load oxygen demand of the gasifier IF. O The output of the coal slurry signal selection module FY8-103 is switched to the oxygen flow measurement value.

[0105] (2) Switch FC-103, FC-109, and FC-110 to automatic operation mode.

[0106] (3) After FC-103, FC-109 and FC-110 are in automatic operation mode and have been stable for a period of time, switch FC-103 and FC-109 to cascade operation mode, while FC-110 remains in automatic operation mode. After that, the load can be increased or decreased or normal operation can be maintained as needed.

[0107] The concept of the invention has been described above with reference to specific embodiments. However, those skilled in the art will understand that various modifications and alterations can be made without departing from the scope of the invention as defined in the appended claims. Therefore, the specification and drawings should be considered illustrative rather than restrictive, and all such modifications and alterations should be covered within the scope of the invention.

[0108] It is understood that certain features described herein as independent multiple embodiments for clarity may also be provided as a combination in a single embodiment. Conversely, multiple different features described herein as a single embodiment for brevity may also be provided individually or in any sub-combination.

Claims

1. An oxygen-to-coal ratio control system for a coal-water slurry gasification process, comprising: Subsystem I is configured, including: (1) Automatic load setting unit 1, which provides gasifier operating status signal 001A and gasifier current load oxygen demand IF O Signal 001B; (2) Automatic selection setpoint unit 2, which selects the setpoint based on the gasifier operating status signal 001A and the gasifier current load oxygen demand IF. O Signal 001B, oxygen-to-coal ratio setpoint SR signal 003A, and coal slurry flow measurement value DF C Signal 005A calculates and provides the oxygen flow control setpoint SF. O Signal 002A, and based on the gasifier operating status signal 001A and the gasifier current load oxygen demand IF O Signal 001B, oxygen-to-coal ratio setpoint SR signal 003A, and oxygen flow measurement value DF O Signal 004A calculates and provides the coal slurry flow control setpoint SF. C Signal 002B; and (3) Oxygen-coal ratio setting unit 3, which is based on the oxygen flow rate measurement value DF O Signal 004B and coal slurry flow measurement value DF C Signal 005B calculates the actual oxygen-coal ratio AR and selects it from the predetermined oxygen-coal ratio PR required for the coal-water slurry gasification process, thereby providing the oxygen-coal ratio setpoint SR signal 003A; And, control subsystem II, which works in conjunction with the setting subsystem to implement control: (4) Oxygen flow control unit 4, which provides the oxygen flow measurement value DF O Signal 004A / B, and based on the oxygen flow rate measurement value DF O and the oxygen flow control setpoint SF O The oxygen supply flow rate is controlled by cascade control; and / or (5) Coal slurry flow control unit 5, which provides the coal slurry flow measurement value DF C Signal 005A / B, and based on the measured coal slurry flow rate DF C and the coal slurry flow control setpoint SF C The flow rate of the supplied coal-water slurry is controlled by cascade control. In the oxygen-coal ratio setting unit 3, the oxygen flow rate measurement value DF is used. O Divide by the measured coal slurry flow rate DF C The actual oxygen-coal ratio AR is obtained. The oxygen-coal ratio signal selection module 12HY8-102 selects either the actual oxygen-coal ratio AR or the predetermined oxygen-coal ratio PR, and uses AR or PR as the oxygen-coal ratio setpoint SR. In the automatic load setting unit 1, the current load IL signal of the gasifier is provided by the load lifting module HC-108, and it is compared with the full-load oxygen flow rate FF. O Multiply to provide the current oxygen demand IF of the gasifier at its current load. O Signal 001B; The current load IL signal of the gasifier provided by the load lifting module HC-108 is subtracted from the target load TL of the gasifier set by the gasifier load setting controller HC-107, and combined with the oxygen-coal ratio abnormal signal 003C given by the oxygen-coal ratio setting unit 3, the gasifier operating status signal 001A is obtained. The gasifier operating status signal 001A is divided into two categories: the first category indicates that the gasifier is in normal operating mode or load reduction mode, and the second category indicates that the gasifier is in load increase mode or oxygen-coal ratio abnormal. In the automatic selection setpoint unit 2, the oxygen-to-coal ratio setpoint SR and the coal slurry flow rate measurement value DF are used. C Multiply by this to obtain the oxygen flow control calculation value CF. O Further, the oxygen signal selection module FY8-110 selects the current oxygen demand IF of the gasifier under its current load. O Or the oxygen flow control calculation value CF O Make a selection and set the IF O or CF O As the oxygen flow control setpoint SF O ; The control function of the oxygen signal selection module FY8-110 is as follows: when the gasifier is in normal operation mode or load reduction mode, the output result is the current load oxygen demand of the gasifier (IF). O Signal 001B; When the gasifier is in load increase mode or the oxygen-to-coal ratio is abnormal, the output result is the calculated oxygen flow control value CF. O .

2. The control system according to claim 1, characterized in that, In the oxygen flow control unit 4, the oxygen flow rate of the coal-water slurry gasification process is measured by the oxygen flow transmitter FT-109, and used for the oxygen flow rate measurement value DF. O Signal 004A / B.

3. The control system according to claim 2, characterized in that, From oxygen flow rate measurement DF O and the oxygen flow control setpoint SF O Cascade control of oxygen flow controller FC-109; and / or oxygen flow measurement value DF O When an abnormal oxygen-to-coal ratio signal occurs, the oxygen flow rate is controlled by the oxygen flow rate control signal output by the oxygen flow rate controller FC-110; when no abnormal oxygen-to-coal ratio signal occurs, the oxygen flow rate is controlled by the oxygen flow rate control signal output by the oxygen flow rate controller FC-109.

4. The control system according to claim 1, characterized in that, The oxygen demand IF of the gasifier under current load is selected by the coal slurry signal selection module FY8-103. O Or oxygen flow rate measurement DF O By making a selection, the required calculated value CF for the coal slurry flow rate is obtained. C Further calculations based on the required coal slurry flow rate CF C Divide by the oxygen-to-coal ratio setpoint SR to obtain the coal slurry flow control setpoint SF. C .

5. The control system according to claim 4, characterized in that, The IF O or DF O The selection is made by the coal slurry signal selection module FY8-103 based on the gasifier operating status signal 001A.

6. The control system according to claim 1, characterized in that, The selection of AR or PR is determined by whether the oxygen flow controller FC-109, the oxygen flow fast controller FC-110, or the coal slurry flow controller FC-103 of the oxygen flow control unit 4 are not in cascade operation mode.

7. The control system according to claim 1, characterized in that, Three oxygen flow transmitters FT-109A~C are set up, and the measurement signal is taken as the middle value of the three.

8. The control system according to claim 1, characterized in that, The measurement signal from the oxygen flow transmitter FT-109 is subjected to temperature and pressure compensation, and the temperature and pressure compensated signal is used as the oxygen flow measurement value DF. O Signal 004A / B.

9. The control system according to claim 1, characterized in that, In the coal slurry flow control unit 5, the coal slurry flow rate of the coal-water slurry gasification process is measured by the coal slurry flow meter FT-103, and used for the coal slurry flow rate measurement value DF. C Signal 005A / B.

10. The control system according to claim 1, characterized in that, Three coal slurry flow meters FT-103A~C are installed, and the mean value of their measurement signals is taken as the measured value of the coal slurry flow DF. C Signal 005A / B.

11. The control system according to claim 9, characterized in that, DF (from coal slurry flow measurement value) C and the coal slurry flow control setpoint SF C The FC-103 cascade control coal slurry flow controller is used to control the coal slurry flow rate.

12. The control system according to claim 11, characterized in that, When an abnormal oxygen-to-coal ratio signal occurs, the operating mode of the coal slurry flow controller FC-103 will be forcibly set to manual operation mode.

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