JPH0776400A - Automatic pressure-feed controller for hydrochloric acid fumes from tank truck - Google Patents

Abstract

PURPOSE:To automatically control, at the end of the transfer of hydrochloric acid from a tank truck under pressure, the amount of fumes of hydrochloric acid effusing into a storage tank so as to ensure safe disposal of the hydrochloric acid fumes. CONSTITUTION:In a chamber 20 an inflow port 22 to be connected with the tank of a tank car is formed at one side an upper outflow port 23 and a lower outflow port 24 each to be connected with the storage tank are formed at the upper side and and lower side respectively. Inside the chamber 20 a float valve 29 for opening and closing the lower outflow port 24 is inserted in a manner of being freely movable up and down and at all times keeping a passageway open from the inflow port 22 to the upper outflow port 23. The float valve 29 is designed to rise, when the chamber 20 is filled entirely with liquid, and open the lower outflow port 24 and descend and close it when the liquid and gas are in a mixed state. This automatic pressure-feed controller 10 is equipped with a means of restricting the flow rate of gas in the outflow passageway from the upper outflow port 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a case where hydrochloric acid (concentrated hydrochloric acid aqueous solution having a concentration of about 35%) is pumped into a storage tank installed in a factory or the like from a transport tank truck filled with hydrochloric acid by a pneumatic pressurization method. The present invention relates to a pressure feeding control device for fume gas of hydrochloric acid remaining in a tank.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a tank lorry (L) is equipped with an air pressure and pressure feeding system for supplying hydrochloric acid in a tank (A) of a hydrochloric acid transport tank lorry (L) into a storage tank (B). A high pressure air is forced into the tank (A) by the compressed air compressor (a), and the hydrochloric acid in the tank (A) is pressure-fed into the storage tank (B) through the supply hose (b) by the high pressure air. It is being appreciated. However, a large amount of pressurized gas remains in the tank (A) as hydrochloric acid fume gas at the end of the above-described hydrochloric acid pressure feeding, and the hydrochloric acid fume gas once enters the storage tank (B) via the supply hose (b), and then the pipe. It flows out of the storage tank (B) through (c). In order to safely treat the fume gas of hydrochloric acid, the fume gas is sent to a scrubber (C) arranged outside the storage tank (B), and the fume gas of hydrochloric acid is subjected to a water shower to dissolve the hydrochloric acid content in water. Is discharged as a low-concentration aqueous solution of hydrochloric acid and air is released into the atmosphere.

However, in the above-mentioned conventional method, a large amount of high-pressure fume gas of hydrochloric acid is rapidly blown out of the tank (A) and sent into the scrubber (C). You need a scrubber,
If the processing capacity of the scrubber (C) is not sufficient,
Fume gas that cannot be processed is released into the atmosphere and has a serious impact on the environment.

As a countermeasure against this, conventionally, an operator sees the supply valve (d) of the supply hose (b) just before the blowing of the hydrochloric acid fume gas following the hydrochloric acid pressure feeding from the tank (A). Although the method of limiting the flow rate of the fume gas of hydrochloric acid per unit time is performed by appropriately squeezing, the failure to release the fume gas of hydrochloric acid due to a slight delay in the start timing of the throttle operation of the supply valve (d). Often, the workers were required to be extremely careful and skilled.

[0005]

DISCLOSURE OF THE INVENTION The present invention automatically limits the blowing amount of hydrochloric acid fume gas into a storage tank in response to the completion of the supply of hydrochloric acid from the tank of the tank lorry, whereby the scrubber's An object of the present invention is to maintain a small capacity, omit a supply valve operation that requires skill, and sufficiently prevent release of fume gas of hydrochloric acid to the atmosphere.

[0006]

As a means for solving the above problems, the present invention is an apparatus connected between a tank lorry and a storage tank to which hydrochloric acid filled in a tank is to be pressure-fed and supplied by an air pressure-pressure feeding method. Where 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 to the storage tank are provided on the upper and lower portions, respectively, and in the chamber, The float valve element for opening and closing the lower outlet is vertically inserted while maintaining the communication from the inlet to the upper outlet, and the float valve element is inserted when the chamber is full of liquid. A hydrochloric acid tank truck provided with means for ascending to open the lower outlet and to lower and close when in a gas-liquid mixed state, and means for limiting the gas flow rate in the 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 other various shapes.
Further, as the "means for limiting the gas flow rate", an orifice, a needle valve, and various other structures are used. Embodiments of the present invention will be described below with reference to the drawings.

[0008]

EXAMPLE In FIG. 1, a flexible supply hose (4) is connected to the lower end of the rear part of a tank (2) of a tank truck (1) for transporting hydrochloric acid via a supply valve (3), and the supply hose (4) is also connected. Attach one male joint (5) that forms a pipe joint to the tip of the
An air compressor (6) is installed in the chassis as a means for air pressure pressurization of hydrochloric acid in the chassis, and an air supply pipe (7) connected to a discharge port of the compressor (6) is connected to the above through an air supply valve (8). It is connected to the top of the tank (2).

On the other hand, an automatic pressure-feeding control device (10) is installed on one outside of a cylindrical storage tank (9) installed upright in a factory or the like, and an inflow valve is installed in an inflow pipe (11) of the device (10). (1
The other female joint (13) to be detachably connected to the male joint (5) via 2) is attached, and the outflow pipe (14) of the device (10) is attached to the upper part of the storage tank (9). It is connected. A conventionally known ordinary scrubber (15) is arranged on the other side of the storage tank (9), and an inflow pipe (16) of the scrubber (15) is connected to the upper portion 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 pressure feeding control device (10) are as follows. 1, 2 and 3, a cylindrical chamber (20) with both ends closed is installed on a support (21) with its closed ends facing up and down, and an inlet ( 22), and the upper outlet (2
3), the 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), and the inlet (22) is formed. An upper outlet pipe (26) having the needle valve (25) connected to the inflow pipe (11) and having an upper outlet (23) is provided.
Lower outlet pipes (27) are respectively connected to the lower outlets (24), and the upper and lower outlet pipes (26),
(27) is connected to the outflow pipe (14) as shown in FIG. 1, and the float valve body (29) is vertically movable in such a chamber (20).

The float valve body (29) has a diameter which is appropriately smaller than the inner diameter of the chamber (20) and has a vertical length which is about one half of the length of the chamber (20). A support part (31) is provided at the center,
A disc-shaped valve body (32) for opening and closing the outlet (24) is fixed to the lower end of the support portion, and the float (3
Slider (33) extending in the direction of the generatrix on the outer peripheral surface of (0)
... are projected at equal intervals, and spacers (34) extending in the radial direction at the center are projected on the upper surface at equal angles, so that the float (30) causes the slider (33) to move. ) ... Is held so as to be able to move up and down in a state where the flow path (35) is formed between the chamber (20) and the inner peripheral surface of the chamber (20), and when the chamber is raised to the uppermost position, it is held by the spacer (34). Maintain the flow paths (36) between the upper end inner surface of the
The inflow port (22) and the upper outflow port (23) are in continuous communication with each other in the chamber (20) via (36).

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

The operation of the above example will be described below. The tank truck (1) is moved to the vicinity of 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 air supply valve (8) is opened to supply high-pressure air into the tank (2). When the pressure in the tank (2) reaches the required pressure, the supply valve (3) and the inflow valve (12) are opened to supply the hydrochloric acid in the tank (2) with the supply hose (4) and the inflow pipe (1).
It is pumped into the chamber (20) via 1). When the hydrochloric acid approaches full in the chamber (20), the float valve body (29) floats to separate the valve body (32) from the valve seat (28) and open the lower outlet (24), whereby the chamber Hydrochloric acid in (20) is pressure-fed from the lower outlet (24) into the storage tank (9) through the lower outflow pipe (27) and the outflow pipe (14), and this pressure feeding state is continued thereafter. In this case, although the upper outlet (23) is also in communication with the inlet (22), the flow from the upper outlet (23) is changed by the needle valve (25) attached to the upper outlet (23). Since the resistance is greater than that from the lower outlet (24), most of the hydrochloric acid that has flowed into the chamber (20) is pumped through the lower outlet (24).

When all of the hydrochloric acid in the tank (2) is pumped, a large amount of high-pressure hydrochloric acid fume gas, which is a mixture of high-pressure air and fumes of hydrochloric acid, remains in the tank (2) and passes 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 valve body (32) closes the lower outlet port (24) and opens only the upper outlet port (23). At this time, while hydrochloric acid remains in the supply hose (4), hydrochloric acid and high-pressure gas continue to flow into the chamber (20) at the same time, but the float valve body (29) floats. The gas flowing into the chamber (20) during the operation is
0), the flow paths (35) ..., (36) ...
Through the upper outlet port (23) to the outside of the chamber (20) promptly, whereby the float valve body (2
9) does not repeatedly move up and down. Thus, the high-pressure fume gas of hydrochloric acid fed under pressure into the chamber (20) passes through the upper outlet (23) and the needle valve (25).
The amount of outflow per unit time is limited by the upper stream pipe (26) and the outflow pipe (14) to be sent into the storage tank (9), and then from the storage tank (9) through the scrubber inflow pipe (16) to the scrubber (15). ) And is processed.

The flow rate to be limited by the needle valve (25) is preferably a flow rate commensurate with the maximum processing capacity of the scrubber (15).

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

The automatic fume gas pressure control device of the present invention may be mounted on a tank truck.

[0018]

EFFECTS OF THE INVENTION According to the automatic feeding control device for hydrochloric acid fume gas from the hydrochloric acid tank lorry of the present invention, the fume gas storage tank for the hydrochloric acid fume gas is automatically fed to the tank immediately upon completion of the feeding of hydrochloric acid from the tank of the tank lorry. It becomes possible to limit the flow rate of pumping per unit time, so that the scrubber can be used with a small capacity enough, the rise of equipment cost can be suppressed, and the operation of the supply valve which requires skill like conventional one is required. It is possible to solve problems such as contamination and corrosion by the fumes of hydrochloric acid and fume gas, and to enable safe and reliable pressure feeding of hydrochloric acid.

[Brief description of drawings]

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

FIG. 2 is an enlarged vertical front view of the automatic pressure feeding control device.

FIG. 3 is a sectional view taken along line III-III in FIG.

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

[Explanation of symbols]

 1 Tank Roller 2 Tank 9 Storage Tank 10 Automatic Fume Gas Hydrochloric Acid Pressure Control Device 20 Chamber 22 Inlet 23 Upper Upper Outlet 24 Lower Outlet 25 Needle Valve 29 Float Valve Body

Claims (1)

[Claims] 1. A device connected between a tank lorry for supplying hydrochloric acid filled in a tank by an air pressure and pressure feeding method and a storage tank, wherein the tank lorry tank is provided on one side of the chamber. The upper and lower outlets connected to the storage tank are respectively provided on the upper and lower sides of the connected inlet, and the float valve body for opening and closing the lower outlet is provided in the chamber. From the upper part to the upper outlet, the float valve body is lifted when the chamber is full and the lower outlet is opened to keep the gas-liquid mixed state. An automatic pressure feeding control device for hydrochloric acid fume gas from a hydrochloric acid tank lorry, which is formed so as to be lowered and closed when a means for limiting a gas flow rate is provided in an outflow passage from the upper outlet.