JPS5929525A - Safety device for dangerous powdery granule transporter - Google Patents

Abstract

PURPOSE:To prevent the supply of high-temperature exhaust gas into a housing tank by controlling the opening and closing of a valve provided to an exhaust tube leading to a combustion chamber and an inlet tube. CONSTITUTION:When the pressure-sending and discharging time of powdery granules is elongated, the temperature of water in a water scrubber 10 is raised, and thereby the temperature of exhaust gas coming through the inlet tube 7 to an outlet 4 is raised. In this case, the temperature of the exhaust gas is detected by a detector 24, and when the temperature rises beyond a given one, it is sent out to a control circuit 21. By the control circuit 21, an alarm device 25 is operated or a signal is sent out to solenoids SOLA and SOLB to switch the valves 22 and 23. In short, the valve 22 is opened, the valve 23 is closed, the engine 5 is switched to no-load operation, and at the same time the inlet tube 7 is closed. Consequently, the supply of exhaust gas to the water scrubber 10 is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for a powder transport device that pumps dangerous powder such as pulverized coal using combustion exhaust gas.

In general, in a dust explosion, as the oxygen concentration decreases, the explosion pressure and pressure rise rate decrease, and eventually the substance loses its explosive properties. Also, limit acid to prevent floating MW dust from igniting due to electric sparks.

The elementary concentration is said to be less than 16%.

In this sense, it is effective to use exhaust gas from a combustion chamber of an axle-mounted engine to forcefully transport hazardous powder and granular materials. Powder transport vehicles that use engine exhaust gas to forcefully transport powder and granule materials are well known (for example,
-5846).

However, the temperature of the exhaust gas in such a transport vehicle is generally high (350° C.), and it is inappropriate to use the exhaust gas as it is directly as a pumping source because there is a risk of spontaneous combustion.

Therefore, the applicant first devised a powder transport vehicle that uses a water scrubber to remove dust from exhaust gas and cool it at the same time, but as the pumping time of the powder increases, the water temperature in the water scrubber increases. As a result of this increase, the temperature of the exhaust gas fed into the storage tank also increases. especially,
If the water scrubber is not refilled with water, high-temperature exhaust gas will be supplied directly into the storage tank.

The present invention has been made in view of the above points, and when the exhaust gas to the storage tank rises above a certain temperature, the on-off valves interposed in the exhaust pipe and inlet pipe from the combustion chamber are controlled to open and close, and the high temperature This prevents the exhaust gas from being supplied into the storage tank.

Embodiments in which the present invention is applied to an axle will be described below based on the drawings.

2 is a powder transport vehicle, in which a powder storage tank 2 is mounted on a vehicle body 1, and a dump cylinder 3 is interposed between the front part of the powder storage tank 2 and the vehicle body 1. Reference numeral 4 denotes a discharge section formed at the lower rear end of the powder storage tank 2, into which exhaust gas from the engine is introduced to fluidize the powder, as will be described later. Reference numeral 5 designates the engine of the powder transport vehicle V. One end of an inlet pipe 7 is connected to the middle of an exhaust pipe 6 of the engine 5, and the other end of the inlet pipe 7 is connected to a primary air supply pipe 8 and a secondary air supply pipe 8. It is connected to the discharge section 4 via a supply pipe 9.

By the way, a water scrubber 10 is installed in the introduction pipe 7 to collect dust contained in the engine exhaust gas.
．． Cooler 11. A cyclone 12 and a heater 13 are installed in this order. Further, a back pressure air supply pipe 14, which has one end connected to the introduction pipe 7 and the other end connected to the upper part of the powder storage tank 2, has an on-off valve 15 and a check valve 16 interposed therebetween. There is.

In addition, the above-mentioned primary air supply pipe 8 and secondary air supply pipe &6
't 9 includes on-off valves 17 and 18 and check valves 19.
．． 20 are arranged respectively.

Furthermore, cedar [on the downstream side of the connection between the trachea 6 and the introduction pipe 7,
Opening/closing valves 22 and 23 are arranged, which are controlled to open and close in response to signals from the control circuit 21, as will be described later. The control valves 22 and 23 may be directly controlled by solenoids 5QLA, SQL, and B that operate in response to signals from the control circuit 21, or may be controlled directly by solenoids 5QLA, SQL, and B, which operate in response to signals from the control circuit 21. The opening and closing may be controlled by outputting a signal to the control valve and expanding and contracting the air cylinder.

Reference numeral 24 denotes a detection device arranged on the downstream side of the introduction pipe 7 to detect the temperature of the exhaust gas, and when the exhaust gas temperature rises above a certain level, for example, 80°C or above, the signal is sent to the control circuit 2.
1. 25 is an alarm device.

Next, to explain the operation of the present invention, first, after putting pulverized coal into the granular material storage tank 2 through the manhole 26,
Transport to destination.

When discharging pulverized coal from the granular material storage tank 2, the dump cylinder 3 is extended and the granular material storage tank 2 is tilted, and when a start switch (not shown) is operated, a signal is output from the control circuit 21, At the same time as the on-off valve 23 is opened, the on-off valve 22 is closed. Next, when the on-off valve 17 is opened, the exhaust gas from the engine 5 is transferred to the exhaust pipe 6. Introductory tube7.
The pulverized coal flows into the discharge section 4 through the second air supply pipe 8, mixes the pulverized coal into the exhaust gas, and discharges it to the outside. At this time, a water scrubber 10, a cooler 11. Since the cyclone 12 and the heater 13 are installed in this order, the coarse dust contained in the engine exhaust gas is first removed by the water scrubber 10.

The temperature of the exhaust gas is lowered by the water scrubber 10 (from 350°C to 80°C), and then further cooled by the cooler 11 (from 80°C to 40°C), resulting in dew condensation with fine dust as the nucleus. Moisture and fine dust are removed. After that, the temperature A (4,0
℃→80℃), the moisture in the exhaust gas flowing out from the cooler 11 and becoming supersaturated due to natural air cooling is evaporated.

Therefore, there is no possibility that the inner wall of the discharge part 4 gets wet and the pulverized coal sticks and solidifies, thereby clogging the discharge part 4.

In addition, if the pressure inside the powder storage tank 2 decreases,
What is necessary is to supply the exhaust gas into the powder storage tank 2 by listening to the on-off valve 15 and increase the pressure inside the powder storage tank 2.

By the way, as the time for pumping and discharging the powder becomes longer, the temperature of the water in the water scrubber 10 rises, and as a result, the temperature of the exhaust gas flowing through the inlet pipe 7 to the discharge section 4 also rises. In this case, the exhaust gas temperature is detected by the detection device 24, and when the temperature exceeds a certain level, it is output to the control circuit 21. Therefore, the control circuit 21 activates the alarm device 25 or outputs a signal to the solenoids 5OLA and 5OLB for a certain period of time to switch the on-off valves 22 and 23.
That is, as a result of opening the on-off valve 22 and closing the on-off valve 23, the engine 5 enters a no-load operation, and at the same time, the introduction pipe 7 is closed, so the supply of exhaust gas to the water scrubber 10 is cut off. After this, the water in the water scrubber 10 may be replaced or cooled as appropriate.

As described above, in the present invention, when discharging powder and granules,
The rise in exhaust gas temperature in the inlet pipe is detected and the on-off valve interposed in the exhaust pipe is opened, and at the same time the on-off valve in the inlet pipe is closed. Therefore, the pumping and discharging work can be carried out safely.

[Brief explanation of the drawing]

The drawing is an overall configuration diagram showing an embodiment of the present invention2...◆
Powder storage tank, 4...discharge section. 500. Engine, 61--#JII% pipe, 7...Introduction pipe, 21φ...Control circuit, 22.23...Opening/closing valve,
24...Detection device applicant ShinMaywa Industries Co., Ltd.

Claims (2)

[Claims] (1) One end of the introduction pipe connected to the exhaust pipe from the combustion chamber is connected to the discharge part of the powder storage tank, and the other end of the introduction pipe is connected to the discharge part of the powder storage tank, so that the powder is pumped using combustion exhaust gas. In the body transport device, on-off valves are provided on the downstream side of the connection between the introduction pipe and the exhaust pipe, and a detection device is provided to detect the exhaust gas temperature of the introduction pipe, so that the temperature of the exhaust gas exceeds a certain temperature is provided. A safety device for a hazardous powder transport device, characterized in that when the material rises, it issues an alarm or controls the opening and closing of the on-off valves of the exhaust pipe and the inlet pipe. (2) The safety device for a dangerous powder and granular material transportation device according to claim 1, wherein the combustion chamber is an engine mounted on an axle.