Cryogenic liquid evaporator

FIELD: heating.

SUBSTANCE: present invention pertains to heat technology and can be used in cryogenics for evaporating gaseous media in liquid state, in rocket and space technology and in the national economy, for example, for gasification of condensed gases and their mixtures. The cryogenic liquid evaporator has case 1, made in form of double-layer cylindrical casings 2, 3, forming circular cavity 4, for passing through a heating heat-carrier. Each of casings 2, 3, consists of two cylinders, rigidly joined together, between which channels 5, are formed, joined into collectors 6, 7 for inlet and collectors 10, 11 for outlet of cryogenic product. At the inlet of the circular cavity 4, there is cover 14, on which are fitted mixing elements 15 and auxiliary device 18. At the outlet there is gas inlet 21.

EFFECT: wider functional capabilities of the evaporator and improvement of its technical characteristics.

6 cl, 2 dwg

 

The invention relates to the field of heat and can be used in cryogenics for evaporating gaseous media, in liquid state, in the space industry and in the economy, for example, for the gasification of liquefied gases and their mixtures.

To solve advanced engineering problems there is a need in the evaporator-gasifier with a developed surface heating, compact, simple in design, low mass, relatively high costs (more than 10 kg/s) of evaporated coolant and is operable at high pressures (>10 MPa).

Known evaporator cryogenic liquid (the evaporator), comprising a housing located therein concentric walls, the coil cryogenic product, made of two parts, one of which is located between the housing and the partition, and the other between the walls, heaters, located in the Central part of the body. The space between the casing and the outer wall is filled with water, forming ice screen (A.S. No. 932094, CL F17C 9/02, 1982 - prototype).

The main disadvantages of this evaporator are:

- the use of water in the device complicates the design limits the selection of the maximum temperature and pressure of the coolant, which in turn leads to the constraint m is xymalos thermal power the increase in the overall weight of the structure and increase the time the device mode and, in addition, imposes additional requirements to comply with the tightness of the housing, and to the purity of the water used;

the heaters have a limited life and their presence leads to the need to have the power to them with control equipment;

- the cost of 1 KW of heat energy obtained by using electric heaters, above the cost of the same amount of energy obtained from the combustion of fuel.

The invention aims to remedy these disadvantages and improve the technical characteristics and functionality of the evaporator.

This object is achieved due to the fact that in the proposed evaporator, comprising a housing, which houses the heat exchange elements, heater, according to the utility model, the body is made in the form of a two-layered cylindrical shells forming an annular cavity for passage of a heating fluid, each of the shells comprises two rigidly interconnected cylinders, between which is formed the channels, connected to the reservoir inlet and exhaust cryogenic product, while at the entrance to the annular cavity of the fixed cover, which is equipped with mixing elements and flammable condition the device, and the output is fixed gasovod.

For the generation of heat of the coolant in the temperature range from C to C installed in the lid of the mixing elements, such as nozzles for the combustion of fuel and flammable fuel-air mixture device.

For increasing values of heat transfer coefficient from the heat of the evaporated coolant to the environment, one of the cylinders (by heating of the heat carrier) of each of the shells is made of material with high thermal conductivity.

To control the temperature coming out of the annular space of the coolant gasovod contains a device that allows you to make the gas flow environment, lowering its temperature to the desired value.

To reduce heat loss into the surrounding space on the body and gasovod applied insulation.

The invention is illustrated by drawings, where figure 1 shows a longitudinal section of the evaporator, and figure 2 - section a-A.

The main constituent elements of the proposed device are

1 - body;

2 - inner sheath;

3 - the outer casing;

4 - ring cavity;

5 - channels for the passage of the evaporated environment;

6, 7 - reservoir inlet;

8, 9 - supply pipeline;

10, 11 - reservoir tailrace;

12, 13 to the outlet pipe;

14 - cover;

15 - mixing elements;

16, 17 - Petruk the supply of the combustible mixture;

18 - flammable device;

19 - the bottom;

20 - reliance;

21 - gasovod;

the 22 - unit temperature control facing the heating environment;

23 insulation.

The evaporator comprises a heat-insulated housing 1 consisting of the inner shell 2 and the outer cylindrical shell 3, which form between them an annular cavity 4 is carried out between the channels 5, at the entrance which made the collectors 6, 7 with the inlet pipes 8, 9, and the output of the collectors 10, 11 with the discharge pipes 12, 13.

The housing 1 is closed on one side by a cover 14, which is equipped with mixing elements 15 with the inlet fuel-air mixture nozzles 16, 17 and flammable device 18.

On the other hand, the housing 1 is equipped with a bottom 19 of the support 20 and gazivoda 21 with the installed device 22 to control the temperature leaving the heating medium.

Bearing 20 is able to slide on the inner cylindrical part of gazivoda 21 during heating or cooling of various parts of the structure.

On the outer surface of the bottom 19 and gazivoda 21 applied insulation 23.

The evaporator operates as follows.

Evaporated environment, such as a cryogenic liquid, served two threads on the inlet pipes 8.9 in the reservoirs 6, 7 and channel 5 of the inner shell 2 and outer casing 3 arrives, the village is epano steaming, to collectors 10, 11 from which is discharged through the discharge pipes 12, 13 in the direction of the consumer.

For evaporated environment may be implemented as "flow"and "counter-current" (in relation to the movement of the heating medium).

The heating medium ( coolant) - the products of combustion of any fuel, such as kerosene, alcohol, natural gas and so on, the temperature of which may reach from C to C (governed by the ratio of costs of fuel components) and is limited only by the properties of the materials used, moving from the fire wall of the cover 14 in the direction of gazivoda 21 on the way, giving heat to the vaporized medium flowing through the channels 5 shells 2 and 3.

Preparation of fuel to the combustion process (mixing, spraying) is the mixing elements 15, and to ignite the mixture is device 18.

The temperature of the combustion products at the exit of the heat exchanger may be higher than the maximum allowable for the consumer, for example a turbine generator. For lowering the temperature leaving the heating medium is used, the device 22, which allows the introduction into the flow of a quantity of fuel used, to reduce the temperature of the combustion products to the required size.

The use of the invention will:

to renounce the use of water in the evaporator;

p> - to improve the technical characteristics of the evaporator due to the temperature increase (up to C) heating the heat carrier and increasing the flow of evaporated environment (≥10 kg/s) and pressure (≥10 MPa);

- use evaporated environment, such as natural gas, as fuel components when generating the heat of the coolant;

- to extend the functionality of the evaporator due to the additional use of disposable heat of a heating fluid, for example, to drive the turbine generator or heating any additional protection.

1. The evaporator cryogenic liquid, comprising a housing, which houses the heat exchange elements, the heater, wherein the body is made in the form of a two-layered cylindrical shells forming an annular cavity for passage of a heating fluid, each of the shells comprises two rigidly interconnected cylinders, between which is formed the channels, connected to the reservoir inlet and exhaust cryogenic product, while at the entrance to the annular cavity of the fixed cover, which is equipped with mixing elements and flammable device, and the output is fixed gasovod.

2. The evaporator according to claim 1, characterized in that the mixing elements in the form of two stage injectors.

3. The evaporator according to claim 1, distinguishing the I, in gazivode has a device for regulating the temperature leaving the heating medium.

4. The evaporator according to claim 1, characterized in that the inner cylinder is made of material with high thermal conductivity.

5. The evaporator according to claim 1, characterized in that the nozzle gazivoda installed the mobile base.

6. The evaporator according to claim 1, characterized in that on the housing and gasovod applied insulation.



 

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