CN104008307A - Method for calculating in-boiler coal amount of pulverized coal and blast furnace gas multi-fuel-fired boiler - Google Patents

Abstract

The invention discloses a method for calculating the in-boiler coal amount of a pulverized coal and blast furnace gas multi-fuel-fired boiler. The problem that in the prior art, the in-boiler coal mount corresponding to the working condition can not be accurately acquired in a direct measuring mode for a boiler which is provided with a storage pulverizing system is solved. According to the method, acquired input parameters are used, then step by step computation is conducted, and at last the volume content percentage of three-atom gas in dry flue gas is obtained, the difference value of the calculating value of the volume content percentage of the three-atom gas and a practical measuring value is compared with a preset error range, if the difference value of the calculating value of the volume content percentage of the three-atom gas and the practical measuring value is beyond the preset error range, the in-boiler coal amount is regulated and calculated again until the difference value of the calculating value and the practical measuring value is within the preset error range, and the practical in-boiler coal amount is determined. The method solves the difficult problem that the in-boiler coal amount can not be calculated accurately in the boiler which is provided with the storage pulverizing system, and therefore the thermal efficiency of the pulverized coal and blast furnace gas multi-fuel-fired boiler can be conducted smoothly.

Description

The measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler

Technical field

The present invention relates to the measuring method that enters stove Coal-fired capacity of a kind of coal dust and blast furnace gas multi-fuel fired boiler.

Background technology

Iron and steel enterprise produces a large amount of blast furnace gases in the process of smelting, because blast furnace gas has, calorific value is low, nitrogen content is high and the feature of poor combustion stability, current many steel plant are all insufficient to the utilization of blast furnace gas, a large amount of blast furnace gases is all diffused, cause the waste of the energy, so how to make full use of the blast furnace gas resource of by-product in process for producing steel and iron, become the problem that person skilled is generally concerned about.

In recent years, coal dust and blast furnace gas multi-fuel fired boiler have been obtained successful Application and have progressively promoted in some steel plant, by blast furnace gas is introduced to pulverized coal firing boiler, solve the blast furnace gas comparatively problem of difficulty of burning separately, effectively reduce the bleeding rate of blast furnace gas.And from the angle of steel plant, adopt the mode of coal dust and blast furnace gas multifuel combustion can utilize preferably blast furnace gas, contribute to realize the balance of blast furnace gas pipeline network.In addition, pulverized coal firing boiler is mixed after burning blast-furnace gas, SO ₂, NO _xall reduce significantly compared with traditional pulverized coal firing boiler with the discharge capacity of dust granules thing.Therefore, the mode of coal dust and blast furnace gas multifuel combustion has wide application prospect, especially, under current resource growing tension and the more and more higher situation of environmental requirement, more can highlight its economic benefit and social benefit.

The thermal efficiency of boiler has reflected the heat-economy of unit operation, is the key index of unit performance examination.For coal dust and blast furnace gas multi-fuel fired boiler, the calculating of its thermal efficiency and the pure firing coal dust boiler of routine or the maximum difference of pure burning blast-furnace gas boiler are the measurement problem of fuel quantity.For pure firing coal dust boiler or the pure burning blast-furnace gas boiler of routine, utilize anti-EQUILIBRIUM CALCULATION FOR PROCESS method not need into stove fuel quantity; And for coal dust and blast furnace gas multi-fuel fired boiler, accurately solve the thermal efficiency of coal dust and blast furnace gas multi-fuel fired boiler, and be no matter to adopt positive balance computing method or anti-EQUILIBRIUM CALCULATION FOR PROCESS method, all must be known enter stove Coal-fired capacity and enter the proportioning of stove blast furnace coal tolerance.For the boiler of configuration unit pulverized-coal system, can adopt coal-supplying amount that belt weight coal conveyer measures to enter stove Coal-fired capacity as boiler; For the boiler of configuration the ball type pulverizer system, because the coal dust amount of finally sending into burner hearth is not peer-to-peer with the coal-supplying amount that enters coal pulverizer, be difficult to enter stove Coal-fired capacity under the corresponding operating mode of Obtaining Accurate by the mode of direct measurement, and the configuration of most coal dust and blast furnace gas multi-fuel fired boiler is all the ball type pulverizer system, this brings very large difficulty just to solving of boiler thermal output.

Therefore, building a measuring method that enters stove Coal-fired capacity that is applicable to coal dust and blast furnace gas multi-fuel fired boiler, is the breach that the thermal efficiency that solves current coal dust and blast furnace gas multi-fuel fired boiler solves a difficult problem, has important Practical significance.

Summary of the invention

For the problems referred to above, the invention provides a kind of accurately, the measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler easily.

For achieving the above object, the measuring method that enters stove Coal-fired capacity of coal dust of the present invention and blast furnace gas multi-fuel fired boiler comprises:

Step 1, obtains input parameter, and described input parameter at least comprises dry flue gas parameter, the percentile measured value φ ' of the volume content (RO that described dry flue gas parameter at least comprises three atomic gas in dry flue gas ₂);

Step 2, predetermined one enters stove Coal-fired capacity B _c;

Step 3, calculates the described stove Coal-fired capacity B that is incorporated in advance _cthe performance data of the fuel blend under condition;

Step 4, calculates the described stove Coal-fired capacity B that is incorporated in advance _cthe carbon mass content percent that fuel blend Actual combustion under condition is fallen;

Step 5, calculates the described stove Coal-fired capacity B that is incorporated in advance _cfuel blend characteristic coefficient under condition;

Step 6, calculates the described stove Coal-fired capacity B that is incorporated in advance _cthe volume content percent φ ' of three atomic gas in dry flue gas under condition _js(RO ₂);

Step 7, by the volume content percent φ ' of three atomic gas in the described dry flue gas calculating _js(RO ₂) with described dry flue gas in the percentile measured value φ ' of the volume content (RO of three atomic gas ₂) compare, if the difference of the two exceedes predictive error scope, will as the new stove Coal-fired capacity B that is incorporated in advance _c, then re-execute step 3～step 7, until calculate φ ' _js(RO ₂) and φ ' (RO ₂) difference within the scope of predictive error, determine the final stove Coal-fired capacity B that is incorporated in advance _center stove Coal-fired capacity B as reality _c.

Further, described input parameter also comprises performance data, the lime-ash parameter of coal-fired performance data, blast furnace gas and enters stove blast furnace gas flow;

The performance data of described fire coal comprises coal-fired as received basis ash content mass content percent, coal-fired as received basis carbon mass content percent, coal-fired as received basis protium mass content percent, coal-fired as received basis oxygen element mass content percent, coal-fired as received basis nitrogen element mass content percent and coal-fired as received basis element sulphur mass content percent;

The performance data of described blast furnace gas comprises volume content percent, the H of the CO in blast furnace gas ₂volume content percent, CO ₂volume content percent, N ₂volume content percent, O ₂volume content percent, hydrocarbon C _mh _nvolume content percent and the volume content percent of moisture;

Described lime-ash parameter comprises unburned carbon in flue dust and boiler slag carbon content;

Described dry flue gas parameter also comprises O in dry flue gas ₂the percentile measured value of volume content, the percentile measured value of volume content of CO;

The performance data of described fuel blend comprises fuel blend as received basis ash content mass content percent, fuel blend as received basis carbon mass content percent, fuel blend as received basis protium mass content percent, fuel blend as received basis oxygen element mass content percent, fuel blend as received basis nitrogen element mass content percent, fuel blend as received basis element sulphur mass content percent.

Further, the calculating general formula of the performance data of described fuel blend is

y _i＝b _coalx _coal,i+b _gasx _gas,i，

Wherein y _ifor the performance data of described fuel blend, b _coal, b _gasbe respectively coal-fired consumption and blast furnace gas consumption and account for the share of fuel blend consumption, x _{coal, i}, x _{gas, i}be respectively the coal-fired performance data corresponding with the performance data of fuel blend and the performance data of blast furnace gas;

B _coal, b _gascomputing formula be respectively: $b_{\mathrm{coal}}=\frac{B_c}{B_c+B_g/{\mathrm{\ρ}}_{\mathrm{gas}}},b_{\mathrm{gas}}=\frac{B_g/{\mathrm{\ρ}}_{\mathrm{gas}}}{B_c+B_g/{\mathrm{\ρ}}_{\mathrm{gas}}},$ B _cfor described enter stove Coal-fired capacity, B _gdescribed under standard state, enter stove blast furnace gas flow, ρ _gasfor the density of blast furnace gas under standard state.

Further, the density p of blast furnace gas under described standard state _gascomputing formula be

ρ _gas=0.0125 φ (CO)+0.0009 φ (H ₂)+∑ (0.0054m+0.00045n) φ (C _mh _n)+0.0196 φ (CO ₂)+0.0125 φ (N ₂)+0.0143 φ (O ₂)+0.008 φ (H ₂o), wherein φ (CO), φ (H ₂), φ (CO ₂), φ (N ₂), φ (O ₂), φ (C _mh _n), φ (H ₂o) be respectively volume content percent, the described H of CO described in the performance data of described blast furnace gas ₂volume content percent, described CO ₂volume content percent, described N ₂volume content percent, described O ₂volume content percent, described hydrocarbon C _mh _nvolume content percent and the volume content percent of described moisture.

Further, the percentile computing formula of carbon mass content that described fuel blend Actual combustion is fallen is

$C_{\mathrm{ar}}^r=C_{\mathrm{ar}}-\frac{A_{\mathrm{ar}}}{100}[\frac{r_{1z}{C}_{1z}^C}{100-C_{1z}^C}+\frac{r_{\mathrm{fh}}{C}_{\mathrm{fh}}^C}{100-C_{\mathrm{fh}}^C}],$

Wherein, for the carbon mass content percent that described fuel blend Actual combustion is fallen, C _ar, A _arbe respectively described fuel blend as received basis carbon mass content percent and described fuel blend as received basis ash content mass content percent, r _lz, r _fhthe ash amount in slag, flying dust that is respectively accounts for the coal-fired always share of grey amount, for described boiler slag carbon content, for described unburned carbon in flue dust.

Further, the computing formula of described fuel blend characteristic coefficient is

$\mathrm{\β}=2.35\frac{H_{\mathrm{ar}}-0.126O_{\mathrm{ar}}+0.038N_{\mathrm{ar}}}{C_{\mathrm{ar}}^r+{0.375S}_{\mathrm{ar}}},$

Wherein, β is described fuel blend characteristic coefficient, H _ar, O _ar, N _arand S _arbe respectively described fuel blend as received basis protium mass content percent, described fuel blend as received basis oxygen element mass content percent, described fuel blend as received basis nitrogen element mass content percent and described fuel blend as received basis element sulphur mass content percent.

Further, the volume content percent φ ' of three atomic gas in dry flue gas _js(RO ₂) computing formula be

wherein φ ' is (CO) the percentile measured value of volume content of CO in described dry flue gas, φ ' (O ₂) be O in described dry flue gas ₂the percentile measured value of volume content.

The measuring method that enters stove Coal-fired capacity of coal dust of the present invention and blast furnace gas multi-fuel fired boiler, by being incorporated in advance the dry flue gas compositional data of obtaining under stove Coal-fired capacity condition and the dry flue gas compositional data that analysis obtains to smoke sampling compares, if both differences are relatively outside predictive error scope, adjust and recalculate entering stove Coal-fired capacity, until both differences are within the scope of predictive error, thereby determine the final stove Coal-fired capacity that enters, overcome the difficulty that the boiler that configures the ball type pulverizer system in prior art cannot accurate measurement enters stove Coal-fired capacity, thereby make coal dust and the measuring and calculating of the blast furnace gas multi-fuel fired boiler thermal efficiency smooth.

Brief description of the drawings

Fig. 1 is schematic flow sheet of the present invention.

Embodiment

Below in conjunction with Figure of description, the present invention will be further described.

The measuring method that enters stove Coal-fired capacity of coal dust of the present invention and blast furnace gas multi-fuel fired boiler, comprises the following steps:

Step 1, obtains every input parameter, described every input parameter comprise coal-fired performance data, blast furnace gas performance data, lime-ash parameter, dry flue gas parameter, enter stove blast furnace gas flow.

Raw coal and coal dust are sampled and analyzed: on feeder and sediment tube, carry out respectively raw coal sampling and coal dust sampling, former coal sample and coal dust sample are carried out to assay and computing, obtain coal-fired special property data.Coal-fired special property data comprise mass content percent, the mass content percent of coal-fired as received basis nitrogen element and the mass content percent of coal-fired as received basis element sulphur of coal-fired as received basis ash content mass content percent, the mass content percent of coal-fired as received basis carbon, the mass content percent of coal-fired as received basis protium, coal-fired as received basis oxygen element;

Blast furnace gas is carried out to sampling and analysing: before boiler, on blast furnace gas pipeline, blast furnace gas is sampled, then blast furnace gas sample is carried out to assay and computing, obtain the performance data of blast furnace gas.The performance data of blast furnace gas comprises volume content percent φ (CO), the H of the CO in blast furnace gas ₂volume content percent φ (H ₂), CO ₂volume content percent φ (CO ₂), N ₂volume content percent φ (N ₂), O ₂volume content percent φ (O ₂), each hydrocarbon C _mh _nvolume content percent φ (C _mh _n) and the volume content percent φ (H of moisture ₂o);

Flying dust, slag are carried out to sampling and analysing: in air preheater exhaust pass, carry out Fly ash sampling, flying dust sample is carried out to unburned combustible in fly ash analysis, obtain unburned carbon in flue dust ; Carry out slag sampling in slag remover exit, slag sample is carried out to unburned combustible in slag analysis, obtain boiler slag carbon content .

Flue gas is carried out to sampling and analysing: in air preheater exhaust pass, by the principle of uniform cross section gridding method, to smoke sampling, and flue gas sample is analyzed and obtained dry flue gas parameter.Dry flue gas parameter comprises O in dry flue gas ₂the percentile measured value φ ' of volume content (O ₂), percentile measured value φ ' (CO) He the three atomic gas RO of volume content of CO ₂the percentile measured value φ ' of volume content (RO ₂);

Measure entering stove blast furnace gas flow: flowmeter is installed on blast furnace gas main pipe before boiler, is obtained into stove blast furnace gas flow B by flowmeter survey _g.

Step 2, predetermined one enters stove Coal-fired capacity B _c.

Step 3, calculates and is incorporated in advance stove Coal-fired capacity B _cthe performance data of the fuel blend under condition.

The performance data of described fuel blend comprises fuel blend as received basis ash content A _ar, fuel blend as received basis carbon mass content percent C _ar, fuel blend as received basis protium mass content percent H _ar, fuel blend as received basis oxygen element mass content percent O _ar, fuel blend as received basis nitrogen element mass content percent N _ar, fuel blend as received basis element sulphur mass content percent S _ar.

The calculating general formula of the performance data of fuel blend is: y _i=b _coalx _{coal, i}+ b _gasx _{gas, i},

Wherein, y _ifor a certain performance data in the performance data of above-mentioned fuel blend, x _{coal, i}, x _{gas, i}be respectively and y _icorresponding coal-fired performance data and the performance data of blast furnace gas, wherein the performance data x of blast furnace gas _{gas, i}for the performance data after converting, the characteristic after conversion and coal-fired characterisitic parameter x _{coal, i}characteristic identical; b _coal, b _gasbe respectively coal-fired consumption and blast furnace gas consumption and account for the share of fuel blend consumption.

B _coal, b _gascomputing formula be respectively

$b_{\mathrm{coal}}=\frac{B_c}{B_c+B_g/{\mathrm{\ρ}}_{\mathrm{gas}}}$ With

$b_{\mathrm{gas}}=\frac{B_g/{\mathrm{\ρ}}_{\mathrm{gas}}}{B_c+B_g/{\mathrm{\ρ}}_{\mathrm{gas}}}$

Wherein, B _xfor described enter stove Coal-fired capacity, B _cunit be kg/h; B _gdescribed under standard state, enter stove blast furnace gas flow, unit is m ³/ h; ρ _gasfor the density of blast furnace gas under standard state, unit is kg/m ³.

ρ _gascomputing method be

ρ _gas＝0.0125φ(CO)+0.0009φ(H ₂)+∑(0.0054m+0.00045n)φ(C _mH _n)+0.0196φ(CO ₂)+0.0125φ(N ₂)+0.0143φ(O ₂)+0.008φ(H ₂O)

In formula, φ (CO), φ (H ₂), φ (CO ₂), φ (N ₂), φ (O ₂), φ (C _mh _n), φ (H ₂o) be respectively CO, H in the blast furnace gas that in step 1, blast furnace gas is carried out obtaining after sampling and analyzing ₂, CO ₂, N ₂, O ₂, C _mh _n, H ₂the volume content percent of O.

Due to the performance data of blast furnace gas and coal-fired performance data variant in expression way, need to convert to the performance data of blast furnace gas in advance, could synthesize with coal-fired corresponding performance data.

Taking ultimate analysis composition as example, the volume content percent in the performance data of blast furnace gas need to be scaled blast furnace gas as received basis mass content percent in advance, could be synthetic with coal-fired as received basis elemental composition, and same blast furnace gas moisture as received coal is also like this.Be below the reduction formula of carbon, protium, oxygen element, nitrogen element:

${\left(C_{\mathrm{ar}}\right)}_{\mathrm{gas}}=\frac{0.54}{{\mathrm{\ρ}}_{\mathrm{gas}}}[\mathrm{\φ}\left(\mathrm{CO}\right)+\mathrm{\φ}\left({\mathrm{CO}}_2\right)+\mathrm{\Σm\φ}\left(C_m{H}_n\right)]$

${\left(H_{\mathrm{ar}}\right)}_{\mathrm{gas}}=\frac{0.045}{{\mathrm{\ρ}}_{\mathrm{gas}}}[2\mathrm{\φ}\left(H_2\right)+\mathrm{\Σn\φ}\left(C_m{H}_n\right)]$

${\left(O_{\mathrm{ar}}\right)}_{\mathrm{gas}}=\frac{0.715}{{\mathrm{\ρ}}_{\mathrm{gas}}}[\mathrm{\φ}\left(\mathrm{CO}\right)+2\mathrm{\φ}\left({\mathrm{CO}}_2\right)+2\mathrm{\φ}\left(O_2\right)]$

${\left(N_{\mathrm{ar}}\right)}_{\mathrm{gas}}=\frac{1.25}{{\mathrm{\ρ}}_{\mathrm{gas}}}\mathrm{\φ}\left(N_2\right)$

In formula, (C _ar) _gas, (H _ar) _gas, (O _ar) _gas, (N _ar) _gasbe respectively the mass content percent of the blast furnace gas as received basis carbon after conversion, the mass content percent of blast furnace gas as received basis protium, the mass content percent of blast furnace gas as received basis oxygen element, the mass content percent of blast furnace gas as received basis nitrogen element, unit is %.

It should be noted that, because blast furnace gas sulfur content is considerably less, almost can ignore, the element sulphur content (S after therefore converting _ar) _gascan be by zero processing; Equally, the dust content of blast furnace gas is lower, and especially for current the most conventional gas dry-dedusting system, outlet dust content of gas only has 2～5mg/m ³, the ash content (A after therefore converting _ar) _gasalso can be by zero processing.

Step 4, calculates and is incorporated in advance stove Coal-fired capacity B _cthe carbon mass content percent that under condition, fuel blend Actual combustion is fallen computing formula is: $C_{\mathrm{ar}}^r=C_{\mathrm{ar}}-\frac{A_{\mathrm{ar}}}{100}[\frac{r_{1z}{C}_{1z}^C}{100-C_{1z}^C}+\frac{r_{\mathrm{fh}}{C}_{\mathrm{fh}}^C}{100-C_{\mathrm{fh}}^C}],$ Wherein for the carbon mass content percent that fuel blend Actual combustion is fallen, unit is %; r _lz, r _fhthe ash amount in slag, flying dust that is respectively accounts for the always share of ash amount of fire coal, and unit is %, and general employing is artificially set, and is taken as respectively 85% and 15%; be respectively boiler slag carbon content, unburned carbon in flue dust, unit is %.

Step 5, calculates and is incorporated in advance stove Coal-fired capacity B _cfuel blend characteristic coefficient β under condition.

Computing formula is: $\mathrm{\β}=2.35\frac{H_{\mathrm{ar}}-0.126O_{\mathrm{ar}}+0.038N_{\mathrm{ar}}}{C_{\mathrm{ar}}^r+{0.375S}_{\mathrm{ar}}},$

Wherein β is fuel blend characteristic coefficient, H _ar, O _ar, N _arand S _arbe respectively fuel blend as received basis protium mass content percent, fuel blend as received basis oxygen element mass content percent, fuel as received basis nitrogen element mass content percent and fuel blend as received basis element sulphur mass content percent, unit is %.

Step 6, calculates and is incorporated in advance stove Coal-fired capacity B _cthree atomic gas volume content percent φ ' under condition in dry flue gas _js(RO ₂).

Computing formula is: ${\mathrm{\φ}}_{\mathrm{js}}^{\′}\left({\mathrm{RO}}_2\right)=\frac{21-{\mathrm{\φ}}^{\′}\left(O_2\right)-(0.605+\mathrm{\β}){\mathrm{\φ}}^{\′}\left(\mathrm{CO}\right)}{1+\mathrm{\β}},$

Wherein φ ' is (CO) the percentile measured value of volume content of CO in described dry flue gas, and unit is %; φ ' (O ₂) be O in described dry flue gas ₂the percentile measured value of volume content, unit is %.

Step 7, will be incorporated into stove Coal-fired capacity B in advance _cunder condition, calculate described three atomic gas volume content percent φ ' _js(RO ₂) with step 1 in the percentile measured value φ ' of three atomic gas volume content (RO in the dry flue gas that obtains to smoke sampling and after analyzing ₂) compare, if the difference of the two exceedes predictive error scope, will as the new predetermined stove Coal-fired capacity B that enters _c, re-execute step 3 to step 7, until obtain φ ' _js(RO ₂) and φ ' (RO ₂) difference within the scope of predictive error, determine the final predetermined stove Coal-fired capacity B that enters _center stove Coal-fired capacity for required.

The measuring method that enters stove Coal-fired capacity of coal dust of the present invention and blast furnace gas multi-fuel fired boiler, by being incorporated in advance the dry flue gas compositional data of obtaining under stove Coal-fired capacity condition and the dry flue gas compositional data that analysis obtains to smoke sampling compares, if both differences are relatively outside predictive error scope, adjust and recalculate entering stove Coal-fired capacity, until both differences are within the scope of predictive error, thereby determine the final stove Coal-fired capacity that enters, overcome the difficulty that the boiler that configures the ball type pulverizer system in prior art cannot accurate measurement enters stove Coal-fired capacity, thereby make coal dust and the measuring and calculating of the blast furnace gas multi-fuel fired boiler thermal efficiency smooth.

Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.

Claims (7)

1. a measuring method that enters stove Coal-fired capacity for coal dust and blast furnace gas multi-fuel fired boiler, is characterized in that, described measuring method comprises:

Step 1, obtains input parameter, and described input parameter at least comprises dry flue gas parameter, the percentile measured value φ ' of the volume content (RO that described dry flue gas parameter at least comprises three atomic gas in dry flue gas ₂);

Step 2, predetermined one enters stove Coal-fired capacity B _c;

Step 3, calculates the described stove Coal-fired capacity B that is incorporated in advance _cthe performance data of the fuel blend under condition;

Step 4, calculates the described stove Coal-fired capacity B that is incorporated in advance _cthe carbon mass content percent that fuel blend Actual combustion under condition is fallen;

Step 5, calculates the described stove Coal-fired capacity B that is incorporated in advance _cfuel blend characteristic coefficient under condition;

Step 6, calculates the described stove Coal-fired capacity B that is incorporated in advance _cthe volume content percent φ ' of three atomic gas in dry flue gas under condition _js(RO ₂);

Step 7, by the volume content percent φ ' of three atomic gas in the described dry flue gas calculating _js(RO ₂) with described dry flue gas in the percentile measured value φ ' of the volume content (RO of three atomic gas ₂) compare, if the difference of the two exceedes predictive error scope, will as the new stove Coal-fired capacity B that is incorporated in advance _c, then re-execute step 3～step 7, until calculate φ ' _js(RO ₂) and φ ' (RO ₂) difference within the scope of predictive error, determine the final stove Coal-fired capacity B that is incorporated in advance _center stove Coal-fired capacity B as reality _c.

2. the measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler according to claim 1, is characterized in that,

Described input parameter also comprises performance data, the lime-ash parameter of coal-fired performance data, blast furnace gas and enters stove blast furnace gas flow;

The performance data of described fire coal comprises coal-fired as received basis ash content mass content percent, coal-fired as received basis carbon mass content percent, coal-fired as received basis protium mass content percent, coal-fired as received basis oxygen element mass content percent, coal-fired as received basis nitrogen element mass content percent and coal-fired as received basis element sulphur mass content percent;

The performance data of described blast furnace gas comprises volume content percent, the H of the CO in blast furnace gas ₂volume content percent, CO ₂volume content percent, N ₂volume content percent, O ₂volume content percent, hydrocarbon C _mh _nvolume content percent and the volume content percent of moisture;

Described lime-ash parameter comprises unburned carbon in flue dust and boiler slag carbon content;

Described dry flue gas parameter also comprises O in dry flue gas ₂the percentile measured value of volume content, the percentile measured value of volume content of CO;

The performance data of described fuel blend comprises fuel blend as received basis ash content mass content percent, fuel blend as received basis carbon mass content percent, fuel blend as received basis protium mass content percent, fuel blend as received basis oxygen element mass content percent, fuel blend as received basis nitrogen element mass content percent, fuel blend as received basis element sulphur mass content percent.

3. the measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler according to claim 2, is characterized in that, the calculating general formula of the performance data of described fuel blend is

y _i＝b _coalx _coal,i+b _gasx _gas,i，

Wherein y _ifor the performance data of described fuel blend, b _coal, b _gasbe respectively coal-fired consumption and blast furnace gas consumption and account for the share of fuel blend consumption, x _{coal, i}, x _{gas, i}be respectively the coal-fired performance data corresponding with the performance data of fuel blend and the performance data of blast furnace gas;

B _coal, b _gascomputing formula be respectively: $b_{\mathrm{coal}}=\frac{B_c}{B_c+B_g/{\mathrm{\ρ}}_{\mathrm{gas}}},b_{\mathrm{gas}}=\frac{B_g/{\mathrm{\ρ}}_{\mathrm{gas}}}{B_c+B_g/{\mathrm{\ρ}}_{\mathrm{gas}}},$ Wherein B _cfor described enter stove Coal-fired capacity, B _gdescribed under standard state, enter stove blast furnace gas flow, ρ _gasfor the density of blast furnace gas under standard state.

4. the measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler according to claim 3, is characterized in that the density p of blast furnace gas under described standard state _gascomputing formula be

ρ _gas=0.0125 φ (CO)+0.0009 φ (H ₂)+∑ (0.0054m+0.00045n) φ (C _mh _n)+0.0196 φ (CO ₂)+0.0125 φ (N ₂)+0.0143 φ (O ₂)+0.008 φ (H ₂o), wherein φ (CO), φ (H ₂), φ (CO ₂), φ (N ₂), φ (O ₂), φ (C _mh _n), φ (H ₂o) be respectively volume content percent, the described H of CO described in the performance data of described blast furnace gas ₂volume content percent, described CO ₂volume content percent, described N ₂volume content percent, described O ₂volume content percent, described hydrocarbon C _mh _nvolume content percent and the volume content percent of described moisture.

5. the measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler according to claim 4, is characterized in that, the percentile computing formula of carbon mass content that described fuel blend Actual combustion is fallen is

$C_{\mathrm{ar}}^r=C_{\mathrm{ar}}-\frac{A_{\mathrm{ar}}}{100}[\frac{r_{1z}{C}_{1z}^C}{100-C_{1z}^C}+\frac{r_{\mathrm{fh}}{C}_{\mathrm{fh}}^C}{100-C_{\mathrm{fh}}^C}],$

Wherein, for the carbon mass content percent that described fuel blend Actual combustion is fallen, C _ar, A _arbe respectively described fuel blend as received basis carbon mass content percent and described fuel blend as received basis ash content mass content percent, r _lz, r _fhthe ash amount in slag, flying dust that is respectively accounts for the coal-fired always share of grey amount, for described boiler slag carbon content, for described unburned carbon in flue dust.

6. the measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler according to claim 5, is characterized in that, the computing formula of described fuel blend characteristic coefficient is

$\mathrm{\β}=2.35\frac{H_{\mathrm{ar}}-0.126O_{\mathrm{ar}}+0.038N_{\mathrm{ar}}}{C_{\mathrm{ar}}^r+{0.375S}_{\mathrm{ar}}},$

Wherein, β is described fuel blend characteristic coefficient, H _ar, O _ar, N _arand S _arbe respectively described fuel blend as received basis protium mass content percent, described fuel blend as received basis oxygen element mass content percent, described fuel blend as received basis nitrogen element mass content percent and described fuel blend as received basis element sulphur mass content percent.

7. the measuring method that enters stove Coal-fired capacity of coal dust and blast furnace gas multi-fuel fired boiler according to claim 6, is characterized in that the volume content percent φ ' of three atomic gas in dry flue gas _js(RO ₂) computing formula be wherein β is described fuel blend characteristic coefficient, and φ ' is (CO) the percentile measured value of volume content of CO in described dry flue gas, φ ' (O ₂) be O in described dry flue gas ₂the percentile measured value of volume content.