JPS59219392A - Odorization of gas and device for it - Google Patents

Abstract

PURPOSE:To insure odorization of gas to a consistent concn., by attaching a bypass pipe provided with a odorant tank to a gas conduit pipe and controlling flow of gas passing through the bypass pipe in keeping with changes in pressure and temp. of the gas. CONSTITUTION:A bypass pipe 2 provided with an odorant tank 6 is attached to a gas conduit pipe 1. An odorant is vaporized into gas passing through the bypass pipe 2 to saturation in order to effect odorization of the gas. Pressure 7 in the odorant tank 6 and temp. 8 near the outlet of the tank 6 are sensored and these two variables are put in a computer 4 for calculation of a correction value and control of gas flow in the bypass pipe 2 through adjustment of a control valve 3. Thus, the gas flow is automatically controlled and the concn. of the odorant is maintained at a constant level even when the amt. of evaporated odorant is varied by change of temp. and pressure of gas passing through the bypass pipe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION 1 [Technical field to which the present invention pertains] The present invention (a method for adding odor to dregs, and an apparatus for the same)
For details, see ``Safety measures for detecting and disposing of leaks of raw gas at an early stage in urban wastes, etc.''
This article relates to a method and device for stabilizing the needle.
Ill.

Cage [Conventional technology] Figure 1 shows the conventional technology based on the /\Ipass method.
The odor device is shown, and eight throttle mechanisms 02 are installed in the gas conduit 01.
At the same time as installing the bypass pipe 03
Take the odorant tank 04 into the bypass tank 03 of 1.
The odorizing agent is evaporated and saturated in the gas passing through the bypass pipe 03.

[Problems with conventional technology]

Since the conventional bypass type odorization method (device) has the above-described configuration, it has a drawback that the odor concentration changes when there are fluctuations in the temperature and pressure of the gas passing through the bypass pipe. Therefore, in the past, a manual valve 05 was installed in the bypass pipe 03, and the concentration was kept within a specified range by operating the manual valve 05 relying on experience and intuition to change the amount of gas passing through the bypass pipe 03. It has been adjusted to fit.

However, with the above method, only an experienced person can make adjustments, and in equipment where temperature and pressure changes are large, the valves must be operated frequently, making it impossible to handle them realistically. Therefore, although the conventional method has many advantages over other odorizers, its adoption has been postponed.

[Object of the present invention] Based on the above points, the present invention proposes an odor adding method in which the odor concentration does not change even if there are changes in pressure and temperature passing through the bypass pipe, and an odor adding device used in this method. The purpose is to.

[Configuration of the present invention]

In order to achieve the above object, the present invention detects the pressure and temperature of the gas passing through the bypass pipe (line), calculates the correction value using the following formula based on the detected value, and calculates the correction value. Based on this correction value, the flow rate control valve installed in the bypass pipe is automatically controlled to maintain a constant odor concentration while controlling the flow rate.

First, in FIG. 2, when the flow rate of gas passing through the gas conduit 1 is V+ (N%) and the flow rate of gas passing through the bypass pipe 2 is V2 (%), the bypass flow path Assuming that the fluid resistance other than the flow rate control valve can be almost ignored, ・Division ratio CV+...Capacity coefficient of the main gas conduit nozzle CV2...Capacity coefficient of the flow rate control valve of the bypass pipe・Odorant balance evaporation amount F (g/h), dropping rate α (g Am'), A
Volatilization amount at point γ (g Am”) FT=α・(■+v2)=′v2φγ ・Relationship between gas pressure and volatilization amount at point A Gas pressure PI (kg/crn'abs), Odorant saturated vapor pressure Po (mmHz), constant KP'n determined by the type of odorant (°, "P,) > PD) - Saturated vapor pressure characteristics of the odorant gas temperature t ('CriP, = も(1+) -- −−−−−−−■■～■Formula 2 is better than formula ■.

From the above calculations, if we characterize the control value (CV) of the control valve 3 that is attached to the bypass pipe 2 or has a linear characteristic as a function of pressure and temperature as in the above equation, we can obtain a highly quantitative
It is possible to add odor.

In addition, in FIG. 2, 4 is an arithmetic unit, and 5 is this arithmetic unit 4.
6 is an odorizer, 7 is a pressure detection point, 8 is a temperature detector, 9.10 is a signal line, and 11 is a temperature converter.

FIG. 3 shows the odorizing device indicated by the reference numeral 6, in which a pipe 12 is inserted vertically into the odorant tank 6, and a gas 13 is introduced into a part of the pipe 12 from the gas conduit l. The odorant is introduced into the pipe 12, and the odorant in the odorant tank 6 is guided to the upper part of the tank using a bubble pump method, and is evaporated into gas entering the tank from the bypass pipe 2 to be saturated.

4th. A shows another embodiment of the odorizer, in which a meandering flow path 15 is formed by shifting the partition plate 14 in the vertical direction into the odorant tank 6, and in this meandering flow path L5. The structure is such that the odorant is evaporated and saturated in the gas that enters the tank from the bypass pipe 2. In addition, if porous materials such as fibers that have a high affinity with the odorizing liquid are placed on both sides of the partition plate 14, the contact area between the gas and the odorizing liquid will be expanded, and the saturated state will be maintained up to a high flow rate range. It is possible to expand the scope of application of this device.

FIG. 5 shows another embodiment of the odorizer, in which a gas feed pipe 16 is inserted from above into the center of the canopy of the odorizer tank 6,
The waste mass 19 of the umbrella-shaped ejection body 18 floated to a position slightly apart from the liquid level by the float 17 in the tank is inserted into the waste feed pipe 16 so as to be able to move up and down, and is made to constantly follow fluctuations in the liquid level. It is designed to achieve stable evaporation and saturation of the pricking agent. Numeral 20 is a multi-legged skirt formed around the umbrella-shaped ejector 18 to promote contact between the gas and the odorized liquid.

[Effects of the present invention]

As described in 1- below, the present invention detects when there is a change in gas pressure, or when a temperature change occurs in the gas, resulting in a change in saturated vapor pressure, and uses this detected value to create a correction value. By calculating , the amount of gas passing through the bypass pipe 2 is controlled and the odor concentration is stabilized, so troubles due to changes in the odor concentration can be prevented from occurring.

Next, as an I + J odor device, /''- as shown in Figure 3.
Pull pump method Meandering flow path method as shown in Fig. 5
By adopting the flow i method as shown in the figure,
The saturated state of the odorized liquid is guaranteed up to the high flow rate range.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional bypass type odorization device, and FIG. 2 is an embodiment diagram showing the odorization method and device according to the present invention.
Figures 3 (a) and (b) are cross-sectional views of an odorizer that uses a bubble pump system, and Figures 4 (a) and (b) are cross-sectional views of an odorizer that uses a meandering channel system. Figure 5 (a), (b),
(C) is a cross-sectional view of an odorization device employing a float method. 1...Gas conduit, 2...Bypass pipe,
3. Old...Flow rate control valve, 4... Arithmetic unit, 6...
・Stab device.

Claims (4)

[Claims] (1) When a bypass pipe is attached to the waste conduit, a stinging agent tank is attached to a part of the bypass pipe, and the waste passing through the bypass pipe is evaporated with an odorant to saturate the gas. 1) Detect the pressure inside the odor agent tank and the temperature on the inside of the tank or near the outlet, calculate a correction value from these two fluctuation values, and adjust the amount of waste passing through the bypass chamber. A method of adding odor to the residue. (2) Insert one pipe vertically into the detergent tank, and
This prick device is designed to feed part of the waste in the waste conduit into the tank, and introduce the odorized t to the upper part of the tank, where it is diffused and evaporated. (3) A serpentine flow path is formed by shifting the partition plate in the vertical direction of the 4-l odorant tank and passing the C dregs in the bypass pipe through this serpentine flow path. An odor device configured to evaporate a stinging agent. (4) 4=J Remove the gas inlet pipe from above against the center of the canopy of the odorant tank, and insert the waste inlet of the umbrella-shaped ejector, which has reached the float below, into the gas inlet pipe. A prick device inserted into the second lower movement point and configured to bring the gas outlet close to the liquid surface to evaporate the odor agent.