Novel burner pulverized coal concentration adjusting and controlling device

Abstract

The invention provides novel combustor pulverized coal concentration adjusting and controlling equipment, and relates to the technical field of thermal power generation, the novel combustor pulverized coal concentration adjusting and controlling equipment comprises a plurality of groups of coal conveying pipelines, two ends of each coal conveying pipeline are respectively communicated with a coal mill and a combustor, and an air pressure control assembly is arranged on the inlet side of each coal conveying pipeline and is used for introducing air with pressure into the coal conveying pipeline; the air pressure control assembly is communicated with an external pressurized air source, and a concentration compensation assembly is arranged on the outlet side of the coal conveying pipeline. The air pressure control assembly is arranged at the inlet of each coal conveying pipeline, the air pressure of the coal conveying pipelines is adjusted, so that the conveying resistance of different coal conveying pipelines is balanced, the distribution uniformity of pulverized coal is improved, then the concentration compensation assembly is arranged on the outlet side of each coal conveying pipeline, the concentration of the pulverized coal is compensated, and the distribution uniformity of the pulverized coal is improved. Therefore, the accuracy of the concentration of pulverized coal finally output by the coal conveying pipeline is improved, and the combustion effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generation, and in particular to a novel burner coal powder concentration regulating and controlling device. Background Art

[0002] In the process of generating electricity, the boiler usually generates thermal power by burning coal. In the process of burning coal, in order to ensure the full combustion of coal, the coal is usually ground into powder for combustion. In the process of transporting the coal powder from the pulverizing system to the burner, due to the different routes and lengths of each pipeline to each layer of burners, the distribution of coal powder concentration in the coal transportation pipeline becomes uneven, which in turn affects the combustion effect of the burner on the coal. Summary of the invention

[0003] The present invention provides a novel burner coal powder concentration regulating and controlling device, which is used to solve the defect in the prior art that the coal powder concentration is unevenly distributed in the coal conveying pipeline due to the different routes and lengths of each pipeline to each layer of burners, thereby affecting the combustion effect of the burner on the coal.

[0004] On the one hand, the present invention provides a new type of burner coal powder concentration adjustment and control equipment, including several groups of coal pipelines, the two ends of the coal pipelines are respectively connected to the coal mill and the burner, an air pressure control component is arranged on the inlet side of the coal pipeline, the air pressure control component is used to introduce pressurized air into the coal pipeline, the air pressure control component is connected to the external pressurized air source, and a concentration compensation component is arranged on the outlet side of the coal pipeline.

[0005] Preferably, the concentration compensation component includes a mixing chamber, which is arranged on the coal conveying pipeline. A first concentration sensor is arranged at the inlet and outlet of the mixing chamber. The mixing chamber is also connected to a compensation coal pipe, the feed port of the compensation coal pipe is connected to the discharge port of the coal mill, and a coal powder concentration regulating valve is installed on the compensation coal pipe.

[0006] Preferably, it also includes an operation control system, which includes:

[0007] A standard value generation module is used to generate a monitoring standard value for coal powder concentration;

[0008] An air pressure control module, used to control the air pressure input to the air pressure control component;

[0009] The concentration monitoring module is used to monitor whether the coal powder concentration in each group of coal transportation pipelines meets the requirements.

[0010] Preferably, the standard value generation module generates the monitoring standard value of the coal powder concentration of each coal transportation pipeline based on the following formula:

[0011] Among them, C iis the monitoring standard value of the coal powder concentration of the i-th coal pipeline; A s is the actual air-fuel ratio used by the burner corresponding to the i-th coal pipeline; A b is the optimal air-fuel ratio; || is the absolute value symbol; Q is the heat required by the burner per unit time; η is the average combustion efficiency of the burner; V si is the air input flow rate of the i-th group of coal pipelines; H is the calorific value of the coal used; D s is the actual particle size of coal powder; D b is the reference value of the particle size of coal powder; ln is the logarithmic function with e as the base; e is a natural constant; T s is the actual input air temperature; T b is the optimal input air temperature; M i is the total number of coal inlets of the burners to which the i-th group of coal pipelines belongs; τ i is the burner type calculation coefficient corresponding to the i-th group of coal pipelines; θ i is the injection angle of the i-th group of coal pipelines; θ b For the best spray angle.

[0012] Preferably, the air pressure control module comprises:

[0013] A basic air pressure generating unit, used for generating a basic required air pressure based on a monitoring standard value of coal powder concentration;

[0014] P bi =αC i ; Among them, P bi is the basic required air pressure of the i-th group of coal transportation pipelines; α is the air pressure conversion coefficient; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline;

[0015] An actual gas pressure generating unit, used to generate the actual required gas pressure of each group of coal transportation pipelines;

[0016] P i =σ i P bi ; Among them, P i is the actual required gas pressure of the i-th group of coal pipelines; σ i is the gas pressure adjustment coefficient of the i-th group of coal pipelines; P bi is the basic required gas pressure of the i-th group of coal pipelines;

[0017] The regulation coefficient correction unit is used to regularly correct the gas pressure regulation coefficient of each group of coal transportation pipelines.

[0018] Preferably, the adjustment coefficient correction unit includes:

[0019] Deviation evaluation subunit, used to calculate the operation deviation parameters of each group of coal pipelines;

[0020] Among them, R i is the operation deviation parameter of the i-th group of coal pipelines; C i2 is the average coal powder concentration at the inlet of the mixing chamber of the i-th group of coal pipelines; C i is the monitoring standard value of the coal powder concentration of the i-th coal pipeline; || is the absolute value symbol;

[0021] A parameter correction subunit, used to correct the gas pressure adjustment coefficient of the coal pipeline whose operation deviation parameter is greater than a preset first threshold value;

[0022] Among them, σ ix is the corrected gas pressure adjustment coefficient of the i-th group of coal pipelines; σ is is the gas pressure adjustment coefficient of the i-th group of coal pipelines before correction; C i2 is the average coal powder concentration at the inlet of the mixing chamber of the i-th group of coal pipelines; C i is the monitoring standard value of coal powder concentration in the i-th coal pipeline.

[0023] Preferably, the concentration monitoring module includes:

[0024] An abnormality monitoring unit, used for abnormality monitoring of the coal powder conveying process;

[0025] A concentration compensation unit, used to compensate for the concentration of pulverized coal in the mixing chamber;

[0026] The uniformity evaluation unit is used to calculate the uniformity evaluation parameters of the coal powder concentration entering each burner and determine the safety of the burner.

[0027] Preferably, the abnormality monitoring unit comprises:

[0028] A second concentration sensor is provided at the inlet of the coal conveying pipeline and is used to detect the coal powder concentration at the inlet of the coal conveying pipeline;

[0029] The loss abnormality monitoring subunit is used to calculate the coal powder transportation loss rate;

[0030] Among them, E i is the coal powder transportation loss rate of the i-th group of coal transportation pipelines; C i1s is the real-time coal powder concentration at the inlet of the coal pipeline of the i-th group of coal pipelines; C i2s is the real-time coal powder concentration at the inlet of the mixing chamber of the i-th group of coal conveying pipelines;

[0031] When the coal powder conveying loss rate is greater than a preset second threshold, an alarm is issued;

[0032] Output abnormality monitoring subunit, used to calculate the output difference rate of coal powder concentration;

[0033] Among them, U i is the output difference rate of the i-th group of coal pipelines; C i1s is the real-time coal powder concentration at the inlet of the coal pipeline of the i-th group of coal pipelines; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline;

[0034] When the output difference rate of coal powder concentration is greater than the preset third threshold, an alarm is issued.

[0035] Preferably, the concentration compensation unit comprises:

[0036] The compensation judgment subunit is used to calculate the compensation judgment parameters of each group of coal transportation pipelines and judge whether coal powder concentration compensation is required;

[0037] Among them, N i is the compensation judgment parameter of the i-th group of coal pipelines; C i2 is the average coal powder concentration at the inlet of the mixing chamber of the i-th group of coal pipelines; C i is the monitoring standard value of the coal powder concentration of the i-th coal pipeline; C b is the preset minimum compensation concentration;

[0038] When the compensation judgment parameter of a group of coal transportation pipelines is less than 1, the group of coal transportation pipelines does not need to be compensated for the pulverized coal concentration; otherwise, the group of coal transportation pipelines needs to be compensated for the pulverized coal concentration;

[0039] A compensation supply amount calculation subunit is used to calculate the target pulverized coal concentration of the compensation coal pipe;

[0040] Among them, C iq is the target pulverized coal concentration of the compensation coal pipe corresponding to the i-th group of coal pipelines; C i is the monitoring standard value of the coal powder concentration of the i-th coal pipeline; C i2s is the real-time coal powder concentration at the inlet of the mixing chamber of the i-th group of coal pipelines; i is the average coal powder concentration loss rate of the i-th group of coal transportation pipelines;

[0041] The parameter adjustment subunit is used to adjust the pulverized coal concentration regulating valve so that the pulverized coal concentration in the compensation coal pipe reaches the corresponding target pulverized coal concentration.

[0042] Preferably, the uniformity evaluation unit calculates the uniformity evaluation parameter of the coal powder concentration entering the burner based on the following formula:

[0043] Among them, Wj M is the uniformity evaluation parameter of coal powder concentration entering the jth burner; j is the total number of coal inlets of the jth burner; C k is the concentration of pulverized coal entering the kth coal inlet;

[0044] When the uniformity of the concentration of coal powder entering the burner is greater than the preset fourth threshold, it is considered that there is a safety hazard in the burner and an alarm is issued.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] By setting an air pressure control component at the inlet of each coal pipeline and adjusting the air pressure of the coal pipeline, the transportation resistance of different coal pipelines is balanced, thereby improving the uniformity of coal powder distribution. Then, by setting a concentration compensation component on the outlet side of the coal pipeline, the coal powder concentration is compensated, thereby improving the accuracy of the coal powder concentration finally output by the coal pipeline, improving the combustion effect, and at the same time reducing the difference in coal powder concentration between different coal inlets of the burner, improving the combustion uniformity inside the burner, and further improving the combustion effect of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 It is a structural schematic diagram of the present invention.

[0049] Reference numerals:

[0050] 1. Coal transportation pipeline; 2. Coal pulverizer; 3. Burner; 4. Air pressure control component; 5. Concentration compensation component; 501. Mixing chamber; 502. Compensation coal pipe; 503. Coal powder concentration regulating valve. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0052] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] Example 1

[0054] The embodiment of the present invention provides a new type of coal powder concentration adjustment and control device for a burner 3, comprising a plurality of groups of coal conveying pipelines 1, wherein the two ends of the coal conveying pipelines 1 are respectively connected to a coal mill 2 and a burner 3, and an air pressure control component 4 is arranged on the inlet side of the coal conveying pipeline 1, and the air pressure control component 4 is used to introduce pressurized air into the coal conveying pipeline 1, and the air pressure control component 4 is connected to an external pressurized air source, and a concentration compensation component 5 is arranged on the outlet side of the coal conveying pipeline 1.

[0055] Preferably, the concentration compensation component 5 includes a mixing chamber 501, which is arranged on the coal conveying pipeline 1. The first concentration sensor is arranged at the inlet and outlet of the mixing chamber 501. The mixing chamber 501 is also connected to a compensation coal pipe 502. The feed port of the compensation coal pipe 502 is connected to the discharge port of the pulverizer 2. The compensation coal pipe 502 is installed with a coal powder concentration regulating valve 503.

[0056] In this embodiment, the pulverized coal concentration regulating valve 503 is a prior art, such as a pulverized coal concentration regulating valve 503 disclosed in CN221922055U.

[0057] In this embodiment, the air pressure control component 4 is an air pipe.

[0058] The beneficial effects of the above technical solution are:

[0059] By setting an air pressure control component 4 at the inlet of each coal conveying pipeline 1 and adjusting the air pressure of the coal conveying pipeline 1, the conveying resistance of different coal conveying pipelines 1 is balanced, thereby improving the uniformity of coal powder distribution. Then, by setting a concentration compensation component 5 on the outlet side of the coal conveying pipeline 1, the coal powder concentration is compensated, thereby improving the accuracy of the coal powder concentration finally output by the coal conveying pipeline 1, improving the combustion effect, and at the same time reducing the difference in coal powder concentration between different coal inlets of the burner 3, improving the combustion uniformity inside the burner 3, and further improving the combustion effect of the burner 3.

[0060] Example 2

[0061] On the basis of embodiment 1, it also includes an operation control system, and the operation control system includes:

[0062] A standard value generation module is used to generate a monitoring standard value for coal powder concentration;

[0063] An air pressure control module, used to control the air pressure input to the air pressure control component 4;

[0064] The concentration monitoring module is used to monitor whether the coal powder concentration in each group of coal conveying pipelines 1 meets the requirements.

[0065] Preferably, the standard value generation module generates the monitoring standard value of the coal powder concentration of each coal transportation pipeline 1 based on the following formula:

[0066] Among them, C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline 1; A s A is the actual air-fuel ratio used by the burner 3 corresponding to the i-th coal pipeline 1; b is the optimal air-fuel ratio; || is the absolute value symbol; Q is the heat required per unit time by burner 3; η is the average combustion efficiency of burner 3; V si is the air input flow rate of the i-th coal pipeline 1; H is the calorific value of the coal used; D s is the actual particle size of coal powder; D b is the reference value of the particle size of coal powder; ln is the logarithmic function with e as the base; e is a natural constant; T s is the actual input air temperature; T b is the optimal input air temperature; M i is the total number of coal inlets of the burners 3 to which the i-th group of coal conveying pipelines 1 belongs; τ i is the burner type calculation coefficient corresponding to the i-th group of coal pipeline 1; θ i is the injection angle of the i-th group of coal conveying pipeline 1; θ b For the best spray angle.

[0067] In this embodiment, the burner type calculation coefficient refers to a coal powder concentration calculation coefficient determined according to the type of the burner 3 , and the burner type calculation coefficient is a preset value corresponding to the type of the burner 3 .

[0068] The beneficial effects of the above technical solution are:

[0069] By generating a monitoring standard value of the coal powder concentration of each coal pipeline 1 according to the combustion demand and combustion conditions of the burner 3, a control benchmark is provided for adjusting the coal powder concentration of the burner 3, thereby improving the adaptability of the coal powder concentration to the combustion conditions, which is beneficial to improving the combustion effect of the burner 3.

[0070] When calculating the detection standard value of coal powder concentration, firstly, the combustion demand of burner 3 is used, and then the The theoretical value of the coal powder concentration requirement of the coal transportation pipeline 1 is calculated, and then the theoretical value of the coal powder concentration requirement is corrected by considering the type of burner 3, the injection angle of the coal transportation pipeline 1, the air inlet temperature, the actual air-fuel ratio and the actual particle size of the coal powder, so as to obtain the actual detection standard value of the coal powder concentration, so that the detection standard value of the coal powder concentration is more adapted to the combustion requirement and actual combustion conditions of the burner 3, thereby improving the accuracy of the coal powder concentration requirement, and then improving the accuracy of the coal powder concentration control, and finally improving the combustion effect of the burner 3.

[0071] Example 3

[0072] Based on Example 2, the air pressure control module includes:

[0073] A basic air pressure generating unit, used for generating a basic required air pressure based on a monitoring standard value of coal powder concentration;

[0074] P bi =αC i ; Among them, P bi is the basic required air pressure of the i-th coal transportation pipeline 1; α is the air pressure conversion coefficient; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline 1;

[0075] An actual air pressure generating unit, used to generate an actual required air pressure for each group of coal transportation pipelines 1;

[0076] P i =σ i P bi ; Among them, P i is the actual required gas pressure of the i-th coal transportation pipeline 1; σ i is the gas pressure adjustment coefficient of the i-th group of coal pipeline 1; P bi is the basic required gas pressure of the i-th group of coal pipeline 1;

[0077] The regulation coefficient correction unit is used to regularly correct the gas pressure regulation coefficient of each group of coal transportation pipelines 1.

[0078] Preferably, the adjustment coefficient correction unit includes:

[0079] a deviation evaluation subunit, for calculating the operation deviation parameters of each group of coal transportation pipelines 1;

[0080] Among them, R i is the operation deviation parameter of the i-th group of coal pipeline 1; C i2 is the average coal powder concentration at the inlet of the mixing chamber 501 of the i-th group of coal conveying pipelines 1; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline 1; || is the absolute value symbol;

[0081] A parameter correction subunit, used to correct the gas pressure adjustment coefficient of the coal transportation pipeline 1 whose operation deviation parameter is greater than a preset first threshold value;

[0082] Among them, σ ix is the corrected gas pressure adjustment coefficient of the i-th coal transportation pipeline 1; σ is is the gas pressure adjustment coefficient of the i-th coal pipeline 1 before correction; C i2 is the average coal powder concentration at the inlet of the mixing chamber 501 of the i-th group of coal conveying pipelines 1; C i is the monitoring standard value of the coal powder concentration in the i-th coal transportation pipeline 1.

[0083] In this embodiment, the pressure conversion coefficient is a conversion coefficient for determining the required pressure in the coal transportation pipeline 1 according to the coal powder concentration, and the unit is Pa·m 3 / g, the air pressure conversion coefficient is an empirical value obtained by summarizing the historical coal transportation data and the corresponding actual air pressure values.

[0084] In this embodiment, the air pressure adjustment coefficient is a correction coefficient used to correct the basic required air pressure to the actual required air pressure of each group of coal pipelines 1, which is determined according to the size of the transportation resistance of each group of coal pipelines 1. The air pressure adjustment coefficient is obtained based on the analysis of historical data.

[0085] The beneficial effects of the above technical solution are:

[0086] The basic required air pressure is generated based on the required value of the coal powder concentration, and then the basic required air pressure is corrected according to the transportation resistance of each group of coal pipelines 1, thereby achieving the balance of the transportation resistance of multiple coal pipelines 1, thereby improving the control accuracy of the coal powder concentration inside the coal pipeline 1, and thereby improving the combustion effect of the burner 3. The air pressure adjustment coefficient of the coal pipeline 1 is corrected regularly, thereby improving the accuracy of the air pressure adjustment coefficient of the coal pipeline 1. By monitoring the operation deviation parameters of the coal pipeline 1, it is determined whether the air pressure adjustment coefficient of the coal pipeline 1 needs to be adjusted, thereby ensuring that the air pressure adjustment coefficient of the coal pipeline 1 with high accuracy is retained, and at the same time, the air pressure adjustment coefficient of the coal pipeline 1 with insufficient accuracy is corrected, thereby improving the accuracy of the air pressure adjustment coefficient. The air pressure adjustment coefficient is corrected regularly, thereby avoiding the increase in the difference between the air pressure adjustment coefficient of the coal pipeline 1 and the actual corresponding situation as the use time of the coal pipeline 1 increases, resulting in a decrease in the accuracy of the coal powder concentration control.

[0087] Example 4

[0088] Based on any one of embodiments 1-3, the concentration monitoring module includes:

[0089] An abnormality monitoring unit, used for abnormality monitoring of the coal powder conveying process;

[0090] A concentration compensation unit, used to compensate for the concentration of pulverized coal in the mixing chamber 501;

[0091] The uniformity evaluation unit is used to calculate the uniformity evaluation parameters of the coal powder concentration entering each burner 3 and determine the safety of the burner 3.

[0092] Preferably, the abnormality monitoring unit comprises:

[0093] The second concentration sensor is arranged at the inlet of the coal conveying pipeline 1 and is used to detect the coal powder concentration at the inlet of the coal conveying pipeline 1;

[0094] The loss abnormality monitoring subunit is used to calculate the coal powder transportation loss rate;

[0095] Among them, E i is the coal powder transportation loss rate of the i-th group of coal transportation pipeline 1; C i1s is the real-time coal powder concentration at the inlet of the coal pipeline 1 of the i-th group of coal pipelines 1; C i2s is the real-time coal powder concentration at the inlet of the mixing chamber 501 of the i-th group of coal conveying pipelines 1;

[0096] When the coal powder conveying loss rate is greater than a preset second threshold, an alarm is issued;

[0097] Output abnormality monitoring subunit, used to calculate the output difference rate of coal powder concentration;

[0098] Among them, U i is the output difference rate of the i-th group of coal pipeline 1; C i1s is the real-time coal powder concentration at the inlet of the coal pipeline 1 of the i-th group of coal pipelines 1; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline 1;

[0099] When the output difference rate of coal powder concentration is greater than the preset third threshold, an alarm is issued.

[0100] Preferably, the concentration compensation unit comprises:

[0101] The compensation judgment subunit is used to calculate the compensation judgment parameters of each group of coal conveying pipelines 1 and judge whether coal powder concentration compensation is required;

[0102] Among them, N i is the compensation judgment parameter of the i-th group of coal transportation pipeline 1; C i2 is the average coal powder concentration at the inlet of the mixing chamber 501 of the i-th group of coal conveying pipelines 1; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline 1; C b is the preset minimum compensation concentration;

[0103] When the compensation judgment parameter of a group of coal transportation pipelines 1 is less than 1, the group of coal transportation pipelines 1 does not need to be compensated for the coal powder concentration, otherwise the group of coal transportation pipelines 1 needs to be compensated for the coal powder concentration;

[0104] A compensation supply amount calculation subunit, used to calculate the target pulverized coal concentration of the compensation coal pipe 502;

[0105] Among them, C iq is the target coal powder concentration of the compensation coal pipe 502 corresponding to the i-th group of coal transportation pipelines 1; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline 1; C i2s is the real-time coal powder concentration at the inlet of the mixing chamber 501 of the i-th group of coal conveying pipelines 1; δ i is the average coal powder concentration loss rate of the i-th group of coal transportation pipelines 1;

[0106] The parameter adjustment subunit is used to adjust the pulverized coal concentration regulating valve 503 so that the pulverized coal concentration in the compensation coal pipe 502 reaches the corresponding target pulverized coal concentration.

[0107] Preferably, the uniformity evaluation unit calculates the uniformity evaluation parameter of the coal powder concentration entering the burner 3 based on the following formula:

[0108] Among them, Wj M is the uniformity evaluation parameter of the coal powder concentration entering the jth burner 3; j is the total number of coal inlets of the jth burner 3; C k is the concentration of pulverized coal entering the kth coal inlet;

[0109] When the uniformity of the coal powder concentration entering the burner 3 is greater than a preset fourth threshold, it is considered that there is a safety hazard in the burner 3 and an alarm is issued.

[0110] In this embodiment, the minimum compensation concentration refers to the minimum coal powder concentration compensation amount that can produce a stable compensation effect when performing coal powder concentration compensation.

[0111] In this embodiment, the coal powder concentration loss rate refers to the degree of reduction in coal powder concentration caused by the coal powder being transported from the inlet of the coal transportation pipeline 1 to the outlet of the coal transportation pipeline 1 .

[0112] The beneficial effects of the above technical solution are:

[0113] By monitoring the coal powder transportation loss rate and the output difference rate of coal powder concentration, it is ensured that the output accuracy of the coal powder concentration in the coal transportation pipeline 1 and the loss rate of the transportation process are within a reasonable range, thereby ensuring that the coal powder concentration adjustment and control device is in normal operation. When an abnormality occurs, the staff is reminded to carry out maintenance in time through an alarm, thereby ensuring the timely elimination of the fault and avoiding the incorrect correction of operating parameters due to structural failure, which affects the operating stability of the coal powder concentration adjustment and control equipment.

[0114] By calculating the compensation judgment parameter of the coal transportation pipeline 1, it is determined whether coal powder concentration compensation is required, so as to avoid increasing the deviation rate and volatility of coal powder concentration and affecting the stability of coal powder concentration by performing coal powder concentration compensation when it is not necessary.

[0115] By evaluating the uniformity of the coal powder concentration entering each burner 3, it is ensured that the coal powder concentrations at different coal inlets on the burner 3 are in a similar state, thereby ensuring that the combustion inside the burner 3 is relatively uniform, thereby improving the combustion effect of the burner 3. When the difference in the coal powder concentration entering the furnace is too large, the alarm is used to remind the staff to carry out maintenance in time, thereby avoiding uneven combustion inside the burner 3, ensuring the stability of the combustion effect of the burner 3, and at the same time helping to extend the service life of the burner 3.

[0116] 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 new type of burner coal powder concentration adjustment control device, characterized in that: The invention comprises a plurality of groups of coal conveying pipelines (1), the two ends of the coal conveying pipelines (1) are respectively connected to a coal mill (2) and a burner (3), an air pressure control component (4) is arranged on the inlet side of the coal conveying pipeline (1), the air pressure control component (4) is used to introduce pressurized air into the coal conveying pipeline (1), the air pressure control component (4) is connected to an external pressurized air source, and a concentration compensation component (5) is arranged on the outlet side of the coal conveying pipeline (1).

2. A new type of burner coal powder concentration adjustment control device according to claim 1, characterized in that: The concentration compensation component (5) comprises a mixing chamber (501), the mixing chamber (501) being arranged on the coal conveying pipeline (1), a first concentration sensor being arranged at the inlet and outlet of the mixing chamber (501), a compensation coal pipe (502) being connected to the mixing chamber (501), a feed inlet of the compensation coal pipe (502) being connected to a feed outlet of the coal mill (2), and a coal powder concentration regulating valve (503) being installed on the compensation coal pipe (502).

3. A new type of burner coal powder concentration adjustment control device according to claim 2, characterized in that: It also includes an operation control system, which includes: A standard value generation module is used to generate a monitoring standard value for coal powder concentration; An air pressure control module, used for controlling the air pressure input to the air pressure control component (4); The concentration monitoring module is used to monitor whether the coal powder concentration in each group of coal conveying pipelines (1) meets the requirements.

4. A new type of burner coal powder concentration adjustment control device according to claim 3, characterized in that: The standard value generation module generates the monitoring standard value of the coal powder concentration of each coal transportation pipeline (1) based on the following formula: Among them, C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline (1); A s A is the air-fuel ratio actually used by the burner (3) corresponding to the i-th coal pipeline (1); b is the optimal air-fuel ratio; || is the absolute value symbol; Q is the heat required per unit time by the burner (3); η is the average combustion efficiency of the burner (3); V si is the air input flow rate of the i-th group of coal pipelines (1); H is the calorific value of the coal used; D s is the actual particle size of coal powder; D b is the reference value of the particle size of coal powder; ln is the logarithmic function with e as the base; e is a natural constant; T s is the actual input air temperature; T b is the optimal input air temperature; M i is the total number of coal inlets of the burner (3) to which the i-th group of coal conveying pipelines (1) belongs; τ i is the burner type calculation coefficient corresponding to the i-th group of coal pipelines (1); θ i is the injection angle of the i-th group of coal conveying pipelines (1); θ b For the best spray angle.

5. A new type of burner coal powder concentration adjustment control device according to claim 3, characterized in that: The air pressure control module includes: A basic air pressure generating unit, used for generating a basic required air pressure based on a monitoring standard value of coal powder concentration; P bi =αC i ; Among them, P bi is the basic required air pressure of the i-th group of coal transportation pipelines (1); α is the air pressure conversion coefficient; C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline (1); An actual air pressure generating unit, used to generate an actual required air pressure for each group of coal transportation pipelines (1); P i =σ i P bi ; Among them, P i is the actual required gas pressure of the i-th group of coal pipelines (1); σ i is the gas pressure regulation coefficient of the i-th group of coal pipelines (1); bi is the basic required gas pressure of the i-th group of coal pipelines (1); The regulation coefficient correction unit is used to regularly correct the gas pressure regulation coefficient of each group of coal conveying pipelines (1).

6. A new type of burner coal powder concentration adjustment control device according to claim 5, characterized in that: The adjustment coefficient correction unit includes: A deviation evaluation subunit, used for calculating the operation deviation parameters of each group of coal pipelines (1); Among them, R i is the operation deviation parameter of the i-th group of coal pipelines (1); C i2 is the average coal powder concentration at the inlet of the mixing chamber (501) of the i-th group of coal conveying pipelines (1); C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline (1); || is the absolute value symbol; A parameter correction subunit, used for correcting the gas pressure adjustment coefficient of the coal transportation pipeline (1) whose operation deviation parameter is greater than a preset first threshold value; Among them, σ ix is the corrected gas pressure adjustment coefficient of the i-th coal pipeline (1); σ is is the gas pressure adjustment coefficient of the i-th coal pipeline (1) before correction; C i2 is the average coal powder concentration at the inlet of the mixing chamber (501) of the i-th group of coal conveying pipelines (1); C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline (1).

7. A new type of burner coal powder concentration adjustment control device according to claim 3, characterized in that: The concentration monitoring module includes: An abnormality monitoring unit, used for abnormality monitoring of the coal powder conveying process; A concentration compensation unit, used for compensating the concentration of pulverized coal in the mixing chamber (501); The uniformity evaluation unit is used to calculate the uniformity evaluation parameter of the coal powder concentration entering each burner (3) and to judge the use safety of the burner (3).

8. A new type of burner coal powder concentration adjustment control device according to claim 7, characterized in that: The abnormal monitoring unit includes: A second concentration sensor is arranged at the inlet of the coal conveying pipeline (1) and is used to detect the concentration of coal powder at the inlet of the coal conveying pipeline (1); The loss abnormality monitoring subunit is used to calculate the coal powder transportation loss rate; Among them, E i is the coal powder transportation loss rate of the i-th group of coal transportation pipelines (1); C i1s is the real-time coal powder concentration at the inlet of the coal conveying pipeline (1) of the i-th group of coal conveying pipelines (1); C i2s is the real-time coal powder concentration at the inlet of the mixing chamber (501) of the i-th group of coal conveying pipelines (1); When the coal powder conveying loss rate is greater than a preset second threshold, an alarm is issued; Output abnormality monitoring subunit, used to calculate the output difference rate of coal powder concentration; Among them, U i is the output difference rate of the i-th group of coal pipelines (1); C i1s is the real-time coal powder concentration at the inlet of the coal conveying pipeline (1) of the i-th group of coal conveying pipelines (1); C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline (1); When the output difference rate of coal powder concentration is greater than the preset third threshold, an alarm is issued.

9. A new type of burner coal powder concentration adjustment control device according to claim 7, characterized in that: The concentration compensation unit includes: A compensation judgment subunit, used to calculate the compensation judgment parameter of each group of coal conveying pipelines (1) and judge whether coal powder concentration compensation is required; Among them, N i is the compensation judgment parameter of the i-th group of coal transportation pipelines (1); C i2 is the average coal powder concentration at the inlet of the mixing chamber (501) of the i-th group of coal conveying pipelines (1); C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline (1); C b is the preset minimum compensation concentration; When the compensation judgment parameter of a group of coal conveying pipelines (1) is less than 1, the group of coal conveying pipelines (1) does not need to be compensated for the coal powder concentration; otherwise, the group of coal conveying pipelines (1) needs to be compensated for the coal powder concentration; A compensation supply amount calculation subunit, used to calculate a target pulverized coal concentration of the compensation coal pipe (502); Among them, C iq is the target coal powder concentration of the compensation coal pipe (502) corresponding to the i-th group of coal transportation pipelines (1); C i is the monitoring standard value of the coal powder concentration of the i-th coal transportation pipeline (1); C i2s is the real-time coal powder concentration at the inlet of the mixing chamber (501) of the i-th group of coal conveying pipelines (1); δ i is the average coal powder concentration loss rate of the i-th group of coal transportation pipelines (1); The parameter adjustment subunit is used to adjust the coal powder concentration adjustment valve (503) so that the coal powder concentration in the compensation coal pipe (502) reaches the corresponding target coal powder concentration.

10. A new type of burner coal powder concentration adjustment control device according to claim 7, characterized in that: The uniformity evaluation unit calculates the uniformity evaluation parameter of the coal powder concentration entering the burner (3) based on the following formula: Among them, W j M is the uniformity evaluation parameter of the coal powder concentration entering the j-th burner (3); j is the total number of coal inlets of the jth burner (3); C k is the concentration of pulverized coal entering the kth coal inlet; When the uniformity of the concentration of coal powder entering the burner (3) is greater than a preset fourth threshold value, it is considered that there is a safety hazard in the burner (3) and an alarm is issued.

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