JPS5923815A - Device for producing atmosphere gas - Google Patents

Abstract

PURPOSE:To provide a titled production device by which an atmosphere gas having a prescribed concn. of CO over a wide range is obtained even if there is a fluctuation in the consumption, etc. of the atmosphere gas and the concn. of CO fluctuates by controlling the fluctuation in the concn. of CO in the atmosphere gas by adjusting the addition rate of an endothermic type gas contg. much CO. CONSTITUTION:The gas formed by combustion from a combustion chamber 2 in an exothermic type gas production device 1 is subjected to cooling 3 then to removal 4 of H2O and CO2 by adsorption to make NX which is an exothermic type gas and is supplied into a mixer 5. On the other hand, a gaseous mixture composed of fuel such as methane, propane or the like and air is heated with a retort 9 contg. a catalyst in an endothermic gas production device 7, by which the gas is modified 8. The modified gas is cooled 10 and is supplied as an RX gas which is an endothermic gas to the mixer 5. The NX gas and RX gas are mixed in the mixer to form the atmosphere gas having a prescribed concn. of CO and said gas is supplied 6 to a heat treatment furnace, etc. A flow rate control valve 16 is controlled to open or close by the signal from a measuring device 17 for concn. of CO provided on the downstream of the part where a supply pipe 6 is communicated with a by-pass line 15, whereby the concn. of CO in the atmosphere gas in the pipe 6 is controlled to a prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an atmospheric gas production device, and more particularly to an atmospheric gas production device that can always ensure a stable CO content even if there is a change in consumption. .

When heat treating carbon steel and alloy steel, atmospheric gas is used, but in recent years, improvements in heat treatment technology and demands for quality have required strict control of the CO concentration of the atmospheric gas.

By the way, atmospheric gas is generated by a heat-generating gas generator fj'? In general, as shown in Figure 1, C in the atmospheric gas is
The O7 rate is based on the fact that the CO concentration tends to increase as the gas flow rate increases, as the adsorption capacity of the absorption tower fluctuates due to changes in the flow rate due to changes in the amount of gas used. It was extremely difficult to maintain a precise CO concentration at all times due to variations in adsorption capacity due to variations in type, quality, temperature, pressure, period of use, raw conditions of the agent, etc. .

In order to solve this problem, a method is being used to control the gas generation conditions by measuring the COa concentration in the atmospheric gas from the gas generator, but if it is necessary to increase the CO concentration, combustion Soot is generated in the generated gas, and the I2 concentration increases.

The present invention has been made in order to eliminate the drawbacks of the prior art as described in 1.1.
The atmosphere gas has a predetermined COa degree, and if the CO concentration in the atmosphere gas fluctuates due to changes in the amount of COa, etc., the produced gas from the endothermic gas generator 1q with a high COa degree is added from the bypass path to always maintain the optimum value. While controlling the concentration to 00,
An object of the present invention is to provide an atmospheric gas production device that saves energy by using a part of the combustion gas from an exothermic gas generator Wt as a heat source in a shift furnace of an endothermic gas generator 1 "11". It is something.

Finally, Kibatsu 1]I] will be explained with reference to a drawing which is an example.

In Fig. 2, reference numeral 1 denotes the exothermic gas generation capacity, which consists of a combustion chamber 2L for performing high-load combustion, a cooling tower 33 and a pumping device f: 4.4. "Garage generation"
After being cooled (the I20 and C02 are removed by the pumping device 4, the exothermic gas NX gas (CO: 1.8 kg, CO3,005 112° ■096, N2 remains)
and is supplied to the mixer 5.

7 is an endothermic gas generator, a shift furnace 8 and a cooler 10;
A mixed gas of fuel such as methane or propane and air is heated in a retort 9 containing a catalyst and transformed, and then cooled in a cooler 10 to produce R
CO: 24K II2: 33.4! ,16,CH4
: 0,496, CO2096, N2: remaining),
The mixture is supplied to the mixer 5. And mixer 5+if
The NX gas and the RX gas are mixed to form an atmospheric gas having a predetermined CO image concentration, which is supplied to a heat treatment furnace or the like through an atmospheric gas supply pipe 6.

In addition, 11 controls the mixing ratio of NX gas and RX gas.
12-Dehydrator.

Then, as a heat source for heating the retort 9 of the conversion furnace 8, a part of the combustion gas from the combustion chamber 2 is branched and supplied to the shift furnace 8, and after heating the retort 9, the combustion gas is converted to the combustion gas. Gas supply 4; 1 is co-supplied to IJ'J, 'ic! suction unit) H4 through 13 coolers 13a.

I read the Orf branch combustion generated gas Ji! Illusion and transmutation are 58
The flow rate control valve T14, which is opened and closed depending on the temperature of the converter 8.

1, 5 &;j A bypass path that bypasses the supply pipe 6 and the produced gas supply pipe from the dehydrator 12, and this bypass path 15 is provided with a CJ flow and iV1 control system 16.

1, a GO concentration measuring device 17 is provided downstream from the communication portion of the supply pipe 6 with the bypass path 15, and the flow rate device m
11 and 16 are (l-
Opening/closing is controlled by i'fJ.

JJ's skill and use of atmosphere gas! If the adsorption capacity of the adsorption device 4 fluctuates due to an increase in the CO concentration and the CO concentration becomes lower than a predetermined value, this
Detected by O concentration measuring device 17 and flow control 6111-16
is opened, and the CO concentration in the atmospheric gas in the supply pipe 6 is controlled to a predetermined value by controlling ω11. In addition, in actual operation, the output L1 flow 11j of the supply pipe 6 is set to ]00/
11, it is sufficient that the endothermic gas generator has 7 outputs [-1 flowmeter-20 doors/11 or less]. Similarly, if an atmospheric gas with a particularly high CO concentration is required, the endothermic gas generation/juice may be 50 nl/I+.

As is clear from the above explanation, according to the atmospheric gas production device according to the present invention, CO in the atmospheric gas? Anti-agriculture f!
Since +11I is controlled by adjusting the amount of endothermic gas added with a large amount of C0-hl, atmospheric gas is consumed.

There is gi in etc., and the GO concentration is strange! IIIJ and C can also reduce the atmospheric gas concentration to 1:1 over a wide range. In addition, the heat of the endothermic gas generator i”f +
JI:il This uses -1114 of the high-temperature combustion generated gas from the exothermic gas generator, and does not require heating fuel for the endothermic gas generator, so energy can be saved.

[Brief explanation of drawings]

Figure 1 is a graph showing the relationship between the Co concentration and the gas flow meter in an exothermic gas generator;・Exothermic gas generator M, 2... combustion 'ge, 3.
・・Cooling tower, 4・1 100 heads, 5・・Mixture 4.6・
...', 1y Surrounding gas supply pipe, 7... Endothermic gas generator l''1)゛, 8 ・Transformation furnace, 9... Retort, 10
・・・Cooler, 13...Combustion generated gas 1JIH pumping・
, i 3 a - Cooler, 15... Bypass path, 16
...Flow rate control valve, 17...CO concentration measuring device.

Claims (1)

[Claims] (1) Combustion chamber for high-load combustion, cooling tower and ") I
t, -i'f device i<t; an endothermic gas generator comprising a transformer power i and a cooler using part of the combustion generated gas from the combustion chamber as a heat source; a supply pipe that supplies the combustion generated gas used as a heat source of the conversion furnace to the ashstone device; a mixed island stagnation that mixes the generated gas exiting from both of the gas generators to form a predetermined atmospheric gas;
'J[I Measuring CO concentration in a mixed atmospheric gas C
an O concentration measuring device, a bypass path for supplying the generated gas from the endothermic gas generation device to the CO concentration measuring device, and a bypass path provided in this bypass path to
An atmospheric gas production device characterized by comprising: a flow barrier control valve controlled by a concentration measuring device;