Automatic coal blending system and method for coal water slurry gasification

Abstract

The invention provides an automatic coal blending system and method for coal water slurry gasification, and belongs to the technical field of coal water slurry gasification. The method comprises the steps that the number of weighing and metering systems is set according to the number of coal types, the weights of the corresponding coal types are independently weighed through the weighing and metering systems, the weighed coal types are sent into a slurrying system to be mixed with grinding water and an additive, and the slurrying system is used for slurrying the coal; preparing coal water slurry; the coal water slurry enters a gasification washing system to be gasified, and crude synthesis gas and ash residues are generated; the operation parameters of the gasification washing system are influenced by the coal type proportion, the operation parameters in the gasification washing system are received and analyzed through the coal type proportion system, feedback adjustment is conducted on the weighing metering system according to the operation parameters, the weighing of different coal types is adjusted, then the coal type proportion is changed, and the gasification condition of the coal water slurry is improved. According to the coal-water-slurry gasification system, coal is automatically and dynamically blended in the coal-water-slurry gasification production process, so that the gasification washing system can stably run for a long period by timely adjusting the coal blending proportion.

Description

Technical Field

[0001] This application belongs to the field of coal-water slurry gasification technology, specifically relating to an automatic coal blending system and method for coal-water slurry gasification. Background Technology

[0002] Coal-water slurry gasification technology involves mixing coal, water, and additives, then feeding the mixture into a coal mill to produce a coal-water slurry of a specific concentration. During the gasification process, most of the ash in the coal is converted into a liquid state and flows out of the gasifier under high temperature and pressure. The operating temperature of the gasifier is often more than 50°C higher than the ash melting temperature, and its operational stability is greatly affected by the coal quality. The properties of the ash are particularly important for coal blending and for ensuring a stable gasification reaction. However, in actual production, even coal from the same mine can have significant differences in quality. These variations in coal quality can affect the stability of the gasifier's operation, necessitating periodic shutdowns and impacting production efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, a first aspect of the present invention provides an automatic coal blending system for coal-water slurry gasification.

[0005] A second aspect of the present invention provides an automatic coal blending method for coal-water slurry gasification.

[0006] In view of this, a first aspect of the embodiments of this application provides an automatic coal blending system for coal-water slurry gasification, comprising:

[0007] The weighing and metering system is used to weigh coal types, and the number of weighing and metering systems is consistent with the number of coal types.

[0008] The slurry preparation system has an input channel connected to the output channel of the weighing and metering system. The slurry preparation system is used to mix coal types and produces coal-water slurry from the mixed coal types.

[0009] The gasification and scrubbing system has its input channel connected to the output channel of the slurry preparation system. The gasification and scrubbing system is used to gasify coal-water slurry.

[0010] A coal blending system is connected to a gasification and washing system, and the coal blending system receives operating parameters from the gasification and washing system.

[0011] The coal type proportioning system is connected to the weighing and metering system, and the coal type proportioning system controls the weighing capacity of the weighing and metering system.

[0012] There are at least two types of coal, and at least two weighing and metering systems are set up, with each weighing and metering system corresponding to a specific type of coal.

[0013] In one feasible implementation, the automatic coal blending system for coal-water slurry gasification further includes:

[0014] An online coal quality analyzer is connected to a weighing and metering system and is used to analyze the quality of different types of coal.

[0015] The online coal quality analyzer is connected to the coal type matching system, and the online coal quality analyzer feeds back the coal quality information of the coal type to the coal type matching system;

[0016] Among them, at least two online coal quality analyzers are set up, and the number of online coal quality analyzers is consistent with the number of weighing and metering systems. There is a one-to-one correspondence between online coal quality analyzers and weighing and metering systems.

[0017] In one feasible implementation, the automatic coal blending system for coal-water slurry gasification further includes:

[0018] The coal slurry feeding system has its input channel connected to the output channel of the slurry preparation system, and its output channel connected to the input channel of the coal type proportioning system.

[0019] A coal slurry concentration analyzer is installed on the input channel of the slurry preparation system. The coal slurry concentration analyzer is used to analyze the concentration of coal-water slurry.

[0020] According to a second aspect of the embodiments of this application, an automatic coal blending method for coal-water slurry gasification is proposed, which is applied to an automatic coal blending system for coal-water slurry gasification as described in any of the above technical solutions, including:

[0021] Weigh the different types of coal separately;

[0022] Mixed coal types are then processed into coal-water slurry.

[0023] Gasification of coal-water slurry is carried out using a gasification scrubbing system;

[0024] Collect operating parameters of the gasification scrubbing system;

[0025] Adjust the weighing weight of each type of coal according to the operating parameters.

[0026] In one feasible implementation, before preparing the mixed coal into a coal-water slurry, the following steps are included:

[0027] Industrial and ash analysis of coal types are conducted to collect coal quality information.

[0028] The ash content variation range of each coal type is analyzed based on coal quality information. When the actual value of the ash content variation range exceeds the analyzed value of the ash content variation range, the weighing weight of each coal type is adjusted.

[0029] After collecting the operation parameters of the gasification washing system, the method further comprises the steps of:

[0030] According to the analysis of the operation parameter variation range, when the actual value of the operation parameter variation range exceeds the analysis value of the operation parameter variation range, the weighing amount of each coal type is adjusted.

[0031] In an available embodiment, the proximate analysis comprises determining the total moisture, ash content, fixed carbon content of the coal type, and analyzing the low calorific value index;

[0032] The ash analysis comprises determining the silicon oxide, aluminum oxide, iron oxide, calcium oxide and magnesium oxide content of the coal type.

[0033] In an available embodiment, the coal types are mixed, and the mixed coal types are made into coal water slurry, comprising the steps of:

[0034] In the slurry preparation system, the grinding water, the additive and the mixed coal types are added;

[0035] After the grinding water, the additive and the coal types are mixed, the mixture is sent into the coal mill to prepare the coal water slurry;

[0036] The grinding water comprises at least one of biochemical sludge water, flash black water, ash water and organic sewage.

[0037] In an available embodiment, before the coal water slurry is gasified by the gasification washing system, the method further comprises the steps of:

[0038] The concentration of the coal water slurry is detected by a coal slurry concentration analyzer;

[0039] According to the concentration, the amount of the grinding water and the additive is adjusted to prepare qualified coal water slurry.

[0040] In an available embodiment, after the coal types are mixed and the mixed coal types are made into coal water slurry, the method further comprises the steps of:

[0041] The coal water slurry is pressurized, and the coal water slurry is sent into the gasification washing system;

[0042] The coal water slurry and the gasification agent are sprayed into the gasification furnace, the ash generated by the combustion of the gasification furnace is discharged into the lock hopper, the ash is treated by the slag extractor to form the slag;

[0043] The crude synthesis gas generated by the combustion of the gasification furnace is washed, and the crude synthesis gas is sent to the downstream device.

[0044] In an available embodiment, the operation parameters comprise:

[0045] At least one of a temperature change of the gasifier, a slag tap pressure difference change of the gasifier, a slag tap pressure difference change of the lock hopper, a temperature change of the lock hopper, a current intensity change of the slag conveyer, an effective gas component change in the crude synthetic gas, and a methane component change in the crude synthetic gas.

[0046] Compared with the prior art, the water coal slurry gasification automatic coal blending system and method provided by the application has the beneficial effects that:

[0047] The water coal slurry gasification automatic coal blending system provided by the embodiment of the application comprises a weighing and metering system, a slurry preparation system, a gasification and washing system, and a coal blending system. The number of the weighing and metering systems is set according to the number of the coal types to be mixed, so that the weight of the corresponding coal type is independently weighed by the weighing and metering system. The weighed coal type is sent into the slurry preparation system to be mixed with grinding water and additives to prepare water coal slurry. The water coal slurry is gasified in the gasification and washing system to produce crude synthetic gas and ash. The operating parameters of the gasification and washing system are affected by the coal blending. The operating parameters in the gasification and washing system are received and analyzed by the coal blending system, and then the weighing and metering system is feedback adjusted according to the change of the operating parameters to adjust the weight of the different coal types, so as to change the coal blending and improve the gasification of the water coal slurry, thereby realizing dynamic adjustment of the coal blending, automatically and dynamically blending the coal in the water coal slurry gasification production process, so that the gasification and washing system can be stably and long-periodically operated by timely adjusting the coal blending ratio. BRIEF DESCRIPTION OF DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0049] Figure 1 a schematic structural diagram of the water coal slurry gasification automatic coal blending system of an embodiment provided by the application;

[0050] Figure 2 a schematic step flow chart of the water coal slurry gasification automatic coal blending method of an embodiment provided by the application;

[0051] wherein, Figure 1 the correspondence between the reference signs in the drawings and the component names is as follows:

[0052] 1, weighing and metering system; 2, slurry preparation system; 3, gasification and washing system; 4, coal blending system; 5, online coal quality analyzer; 6, coal slurry feeding system; 7, coal slurry concentration analyzer;

[0053] 11 Coal type A; 12 Coal type B; 13 Grinding water; 14 Additive; 15 Crude synthesis gas; 16 Ash. DETAILED DESCRIPTION

[0054] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0055] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0058] As Figure 1As shown, according to the first aspect of the embodiment of the present application, an automatic coal blending system for coal water slurry gasification is provided, comprising: a weighing and metering system 1, a slurry preparation system 2, a gasification and washing system 3, and a coal blending system 4; the weighing and metering system 1 is used for weighing coal, and the number of the weighing and metering system 1 is consistent with the number of coal; the input channel of the slurry preparation system 2 is communicated with the output channel of the weighing and metering system 1, the slurry preparation system 2 is used for mixing coal, and the slurry preparation system 2 prepares coal water slurry after mixing; the input channel of the gasification and washing system 3 is communicated with the output channel of the slurry preparation system 2, the gasification and washing system 3 is used for gasification of coal water slurry; the coal blending system 4 is electrically connected with the gasification and washing system 3, and the coal blending system 4 receives operating parameters of the gasification and washing system 3; the coal blending system 4 is electrically connected with the weighing and metering system 1, and the coal blending system 4 controls the weight of the weighing and metering system 1; wherein, there are at least two kinds of coal, and at least two weighing and metering systems 1 are provided, and the weighing and metering system 1 corresponds to one kind of coal.

[0059] The automatic coal blending system for coal water slurry gasification provided by the embodiment of the present application comprises the weighing and metering system 1, the slurry preparation system 2, the gasification and washing system 3, and the coal blending system 4, the number of the weighing and metering system 1 is set according to the number of the coal to be mixed, so as to independently weigh the weight of the corresponding coal through the weighing and metering system 1, and the weighed coal is sent into the slurry preparation system 2 to be mixed with grinding water 13 and additives 14 to prepare coal water slurry; the coal water slurry enters the gasification and washing system 3 to be gasified to produce crude synthesis gas 15 and ash residue 16; the operating parameters of the gasification and washing system 3 are affected by the coal blending, the operating parameters in the gasification and washing system 3 are received and analyzed through the coal blending system 4, and then the weighing and metering system 1 is feedback adjusted according to the change of the operating parameters, so as to adjust the weight of different coal, and further change the coal blending, improve the gasification of the coal water slurry, and further realize dynamic adjustment of the coal blending, so as to automatically and dynamically blend coal in the production process of the coal water slurry gasification, thereby enabling the gasification and washing system 3 to be smoothly and long-periodically operated through timely adjustment of the coal blending ratio.

[0060] In some examples, the coal includes coal A 11 and coal B 12, and when coal C needs to be additionally added, only one weighing and metering system 1 needs to be added to weigh the coal C, so as to realize rapid weighing and blending of three kinds of coal.

[0061] In a feasible implementation, the automatic coal blending system for coal water slurry gasification further comprises: an online coal quality analyzer 5, the online coal quality analyzer 5 is connected with the weighing and metering system 1, and the online coal quality analyzer 5 is used for analyzing the coal quality of the coal; the online coal quality analyzer 5 is electrically connected with the coal blending system 4, and the online coal quality analyzer 5 feeds back the coal quality information of the coal to the coal blending system 4; wherein, at least two online coal quality analyzers 5 are provided, the number of the online coal quality analyzers 5 is consistent with the number of the weighing and metering system 1, and the online coal quality analyzer 5 corresponds to one weighing and metering system 1.

[0062] In this technical solution, before the coal enters the pulping system 2, an online coal quality analyzer 5 is used to measure the coal type. The online coal quality analyzer 5 feeds back the analysis results to the coal blending system 4. Based on the coal quality analysis results, the coal blending system 4 adjusts the weighing weight of the coal and dynamically adjusts the mass ratio of the blended coal. By changing the blending ratio, the gasification and washing system 3 can operate stably for a long period of time, improving the continuity of system operation and helping to improve production efficiency. Each type of coal is equipped with a weighing and metering system 1 and an online coal quality analyzer 5 to achieve independent weighing and coal quality analysis of the coal type, ensuring the accuracy of dynamic coal blending.

[0063] As a preferred option, the coal quality analysis results are the preferred feedback path, as the feedback path is shorter and easier to adjust. The feedback of the operating parameter changes of the gasification washing system 3 is relatively lagging. When the changes in the acid-base ratio of the coal blend and the ash content of the coal exceed the corresponding change range analysis values, the coal weight is adjusted according to the changes in the acid-base ratio and ash content of the coal blend. However, if the changes in the acid-base ratio and ash content of the coal blend do not exceed the corresponding change range analysis values, but the changes in the operating parameters of the gasification washing system 3 exceed their change range analysis values, the coal weight is adjusted according to the changes in the operating parameters of the gasification washing system 3 to ensure the stable operation of the gasification washing system 3.

[0064] In one feasible implementation, the automatic coal blending system for coal-water slurry gasification further includes: a coal slurry feeding system 6 and a coal slurry concentration analyzer 7. The input channel of the coal slurry feeding system 6 is connected to the output channel of the slurry preparation system 2, and the output channel of the coal slurry feeding system 6 is connected to the input channel of the coal type proportioning system 4. The coal slurry concentration analyzer 7 is installed on the input channel of the slurry preparation system 2 and is used to analyze the concentration of the coal-water slurry.

[0065] In this technical solution, the coal slurry feeding system 6 is used to pressurize the coal-water slurry and send the pressurized coal-water slurry into the gasification and washing system 3. This helps the coal-water slurry to atomize in the gasification and washing system 3, enabling it to burn rapidly. A coal slurry concentration analyzer 7 is installed at the input channel of the slurry preparation system 2 to detect the concentration of the coal-water slurry. The dosage of grinding water 13 and additive 14 is adjusted according to the concentration of the coal-water slurry to ensure that the prepared coal-water slurry meets the concentration requirements for gasification.

[0066] like Figure 2 As shown, according to a second aspect of this application, an automatic coal blending method for coal-water slurry gasification is proposed, applicable to any of the above-described automatic coal-water slurry gasification blending systems, comprising:

[0067] Different coal types are weighed respectively, and different coal types are weighed independently, so as to quickly and directly control the mass ratio of coal blending;

[0068] The mixed coal types are made into coal water slurry;

[0069] The coal water slurry is gasified by using the gasification washing system 3, so that the coal water slurry is rapidly combusted in the gasification washing system 3 to generate ash and crude synthesis gas 15, and the crude synthesis gas 15 is sent to a downstream device;

[0070] The operating parameters of the gasification washing system 3 are collected to obtain main influencing factors of the coal quality on the gasification washing system 3;

[0071] The weighing amounts of the coal types are adjusted according to the operating parameters, and the weighing amounts of the coal types are reversely adjusted according to real-time changes of the influencing factors, so as to realize dynamic adjustment of the coal blending ratio of the coal water slurry.

[0072] The coal water slurry gasification automatic coal blending method provided by the embodiment of the application first weighs different coal types respectively, then mixes the coal types and makes the coal types into coal water slurry, collects changes of operating parameters of the gasification washing system 3 during gasification of the coal water slurry by the gasification washing system 3, then reversely adjusts the weighing amounts of the coal types according to the changes of the parameters of the gasification washing system 3, and further dynamically adjusts the blending ratio of the coal types according to real-time operating conditions of the gasification washing system 3, so as to automatically and dynamically blend coal during the coal water slurry gasification production process, thereby enabling the gasification washing system 3 to be stably and long-periodically operated by timely adjusting the coal blending ratio.

[0073] In a feasible implementation manner, before the step of mixing the coal types and making the mixed coal types into coal water slurry, the method further includes the following step:

[0074] Industrial analysis and ash analysis are performed on the coal types to collect coal quality information of the coal types;

[0075] The ash content variation range of the coal types is analyzed according to the coal quality information, and the weighing amounts of the coal types are adjusted when an actual value of the ash content variation range exceeds an analysis value of the ash content variation range;

[0076] After the step of collecting the operating parameters of the gasification washing system 3, the method further includes the following step:

[0077] The operating parameter variation range is analyzed according to the operating parameters, and the weighing amounts of the coal types are adjusted when an actual value of the operating parameter variation range exceeds an analysis value of the operating parameter variation range.

[0078] In the technical solution, the component of the coal quality is monitored in real time by the online coal quality analyzer 5, the coal quality is analyzed, the coal quality information of the coal type is obtained in real time, whether the weighing amount of each coal type needs to be adjusted is determined according to the variation range of the ash content of the coal type, the weighing amount of each coal type is adjusted when the actual value of the variation range of the ash content exceeds the analysis value of the variation range of the ash content, and the weighing amount of each coal type is not adjusted when the actual value of the variation range of the ash content does not exceed the analysis value of the variation range of the ash content. The running parameters of the gasification and washing system 3 are collected to obtain the real-time running parameters of the gasification and washing system 3, whether the weighing amount of each coal type needs to be adjusted is determined according to the variation range of the running parameters of the gasification and washing system 3, the weighing amount of each coal type is adjusted when the actual value of the variation range of the running parameters exceeds the analysis value of the variation range of the running parameters, and the weighing amount of each coal type is not adjusted when the actual value of the variation range of the running parameters does not exceed the analysis value of the variation range of the running parameters. Meanwhile, the coal type weighing amount is adjusted according to the analysis result of the variation of the running parameters of the gasification and washing system 3, so that the coal type weighing amount is more accurately and effectively adjusted, the reliability of the dynamic control of the coal blending ratio is improved, the variation range of the running parameters of the gasification and washing system 3 is quickly and effectively adjusted to the analysis value of the variation range, and the running of the gasification and washing system 3 can better respond to the change of the coal quality.

[0079] Further, the coal type is provided with different coal blending modes, when the variation range of the running parameters of the gasification and washing system 3 and the analysis result of the coal quality does not exceed the analysis value of the obtained variation range, the coal blending ratio of the coal type is not adjusted, and the gasification and washing system 3 can be stably and long-periodically run; when the variation range of the running parameters of the gasification and washing system 3 or the analysis result of the coal quality exceeds the analysis value of the obtained variation range, the coal blending ratio of the coal type is adjusted, the coal blending mode is changed, and the gasification and washing system 3 is stably and long-periodically run.

[0080] Specifically, the ash component of the coal type is detected in real time, the variation range of the ash component is analyzed in advance, the coal blending ratio is directly adjusted to the previous or next coal blending mode when the actual value of the variation range of the ash component of the coal type exceeds the analysis value of the variation range of the ash component, the ash-acid ratio of the coal type can be calculated from the ash component, the variation range of the ash-acid ratio is analyzed in advance, and the coal blending ratio is directly adjusted to the previous or next coal blending mode when the actual value of the variation range of the ash-acid ratio of the coal type exceeds the analysis value of the variation range of the ash-acid ratio.

[0081] In some examples, the coal types include a coal type A11 and a coal type B12, and the mass ratio of the coal type A11 and the coal type B12 is in a certain range, as shown in Table 1, common 11 coal blending modes are listed according to the mass ratio of the coal types (the coal blending modes are not limited to 11, and can be increased or decreased according to actual production requirements), the mass ratio of the coal type A11 and the coal type B12 is adjustable in the range of 1-9, or the coal type A11 or the coal type B12 can be all used. Further, according to the coal quality and the operation of the gasification and washing system 3, a default coal blending mode of the preset coal blending mass ratio is determined. Specifically, the default ratio of the coal blending mass ratio is the fourth coal blending mode, that is, the mass ratio of the coal type A11 and the coal type B12 is 7:3.

[0082] Table 1: Relationship between coal blending mode and coal blending mass ratio

[0083]

[0084] In a feasible implementation, the proximate analysis includes determining the total moisture, ash content, fixed carbon content of the coal type, and analyzing the low calorific value index.

[0085] The ash analysis includes determining the content of silicon oxide, aluminum oxide, iron oxide, calcium oxide and magnesium oxide of the coal type.

[0086] In the technical solution, the proximate analysis determines the content of the total moisture, ash content and fixed carbon of the coal type in real time, analyzes the low calorific value index, and analyzes the combustion performance of the coal type; the ash analysis determines the content of the silicon oxide, aluminum oxide, iron oxide, calcium oxide and magnesium oxide of the coal type in real time, analyzes the ash-acid ratio of the coal type, and calculates the coal blending to keep the temperature of the gasifier in a certain range during the gasification process of the coal water slurry after the coal blending.

[0087] As a preferred solution, when the ash-acid ratio of the coal is 0.5-5.0, the coal type is blended under the ash-acid ratio, so that the coal blending can meet the operation requirement that the temperature of the gasifier is 1200-1350℃.

[0088] Specifically, the calculation formula of the ash-acid ratio (S) after the coal blending is as follows:

[0089]

[0090] Wherein:

[0091] X: the mass ratio of the coal type A11 in the coal blending (for example, if the total amount of the coal blending is 100%, then X+Y=1);

[0092] Y: the mass ratio of the coal type B12 in the coal blending;

[0093] (SiO2) A ,(Al2O3) A ,(Fe2O3)A (CaO) A (MgO) A : mass percentage of each oxide in ash of coal type A11; (SiO2) B (Al2O3) B (Fe2O3) B (CaO) B (MgO) B : mass percentage of each oxide in ash of coal type B12 In a feasible implementation, the coal types are mixed, and the mixed coal types are made into coal water slurry, including the steps of:

[0094] The grinding water 13, the additive 14 and the mixed coal types are added into the coal grinding system 2;

[0095] The grinding water 13, the additive 14 and the mixed coal types are mixed and then sent into the coal mill to make the coal water slurry;

[0096] The grinding water 13 includes at least one of biochemical sludge water, flash black water, ash water and organic sewage.

[0097] In the technical solution, the grinding water 13, the additive 14 and the mixed coal types are added into the coal grinding system 2, and then sent into the coal mill to make the coal water slurry with a certain concentration. The grinding water 13 can be at least one of sludge water, flash black water, ash water and organic sewage, so that the industrial wastewater is reused and the production cost is reduced.

[0098] In a feasible implementation, before the coal water slurry is gasified by the gasification washing system 3, the following steps are further included:

[0099] The concentration of the coal water slurry is detected by the coal slurry concentration analyzer 7;

[0100] The use amounts of the grinding water 13 and the additive 14 are adjusted according to the concentration to make qualified coal water slurry.

[0101] In the technical solution, on the basis of dynamically adjusting the amount of mixed coal, the concentration of the coal water slurry made by the coal grinding system 2 after the coal is mixed is detected in real time by the coal slurry concentration analyzer 7 to determine whether the concentration of the coal water slurry meets the requirements, and the use amounts of the grinding water 13 and the additive 14 are dynamically adjusted according to the analysis result of the coal slurry concentration analyzer 7 to adjust the concentration of the coal water slurry, so that when the coal quality changes in real time, the concentration of the coal water slurry is always in a state meeting the gasification requirements.

[0102] In a feasible implementation, after the coal types are mixed and the mixed coal types are made into coal water slurry, the following steps are further included:

[0103] The coal water slurry is pressurized, and the coal water slurry is sent into the gasification washing system 3;

[0104] The water coal slurry and the gasification agent are sprayed into the gasification furnace, and the ash generated by the gasification furnace combustion is discharged into the lock hopper, and the ash is subjected to slagging treatment by the slagging machine to form the ash slag 16;

[0105] The crude synthesis gas 15 generated by the gasification furnace combustion is washed, and the crude synthesis gas 15 is sent to the downstream device.

[0106] In the technical scheme, the water coal slurry is pressurized and then mixed with the gasification agent to be sprayed into the gasification furnace, so that the water coal slurry is rapidly dispersed to make the water coal slurry rapidly burn in the gasification washing system 3, the crude synthesis gas 15 generated by the water coal slurry combustion is washed and then sent to the downstream device, and the ash generated by the combustion is in a molten state and is discharged into the lock hopper, and is changed into the ash slag 16 after passing through the slagging machine, so as to facilitate centralized collection and treatment.

[0107] As a preferred scheme, the water coal slurry is pressurized by the coal slurry pressurizing pump in the coal slurry feeding system 6 to increase the pressure to 7.0 MPa(G)~9.0 MPa(G), and the water coal gas is sent to the gasification washing system 3, and is sprayed into the gasification furnace together with the oxygen gas after being atomized by the nozzle, and is rapidly combusted to generate the crude coal gas mainly composed of carbon monoxide, hydrogen, and carbon dioxide, and a large amount of heat is generated in the gasification process, the temperature of the gasification furnace is maintained at about 1350°C, and the pressure is maintained at about 6.5 MPa(G), so that the gasification washing system 3 can stably operate.

[0108] In a feasible implementation manner, the operation parameters include:

[0109] At least one of the temperature change of the gasification furnace, the slagging port pressure difference change of the gasification furnace, the slagging port pressure difference change of the lock hopper, the temperature change of the lock hopper, the current intensity change of the slagging machine, the effective gas component change in the crude synthesis gas 15, and the methane component change in the crude synthesis gas 15.

[0110] In the technical scheme, the temperature change of the gasification furnace, the slagging port pressure difference change of the gasification furnace, the slagging port pressure difference change of the lock hopper, the temperature change of the lock hopper, the current intensity change of the slagging machine, the effective gas (hydrogen and carbon monoxide) component change in the crude synthesis gas 15, and the methane component change in the crude synthesis gas 15 are greatly affected by the coal quality, change rapidly and greatly, respond in time, and then accurately reflect the real-time operation of the gasification washing system 3, and then the quality proportion of the coal is dynamically adjusted to ensure the stable long-period operation of the gasification washing system 3.

[0111] Further, when the coal blending mode is changed, the change amplitude of the operation parameters of the gasification washing system 3 is preferentially considered, the change amplitude of the acid-base ratio of the coal blending is secondly considered, and the change amplitude of the ash content of the coal is lastly considered.

[0112] As a preferred solution, the change range of the acid-base ratio of the coal blending and the change range of the ash content of the coal are the priority selection of the feedback path, the path of feedback adjustment according to the coal quality analysis is shorter and easier to adjust; the feedback according to the change range of the operation parameters of the gasification and washing system 3 is more lagging; when the change range of the acid-base ratio of the coal blending and the change range of the ash content of the coal exceed the corresponding change range analysis value, the coal weighing is adjusted according to the change range of the acid-base ratio of the coal blending and the change range of the ash content of the coal; but if the change range of the acid-base ratio of the coal blending and the change range of the ash content of the coal are both more than the corresponding change range analysis value, and the change range of the operation parameters of the gasification and washing system 3 exceeds the change range analysis value, the coal weighing is adjusted according to the change range of the operation parameters of the gasification and washing system 3.

[0113] Further, the operation parameters with a large change range are selected, and the reference operation parameters can be one or more, when the change range of the operation parameters exceeds the corresponding change range analysis value, the last or next coal blending mode is automatically selected to meet the stable operation of the gasification and washing system 3.

[0114] Further, according to the coal quality analysis results and the operation parameters of the gasification and washing system 3, the change range of the parameters of each analysis item is set; during actual operation, when the change range of the analysis item exceeds the corresponding change range analysis value, the coal blending ratio is changed, that is, the coal blending mode is changed. As a preferred solution, the relationship between the analysis items and the analysis range is shown in Table 2.

[0115] Table 2 Relationship table of analysis items and analysis range

[0116]

[0117]

[0118] It can be understood that the water-coal slurry gasification automatic coal blending method provided by the embodiment of the application is applied to the water-coal slurry gasification automatic coal blending system of any of the above technical solutions, so the water-coal slurry gasification automatic coal blending method has all the beneficial effects of the water-coal slurry gasification automatic coal blending system of the above technical solutions.

[0119] Example 1:

[0120] The online coal quality analyzer is used to analyze the industrial analysis and ash content of coal A and coal B. The coal quality analysis results of coal A and coal B are shown in Table 3. Coal A and coal B of a certain mass are mixed by the coal blending and weighing system, and the mass ratio of coal A to coal B is 7:3 (the fourth coal blending mode). The mixed coal enters the slurry preparation system. In the slurry preparation system, grinding water and additives are added to the mixed coal A and coal B, and then the mixture enters the coal mill to prepare coal water slurry with a concentration of 63%. The coal water slurry is sent to the coal slurry feeding system. In the coal slurry feeding system, the pressure of the coal water slurry is increased to 7.5 MPa (G) by the coal slurry booster pump, and then the pressurized coal water slurry is mixed with oxygen at a pressure of 8.5 MPa (G) and atomized through the gasification process nozzle, and then sprayed into the gasification furnace. In the gasification furnace, the temperature is 1270℃, the pressure is 6.3 MPa (G), the flow rate of the quenching water is 700m 3 / h~950m 3 / h, the content of effective gas (hydrogen and carbon monoxide) in the washed crude synthesis gas is 81.0%, the temperature is 236℃, the pressure is 6.2 MPa (G), and the flow rate is 540300 Nm 3 / h, and the crude synthesis gas is sent to the downstream device. Before the slag is discharged, the temperature of the lock hopper is 65℃, the current of the slag conveyor is 29A, the liquid ash produced by the gasification reaction is changed into solid ash by water bath and discharged into the lock hopper, and then the slag is removed by the slag conveyor and transported out.

[0121] The change range analysis value of the lock hopper temperature is set to 25%, the change range analysis value of the slag conveyor current is set to 25%, and the change range of the gasifier temperature and the effective gas (hydrogen and carbon monoxide) component in the synthesis gas is not set. In actual production operation, after the slag is discharged, the temperature of the lock hopper rises from 65℃ to 85℃, and the actual change range is 30.7%, which exceeds 25%. The current of the slag conveyor rises from 28A to 34A, and the actual change range is 21.4%. Because the actual change range of the lock hopper temperature exceeds the pre-set change range analysis value, the coal blending ratio is adjusted, and the coal blending mode is changed to the second coal blending mode, i.e. the ratio of coal A to coal B is 8:2. The system continues to operate, the temperature of the lock hopper decreases from 85℃ to 75℃, and the current of the slag conveyor decreases from 34A to 32A. The actual change range of the lock hopper temperature and the slag conveyor current does not exceed the corresponding pre-set change range analysis value. After dynamically adjusting the coal blending ratio of the coal type, the stable operation of the gasification and washing system is realized.

[0122]

[0123]

[0124] Those skilled in the art can easily understand that the above-mentioned various embodiments can be freely combined and superimposed without conflict.

[0125] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is merely the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, and these improvements and variations shall be considered as the protection scope of the present application.

Claims

1. An automatic coal blending system for coal-water slurry gasification, characterized in that, The automatic coal blending system for coal-water slurry gasification includes: A weighing and metering system, wherein the weighing and metering system is used to weigh coal types, and the number of the weighing and metering systems is consistent with the number of coal types. A slurry preparation system, wherein the input channel of the slurry preparation system is connected to the output channel of the weighing and metering system, the slurry preparation system is used to mix coal types, and the slurry preparation system produces coal-water slurry from the mixed coal types; A gasification scrubbing system, wherein the input channel of the gasification scrubbing system is connected to the output channel of the slurry preparation system, and the gasification scrubbing system is used to gasify the coal-water slurry; A coal type proportioning system is provided, which is connected to the gasification and washing system, and receives operating parameters from the gasification and washing system. The coal type proportioning system is connected to the weighing and metering system, and the coal type proportioning system controls the weighing weight of the weighing and metering system. There are at least two types of coal, and at least two weighing and metering systems are provided, with each weighing and metering system corresponding to one of the coal types.

2. The automatic coal blending system for water-coal slurry gasification according to claim 1, characterized in that, The automatic coal blending system for coal-water slurry gasification also includes: An online coal quality analyzer is connected to the weighing and measuring system, and the online coal quality analyzer is used to analyze the coal quality of the coal type. The online coal quality analyzer is connected to the coal type proportioning system, and the online coal quality analyzer feeds back the coal quality information of the coal type to the coal type proportioning system; The system includes at least two online coal quality analyzers, the number of which is the same as the number of weighing and metering systems, and there is a one-to-one correspondence between the online coal quality analyzers and the weighing and metering systems.

3. The automatic coal blending system for coal-water slurry gasification according to claim 1, characterized in that, The automatic coal blending system for coal-water slurry gasification also includes: A coal slurry feeding system, wherein the input channel of the coal slurry feeding system is connected to the output channel of the slurry preparation system, and the output channel of the coal slurry feeding system is connected to the input channel of the coal type proportioning system; A coal slurry concentration analyzer is installed on the input channel of the slurry preparation system and is used to analyze the concentration of the coal-water slurry.

4. An automatic coal blending method for coal-water slurry gasification, characterized in that, The automatic coal blending system for water-coal slurry gasification as described in any one of claims 1 to 3 includes: Weigh the different types of coal separately; The coal types are mixed, and the mixed coal types are then used to make a coal-water slurry; The coal-water slurry is gasified using a gasification scrubbing system; Collect the operating parameters of the gasification scrubbing system; Adjust the weighing weight of each coal type according to the operating parameters.

5. The automatic coal blending method for coal-water slurry gasification according to claim 4, characterized in that, Before mixing the coal types and preparing the mixed coal types into a coal-water slurry, the following steps are also included: Industrial analysis and ash content analysis were performed on the coal type to collect coal quality information. Based on the coal quality information, the ash content variation range of the coal type is analyzed. When the actual value of the ash content variation range exceeds the analyzed value of the ash content variation range, the weighing weight of each coal type is adjusted. Following the collection of the operating parameters of the gasification scrubbing system, the method further includes the following steps: Based on the analysis of the operating parameters, the range of change of the operating parameters is determined. When the actual value of the range of change of the operating parameters exceeds the analyzed value of the range of change of the operating parameters, the weighing weight of each type of coal is adjusted.

6. The automatic coal blending method for coal-water slurry gasification according to claim 5, characterized in that, The industrial analysis includes determining the total water, ash, fixed carbon content, and analyzing the lower heating value of the coal. The ash analysis includes determining the content of silicon dioxide, aluminum oxide, iron oxide, calcium oxide, and magnesium oxide in the coal.

7. The automatic coal blending method for coal-water slurry gasification according to claim 4, characterized in that, The process of mixing the coal types and then preparing a coal-water slurry includes the following steps: In the pulping system, grinding water, additives, and the mixed coal are added; The grinding water, the additive, and the coal are mixed and fed into a coal mill to produce the coal-water slurry. The grinding water includes at least one of the following: biochemical sludge water, flash evaporation black water, ash water, and organic wastewater.

8. The automatic coal blending method for coal-water slurry gasification according to claim 7, characterized in that, The step further includes, prior to gasifying the coal-water slurry using a gasification scrubbing system: The concentration of the coal-water slurry was detected using a coal slurry concentration analyzer; Adjust the amounts of grinding water and additives according to the concentration to prepare qualified coal-water slurry.

9. The automatic coal blending method for coal-water slurry gasification according to claim 4, characterized in that, The process of mixing the coal types involves preparing a coal-water slurry from the mixed coal, followed by the step of: The coal-water slurry is pressurized and then fed into the gasification and washing system. The coal-water slurry and gasifying agent are injected into the gasifier, and the ash produced by combustion in the gasifier is discharged into the lock hopper. The ash is then removed by a slag remover to form ash slag. The crude syngas produced by combustion in the gasifier is washed and then sent to downstream devices.

10. The automatic coal blending method for coal-water slurry gasification according to claim 9, characterized in that, The operating parameters include: At least one of the following: temperature change of the gasifier, pressure difference change of the slag outlet of the gasifier, pressure difference change of the slag outlet of the lock hopper, temperature change of the lock hopper, current intensity change of the slag remover, change of effective gas components in the crude syngas, and change of methane components in the crude syngas.

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