JPS6024410Y2 - Mixed fuel gas calorific value adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mixed fuel gas calorific value adjusting device for mixing various raw material gases to produce a mixed gas having a constant calorific value and combustibility (combustion range).

It is known that in order to keep the amount of heat of the mixed gas constant, the flow rate of the raw material gas or the amount of air mixed into the mixed gas is adjusted.

In addition, Wl of the mixed gas (here, Wl is the Wotsube index, and Wotsube is the calorific value H of the gas divided by the square root of the specific gravity d of the gas (WI = H/, , /d). It is also known to control the flow rate ratio of the raw material gas in order to keep the amount constant.

Therefore, in order to adjust the calorific value and WI of the mixed gas, each of these adjusting devices may be installed, but whichever adjustment is performed will affect the calorific value or WI of the mixture gas.

Therefore, in order to do these things at the same time (together), it is necessary to devise measures to ensure that there is no mutual influence, or even if there is, it is minimal.

The present invention is proposed in view of this point, and when adjusting the calorific value or WI of the mixed gas, in the case of calorific value, WI,
In the case of WI, the purpose is to mutually and automatically correct the calorific value to stabilize the calorific value and flammability range of the mixed gas.

In order to achieve the above object, the present invention provides a mixer for mixing raw material gases having different properties sent from a plurality of raw material gas lines, and a flow rate measuring device and a flow rate meter respectively attached to the plurality of raw material gas lines. a control valve, a mixed gas line for sending out the mixed gas mixed in the mixer, a sampling device attached to the mixed gas line for detecting the heat amount and Wl of the mixed gas, and a heat amount adjustment device for the mixed gas. an air line for mixing air for use, an air flow measuring device and an air flow regulating valve attached to the air line, and controlling the air flow regulating valve based on a flow rate signal from the air flow measuring device. a flow rate controller for controlling the flow rate of each raw material gas based on a flow rate signal from a flow rate measuring device attached to each of the raw material gas lines, and a WI regulator of the sampling device. In order to correct the flow rate of the raw material gas passing through other raw material gas lines in response to the WI value sent from the WI value and the flow rate signal from the flow rate measuring device of the fixed raw material gas line, the flow rate is fixed. a flow rate ratio control device that sends a flow rate correction signal to a flow rate regulator that is not in use, and a correction device that corrects a flow rate control value of the mixed air from the flow rate value of each of the raw material gases and the calorific value of each of the raw material gases. and a corrector that receives the signal from the correction device and the heat value signal from the heat value regulator of the sampling device and sends a flow rate correction signal to the air flow rate regulator, and adjusts the heat amount of the mixed fuel gas. This paper proposes a device.

According to the above configuration, when there is a fluctuation in the amount of heat or WI in the mixed gas, the flow rate of the raw material gas and the amount of air added to the mixed gas are immediately and automatically corrected based on this fluctuation value, so that the amount of heat is stable. This makes it possible to supply a mixed gas with a combustible range.

An embodiment of the present invention will be described below based on the drawings.

In the figure, 1 is the LPG supply line (raw material gas line)
, 2 is NG supply line (raw material gas line), 3 is LP
Flow rate measuring device attached to supply line 1 of G, 4 is N
A flow rate measuring device attached to the supply line 2 of G; 5 a flow rate regulator for adjusting the flow rate of LPG based on the threshold value measured by the flow rate measuring device 3; 6 attached to the LPG supply line 1; This control valve is operated by the flow rate regulator 5.

7 is a flow rate regulator for adjusting the flow rate of NG based on the value measured by the flow rate measuring device 4; 8 is a supply line 2 for NG;
This control valve is operated by the flow rate regulator 7.

9 is the mixed gas (supply gas) after the raw material gas mixer 14
In order to adjust the calorific value of the mixed gas in the line 13, it is a supply line for air mixed into the mixed gas. An air flow rate regulator 11a for adjusting the amount of air is a corrector 12 of the air flow rate regulator 11 which inputs the correction value from the correction device 17 and the calorific value of the mixed gas.
is an air regulating valve installed in the air supply line 9 operated by the air flow regulator 11.

15 is a sampling device for detecting the calorific value and WI of the mixed gas, 15a is a WI regulator, 15b is a calorific value regulator,
16 is the WI detected by the sampling device 15 and N
17 is a flow rate ratio control device for determining the flow rate of LPG from the flow rate value of the G supply line 2; 17 is a correction value for the amount of air mixed in based on the flow rate values of LPG and NG and the calorific value of NG and the calorific value of LPG; This is a correction device that performs calculations and provides a correction signal to the corrector 11a.

18 is an NG heat input line to the correction device 17;
Reference numeral 9 designates an LPG heat amount input line, 20 a manual heat value setting input line, 21.22 a pressure detection device, and 23.24 a pressure adjustment device.

The present invention is based on the above-mentioned configuration, and its operation will be explained next. In the embodiment, the flow rate of NG is constant, and the LP
WI is adjusted by mixing G, and the calorific value of the mixed gas is adjusted by mixing air.If there is a change in the calorific value of the raw material gas NG, the calorific value of the mixed gas will change, so the sampling device 15 detects this change in heat amount and adjusts the heat amount regulator 15.
A signal is sent from b to the corrector 11a to adjust the flow rate of air, and as a result, the amount of heat of the mixed gas is adjusted.

Furthermore, when there is a change in the amount of heat of NG, there is also a change in WI.

Therefore, in order to return this change to the set value, the WI controller 15a
The detected WI value is sent to the flow rate ratio control device 16.

The flow rate ratio control device 16 performs calculations based on the NG flow rate value and the WI value, and provides a correction signal to the flow rate regulator 5 to correct the LPG flow rate control value.

Also, when the flow rate of LPG is adjusted, the amount of heat in the mixed gas changes, so in order to restore this change in amount of heat, the correction device 1 is used.
7 performs calculations using the flow values of LPG and NG and the heat amounts of LPG and NG as input, and provides a correction signal to the corrector 11a to adjust the amount of air.

Note that if the sampling device 15 detects the heat amount and Wl and the WI regulator 15a and the heat regulator 15b adjust the respective values at the same time, a mutual interference problem will occur. I've adjusted it to be slower.

The present invention adjusts the heat value and WI of the mixed gas based on the change in the heat value of NG as described above, and restores the change in the heat value of the mixed gas, the change in Wl, and the change in Wl based on the change in the heat value of the raw gas. It is possible to supply a mixed gas having a stable calorific value and a stable combustion range by adjusting the changes in the calorific value of the mixed gas generated due to the above.

In the embodiment, two types of raw material gases, LPG and NG, are used, but even if the number of raw material gases is increased beyond this, the basic configuration of the apparatus will not change.

Furthermore, when air is not used to adjust the calorific value of the mixed gas, one type of raw material gas is replaced with the air supply line 9.

Next, although it is theoretically possible to use a plurality of raw material gases to adjust the amount of heat and WI, it is practically preferable to use one source gas from the viewpoint of simplifying the apparatus.

Next, instead of correcting the heat amount adjustment value with Wl,
It is also possible to correct the adjustment value using the amount of heat.

[Brief explanation of the drawing]

The figure is a flow sheet showing an embodiment of the present invention. 1...-LPG supply line, 2...N
G supply line, 3, 4...Flow rate measuring device, 5,
7...Flow rate regulator, 6,8...Flow rate control valve, 9...Air supply line, 10...
...Air flow rate measuring device, 11...Air flow rate regulator, lla...Corrector, 12...Air flow rate control valve, 15...Sampling device , 16・
...Flow rate ratio control device, 17...Correction device.

Claims (1)

[Claims for Utility Model Registration] A mixer that mixes raw material gases with different properties sent from a plurality of raw material gas lines, a flow rate measuring device and a flow rate control valve respectively attached to the plurality of raw material gas lines; a mixed gas line for sending out the mixed gas mixed in the mixer; a sampling device attached to the mixed gas line for detecting the calorific value and WI of the mixed gas; and supplying air for adjusting the calorific value to the mixed gas. an air line for mixing; an air flow meter and an air flow control valve attached to the air line; and an air flow leg for controlling the air flow control valve based on the flow rate signal from the air flow meter. a cylinder, a flow rate controller for controlling the flow rate of each raw material gas based on a flow rate signal from a flow rate measuring device attached to each of the raw material gas lines, and a WI of the sampling device.
In order to correct the flow rate of the raw material gas passing through other raw material gas lines in response to the WI value sent from the regulator and the flow rate signal from the flow rate measuring device of the fixed raw material gas line, the flow rate is adjusted. a flow rate ratio control device that sends a flow rate correction signal to a non-fixed flow rate controller; a correction device; a corrector that receives a signal from the correction device and a calorific value signal from a calorific value regulator of the sampling device and sends a flow rate correction signal to the air flow rate regulator; Heat control device.