Coal gasification system, coal water slurry monitoring assembly and coal water slurry production system

Abstract

The utility model relates to the technical field of coal gasification, and discloses a coal gasification system, a coal water slurry monitoring assembly and a coal water slurry production system.The coal gasification system comprises a coal mill, a coal feeding device, a limestone feeding device, an additive feeding device, a water feeding device, a gasification furnace and the coal water slurry monitoring assembly, the coal feeding device, the limestone feeding device, the additive feeding device and the water feeding device are respectively used for conveying corresponding materials to the coal mill, the coal mill is used for preparing coal water slurry and conveying the coal water slurry to the gasification furnace, and the coal water slurry monitoring assembly is used for detecting coal flow, limestone flow, additive flow, water flow and coal water slurry temperature. Therefore, basic data can be provided for calculating the real-time viscosity of the coal water slurry, and the accuracy of detecting the viscosity of the coal water slurry can be improved.

Description

[0001] Cross-references to related applications

[0002] This utility model claims the benefit of Chinese Patent Application No. 202421992939.6, filed on August 16, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of coal gasification technology, specifically relating to coal gasification systems, coal-water slurry monitoring assemblies, and coal-water slurry production systems. Background Technology

[0004] In coal-water slurry gasification technology, the viscosity of the coal-water slurry is a crucial indicator reflecting its flow properties. It is influenced by various factors, such as the type of coal, slurry concentration, the selection of additives, and slurry temperature. Currently, industrial viscometers used in the industry generally suffer from high costs, demanding operation and maintenance requirements, and susceptibility to external interference. Furthermore, coal-water slurry is highly abrasive, easily damaging the primary measuring element of the industrial viscometer. Therefore, the practical application of industrial viscometers is limited. Consequently, most producers employ manual sampling and offline analysis of slurry viscosity. However, this method suffers from time lag, and the high temperature within the coal-water slurry pipeline makes temperature control during offline analysis difficult, inevitably leading to significant deviations and lower accuracy in viscosity data. Summary of the Invention

[0005] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a coal gasification system, a coal-water slurry monitoring assembly, and a coal-water slurry production system, which can detect the flow rate of various ingredients and the discharge temperature of coal-water slurry in real time, providing basic data for calculating the real-time viscosity of coal-water slurry and improving the accuracy of viscosity detection.

[0006] To achieve the above objectives, this application provides a coal gasification system, comprising:

[0007] The coal mill includes a first feed inlet, a second feed inlet, a third feed inlet, a fourth feed inlet, and a first discharge outlet;

[0008] The coal feeding device includes a coal discharge end connected to the first feed inlet;

[0009] A limestone feeding device includes a limestone discharge end that is connected to the second feed inlet;

[0010] An additive feeding device includes an additive outlet connected to the third inlet via a feeding pipeline;

[0011] A water supply device, including a water supply outlet connected to the fourth feed inlet via a water supply pipeline;

[0012] The gasifier includes a coal-water slurry inlet connected to the first outlet via a coal-water slurry pipeline; and

[0013] The coal-water slurry monitoring assembly includes a coal flow detection device, a limestone flow detection device, an additive flow detection device, a water flow detection device, and a temperature detection device. The coal flow detection device is used to detect the coal flow rate of the coal feeding device, the limestone flow detection device is used to detect the limestone flow rate of the limestone feeding device, the additive flow detection device is used to detect the additive flow rate of the additive feeding device, the water flow detection device is used to detect the water flow rate of the water feeding device, and the temperature detection device is used to detect the temperature of the coal-water slurry in the coal-water slurry pipeline.

[0014] In some embodiments, the coal flow detection device includes a first weighing device, a first speed sensor, and a first processor disposed in the coal feeding device. The first weighing device is used to detect the weight of coal on the coal conveying mechanism of the coal feeding device, the first speed sensor is used to detect the coal conveying speed of the coal conveying mechanism, and the first processor communicates with the first weighing device and the first speed sensor.

[0015] In some embodiments, the limestone flow detection device includes a second weighing device, a second speed sensor, and a second processor disposed in the limestone feeding device. The second weighing device is used to detect the weight of limestone on the limestone conveying mechanism of the limestone feeding device, the speed sensor is used to detect the limestone conveying speed of the limestone conveying mechanism, and the second processor communicates with the second weighing device and the second speed sensor.

[0016] In some embodiments, the additive flow detection device is an additive flow meter installed in the feed line.

[0017] In some embodiments, the water flow detection device is a water flow meter installed in the water supply pipeline.

[0018] In some embodiments, the temperature detection device is a thermometer installed in the coal-water slurry pipeline near the furnace head of the gasifier.

[0019] In some embodiments, the coal gasification system includes an information processing device that communicates with the coal flow detection device, the limestone flow detection device, the additive flow detection device, the water flow detection device, and the temperature detection device, respectively.

[0020] A second aspect of this application provides a coal-water slurry monitoring assembly, comprising:

[0021] A coal flow detection device is used to detect the coal flow rate of a coal feeding device;

[0022] A limestone flow detection device is used to detect the limestone flow rate of a limestone feeding device.

[0023] An additive flow detection device is used to detect the additive flow rate of an additive feeding device.

[0024] A water flow detection device is used to detect the water flow rate of a water supply system.

[0025] A temperature detection device is used to detect the temperature of the coal-water slurry in the coal-water slurry pipeline between the coal mill and the gasifier.

[0026] In some embodiments, the coal-water slurry monitoring assembly includes an information processing device that communicates with the coal flow detection device, the limestone flow detection device, the additive flow detection device, the water flow detection device, and the temperature detection device, respectively.

[0027] A third aspect of this application provides a coal-water slurry production system, including a coal mill, a coal feeding device, a limestone feeding device, an additive feeding device, a water feeding device, and the aforementioned coal-water slurry monitoring assembly.

[0028] Through the above technical solution, the coal gasification system of this application can measure the coal flow rate, limestone flow rate, additive flow rate, and water flow rate in real time when feeding the coal mill using coal flow detection devices, limestone flow detection devices, additive flow detection devices, and water flow detection devices, respectively. Based on the above flow data, the concentration of the coal-water slurry discharged from the coal mill can be calculated. At the same time, the temperature of the coal-water slurry in the coal-water slurry pipeline can be measured using a temperature detection device. Based on the real-time concentration and temperature of the coal-water slurry, the viscosity of the coal-water slurry can be calculated indirectly without the use of a viscometer. Furthermore, it achieves online monitoring throughout the process, which is beneficial to improving the accuracy of obtaining viscosity data.

[0029] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0031] Figure 1 This is a schematic diagram of a coal gasification system according to a specific embodiment of this application.

[0032] Explanation of reference numerals in the attached figures

[0033] Detailed Implementation

[0034] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0035] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0036] like Figure 1 As shown, the first exemplary embodiment of this application provides a coal gasification system, which includes a coal mill 1, a coal feeding device 2, a limestone feeding device 3, an additive feeding device 4, a water feeding device 5, a gasifier 6, and a coal-water slurry monitoring assembly. The coal mill 1 includes a first feed inlet, a second feed inlet, a third feed inlet, a fourth feed inlet, and a first discharge outlet. The coal feeding device 2 includes a coal discharge end connected to the first feed inlet, through which coal can be fed to the coal mill 1. The limestone feeding device 3 includes a limestone discharge end connected to the second feed inlet, through which limestone can be fed to the coal mill 1. The additive feeding device 4 includes an additive discharge outlet connected to the third feed inlet via a feeding pipeline, thereby enabling the feeding of additives (such as dispersants, stabilizers, defoamers, etc.) to the coal mill 1. The water feeding device 5 includes a water outlet connected to the fourth feed inlet via a water supply pipeline, thereby enabling the feeding of slurry water to the coal mill 1. The gasifier 6 includes a coal-water slurry inlet connected to the first discharge outlet via a coal-water slurry pipeline, enabling the coal mill 1 to feed the prepared coal-water slurry to the gasifier 6. Understandably, when appropriate amounts of coal, limestone, additives, and water are mixed in the coal mill 1, a coal-water slurry can be produced for the preparation of coal gas.

[0037] The coal-water slurry monitoring assembly includes a coal flow detection device, a limestone flow detection device, an additive flow detection device 7, a water flow detection device 8, and a temperature detection device 9. Specifically, the coal flow detection device detects the coal flow rate of the coal feeding device 2, the limestone flow detection device detects the limestone flow rate of the limestone feeding device 3, the additive flow detection device 7 detects the additive flow rate of the additive feeding device 4, the water flow detection device 8 detects the water flow rate of the water feeding device 5, and the temperature detection device 9 detects the temperature of the coal-water slurry in the coal-water slurry pipeline.

[0038] Therefore, in the process of preparing coal gas from coal-water slurry, the coal gasification system of this exemplary embodiment can measure the flow rates of coal, limestone, additives, and water in real time using the coal flow detection device, limestone flow detection device, additive flow detection device 7, and water flow detection device 8. Based on these flow rate data, the concentration of the coal-water slurry output from the coal mill 1 can be calculated. Simultaneously, the temperature of the coal-water slurry in the pipeline is measured using the temperature detection device 9. Based on the real-time concentration and temperature of the coal-water slurry, the viscosity can be calculated. The viscosity can be indirectly measured without using a viscometer, and online monitoring is achieved throughout the process, which improves the accuracy of viscosity data acquisition and increases detection efficiency. Furthermore, the viscosity of the coal-water slurry at 20°C can be calculated based on its real-time concentration, thereby reducing the workload of manual analysis.

[0039] In an optional or preferred embodiment, the coal flow detection device includes a first weighing device, a first speed sensor, and a first processor (not shown in the figures) disposed in the coal feeding device 2. The first weighing device is used to detect the weight of the coal on the coal conveying mechanism of the coal feeding device 2, the first speed sensor is used to detect the coal conveying speed of the coal conveying mechanism, and the first processor communicates with the first weighing device and the first speed sensor.

[0040] Specifically, the first weighing device can be installed on a conveyor structure, such as a belt conveyor. When the coal passes through the coal feeding device 2, the first weighing device will detect the weight of the coal on the coal conveying mechanism and generate a voltage signal proportional to the load of the mechanism. At the same time, the speed sensor can be installed on the transmission structure such as rollers or drums of the coal conveying mechanism. The moving speed of the conveyor structure, such as the belt conveyor, is determined by measuring the transmission structure and pulse frequency of the coal conveying mechanism. After the first processor receives the weight signal and speed signal from the first weighing device and the first speed sensor, it performs integration calculations to determine the real-time flow rate of the coal.

[0041] In an optional or preferred embodiment, the limestone flow detection device includes a second weighing device, a second speed sensor, and a second processor (not shown in the figures) disposed in the limestone feeding device 3. The second weighing device is used to detect the weight of limestone on the limestone conveying mechanism of the limestone feeding device 3, the speed sensor is used to detect the limestone conveying speed of the limestone conveying mechanism, and the second processor communicates with the second weighing device and the second speed sensor. Similarly, the limestone flow detection device of this embodiment can obtain the real-time flow rate of limestone by calculating the coal flow rate as described above, which will not be repeated here.

[0042] In an optional or preferred embodiment, the additive flow detection device 7 is an additive flow meter installed in the feed pipeline, such as a worm gear flow meter, mass flow meter, electromagnetic flow meter, etc., which is not limited in this application. In this embodiment, the additive flow meter is installed between the additive outlet of the additive feeding device 4 and the third feed inlet of the coal mill 1, so as to accurately measure the flow rate of the additive delivered by the additive feeding device 4 to the coal mill 1, so as to calculate the concentration of the coal-water slurry.

[0043] In an optional or preferred embodiment, the water flow detection device 8 is a water flow meter installed in the water supply pipeline, such as a worm gear flow meter, mass flow meter, electromagnetic flow meter, etc., which is not limited in this application. In this embodiment, the additive flow meter is installed between the water supply outlet of the water supply device 5 and the fourth feed inlet of the coal mill 1, so as to accurately measure the flow rate of the slurry water supplied by the water supply device 5 to the coal mill 1, so as to calculate the concentration of the coal-water slurry.

[0044] In an optional or preferred embodiment, the temperature detection device 9 is a thermometer installed in the coal-water slurry pipeline near the furnace head section of the gasifier 6. Figure 1 As shown, since the coal-water slurry is generally pressurized by the high-pressure pump 10 before entering the gasifier 6, by setting the temperature detection device 9 close to the burner 601 of the gasifier 6, the real-time temperature of the coal-water slurry before entering the burner 601 can be accurately detected. This temperature is closer to the actual temperature of the coal-water slurry before the reaction, thereby reducing the error in calculating the viscosity of the coal-water slurry.

[0045] In an optional or preferred embodiment, the coal gasification system includes an information processing device (not shown in the figures), which communicates with a coal flow detection device, a limestone flow detection device, an additive flow detection device 7, a water flow detection device 8, and a temperature detection device 9, respectively. Specifically, the information processing device can be configured to calculate the concentration of the coal-water slurry prepared by the coal mill 1 based on the coal flow rate, limestone flow rate, additive flow rate, and water flow rate, and then calculate the real-time viscosity of the coal-water slurry based on the concentration and temperature of the coal-water slurry.

[0046] The formula for calculating the concentration of coal-water slurry is as follows:

[0047] C=Y+(Q1*(1-C M )+Q2*(1-C S )+Q3*(1-C T )+Q4*(1-C W )) / ( Q1+Q2+Q3+Q4);

[0048] Where C is the concentration of coal-water slurry (%) when all caprolactam waste liquid is used for slurry preparation, Y is the correction value (corrected based on artificial coal-water slurry concentration analysis data, generally 1.3%), Q1 is the coal flow rate (t / h), and C M Q1 represents the total water content in the coal (generally 0.10-0.16%), Q2 represents the limestone flow rate (t / h), and C represents the total water content in the coal. S Q1 represents the total water content of limestone (generally 0.001-0.004%), Q2 represents the additive flow rate (t / h), and C represents the total water content of limestone. T Q4 represents the total water content of the additive (generally 0.56-0.62%), Q4 represents the pulping water flow rate (t / h, including the flow rate of benzene extraction residue), and C represents the total water content of the additive. W The water content in the waste liquid when using caprolactam waste liquid for pulping is generally 0.90-0.96%.

[0049] It should be noted that when n coal feeding devices 2 are used for feeding, Q1 needs to be multiplied by n in the above formula.

[0050] The formula for calculating the viscosity of coal-water slurry is as follows:

[0051] η=0.3266 * e [85.9375 / (41.5053-C)] * e (18.0211 / T+11.2434) ;

[0052] Where η is the viscosity of the coal-water slurry (cP), e is the natural constant, C is the concentration of the coal-water slurry (%), and T is the temperature of the coal-water slurry (°C).

[0053] It should be noted that before programming the information processing equipment, the viscosity values ​​of different concentrations of coal-water slurry prepared from a certain type of coal can be measured at different temperatures. The experimental data can then be fitted using the mathematical software MATLAB to obtain the function curve of the viscosity of the coal-water slurry with its temperature and concentration. Finally, the calculation formula for the viscosity of the coal-water slurry mentioned above can be obtained, that is, the functional relationship between the viscosity of the coal-water slurry and its concentration and temperature.

[0054] The above concentration and viscosity formulas can be configured in the DCS (Distributed Control System) of the information processing equipment, enabling the coal gasification system of this exemplary embodiment to realize online detection of the viscosity of coal-water slurry.

[0055] A second exemplary embodiment of this application provides a coal-water slurry monitoring assembly, which includes a coal flow detection device, a limestone flow detection device, an additive flow detection device 7, a water flow detection device 8, and a temperature detection device 9. The coal flow detection device is used to detect the coal flow rate of the coal feeding device 2, the limestone flow detection device is used to detect the limestone flow rate of the limestone feeding device 3, the additive flow detection device 7 is used to detect the additive flow rate of the additive feeding device 4, the water flow detection device 8 is used to detect the water flow rate of the water feeding device 5, and the temperature detection device 9 is used to detect the temperature of the coal-water slurry in the coal-water slurry pipeline between the coal mill 1 and the gasifier 6.

[0056] Furthermore, the coal-water slurry monitoring assembly includes an information processing device, which communicates with the coal flow detection device, limestone flow detection device, additive flow detection device 7, water flow detection device 8, and temperature detection device 9, respectively, to obtain data information such as coal flow rate, limestone flow rate, additive flow rate, water flow rate, and coal-water slurry temperature, so as to calculate the real-time viscosity of the coal-water slurry. Clearly, the coal-water slurry monitoring assembly of this exemplary embodiment possesses the technical effects brought about by the aforementioned coal gasification system, and therefore will not be elaborated further here.

[0057] The third exemplary embodiment of this application provides a coal-water slurry production system, which includes a coal mill 1, a coal feeding device 2, a limestone feeding device 3, an additive feeding device 4, a water feeding device 5, and the aforementioned coal-water slurry monitoring assembly. Obviously, the coal-water slurry production system of this exemplary embodiment has the technical effects brought about by the aforementioned coal-water slurry monitoring assembly, so it will not be described in detail here.

[0058] In summary, the coal-water slurry monitoring assembly of this application can be used as a virtual viscometer or as a standalone virtual concentration meter. It should be further noted that when used as a virtual concentration meter, data from the coal flow detection device, limestone flow detection device, additive flow detection device 7, and water flow detection device 8 are collected via an information processing device. The total water content of the coal, the total water content of the limestone, the water-solid content of the slurry, and the additive solid content can be manually input into the information processing device. All data can be substituted into the aforementioned formula for calculating the coal-water slurry concentration to calculate the concentration, which can then be displayed on the information processing device's screen. Compared to the manual sampling and offline analysis of coal slurry concentration currently used in domestic and international coal-water slurry gasification plants, the coal-water slurry monitoring assembly of this application can detect the coal-water slurry concentration of the coal-water slurry gasification plant in real time, thereby providing timely guidance for the operation of the gasification plant, saving sampling procedures, and improving production efficiency.

[0059] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A coal gasification system, characterized in that, include: The coal mill (1) includes a first feed inlet, a second feed inlet, a third feed inlet, a fourth feed inlet, and a first discharge outlet; The coal feeding device (2) includes a coal discharge end connected to the first feed inlet; The limestone feeding device (3) includes a limestone discharge end connected to the second feed port; The additive feeding device (4) includes an additive outlet connected to the third inlet via a feeding pipeline; The water supply device (5) includes a water supply outlet connected to the fourth feed inlet via a water supply pipeline; Gasifier (6) includes a coal-water slurry inlet connected to the first outlet via a coal-water slurry pipeline; and The coal-water slurry monitoring assembly includes a coal flow detection device, a limestone flow detection device, an additive flow detection device (7), a water flow detection device (8), and a temperature detection device (9). The coal flow detection device is used to detect the coal flow of the coal feeding device (2), the limestone flow detection device is used to detect the limestone flow of the limestone feeding device (3), the additive flow detection device (7) is used to detect the additive flow of the additive feeding device (4), the water flow detection device (8) is used to detect the water flow of the water feeding device (5), and the temperature detection device (9) is used to detect the temperature of the coal-water slurry in the coal-water slurry pipeline.

2. The coal gasification system according to claim 1, characterized in that, The coal flow detection device includes a first weighing device, a first speed sensor and a first processor installed in the coal feeding device (2). The first weighing device is used to detect the weight of coal on the coal conveying mechanism of the coal feeding device (2). The first speed sensor is used to detect the coal conveying speed of the coal conveying mechanism. The first processor communicates with the first weighing device and the first speed sensor.

3. The coal gasification system according to claim 1, characterized in that, The limestone flow detection device includes a second weighing device, a second speed sensor, and a second processor installed in the limestone feeding device (3). The second weighing device is used to detect the weight of limestone on the limestone conveying mechanism of the limestone feeding device (3). The speed sensor is used to detect the limestone conveying speed of the limestone conveying mechanism. The second processor communicates with the second weighing device and the second speed sensor.

4. The coal gasification system according to claim 1, characterized in that, The additive flow detection device (7) is an additive flow meter installed in the feed pipeline.

5. The coal gasification system according to claim 1, characterized in that, The water flow detection device (8) is a water flow meter installed in the water supply pipeline.

6. The coal gasification system according to claim 1, characterized in that, The temperature detection device (9) is a thermometer installed in the coal-water slurry pipeline near the furnace head of the gasifier (6).

7. The coal gasification system according to any one of claims 1 to 6, characterized in that, The coal gasification system includes an information processing device, which communicates with the coal flow detection device, the limestone flow detection device, the additive flow detection device (7), the water flow detection device (8), and the temperature detection device (9), respectively.

8. A coal-water slurry monitoring assembly, characterized in that, include: A coal flow detection device is used to detect the coal flow rate of the coal feeding device (2); A limestone flow detection device is used to detect the limestone flow rate of the limestone feeding device (3); Additive flow detection device (7) is used to detect the additive flow rate of additive feeding device (4); A water flow detection device (8) is used to detect the water flow of the water supply device (5); Temperature detection device (9) is used to detect the temperature of coal-water slurry in the coal-water slurry pipeline between the coal mill (1) and the gasifier (6).

9. The coal-water slurry monitoring assembly according to claim 8, characterized in that, The coal-water slurry monitoring assembly includes an information processing device, which communicates with the coal flow detection device, the limestone flow detection device, the additive flow detection device (7), the water flow detection device (8), and the temperature detection device (9).

10. A coal-water slurry production system, characterized in that, It includes a coal mill (1), a coal feeding device (2), a limestone feeding device (3), an additive feeding device (4), a water feeding device (5), and a coal-water slurry monitoring assembly according to claim 8 or 9.

Images