JPS6170442A - Instrument for analyzing composition of waste combustion gas - Google Patents

Abstract

PURPOSE:To reduce the cost of an analyzing instruments and to improve the reliability thereof by detecting the concn. of O2 and CO2 in a waste combustion gas, incorporating the detected concn. values into the specific equation and determining the concn. of N2 and the concn. of H2O by computation. CONSTITUTION:Fuel is burned in a combustion furnace and the waste gas is supplied to an O2 concn. detector and CO2 concn. detector, by which the concns. thereof are detected. The O2 concn. value and CO2 concn. value obtd. by the detectors are substd. into the equation I, the equation II (where (a) and (b) are the values of CO2 and H2 in the waste combustion gas during combustion by the supply of theoretical air amt. for each 1kg of the fuel, m<3>/kg). The concn. of N2 and the concn. of H2O are determined by the arithmetic processing. The concns. of the O2, CO2, N2 and H2O are respectively displayed on a display part. The concns. of the O2 and CO2 in the waste combustion gas are thus detected and the concns. of the N2 and H2O are determined by using such detected values and therefore there is no need for providing an N2 concn. detecting part and H2O concn. detecting part and the cost of the instrument is reduced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention measures the 0° concentration and CO2 concentration in combustion exhaust gas, performs predetermined calculation processing using these signals, and calculates the N and H2o concentrations. The present invention relates to an apparatus for analyzing the composition of combustion exhaust gas.

[Conventional technology]

A conventional combustion exhaust gas composition analyzer is configured to measure components of interest, for example, CO□, N20, N2, and 0°, using individual detection units and display them on a predetermined display unit.

In the above configuration, CO, N29,
Four components, N2 and 0, can be measured continuously and automatically.

[Problem that the invention seeks to solve]

The conventional combustion exhaust gas composition analyzer described above has a problem in that it is expensive because it includes detection sections for individual components of interest. Also, in general, ■ As a 2o detection section,
It is difficult to obtain a device that operates stably for a long period of time, and it is difficult for the N2 detection section to completely eliminate the influence of other components, resulting in a lack of reliability.

SUMMARY OF THE INVENTION Therefore, the present invention provides a combustion exhaust gas composition analyzer that is inexpensive and highly reliable.

[Means for solving problems]

The combustion exhaust gas composition analyzer of the present invention that solves the above problems includes a 0 concentration detection section that measures the 0□ concentration in the combustion exhaust gas, a CO concentration detection section that measures the CO concentration, and the It is equipped with a signal processing section that inputs the signal from the CO□O□ detection section and processes it based on the following arithmetic expression to obtain the N and H2o concentrations.

However, a and b are the CO2 and
The value o (m3/kg) [effect] is calculated to determine the N2 concentration and H2o concentration.

〔Example〕 The present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention. The combustion exhaust gas composition analyzer includes a zero concentration detection section 2 using a zirconia element installed in the combustion exhaust gas flow path of a combustion furnace 1, an infrared CO2 concentration detection section 3, and an Oa variation detection section 2.
2 concentration signal x1 and all 2 CO□ concentration signals of the CO3 concentration detection unit 5 are input, predetermined arithmetic processing is performed, and H2o concentration signal Y is obtained.
The signal processing section 4 outputs the concentration signal Y2, and the signals X□, N2, Y, and Y2 are inputted,
It has display means 9 for displaying N20° and N2 on display sections 5, 6, 7 and 8, respectively.

The signal processing unit 4 inputs the signal X□ and outputs N3
．． an arithmetic unit 10 that performs 21 arithmetic operations and outputs a signal x3;
A calculation unit 11 inputs signal x3, calculates X4=X3X (0, 79), and outputs signal x4; inputs signal X and signal x5 from means 13, which will be described later;
While calculating x4+x5, the signal processing unit 4 calculates the signal
and N2 are input, calculations are performed based on equations (1) and (2), and signals Y and Y2 are output. As a result, the H20 display section 7 of the display means 5 displays a numerical value corresponding to the signal Y□, and the N2 display section 8 displays a numerical value corresponding to the signal Y2. The numerical values on each of these display sections are as explained below.
20 concentration N2a degree.

According to combustion theory, the theoretical amount of air per 1 kg of fuel is A.

C in combustion exhaust gas during combustion by supplying [m3/kg]
O2, N20 and N2 are each a [m 7 kg],
The following explanation will be given assuming that they are b (m7 kg) and c (m7 kg).

Fuel x C kg/hr) and excess air A [: m/kg
], the amount of combustion exhaust gas V (m/hr) is
Equation (3) is obtained, and the excess air amount I (m/hr) is
The formula (4) is obtained.

V=((a+b+c)+(m-1)A)x(m
/hr) (3)I-(m-1)A-X
Cm /hr) (4>However, ■=A/A By the way, the body percentage of 0. and N2 in the air is o.21
: has an arithmetic unit 12 that outputs a signal Y2. Further, the signal processing unit 4 inputs the signal x2, and calculates that X5=X2x (c
/a) (However, Maro and C are constants set in advance as described later) and outputs a signal x5.
3 and input signals X2, N3 and N5, N6=x2
Arithmetic unit 1 that calculates +x3+x5 and outputs signal x6
4 and a calculation section 15 which inputs the signal x6, performs the calculation of Y□=1-N6, and outputs the signal Y□. That is, between the input and output signals in the signal processing section 4, equation (1) and (
2) The configuration is such that the relationship in equation 2) holds true.

IC Y2- 0.79 X -57H + 7 N2(2)
In the above configuration, the 0□ concentration detection section 2 outputs the signal X corresponding to the 02 concentration in the combustion exhaust gas, and the CO2 a
The degree detection unit 3 outputs a signal x2 corresponding to the CO3 concentration in the combustion exhaust gas. Accordingly, the 02 display section 5 of the display means 5 displays the Q2 concentration, and the Co2 display section 6 displays the CO concentration.

0.79, the amount of N2 in the excess air is N2 and 02
Amount l02 = 0.21 (m-1) AOx (m /hr
) (6) Therefore, each gas stage in the combustion exhaust gas becomes equations (7) to 00.

CO2', , , , , , a x (m /h
r ) (7) N2. ,,(0,79(m
-1)A0+c) x (m/hr) (
9) 02, , 0.21 (m-1) AoX (m
/hr) a.

In addition, a large amount of air y (m/hr) and N20z [m
/hr] is taken in, the amount of each gas is expressed by the α force formula or α
4 equations, and the total amount T (m/hr) of combustion gas becomes α equations.

Co , , , , , a x (m /hr
) α92° Therefore, the ratio (concentration) of Co2, N20, N2 and 0°
xCO2'YH20' YN2 and N02 are at
J to (to) formula -Xco=-! LL-αQ T YH20'' T From the α乃αO formula and the formula (2), the air y[:m/hr] is calculated as the formula (c). Also, the formula (1), 06), and 2) Using this to find N20 z Cm / br ), the Q-force formula is obtained.

Shiki Totoru. Also, from the α equations, equations (2) and equations 01), the total amount T (m/hr) of combustion gas is expressed as equation (c).

Similarly, 0 type, e? ″) From formula and (c), YN2
The equation (c) is obtained.

YN2° 21 xO2” a xCO2” Therefore, (
As is clear from the comparison of the formula (2) and (2), the K%02 concentration detection section 2 outputs the signal x1 corresponding to the o2 concentration x02, and the CO2 concentration detection section 3 outputs the signal x1 corresponding to the o2 concentration x02. , by outputting the signal x2 corresponding to the CO2 concentration, the output signal Y
H2° and the output signal Y2 represent the N2 concentration YN2, respectively.

FIG. 2 is a block diagram showing another embodiment of the present invention, and shows the structure of a control device for controlling N20 in the exhaust gas of a direct-fired drying furnace. N
0 concentration detection unit 2 and CO installed in the exhaust air passage of the 20-liter furnace 22
The output signals x1 and N2 of the second concentration detection section 3 are input, control calculations are performed, and the damper drive section 23 is operated using the output signals. ■2o concentration calculation controller 21
In the first stage, the arithmetic unit 10 shown in FIG. 1 is provided.

13, 14 and 15, and the input signals X□ and N
2 is used to perform processing based on equation (1) to obtain the signal Y, and perform control calculations using this signal Y as a measurement signal.

In the above configuration, the H2O temperature calculation controller 21 controls the N20 concentration of the drying oven to set the E[20a degrees of the drying oven to a predetermined value.

N20 thick You can understand and know the amount of evaporated water.

〔Effect of the invention〕

As described above, according to the combustion exhaust gas composition analyzer of the present invention, the 02 concentration and the C02 concentration in the combustion exhaust gas are measured, and predetermined calculation processing is performed using these signals to determine the N2 concentration and the N20 concentration. Since the N2 concentration detection section and N20! There is no need to provide a degree detection section. This makes the device less expensive and more reliable.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
It is a block diagram which shows another Example of this invention. 1... Combustion furnace, 2... Once detection unit, 3... CO
□Concentration detection unit, 4... Signal processing unit, 9... Display means, 21... 0° concentration calculation controller, 22... Drying oven,
23... Damper drive section. Figure 1

Claims (1)

[Claims] An O_2 concentration detection unit that measures the O_2 concentration in the combustion exhaust gas and a CO_2 concentration detection unit that measures the CO_2 concentration, and the signals of the O_2 concentration detection unit and the CO_2 concentration detection unit are input, and the following calculation is performed. A combustion exhaust gas composition analysis device comprising a signal processing unit that calculates N_2 concentration and H_2O concentration by performing processing based on equations. N_2 concentration = 0.79 x [O_2 concentration] / 0.21 + c
/a×[CO_2 concentration]H_2O concentration=1-{[O_2
Concentration]/0.21+(1+c/a) [CO_2 concentration]}
However, a and b are the values of CO_2 and H_2O in the combustion exhaust gas during combustion when the theoretical amount of air is supplied per 1 kg of fuel. [m^3/kg]