CN104087344B - A kind of entrained flow gasifying furnace bore temperature measuring method and system - Google Patents

Abstract

The invention discloses a kind of entrained flow gasifying furnace bore temperature measuring method and system.Wherein, entrained flow gasifying furnace bore temperature measuring method comprises: obtain the pressure of gasification furnace shock chamber, each fouling gas content after scrubbing tower rough purification; Suppose fire box temperature, according to this fire box temperature determination transformationreation equilibrium constant and the methanation reaction equilibrium constant; Determine water-gas ratio; Determine furnace pressure; Obtain the 3rd equilibrium constant; Judge whether the methanation reaction equilibrium constant and the 3rd equilibrium constant meet pre-conditioned, the invention has the advantages that and can carry out continuing to detect reliably to fire box temperature, avoid the potential safety hazard brought because thermopair is easy to damage in gasification.

Description

A kind of entrained flow gasifying furnace bore temperature measuring method and system

Technical field

The present invention relates to entrained flow bed gasification technology field, in particular to a kind of entrained flow gasifying furnace bore temperature measuring method and system.

Background technology

Along with the fast development of China's economic construction, the demand of the energy is also grown with each passing day.China is the country of the oil-poor weak breath of coal more than, but the exploitation of coal can bring serious environmental problem, and air-flow bed coal-gasification technique is that the clean efficiency utilization of coal provides a kind of possibility.The nucleus equipment of entrained flow bed gasification technology is gasification furnace, and gasification furnace generally comprises firing chamber (burner hearth) and shock chamber's two parts.Coal gasification course is: be injected in the firing chamber of gasification furnace by coal slurry or coal dust and oxygenant (oxygen, water etc.) with the form of jet, coal slurry or coal dust are in firing chamber combustion, in combustion process, the temperature of firing chamber reaches more than 1300 DEG C very soon, higher hydrocarbon in coal decomposes completely, the content of methane is also very low, can not produce tar-like substance.After the available gas that reaction generates and slag go out gasification furnace firing chamber, under entering gasification furnace shock chamber (for chilling process) liquid level, after shock chamber's water-bath washing, dedusting, make by the synthetic gas of water-vapo(u)r saturation (potpourri of carbon monoxide, hydrogen etc.), send gasification furnace, and then after scrubbing tower etc. washs further, form the fouling gas after rough purification.The unburnt carbon of part and non-flammable ash content in coal, at high temperature form slag and fall into the water-bath of gasification furnace shock chamber, slag rapid solidification, enter slag bath termly through gasification furnace lock hopper.

Generally speaking, gasification furnace combustion liner refractory brick or water-cooling wall, owing to carrying out under the high temperature of gasification more than 1300 DEG C, the temperature therefore in gasifier operation process controls particularly important, and can it is directly connected to gasification furnace the operation of long-term stability.If gasification temperature is too high, the refractory corrosion aggravation in gasification furnace, antiscour abrasive resistance significantly reduces, thus affect or shorten the serviceable life of fire resistive material, water-cooling wall, even burn out refractory liner, water-cooling wall coil pipe etc., cause system to stop production, affect the safe operation of device.

At present, entrained flow gasifying furnace thorax (firing chamber) owing to there is high temperature, high pressure, height wash away, the particular surroundings of high corrosion, general temperature measuring instrument is difficult to adapt to, therefore, fire box temperature in general, directly cannot measure, and the judgement in trend can only be done by the experience of operator.The main method that only a few measures burning indoor temperature installs thermopair on the inwall of firing chamber, because thermopair is directly installed in firing chamber, in firing chamber, high temperature is high wash away the effect of high corrosion environment under, thermopair very easily damages, the average life of thermopair was at 2-3 month, change the workload that thermopair not only increases staff continually, the long period that simultaneously also can affect gasification installation carries out, and greatly reduces effective production time.In addition, if thermopair damages in gasification, can not detect in real time the temperature of burner hearth, serious potential safety hazard will be brought.

Summary of the invention

In view of this, the present invention is intended to propose a kind of entrained flow gasifying furnace bore temperature measuring method and system, to solve in the direct metering system of thermopair, affects the problem of gasification monitoring because thermopair is easy to damage.

An aspect, the present invention proposes a kind of entrained flow gasifying furnace bore temperature measuring method, the method comprises the steps:

Step 1, the pressure of measurement gasification furnace shock chamber, the various fouling gas contents on dry basis x of scrubbing tower outlet after rough purification _i;

Step 2, supposes fire box temperature T, and determines transformationreation equilibrium constant K according to T _pwith methanation reaction equilibrium constant K _{f, CO};

Step 3, according to the x that step 1 records _iobtain mixed gas concentration and amass x _mixed, and according to x _mixed, transformationreation equilibrium constant K _pdetermine the water-gas ratio of burner hearth nearly cinder notch place gas

Step 4, according to the measured value determination furnace pressure P of step 1;

Step 5, according to furnace pressure P, the fire box temperature T supposed, gas contents on dry basis x that step 4 is determined _i, water-gas ratio obtain the fugacity f of various gas respectively _i, water fugacity f _water, then according to f _i, f _waterdetermine the 3rd equilibrium constant

Step 6 judges methanation reaction equilibrium constant K _{f, CO}with the 3rd equilibrium constant whether meet k is 0.1 ~ 0.001, if meet, then the fire box temperature T now supposed is defined as the Current Temperatures of burner hearth; If do not meet, then repeat step 2 to step 4, till meeting above-mentioned condition.

Further, step 1 also comprises measures cinder notch pressure reduction, and step 4 determines that the method for furnace pressure P is, using the pressure of shock chamber and cinder notch pressure reduction sum as furnace pressure P.

Further, in described step 2, determine transformationreation equilibrium constant K _pwith methanation reaction equilibrium constant K _{f, CO}method be, according to following formula determination transformationreation equilibrium constant K _p:

$\lg K_p=\frac{2183}{T}-0.09361\mathrm{lgT}+0.632\×{10}^{-3}T-1.08\×{10}^{-7}{T}^2-2.298,$ In formula, T is the fire box temperature of hypothesis;

According to following formula determination methanation reaction equilibrium constant K _{f, CO}:

${\mathrm{LgK}}_{f,\mathrm{CO}}=\frac{9862.5}{T}-8.3256\mathrm{LogT}+2.0738\×{10}^{-2}T-0.1843\×{10}^{-6}{T}^2+11.84,$ In formula, T is the fire box temperature of hypothesis.

Further, described step 3 is according to the water-gas ratio of nearly cinder notch place gas in following formula determination burner hearth

In above formula: for the nearly cinder notch place of gasification furnace burner hearth water-gas ratio; x _mixedfor incoagulability mixed gas concentration amasss; K _pfor the transformationreation equilibrium constant.

Further, step 4 determines that the method for furnace pressure P is, using the pressure of step 1 gasification furnace shock chamber as furnace pressure P.

Further, in step 5 according to f _i, f _waterdetermine the 3rd equilibrium constant method be 1. determine gas fugacity f _i: first adopt formula calculate y _i, recycling y _icalculate gas fugacity f _i, x _ithat adopt is CO, CH in the fouling gas of scrubbing tower outlet after rough purification ₄, H ₂contents on dry basis, y _irepresent the wet basis content of above-mentioned various inconduc, for the water-gas ratio of nearly cinder notch place gas in burner hearth, then according to formula calculate CO, CH respectively ₄, H ₂fugacity f _cO, in formula: for fugacity coefficient, P is furnace pressure;

2. water fugacity f is determined _water: first adopt formula calculate y _water, recycling y _watercalculate water outlet fugacity f _water, in formula, y _waterrepresent the wet basis content of water, then according to formula calculate fugacity, in formula: for fugacity coefficient, P is furnace pressure;

3., according to f _cO, f _waterdetermine the equilibrium constant computing method be:

Further, x _mixedcO in the fouling gas with the outlet of scrubbing tower after rough purification ₂, H ₂, CO contents on dry basis try to achieve, this formula is

Entrained flow gasifying furnace bore temperature measuring method in the present invention by obtaining the gas content in the pressure of gasification furnace shock chamber and burner hearth, and by series of computation, obtains the temperature value of gasification furnace burner hearth.Compared with the direct metering system of thermopair in prior art, the present invention does not need to arrange detecting instrument in the furnace wall of burner hearth, just can detect in real time fire box temperature, avoid due to thermocouple sheath outer wall dross and cause measurement delay and deviation, and the potential safety hazard being easy in gasification damage and bringing; Meanwhile, it also avoid and frequently change due to thermopair and affect gasification, increase the workload of operating personnel, reduce the problem of production efficiency.

On the other hand, the invention also discloses a kind of entrained flow gasifying furnace bore temperature measuring system, comprising:

Acquisition module, for obtaining the pressure measuring the gasification furnace shock chamber obtained, each fouling gas contents on dry basis x that scrubbing tower exports after rough purification _i;

First determination module, for supposing that fire box temperature is T, and determines transformationreation equilibrium constant K according to supposed fire box temperature T _pwith methanation reaction equilibrium constant K _{f, CO};

Second determination module, for the x obtained according to acquisition module _iobtain mixed gas concentration and amass x _mixed, and according to x _mixed, transformationreation equilibrium constant K _pdetermine the water-gas ratio of burner hearth nearly cinder notch place gas

3rd determination module, for the measured value determination furnace pressure P obtained according to acquisition module;

4th determination module, for according to furnace pressure P, the fire box temperature T supposed, gas contents on dry basis x _i, water-gas ratio obtain the fugacity f of various gas respectively _i, water fugacity f _water, then according to f _i, f _waterdetermine the 3rd equilibrium constant

Judge module, for judging methanation reaction equilibrium constant K _{f, CO}with the 3rd equilibrium constant whether meet relation, K is 0.1 ~ 0.001.

Described acquisition module can also obtain cinder notch pressure reduction, during the 3rd determination module determination furnace pressure, using the pressure of shock chamber and cinder notch pressure reduction sum as furnace pressure P.Adopt cinder notch pressure reduction, the degree of accuracy determining furnace pressure can be improved.

The invention also discloses measuring system, can by measuring method input system, entrained flow gasifying furnace bore temperature measuring method by obtaining the gas composition after the pressure of gasification furnace shock chamber and synthetic gas rough purification, and by series of computation, obtains the temperature value of gasification furnace burner hearth.Compared with the direct metering system of thermopair in prior art, the present invention does not need to arrange detecting instrument in the furnace wall of burner hearth, just can detect in real time fire box temperature, avoid due to thermocouple sheath outer wall dross and cause measurement delay and deviation, and the potential safety hazard being easy in gasification damage and bringing; Meanwhile, it also avoid and frequently change due to thermopair and affect gasification, increase the workload of operating personnel, reduce the problem of production efficiency.

Accompanying drawing explanation

The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is entrained flow gasifying furnace bore temperature measuring method process flow diagram of the present invention;

Fig. 2 is entrained flow gasifying furnace bore temperature measuring system schematic diagram of the present invention.

Embodiment

It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.

Measuring method embodiment:

Be entrained flow gasifying furnace bore temperature measuring method process flow diagram of the present invention see Fig. 1, Fig. 1.As shown in the figure, the method comprises the steps:

S1: step 1, the pressure of measurement gasification furnace shock chamber, the various fouling gas contents on dry basis x of scrubbing tower outlet after rough purification _i;

S2: step 2, supposes fire box temperature T, and determines transformationreation equilibrium constant K according to T _pwith methanation reaction equilibrium constant K _{f, CO}; Transformationreation equilibrium constant K _pform the equilibrium constant that (or dividing potential drop) represent, methanation reaction equilibrium constant K _{f, CO}the equilibrium constant represented with fugacity, transformationreation equilibrium constant K _pwith methanation reaction equilibrium constant K _{f, CO}and there is quantitative relation between fire box temperature T.It should be noted that, to those skilled in the art, when fire box temperature is determined, transformationreation equilibrium constant K _pwith methanation reaction equilibrium constant K _{f, CO}just can determine, specifically determine that mode is various, the present invention does not repeat them here.

S3: step 3, according to the x that step 1 records _iobtain mixed gas concentration and amass x _mixed, and according to x _mixed, transformationreation equilibrium constant K _pdetermine the water-gas ratio of burner hearth nearly cinder notch place gas

S4: step 4, according to the measured value determination furnace pressure P of step 1;

S5: step 5, according to furnace pressure P, the fire box temperature T supposed, gas contents on dry basis x that step 4 is determined _i, water-gas ratio obtain the fugacity f of various gas respectively _i, water fugacity f _water, then according to f _i, f _waterdetermine the 3rd equilibrium constant

S6: step 6 judges methanation reaction equilibrium constant K _{f, CO}with the 3rd equilibrium constant whether meet k is 0.1-0.001, if meet, then the fire box temperature T now supposed is defined as the Current Temperatures of burner hearth; If do not meet, then repeat step 2 to step 4, till meeting above-mentioned condition.

Preferably, step 1 also comprises measures cinder notch pressure reduction, and step 4 determines that the method for furnace pressure P is, using the pressure of shock chamber and cinder notch pressure reduction sum as furnace pressure P.In above-described embodiment, the pressure of gasification furnace shock chamber equals the pressure of burner hearth, because the gas after gasification can cause the change of gaseous tension in the process being entered shock chamber by burner hearth, approximately can produce certain error so above-mentioned, and then affect the accuracy of fire box temperature measurement.In order to address this problem, can also be further improved above-described embodiment: step S1 also obtains cinder notch pressure reduction (pressure differential between gasification furnace burner hearth and shock chamber); In step S4, the force value of shock chamber and the pressure differential sum between gasification furnace burner hearth and shock chamber are defined as furnace pressure.It should be noted that, when specifically implementing, also need to obtain local atmospheric pressure, to obtain the absolute pressure of gasification furnace burner hearth.The present embodiment is revised by the pressure (definitely) of pressure differential to shock chamber between gasification furnace burner hearth and shock chamber, and revised force value closer to the current pressure of burner hearth, and then improves the accuracy of fire box temperature measurement.

In described step 2, determine transformationreation equilibrium constant K _pwith methanation reaction equilibrium constant K _{f, CO}method be, according to following formula determination transformationreation equilibrium constant K _p:

$\lg K_p=\frac{2183}{T}-0.09361\mathrm{lgT}+0.632\×{10}^{-3}T-1.08\×{10}^{-7}{T}^2-2.298,$

In formula, T is the fire box temperature of hypothesis; In this formula, T represents fire box temperature.It should be noted that, this formula experimentally data matching obtains, and can find in reference books, computing method are comparatively simple.

According to following formula determination methanation reaction equilibrium constant K _{f, CO}:

${\mathrm{LgK}}_{f,\mathrm{CO}}=\frac{9862.5}{T}-8.3256\mathrm{LogT}+2.0738\×{10}^{-2}T-0.1843\×{10}^{-6}{T}^2+11.84,$

In formula, T is the fire box temperature of hypothesis.It should be noted that, the present embodiment just schematically illustrates transformationreation equilibrium constant K _pwith methanation reaction equilibrium constant K _{f, CO}the representation of computing formula, other representations can found in reference books for those skilled in the art also should within protection scope of the present invention.

Step 3 is according to the water-gas ratio of nearly cinder notch place gas in following formula determination burner hearth

In above formula: for the nearly cinder notch place of gasification furnace burner hearth water-gas ratio; x _mixedfor incoagulability mixed gas concentration amasss; K _pfor the transformationreation equilibrium constant.

Concrete, x _mixedcO in the fouling gas with the outlet of scrubbing tower after rough purification ₂, H ₂, CO contents on dry basis try to achieve, this formula is specifically, burner hearth nearly cinder notch place gas generally comprises carbon dioxide, hydrogen, carbon monoxide and methane etc., because gasification in-furnace temperature is higher, so directly can not measure the gas composition in gasification furnace; In fact, gasification furnace combustor tail (going out gasification furnace burner hearth nearly cinder notch place) gas componant forms identical with the butt of the gas after scrubbing tower rough purification, thus the present embodiment using the contents on dry basis of each gas after scrubbing tower rough purification as burner hearth nearly cinder notch place gas contents on dry basis.During concrete enforcement, above-mentioned formulae discovery is adopted to make computing method simple.

According to f in step 5 _i, f _waterdetermine the 3rd equilibrium constant method be 1. determine gas fugacity f _i: first adopt formula calculate y _i, recycling y _icalculate gas fugacity f _i, x _ithat adopt is CO, CH in the fouling gas of scrubbing tower outlet after rough purification ₄, H ₂contents on dry basis py _irepresent the wet basis content of above-mentioned various inconduc, for the water-gas ratio of nearly cinder notch place gas in burner hearth, then according to formula calculate CO, CH respectively ₄, H ₂fugacity f _cO, in formula: for fugacity coefficient, P is furnace pressure;

2. water fugacity f is determined _water: first adopt formula calculate y _water, recycling y _watercalculate water outlet fugacity f _water, in formula, y _waterrepresent the wet basis content of water, then according to formula calculate fugacity, in formula: for fugacity coefficient, P is furnace pressure;

3., according to f _cO, f _waterdetermine the equilibrium constant computing method be:

During concrete enforcement, can furnace pressure, the fire box temperature T supposed, each fouling gas wet basis content and liquid water content be brought into state equation and fugacity computing formula, obtain the fugacity of various gas and water.It should be noted that, state equation and fugacity computing formula are conventionally known to one of skill in the art, and selection mode is various, and the present invention will not enumerate at this; In addition, the fugacity according to various gas and water determines that the method for the 3rd equilibrium constant is also for conventionally known to one of skill in the art, therefore does not repeat.

Particularly, the fugacity of each gas and water can be calculated according to actual mixed gas RK state equation and associated hot force equation:

According to fugacity computing formula calculate the fugacity of each component in fouling gas; In this formula: f _ifor the fugacity of component (gas) a certain in mixed gas; for the fugacity coefficient of component a certain in mixed gas, can be calculated by following formula:

Z=PV/RT, all the other each calculation method of parameters are as follows:

$P=\frac{\mathrm{RT}}{V-b}-\frac{a}{T^{1/2}V(V+b)}$

$a=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{y}_i{y}_i{a}_{\mathrm{ij}},b=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{y}_i{b}_i$

a _ij=(a _ia _j) ^0.5(1-k _ij)

In various above, P is furnace pressure; T is the fire box temperature of hypothesis, and i represents each component numbering in burner hearth nearly cinder notch place gas, i=CO, CO ₂, CH ₄, H ₂deng; a _i, a _jrepresent a constant of two kinds of different components, reference books can be consulted and obtain; k _ijbe two kinds of component cross action coefficients, can reference books be consulted, b _ican consult reference books equally, N represents component number in gas; y _i, y _jfor certain two kinds of component content in the gas at the nearly cinder notch place of gasification furnace burner hearth, by RK equation, calculate V value, by P, T, V and above-mentioned By consulting literatures obtains or the numerical value that calculates substitutes into fugacity coefficient computing formula, again the fugacity coefficient obtained is substituted into the computing formula of fugacity, the fugacity of each component can be obtained.

It should be noted that, state equation in the present embodiment, except above-mentioned RK equation, can also select other state equations well known to those skilled in the art, such as virial equation, Peng-Robinson equation etc., the present invention does not do any restriction to the concrete form of state equation.

Can find out, the entrained flow gasifying furnace bore temperature measuring method in the present invention by obtaining the gas composition after the pressure of gasification furnace shock chamber and synthetic gas rough purification, and by series of computation, obtains the temperature value of gasification furnace burner hearth.Compared with the direct metering system of thermopair in prior art, the present invention does not need to arrange detecting instrument in the furnace wall of burner hearth, just can detect in real time fire box temperature, safe operation for gasification furnace provides most important control foundation, avoid due to thermocouple sheath outer wall dross and cause measurement delay and deviation, and the potential safety hazard being easy in gasification damage and bringing; Meanwhile, it also avoid and frequently change due to thermopair and the problem that affects gasification, increase operating personnel workload, reduce production efficiency.

Generally speaking, gasification furnace realizes the robotization of process units by DCS control system, its instrument measurement data by collection site equipment pipe is installed, through calculating, issue instructions on the valve positioner of valve, give the certain switch of valve or valve position conditioning signal, to change valve opening, realize automatically controlling.In the present embodiment, the instrument for gathering shock chamber's pressure is arranged on airflow bed gasification furnace shock chamber or goes out shock chamber's synthetic gas pipeline, and the instrument for detecting furnace gas contents on dry basis is arranged on charcoal and washes tower (scrubbing tower) top synthetic gas pipeline.

Be described in detail below in conjunction with the preferred embodiment of accompanying drawing to measuring method of the present invention:

Carbon dioxide butt content in the gas that gather the pressure values (force value) of shock chamber, the pressure difference (pressure differential) between gasification furnace burner hearth and shock chamber and rough purification from the Distributed Control System (DCS) (DistributedControlSystem is called for short DCS) of gasification installation after, scrubbing tower exports carbon monoxide contents on dry basis x _cO, hydrogen contents on dry basis with methane contents on dry basis deng.Then obtained the fire box temperature of gasification furnace by Calculation of chemical equilibrium, concrete computation process is:

Suppose a fire box temperature T, and bring the fire box temperature T of hypothesis into formula

$\lg K_p=\frac{2183}{T}-0.09361\mathrm{lgT}+0.632\×{10}^{-3}T-1.08\×{10}^{-7}{T}^2-2.298,$ Obtain the transformationreation equilibrium constant K represented with dividing potential drop _p;

Bring the fire box temperature T of hypothesis into formula again:

${\mathrm{LgK}}_{f,\mathrm{CO}}=\frac{9862.5}{T}-8.3256\mathrm{LogT}+2.0738\×{10}^{-2}T-0.1843\×{10}^{-6}{T}^2+11.84,$ Obtain the methanation reaction equilibrium constant K represented with fugacity _{f, CO};

Then by each gas contents on dry basis x _cO, with transformationreation equilibrium constant K _pbring formula into: obtain the water-gas ratio of gas

The pressure of Zai Ling gasification furnace shock chamber and the pressure differential sum between gasification furnace burner hearth and shock chamber are defined as the current pressure of burner hearth; After scrubbing tower, the contents on dry basis of each component is converted into the wet basis content of corresponding component on the nearly cinder notch of burner hearth by following formula: in formula, y _irepresent the wet basis content of each component in gas, x _ieach component contents on dry basis in the gas of scrubbing tower outlet after rough purification, i represents each component in gas, i=CO, CO ₂, CH ₄, H ₂..The wet basis content of the current pressure of burner hearth, temperature, each component is substituted into state equation and fugacity computing formula, obtains carbon monoxide fugacity f _cO, hydrogen fugacity methane fugacity with water fugacity f _waterdeng; Bring the above-mentioned fugacity obtained into formula again: obtain the 3rd equilibrium constant represented with fugacity

Order if | l-1|≤0.001, then determine that the fire box temperature T supposed is the Current Temperatures of burner hearth; If | l-1| > 0.001, then again suppose fire box temperature T, and repeat the above-mentioned steps calculating methanation reaction equilibrium constant and the 3rd equilibrium constant, till the methanation reaction equilibrium constant and the 3rd equilibrium constant meet above-mentioned condition, and when determining to meet pre-conditioned, the fire box temperature T of hypothesis is the Current Temperatures of burner hearth.

Airflow bed gasification furnace alleged by the present embodiment comprises with the gasification furnace of dry pulverized coal charging, with the gasification furnace of coal water mixture charging, even heavy oil residual oil is the gasification furnace of raw material, burner hearth can adopt refractory brick, water-cooling wall, and gasification furnace firing chamber gas out can adopt chilling process and pot destroying process.

To sum up, the present invention does not need to arrange detecting instrument in the furnace wall of burner hearth, just can detect in real time fire box temperature, avoid due to thermocouple sheath outer wall dross and cause measurement delay and deviation, and the potential safety hazard being easy in gasification damage and bringing; Meanwhile, it also avoid and frequently change due to thermopair and affect gasification, increase the workload of operating personnel, reduce the problem of production efficiency.

Measuring system embodiment, with reference to Fig. 2,

A kind of entrained flow gasifying furnace bore temperature measuring system, comprising:

Acquisition module, for obtaining the pressure measuring the gasification furnace shock chamber obtained, each fouling gas contents on dry basis x that scrubbing tower exports after rough purification _i;

First determination module, for supposing that fire box temperature is T, and determines transformationreation equilibrium constant K according to supposed fire box temperature T _pwith methanation reaction equilibrium constant K _{f, CO};

Second determination module, for the x obtained according to acquisition module _iobtain mixed gas concentration and amass x _mixed, and according to x _mixed, transformationreation equilibrium constant K _pdetermine the water-gas ratio of burner hearth nearly cinder notch place gas

3rd determination module, for the measured value determination furnace pressure P obtained according to acquisition module;

4th determination module, for according to furnace pressure P, the fire box temperature T supposed, gas contents on dry basis x _i, water-gas ratio obtain the fugacity f of various gas respectively _i, water fugacity f _water, then according to f _i, f _waterdetermine the 3rd equilibrium constant

Judge module, for judging methanation reaction equilibrium constant K _{f, CO}with the 3rd equilibrium constant whether meet relation, K is 0.1-0.001.

Described acquisition module can also obtain cinder notch pressure reduction, during the 3rd determination module determination furnace pressure, using the pressure of shock chamber and cinder notch pressure reduction sum as furnace pressure P.

It should be noted that, the gasification furnace fire box temperature measuring method in the present invention is identical with gasification furnace fire box temperature measuring principle, and relevant part can be cross-referenced.The formula adopted in the middle of method etc. in input system, can perform calculating by program.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. an entrained flow gasifying furnace bore temperature measuring method, is characterized in that: the method comprises the steps:

Step 1, the pressure of measurement gasification furnace shock chamber, the various fouling gas contents on dry basis x of scrubbing tower outlet after rough purification _i;

Step 2, supposes fire box temperature T, and determines transformationreation equilibrium constant K according to T _pwith methanation reaction equilibrium constant K _{f, CO};

Step 3, according to the x that step 1 records _iobtain mixed gas concentration and amass x _mixed, and according to the water-gas ratio of nearly cinder notch place gas in following formula determination burner hearth

In above formula: for the water-gas ratio at the nearly cinder notch place of gasification furnace burner hearth; x _mixedfor incoagulability mixed gas concentration amasss; K _pfor the transformationreation equilibrium constant; Wherein, x _mixedcO in the fouling gas with the outlet of scrubbing tower after rough purification ₂, H ₂, CO contents on dry basis try to achieve, this formula is

Step 4, using the pressure of step 1 gasification furnace shock chamber as furnace pressure P;

Step 5, the furnace pressure P, the fire box temperature T supposed that determine according to step 4, various fouling gas contents on dry basis x _i, water-gas ratio obtain the fugacity f of various gas respectively _i, water fugacity f _water, then according to f _i, f _waterdetermine the 3rd equilibrium constant specific as follows:

1. gas fugacity f is determined _i: first adopt formula calculate y _i, recycling y _icalculate gas fugacity f _i, x _ithat adopt is CO, CH in the fouling gas of scrubbing tower outlet after rough purification ₄, H ₂contents on dry basis, y _irepresent the wet basis content of above-mentioned various inconduc, for the water-gas ratio of nearly cinder notch place gas in burner hearth, then according to formula calculate CO, CH respectively ₄, H ₂fugacity f _cO, in formula: for fugacity coefficient, P is furnace pressure;

2. water fugacity f is determined _water: first adopt formula calculate y _water, recycling y _watercalculate water outlet fugacity f _water, in formula, y _waterrepresent the wet basis content of water, then according to formula calculate fugacity, in formula: for fugacity coefficient, P is furnace pressure;

3. basis f _cO, f _waterdetermine the equilibrium constant computing method be:

Step 6 judges methanation reaction equilibrium constant K _{f, CO}with the 3rd equilibrium constant whether meet k is 0.1 ~ 0.001, if meet, then the fire box temperature T now supposed is defined as the Current Temperatures of burner hearth; If do not meet, then repeat step 2 to step 4, till meeting above-mentioned condition.

2. entrained flow gasifying furnace bore temperature measuring method according to claim 1, it is characterized in that, step 1 also comprises measures cinder notch pressure reduction, and such step 4 determines that the method for furnace pressure P is just, using the pressure of shock chamber and cinder notch pressure reduction sum as furnace pressure P.

3. entrained flow gasifying furnace bore temperature measuring method according to claim 1, is characterized in that,

In described step 2, determine transformationreation equilibrium constant K _pwith methanation reaction equilibrium constant K _{f, CO}method be, according to following formula determination transformationreation equilibrium constant K _p: ${\mathrm{lgK}}_p=\frac{2183}{T}-0.09361\lg T+0.632\×{10}^{-3}T-1.08\×{10}^{-7}{T}^2-2.298,$

In formula, T is the fire box temperature of hypothesis;

According to following formula determination methanation reaction equilibrium constant K _{f, CO}: ${\mathrm{LgK}}_{f,CO}=\frac{9862.5}{T}-8.3256LogT+2.0738\×{10}^{-2}T-0.1843\×{10}^{-6}{T}^2+11.84,$

In formula, T is the fire box temperature of hypothesis.

4. an entrained flow gasifying furnace bore temperature measuring system, is characterized in that: comprising:

Acquisition module, for obtaining the pressure measuring the gasification furnace shock chamber obtained, each fouling gas contents on dry basis x that scrubbing tower exports after rough purification _i;

First determination module, for supposing that fire box temperature is T, and determines transformationreation equilibrium constant K according to supposed fire box temperature T _pwith methanation reaction equilibrium constant K _{f, CO};

Second determination module, for the x obtained according to acquisition module _iobtain mixed gas concentration and amass x _mixed, and according to x _mixed, transformationreation equilibrium constant K _pdetermine the water-gas ratio of burner hearth nearly cinder notch place gas

3rd determination module, for the measured value determination furnace pressure P obtained according to acquisition module;

4th determination module, for according to furnace pressure P, the fire box temperature T supposed, gas contents on dry basis x _i, water-gas ratio obtain the fugacity f of various gas respectively _i, water fugacity f _water, then according to f _i, f _waterdetermine the 3rd equilibrium constant

Judge module, for judging methanation reaction equilibrium constant K _{f, CO}with the 3rd equilibrium constant whether meet relation, K is 0.1 ~ 0.001.

5. entrained flow gasifying furnace bore temperature measuring system according to claim 4, it is characterized in that, described acquisition module can also obtain cinder notch pressure reduction, during the 3rd determination module determination furnace pressure, using the pressure of shock chamber and cinder notch pressure reduction sum as furnace pressure P.