Method and system for determining actual proportion of coal blended with kaolin

Abstract

The invention discloses a method and a system for determining the actual proportion of coal blended with kaolin. The method comprises the following steps: determining the type of a kaolin ore sample; arranging a slag-bonding probe at a fire detection hole in an easy-to-slag-bonding area of the boiler; determining the load and the test duration of the boiler; the maximum air supply amount of the boiler is determined; according to the load of the boiler, the test duration, the maximum air supply amount and the maximum feeding amount of the kaolin ore sample, the anti-slagging effect is tested through a slagging probe, then the feeding amount is gradually reduced until the minimum feeding amount capable of achieving the anti-smashing effect can be achieved, and the anti-smashing effect is achieved. And calculating the actual proportion of the coal blended with the kaolin according to the minimum feeding amount and the current feeding amount. According to the method and the system, the actual proportion of the coal blended with the kaolin can be determined.

Description

Technical Field

[0001] The invention belongs to the technical field of power generation of coal-fired power plants, and relates to a method and a system for determining the actual proportion of coal blended with kaolin. Background Art

[0002] Zhundong coal reserves in the Zhundong region of Xinjiang are nearly 400 billion tons, and it is an important coal-fired power and coal chemical base in my country in the future. Zhundong coal has good ignition and burnout properties and excellent environmental protection indicators, but boilers burning Zhundong coal have serious slagging and contamination problems, which limits the use of Zhundong coal in power station boilers. At present, boilers basically use Zhundong coal in the form of blending with low-sodium coal, but due to the huge reserves of Zhundong coal, there is not enough low-sodium coal in the surrounding areas for blending, and it has become an inevitable trend for boilers to burn all Zhundong coal.

[0003] For a large number of in-service units that burn Zhundong coal, the renovation space is limited, and only anti-slagging additives can be used. Zhundong and surrounding areas have large reserves of kaolin, so the use of kaolin as an anti-slagging additive for Zhundong coal has good industrial application prospects. However, most of the research on the proportion of Zhundong coal blended with kaolin is in the laboratory stage, which is quite different from the actual application environment in the boiler. Summary of the invention

[0004] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a method and system for determining the actual ratio of coal to kaolin. The method and system can determine the actual ratio of coal to kaolin.

[0005] To achieve the above object, the present invention discloses a method for determining the actual proportion of coal blended with kaolin, comprising:

[0006] Determine the type of kaolin ore sample;

[0007] Arrange slagging probes at the fire detection holes in the boiler's slagging prone areas;

[0008] Determine the boiler load and test duration;

[0009] Determine the maximum air flow rate of the boiler;

[0010] According to the load of the boiler, test duration and maximum air supply, the maximum feed amount of the kaolin ore sample is taken, and the anti-slagging effect is tested by a slag probe, and then the feed amount is gradually reduced until the minimum feed amount that can achieve the anti-smashing effect is reached. The actual ratio of coal blended with kaolin is calculated based on the minimum feed amount and the current feed amount.

[0011] The further improvement of the method for determining the actual proportion of coal blended with kaolin in the present invention is:

[0012] Furthermore, the process of arranging the slagging probe at the fire detection hole in the slagging-prone area of ​​the boiler is as follows:

[0013] The slagging-prone area of ​​the boiler is determined, and then a slagging probe is arranged at the fire detection hole in the slagging-prone area of ​​the boiler.

[0014] Furthermore, the boiler slagging prone areas are determined through numerical simulation and field observation.

[0015] Furthermore, the process of determining the boiler load and the test duration is as follows:

[0016] The slagging characteristic test of the slagging probe is carried out under different boiler loads to test the influence of boiler load and slagging duration on the slagging characteristic of the slagging probe and determine the boiler load and test duration.

[0017] Furthermore, the process of determining the maximum air supply volume of the boiler is as follows:

[0018] Insert the slagging probe into the furnace, adjust the amount of compressed air to make the wall temperature of the slagging probe the same as the wall temperature of the water-cooled wall in this area, adjust the conveying air volume of the slagging agent adding device, observe the effect of the conveying air flow on the slagging on the slagging probe, take out the slagging probe after continuously supplying air for a predetermined time, and when the conveying air affects the slagging, reduce the conveying air volume until the conveying air has no effect on the slagging, and determine the air supply volume at this time.

[0019] Furthermore, the portion of the slagging probe extending into the furnace is provided with thermocouples at preset intervals.

[0020] The present invention discloses a system for determining the actual proportion of coal blended with kaolin, comprising:

[0021] A first determination module is used to determine the type of kaolin ore sample;

[0022] An arrangement module is used to arrange slagging probes at the fire detection holes in the slagging-prone area of ​​the boiler;

[0023] The second determination module is used to determine the load of the boiler and the test duration;

[0024] A third determination module is used to determine the maximum air supply volume of the boiler;

[0025] The fourth determination module is used to take the maximum feed amount of the kaolin ore sample according to the load of the boiler, the test duration and the maximum air supply volume, test the anti-slagging effect through the slagging probe, and then gradually reduce the feed amount until the minimum feed amount that can achieve the anti-smashing effect is reached, and calculate the actual ratio of coal blended with kaolin according to the minimum feed amount and the current feed amount.

[0026] The further improvement of the system for determining the actual proportion of coal blended with kaolin in the present invention is:

[0027] Furthermore, the process of arranging the slagging probe at the fire detection hole in the slagging-prone area of ​​the boiler is as follows:

[0028] The slagging-prone area of ​​the boiler is determined, and then a slagging probe is arranged at the fire detection hole in the slagging-prone area of ​​the boiler.

[0029] Furthermore, the process of determining the boiler load and the test duration is as follows:

[0030] The slagging characteristic test of the slagging probe is carried out under different boiler loads to test the influence of boiler load and slagging duration on the slagging characteristic of the slagging probe and determine the boiler load and test duration.

[0031] Furthermore, the process of determining the maximum air supply volume of the boiler is as follows:

[0032] Insert the slagging probe into the furnace, adjust the amount of compressed air to make the wall temperature of the slagging probe the same as the wall temperature of the water-cooled wall in this area, adjust the conveying air volume of the slagging agent adding device, observe the effect of the conveying air flow on the slagging on the slagging probe, take out the slagging probe after continuously supplying air for a predetermined time, and when the conveying air affects the slagging, reduce the conveying air volume until the conveying air has no effect on the slagging, and determine the air supply volume at this time.

[0033] The present invention has the following beneficial effects:

[0034] The method and system for determining the actual proportion of coal blended with kaolin described in the present invention adopt a progressive approach to determine the minimum feed amount of the kaolin ore sample during specific operation. Specifically, the maximum feed amount of the kaolin ore sample is taken, and the anti-slagging effect is tested by a slagging probe, and then the feed amount is gradually reduced until the minimum feed amount that can achieve the anti-smashing effect is reached. The actual proportion of coal blended with kaolin is calculated based on the minimum feed amount and the current feed amount, so as to solve the serious slagging and contamination problems of in-service boilers burning Zhundong coal. Blending with an appropriate proportion of kaolin can better inhibit the slagging and contamination of Zhundong coal, and can achieve long-term safe and high-proportion combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 Schematic diagram of the kaolin sample addition apparatus. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0040] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0041] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0042] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0045] Embodiment 1

[0046] The method for determining the actual proportion of coal blended with kaolin in the present invention comprises the following steps:

[0047] 1) Select the type of kaolin ore sample.

[0048] 2) determining the boiler slagging prone area, and arranging a slagging probe at the fire detection hole in the boiler slagging prone area;

[0049] Specifically, the boiler slagging prone areas are determined through numerical simulation and field observation;

[0050] 3) Conduct slagging characteristics test on kaolin ore samples without additives,

[0051] Specifically, the slagging characteristic test of the slagging probe is carried out under different boiler loads to test the influence of boiler load and slagging duration on the slagging characteristic of the slagging probe, and to determine the boiler load and test duration selected for subsequent tests.

[0052] 4) Conduct a test on the conveying air volume with the addition of kaolin ore samples

[0053] Specifically, the kaolin ore samples are transported by compressed air. Before the test, the effect of the conveying air volume on slagging is tested first, and the conveying air volume is determined. During the test, the slagging probe is extended into the furnace, and the amount of compressed air is adjusted to make the wall temperature of the slagging probe the same as the wall temperature of the water-cooled wall in this area. The conveying air volume of the slagging agent adding device is adjusted to different values, and the effect of the conveying air flow on the slagging on the slagging probe is observed. The slagging probe is taken out after continuous air supply for a predetermined time. When the conveying air affects the slagging, the conveying air volume is reduced until the conveying air has no effect on the slagging. The air supply volume at this time is determined, and the conveying air volume is kept no higher than this air volume in subsequent tests of adding kaolin ore samples.

[0054] 5) Kaolin ore sample addition test;

[0055] refer to Figure 1 After determining the test load, slagging test duration and conveying air volume, a comparative test on the anti-slagging effect of kaolin ore samples is carried out. That is, when testing various types of kaolin additive samples, the maximum feed amount of kaolin ore samples is first taken, and the anti-slagging effect is tested, and then the feed amount is gradually reduced until the minimum feed amount that can achieve the anti-slagging effect is obtained. The actual proportion of coal blended with kaolin is calculated based on the minimum feed amount and the current coal feed amount.

[0056] It should be noted that the present invention extends a slagging probe into the furnace, controls the probe wall temperature to be the same as the water-cooled wall wall temperature by adjusting the cooling air flow rate in the slagging probe, and simulates the slagging process on the water-cooled wall with the slagging process on the slagging probe. The anti-slagging effect of the additive is judged by the changes in the slagging morphology on the surface of the slagging probe under different working conditions.

[0057] The slagging probe in the present invention uses a stainless steel tube with an outer diameter of 60mm, and the length of the part extending into the furnace is 100mm. An inner sleeve is provided in the probe, and compressed air is sprayed onto the inner surface of the probe through the inner sleeve to cool the probe. The part of the probe extending into the furnace is equipped with thermocouples every 30mm to monitor the tube wall temperature, with a total of 3 thermocouples installed. Through the reasonable design of the compressed air holes on the inner sleeve, it can be ensured that the measured tube wall temperature difference is no more than 50°C. The kaolin sample additive for the test is pre-processed into powder and delivered into the furnace by pneumatic conveying. The conveying air volume is measured by a float flowmeter, and the air volume can be adjusted. The kaolin sample additive is loaded into the slag removal agent bin according to the required amount, enters the mixer through a screw feeder, and is carried into the conveying pipeline by compressed air. The additive feeding amount is achieved by adjusting the screw speed by a speed regulating motor, and the maximum feeding amount is 35g / min. The distance and angle between the additive injection port and the slagging probe are specially designed to ensure that the additive airflow does not directly flush the probe and affect the slagging process, and that the additive can be sprayed onto the slagging probe surface along with the flue gas airflow.

[0058] Embodiment 2

[0059] The system for determining the actual proportion of coal blended with kaolin of the present invention comprises:

[0060] A first determination module is used to determine the type of kaolin ore sample;

[0061] An arrangement module is used to arrange slagging probes at the fire detection holes in the slagging-prone area of ​​the boiler;

[0062] The second determination module is used to determine the load of the boiler and the test duration;

[0063] A third determination module is used to determine the maximum air supply volume of the boiler;

[0064] The fourth determination module is used to take the maximum feed amount of the kaolin ore sample according to the load of the boiler, the test duration and the maximum air supply volume, test the anti-slagging effect through the slagging probe, and then gradually reduce the feed amount until the minimum feed amount that can achieve the anti-smashing effect is reached, and calculate the actual ratio of coal blended with kaolin according to the minimum feed amount and the current feed amount.

[0065] As an embodiment of the present invention, the process of arranging the slagging probe at the fire detection hole in the slagging-prone area of ​​the boiler is as follows:

[0066] The slagging-prone area of ​​the boiler is determined, and then a slagging probe is arranged at the fire detection hole in the slagging-prone area of ​​the boiler.

[0067] As an implementation mode of the present invention, the process of determining the boiler load and the test duration is as follows:

[0068] The slagging characteristic test of the slagging probe is carried out under different boiler loads to test the influence of boiler load and slagging duration on the slagging characteristic of the slagging probe and determine the boiler load and test duration.

[0069] As an implementation mode of the present invention, the process of determining the maximum air supply volume of the boiler is as follows:

[0070] Insert the slagging probe into the furnace, adjust the amount of compressed air to make the wall temperature of the slagging probe the same as the wall temperature of the water-cooled wall in this area, adjust the conveying air volume of the slagging agent adding device, observe the effect of the conveying air flow on the slagging on the slagging probe, take out the slagging probe after continuously supplying air for a predetermined time, and when the conveying air affects the slagging, reduce the conveying air volume until the conveying air has no effect on the slagging, and determine the air supply volume at this time.

[0071] Embodiment 3

[0072] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for determining the actual proportion of coal blended with kaolin are implemented, for example, wherein the memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0073] Embodiment 4

[0074] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for determining the actual proportion of coal blended with kaolin are implemented. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0075] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0076] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0077] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0078] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0079] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0080] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0081] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for determining the actual proportion of coal blended with kaolin, characterized in that: include: Determine the type of kaolin ore sample; Arrange slagging probes at the fire detection holes in the boiler's slagging prone areas; Determine the boiler load and test duration; Determine the maximum air flow rate of the boiler; According to the load of the boiler, test duration and maximum air supply, the maximum feed amount of the kaolin ore sample is taken, and the anti-slagging effect is tested by a slag probe, and then the feed amount is gradually reduced until the minimum feed amount that can achieve the anti-smashing effect is reached. The actual ratio of coal blended with kaolin is calculated based on the minimum feed amount and the current feed amount.

2. The method for determining the actual proportion of coal blended with kaolin according to claim 1, characterized in that: The process of arranging the slagging probe at the fire detection hole in the slagging-prone area of ​​the boiler is as follows: The slagging-prone area of ​​the boiler is determined, and then a slagging probe is arranged at the fire detection hole in the slagging-prone area of ​​the boiler.

3. The method for determining the actual proportion of coal blended with kaolin according to claim 2, characterized in that: The boiler slagging prone areas are determined through numerical simulation and field observation.

4. The method for determining the actual proportion of coal blended with kaolin according to claim 1, characterized in that: The process of determining the boiler load and test duration is as follows: The slagging characteristic test of the slagging probe is carried out under different boiler loads to test the influence of boiler load and slagging duration on the slagging characteristic of the slagging probe and determine the boiler load and test duration.

5. The method for determining the actual proportion of coal blended with kaolin according to claim 1, characterized in that: The process of determining the maximum air supply volume of the boiler is as follows: Insert the slagging probe into the furnace, adjust the amount of compressed air to make the wall temperature of the slagging probe the same as the wall temperature of the water-cooled wall in this area, adjust the conveying air volume of the slagging agent adding device, observe the effect of the conveying air flow on the slagging on the slagging probe, take out the slagging probe after continuously supplying air for a predetermined time, and when the conveying air affects the slagging, reduce the conveying air volume until the conveying air has no effect on the slagging, and determine the air supply volume at this time.

6. The method for determining the actual proportion of coal blended with kaolin according to claim 1, characterized in that: The part of the slagging probe extending into the furnace is equipped with thermocouples at preset intervals.

7. A system for determining the actual proportion of coal blended with kaolin, characterized in that: include: A first determination module is used to determine the type of kaolin ore sample; An arrangement module is used to arrange slagging probes at the fire detection holes in the slagging-prone area of ​​the boiler; The second determination module is used to determine the load of the boiler and the test duration; A third determination module is used to determine the maximum air supply volume of the boiler; The fourth determination module is used to take the maximum feed amount of the kaolin ore sample according to the load of the boiler, the test duration and the maximum air supply volume, test the anti-slagging effect through the slagging probe, and then gradually reduce the feed amount until the minimum feed amount that can achieve the anti-smashing effect is reached, and calculate the actual ratio of coal blended with kaolin according to the minimum feed amount and the current feed amount.

8. The system for determining the actual proportion of coal blended with kaolin according to claim 7, characterized in that: The process of arranging the slagging probe at the fire detection hole in the slagging-prone area of ​​the boiler is as follows: The slagging-prone area of ​​the boiler is determined, and then a slagging probe is arranged at the fire detection hole in the slagging-prone area of ​​the boiler.

9. The system for determining the actual proportion of coal blended with kaolin according to claim 7, characterized in that: The process of determining the boiler load and test duration is as follows: The slagging characteristic test of the slagging probe is carried out under different boiler loads to test the influence of boiler load and slagging duration on the slagging characteristic of the slagging probe and determine the boiler load and test duration.

10. The system for determining the actual proportion of coal blended with kaolin according to claim 7, characterized in that: The process of determining the maximum air supply volume of the boiler is as follows: Insert the slagging probe into the furnace, adjust the amount of compressed air to make the wall temperature of the slagging probe the same as the wall temperature of the water-cooled wall in this area, adjust the conveying air volume of the slagging agent adding device, observe the effect of the conveying air flow on the slagging on the slagging probe, take out the slagging probe after continuously supplying air for a predetermined time, and when the conveying air affects the slagging, reduce the conveying air volume until the conveying air has no effect on the slagging, and determine the air supply volume at this time.

Images