RU48024U1 - AMMONIUM WATER STORAGE DEVICE - Google Patents

Abstract

The utility model relates to a device for receiving, storing and dispensing ammonia water to consumers. A device for storing ammonia water contains a discharge point 1, an intermediate tank 2, working tanks 3, pumps, a piping system 11, a separator 8, compressors 9 and receivers 10. It contains at least three working tanks with a volumetric filling factor of not more than 0.9 . In addition, it is equipped with at least one auxiliary tank 7 in an empty state under nitrogen pressure, a drain tank 4, a drainage tank 6 and an absorption tank 5 filled with chemically purified water of not more than 65% of the volume with the possibility of its circulation and at a temperature of + 5 ° С to + 20 ° C. The piping system 11 is made with insulation or with insulation and heating.

Description

This claimed utility model relates to a device for receiving, storing and dispensing ammonia water to consumers.

The closest analogue to the claimed utility model is a device for storing ammonia water (Prince Yu.A. Ivanov, I.I. Strizhevsky "Storage and transportation of liquid ammonia", M "Chemistry" 1991,), containing a discharge point, an intermediate tank, working tanks, separator, pumps, piping system, compressors and receivers.

The disadvantages of this device are the lack of additional reservoirs in the event of emergency leaks and loss of ammonia water.

The inventive utility model allows to ensure compliance with environmental requirements, and also eliminates accidental leaks and loss of ammonia water.

The technical result is achieved due to the fact that the device for storing ammonia water, containing a drain, an intermediate tank, working tanks, a separator, pumps, a piping system, compressors and receivers, contains at least three working tanks with a volumetric filling factor of not more than 0, 9, while additionally equipped with at least one auxiliary tank in an empty state under nitrogen pressure to collect emergency leakages of ammonia water, a drain tank for ammonia residues hydrochloric water drain tank to avoid loss of ammonia water absorption and discharge tank for ammonia and nitrogen vapors filled with demineralized water not more than 65% of the volume, with its circulation and at a temperature range from + 5 ° C to + 20 ° C.

Figure 1 presents the technological diagram of a device for storing ammonia water.

A device for storing ammonia water contains a discharge point 1, an intermediate tank 2, working tanks 3, a drain tank 4, an absorption tank 5, a drainage tank 6, an auxiliary tank 7, a separator 8, compressors 9, receivers 10, and a piping system 11.

A device for storing ammonia water works as follows. Ammonia water (industrial ammonia water) from the railway tank located at discharge point 1 through a removable metal hose and system

pipelines 11 by gravity enters the pre-blown and nitrogen-filled intermediate tank 2.

The filling of the intermediate tank 2 is due to the difference in the levels of ammonia water in the tank and in the tank. Moreover, as the level of ammonia water rises in the tank, the pressure also rises in the latter. From the discharge point 1, ammonia water is pumped through a pipeline system 11 laid along the shop floors to one of the working tanks 3, prepared in advance for filling.

As the railway tank is emptied and the level of ammonia water decreases in it, the level and pressure in the intermediate tank 2 decrease. In order to prevent overflow of the intermediate tank 2, in case of any irregularities, a system of automatic shutdown of the tank with the help of electric actuating valves triggered from the level gauge ( not conventionally shown in the diagram).

Residues of ammonia water from the metal hose (before it is disconnected from the tank) and piping systems 11 are drained into the drain tank 4. Leaks from centrifugal pump seals (not shown conventionally) are also sent to the drain tank 4. As filling, the drain tank 4 is freed from ammonia water with nitrogen. Ammonia water from the drain tank 4 is transferred to the drain tank 6, while the complete emptying of the drain tank 4 is not allowed. After emptying the nitrogen from the drain tank 4 is discharged through a candle into the atmosphere.

The working tanks 3 operate alternately: one for the delivery of ammonia water, the other for the reception of ammonia water or its storage.

Ammonia water working tanks 3 are filled in turn after emptying. Storage of ammonia water in tanks is carried out under a nitrogen pressure ("nitrogen pad") of 0.05-0.07 MPa (0.5-0.7 kgf / cm ² ), delivery to consumers under a pressure of 0.15 MPa ( 1.5 kgf / cm ² ). The initial filling of the working tanks 3 with ammonia water is carried out after preliminary purging and filling them with nitrogen. Coming into the working tank 3, when it is filled, ammonia water displaces nitrogen and ammonia vapors from it, which are sent through a piping system 11 to the absorption tank 5 filled with chemically purified water. Upon reaching a pressure in the working tank of 3 0.05 MPa (0.5 kgf / cm ² ), discharge into

the absorption tank 5 is stopped. The pressure reduction rate in the working tank 3 should not exceed 0.1 MPa / h (1 kgf / cm ² / h). After reducing the pressure, the working tank 3 can again be filled with ammonia water. The volumetric coefficient of filling with ammonia water of the working tanks 3 should not exceed - 0.9.

To avoid overfilling with ammonia water, each working tank 3 is equipped with a system for automatically shutting it off with the help of electric actuators that are triggered according to the readings of the level gauge (not shown conventionally in the diagram).

Nitrogen coming from the compressors 9 into the working tank 3 is supplied from the piping system 11 through a reducing device.

The delivery of ammonia water to the network is carried out by nitrogen pressure in the working tank 3, which is maintained constant at 0.15 MPa (1.5 kgf / cm ² ) using a direct-acting pressure regulator. The technological scheme provides for the possibility of dispensing ammonia water to consumers also using screw pumps. During the operation of screw pumps, the pressure in the working tank is maintained at the level of 0.02-0.05 MPa (0.2-0.5 kgf / cm ² ). Upon reaching the minimum level in the working tank, it is disconnected from:

- collectors for the delivery of ammonia water;

- nitrogen supply manifolds.

Ammonia water from one of the working tanks 3 can be dispensed for filling a tanker using one of the centrifugal pumps (not shown conventionally in the diagram). When filling the tank with ammonia water, the gas phase (nitrogen, ammonia vapor) from it is sent to the working tank 3 from which the gulf is made. The connection of the tank truck to the collectors of the device is carried out using hoses (liquid and gas), which must be tested for leaks with nitrogen before filling. After filling the tanker, ammonia water from the liquid hose is drained into the drainage tank 6.

The ammonia water storage device is provided with a collector circuit for connecting the piping system 11. In this case, the piping system 11 can be made with insulation or with insulation and heating. This scheme allows you to free from ammonia water, if necessary, one of the working tanks 3 in any other working tank using centrifugal

pumps. When pumping ammonia water, the gas phase (nitrogen, ammonia vapors) after equalizing the pressure from the filled tank through the piping system 11 is sent to the empty working tank 3. In exceptional cases (for example, when a leak occurs in one of the working tanks 3 and two other tanks are completely filled ) pumping of ammonia water from the working tank by centrifugal pumps to the auxiliary tank 7. Storage of ammonia water in the auxiliary tank 7 is not allowed. During normal operation, the auxiliary tank 7 should be in an empty state under a nitrogen pressure of 0.05-0.07 MPa (0.5-0.7 kgf / cm ² ), ready to receive ammonia water in case of any emergency. The auxiliary tank 7 is also designed to receive ammonia water in case of emergency spillage into a reinforced concrete sump in which the working tanks are installed 3. Ammonia water from the pit located in the sump and equipped with a level gauge is fed to the suction by a centrifugal pump and then sent to the auxiliary tank 7 The gas phase (nitrogen, ammonia vapor) from the auxiliary tank 7 is discharged into the absorption tank 5.

During the evacuation of ammonia water from the sump, control is carried out using remotely controlled valves with an electric drive. To eliminate losses of ammonia water, a leaking and drainage collection system is provided, including a drainage tank 6 and drainage pipelines.

Ammonia water from the drainage tank 6 is pumped into the working tank 3, from which ammonia water is not given out to the network at this moment.

In order to prevent ammonia vapor from entering the atmosphere, all discharges are collected and sent according to the technological scheme to the absorption tank 5, in which ammonia is trapped by water to form ammonia water. For this, the absorption tank 5 is constantly filled with chemically purified water, and the ammonia content in the water is systematically monitored. Pouring chemically purified water into the absorption tank 5 with a preliminary control of its quality is carried out from a tanker. Monitoring when water is poured into the absorption tank 5 or when ammonia water is drained from it is carried out using a level gauge installed on the tank. The level of chemically treated water at the bay should not exceed 65% of the tank volume (1400 mm). The temperature of the water in the absorption tank 5 should be in

temperature conditions from + 5 ° С to + 20 ° С. The necessary temperature regime is ensured by the supply of heating water to the radiators of the absorption tank 5 in the cold season. To prevent freezing of the water poured into the absorption tank 5, in case of heating shutdown, as well as to average the composition of ammonia water in the tank, it is possible to circulate using a centrifugal pump.

When the ammonia content is not more than 15%, ammonia water from the absorption tank 5 is pumped by centrifugal pumps to one of the emptied working tanks 3 for subsequent use. If it is not possible to use ammonia water from the absorption tank with 5 centrifugal pumps, it is pumped into a tank truck for shipment to other consumers.

Workers 3, auxiliary 7 and intermediate 2 tanks are equipped with two safety valves with a switching system, which allows, if necessary, to remove one of the valves for repair without stopping the tank.

During normal operation on the working 3 and auxiliary 7 tanks, the switching devices (not shown conditionally in the diagram) must be in such a position that only those safety valves (“working”) are in operation, the discharge from which is directed to the absorption tank 5. ""safety valves on the working 3 and auxiliary 7 tanks are included in the work only if the" working "safety valves are removed. The discharge from the “backup” safety valves is directed to the separator 8. In the event of an ammonia water level in the separator 8, it can be piped into the absorption tank 5. To purge the equipment and collectors, as well as to create a “nitrogen pad” in the working tanks 3 when storing ammonia water and delivering it to the network, consumers are provided with compressors (nitrogen production units), after which production nitrogen (volume fraction of nitrogen is not less than 97%, volume fraction of oxygen not more than 3%) with a pressure of 0.5 MPa (5 kgf / cm ² ) pic blunts into the receivers 10 and further into the piping system 11 of the device for storing ammonia water. The piping system 11 and equipment are purged with nitrogen using rubber hoses connected to nitrogen extraction units. Ammonia water is supplied to consumers through a system of pipelines 11 under the pressure of a "nitrogen pad" or using single-screw pumps.

Claims (3)

1. A device for storing ammonia water, containing a discharge point, an intermediate tank, working tanks, pumps, piping, a separator, compressors and receivers, characterized in that it contains at least three working tanks, with at least one auxiliary tank in the empty condition under nitrogen pressure to collect emergency leakages of ammonia water, a drain tank for residual ammonia water, a drain tank to exclude losses of ammonia water and an absorption tank for discharge and nitrogen and ammonia vapors filled with chemically purified water with the possibility of its circulation. 2. A device for storing ammonia water according to claim 1, characterized in that the piping system is made with insulation. 3. A device for storing ammonia water according to claim 1, characterized in that the piping system is made with insulation and heating.