JP2928819B2 - Automatic pumping control device for hydrochloric acid fume gas from hydrochloric acid tank truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for pumping hydrochloric acid from a transport tank lorry filled with hydrochloric acid (concentrated aqueous hydrochloric acid having a concentration of about 35%) to a storage tank installed in a factory or the like by an air pressurized pumping method. And a pressure control device for the fume gas of hydrochloric acid remaining in the tank.

[0002]

2. Description of the Related Art Conventionally, a tank lorry (L) as shown in FIG. 4 is provided as an air pressurized pressure feeding system for supplying hydrochloric acid in a tank (A) of a tank lorry (L) for transporting hydrochloric acid into a storage tank (B). High pressure air is injected into the tank (A) by the compressed air compressor (a) and the hydrochloric acid in the tank (A) is pumped into the storage tank (B) through the supply hose (b) by the high pressure air. Have been done. However, a large amount of pressurized gas remains in the tank (A) as the hydrochloric acid fume gas at the end of the hydrochloric acid pumping, and the hydrochloric acid fume gas once enters the storage tank (B) via the supply hose (b), It flows out of the storage tank (B) through (c). In order to safely treat this fume gas, the fume gas is sent to a scrubber (C) arranged outside the storage tank (B), where a water shower is applied to the fume gas to dissolve the hydrochloric acid in water. In this method, a low-concentration aqueous hydrochloric acid solution is discharged and air is released into the atmosphere.

However, in the above-mentioned conventional system, a large amount of high-pressure hydrochloric acid fume gas is rapidly blown out of the tank (A) and sent into the scrubber (C). A scrubber is needed,
If the processing capacity of the scrubber (C) is not enough,
Untreated hydrochloric acid fume gas is released into the atmosphere, which has a serious impact on the environment.

As a countermeasure, conventionally, an operator measures the supply valve (d) of the supply hose (b) just before the blowing of hydrochloric acid fume gas following the supply of hydrochloric acid from the tank (A). The flow of hydrochloric acid fume gas per unit time is limited by appropriately reducing the flow rate. However, the failure to release the fume gas of hydrochloric acid due to a slight delay in the timing of the start of the throttle operation of the supply valve (d). Often, the workers were strictly required with great care and skill.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the amount of hydrochloric acid fume gas blown out to the storage tank is automatically limited in response to the termination of the hydrochloric acid pumping from the tank of the tank lorry. It is an object of the present invention to maintain a small capacity, omit a supply valve operation requiring skill, and sufficiently prevent the discharge of hydrochloric acid fume gas into the atmosphere.

[0006]

As a means for solving the above problems, the present invention relates to an apparatus connected between a tank lorry to supply hydrochloric acid filled in a tank by a pressurized air supply method and a storage tank. An inlet connected to the tank of the tank lorry is provided on one side of the chamber, and an upper outlet and a lower outlet connected respectively to the storage tank are provided at upper and lower portions, respectively. When the float valve body for opening and closing the lower outlet is inserted so as to be able to ascend and descend in a state where the communication from the inlet to the upper outlet is always maintained, and when the float valve body is in a full liquid state in the chamber, A hydrochloric acid tank lorry, which is formed so as to ascend and open the lower outlet, and to lower and close when in a gas-liquid mixed state, and is provided with a means for restricting a gas flow rate in an outflow passage from the upper outlet. Suggest automatic pumping controller hydrochloric fume gases.

The "chamber" in the present invention may have a cylindrical shape, a rectangular tube shape, a box shape, or various other shapes.
The orifice, needle valve, and other various structures are used as the "means for restricting the gas flow rate". Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0008]

1, a flexible supply hose (4) is connected to a lower end of a tank (2) of a tank lorry (1) for transporting hydrochloric acid via a supply valve (3). Attach one male joint (5) constituting the pipe joint to the tip of
An air compressor (6) is mounted on the chassis as a means for pressurizing and pumping the hydrochloric acid inside, and an air supply pipe (7) connected to a discharge port of the compressor (6) is connected to the above-mentioned air supply valve (8) through an air supply valve (8). It is connected to the upper part of the tank (2).

On the other hand, an automatic pumping control device (10) is installed on one side outside a cylindrical storage tank (9) installed upright in a factory or the like, and an inflow valve is provided in an inflow pipe (11) of the device (10). (1
Attach the other female joint (13) to which the male joint (5) is to be detachably connected via 2), and place the outflow pipe (14) of the device (10) on the upper part of the storage tank (9). Connected. On the other side of the storage tank (9), a conventionally known ordinary scrubber (15) is arranged, and an inflow pipe (16) of the scrubber (15) is connected to an upper part of the storage tank (9). . (17) is a water shower pipe, (18) is a water discharge pipe, and (19) is an air discharge pipe.

The details of the automatic pumping control device (10) are as follows. 1, 2 and 3, a cylindrical chamber (20) with both ends closed is placed on a support (21) with its closed end facing up and down, and an inlet ( 22) is connected to the upper outlet (2
3) A lower outlet (24) is opened, and a rubber sheet is stretched on the opening surface of the lower outlet (24) to form a valve seat (28). An upper outflow pipe (26) having a needle valve (25) at the upper outflow port (23) is connected to the inflow pipe (11).
A lower outlet pipe (27) is connected to the lower outlet (24), respectively, and the upper and lower outlet pipes (26),
(27) is connected to the outflow pipe (14) as shown in FIG. 1, and a float valve body (29) is inserted into such a chamber (20) so as to be able to move up and down.

The float valve body (29) has a diameter appropriately smaller than the inner diameter of the chamber (20) and a lower surface of a hollow cylindrical float (30) having a length that is about half as long as the chamber (20). A support part (31) protrudes from the center,
A disc-shaped valve element (32) for opening and closing the outlet (24) is fixed to the lower end of the support portion.
A slider (33) extending in the generatrix direction on the outer peripheral surface of 0)
Are provided at equal intervals, and spacers (34) are provided on the upper surface, which are radially extended with a center portion, at equal angles, so that the float (30) can move the slider (33). ) Are held up and down in a state where a flow path (35) is formed between the inner surface of the chamber (20) and the chamber (20) by a spacer (34) when it is raised to the highest position. Are maintained between the inner surfaces of the upper ends of the flow paths (36), and these flow paths (35),
The inlet (22) and the upper outlet (23) are always in communication through the chamber (20) via (36).

In this case, the float valve body (29) is
When the inside of the chamber (20) is filled with hydrochloric acid, it floats, but when the gas-liquid mixture of fume gas and hydrochloric acid (mixing ratio is 6: 4 as an example), the specific gravity of the fluid in the chamber decreases. It is designed to descend to close the float valve.

The operation of the above example will now be described. The tank lorry (1) is moved near the storage tank (9), the male joint (5) of the supply hose (4) is connected to the female joint (13) of the inflow pipe (11), and the air compressor (6) is connected.
The high pressure air is supplied into the tank (2) by opening the air supply valve (8). When the required pressure is reached in the tank (2), the supply valve (3) and the inflow valve (12) are opened, respectively, and the hydrochloric acid in the tank (2) is supplied with the supply hose (4) and the inflow pipe (1).
It is pumped into the chamber (20) via 1). When the hydrochloric acid is almost full in the chamber (20), the float valve body (29) floats, separating the valve body (32) from the valve seat (28) and opening the lower outlet (24), thereby opening the chamber. Hydrochloric acid in (20) is pumped into the storage tank (9) from the lower outlet (24) via the lower outlet pipe (27) and the outlet pipe (14), and this pumping state is maintained thereafter. In this case, the upper outlet (23) is also in communication with the inlet (22), but the flow from the upper outlet (23) is controlled by the needle valve (25) attached to the upper outlet (23). Most of the hydrochloric acid that has flowed into the chamber (20) is pumped through the lower outlet (24) because the resistance is greater than that from the lower outlet (24).

When the hydrochloric acid in the tank (2) is completely pumped, a large amount of high-pressure hydrochloric acid fume gas containing a mixture of high-pressure air and hydrochloric acid fume remains in the tank (2), and this gas is supplied through the supply hose (4). It is pumped into the chamber (20) and blown into the hydrochloric acid in the chamber to create a gas-liquid mixed state, whereby the specific gravity of the fluid in the chamber (20) decreases and the float valve body (29) descends Then, the lower outlet (24) is closed by the valve body (32) and only the upper outlet (23) is opened. At this time, while hydrochloric acid remains in the supply hose (4), a state in which hydrochloric acid and high-pressure gas simultaneously flow into the chamber (20) continues, but the float valve body (29) rises. While flowing, the gas flowing into the chamber (20) is
0), without remaining in the channel (35), (36).
Through the upper outlet (23) and immediately out of the chamber (20), whereby the float valve (2)
9) does not repeatedly go up and down. The high pressure hydrochloric acid fume gas thus pumped into the chamber (20) passes through the upper outlet (23) and the needle valve (25).
The amount of outflow per unit time is restricted by the above and sent to the storage tank (9) through the upper outflow pipe (26) and the outflow pipe (14), and then from the storage tank (9) through the scrubber inflow pipe (16) to the scrubber (15). ) And processed.

The flow rate to be restricted by the needle valve (25) is desirably a flow rate corresponding to the maximum processing capacity of the scrubber (15).

When the discharge of the hydrochloric acid fume gas from the tank (2) is completed, the valves (3) and (12) are closed to separate the male and female joints (5) and (13).

[0017] The automatic control device for automatic transmission of fume gas of hydrochloric acid of the present invention may be mounted on a tank lorry.

[0018]

According to the present invention, the control apparatus for automatically feeding the hydrochloric acid fume gas from the hydrochloric acid tank lorry automatically fills the hydrochloric acid fume gas storage tank immediately upon completion of the hydrochloric acid pumping from the tank of the tank lorry. It is possible to limit the pumping flow rate per unit time, thereby making it possible to use a small-sized scrubber with sufficient capacity, reduce the cost of equipment and increase the supply valve operation that requires conventional skill. It sufficiently solves problems such as contamination and corrosion of the surroundings due to hydrogen chloride fume gas, and enables safe and reliable pumping of hydrochloric acid.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an entire system for pumping hydrochloric acid from a tank truck to a storage tank.

FIG. 2 is an enlarged vertical sectional front view of the automatic pumping control device.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a schematic diagram of the entire conventional hydrochloric acid pumping system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank lorry 2 Tank 9 Storage tank 10 Automatic control apparatus for pressure control of fume gas of hydrochloric acid 20 Chamber 22 Inlet 23 Upper outlet 24 Lower outlet 25 Needle valve 29 Float valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B67D 5/34 B67D 5/02 B67D 5/54

Claims (1)

(57) [Claims] 1. A device connected between a tank lorry to supply hydrochloric acid filled in a tank by an air pressurized pressure supply system and a storage tank, wherein the tank lorry tank is provided at one side of a chamber. An upper outlet and a lower outlet respectively connected to the storage tank are provided at the upper and lower portions, respectively, and a float valve body for opening and closing the lower outlet is provided in the chamber. In a state where the communication from the upper outlet to the upper outlet is always maintained, the lower valve is inserted so as to be able to move up and down, and when the chamber is full, the lower outlet is opened to open the lower outlet, and the gas-liquid mixed state is established. An automatic pumping control device for hydrochloric acid fume gas from a hydrochloric acid tank lorry, which is formed so as to be lowered and closed at a time, and provided with means for restricting a gas flow rate in an outflow path from the upper outlet.