Method and system for adjusting blending amount of different coal types

Abstract

This invention relates to the field of coal combustion technology, specifically to a method and system for adjusting the blending ratio of different coal types. The method includes: presetting a blending ratio AO of an economical coal type among all coal types; obtaining the moisture content and ash fusion characteristics of the economical coal type; selecting a corresponding adjustment coefficient based on the moisture content and ash fusion characteristics of the economical coal type to adjust the blending ratio once, obtaining a first-adjusted blending ratio A1; obtaining combustion data during combustion according to the first-adjusted blending ratio A1, selecting a corresponding correction coefficient to adjust the first-adjusted blending ratio A1 a second time, obtaining a final blending ratio A2. This invention dynamically adjusts the preset blending ratio of the economical coal type among all coal types, avoiding the increase in flue gas temperature due to excessively high moisture content in the coal entering the furnace, which would lead to a decrease in boiler thermal efficiency. It also avoids the increased risk of boiler coking due to the low ash fusion point of the economical coal type, thus preventing potential safety hazards to the boiler operation.

Description

Technical Field

[0001] This invention relates to the field of coal combustion technology, and more specifically, to a method and system for adjusting the blending amount of different coal types. Background Technology

[0002] The impact of coal quality changes on boiler operation is mainly reflected in two aspects: economy and safety. Compared with the design coal type, the main difference of the economic coal type lies in the significant differences in moisture, ash, volatile matter and lower heating value.

[0003] The moisture content of the economic coal type is about twice that of the design coal type. Due to the increased moisture content of the coal entering the furnace, the water absorbs a large amount of heat and vaporizes within the furnace. Since the specific heat capacity of water vapor is greater than that of dry flue gas, the exhaust gas temperature rises and the flue gas volume increases, leading to increased boiler exhaust losses and decreased boiler efficiency. Simultaneously, the economic coal type has a low ash fusion point and is prone to coking. Burning low-ash-fusion-point coal inevitably increases the probability and severity of coking, and severe coking can even affect the safe operation of the boiler.

[0004] Therefore, there is an urgent need for a method to adjust the blending amount of coal to improve the economic efficiency of coal combustion and solve the problem of reduced boiler efficiency due to high moisture content of coal fed into the furnace and boiler coking. Summary of the Invention

[0005] In view of this, the present invention proposes a method and system for adjusting the blending amount of different coal types, mainly to solve the problem of reduced boiler efficiency due to high moisture content of coal entering the furnace and boiler coking when different coal types are blended and burned in the prior art.

[0006] In one aspect, the present invention proposes a method for adjusting the blending amount of different coal types, the method comprising:

[0007] The preset blending ratio of economic coal types to all coal types is AO;

[0008] Obtain the moisture content and ash fusion characteristics of economical coal types;

[0009] Based on the moisture value and ash melting characteristics of the economic coal type, the corresponding adjustment coefficient is selected to adjust the blending ratio once, resulting in an adjusted blending ratio A1.

[0010] By acquiring the combustion data during combustion based on the first adjusted blending ratio A1, selecting the corresponding correction coefficient, and performing a second adjustment on the first adjusted blending ratio A1, the final blending ratio A2 is obtained.

[0011] In some embodiments of this application, obtaining the ash melting characteristic values ​​includes softening temperature and melting temperature, and the combustion data includes exhaust gas temperature and primary air fan outlet air volume.

[0012] In some embodiments of this application, the adjustment includes:

[0013] Obtain the moisture value B0 of the economic coal type, and pre-set the first preset moisture value B1, the second preset moisture value B2, the third preset moisture value B3, and the fourth preset moisture value B4, where B1 < B2 < B3 < B4; pre-set the first adjustment coefficient b1, the second preset adjustment coefficient b2, the third preset adjustment coefficient b3, and the fourth preset adjustment coefficient b4, where 1 > b1 > b2 > b3 > b4 > 0.9;

[0014] When B1≤B0<B2, the first preset adjustment coefficient b1 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b1;

[0015] When B2≤B0<B3, the second preset adjustment coefficient b2 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b2;

[0016] When B3≤B0<B4, the third preset adjustment coefficient b3 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b3;

[0017] When B4≤B0, the fourth preset adjustment coefficient b4 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b4.

[0018] In some embodiments of this application, after selecting the i-th preset adjustment coefficient bi to adjust the preset blending ratio A0, i = 1, 2, 3, 4, and obtaining the adjusted blending ratio A0*bi, the method further includes:

[0019] Obtain the softening temperature value T1;

[0020] A first preset softening temperature value C1, a second preset softening temperature value C2, a third preset softening temperature value C3, and a fourth preset softening temperature value C4 are preset, and C1 < C2 < C3 < C4; a first preset adjustment coefficient c1, a second preset adjustment coefficient c2, a third preset adjustment coefficient c3, and a fourth preset adjustment coefficient c4 are preset, and 0.9 < c1 < c2 < 1 < c3 < c4 < 1.1;

[0021] When C1≤T1<C2, the first preset adjustment coefficient c1 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c1;

[0022] When C2≤T1<C3, the second preset adjustment coefficient c2 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c2;

[0023] When C3≤T1<C4, the third preset adjustment coefficient c3 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c3;

[0024] When C4≤T1, the fourth preset adjustment coefficient c4 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c4.

[0025] In some embodiments of this application, after selecting the i-th preset adjustment coefficient ci to adjust the blending ratio A0*bi, i = 1, 2, 3, 4, and obtaining the adjusted blending ratio A0*bi*ci, the method further includes:

[0026] Obtain the melting temperature value T2;

[0027] A first preset melting temperature value D1, a second preset melting temperature value D2, a third preset melting temperature value D3, and a fourth preset melting temperature value D4 are preset, and D1 < D2 < D3 < D4; a first preset adjustment coefficient d1, a second preset adjustment coefficient d2, a third preset adjustment coefficient d3, and a fourth preset adjustment coefficient d4 are preset, and 0.9 < d1 < d2 < 1 < d3 < d4 < 1.1;

[0028] When D1≤T2<D2, the first preset adjustment coefficient d1 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d1;

[0029] When D2≤T2<D3, the second preset adjustment coefficient d2 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d2;

[0030] When D3≤T2<D4, the third preset adjustment coefficient d3 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d3;

[0031] When D4≤T2, the fourth preset adjustment coefficient d4 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d4.

[0032] The blending ratio A0*bi*ci is adjusted by selecting the i-th preset adjustment coefficient di, i = 1, 2, 3, 4, and the adjusted blending ratio A0*bi*ci*di is taken as the first-time adjusted blending ratio A1.

[0033] In some embodiments of this application, when making a secondary adjustment to the first-adjusted blending ratio A1, the following steps are included:

[0034] Obtain the primary air fan outlet air volume M0 and the flue gas temperature T3;

[0035] The first preset primary air outlet air volume M1, the second preset primary air outlet air volume M2, the third preset primary air outlet air volume M3, and the fourth preset primary air outlet air volume M4 are preset, and M1 < M2 < M3 < M4; the first preset adjustment coefficient m1, the second preset adjustment coefficient m2, the third preset adjustment coefficient m3, and the fourth preset adjustment coefficient m4 are preset, and 0.9 < m1 < m2 < 1 < m3 < m4 < 1.1;

[0036] When M1≤T3<M2, the first preset adjustment coefficient m1 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m1;

[0037] When M2≤T3<M3, the second preset adjustment coefficient m2 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m2;

[0038] When M3≤T3<M4, the fourth preset adjustment coefficient m3 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m3;

[0039] When M4≤T3, the fourth preset adjustment coefficient m4 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m4.

[0040] In some embodiments of this application, after selecting the i-th preset adjustment coefficient mi to adjust the exhaust gas temperature T3, i = 1, 2, 3, 4, and obtaining the adjusted exhaust gas temperature T3*mi, the method further includes:

[0041] The first preset smoke exhaust temperature value N1, the second preset smoke exhaust temperature value N2, the third preset smoke exhaust temperature value N3, and the fourth preset smoke exhaust temperature value N4 are preset, and N1 < N2 < N3 < N4; the first preset correction coefficient n1, the second preset correction coefficient n2, the third preset correction coefficient n3, and the fourth preset correction coefficient n4 are preset, and 0.9 < n4 < n3 < 1 < n2 < n1 < 1.1;

[0042] When N1≤T3*mi<N2, the first preset correction coefficient n1 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n1;

[0043] When N2≤T3*mi<N3, the second preset correction coefficient n2 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n2;

[0044] When N3≤T3*mi<N4, the third preset correction coefficient n3 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n3;

[0045] When N4≤T3*mi<N2, the fourth preset correction coefficient n4 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n4;

[0046] The first-adjusted blending ratio A1 is adjusted a second time by selecting the i-th preset correction coefficient ni, i = 1, 2, 3, 4, and the adjusted first-adjusted blending ratio A1*ni is taken as the final blending ratio A2.

[0047] In another aspect, the present invention proposes a system for adjusting the blending amount of different coal types, the system comprising:

[0048] The information acquisition module is used to acquire the moisture content and ash melting characteristics of economic coal types.

[0049] An information storage module is used to store information from the information acquisition module;

[0050] The information processing module presets the blending ratio AO of economic coal type to all coal types, extracts information from the information storage module to adjust A0, and determines the final blending ratio A2 of economic coal type to all coal types.

[0051] In some embodiments of this application, the step of extracting information from the information storage module to adjust A0 further includes:

[0052] The blending ratio is adjusted once based on the moisture value and ash melting characteristics of the economic coal type to obtain an adjusted blending ratio A1.

[0053] The combustion data obtained during combustion based on the first adjusted blending ratio A1 is used to make a second adjustment to obtain the final blending ratio A2.

[0054] In some embodiments of this application, the ash melting characteristic values ​​include softening temperature and melting temperature, and the combustion data include exhaust gas temperature and primary air fan outlet air volume.

[0055] Compared with the prior art, the present invention has the following beneficial effects: The present invention adjusts the preset blending ratio of economic coal type to all coal types by obtaining the moisture value and ash melting characteristic value of economic coal type. When the moisture value and ash melting characteristic value of economic coal type are within the preset adjustment range, the preset blending ratio is adjusted by the adjustment coefficient to avoid the increase of flue gas temperature due to excessive moisture of coal type entering the furnace, which would lead to a decrease in boiler thermal efficiency. At the same time, it avoids the risk of boiler coking due to the low ash melting point of economic coal type, which would pose a hidden danger to the safe operation of boiler. Attached Figure Description

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. In the drawings:

[0057] Figure 1 A flowchart illustrating a method for adjusting the blending amount of different coal types, provided in an embodiment of the present invention;

[0058] Figure 2 This is a functional block diagram of a system for adjusting the blending amount of different coal types, provided in an embodiment of the present invention. Detailed Implementation

[0059] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0060] Boiler coking refers to the accumulation of fuel in localized areas at the burner nozzles, fuel bed, or heating surfaces, forming coke deposits under high-temperature, low-oxygen conditions. In the center of the boiler furnace, the flame temperature is between 1400 and 1600°C. The fuel contains a large amount of ash, which, under high-temperature, oxygen-deficient conditions, mostly melts into a liquid or remains in a softened state. Because the surrounding water-cooled walls continuously absorb heat, the temperature decreases from the center of the flame outwards, with the temperature being lowest closer to the water-cooled walls. As the temperature decreases, the ash will inevitably change from a liquid state to a softened state, then harden into a solid state. If the ash, still in a softened state, comes into contact with a heating surface, it will harden due to sudden cooling and adhere to the heating surface, thus forming coking.

[0061] The basic principle of coal blending in boilers is to utilize the differences in properties of various coals, blending several different types of coal with different properties in a certain proportion, so that each type of coal can complement the others and give full play to its advantages, ultimately making the blended coal meet the boiler design and environmental protection requirements in terms of comprehensive performance.

[0062] The design coal type is the type of coal used by the boiler manufacturer during the design phase. Based on this data, the manufacturer conducts preliminary boiler design and thermal calculations to determine the main operating parameters, performance data, heating surface structure and layout. This is the most commonly used coal type in power plant operation, and the boiler's performance must meet design requirements when using it. Compared to the design coal type, the main difference in economic coal types lies in their significantly higher moisture, ash, volatile matter, and lower heating value. Economic coal types have approximately twice the moisture content of the design coal type. Due to the increased moisture content of the coal entering the furnace, the water absorbs a large amount of heat and vaporizes in the furnace. Since the specific heat capacity of water vapor is greater than that of dry flue gas, the exhaust gas temperature increases, the flue gas volume increases, leading to increased boiler exhaust losses and decreased boiler efficiency. Simultaneously, economic coal types have a low ash fusion point, making them prone to coking. Burning low-ash-fusion-point coal inevitably increases the probability and severity of coking, and severe coking can even affect the safe operation of the boiler.

[0063] See Figure 1 As shown, this embodiment provides a method for adjusting the blending amount of different coal types, including:

[0064] S100: Preset blending ratio of economic coal type to all coal types (AO);

[0065] S200: Obtain the moisture content and ash melting characteristics of economical coal types;

[0066] S300: Based on the moisture value and ash melting characteristic value of the economic coal type, select the corresponding adjustment coefficient to adjust the blending ratio once, and obtain the first adjusted blending ratio A1;

[0067] S400: Obtain the combustion data when combustion is performed according to the first adjusted blending ratio A1, select the corresponding correction coefficient, and perform a second adjustment on the first adjusted blending ratio A1 to obtain the final blending ratio A2.

[0068] Specifically, in this embodiment, the preset blending ratio A0 of economic coal type to all coal types can be the blending ratio of different coal types that the boiler has previously used, or it can be a blending ratio that is specifically set by those skilled in the art based on the boiler's operating status. Those skilled in the art can choose according to the actual situation, and this embodiment does not make specific limitations.

[0069] As can be seen, in this embodiment, the preset blending ratio A0 is adjusted according to the moisture value and ash melting characteristics of the economic coal type before all coal types are put into the furnace for combustion, to obtain the first-adjusted blending ratio A1. The first-adjusted blending ratio A1 is then adjusted according to the combustion data of the coal types blended in the first-adjusted blending ratio A1 during combustion, to obtain the final blending ratio A2. By dynamically adjusting the blending ratio of the economic coal type to all coal types, the risk of boiler coking is reduced, the efficiency and safety of the boiler are ensured, and the cost is reduced.

[0070] Specifically, the ash melting characteristic values ​​obtained include softening temperature and melting temperature, and the combustion data include exhaust gas temperature and primary air fan outlet air volume.

[0071] Specifically, the adjustment includes:

[0072] Obtain the moisture value B0 of the economic coal type, and pre-set the first preset moisture value B1, the second preset moisture value B2, the third preset moisture value B3, and the fourth preset moisture value B4, where B1 < B2 < B3 < B4; pre-set the first adjustment coefficient b1, the second preset adjustment coefficient b2, the third preset adjustment coefficient b3, and the fourth preset adjustment coefficient b4, where 1 > b1 > b2 > b3 > b4 > 0.9;

[0073] When B1≤B0<B2, the first preset adjustment coefficient b1 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b1;

[0074] When B2≤B0<B3, the second preset adjustment coefficient b2 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b2;

[0075] When B3≤B0<B4, the third preset adjustment coefficient b3 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b3;

[0076] When B4≤B0, the fourth preset adjustment coefficient b4 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0*b4.

[0077] As can be seen, in this embodiment, by obtaining the moisture value B0 of the economic coal type, comparing B0 with the preset moisture value adjustment range, and selecting the corresponding adjustment coefficient bi to adjust the preset blending ratio A0, the proportion of the economic coal type in all coal types is reduced when the moisture value of the economic coal type is large, so as to avoid the boiler flue gas temperature from rising due to the excessive moisture value of the coal entering the furnace, thereby affecting the safe operation of the boiler.

[0078] Specifically, after selecting the i-th preset adjustment coefficient bi to adjust the preset blending ratio A0, i = 1, 2, 3, 4, and obtaining the adjusted blending ratio A0*bi, the process further includes:

[0079] Obtain the softening temperature value T1;

[0080] A first preset softening temperature value C1, a second preset softening temperature value C2, a third preset softening temperature value C3, and a fourth preset softening temperature value C4 are preset, and C1 < C2 < C3 < C4; a first preset adjustment coefficient c1, a second preset adjustment coefficient c2, a third preset adjustment coefficient c3, and a fourth preset adjustment coefficient c4 are preset, and 0.9 < c1 < c2 < 1 < c3 < c4 < 1.1;

[0081] When C1≤T1<C2, the first preset adjustment coefficient c1 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c1;

[0082] When C2≤T1<C3, the second preset adjustment coefficient c2 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c2;

[0083] When C3≤T1<C4, the third preset adjustment coefficient c3 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c3;

[0084] When C4≤T1, the fourth preset adjustment coefficient c4 is selected to adjust the adjusted blending ratio A0*bi again, and the adjusted blending ratio is A0*bi*c4.

[0085] Specifically, after selecting the i-th preset adjustment coefficient ci to adjust the blending ratio A0*bi, i = 1, 2, 3, 4, and obtaining the adjusted blending ratio A0*bi*ci, the process further includes:

[0086] Obtain the melting temperature value T2;

[0087] A first preset melting temperature value D1, a second preset melting temperature value D2, a third preset melting temperature value D3, and a fourth preset melting temperature value D4 are preset, and D1 < D2 < D3 < D4; a first preset adjustment coefficient d1, a second preset adjustment coefficient d2, a third preset adjustment coefficient d3, and a fourth preset adjustment coefficient d4 are preset, and 0.9 < d1 < d2 < 1 < d3 < d4 < 1.1;

[0088] When D1≤T2<D2, the first preset adjustment coefficient d1 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d1;

[0089] When D2≤T2<D3, the second preset adjustment coefficient d2 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d2;

[0090] When D3≤T2<D4, the third preset adjustment coefficient d3 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d3;

[0091] When D4≤T2, the fourth preset adjustment coefficient d4 is selected to adjust the adjusted blending ratio A0*bi*ci again, and the adjusted blending ratio is A0*bi*ci*d4.

[0092] The blending ratio A0*bi*ci is adjusted by selecting the i-th preset adjustment coefficient di, i = 1, 2, 3, 4, and the adjusted blending ratio A0*bi*ci*di is taken as the first-time adjusted blending ratio A1.

[0093] As can be seen, this embodiment obtains the ash melting characteristics of economic coal, including softening temperature T1 and melting temperature T2. When the softening temperature T1 and melting temperature T2 are low, the coal is prone to coking during combustion in the boiler. Therefore, in this embodiment, the preset blending ratio A0 is adjusted by selecting the corresponding adjustment coefficient based on the softening temperature T1 and melting temperature T2. When the softening temperature T1 or melting temperature T2 is low, the blending ratio of economic coal in all coal types is reduced to avoid coking due to ash melting of the coal entering the furnace, thereby reducing boiler operating efficiency, lowering costs, and ensuring boiler operating safety.

[0094] Specifically, when making a second adjustment to the first-adjusted blending ratio A1, the following steps are included:

[0095] Obtain the primary air fan outlet air volume M0 and the flue gas temperature T3;

[0096] The first preset primary air outlet air volume M1, the second preset primary air outlet air volume M2, the third preset primary air outlet air volume M3, and the fourth preset primary air outlet air volume M4 are preset, and M1 < M2 < M3 < M4; the first preset adjustment coefficient m1, the second preset adjustment coefficient m2, the third preset adjustment coefficient m3, and the fourth preset adjustment coefficient m4 are preset, and 0.9 < m1 < m2 < 1 < m3 < m4 < 1.1;

[0097] When M1≤T3<M2, the first preset adjustment coefficient m1 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m1;

[0098] When M2≤T3<M3, the second preset adjustment coefficient m2 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m2;

[0099] When M3≤T3<M4, the fourth preset adjustment coefficient m3 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m3;

[0100] When M4≤T3, the fourth preset adjustment coefficient m4 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3*m4.

[0101] Specifically, after selecting the i-th preset adjustment coefficient mi to adjust the exhaust gas temperature T3, i = 1, 2, 3, 4, and obtaining the adjusted exhaust gas temperature T3*mi, the process further includes:

[0102] The first preset smoke exhaust temperature value N1, the second preset smoke exhaust temperature value N2, the third preset smoke exhaust temperature value N3, and the fourth preset smoke exhaust temperature value N4 are preset, and N1 < N2 < N3 < N4; the first preset correction coefficient n1, the second preset correction coefficient n2, the third preset correction coefficient n3, and the fourth preset correction coefficient n4 are preset, and 0.9 < n4 < n3 < 1 < n2 < n1 < 1.1;

[0103] When N1≤T3*mi<N2, the first preset correction coefficient n1 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n1;

[0104] When N2≤T3*mi<N3, the second preset correction coefficient n2 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n2;

[0105] When N3≤T3*mi<N4, the third preset correction coefficient n3 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n3;

[0106] When N4≤T3*mi<N2, the fourth preset correction coefficient n4 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1*n4;

[0107] The first-adjusted blending ratio A1 is adjusted a second time by selecting the i-th preset correction coefficient ni, i = 1, 2, 3, 4, and the adjusted first-adjusted blending ratio A1*ni is taken as the final blending ratio A2.

[0108] As can be seen, in this embodiment, the primary air fan outlet air volume M0 and flue gas temperature T3 inside the boiler are obtained when coal is burned according to the first-stage adjusted blending ratio A1. The flue gas temperature T3 is adjusted by selecting the corresponding adjustment coefficient mi based on the primary air fan outlet air volume M0. Then, the first-stage adjusted blending ratio A1 is adjusted a second time by selecting the corresponding correction coefficient ni based on the adjusted flue gas temperature T3*mi, resulting in the final blending ratio A2. Since a decrease in the primary air fan outlet air volume during boiler operation leads to an increase in flue gas temperature, the obtained flue gas temperature T3 is adjusted when the primary air fan outlet air volume is low to reduce the flue gas temperature value and eliminate the influence of the primary air fan outlet air volume on the flue gas temperature. Simultaneously, excessively high flue gas temperature is detrimental to the recovery and utilization of waste heat in the flue gas. Furthermore, waste heat recovery and utilization are achieved through the water film in the economizer, and excessively high flue gas temperature can cause the water film in the economizer to vaporize, thus affecting the safe operation of the boiler. Excessively high moisture content in the coal also leads to an increase in flue gas temperature. Therefore, in this embodiment, the blending ratio A1 is adjusted a second time by obtaining the adjusted flue gas temperature T3*mi. When the flue gas temperature is too high, the blending ratio of economic coal in all coal types is reduced again to further ensure the safe operation of the boiler.

[0109] See Figure 2 As shown, this embodiment provides a system for adjusting the blending amount of different coal types, including:

[0110] The information acquisition module is used to acquire the moisture content and ash melting characteristics of economic coal types.

[0111] An information storage module is used to store information from the information acquisition module;

[0112] The information processing module presets the blending ratio AO of economic coal type to all coal types, extracts information from the information storage module to adjust A0, and determines the final blending ratio A2 of economic coal type to all coal types.

[0113] Specifically, the step of extracting information from the information storage module to adjust A0 further includes:

[0114] The blending ratio is adjusted once based on the moisture value and ash melting characteristics of the economic coal type to obtain an adjusted blending ratio A1.

[0115] The combustion data obtained during combustion based on the first adjusted blending ratio A1 is used to make a second adjustment to obtain the final blending ratio A2.

[0116] Specifically, the ash melting characteristic values ​​include softening temperature and melting temperature, and the combustion data include exhaust gas temperature and primary air fan outlet air volume.

[0117] As can be seen, the system for adjusting the blending amount of different coal types in this embodiment adjusts the preset blending ratio of economic coal types to all coal types by obtaining the moisture value and ash melting characteristic value of economic coal types. When the moisture value and ash melting characteristic value of economic coal types are within the preset adjustment range, the preset blending ratio is adjusted by the adjustment coefficient to avoid the exhaust gas temperature from rising due to excessive moisture of coal types entering the furnace, which would lead to a decrease in boiler thermal efficiency. At the same time, it avoids the risk of boiler coking due to the low ash melting point of economic coal types, which would pose a hidden danger to the safe operation of the boiler.

[0118] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0119] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0120] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0121] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method of adjusting the amount of blending of different coal types, characterized by, include: The preset blending ratio of economic coal types to all coal types is AO; Obtain the moisture content and ash fusion characteristics of economical coal types; Based on the moisture value and ash melting characteristics of the economic coal type, the corresponding adjustment coefficient is selected to adjust the blending ratio once, resulting in an adjusted blending ratio A1. By acquiring combustion data during combustion based on the first adjusted blending ratio A1, selecting the corresponding correction coefficient, and performing a second adjustment on the first adjusted blending ratio A1, the final blending ratio A2 is obtained. The ash melting characteristic values ​​obtained include softening temperature and melting temperature, and the combustion data include exhaust gas temperature and primary air fan outlet air volume; The adjustment includes: Obtain the moisture value B0 of the economic coal type; pre-set a first preset moisture value B1, a second preset moisture value B2, a third preset moisture value B3, and a fourth preset moisture value B4, where B1 < B2 < B3 < B4; pre-set a first adjustment coefficient b1, a second preset adjustment coefficient b2, a third preset adjustment coefficient b3, and a fourth preset adjustment coefficient b4, where 1 > b1 > b2 > b3 > b4 > 0.9; When B1≤B0<B2, the first preset adjustment coefficient b1 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0×b1; When B2≤B0<B3, the second preset adjustment coefficient b2 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0×b2; When B3≤B0<B4, the third preset adjustment coefficient b3 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0×b3; When B4≤B0, the fourth preset adjustment coefficient b4 is selected to adjust the preset blending ratio A0, and the adjusted blending ratio is A0×b4; After selecting the i-th preset adjustment coefficient bi to adjust the preset blending ratio A0, i=1, 2, 3, 4, and obtaining the adjusted blending ratio A0×bi, the process further includes: Obtain the softening temperature value T1; A first preset softening temperature value C1, a second preset softening temperature value C2, a third preset softening temperature value C3, and a fourth preset softening temperature value C4 are preset, and C1 < C2 < C3 < C4; a first preset adjustment coefficient c1, a second preset adjustment coefficient c2, a third preset adjustment coefficient c3, and a fourth preset adjustment coefficient c4 are preset, and 0.9 < c1 < c2 < 1 < c3 < c4 < 1.1; When C1≤T1<C2, the first preset adjustment coefficient c1 is selected to adjust the adjusted blending ratio A0×bi again, and the adjusted blending ratio is A0×bi×c1; When C2≤T1<C3, the second preset adjustment coefficient c2 is selected to adjust the adjusted blending ratio A0×bi again, and the adjusted blending ratio is A0×bi×c2; When C3≤T1<C4, the third preset adjustment coefficient c3 is selected to adjust the adjusted blending ratio A0×bi again, and the adjusted blending ratio is A0×bi×c3; When C4≤T1, the fourth preset adjustment coefficient c4 is selected to adjust the adjusted blending ratio A0×bi again, and the adjusted blending ratio is A0×bi×c4. After selecting the i-th preset adjustment coefficient ci to adjust the blending ratio A0×bi, i=1, 2, 3, 4, and obtaining the adjusted blending ratio A0×bi×ci, the process further includes: Obtain the melting temperature value T2; A first preset melting temperature value D1, a second preset melting temperature value D2, a third preset melting temperature value D3, and a fourth preset melting temperature value D4 are preset, and D1 < D2 < D3 < D4; a first preset adjustment coefficient d1, a second preset adjustment coefficient d2, a third preset adjustment coefficient d3, and a fourth preset adjustment coefficient d4 are preset, and 0.9 < d1 < d2 < 1 < d3 < d4 < 1.1; When D1≤T2<D2, the first preset adjustment coefficient d1 is selected to adjust the adjusted blending ratio A0×bi×ci again, and the adjusted blending ratio is A0×bi×ci×d1; When D2≤T2<D3, the second preset adjustment coefficient d2 is selected to adjust the adjusted blending ratio A0×bi×ci again, and the adjusted blending ratio is A0×bi×ci×d2; When D3≤T2<D4, the third preset adjustment coefficient d3 is selected to adjust the adjusted blending ratio A0×bi×ci again, and the adjusted blending ratio is A0×bi×ci×d3; When D4≤T2, the fourth preset adjustment coefficient d4 is selected to adjust the adjusted blending ratio A0×bi×ci again, and the adjusted blending ratio is A0×bi×ci×d4; The adjusted blending ratio A0×bi×ci is adjusted by selecting the i-th preset adjustment coefficient di, i=1,2,3,4, and the adjusted blending ratio A0×bi×ci×di is taken as the first adjustment blending ratio A1; When making a second adjustment to the blending ratio A1 after the first adjustment, the following steps are included: Obtain the primary air fan outlet air volume M0 and the flue gas temperature T3; The first preset primary air outlet air volume M1, the second preset primary air outlet air volume M2, the third preset primary air outlet air volume M3, and the fourth preset primary air outlet air volume M4 are preset, and M1 < M2 < M3 < M4; the first preset adjustment coefficient m1, the second preset adjustment coefficient m2, the third preset adjustment coefficient m3, and the fourth preset adjustment coefficient m4 are preset, and 0.9 < m1 < m2 < 1 < m3 < m4 < 1.1; When M1≤T3<M2, the first preset adjustment coefficient m1 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3×m1; When M2≤T3<M3, the second preset adjustment coefficient m2 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3×m2; When M3≤T3<M4, the fourth preset adjustment coefficient m3 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3×m3; When M4≤T3, the fourth preset adjustment coefficient m4 is selected to adjust the exhaust temperature T3, and the adjusted exhaust temperature is T3×m4.

2. The method for adjusting the blending amount of different coal types according to claim 1, characterized in that, After selecting the i-th preset adjustment coefficient mi to adjust the exhaust gas temperature T3, i=1, 2, 3, 4, and obtaining the adjusted exhaust gas temperature T3×mi, the process further includes: The first preset smoke exhaust temperature value N1, the second preset smoke exhaust temperature value N2, the third preset smoke exhaust temperature value N3, and the fourth preset smoke exhaust temperature value N4 are preset, and N1 < N2 < N3 < N4; the first preset correction coefficient n1, the second preset correction coefficient n2, the third preset correction coefficient n3, and the fourth preset correction coefficient n4 are preset, and 0.9 < n4 < n3 < 1 < n2 < n1 < 1.1; When N1≤T3×mi<N2, the first preset correction coefficient n1 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1×n1; When N2≤T3×mi<N3, the second preset correction coefficient n2 is selected to perform a second adjustment on the first adjustment blending ratio A1, and the first adjustment blending ratio of 6 after adjustment is A1×n2; When N3≤T3×mi<N4, the third preset correction coefficient n3 is selected to perform a second adjustment on the first adjustment blending ratio A1, and the adjusted first adjustment blending ratio is A1×n3; When N4≤T3×mi<N2, the fourth preset correction coefficient n4 is selected to perform a second adjustment on the first-adjusted blending ratio A1, and the adjusted first-adjusted blending ratio is A1×n4; The first-adjusted blending ratio A1 is adjusted a second time by selecting the i-th preset correction coefficient ni, i=1, 2, 3, 4, and the adjusted first-adjusted blending ratio A1×ni is taken as the final blending ratio A2.

3. A system for adjusting the blending amount of different coal types, applied to the method for adjusting the blending amount of different coal types as described in any one of claims 1-2, characterized in that, The system includes: The information acquisition module is used to acquire the moisture content and ash melting characteristics of economic coal types. An information storage module is used to store information from the information acquisition module; The information processing module presets the blending ratio AO of economic coal type to all coal types, extracts information from the information storage module to adjust A0, and determines the final blending ratio A2 of economic coal type to all coal types.

4. The system for adjusting the blending amount of different coal types according to claim 3, wherein, The step of extracting information from the information storage module to adjust A0 also includes: The blending ratio is adjusted once based on the moisture value and ash melting characteristics of the economic coal type to obtain an adjusted blending ratio A1. The combustion data obtained during combustion based on the first adjusted blending ratio A1 is used to make a second adjustment to obtain the final blending ratio A2.

5. The system for adjusting the blending amount of different coal types according to claim 4, wherein, The ash melting characteristic values ​​include softening temperature and melting temperature, and the combustion data include exhaust gas temperature and primary air fan outlet air volume.

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