SU919681A1 - Method of explosion protection of closed production apparatus - Google Patents

Description

(3) METHOD FOR EXPLOSION PROTECTION OF CLOSED TECHNOLOGICAL APPARATUS

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The invention relates to automatic anti-explosion systems and can be used to prevent explosions in closed containers and process apparatuses in which gas, vapor, and dust-air mixtures are formed.

There is a method of explosion protection of closed technological devices by dumping the medium through a gas and gas pipeline to the buffer tank tl.

The disadvantages of the method are low reliability of protection caused by the fact that when a safety valve is triggered, the mass pipeline starts flowing into the buffer tank of fresh hot medium and high-temperature combustion products. Due to turbulence, a more intense burnout of the combustible medium inside the gas-mass pipeline takes place, and the pressure in the pipeline increases sharply, exceeding the pressure in the working apparatus. Zs-h occurs

stopping the gas and gas line, and gas flows from the mass line to the working unit. This contributes to an even greater intensification of combustion in the working apparatus and results in a spike of pressure surpassing the permissible level.

The aim of the invention is to improve the reliability of explosion protection.

10 closed technological devices.

. This goal is achieved by the fact that, according to the method of explosion protection of closed technological devices, by dumping the medium through the gas-mass water into the buffer tank, simultaneously with the beginning of the discharge of the medium into the gas-mass pipeline, a cooling agent is supplied with a flow rate of 1-10 B-YuM,

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and the discharge of the medium is carried out

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Claims (1)

The initial pressure in the buffer tank is Pg O, RRB relative to the pressure of the process apparatus. 3 Figs 1 and 2 are diagrams illustrating the method of explosion protection of closed technological devices. The closed technological device 1 is supplied with a buffer tank 2, in which the initial supercritical pressure differential is maintained with respect to the minimum value of the technological pressure in the working device 1, gas-gas line 3, valve A depressurizer A with a reservoir 5 with a coolant embedded in it or separately installed on the gas and gas duct 3. With the active method of explosion protection, the system also includes sensors (or a group of sensors) of the recording of fire 6 and a secondary signal of a starting device 7. One buffer tank can be used for the explosion protection of several working devices. In the event of an explosion in the working device with the active method of explosion protection, sensor 6 registers the fire at the very initial period, when the explosion pressure has not reached significant values, and transmits a control pulse through the secondary device 7 to the valve-depressurizer and p reservoir 5 with cooling agent. When the valve depressurizer k is activated, under the action of a supercritical pressure differential, determined mainly by the initial pressure in the buffer tank, the flow of the combustible mixture and / or high-temperature combustion products begins to flow into the buffer tank 2. At the same time, a cooling substance disperses into the gas tank 5 firstly, it prevents the burning of the combustible mixture inside the gas-mass pipeline, do not allow it to clog, and secondly, by reducing the temperature of the combustion products, it provides supercrit cal pressure drop over a long time and reduces the final pressure of the explosion. The flow rate of the coolant is essential. With a low flow rate, the temperature of the combustion products is not effectively reduced, and at 1 high flow rate, the gas and gas lines are blocked by the coolant, and the mass flow rate of the gas, steam, dust, and combustion products from the working apparatus is reduced. For example, optimal water flow rate depending on the method of dispersion-c-. In the passive method of explosion protection, the actuation of the valve-depressurizer and the opening of the reservoir 5 for dispersing the coolant is carried out directly under the action of the pressure of the explosion; The maximum value of pressure in the working apparatus with this method of explosion protection depends on the physicochemical properties of the combustible mixture, the design of the buffer tank and the gas-mass pipeline, the speed of the Kapan-depressurizer and the type of coolant. With an appropriate volume of the buffer tank and the diameter of the connecting gas and gas line, the pressure in the working apparatus does not exceed the limit value. This method makes it possible to increase the reliability of the protection of technological equipment from damage caused by explosions of gas, steam, dust and air, and ensures the safety of material resources and equipment. Claims of the method of explosion protection of closed technological devices by dumping the medium through the gas and gas line to the buffer tank, which is also distinguished by the fact that, in order to increase the reliability of protection, simultaneously with the start of the discharge of the medium inside the gas line, the pipeline is fed from the supply agent with a flow of NO5-1СГ М and the medium is discharged at an initial pressure P, in the buffer tank, which is., Pp.,. in relation to pressure P 8 technological apparatus, Sources of information taken into account during the examination 1. US patent W C 8b5b2, cl. 1b9-11, 1968. /.