Coal resource high-utilization and high-conversion method based on coal blending combustion

Abstract

The invention discloses a coal resource high-utilization and high-conversion method based on coal blending combustion. The method comprises the following steps: 1, acquiring data and coal performance of a corresponding boiler; 2, selecting an optimal coal blending combustion scheme under the maximum use power according to the data of the boiler; 3, coal blending combustion schemes in different time periods are selected according to the steam demand quantity in the different time periods and the data of the boiler; 4, recording the coal blending combustion scheme and the corresponding predicted steam production data; 5, the coal consumption, the steam generation amount and the steam generation efficiency are recorded in real time; and 6, comparing the actual recorded numerical value with the predicted numerical value, and adjusting the coal blending combustion scheme according to a comparison result. According to the invention, the coal blending combustion technology is adopted, and on the basis of the coal blending combustion technology, different types and proportions of coal for coal blending combustion as well as the addition amount and the addition rate in a fixed time period are selected according to different steam requirements in different time periods, so that resources can be saved while the steam generation amount is ensured.

Description

Technical Field

[0001] The invention belongs to the field of coal resource utilization through blending and co-firing, and in particular to a method for high utilization and high conversion of coal resources based on blending and co-firing. Background Art

[0002] Coal is one of the important resources nowadays. Power generation in northern my country and heating in winter both consume a lot of coal. With the continuous development of society and technology, such as the development of 5G technology, a large number of 5G base stations need to be built to replace the original 3G / 4G base stations. The power consumption of 5G base stations is much greater than that of 3G / 4G base stations. Therefore, the demand for coal is increasing year by year. However, coal reserves and mining capacity are limited, so the demand for coal is becoming increasingly tight. At present, power generation and heating operations generally use boilers to generate steam for operation. Due to the increasing tightness of coal resources, the direct use of clean coal will cause a certain degree of waste of coal resources. Summary of the invention

[0003] The present invention provides a method for high utilization and high conversion of coal resources based on blended coal combustion, so as to solve the defects in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] The method for high utilization and high conversion of coal resources based on blended coal combustion includes the following steps:

[0006] Step 1: Obtain data on the corresponding boiler and conduct detailed performance tests on different types of coal;

[0007] Step 2: Select the type of coal, proportion, addition amount and addition rate for the optimal coal blending at the maximum power according to the boiler data;

[0008] Step 3: According to the steam demand in different time periods and the data of the boiler, the type and ratio of coal for blending and burning in different time periods, as well as the amount and rate of addition in a fixed time period are selected;

[0009] Step 4: Record the type and proportion of coal for the optimal coal blending at the maximum power of the boiler obtained in step 2, as well as the amount and rate of addition in a fixed time period, the estimated steam generation, and the steam generation efficiency; also record the type and proportion of coal for the optimal coal blending at the maximum power of the boiler obtained in step 2, as well as the amount and rate of addition in a fixed time period, the estimated steam generation, and the steam generation efficiency in different time periods;

[0010] Step 5: Real-time recording of coal consumption, steam generation and steam generation efficiency of different types in each time period;

[0011] Step six: Compare the actual recorded coal consumption, steam output and steam output efficiency of different types with the scheduled coal types, proportions, addition amounts and addition rates in fixed time periods and the expected steam generation and steam generation efficiency in different time periods. Based on the comparison results, determine whether it is necessary to adjust the coal types, proportions, addition amounts and addition rates in fixed time periods.

[0012] As described above, in the method for high utilization and high conversion of coal resources based on blended combustion, the boiler data in step one includes boiler water capacity, boiler heat exchange efficiency and boiler power, i.e., the amount of steam produced by the boiler per unit time.

[0013] As described above, in the method for high utilization and high conversion of coal resources based on blended combustion, the properties of different types of coal obtained by the performance testing of different types of coal in step one include calorific value, ash content, ash melting point, volatile matter, grindability and combustion efficiency.

[0014] In the method for high utilization and high conversion of coal resources based on blended coal combustion as described above, in the steps three and five, the time periods are divided into time intervals of 1-4 hours according to actual usage.

[0015] As described above, in the method for high utilization and high conversion of coal resources based on coal blending and combustion, in the step four, it is necessary to carry out simulation tests on the expected type of coal for coal blending and combustion, as well as the amount and rate of addition within a fixed time period, according to the expected steam generation and steam generation efficiency. If the expected steam generation and steam generation efficiency cannot be achieved or both the steam generation and steam generation efficiency are improved, it is necessary to adjust the type of coal for coal blending and combustion, as well as the amount and rate of addition within a fixed time period, to ensure that the steam generation and steam generation efficiency are guaranteed with the most energy-saving type of coal for coal blending and combustion, as well as the amount and rate of addition within a fixed time period.

[0016] In the method for high utilization and high conversion of coal resources based on blended coal combustion as described above, if in step six the error between the actual steam generation and steam generation efficiency in different time periods and the expected steam generation and steam generation efficiency does not exceed ±3%, then the corresponding coal type, proportion, and addition amount and addition rate in a fixed time period for the blended coal combustion are considered to be reasonable and do not need to be adjusted.

[0017] In the method for high utilization and high conversion of coal resources based on blended combustion as described above, in step six, when a problem occurs, it is necessary to test the heat exchange efficiency of the boiler.

[0018] As described above, in the method for high utilization and high conversion of coal resources based on blended combustion, if the heat exchange efficiency of the boiler is lower than the given heat exchange efficiency, it is necessary to detect whether there is an excessively thick layer of attachments on the inner wall of the boiler and the inner wall of the water chamber, and whether there is water leakage in the water chamber.

[0019] In the method for high utilization and high conversion of coal resources based on blended coal combustion as described above, if in the step six the actual steam generation and steam generation efficiency in different time periods are the same as the expected steam generation and steam generation efficiency, but the consumption of different types of coal increases, or the steam generation and steam generation efficiency decrease under the predetermined coal type, ratio, and addition amount and addition rate in a fixed time period for the blended coal combustion, it is necessary to inspect the boiler and determine whether it is necessary to change the coal type, ratio, and addition amount and addition rate in a fixed time period for the blended coal combustion based on the inspection result of the boiler.

[0020] In the method for high utilization and high conversion of coal resources based on coal blending and combustion as described above, if in step six the actual steam generation and steam generation efficiency are higher than the expected steam generation and steam generation efficiency when using the predetermined coal type, ratio, addition amount and addition rate in a fixed time period for the coal blending and combustion, it is necessary to adjust the coal type, ratio, addition amount and addition rate in a fixed time period for the coal blending and combustion, so as to save coal resources.

[0021] The advantages of the present invention are: the present invention adopts the technology of coal blending and combustion and on this basis selects different coal types, proportions and addition amounts and addition rates within a fixed time period according to different steam demands in different time periods, thereby ensuring the steam generation while saving resources to the maximum extent. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with 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.

[0023] The method for high utilization and high conversion of coal resources based on blended coal combustion includes the following steps:

[0024] Step 1: Obtain data on the corresponding boiler and conduct detailed performance tests on different types of coal;

[0025] Step 2: Select the type of coal, proportion, addition amount and addition rate for the optimal coal blending at the maximum power according to the boiler data;

[0026] Step 3: According to the steam demand in different time periods and the data of the boiler, the type and ratio of coal for blending and burning in different time periods, as well as the amount and rate of addition in a fixed time period are selected;

[0027] Step 4: Record the type and proportion of coal for the optimal coal blending at the maximum power of the boiler obtained in step 2, as well as the amount and rate of addition in a fixed time period, the estimated steam generation, and the steam generation efficiency; also record the type and proportion of coal for the optimal coal blending at the maximum power of the boiler obtained in step 2, as well as the amount and rate of addition in a fixed time period, the estimated steam generation, and the steam generation efficiency in different time periods;

[0028] Step 5: Real-time recording of coal consumption, steam generation and steam generation efficiency of different types in each time period;

[0029] Step six: Compare the actual recorded coal consumption, steam output and steam output efficiency of different types with the scheduled coal types, proportions, addition amounts and addition rates in fixed time periods and the expected steam generation and steam generation efficiency in different time periods. Based on the comparison results, determine whether it is necessary to adjust the coal types, proportions, addition amounts and addition rates in fixed time periods.

[0030] Specifically, the boiler data in step 1 described in this embodiment includes boiler water capacity, boiler heat exchange efficiency, and boiler power, that is, the amount of steam produced by the boiler per unit time.

[0031] Specifically, the properties of the different types of coal obtained by the performance test of the different types of coal in step 1 of this embodiment include calorific value, ash content, ash melting point, volatile matter, grindability and combustion efficiency.

[0032] More specifically, in step 3 and step 5 described in this embodiment, the time period is divided into time intervals of 1-4 hours according to actual usage.

[0033] More specifically, in step four described in this embodiment, it is necessary to conduct simulation tests on the expected type of coal, ratio, and amount and rate of addition in a fixed time period for the coal blending according to the expected steam generation and steam generation efficiency. If the expected steam generation and steam generation efficiency cannot be achieved or the steam generation and steam generation efficiency are improved, it is necessary to adjust the type of coal, ratio, and amount and rate of addition in a fixed time period for the coal blending to ensure that the steam generation and steam generation efficiency are guaranteed with the most energy-saving type of coal, ratio, amount and rate of addition in a fixed time period.

[0034] To be more specific, in step six described in this embodiment, if the error between the actual steam generation and steam generation efficiency in different time periods and the expected steam generation and steam generation efficiency does not exceed ±3%, it is considered that the corresponding coal type, ratio, addition amount and addition rate in a fixed time period are reasonable and do not need to be adjusted.

[0035] Furthermore, in step six of this embodiment, when a problem occurs, the heat exchange efficiency of the boiler needs to be tested.

[0036] Furthermore, if the heat exchange efficiency of the boiler described in this embodiment is lower than the given heat exchange efficiency, it is necessary to detect whether there is an excessively thick layer of attachments on the inner wall of the boiler and the inner wall of the water cavity and whether there is water leakage in the water cavity.

[0037] Furthermore, in step six described in this embodiment, if the actual steam generation and steam generation efficiency in different time periods are the same as the expected steam generation and steam generation efficiency, but the consumption of different types of coal increases, or the steam generation and steam generation efficiency decrease under the conditions of the predetermined coal type, ratio, and addition amount and addition rate in a fixed time period for the coal blending, it is necessary to inspect the boiler and determine whether it is necessary to change the coal type, ratio, and addition amount and addition rate in the fixed time period for the coal blending based on the inspection results of the boiler.

[0038] Furthermore, in step six described in this embodiment, if the actual steam generation and steam generation efficiency are higher than the expected steam generation and steam generation efficiency when the predetermined coal type, ratio, addition amount and addition rate are used for blending, it is necessary to adjust the coal type, ratio, addition amount and addition rate within the fixed time period for blending, so as to save coal resources.

[0039] The present invention was used to improve the coal blending and combustion technology in an offline power plant for three months, and then the data before and after use were compared. It was found that after using the technology of the present invention, the coal consumption per kilowatt-hour was reduced by 0.02kg, and the clean coal consumption per kilowatt-hour was reduced by 0.11kg. Therefore, after using the technology of the present invention, the use of coal can be effectively reduced under the premise of ensuring normal use, effectively saving coal resources and reducing production costs.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for high utilization and high conversion of coal resources based on blended coal combustion, characterized in that: The steps include: Step 1: Obtain data on the corresponding boiler and conduct detailed performance tests on different types of coal; Step 2: Select the type of coal, proportion, addition amount and addition rate for the optimal coal blending at the maximum power according to the boiler data; Step 3: According to the steam demand in different time periods and the data of the boiler, the type and ratio of coal for blending and burning in different time periods, as well as the amount and rate of addition in a fixed time period are selected; Step 4: Record the type and proportion of coal for the optimal coal blending at the maximum power of the boiler obtained in step 2, as well as the amount and rate of addition in a fixed time period, the estimated steam generation, and the steam generation efficiency; also record the type and proportion of coal for the optimal coal blending at the maximum power of the boiler obtained in step 2, as well as the amount and rate of addition in a fixed time period, the estimated steam generation, and the steam generation efficiency in different time periods; Step 5: Real-time recording of coal consumption, steam generation and steam generation efficiency of different types in each time period; Step six: Compare the actual recorded coal consumption, steam output and steam output efficiency of different types with the scheduled coal types, proportions, addition amounts and addition rates in fixed time periods and the expected steam generation and steam generation efficiency in different time periods. Based on the comparison results, determine whether it is necessary to adjust the coal types, proportions, addition amounts and addition rates in fixed time periods.

2. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: The boiler data in step 1 include boiler water capacity, boiler heat exchange efficiency and boiler power, that is, the amount of steam produced by the boiler per unit time.

3. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: The properties of the different types of coal obtained by the performance test of the different types of coal in step 1 include calorific value, ash content, ash melting point, volatile matter, grindability and combustion efficiency.

4. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: In the steps 3 and 5, the time periods are divided into time intervals of 1-4 hours according to actual usage.

5. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: In the step 4, it is necessary to conduct simulation tests on the expected type of coal, ratio, amount added within a fixed time period and addition rate for the coal blending according to the expected steam generation and steam generation efficiency. If the expected steam generation and steam generation efficiency cannot be achieved or the steam generation and steam generation efficiency are improved, it is necessary to adjust the type of coal, ratio, amount added within a fixed time period and addition rate for the coal blending to ensure that the steam generation and steam generation efficiency are guaranteed with the most energy-saving type of coal, ratio, amount added within a fixed time period and addition rate.

6. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: In step six, if the actual steam generation and steam generation efficiency in different time periods have an error of no more than ±3% from the expected steam generation and steam generation efficiency, it is considered that the corresponding coal type, ratio, addition amount and addition rate in a fixed time period are reasonable and do not need to be adjusted.

7. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: In step six, when a problem occurs, the heat exchange efficiency of the boiler needs to be tested.

8. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 7, characterized in that: If the heat exchange efficiency of the boiler is lower than the given heat exchange efficiency, it is necessary to detect whether there is an excessively thick layer of attachments on the inner wall of the boiler and the inner wall of the water cavity and whether there is water leakage in the water cavity.

9. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: If in the step six, the actual steam generation and steam generation efficiency in different time periods are the same as the expected steam generation and steam generation efficiency, but the consumption of different types of coal increases, or the steam generation and steam generation efficiency decrease under the conditions of the predetermined coal type, ratio, and addition amount and addition rate in a fixed time period, it is necessary to inspect the boiler and determine whether it is necessary to change the coal type, ratio, and addition amount and addition rate in the fixed time period for the coal blending.

10. The method for high utilization and high conversion of coal resources based on blended coal combustion according to claim 1, characterized in that: In the step six, if the actual steam generation and steam generation efficiency are higher than the expected steam generation and steam generation efficiency when using the predetermined coal type, ratio, addition amount and addition rate within a fixed time period, it is necessary to adjust the coal type, ratio, addition amount and addition rate within a fixed time period for the coal blending, so as to save coal resources.