CN103920578A - Measurement method of coal mill entrance ventilation quantity - Google Patents
Measurement method of coal mill entrance ventilation quantity Download PDFInfo
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- CN103920578A CN103920578A CN201310012709.9A CN201310012709A CN103920578A CN 103920578 A CN103920578 A CN 103920578A CN 201310012709 A CN201310012709 A CN 201310012709A CN 103920578 A CN103920578 A CN 103920578A
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Abstract
The invention discloses a soft measurement method of the coal mill entrance ventilation quantity. The soft measurement method comprises the measuring steps: firstly, presetting the coal mill entrance ventilation quantity G (t/h), after completing calculation of a coal mill entrance air temperature Ti1 (DEG C), triggering a calculating unit to extract a stored coal mill entrance temperature Ti (DEG C), comparing with the coal mill entrance air temperature Ti1 obtained by calculation, calculating out a coal mill entrance air temperature difference value dTi, and storing; after completing calculation of the coal mill entrance air temperature difference value dTi, triggering the calculating unit to extract the stored coal mill entrance air temperature difference value dTi, and comparing and judging with 1: if the dTi is less than 1, the preset coal mill entrance ventilation quantity G (t/h) is the current coal mill entrance actual ventilation quantity; and if the dTi is greater than or equal to 1, the preset coal mill entrance ventilation quantity G (t/h) is wrong, the coal mill entrance ventilation quantity G (t/h) is required to be anew preset, measurement is carried out again until the dTi is less than 1. The measurement result has high precision, and is convenient for optimization and adjustment of operation of a pulverizing system.
Description
Technical field
The present invention relates to a kind of flexible measurement method of ventilation, particularly a kind of measuring method of coal pulverizer inlet ventilation.
Background technology
Along with the increase of thermal power plant unit capacity, coordinate the raising of level of control, Measurement accuracy and the control of boiler unit air quantity seem more important; Special inaccurate in the measurement of coal pulverizer inlet air quantity; usually can cause air quantity and fuel regulation, boiler load coordination etc. cannot drop into automatically; also cause combustion conditions not good; boiler operating efficiency declines; and because coal pulverizer ventilation deficiency causes coal pulverizer obstruction, tripping operation etc., to safe and economical boiler, operation has brought hidden danger.
Power boiler breeze burner need keep suitable coal-air ratio to meet the requirement of safety and economic operation, therefore the apparatus for measuring air quantity of different types is all housed on coal pulverizer inlet air channel for measuring the ventilation of coal pulverizer; But in actual motion, because coal pulverizer inlet air channel straight length is too short or the problem of apparatus for measuring air quantity itself, the result of its air measuring often exists larger deviation, or even completely unavailable, to pulverized coal preparation system, operation is optimized and revised and has been brought very large difficulty.
Summary of the invention
The present invention is directed to the problems such as existing coal pulverizer inlet ventilation measurement result deviation is large, precision is very low, and a kind of coal pulverizer inlet ventilation measuring method of optimization is provided.The measurement result precision of this measuring method is high, is convenient to pulverized coal preparation system operation and optimizes and revises.
For achieving the above object, technical scheme of the present invention is as follows:
A measuring method for coal pulverizer inlet ventilation, this measuring method is implemented based on intelligent test device, and it comprises the steps:
(1) measurement mechanism in intelligent test device is measured raw coal moisture content Wy(%), coal pulverizer inlet temperature T i(DEG C), coal pulverizer outlet temperature To(DEG C), environment temperature Ta(DEG C), pulverizer capacity Bm(t/h) and coal pulverizer power P (kW), and store;
(2) computing unit in intelligent test device is according to the raw coal moisture content Wy(% of the pattern of coal pulverizer and measurement) calculate corresponding coal pulverizer sealing air quantity Gf(t/h) and the intrinsic moisture content Wmf(% of coal dust), and store;
(3) computing unit is according to the measured and default coal pulverizer inlet ventilation value G(t/h of data that calculate), and store;
(4) computing unit triggers the coal pulverizer outlet temperature To(DEG C that extracts storage) and environment temperature Ta(DEG C), with raw coal evaporation moisture content mass flow Dw(kg/s) calculate raw coal evaporation moisture content heat absorption Qxr1(kJ/s), and store;
(5) calculating raw coal evaporation moisture content heat absorption Qxr1(kJ/s) after, computing unit triggers the coal pulverizer outlet temperature To(DEG C that extracts storage) and environment temperature Ta(DEG C), with coal flow Dmfm(kg/s in coal pulverizer outlet coal dust) calculate the heat absorption Qxr2(kJ/s of coal in heating coal dust), and store;
(6) at the heat absorption Qxr2(kJ/s that calculates coal in heating coal dust) after, computing unit triggers the coal pulverizer outlet temperature To(DEG C that extracts storage) and environment temperature Ta(DEG C), with moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust) calculate the heat absorption Qxr3(kJ/s of moisture content in heating coal dust), and store;
(7) at the heat absorption Qxr3(kJ/s that calculates moisture content in heating coal dust) after, computing unit triggers the coal pulverizer sealing air quantity Gf(t/h that extracts storage) and coal pulverizer outlet temperature To(DEG C) and environment temperature Ta(DEG C) calculate the coal pulverizer sealing air Qxr4(kJ/s that recepts the caloric), and store;
(8) calculating coal pulverizer sealing air caloric receptivity Qxr4(kJ/s) after, computing unit triggers the raw coal evaporation moisture content heat absorption Qxr1(kJ/s that extracts storage), the heat absorption Qxr2(kJ/s of coal in heating coal dust) and heating coal dust in the heat absorption Qxr3(kJ/s of moisture content), calculate total caloric receptivity Qxr(kJ/s with it), and store;
(9) calculating total caloric receptivity Qxr(kJ/s) after, the coal pulverizer power P of computing unit triggering extraction storage calculates to mill and produces heat Qnm(kJ/s), and store;
(10) produce heat Qnm(kJ/s milling) has calculated after, computing unit triggers and extracts the total caloric receptivity Qxr(kJ/s that gets storing) calculate radiation loss Qsr(kJ/s), and store;
(11) complete radiation loss Qsr(kJ/s) calculating after, computing unit triggers the total caloric receptivity Qxr(kJ/s that extracts storage), milling produces heat Qnm(kJ/s), default coal pulverizer inlet ventilation G(t/h) and coal pulverizer outlet temperature To(DEG C), calculate coal pulverizer inlet wind-warm syndrome Ti1(DEG C with it), and store;
(12) complete coal pulverizer inlet wind-warm syndrome Ti1(DEG C) calculating after, computing unit trigger extract storage coal pulverizer inlet temperature T i(DEG C), calculate coal pulverizer inlet wind-warm syndrome difference dTi with it, and store;
(13) complete after the calculating of coal pulverizer inlet wind-warm syndrome difference dTi, computing unit will trigger the coal pulverizer inlet wind-warm syndrome difference dTi that extracts storage, by it and 1 compare judgement: if dTi < 1, default coal pulverizer inlet ventilation value G(t/h in determining step (3)) be the actual ventilation of coal pulverizer inlet now; If dTi >=1, default coal pulverizer inlet ventilation value G(t/h in determining step (3)) mistake, again default coal pulverizer inlet ventilation value G(t/h), repeating step (3) is to (13), until obtain dTi < 1;
(14) after the actual ventilation of calculative determination coal pulverizer inlet, will the value of obtaining reach pulverized coal preparation system operation and optimize and revise system, carry out pulverized coal preparation system operation and optimize and revise operation.
In preferred embodiment of the present invention, raw coal in described step (4) evaporation moisture content mass flow Dw(kg/s) extracted the pulverizer capacity Bm(t/h of storage by computing unit), raw coal moisture content Wy(%), the intrinsic moisture content Wmf(% of coal dust) value, calculate and store.
Further, coal flow Dmfm(kg/s in the outlet of the coal pulverizer in described step (5) coal dust) obtain as follows:
(51) computing unit triggers the pulverizer capacity Bm(t/h that extracts storage), raw coal moisture content Wy(%), the intrinsic moisture content Wmf(% of coal dust) value, calculate raw coal evaporation moisture content mass flow Dw(kg/s), and store;
(52) calculating raw coal evaporation moisture content mass flow Dw(kg/s) after, computing unit triggers and extracts pulverizer capacity Bm(t/h again) value, calculate coal pulverizer outlet pulverized coal mass flow Dmf(kg/s with it), and store;
(53) calculating coal pulverizer outlet pulverized coal mass flow Dmf(kg/s) after, computing unit triggers the intrinsic moisture content Wmf(% of coal dust that extracts storage) value, calculate moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust with it), and store;
(54) calculating moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust) after, computing unit triggers the coal pulverizer outlet pulverized coal mass flow Dmf(kg/s that extracts storage), calculate coal flow Dmfm(kg/s in coal pulverizer outlet coal dust with it), and store.
Further, in described step (6), coal pulverizer exports moisture content flow Dmfw(kg/s in coal dust) obtain as follows:
(61) computing unit triggers the pulverizer capacity Bm(t/h that extracts storage), raw coal moisture content Wy(%), the intrinsic moisture content Wmf(% of coal dust) value, calculate raw coal evaporation moisture content mass flow Dw(kg/s), and store;
(62) calculating raw coal evaporation moisture content mass flow Dw(kg/s) after, computing unit triggers and extracts pulverizer capacity Bm(t/h again) value, calculate coal pulverizer outlet pulverized coal mass flow Dmf(kg/s with it), and store;
(63) calculating coal pulverizer outlet pulverized coal mass flow Dmf(kg/s) after, computing unit triggers the intrinsic moisture content Wmf(% of coal dust that extracts storage) value, calculate moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust with it), and store.
By technique scheme, the invention has the beneficial effects as follows:
1, certainty of measurement is reasonable, deviation is little; The present invention grinds coal-fired Industrial Analysis data and actual operation parameters according to coal pulverizer, adopt thermal balance scheme indirectly to measure coal pulverizer inlet air quantity, greatly improve the precision of measured coal machine entrance air quantity, very approaching with actual entry air quantity, be greatly convenient to follow-up powder process and be optimized adjustment operation.
2, the method can realize the automation of whole measuring process, without manual intervention, greatly improves its efficiency.
3, computational process is simple, enforcement is convenient; The present invention is except raw coal moisture content is the daily manual analysis of power plant, and all the other initial data are the operational factor of conventional monitoring in the coal-fired thermal power generation unit of bringing normally into operation, without the extra measurement point that increases.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the logic diagram of measuring method of the present invention.
Symbol used in literary composition:
Wy: raw coal moisture content (%); Ti: coal pulverizer inlet temperature (DEG C); To: coal pulverizer outlet temperature (DEG C); Ta: environment temperature (DEG C); Bm: pulverizer capacity (t/h); P: coal pulverizer power (kW); Gf: coal pulverizer sealing air quantity (t/h); Wmf: the intrinsic moisture content of coal dust (%); G: coal pulverizer inlet ventilation; Dw: raw coal evaporation moisture content mass flow (kg/s); Dmf: coal pulverizer outlet pulverized coal mass flow (kg/s); Dmfw: moisture content flow (kg/s) in coal pulverizer outlet coal dust; Dmfm: coal flow (kg/s) in coal pulverizer outlet coal dust; Qxr1: raw coal evaporation moisture content heat absorption (kJ/s); Cps: the average specific heat at constant pressure of water vapour; Cpw: the average specific heat at constant pressure of water; Qxr2: the heat absorption (kJ/s) of coal in heating coal dust; Cpm: the average specific heat at constant pressure of coal; Qxr3: the heat absorption (kJ/s) of moisture content in heating coal dust; Qxr4: coal pulverizer sealing air caloric receptivity (kJ/s); Cpk: the average specific heat at constant pressure of air; Qxr: always caloric receptivity; Qnm: mill and produce heat (kJ/s); K: the heat coefficient of milling of coal pulverizer; Qsr: radiation loss (kJ/s); Ti1: coal pulverizer inlet wind-warm syndrome calculated value (DEG C); DTi: coal pulverizer inlet wind-warm syndrome difference.
Detailed description of the invention
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
The design feature that the present invention is directed to existing coal pulverizer proposes a kind ofly to grind coal-fired Industrial Analysis data and actual operation parameters according to coal pulverizer, and adopts thermal balance mode indirectly to measure the method for coal pulverizer inlet air quantity.
The method is implemented based on corresponding intelligent device for measuring, and this intelligent device for measuring mainly comprises corresponding sense measuring device, computer center's (or computing unit) and data storage cell.
Wherein, sense measuring device has some sensors, measures the required every initial data of coal pulverizer inlet air quantity, and ensure corresponding precision for obtaining.
Computer center carries out the corresponding entrance airflow value of heat Balance Calculation according to the measured initial data of sense measuring device.
The data that data storage cell obtains according to command calculations for real-time storage computer center (computing unit).
Accordingly, the measuring method of coal pulverizer inlet ventilation provided by the invention, its concrete steps following (referring to Fig. 1):
(1) measurement mechanism in intelligent test device measures required initial data: raw coal moisture content Wy(%), coal pulverizer inlet temperature T i(DEG C), coal pulverizer outlet temperature To(DEG C), environment temperature Ta(DEG C), pulverizer capacity Bm(t/h) and coal pulverizer power P (kW), and store.
These above-mentioned initial data are except utilizing corresponding sense measuring device measures timely, in specific implementation process, except raw coal moisture content Wy(%), remainder data can obtain according to the operational factor of conventional monitoring in the coal-fired thermal power generation unit of bringing normally into operation, without the extra measurement point that increases; And raw coal moisture content Wy(%) can adopt one class of Industrial Analysis total moisture that enters stove coal to grind coal-fired moisture value as current operation coal pulverizer.
Wherein, pulverizer capacity Bm(t/h) adopt coal pulverizer inlet coal supply machine-made egg-shaped or honey-comb coal briquets amount to represent; Coal pulverizer power P (kW) adopts coal pulverizer motor power (output) to represent.
(2) after the measurement and storage that complete initial data, computing unit in intelligent test device is according to the raw coal moisture content Wy(% of the pattern of coal pulverizer and measurement) calculate corresponding coal pulverizer sealing air quantity Gf(t/h) and the intrinsic moisture content Wmf(% of coal dust), and store.
In the specific implementation, calculate coal pulverizer sealing air quantity Gf(t/h) time, the number range of sealing air flow in coal pulverizer operation instructions met; At the intrinsic moisture content Wmf(% of calculating coal dust) time, the regulation in " DL/T_466-2004 power station coal pulverizer and pulverized coal preparation system type selecting directive/guide " met.
(3) complete after the DATA REASONING of above-mentioned steps, calculating and storage, computing unit will be preset a coal pulverizer inlet ventilation value G(t/h according to measured and data that calculate), and store.
(4), after having preset, computing unit extracts corresponding pulverizer capacity Bm(t/h), raw coal moisture content Wy(%), the intrinsic moisture content Wmf(% of coal dust) value, calculate raw coal evaporation moisture content mass flow Dw(kg/s), and store; In this step, for raw coal evaporation moisture content mass flow Dw(kg/s) can adopt following computing formula to carry out:
Dw（kg/s）=Bm*（Wy-Wmf）/（100-Wmf）/3.6。
(5) calculating raw coal evaporation moisture content mass flow Dw(kg/s) after, pulverizer capacity Bm(t/h is extracted in triggering by computing unit again) value, calculate coal pulverizer outlet pulverized coal mass flow Dmf(kg/s with it), and store.
In this step, for coal pulverizer outlet pulverized coal mass flow Dmf(kg/s) calculating, adopt following formula to carry out:
Dmf（kg/s）=Bm/3.6-Dw。
(6) calculating coal pulverizer outlet pulverized coal mass flow Dmf(kg/s) after, computing unit triggers the intrinsic moisture content Wmf(% of coal dust that extracts storage) value, calculate moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust with it), and store.
In this step, for moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust) calculating, computing unit adopts following formula to carry out:
Dmfw（kg/s）=Dmf*Wmf/100。
(7) calculating moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust) after, computing unit triggers the coal pulverizer outlet pulverized coal mass flow Dmf(kg/s that extracts storage), calculate coal flow Dmfm(kg/s in coal pulverizer outlet coal dust with it), and store.
In this step, for coal flow Dmfm(kg/s in coal pulverizer outlet coal dust) calculating, computing unit adopts following formula to carry out:
Dmfm（kg/s）=Dmf-Dmfw。
(8) calculating coal flow Dmfm(kg/s in coal pulverizer outlet coal dust) after, computing unit triggers the raw coal evaporation moisture content mass flow Dw(kg/s that extracts storage), coal pulverizer outlet temperature To(DEG C) and environment temperature Ta(DEG C), calculate raw coal evaporation moisture content heat absorption Qxr1(kJ/s), and store.
In this step, for raw coal evaporation moisture content heat absorption Qxr1(kJ/s) calculating, computing unit adopts following formula to carry out:
Qxr1(kJ/s)=Dw* (2501+Cps*To-Cpw*Ta), the average specific heat at constant pressure that wherein Cps is water vapour, the average specific heat at constant pressure that Cpw is water.
(9) calculating raw coal evaporation moisture content heat absorption Qxr1(kJ/s) after, computing unit triggers coal flow Dmfm(kg/s in the coal pulverizer outlet coal dust that extracts storage), coal pulverizer outlet temperature To(DEG C) and environment temperature Ta(DEG C) calculate the heat absorption Qxr2(kJ/s of coal in heating coal dust), and store;
In this step, for the heat absorption Qxr2(kJ/s of coal in heating coal dust) calculating, computing unit adopts following formula to carry out:
Qxr2(kJ/s)=Dmfm* (To-Ta) * Cpm, the average specific heat at constant pressure that wherein Cpm is coal.
(10) at the heat absorption Qxr2(kJ/s that calculates coal in heating coal dust) after, computing unit triggers moisture content flow Dmfw(kg/s in the coal pulverizer outlet coal dust that extracts storage), and coal pulverizer outlet temperature To(DEG C) and environment temperature Ta(DEG C) calculate the heat absorption Qxr3(kJ/s of moisture content in heating coal dust), and store.
In this step, for the heat absorption Qxr3(kJ/s of moisture content in heating coal dust) calculating, computing unit adopts following formula to carry out:
Qxr3(kJ/s)=Dmfw* (To-Ta) * Cpw, the average specific heat at constant pressure that wherein Cpw is water.
(11) at the heat absorption Qxr3(kJ/s that calculates moisture content in heating coal dust) after, computing unit triggers the coal pulverizer sealing air quantity Gf(t/h that extracts storage) and coal pulverizer outlet temperature To(DEG C) and environment temperature Ta(DEG C) calculate the coal pulverizer sealing air Qxr4(kJ/s that recepts the caloric), and store;
In this step, for coal pulverizer sealing air caloric receptivity Qxr4(kJ/s) calculating, computing unit adopts following formula to carry out:
Qxr4(kJ/s)=Gf/3.6* (To-Ta) * Cpk, the average specific heat at constant pressure that wherein Cpk is air.
(12) calculating coal pulverizer sealing air caloric receptivity Qxr4(kJ/s) after, computing unit triggers the raw coal evaporation moisture content heat absorption Qxr1(kJ/s that extracts storage), the heat absorption Qxr2(kJ/s of coal in heating coal dust) and heating coal dust in the heat absorption Qxr3(kJ/s of moisture content), calculate total caloric receptivity Qxr(kJ/s with it), and store.
In this step, for total caloric receptivity Qxr(kJ/s) calculating, computing unit adopts following formula to carry out:
Qxr（kJ/s）=Qxr1+Qxr2+Qxr3+Qxr4。
(13) calculating total caloric receptivity Qxr(kJ/s) after, the coal pulverizer power P of computing unit triggering extraction storage calculates to mill and produces heat Qnm(kJ/s), and store.
In this step, produce heat Qnm(kJ/s for milling) calculating, computing unit adopts following formula to carry out:
Qnm(kJ/s)=P*K, what wherein K was coal pulverizer mill heat coefficient, chooses according to coal pulverizer type.
(14) produce heat Qnm(kJ/s milling) has calculated after, computing unit triggers and extracts the total caloric receptivity Qxr(kJ/s that gets storing) calculate radiation loss Qsr(kJ/s), and store.
In this step, for radiation loss Qsr(kJ/s) calculating, computing unit adopts following formula to carry out:
Qsr（kJ/s）=Qxr*0.02。
(15) complete radiation loss Qsr(kJ/s) calculating after, computing unit triggers the total caloric receptivity Qxr(kJ/s that extracts storage), milling produces heat Qnm(kJ/s), default coal pulverizer inlet ventilation G(t/h) and coal pulverizer outlet temperature To(DEG C), calculate coal pulverizer inlet wind-warm syndrome Ti1(DEG C with it), and store.
In this step, for coal pulverizer inlet wind-warm syndrome Ti1(DEG C) calculating, computing unit adopts following formula to carry out:
Ti1（℃）=(Qxr-Qnm+Qsr)/（G/3.6）/Cpk+To。
(16) complete coal pulverizer inlet wind-warm syndrome Ti1(DEG C) calculating after, computing unit trigger extract storage coal pulverizer inlet temperature T i(DEG C), calculate coal pulverizer inlet wind-warm syndrome difference dTi with it, and store.
In this step, for the calculating of coal pulverizer inlet wind-warm syndrome difference dTi, computing unit adopts following formula to carry out:
DTi=abs(Ti1-Ti), wherein abs () is ABS function.
(17) complete after the calculating of coal pulverizer inlet wind-warm syndrome difference dTi, computing unit will trigger the coal pulverizer inlet wind-warm syndrome difference dTi that extracts storage, by it and 1 compare judgement: if dTi < 1, default coal pulverizer inlet ventilation value G(t/h in determining step (3)) be the actual ventilation of coal pulverizer inlet now; If dTi >=1, default coal pulverizer inlet ventilation value G(t/h in determining step (3)) mistake, again default coal pulverizer inlet ventilation value G(t/h), repeating step (3) is to (17), until obtain dTi < 1.
In this step reseting coal pulverizer inlet ventilation value G(t/h) time, computing unit can be on default before coal pulverizer inlet ventilation value G(t/h) impact that produces in computational process analyzes, excessive or too small while analyzing its preset value, and accurately preset according to analysis result, avoid too much computing repeatedly, greatly improve computational speed.
(18) after the actual ventilation of calculative determination coal pulverizer inlet, will the value of obtaining reach pulverized coal preparation system operation and optimize and revise system, carry out pulverized coal preparation system operation and optimize and revise operation.
In above-mentioned example, carry out successively computation and measurement according to above-mentioned particular step, and by triggering and can realize intellectuality and the automation of whole measuring process successively between each step, and can simplified measurement step, avoid the appearance of redundant measurement step, the measurement efficiency greatly improving.
Meanwhile, the result in each measuring process adopts corresponding computing formula to calculate, and can effectively ensure to obtain in each step the accuracy of result, thereby ensures the accuracy of final measurement.
Above-mentioned example can actual ventilation measuring cell cannot provide with reference to time, for operation adjustment provides the accurate measurement method of a ventilation.
More than show and described general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and description, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1. a measuring method for coal pulverizer inlet ventilation, is characterized in that, this measuring method is implemented based on intelligent test device, and it comprises the steps:
(1) measurement mechanism in intelligent test device is measured raw coal moisture content Wy(%), coal pulverizer inlet temperature T i(DEG C), coal pulverizer outlet temperature To(DEG C), environment temperature Ta(DEG C), pulverizer capacity Bm(t/h) and coal pulverizer power P (kW), and store;
(2) computing unit in intelligent test device is according to the raw coal moisture content Wy(% of the pattern of coal pulverizer and measurement) calculate corresponding coal pulverizer sealing air quantity Gf(t/h) and the intrinsic moisture content Wmf(% of coal dust), and store;
(3) computing unit is according to the measured and default coal pulverizer inlet ventilation G(t/h of data that calculate), and store;
(4) computing unit triggers the coal pulverizer outlet temperature To(DEG C that extracts storage) and environment temperature Ta(DEG C), with raw coal evaporation moisture content mass flow Dw(kg/s) calculate raw coal evaporation moisture content heat absorption Qxr1(kJ/s), and store;
(5) calculating raw coal evaporation moisture content heat absorption Qxr1(kJ/s) after, computing unit triggers the coal pulverizer outlet temperature To(DEG C that extracts storage) and environment temperature Ta(DEG C), with coal flow Dmfm(kg/s in coal pulverizer outlet coal dust) calculate the heat absorption Qxr2(kJ/s of coal in heating coal dust), and store;
(6) at the heat absorption Qxr2(kJ/s that calculates coal in heating coal dust) after, computing unit triggers the coal pulverizer outlet temperature To(DEG C that extracts storage) and environment temperature Ta(DEG C), with moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust) calculate the heat absorption Qxr3(kJ/s of moisture content in heating coal dust), and store;
(7) at the heat absorption Qxr3(kJ/s that calculates moisture content in heating coal dust) after, computing unit triggers the coal pulverizer sealing air quantity Gf(t/h that extracts storage) and coal pulverizer outlet temperature To(DEG C) and environment temperature Ta(DEG C) calculate the coal pulverizer sealing air Qxr4(kJ/s that recepts the caloric), and store;
(8) calculating coal pulverizer sealing air caloric receptivity Qxr4(kJ/s) after, computing unit triggers the raw coal evaporation moisture content heat absorption Qxr1(kJ/s that extracts storage), the heat absorption Qxr2(kJ/s of coal in heating coal dust) and heating coal dust in the heat absorption Qxr3(kJ/s of moisture content), calculate total caloric receptivity Qxr(kJ/s with it), and store;
(9) calculating total caloric receptivity Qxr(kJ/s) after, the coal pulverizer power P of computing unit triggering extraction storage calculates to mill and produces heat Qnm(kJ/s), and store;
(10) produce heat Qnm(kJ/s milling) has calculated after, computing unit triggers and extracts the total caloric receptivity Qxr(kJ/s storing) calculate radiation loss Qsr(kJ/s), and store;
(11) complete radiation loss Qsr(kJ/s) calculating after, computing unit triggers the total caloric receptivity Qxr(kJ/s that extracts storage), milling produces heat Qnm(kJ/s), default coal pulverizer inlet ventilation G(t/h) and coal pulverizer outlet temperature To(DEG C), calculate coal pulverizer inlet wind-warm syndrome Ti1(DEG C with it), and store;
(12) complete coal pulverizer inlet wind-warm syndrome Ti1(DEG C) calculating after, computing unit trigger extract storage coal pulverizer inlet temperature T i(DEG C), calculate coal pulverizer inlet wind-warm syndrome difference dTi with it, and store;
(13) complete after the calculating of coal pulverizer inlet wind-warm syndrome difference dTi, computing unit will trigger the coal pulverizer inlet wind-warm syndrome difference dTi that extracts storage, by it and 1 compare judgement: if dTi < 1, default coal pulverizer inlet ventilation value G(t/h in determining step (3)) be the actual ventilation of coal pulverizer inlet now; If dTi >=1, default coal pulverizer inlet ventilation value G(t/h in determining step (3)) mistake, again default coal pulverizer inlet ventilation value G(t/h), repeating step (3) is to (13), until obtain dTi < 1;
(14) after the actual ventilation of calculative determination coal pulverizer inlet, will the value of obtaining reach pulverized coal preparation system operation and optimize and revise system, carry out pulverized coal preparation system operation and optimize and revise operation.
2. the measuring method of a kind of coal pulverizer inlet ventilation according to claim 1, it is characterized in that, raw coal in described step (4) evaporation moisture content mass flow Dw(kg/s) extracted the pulverizer capacity Bm(t/h of storage by computing unit), raw coal moisture content Wy(%), the intrinsic moisture content Wmf(% of coal dust) value, calculate and store.
3. the measuring method of a kind of coal pulverizer inlet ventilation according to claim 1, is characterized in that, coal flow Dmfm(kg/s in the coal pulverizer outlet coal dust in described step (5)) obtain as follows:
(51) computing unit triggers the pulverizer capacity Bm(t/h that extracts storage), raw coal moisture content Wy(%), the intrinsic moisture content Wmf(% of coal dust) value, calculate raw coal evaporation moisture content mass flow Dw(kg/s), and store;
(52) calculating raw coal evaporation moisture content mass flow Dw(kg/s) after, computing unit triggers and extracts pulverizer capacity Bm(t/h again) value, calculate coal pulverizer outlet pulverized coal mass flow Dmf(kg/s with it), and store;
(53) calculating coal pulverizer outlet pulverized coal mass flow Dmf(kg/s) after, computing unit triggers the intrinsic moisture content Wmf(% of coal dust that extracts storage) value, calculate moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust with it), and store;
(54) calculating moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust) after, computing unit triggers the coal pulverizer outlet pulverized coal mass flow Dmf(kg/s that extracts storage), calculate coal flow Dmfm(kg/s in coal pulverizer outlet coal dust with it), and store.
4. the measuring method of a kind of coal pulverizer inlet ventilation according to claim 1, is characterized in that, in described step (6), coal pulverizer exports moisture content flow Dmfw(kg/s in coal dust) obtain as follows:
(61) computing unit triggers the pulverizer capacity Bm(t/h that extracts storage), raw coal moisture content Wy(%), the intrinsic moisture content Wmf(% of coal dust) value, calculate raw coal evaporation moisture content mass flow Dw(kg/s), and store;
(62) calculating raw coal evaporation moisture content mass flow Dw(kg/s) after, computing unit triggers and extracts pulverizer capacity Bm(t/h again) value, calculate coal pulverizer outlet pulverized coal mass flow Dmf(kg/s with it), and store;
(63) calculating coal pulverizer outlet pulverized coal mass flow Dmf(kg/s) after, computing unit triggers the intrinsic moisture content Wmf(% of coal dust that extracts storage) value, calculate moisture content flow Dmfw(kg/s in coal pulverizer outlet coal dust with it), and store.
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