RU2089750C1 - Device for preparation and delivery of gas and gas-and-liquid explosion-proof and fire-proof nitrogen-based mixtures - Google Patents

Abstract

FIELD: prevention of explosions and fires in hydrocarbon gaseous and gas-and-liquid mixtures; preparation and delivery of gas-and-liquid mixtures at high pressure. SUBSTANCE: device includes low-pressure air compressor, diaphragm apparatus, final- compression apparatus, separator, liquid reservoir and liquid delivery pump on transport facility. Compressor outlet is connected with diaphragm apparatus inlet; outlet of diaphragm apparatus is connected with gas inlet of final compression apparatus whose outlet is connected with separator inlet; outlet of separator is outlet of device. Separator liquid outlet is connected with liquid reservoir whose interior is connected with liquid inlet of final-compression apparatus through liquid delivery pump. Final-compression apparatus is made in form of piston or plunger pump. EFFECT: enhanced reliability. 2 cl, 2 dwg

Description

 The invention relates to the field of preparation and injection under high pressure of gas-liquid mixtures and can be used in various fields of technology to create an inert gas medium in closed volumes, for example, to prevent explosions and fires in hydrocarbon gas and gas-liquid mixtures.

 A technical solution [1] is known from the prior art according to which the production of nitrogen gas is carried out using a membrane apparatus in which the membranes are made of an organosilicon polymer, for example polyvinyltrimethylsilane.

 A disadvantage of the known technical solution is that it has a limited area of use due to the inability to obtain gaseous nitrogen under high pressure and the stationary membrane apparatus.

 Closest to the claimed device in technical essence is a device for the preparation and injection of gas and gas-liquid explosive and fireproof mixtures based on nitrogen [2] comprising a low-pressure air compressor, a membrane apparatus and a high-pressure compressor (booster) located on the vehicle low pressure compressor is connected to the input of the membrane apparatus, the output of which is connected to the input of the high pressure compressor, the output of which is the output of the device wa.

 The disadvantages of this device are significant energy costs and dimensions due to the polytropic process of gas compression in the booster compressor.

 The objective of the invention is to reduce energy consumption during the injection of gaseous nitrogen into a closed volume while reducing weight and size parameters of the device.

 The problem is solved in that the device for the preparation and injection of gas and gas-liquid explosive and fireproof mixtures based on nitrogen, containing a low-pressure air compressor located on the vehicle, connected to its outlet with the inlet of the membrane apparatus, and a booster apparatus according to the invention further comprises a separator with gas and liquid outlets and a fluid reservoir connected to a pump for supplying fluid from the reservoir, the booster apparatus is made in the form of a piston or plunger about a pump with gas and liquid inlets, the gas inlet of the piston pump connected to the outlet of the membrane apparatus, the liquid inlet to the pump for supplying liquid from the tank, and the outlet to the inlet of the separator, the gas outlet of which is the outlet of the device for producing gaseous nitrogen, and the liquid outlet of the separator connected to a fluid container.

 In a preferred embodiment, the piston pump comprises a working cylinder with a piston disposed therein, at least one pair of suction valves and one discharge valve mounted respectively on the gas and liquid inlets and outlets of the pump, the suction valve of the gas inlet of the pump being located between the working cylinder and the discharge valve .

 This embodiment of the device for producing gaseous nitrogen provides a reduction in energy consumption when injecting gaseous nitrogen into a closed volume due to the fact that a gas-liquid mixture is formed in the booster unit during the suction stroke, which completely enters the separator during the suction stroke, which leads to the fact that after pumping stroke in the "dead" volume of the working chamber of the pump is almost only liquid, which ensures the value of the filling factor of the working chamber during the suction stroke Bani close to unity. In the separator, a liquid is separated from the gas-liquid mixture, which then enters the appropriate container, and nitrogen under pressure enters the consumer.

 In addition, the placement of the suction valve of the gas inlet of the pump between the working cylinder and the discharge valve eliminates the possibility of nitrogen flows from the working chamber to the working cylinder.

 In FIG. 1 shows a block diagram of the proposed device for producing gaseous nitrogen; figure 2 an embodiment of a booster apparatus with a double-acting piston pump.

 The device for the preparation and injection of gas and gas-liquid explosive and fireproof mixtures based on nitrogen contains a low pressure compressor 1, a membrane unit 2, a booster unit 3, a separator 4 located on a vehicle (which can be used as a base machine, one or two trailers) , a fluid container 5 and a pump 6 for supplying liquid. The output of the low-pressure compressor 1 is connected to the inlet of the membrane apparatus 2, the output of which is connected to the gas inlet 7 of the booster apparatus 3. The liquid inlet 8 of the booster apparatus 3 is connected through a pump 6 to a liquid tank 5, and the output 9 of the booster apparatus 3 is connected to the separator 4 input the gas outlet 10 of which is the output of the device, and the liquid outlet 11 is connected via a pipe 12 to the liquid tank 5.

 The booster device 5 is made in the form of a piston or plunger pump (for example, a double action of FIG. 2) and includes a working cylinder 13 with a piston 14 located therein, suction valves 15 and 16 mounted on the liquid inlet 8, suction valves 17 and 18 installed at the gas inlet 7, discharge valves 19 and 20 installed at the outlet 9, while the suction valves 17 and 18 are placed between the working cylinder 13 and the discharge valves 19 and 20.

 The device can be used with standard equipment: a low-pressure compressor of type 2VM-15 / 25e, a diaphragm apparatus of type MVa-054, a piston pump of type 9TM, and a pump for supplying a liquid of type NB 4-160 / 63. In addition, centrifugal (hydrocyclone) and gravity separators of various types can be used in the device. When placing the device blocks on two car frames, it is preferable to place the low-pressure compressor and the membrane apparatus on a common frame. For clarity, in FIG. 2 directions of gas, liquid and gas-liquid mixture are shown by arrows.

 A device for the preparation and injection of gas and gas-liquid explosive and fireproof mixtures based on nitrogen works as follows. Using a compressor 1 low pressure (0.8 to 2.0 nPa), air from the atmosphere is supplied to the membrane apparatus 2, in which it is divided into main components. Oxygen is vented to the atmosphere, and a mixture containing 85-95% nitrogen is supplied to the gas inlet 7 of the booster apparatus 3. At the same time, a metered amount of the process fluid can be supplied from the tank 5 to the liquid inlet 8 of the booster apparatus 3, which can be used as process water.

 When the piston pump performs the suction stroke (the left part of the circuit in Fig. 2), nitrogen with a predetermined overpressure through the suction valve 17 is introduced into the working chamber of the pump. At the same time, liquid is introduced through the suction valve 15 into the working chamber (for clarity, the direction of movement of the liquid and gas in Fig. 2 are shown by arrows). At the end of the suction stroke, nitrogen, drawn from below by the liquid, occupies the volume of the working chamber of the pump adjacent to the discharge valve 19.

 When the piston pump performs the discharge stroke (the right part of the circuit in Fig. 2), the liquid from the working cylinder 13 is displaced by the piston 14, while the nitrogen is compressed to the discharge pressure, after which the discharge valve 20 is opened and the gas-liquid mixture is displaced through the outlet 9 of the booster apparatus 3 into the separator 4. Thus, by the end of the discharge stroke, only liquid will be in the “dead” volume of the pump chamber. The process is then repeated.

 In the separator 4, a liquid is separated from the gas-liquid mixture, which is removed from it through a pipe 12 into a liquid container 5. From the separator 4, compressed nitrogen from the outlet 10 is supplied to the consumer.

 Using the proposed device provides an isothermal process of gas compression with a high degree of compression without intermediate heat removal, therefore, special equipment for heat extraction is not required, which allows to reduce the energy consumption and dimensions of the device when producing nitrogen under high pressure.

Claims (2)

 1. A device for the preparation and injection of gas and gas-liquid explosive and flameproof mixtures based on nitrogen, containing a low-pressure air compressor located on the vehicle, connected to the inlet of the membrane apparatus by its outlet, and a booster apparatus, characterized in that it further comprises a gas and liquid separator outlets and a fluid reservoir connected to a pump for supplying fluid from the reservoir, the booster apparatus is made in the form of a piston or plunger pump with gas and liquid inputs, the gas inlet of the piston pump connected to the outlet of the membrane apparatus, the liquid inlet to the pump for supplying liquid from the tank, and the outlet to the inlet of the separator, the gas outlet of which is the output of the device for producing gaseous nitrogen, and the liquid outlet of the separator is connected to the liquid tank.  2. The device according to claim 1, characterized in that the piston or plunger pump comprises a working cylinder with a piston or plunger placed on it, at least one pair of suction valves and one discharge valve, respectively installed on the gas and liquid inlets and outlets of the pump, moreover, the suction valve of the gas inlet of the pump is located between the working cylinder and the discharge valve.

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