RU2617769C1 - Technological complex for tanks neutralisation after nitrogen oxidators draining - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: technological complex contains nitrogen oxide removal system 1, including storage tank 11 and vacuum compressor pump10, heated water tank 2 with metering pump 3, tanks 4 and 5 with process solutions, discharge nozzles of which with stop valves 26 and 27 are connected by a pipeline, and the pipeline is connected to the suction pipe of the second metering pump 6. Pumps 3 and 6 are connected to neutralised tank 14. The gas space of tank 14 is communicated with nitrogen oxidant vapour neutralisation system 7 and drying system 8 of the inner surface of tank 14, at the outlet of which check valve 37 is installed. The discharge connection of the first metering pump 3 is additionally connected to additional container 9 for neutralisation products.

EFFECT: quick and effective neutralisation of the tank after nitrogen oxidants draining with minimal labour and time costs.

1 dwg, 2 tbl

Description

The invention relates to devices for neutralizing storage and transportation means from residues of toxic liquids, in particular from nitrogen oxidizing agents, and can be used at storage and transportation facilities of nitrogen oxidizing agents, as well as in automated process control systems for neutralizing storage means.

Known mobile technological complex for cleaning tanks containing equipment installed on the vehicle, which includes a washing fluid supply system and a system for pumping out washed-out deposits. The complex includes facilities for gravitational separation of contaminated liquids, water purification, pre-treatment of oil products and disposal of solid and jelly-like waste (RU No. 86506, IPC V08V 9/08, 9/093, 19.5.2009).

The disadvantage of this technological complex is that its equipment has a different purpose and cannot be used to neutralize the inner surface of the tanks after the discharge of nitrogen oxidizing agents.

A known installation for cleaning equipment from nitrogen-containing compounds, containing a tank with a process fluid, a pump, a control valve, a source of compressed gas, a neutralization device, a process fluid heater (SU 2002525 C1, 11/15/1993).

 The disadvantages of this installation is:

the lack of the ability to remove the “non-leaking” residue of a nitrogen oxidizing agent using its own equipment;

the lack of the possibility of a metered supply of water and technological solution to the neutralized tank leads to a sharp increase in the temperature of the solution of nitrogen oxidizing agent in the tank and uncontrolled emission of oxidizing agent vapors into the atmosphere;

the use of only one technological solution does not provide complete neutralization of nitrogen oxides;

significant impact on the environment due to the emission of nitrogen oxidant vapors from the tank during neutralization;

significant time costs for drying the inner surface of the tank.

 The technical result of the invention is to increase the efficiency and quality of neutralization of the inner surface of the tanks after the discharge of nitrogen oxidizing agents.

This technical result is achieved by the fact that the technological complex for neutralizing tanks after draining nitrogen oxidants, containing a heated water tank installed on the vehicle, a pump connected by a suction pipe to the drain pipe of the water tank, and a pressure pipe through individual shut-off valves, to the filling port of the tank for water and to a neutralizable tank, tanks with technological solutions, drain pipes of which are interconnected by a pipeline with shut-off valves According to the invention, it further comprises a second pump for the metered supply of technological solutions, the suction pipe of which is connected between the shut-off valves of the pipeline connecting the tanks to the technological solutions, and the pressure pipe to a neutralizable tank, a system for removing residual nitrogen oxidizing agents, consisting of a vacuum compressor pump and a tank -accumulator, the inlet pipe of which is connected by a pipe to a neutralizable tank, and the outlet pipe - with a vacuum pump-compressor, a pressure pipe to which is connected to neutralized the tank, the gas space is communicated with individual conduits with the additional administration system neutralization nitrogen oxidant vapor and the system dry inner surface neutralized reservoir, which outputs a check valve, wherein the discharge port of the first pump is further connected to the storage capacitance neutralization products.

The scheme of the technological complex for tank neutralization after the discharge of nitrogen oxidizing agents is shown in the drawing.

The technological complex for neutralizing reservoirs after draining nitrogen oxidizing agents contains a system 1 for removing residual nitrogen oxidizing agents from neutralizable reservoirs, a heated water tank 2 with a pump 3 for dosing a water supply, tanks 4 and 5 for technological solutions with a pump 6 for dosing a solution supply, system 7 neutralization of vapors of nitrogen oxidizing agents, system 8 for drying the inner surface of the neutralizable tank, storage capacity 9 of neutralization products and a control unit for the duration of neutralization operations (not shown).

System 1 for removing residual nitrogen oxidizing agents consists of a vacuum pump-compressor 10 and a storage tank 11, the inlet pipe of which is connected to the shut-off valve 12 by a pipe 13 with a neutralizable tank 14, and the inlet pipe (without position) is connected to a vacuum pump-compressor 10. Pressure the pipe (without position) of the vacuum pump-compressor 10 with a shut-off valve 15 is connected to a neutralizable reservoir 14.

The storage tank 11 with a volume of at least 0.3 m ³ is equipped with a level gauge 16 and a limit level sensor 17 connected to the control unit for the sequence of neutralization operations. To create a vacuum in the storage tank 11 and air pressure in the pipe 13 necessary for mixing the solutions in the neutralizable tank 14, an explosion-proof membrane vacuum pump-compressor with a pumping capacity of 220 dm ³ / min and a vacuum of at least 0.08 MPa is used. The power supply voltage of the electric motor is 220 V, the power is 1.0 kW.

The pump 3 for water with a suction pipe is connected to the drain pipe of the tank 2 for water, and the discharge pipe to the filler pipe of the tank 2. The drain and fill pipes of the tank 2 are equipped with individual shut-off valves 18 and 19. The pump 3 is connected to the neutralized tank 14 by a pipe 13, which is connected to the discharge pipe (out of position) with a metal hose (section aa). The suction and pressure pipes of the pump 3 are connected to the pipe 13 through the shut-off valves 20 and 21.

The water tank 2 with a volume of at least 2 m ³ is equipped with thermoelectric heaters 22, a water level indicator 23, a limit water level sensor 24 and a water temperature sensor 25. The level indicator 23 and the sensors 24 and 25 are connected to the neutralization control unit.

To ensure a metered supply of water into the neutralizable tank 14, a metering pump 3 with a productivity of 10-100 dm ³ / min with a drive from an electric motor with a capacity of not more than 1 kW is used. As an option, a metering pump of the NDM brand (NDMGEM) is used.

For the metered supply of technological solutions from tanks 4 and 5 to the tank 14, a metering pump 6 is used with a feed of 1 to 5 dm ³ / min, which is connected to tanks 4 and 5 through shut-off valves 26 and 27, and to the tank 14 through a shut-off valve valve 28, pipe 13 and metal hose (section aa). Alternatively, a metering pump NDM (NDMHEM) is used as the metering pump 6.

System 7 of neutralizing vapors of nitrogen oxidizing agents consists of a vaporizer made in the form of a tank 31 for a 10-15% aqueous solution of ammonia with a perforated pipe 32, which is connected to the gas space of the neutralized tank 14 with an individual pipe 33 and a metal hose (section 6-b), and the gas space of the tank 31 is in communication with the filter-absorber of oxidizer vapor 34, which is used as a chemical filter HSPK (HSPK-2C) TU 2183-5144484-2005. The volume of the tank 29 must be at least 0.5 m. The tank 29 is equipped with a level gauge 35 connected to the control unit.

The system 8 for drying the inner surface of the neutralizable tank consists of an air heater 36 equipped with a check valve 37, an individual air duct 38 and an air temperature sensor 39 connected to the neutralization control unit. Air line 38 is connected to a neutralizable reservoir 14.

The storage tank 9 of the neutralization products with a volume of at least 1.5 m ^{3 is} connected by a pipe 40 to the pressure port of the pump 3 for water. The tank 9 is equipped with a level indicator 41, a shut-off valve 42 at the inlet pipe and a limit level sensor 43. The level gauge 41 and the limit level sensor 43 are connected to the control unit. All tanks and tanks have nozzles with shut-off valves (without positions) in the lower part of the tank for their complete emptying.

The control unit for the sequence of neutralization operations is located in an individual compartment, connected to all functional systems of the technological complex and allows you to control the sequence and modes of technological operations. Indications from level sensors, temperature sensors, limit level sensors are displayed on the control unit panel in the form of a digital indication and light alarm. Information about closed and open shut-off valves is displayed on the control unit panel.

The technological complex has a device 44 for washing the inner surface of the tank 14, which can be used as a washing machine MMP-2/6, working pressure 0.63-1.0 MPa, fluid flow rate 3.6-6.8 m ³ / hours

The technological complex includes a metal hose (sections a-a and b-b) for connecting the technological complex to a neutralizable tank. All technological equipment of the complex assembly is located on the chassis of the KamA3-53501 car with a carrying capacity of not more than 10300 kg.

All pipelines of the technological complex are equipped with electromagnetic shut-off valves connected to the control unit for the sequence of neutralization operations.

Energy supply of the technological complex is carried out from a 3-phase alternating current generator with a capacity of at least 12 kW driven by a base chassis engine through a power take-off.

From the practice of operating tanks, railway and automobile tanks intended for storage of transportation of nitrogen oxidizing agents, it is known that after the oxidizer is drained by a centrifugal pump, the so-called “non-leaking” residue remains, the amount of which is from 30 kg in tanks with a capacity of 2 m to 300 kg in tanks with a capacity of 100 m ³ , in railway tanks - from 50 to 70 kg and automobile tanks from - 15 to 20 kg.

In order to reduce the amount of oxidizable residue to be neutralized, the technological complex includes a system 1 for removing residues of nitrogen oxidizing agent, which allows reducing this residue by 4-5 times and thereby reduce the neutralization time, water consumption and technological solutions.

From the studies on the neutralization of nitrogen oxidizing agents it follows that to reduce the concentration of nitrogen oxidizing agent in the tank to 5% and subsequent neutralization of the diluted solution per 1 kg of oxidizing agent it is required:

- 28-30 dm ^{3 of} water;

- 8 DM ³ 5% aqueous solution of ammonia;

- 0.3 dm ^{3 of a} 30% aqueous solution of hydrogen peroxide (a hydrogen peroxide solution is necessary to neutralize toxic ammonium nitrites generated during the neutralization of a nitrogen oxidizer with an ammonia solution).

The final product of the neutralization of nitrogen oxidizing agents with solutions of ammonia and hydrogen peroxide is ammonium nitrate (nitrogen fertilizer).

Thus, the set of distinctive features, namely, the second pump 6 introduced additionally for dosed supply of technological solutions, the system for removing residual nitrogen oxidizer 1 with a vacuum pump-compressor 10, system 7 for neutralizing the vapor of nitrogen oxidizing agent and system 8 for drying the inner surface of the neutralized reservoir, allowed the consumption of water and technological solutions to neutralize the remains of nitrogen oxidizing agents, to eliminate environmental pollution with toxic fumes of nitrogen ok numerator and reduce labor costs and time spent on the neutralization process.

The technological complex operates as follows.

Before starting work on the neutralization of tanks after the discharge of nitrogen oxidizing agents, the technological complex is being prepared for work:

- fill the tank 2 with water;

- fill tank 4 with a 5% aqueous solution of ammonia (at a negative ambient temperature, 10-12% ammonia solution);

- fill the tank 5 with a 30% aqueous solution of hydrogen peroxide;

- fill at 60% capacity the vaporizer (tank 31) with an aqueous solution of ammonia with a concentration of 10-15%.

At negative air temperatures turn on the alternator, turn on the thermoelectric heaters 22 in the tank 2 and heat the water to a temperature of 20-30 ° C. The water temperature is recorded by the sensor 25 and displayed on the control unit panel.

The car, which hosts the technological complex, drives up to the neutralized tank. Pipelines 13 and 33 of the complex are connected by metal hoses to a discharge pipe, and an individual air pipe 38 is connected to one of the nozzles of the tank 14. A temperature sensor 46 is installed on the level gauge 46, connected to the control unit.

Next, using the level gauge 45, the amount of nitrogen oxidizing agent in the tank 14 is determined and the system for removing the residue of nitrogen oxidizing agents is turned on. After removing the oxidant residue from the tank 14, the amount of the remaining oxidizing agent is determined, which must be neutralized directly in the tank 14. The required amount of water and technological solutions (ammonia and hydrogen peroxide) are determined by the amount of the remaining oxidizing agent to neutralize. Nitrogen oxidizer from the storage tank 11 is poured into a special container (not shown).

Then, a program of the sequence of performing the neutralization operation (table 1) and the operating modes of metering pumps 3 and 6 are entered into the control unit. The position of the electromagnetic shut-off valves during technological operations (table 2) is fixed on the control unit panel. Include a neutralization program.

In the process of supplying water and technological solutions to the tank 14, the vapor of a nitrogen oxidizing agent is released, which enters the vaporizer (tank 31) and is neutralized there. Oxidizer vapors that have not reacted with ammonia in tank 31 go into the vapor filter and are completely neutralized there.

After completion of the neutralization cycle, the neutralization products in the tank 14 are checked for the presence of nitrite ions by the RIB-NITRIT-TEST indicator strips. If nitrite ions are in excess of the permissible norms, a small amount of water (100-200 dm ³ ) and a 30% hydrogen peroxide solution (10-15 dm ³ ) are added to the neutralizable tank 14 and the solution is mixed again with air. The neutralization products from the tank 14 are pumped by the metering pump 3 into the storage tank 9, from which these products are periodically drained into a special storage (not shown).

After draining the neutralization products from the tank 14, a washing device 44 is installed in it, the metering pump 3 is turned on, the internal surface is washed and the water is drained from the tank 14 either into the technical sewer or to the ground with the same pump.

Then open one of the nozzles on the lid of the tank and turn on the system 8 for drying the inner surface of the tank 14. After drying, open the neck of the tank 14 and mechanically remove salts and other deposits from the inner surface of the tank 14 using nylon brushes, again rinse the inner surface with water and again dried system 8.

After completion of all operations performed by control by neutralization of ammonia, nitrogen oxides and nitrite ions in the tank 14 by means of test tubes (IT 2T for oxidizing nitrogen and TI-NH ₃ for ammonia -0.1). The metal hose is disconnected from the tank 14. The remaining solutions of ammonia and hydrogen peroxide in tanks 4 and 5 are used to neutralize the next tank. During a long interruption in work, water from tank 2 is poured onto the ground, and technological solutions into special containers (not shown).

The technological complex allows to increase the efficiency and quality of neutralization of the inner surface of the tank after the discharge of nitrogen oxidizing agents.

Claims (1)

A technological complex for neutralizing tanks after draining nitrogen oxidants, containing a heated water tank installed on the vehicle, a pump connected by a suction pipe to the drain pipe of the water tank, and a discharge pipe through individual shut-off valves, to the filling pipe of the water tank and to the tank to be neutralized, tanks with technological solutions, drain pipes of which are interconnected by a pipeline with shut-off valves, characterized in that it additionally contains there is a second pump for the metered supply of technological solutions, the suction pipe of which is connected between the shutoff valves of the pipeline connecting the tanks to the technological solutions, and the pressure pipe is connected to a neutralizable tank, a system for removing residual nitrogen oxidants, consisting of a vacuum compressor pump and a storage tank, an inlet pipe which is connected by a pipeline to a neutralizable reservoir, and the output one - to a vacuum pump-compressor, the discharge pipe of which is connected to a neutralizable reservoir en, whose gas space communicated with individual conduits neutralization system additionally introduced nitrogen oxidant vapor drying system and neutralized inner surface of the tank, wherein the outlet check valve while the discharge port of the first pump is further connected to the storage capacitance neutralization products.

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