CN104724479A - System and method for blending power heat coal - Google Patents

Abstract

The invention discloses a system and a method for blending power heat coal. The system comprises a raw coal conveyor, K raw coal blending branches, a mixed coal conveyor, coal mixing equipment and a finished coal bunker or yard. A type of raw coal can be blended by each raw coal blending branch, each raw coal blending branch comprises a raw coal bunker, a discharge outlet/hopper of the raw coal bunker and a raw coal speed regulation conveyor; each raw coal blending branch further comprises a heat coal blending device, and each heat coal blending device is used for measuring heat values Q<adi coal k> and weights W<i coal k> of the raw coal, computing values J<i coal k>, regulating the conveying speeds of the corresponding raw coal speed regulation conveyor according to the values J<i coal k> and reducing the values J< J<i coal k>, so that the values J<i coal k> are approximately equal to values J<control coal k> and meet an equation of J<i coal k>=J<control coal k>-J<i coal k>, and values J<i coal k> meet an equation of J<i coal k>=Q<adi coal k>*W<i coal k>. The system and the method have the advantage that heat coal blending closed-loop control and heat value closed-loop control can be implemented on the premise that raw coal flow ratios of the various raw coal blending branches are guaranteed.

Description

A kind of power heat Coal Blending System and method thereof

Technical field

The present invention relates to dynamic blending coals, particularly by power heat Coal Blending System and the method thereof of the coal blending of each feed coal heat.

Background technology

Rich coal resources in China, the place of production is extensive, the main provinces and cities throughout the whole nation, and ature of coal is quite complicated, and difference is very large, and user is various in addition, as electric boiler, Industrial Boiler, coal tar, cement kiln etc.How to utilize the coal resources of the different ature of coal in each place of production, can meet again the respective requirement of variant user, be the vital task that dynamic blending coals will solve.

Dynamic blending coals is according to the requirement of user to ature of coal, by some variety classeses, coal of different nature, mix in constant weight ratio and join the new coal of the one processed (thermal coal), namely utilize various coal in qualitative difference, learn from other's strong points to offset one's weaknesses, mix and be made into the thermal coal that bulk properties reaches optimum state, to meet the needs of user.In existing Coal Blending Technology, have by coal blending mode: storehouse is mixing, bed is mixing, it is mixing to be with; Have by coal blending process: underground coal blending process and simple storehouse formula coal blending process, wherein more with the application of simple storehouse formula.

Figure 1 shows that simple storehouse of the prior art formula Coal Blending System forms schematic diagram.This system comprises feed coal conveyer 1, belt plow 2-k, K feed coal coal blending branch road m1-mK(each feed coal coal blending branch road comprises feed coal feed bin 3-k, spiral scraper feeder 4-k, feed coal speed governing conveyer 5-k and belted electronic balance 6-k), mixed coal conveyer 7, mixed coal equipment 8 and thermal coal feed bin 9(or stock ground).

Each feed coal is delivered to belt plow 2-k by feed coal conveyer 1, under its corresponding control, each feed coal is dispensed to corresponding each feed coal feed bin 3-k to store, feed coal, through respective spiral scraper feeder 4-k, is delivered to corresponding feed coal speed governing conveyer 5-k and weighs through belted electronic balance 6-k by the feed coal that during coal blending, each feed coal feed bin 3-k stores.Linked by respective spiral scraper feeder 4-k and belted electronic balance 6-k and reach accurate flow control, realize coal blending by weight proportion.

The feed coal that respective feed coal speed governing conveyer 5-k carries, delivers to mixed coal equipment 8 through mixed coal conveyer 7 and carries out mixing and uniformization, then deliver to thermal coal feed bin 9(or stock ground).

Existing dynamic blending coals Problems existing has:

1) user is to thermal coal coal quality requirements mainly ature of coal heat stable (cal val is stablized), the ature of coal quality (amount of heat) of each feed coal is stablized directly related with the heat of thermal coal, and existing dynamic blending coals system is coal blending by weight proportion, in coal blending process, it does not connect with the ature of coal quality of each feed coal, although off-line measurement can be done to each feed coal ature of coal parameter, in order to regulate the weight of each feed coal, but because Measuring Time is long, can not accomplish in time according to the timely regulating weight of feed coal coal varitation.Each feed coal coal varitation, affects thermal coal ature of coal stability.

2) existing dynamic blending coals system, in coal blending process, does not realize (cal val) on-line measurement of thermal coal ature of coal and control, thus can not better guarantee that the calorific value of coal of thermal coal is stablized.

For existing dynamic blending coals system Problems existing, the invention discloses a kind of power heat Coal Blending System, it can meet the requirement of each feed coal by constant weight ratio, can carry out carrying out coal blending by the heat of each feed coal according to the coal varitation of each feed coal again, in addition, this heat Coal Blending System in coal blending process, can also realize the on-line measurement of thermal coal cal val and control, reaches the stable of the ature of coal quality improving thermal coal.

Summary of the invention

The technical matters that the present invention solves is, realizes by the requirement of each feed coal part by weight, presses heat coal supply according to each feed coal ature of coal quality.

Further, the present invention in coal blending process, can also realize the on-line measurement of thermal coal cal val and control.

For solving the problem, the invention discloses a kind of power heat Coal Blending System, join thermal coal for mixing, this system comprises:

K feed coal coal blending branch road, K be more than or equal to 2 natural number, each feed coal coal blending branch road is mixed and is joined a kind of feed coal, and each feed coal coal blending branch road comprises: feed coal feed bin, feed coal feed bin discharge hole/feed coal feed bin hopper, feed coal speed governing conveyer;

Mixed coal conveyer, for the feed coal carrying this K feed coal coal blending branch road to export;

Mixed coal equipment, for various the mixing of feed coal exported by this mixed coal conveyer;

Thermal coal feed bin or stock ground, for storing the thermal coal that this mixed coal equipment exports;

This feed coal coal blending branch road each also comprises a heat coal-blending device, for carrying out cal val Q to the feed coal on the feed coal speed governing conveyer in place feed coal coal blending branch road _{adi coal k}with weight W _{i coal k}measure, and calculate Δ J _{i coal k}, according to Δ J _{i coal k}regulate the delivery speed of this feed coal speed governing conveyer to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}, make J _{i coal k}with J _{control coal k}be close, realize each feed coal coal blending branch road by heat coal blending;

Wherein, Δ J _{i coal k}=J _{control coal k}-J _{i coal k}, J _{i coal k}=Q _{adi coal k}× W _{i coal k};

This J _{i coal k}for the heat of the feed coal on the feed coal speed governing conveyer in a kth feed coal coal blending branch road, J _{control coal k}for the control calorie value of the feed coal in a kth feed coal coal blending branch road, J _{control coal k}=P _k× Q _{ad dynamic}, Q _{ad moves}for the rated thermal amount of thermal coal, P _kflow for the feed coal in a kth feed coal coal blending branch road accounts for the flow proportional of all feed coals.

This system also comprises: data processing controller, for receiving the heat J of the feed coal from this K feed coal coal blending branch road _{i coal k}with weight W _{i coal k}, and calculate Δ Q _{adi moves}, according to this Δ Q _{adi moves}revise J _{control coal k}, obtain J _{control coal k}', by this J _{control coal k}' be sent to heat coal-blending device in a kth feed coal coal blending branch road, make it according to this by J _{control coal k}' carry out heat coal blending, to reduce Δ Q _{adi moves}, make Q _{ad moves}with Q _{adi moves}be close, realize cal val On-line Control, wherein,

Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}

J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves})

N and m is the data acquisition number of times of this heat coal-blending device, n>m, gathers formerly for this n time, after being captured in for this m time, represent the m secondary data sum in rear collection in a kth feed coal coal blending branch road, represent the m data deducted formerly in n the data that in a kth feed coal coal blending branch road, heat coal-blending device first gathers to sue for peace again, K _qfor calibration coefficient, J _{control coal k}' be the control calorie value of the revised feed coal in a kth feed coal coal blending branch road, Q _{ad moves}for thermal coal rated thermal amount, Q _{adi moves}for the thermal coal cal val measured.

This heat coal-blending device comprises further:

Cal val on-line measurement instrument, for measuring the cal val Q of feed coal _{adi coal k};

Weight-measuring device, for measuring the weight W of feed coal _{i coal k};

Data acquisition controller, for receiving Q _{adi coal k}, W _{i coal k}and J _{control coal k}', calculate Δ J _{i coal k}',

Δ J _{i coal k}'=J _{control coal k}'-J _{i coal k}, J _{i coal k}=Q _{adi coal k}× W _{i coal k};

This data acquisition controller is according to this Δ J _{i coal k}' signal is sent to this feed coal buncher, to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}', reach J _{i coal k}with J _{control coal k}' be close, realize pressing heat coal blending.

This cal val on-line measurement instrument is X-ray cal val on-line measurement instrument or gamma radiation cal val on-line measurement instrument;

This weight-measuring device is belted electronic balance or X-ray scale, or gravimetric feeder.

Described system also comprises a cal val on-line measurement instrument, is arranged on above this mixed coal conveyer, for the thermal coal cal val Q of thermal coal carried this mixed coal conveyer _{adi moves}measure;

This data processing controller calculates Δ Q _{adi moves}, Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}, and revise the control calorie value J of each feed coal accordingly _{control coal k}, obtain J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves});

This data processing controller is by this J _{control coal k}' send to heat coal-blending device in corresponding feed coal coal blending branch road, each heat coal-blending device is by respective J _{control coal k}' carry out heat coal blending, reduce difference DELTA Q _{adi moves}, to make Q _{adi moves}with specified Q _{ad moves}be close, realize cal val On-line Control.

The invention also discloses a kind of power heat blending method, comprising:

Step 101, utilizes K feed coal coal blending branch road to carry K kind feed coal respectively, utilizes the heat coal-blending device in each feed coal coal blending branch road to measure the cal val Q of often kind of feed coal _{adi coal k}with weight W _{i coal k};

Step 102, utilizes the heat coal-blending device in each feed coal coal blending branch road to calculate the heat J of feed coal _{i coal k}, wherein, J _{i coal k}=Q _{adi coal k}× W _{i coal k};

Step 103, calculates Δ J _{i coal k}, Δ J _{i coal k}=J _{control coal k}-J _{i coal k}, J _{control coal k}for the control calorie value of the feed coal in a kth feed coal coal blending branch road, J _{control coal k}=P _k× Q _{ad moves}, Q _{ad moves}for the rated thermal amount of thermal coal, P _kfor the feed coal flow in a kth feed coal coal blending branch road accounts for the flow proportional of all feed coals;

Step 104, according to Δ J _{i coal k}regulate the delivery speed of the feed coal speed governing conveyer in feed coal coal blending branch road to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}, make J _{i coal k}with J _{control coal k}be close, realize each feed coal by heat coal blending.

A data processing controller is utilized to receive the heat J of the feed coal from this K feed coal coal blending branch road respectively _{i coal k}with weight W _{i coal k}, and calculate Δ Q _{adi moves}, according to this Δ Q _{adi moves}revise respective J _{control coal k}, obtain J _{control coal k}', by this J _{control coal k}' being sent to heat coal-blending device in a kth feed coal coal blending branch road, heat coal-blending device is according to J _{control coal k}' carry out coal blending, to reduce Δ Q _{adi moves}, make Q _{ad moves}with Q _{adi moves}be close, realize cal val On-line Control, wherein,

Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}

J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves})

N and m is the data acquisition number of times of this heat coal-blending device, n>m, gathers formerly for this n time, after being captured in for this m time, represent the m secondary data sum in rear collection in a kth feed coal coal blending branch road, represent the m data that n data that in a kth feed coal coal blending branch road, heat coal-blending device first gathers to deduct in this n data formerly to sue for peace again, K _qfor calibration coefficient, J _{control coal k}' be the control calorie value of the revised feed coal in a kth feed coal coal blending branch road, Q _{ad moves}for thermal coal rated thermal amount, Q _{adi moves}for the thermal coal cal val measured.

N=T2/T1, m=T3/T1, T1 are the heat coal blending regulable control time, and T2 is the mixed coal time, and T3 is the cal val regulable control time.

The data acquisition controller of this heat coal-blending device receives Q _{adi coal k}, W _{i coal k}and J _{control coal k}', calculate Δ J _{i coal k}',

Δ J _{i coal k}'=J _{control coal k}'-J _{i coal k};

This data acquisition controller is according to this Δ J _{i coal k}' signal is sent to this feed coal buncher, to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}', reach J _{i coal k}with J _{control coal k}' be close, realize pressing heat coal blending.

Measure the thermal coal cal val Q of the thermal coal of mixed coal conveyer conveying _{adi moves};

This data processing controller calculates Δ Q _{adi moves}, Δ Q _{adi moves}=Q _{ad moves}-Q _adidynamic, and revise the control calorie value J of each feed coal accordingly _{control coal k}, obtain J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves});

This data processing controller is by this J _{control coal k}' send to heat coal-blending device in corresponding feed coal coal blending branch road, each heat coal-blending device is by respective J _{control coal k}' carry out heat coal blending, reduce difference DELTA Q _{adi moves}, to make Q _{adi moves}with specified Q _{ad moves}be close, realize cal val On-line Control.

The present invention is under the prerequisite of feed coal throughput ratio ensureing each feed coal coal blending branch road, heat coal blending and the closed loop control of thermal coal cal val can be realized according to each feed coal ature of coal quality simultaneously, realize the coal blending of power heat, improve resource utilization, reduce energy resource consumption, improve heat efficiency.

Accompanying drawing explanation

Figure 1 shows that simple storehouse of the prior art formula Coal Blending System forms schematic diagram.

Fig. 2,4 is depicted as the structural representation of power heat Coal Blending System of the present invention.

Figure 3 shows that the structural representation of heat coal-blending device AK of the present invention.

Fig. 5 gives the power heat Coal Blending System control flow schematic diagram of invention.

Detailed description of the invention

The present invention on the basis of existing technology, is provided with heat coal-blending device A further in each dynamic blending coals branch road _k(A ₁, A ₂... A _k), meanwhile, belted electronic balance 6-k of the prior art is no longer set.Shown in Figure 2 is the structural representation of power heat Coal Blending System of the present invention.Be illustrated in figure 3 heat coal-blending device A _kstructural representation.

This heat coal-blending device A _kcomprise cal val on-line measurement instrument 103 further, for measuring the cal val Q of the feed coal on feed coal speed governing conveyer 5-k _{adi coal k}; Also comprise weight-measuring device 104, for measuring the weight W of the feed coal on feed coal speed governing conveyer 5-k _{i coal k}; Also comprise data acquisition controller 105.

Below this heat coal-blending device A is specifically introduced _kworking process, each heat coal-blending device A _kworking process all identical.

In order to ensure that power heat Coal Blending System by the requirement of each feed coal part by weight and can meet user to the requirement of thermal coal cal val, the rated thermal amount Q of thermal coal first need be set _{ad moves}.Secondly, according to the coal character of each feed coal, select kind and the coal number K of feed coal.According to high-quality high price coal use less, the principle that coal is multiplex at a low price inferior, setting P _k, k=2 ..., K, P _kfor the feed coal flow in a kth feed coal coal blending branch road accounts for the flow proportional of all feed coals.

According to Q _{ad moves}and P ₁, P ₂p _kcan determine that the feed coal of various feed coal controls calorie value J _{control coal k}.

Wherein, J _{control coal 1}=P ₁× Q _{ad moves},

J _{control coal 2}=P2 × Q _{ad moves}

J _{control coal K}=P _k× Q _{ad moves}

Data acquisition controller 105 in a kth feed coal coal blending branch road records the cal val Q of the feed coal in this branch road according to the cal val on-line measurement instrument 103 in this branch road _{adi coal k}, and the weight W that weight-measuring device 104 records _{i coal k}, calculate Δ J _{i coal k}, this data acquisition controller 105 is according to Δ J _{i coal k}regulate the delivery speed of the feed coal speed governing conveyer 5-k in this branch road to increase or to reduce the weight W of the feed coal carried _{i coal k}, and then reduce Δ J _{i coal k}, make J _{i coal k}with J _{control coal k}be close, realize pressing heat coal blending;

Wherein, Δ J _{i coal k}=J _{control coal k}-J _{i coal k}(1)

J _{i coal k}=Q _{adi coal k}× W _{i coal k}(2)

This J _{i coal k}for the heat of the feed coal on the feed coal speed governing conveyer that records in a kth feed coal coal blending branch road.

Specifically, Δ J _{i coal k}/ Q _{adi coal k}=Δ W _{i coal k}, this data acquisition controller 105 can according to Δ W _{i coal k}regulate the coal-supplying amount of feed coal speed governing conveyer 5-k, increase or reduce W _{i coal k}, to reduce Δ J _{i coal k}, make the J of each feed coal _{i coal k}with respective control calorie value J _{control coal k}be close, realize pressing J _{control coal k}heat coal blending is carried out in requirement.

Further arrange a data processing controller B, this data processing controller B receives the heat J from K feed coal coal blending branch road feed coal separately _{i coal k}with weight W _{i coal k}, and revised feed coal control calorie value J is sent to each branch road _{control coal k}'.

Data processing controller B, according to each feed coal coal blending branch road, calculates respectively value and value.

Wherein, n and m is this heat coal-blending device A _kthe times of collection of DATA REASONING, n>m, gathers formerly for this n time, after being captured in for this m time, represent the J corresponding to the m secondary data of rear collection in a kth feed coal coal blending branch road _{i coal k}accumulated value, represent the m data that n data that in a kth feed coal coal blending branch road, heat coal-blending device first gathers to deduct in this n data formerly to sue for peace again.

Wherein, n=T2/T1, m=T3/T1, T1 are heat coal blending regulable control time (every T ₁time heat coal blending is once), T2 is mixed coal time (mixed coal equipment homogenising time), and T3 is cal val regulable control time (every T3 time is to cal val regulable control once).

Subsequently, data processing controller B calculates thermal coal cal val Q _{adi moves}.

K _qfor calibration coefficient.

Wherein, K _q=Q _{ad marks}/ Q _{ad surveys}

Q _{ad marks}thermal coal coal sample is taked, the calorific value that off-line measurement coal sample obtains for measuring in the t time, and Q _{ad surveys}for its formula (3) in the measurement t time is at K _qthe thermal coal calorific value that when=1, measurement obtains.

Subsequently, data processing controller B calculates Δ Q _{adi moves}.

Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}

Data processing controller B is according to Δ Q _{adi moves}revise the J of each feed coal coal blending branch road _{control coal k}.

J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves})

J _{control coal k}' be the control calorie value of the revised feed coal in a kth feed coal coal blending branch road.

Data processing controller B is by J _{control coal k}' be sent to a kth feed coal coal blending branch road, corresponding heat coal-blending device A _kdata acquisition controller 105, data acquisition controller 105 is by the control calorie value J of revised feed coal _{control coal k}' carry out heat coal supply.

This cal val on-line measurement instrument 103 is X-ray cal val on-line measurement instrument or gamma radiation cal val on-line measurement instrument; This weight-measuring device 104 is belted electronic balance or X-ray scale, or gravimetric feeder.

Further, as shown in Figure 4, above mixed coal conveyer 7, another cal val on-line measurement instrument 11 is also provided with, for measuring the thermal coal cal val Q of this mixed coal conveyer 7 conveying _{adi moves}, and by this thermal coal cal val Q _{adi moves}be sent to this data processing controller B.

This data processing controller B calculates Δ Q accordingly _{adi moves}, Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}, and revise the former control calorie value J of each feed coal accordingly _{control coal k}, obtain J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves}).

This data processing controller B is by this J _{control coal k}' send to heat coal-blending device A in a corresponding kth feed coal coal blending branch road _k, the heat coal-blending device A of this kth feed coal coal blending branch road _kdata acquisition controller 105 by this J _{control coal k}' carry out heat coal blending, reduce difference DELTA Q _{adi moves}, to make Q _{adi moves}with specified Q _{ad moves}be close, realize cal val On-line Control.

Corresponding with above-mentioned power heat Coal Blending System, the invention also discloses a kind of power heat blending method, comprising:

Step 101, utilizes K feed coal coal blending branch road to mix respectively and joins K kind feed coal, utilizes the heat coal-blending device in each feed coal coal blending branch road to measure the cal val Q of often kind of feed coal _{adi coal k}with weight W _{i coal k};

Step 102, utilizes the heat coal-blending device A in each feed coal coal blending branch road _kcalculate the heat J of each feed coal _{i coal k}, wherein, J _{i coal k}=Q _{adi coal k}× W _{i coal k};

Step 103, calculates Δ J _{i coal k}, Δ J _{i coal k}=J _{control coal k}-J _{i coal k}, J _{control coal k}for the control calorie value of the feed coal in a kth feed coal coal blending branch road, J _{control coal k}=P _k× Q _{ad moves}, Q _{ad moves}for the rated thermal amount of thermal coal, P _kfor the feed coal flow in a kth feed coal coal blending branch road accounts for the flow proportional of all feed coal flows;

Step 104, according to Δ J _{i coal k}regulate the delivery speed of the feed coal speed governing conveyer in feed coal coal blending branch road to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}, make J _{i coal k}with J _{control coal k}be close, realize pressing heat coal blending.

The method also can comprise:

Step 105, utilizes a data processing controller to receive the heat J of the feed coal from this K feed coal coal blending branch road respectively _{i coal k}with weight W _{i coal k}, and calculate Δ Q _{adi moves}, according to this Δ Q _adidynamic correction J _{control coal k}, obtain J _{control coal k}', by this J _{control coal k}' being sent to heat coal-blending device in a kth feed coal coal blending branch road, this heat coal-blending device is according to J _{control coal k}' carry out heat coal blending, to reduce Δ Q _{adi moves}, make Q _{ad moves}with Q _{adi moves}be close, realize cal val On-line Control, wherein,

Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}

J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves})

N and m is the data acquisition number of times of this heat coal-blending device, n>m, gathers formerly for this n time, after being captured in for this m time, represent the m secondary data sum in rear collection in a kth feed coal coal blending branch road, represent the m data that n data that in a kth feed coal coal blending branch road, heat coal-blending device first gathers to deduct in this n data formerly to sue for peace again, K _qfor calibration coefficient, J _{control coal k}' be the control calorie value of the revised feed coal in a kth feed coal coal blending branch road, Q _{ad moves}for thermal coal rated thermal amount, Q _{adi moves}for the thermal coal cal val measured.

The method also can comprise:

Step 106, the data acquisition controller 105 of this heat coal-blending device receives Q _{adi coal k}, W _{i coal k}and J _{control coal k}', calculate Δ J _{i coal k}',

Δ J _{i coal k}'=J _{control coal k}'-J _{i coal k};

This data acquisition controller is according to this Δ J _{i coal k}' signal is sent to this feed coal buncher, to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}', reach J _{i coal k}with J _{control coal k}' be close, realize pressing heat coal blending.

The method also can comprise:

Step 107, measures thermal coal cal val Q _{adi moves};

This data processing controller calculates Δ Q _{adi moves}, Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}, and revise the former control calorie value J of each feed coal accordingly _{control coal k}, obtain J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves});

This data processing controller is by this J _{control coal k}' send to heat coal-blending device in corresponding feed coal coal blending branch road, each heat coal-blending device is by respective J _{control coal k}' carry out heat coal blending, reduce difference DELTA Q _{adi moves}, to make Q _{adi moves}with specified Q _{ad moves}be close, realize cal val On-line Control.

The present invention, under the prerequisite of throughput ratio ensureing each feed coal coal blending branch road, can realize closed loop control and the cal val closed loop control of heat coal blending simultaneously, realizes pressing heat coal supply.

Fig. 5 gives the power heat Coal Blending System control flow schematic diagram of invention.

This control flow comprises heat coal blending closed loop control and cal val closed loop control.

Power heat Coal Blending System is compared with existing dynamic blending coals system, and its difference technical characteristic is as follows:

1. the control calorie value J of each feed coal _{control coal}by each feed coal flow proportional (P ₁, P ₂, ┄ P _k) require and user requirement thermal coal rated thermal amount Q _{ad moves}determine.Each heat coal-blending device is by respective J _{control coal}carry out heat coal blending;

2. set n and m image data number, achieve, by cal val math modeling, on-line measurement is carried out to thermal coal cal val, obtain Q _{adi moves};

3. according to Q _{ad moves}with Q _{adi moves}difference DELTA Q _{adi moves}, revise the respective feed coal heat controlling valu J of each heat coal-blending device _{control coal k}, obtain J _{control coal k}', respective heat coal-blending device is by respective J _{control coal k}' carry out heat coal blending, to reduce Δ Q _{adi moves}, realize the on-line measurement of thermal coal cal val and control.

From above feature, be not difficult to find out, the present invention's more existing dynamic blending coals system has obvious technological advance, the energy can be made full use of again, and can be user special quality thermal coal is provided, thus also bring larger economic benefit to user, as electric power thermal coal can reduce the thermal fluctuation of coal dust, reduce boiler coke, improve heat efficiency.

Below provide instantiation to be described.

1) each feed coal coal character, ature of coal parameter and variation range thereof and user is joined to the requirement of thermal coal cal val, as rated thermal amount Q according to mixing _{ad moves}for 22.36MJ/Kg, the old ditch pit coal in selected Datong District, land owned by officials, Shanxi pit coal, Luan Jingge village coal (hereinafter referred to as Datong District, Shanxi, Jing Gezhuan) three coals of opening a mine participate in coal blending, K=3 accordingly;

2) ature of coal of three kinds of feed coals is measured, obtain Q _{ad Datong District}=25.62MJ/Kg, variation range 3%, Q _{ad Shanxi}=26.39MJ/Kg, variation range 5%; Q _{the ad Jing Ge village}=16.99MJ/Kg, variation range 5%;

3) meeting under user requires prerequisite, with few with high-quality high price coal, multiplex cheap coal inferior is principle, determines that each feed coal flow proportional is P _{1 Datong District}=35%, P _{2 Shanxi}=25%, P _{the 3 Jing Ge village}=40%, require that total coal blending flow is 200T/h, then P ₁=70T/h, P ₂=50T/h, P ₃=80T/h.

4) the control calorie value J of each feed coal is determined _{control coal}:

J _{kong Mei Datong District}=P ₁* Q _{ad moves}(70t*1000kg/3600 second) * 22.36MJ/Kg=434MJ/ second

J _{control coal Shanxi}=P ₂* Q _{ad moves}(50t*1000kg/3600 second) * 22.36MJ/Kg=301.5MJ/ second

J _{the Kong Meijingge village}=P ₃* Q _{ad moves}(80t*1000kg/3600 second) * 22.36MJ/Kg=496.9MJ/ second

5) Blending Parameter of heat coal-blending device is determined

Acquisition time Δ t=0.1 second

Coal blending heat regulation period T1=1 second

Mixed coal time T2=3 minute needed for mixed coal equipment

Thermal coal cal val regulable control time T3=10 second

According to above calculation of parameter go out to gather number n=T2/T1=180 second/1 second=180 times,

M=T3/T1=10 second/1 second=10 times

6) each heat coal-blending device (A ₁, A ₂, A ₃) measure cal val and the weight of respective feed coal respectively:

Q _{adi coal Datong District}w _{i coal Datong District}

Q _{adi coal Shanxi}w _{i coal Shanxi}

Q _{the adi Mei Jingge village}w _{the i Mei Jingge village}

7) each heat coal-blending device A _kcalculate the heat J of each feed coal _{i coal k}, and with control calorie value J separately _{control coal k}difference:

J _{i coal Datong District}=Q _{adi coal Datong District}× W _{i coal Datong District}Δ J _{i coal Datong District}=J _{kong Mei Datong District}-J _{i coal Datong District}

J _{i coal Shanxi}=Q _{adi coal Shanxi}× _wi _{coal Shanxi}Δ J _{i coal Shanxi}=J _{control coal Shanxi}-J _{i coal Shanxi}

J _{the i Mei Jingge village}=Q _{the adi Mei Jingge village}× W _{the i Mei Jingge village}Δ J _{the i Mei Jingge village}=J _{the Kong Meijingge village}-J _{the i Mei Jingge village}

8) each heat coal-blending device A _kaccording to respective Δ J _{i coal k}conditioning signal is sent to respective feed coal speed governing conveyer, to increase or to reduce the weight ± Δ W of each feed coal _{i coal k}, draw:

W ' _{i coal Datong District}=W _{i coal Datong District}± Δ W _{i coal Datong District}

W ' _{i coal Shanxi}=W _{i coal Shanxi}± Δ W _{i coal Shanxi}

W ' _{the i Mei Jingge village}=W _{the i Mei Jingge village}± Δ W _{the i Mei Jingge village}

Thus reduce the Δ J of each feed coal _{i coal k}, reach J _{i coal Datong District}with J _{kong Mei Datong District}be close, J _{i coal Shanxi}with J _{control coal shanxi}be close, J _{the i Mei Jingge village}with J _{the Kong Meijingge village}the object be close, realizes carrying out coal blending by the heat of each feed coal.

9) data processing controller B is according to from each heat coal-blending device A _kheat and weight signal calculate respective

And move according to following calculated with mathematical model Qadi.

10) data processing controller calculates the Q of thermal coal _{adi moves}with Q _{ad moves}difference DELTA Q _{adi moves}=Q _{ad moves}-Q _{adi moves}, and according to Δ Q _adithe each heat coal-blending device A of dynamic correction _kcontrol calorie value J _{control coal k}, obtain J _{control coal k}'.

J _{kong Mei Datong District}'=P ₁(Q _{ad moves}± Δ Q _{adi moves})

J _{control coal Shanxi}'=P ₂(Q _{ad moves}± Δ Q _{adi moves})

J _{the Kong Meijingge village}'=P ₃(Q _{ad moves}± Δ Q _{adi moves})

11) data processing controller B is by respective J _{control coal k}' send to corresponding each heat coal-blending device, this heat coal-blending device is by respective J _{control coal k}' carry out heat coal blending, reduce Δ Q to reach _{adi moves}, make Q _{adi moves}with Q _{ad moves}be close, realize the On-line Control of thermal coal cal val.

12) coal property test is carried out to thermal coal.

Claims (10)

1. a power heat Coal Blending System, joins thermal coal for mixing, and this system comprises:

K feed coal coal blending branch road, K be more than or equal to 2 natural number, each feed coal coal blending branch road is mixed and is joined a kind of feed coal, and each feed coal coal blending branch road comprises: feed coal feed bin, feed coal feed bin discharge hole/feed coal feed bin hopper, feed coal speed governing conveyer;

Mixed coal conveyer, for the feed coal carrying this K feed coal coal blending branch road to export;

Mixed coal equipment, for various the mixing of feed coal exported by this mixed coal conveyer;

Thermal coal feed bin or stock ground, for storing the thermal coal that this mixed coal equipment exports;

It is characterized in that, this feed coal coal blending branch road each also comprises a heat coal-blending device, for carrying out cal val Q to the feed coal on the feed coal speed governing conveyer in place feed coal coal blending branch road _{adi coal k}with weight W _{i coal k}measure, and calculate Δ J _{i coal k}, according to Δ J _{i coal k}regulate the delivery speed of this feed coal speed governing conveyer to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}, make J _{i coal k}with J _{control coal k}be close, realize each feed coal coal blending branch road by heat coal blending;

Wherein, Δ J _{i coal k}=J _{control coal k}-J _{i coal k}, J _{i coal k}=Q _{adi coal k}× W _{i coal k};

This J _{i coal k}for the heat of the feed coal on the feed coal speed governing conveyer in a kth feed coal coal blending branch road, J _{control coal k}for the control calorie value of the feed coal in a kth feed coal coal blending branch road, J _{control coal k}=P _k× Q _{ad dynamic}, Q _{ad moves}for the rated thermal amount of thermal coal, P _kflow for the feed coal in a kth feed coal coal blending branch road accounts for the flow proportional of all feed coals.

2. the system as claimed in claim 1, is characterized in that, this system also comprises: data processing controller, for receiving the heat J of the feed coal from this K feed coal coal blending branch road _{i coal k}with weight W _{i coal k}, and calculate Δ Q _{adi moves}, according to this Δ Q _{adi moves}revise J _{control coal k}, obtain J _{control coal k}', by this J _{control coal k}' be sent to heat coal-blending device in a kth feed coal coal blending branch road, make it according to this by J _{control coal k}' carry out heat coal blending, to reduce Δ Q _{adi moves}, make Q _{ad moves}with Q _{adi moves}be close, realize cal val On-line Control, wherein,

Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}

J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves})

N and m is the data acquisition number of times of this heat coal-blending device, n>m, gathers formerly for this n time, after being captured in for this m time, represent the m secondary data sum in rear collection in a kth feed coal coal blending branch road, represent the m data deducted formerly in n the data that in a kth feed coal coal blending branch road, heat coal-blending device first gathers to sue for peace again, K _qfor calibration coefficient, J _{control coal k}' be the control calorie value of the revised feed coal in a kth feed coal coal blending branch road, Q _{ad moves}for thermal coal rated thermal amount, Q _{adi moves}for the thermal coal cal val measured.

3. system as claimed in claim 2, it is characterized in that, this heat coal-blending device comprises further:

Cal val on-line measurement instrument, for measuring the cal val Q of feed coal _{adi coal k};

Weight-measuring device, for measuring the weight W of feed coal _{i coal k};

Data acquisition controller, for receiving Q _{adi coal k}, W _{i coal k}and J _{control coal k}', calculate Δ J _{i coal k}',

Δ J _{i coal k}'=J _{control coal k}'-J _{i coal k}, J _{i coal k}=Q _{adi coal k}× W _{i coal k};

This data acquisition controller is according to this Δ J _{i coal k}' signal is sent to this feed coal buncher, to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}', reach J _{i coal k}with J _{control coal k}' be close, realize pressing heat coal blending.

4. system as claimed in claim 3, it is characterized in that, this cal val on-line measurement instrument is X-ray cal val on-line measurement instrument or gamma radiation cal val on-line measurement instrument;

This weight-measuring device is belted electronic balance or X-ray scale, or gravimetric feeder.

5. system as claimed in claim 2, is characterized in that, also comprise a cal val on-line measurement instrument, be arranged on above this mixed coal conveyer, for the thermal coal cal val Q of thermal coal carried this mixed coal conveyer _{adi moves}measure;

This data processing controller calculates Δ Q _{adi moves}, Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}, and revise the control calorie value J of each feed coal accordingly _{control coal k}, obtain J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves});

This data processing controller is by this J _{control coal k}' send to heat coal-blending device in corresponding feed coal coal blending branch road, each heat coal-blending device is by respective J _{control coal k}' carry out heat coal blending, reduce difference DELTA Q _{adi moves}, to make Q _{adi moves}with specified Q _{ad moves}be close, realize cal val On-line Control.

6. a power heat blending method, is characterized in that, comprising:

Step 101, utilizes K feed coal coal blending branch road to mix respectively and joins conveying K kind feed coal, utilize the heat coal-blending device in each feed coal coal blending branch road to measure the cal val Q of often kind of feed coal _{adi coal k}with weight W _{i coal k};

Step 102, utilizes the heat coal-blending device in each feed coal coal blending branch road to calculate the heat J of feed coal _{i coal k}, wherein, J _{i coal k}=Q _{adi coal k}× W _{i coal k};

Step 103, calculates Δ J _{i coal k}, Δ J _{i coal k}=J _{control coal k}-J _{i coal k}, J _{control coal k}for the control calorie value of the feed coal in a kth feed coal coal blending branch road, J _{control coal k}=P _k× Q _{ad moves}, Q _{ad moves}for the rated thermal amount of thermal coal, P _kfor the feed coal flow in a kth feed coal coal blending branch road accounts for the flow proportional of all feed coals;

Step 104, according to Δ J _{i coal k}regulate the delivery speed of the feed coal speed governing conveyer in feed coal coal blending branch road to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}, make J _{i coal k}with J _{control coal k}be close, realize each feed coal by heat coal blending.

7. method as claimed in claim 6, is characterized in that, also comprise:

A data processing controller is utilized to receive the heat J of the feed coal from this K feed coal coal blending branch road respectively _{i coal k}with weight W _{i coal k}, and calculate Δ Q _{adi moves}, according to this Δ Q _{adi moves}revise respective J _{control coal k}, obtain J _{control coal k}', by this J _{control coal k}' being sent to heat coal-blending device in a kth feed coal coal blending branch road, this heat coal-blending device is according to J _{control coal k}' carry out coal blending, to reduce Δ Q _{adi moves}, make Q _{ad moves}with Q _{adi moves}be close, realize cal val On-line Control, wherein,

Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}

J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves})

N and m is the data acquisition number of times of this heat coal-blending device, n>m, gathers formerly for this n time, after being captured in for this m time, represent the m secondary data sum in rear collection in a kth feed coal coal blending branch road, represent the m data that n data that in a kth feed coal coal blending branch road, heat coal-blending device first gathers to deduct in this n data formerly to sue for peace again, K _qfor calibration coefficient, J _{control coal k}' be the control calorie value of the revised feed coal in a kth feed coal coal blending branch road, Q _{ad moves}for thermal coal rated thermal amount, Q _{adi moves}for the thermal coal cal val measured.

8. method as claimed in claim 7, it is characterized in that, n=T2/T1, m=T3/T1, T1 are the heat coal blending regulable control time, and T2 is the mixed coal time, and T3 is the cal val regulable control time.

9. method as claimed in claim 7, is characterized in that, the data acquisition controller of this heat coal-blending device receives Q _{adi coal k}, W _{i coal k}and J _{control coal k}', calculate Δ J _{i coal k}',

Δ J _{i coal k}'=J _{control coal k}'-J _{i coal k};

This data acquisition controller is according to this Δ J _{i coal k}' signal is sent to this feed coal buncher, to increase or to reduce this weight W _{i coal k}, reduce Δ J _{i coal k}', reach J _{i coal k}with J _{control coal k}' be close, realize pressing heat coal blending.

10. method as claimed in claim 7, is characterized in that, also comprise:

Measure the thermal coal cal val Q of the thermal coal of mixed coal conveyer conveying _{adi moves};

This data processing controller calculates Δ Q _{adi moves}, Δ Q _{adi moves}=Q _{ad moves}-Q _{adi moves}, and revise the control calorie value J of each feed coal accordingly _{control coal k}, obtain J _{control coal k}'=P _k(Q _{ad moves}± Δ Q _{adi moves});

This data processing controller is by this J _{control coal k}' send to heat coal-blending device in corresponding feed coal coal blending branch road, each heat coal-blending device is by respective J _{control coal k}' carry out heat coal blending, reduce difference DELTA Q _{adi moves}, to make Q _{adi moves}with specified Q _{ad moves}be close, realize cal val On-line Control.