JPS6039608B2 - Pulverized coal high pressure gas pipe transportation equipment - Google Patents

Description

Detailed Description of the Invention The present invention relates to a high-pressure gas pipe for pulverized coal, in which a pressurized tank supplied with pressurized gas is filled with pulverized coal, and the pulverized coal is transported through a transport pipe supplied with transport gas. Regarding road transportation equipment.

In the high-pressure gas pipe transportation system for fine coal, the material to be transported is flammable fine coal, which is fully stored in a pressurized tank, so as the fine coal oxidizes in the pressurized tank, it generates heat. Because of the risk of ignition and explosion, and because it is pressurized in a pressurized tank, the partial pressure of oxygen increases, which is dangerous. For these reasons, low-pressure, low-density gas transportation methods are exclusively used for transporting pulverized coal. is common.

However, in this low-pressure gas transportation method, the amount of gas to be transported to the amount of pulverized coal, that is, the mass ratio is low, and a large amount of gas to be transported is required for transportation, so it has the disadvantage that it cannot satisfy the demand for energy saving. The present invention detects dangerous conditions such as ignition and explosion that occur when pulverized coal is transported under high pressure, and when this condition is reached, inert gas and extinguishing agent are supplied into the pressurized tank and the supply of transport gas is stopped. The present invention aims to provide a novel high-pressure gas pipe transport device for pulverized coal that can ensure safety by suppressing dangerous conditions.
An embodiment of the present invention will be described below with reference to the drawings. 1 is a pressurized tank having a pulverized coal charging valve 2 at the top and a fluidized bed 3 at the bottom; 5 is an inert gas supply source; 6 is an inert gas regulating valve installed in the pressurizing line; this regulating valve 6 is located at the fluidized bed 3 position; The pressure is detected by the pressure gauge 7, the detected output is detected by the supplied pressure regulator 7, and the detected output is operated by the output of the supplied pressure regulator 8.

10' is a discharge nozzle which is extended to the pressure tank and whose pulverized coal inlet is closely opposed to the fluidized bed 3; 11 is a transport valve that is operated to be fully closed when not being transported and fully open during transport. This is a transport pipe connected via 12.

14 is a transport gas supply line connected to the secondary side position of the transport valve 12 of the transport pipe 11 and supplies air as transport gas;
5 is an air supply source; 16 is a flow control valve inserted into the supply line 14;
The detection output of the flow rate detector 17 interposed in the flow rate controller 18 is operated by the output of the supplied flow rate regulator 18.

20 is a thermometer insertion port formed in the lower outer wall of the pressurized tank 1, and 24 is an electric side thermometer inserted into the pressurized tank through the insertion port 20.

In an example of the side thermometer 24, as shown in FIG. 2, a side temperature resistor 26 is disposed within a protective tube 25, and a lead wire 27 of the leakage temperature resistor 26 is led out. In addition, a porous body 28 having air permeability made of a sintered body of ceramic or metal grains (for example, sintered metal) is disposed at the lower part of the protection tube 25 inserted into the tank to form a ventilation hole. The gas inside the tank is introduced into the protective tube 25 through this vent hole. Therefore, the lead wire 27 of the salt meter 24 is connected to the measurement circuit 3.
0, and a current value proportional to the temperature inside the tank is obtained from this circuit 30, which is supplied directly and via the differentiating circuit 30 to the control device 32, respectively.

On the other hand, the gas in the tank introduced into the protection tube 25, that is, the carrier gas, and the mixed gas such as carbon monoxide generated from the powdered coal accumulated in the tank are passed through the conduit 33 conveying to the protection tube 25, for example, by an infrared absorption method. The gas is supplied to carbon monoxide analyzers 34, from which electrical outputs corresponding to the monoxide concentration are obtained, and these are supplied to the control device 32. The control device 32 sets a set upper limit value, that is, a value selected based on known safety conditions, such as a temperature of 6000 or less, a temperature increase rate of LOOO/h, and a carbon monoxide concentration of 20% or less, and a predetermined safety factor; Temperature measurement circuit 30, differentiation circuit 31
, and the output of the carbon monoxide analyzer 34, and when each detected output exceeds the set value, an alarm circuit 36 such as a lamp or buzzer is activated.
The output to drive the extinguishing agent injection valve 37 is obtained.
Open the pressurized tank and fill it with fire extinguishing halogenated hydrocarbon (e.g. OF3Br, CBr2-CIF2, CBrF2).
An operating output (SO) for injecting a suppressor/coolant such as -CBrF2), CO2, N2, lime charcoal, carbon powder, etc. is obtained, and on the other hand, this operating output terminal is used to control the pressure regulator 8 of the pressurizing line 4 and the pressure regulating valve. An inert gas supply electromagnetic valve 38 interposed between the pressurized tank 1 and the pressurized tank 1 is operated, whereby the pressure regulating valve 6 is fully opened and inert gas is supplied into the pressurized tank 1. Further, the output (SI) obtained from the control device 32 at the same time as the output (SO) operates the air stop electromagnetic valve 40 interposed between the flow rate controller 18 and the flow rate control valve 16 of the transport gas supply line 14, thereby adjusting the flow rate. The control valve 16 is fully opened and the supply of transport gas to the transport pipe 11 is stopped. Next, to explain the operation of the present invention, first, the input valve 2 is placed in the pressurized tank 1.
After filling the pressurized coal with pulverized coal through the pressurizing tank and then opening the pressure regulating valve 6 and supplying inert gas into the pressurizing tank through the pressurizing line 4 to increase the pressure inside the pressurizing tank to the required value,
By opening the transport valve 12 and opening the flow control valve 16 to supply transport gas to the transport pipe 11 through the transport gas supply line 14, powdered coal is transported at a constant rate within the transport pipe 11 with an amount cut out according to the transport gas flow rate. be done.

In this case, the ratio of transport gas flow rate to pressurized gas flow rate is usually lo:
It is about 1. Therefore, the resistance value of the side salt resistor 26 of the thermometer 24 is proportional to the temperature inside the tank, and therefore the measurement circuit 3
An electrical output representing the temperature inside the tank is obtained from 0, an electrical output representing the rate of temperature rise is obtained from the differential circuit 31, and an electrical output representing the temperature increase rate is obtained from the carbon monoxide analyzer 34. Electrical outputs representing the carbon monoxide concentration are obtained and each of these is supplied to the control device 32, so in a normal state where each detection output is below the set upper limit, this control device 32 outputs an alarm drive output (SA) and Valve operation output (S
O), (SI) cannot be obtained, and if an abnormal state occurs in which the temperature inside the tank increases or the carbon monoxide concentration increases, the control device 3
An alarm drive output (SA) is obtained from the alarm circuit 36, and a visual and/or audible alarm is issued from the alarm circuit 36, and the valve operation output (SO) operates the valves 37 and 38 to suppress the pressure inside the pressurized tank. - When the coolant is introduced, the inert gas is filled, and the solenoid valve 40 is operated by the valve operation output (SI), and the transport gas flow rate control valve 16 is fully opened, and the transport pipe 11 is
The supply of air is stopped to prevent the spread of the abnormal condition.

As described above, according to the present invention, since the pressurized tank is pressurized by supplying inert gas, oxidation in the pulverized coal storage section can be suppressed, and moreover, pulverized coal does not accumulate and is removed. In the transport pipe, where oxidation is low, fine coal is transported mainly by air transport gas, which reduces the amount of inert gas used, and when the destination is a combustible device such as a blast furnace tuyere. It does not interfere with its combustion, and if an abnormal situation occurs due to oxidation progressing in the fine coal sump in the pressurized tank, this will be detected and extinguishing/suppressant will be added in the pressurized tank. This method has excellent features such as being able to suppress abnormal situations by supplying inert gas and stopping the supply of transport gas, and providing a safe and efficient pulverized coal transportation method.

In the above example, the case where the neck thermometer 24 is a field temperature resistance thermometer has been described, but the present invention is not limited to this, and any device that can provide an electrical output such as a thermocouple thermometer may be used.

Further, the extinguishing agent injection valve 37 is not limited to the position shown in the illustrated example, and may be provided on the pressurizing line 4.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an example of the present invention, and FIG. 2 is an enlarged sectional view showing an example of a thermometer. 1 is a pressurized tank, 4 is a pressurized line, 11 is a transport pipe, 14
is a transport gas supply line, 24 is an electric side thermometer, 34 is a carbon monoxide analyzer, 32 is a control device, 37 is a fire extinguishing agent, 38 is a solenoid valve for supplying inert gas, and 40 is a solenoid for stopping air. valve. Figure 1 Figure 2

Claims (1)

[Claims] 1. In a high-pressure gas pipe transportation device for pulverized coal, in which pulverized coal is filled in a pressurized tank to which pressurized gas is supplied, and the pulverized coal is transported through a transport trachea to which transport gas is supplied, the pressurized gas is The inert gas and the transport gas are air, and the temperature of the pulverized coal and the concentration of carbon monoxide gas in the pressurized tank are detected to detect a dangerous condition, and when the dangerous condition is reached, a A gas pipeline transportation device for pulverized coal, characterized in that it supplies an inert gas and a fire extinguisher and also stops the supply of the transportation gas.