KR100262718B1 - Solution Heat Regenerator Structure of Ammonia Absorption System - Google Patents

Abstract

PURPOSE: A fluid heating regenerator is provided to improve performance of regenerator and to enable downsizing by preparing an inner shell for increasing speed of refrigerant steam increasing from a lower area and by composing the regenerator into a double pipe type. CONSTITUTION: In a fluid heating regenerator, heat exchange coils(102,102') are equipped within a cylindrical shell(101) and an inlet(103) and an outlet(104) of refrigerant steam generated from the regenerator are prepared. An inlet(105) and an outlet(106) of strong solution and a distribution plate(107) are offered for flowing the solution in a thin film type on a surface of the heat exchange coils(102,102') by uniformly distributing strong solution let in from upper region on a top of the solution heating regenerator. Interior of the solution heating regenerator, an inner shell(110) is constituted for increasing speed of refrigerant steam occurring and increasing from the regenerator. Due to active contact of strong solution in a compact space, heat and substance transfer performance is enhanced and by adopting a double pipe method, a height is lowered during charged amount of solution is decreased.

Description

Solution Heat Regenerator Structure of Ammonia Absorption System

The present invention relates to an ammonia absorption system, and more particularly, to a structure of a solution heating regenerator for improving performance and miniaturization of a solution heating regenerator.

A typical ammonia absorption system is a burner (1) for generating heat, as shown in Figure 1, by applying the heat generated from the burner (1) by the refrigerant vapor from the strong solution (a solution having a high ammonia concentration) and the chemical solution A regenerator 2 for generating a solution having a weak ammonia concentration, a rectifier 3 for condensing water evaporated together with the refrigerant vapor generated in the regenerator 2 and rectifying the refrigerant vapor at a high concentration, and the rectifier ( 3) a condenser 4 for condensing the refrigerant with a high concentration of refrigerant vapor transferred from an intermediate medium such as cooling water or brine and condensing it into a liquid refrigerant, and the liquid condensed from the condenser 4; A precooler 5 for further subcooling the refrigerant, and an evaporator for evaporating the subcooled liquid refrigerant from the precooler 5 again using chilled water to boil the refrigerant in a two-phase state (liquid + gas phase). 6, with Expansion valve (7) for expanding the liquid refrigerant flowing into the evaporator (6), and the two-phase refrigerant evaporated from the evaporator (6) passes through the precooler (5) to exchange heat with the relatively high temperature liquid refrigerant It is further boiled after performing the refrigerant vapor state, and the counter current between the refrigerant vapor introduced into the absorber 8 and the absorber 8 into which the refrigerant vapor generated from the refrigerant vapor and the regenerator 2 flows ( Absorption occurs by contacting the counter current to generate a strong solution of the initial concentration of the original regenerator (2) and collects in the lower part of the absorber (8). And an expansion valve 10 for expanding the chemical solution introduced into the absorber 8 from the regenerator 2.

The absorber (8) is a solution cooling absorber (11) in which a strong solution flows inside so that the generated strong solution flows into the regenerator (2) through the rectifier (3) and heat exchanges with the medicinal solution produced in the regenerator (2). And a water cooling absorber 12 having a cooling water flowing therein to allow heat exchange while the refrigerant vapor introduced from the evaporator 6 into the absorber 8 rises, and the solution and the medicinal solution branched from part A of FIG. It is composed of a GAX absorber / regenerator 13 to reduce the amount of heat required in the regenerator by generating a refrigerant vapor by heat exchange of the.

And between the regenerator 2 and the rectifier 3 is located an analyzer (15) in which a baffle plate (14) is zigzag arranged in a cylindrical shell, and the analyzer (15) and the regenerator (2) are located. ) Is a solution heating regenerator 16 for reducing the load of the regenerator 2 by heat-exchanging the strong solution flowing from the upper portion, the refrigerant vapor and the medicinal solution generated from the regenerator 2.

To this end, the solution heating regenerator 16, as shown in Figure 2, the heat exchange coil 18 is located in the cylindrical shell 17, the stratification of the concentration, the strong solution flowing from the top and the bottom rises The baffle plate 19 for forming the flow path of the refrigerant steam is arranged in a zigzag.

In the conventional absorption type system configured as described above, the steel solution in the regenerator 2 is heated by the burner 1, which is a combustion unit, to generate refrigerant vapor and a medicinal solution, and the generated medicinal solution has a specific gravity higher than that of the steel solution to the bottom of the regenerator. It sinks, flows into the heat exchange coil 18 inlet of the solution heating regenerator 16 and flows therein, and the refrigerant vapor rises.

At this time, since the chemical solution is the highest temperature in the system, the heat exchanger acts as a heat exchanger with the steel solution outside the heat exchange coil 18 while flowing inside the heat exchange coil 18, thereby depriving the heat of the steel solution, thereby lowering the temperature. do.

As such, the solution heating regenerator 16 serves to reduce the amount of regeneration heat in the regenerator 2 through heat exchange between the chemical solution in the heat exchange coil 18 and the external strong solution.

Here, the baffle plate 19 of the solution heating regenerator 16 forms a steel solution falling from the upper portion and a flow path of the refrigerant vapor rising from the lower portion, and the refrigerant vapor rises along the flow path to the analyser 15. Inflow.

The analyzer 15 has a structure in which the baffle plate 14 is arranged in a zigzag manner, and when steel solution flows from the upper portion of the analyzer 15, gravity is along the baffle plate 14 inside the analyzer 15. Direction, the refrigerant vapor generated from the regenerator 2 rises in the opposite direction, in contact with the strong solution, desorbs the absorbent component and increases the concentration of the refrigerant vapor.

Thereafter, the refrigerant vapor is introduced into the rectifier (3), and the refrigerant vapor introduced into the rectifier (3) and the strong solution flowing into the rectifier (3) through the pumping of the solution pump (9) from the absorber (8) After heat exchange, it is condensed with the evaporated water and rectified with high concentration of refrigerant vapor.

The medicinal solution flowing along the heat exchange coil 18 of the solution heating regenerator 16 is expanded in the expansion valve 10 by the pressure difference between the regenerator 2 which is the high pressure part and the absorber 8 which is the low pressure part, and then the absorber ( Inflow to the top of 8).

The high concentration refrigerant vapor rectified by the rectifier (3) flows into the condenser (4) and exchanges heat with the low temperature cooling water flowing around the condenser (4) to condense in the liquid refrigerant state, the liquid refrigerant is precooler (5) After passing through the liquid refrigerant in a more subcooled state, the subcooled liquid refrigerant is expanded through the expansion valve (7) and then flows into the evaporator (6).

The liquid refrigerant introduced into the evaporator 6 is boiled into a refrigerant in a two-phase state (liquid + gaseous phase) by exchanging heat with hot cold water flowing around the evaporator 6, and the refrigerant in this two-phase state is again a precooler ( As it passes through 5), it heat-exchanges with the liquid refrigerant which is relatively hot, and further boils to form refrigerant vapor, which flows into the lower part of the absorber (8).

The refrigerant vapor introduced into the absorber 8 is absorbed by the medicinal solution while rising in contact with the medicinal solution introduced from the regenerator 2 in a counter current while generating a strong solution. It is offset by the cooling water flowing in the cooling absorber 12 and the low temperature strong solution flowing in the solution cooling absorber 11.

Here, the medicinal solution generated in the regenerator 2 is cooled while being dispersed and dropped on the surface of the heat exchange coil of the solution cooling absorber 11 in which the low temperature strong solution flows after flowing into the upper part of the absorber 8 to accelerate the absorption of the refrigerant vapor. .

At this time, the steel solution accumulated in the lower part of the absorber (8) is introduced into the rectifier (3) by the pumping of the solution pump (9) is introduced into the solution cooling absorber (11), the steel solution flows through the heat exchange coil inside The heat is exchanged with the high temperature chemical solution generated from the regenerator 2 and the temperature is raised and then flowed back into the regenerator 2 to repeat the above operation sequentially.

This absorption cycle is a heat pump of cooling and heating function. In the case of cooling, the cooling water can be obtained from the latent heat of evaporation of the refrigerant in the evaporator 6, and in the case of heating, the latent heat of condenser 4 Heating water can be obtained from the heat of absorption of the water cooling absorber 12.

This is accomplished by continuously cycling in equilibrium while the system is operating.

However, in this conventional ammonia absorption system, the solution heating regenerator has a pool boiling shape immersed in the solution, thus increasing the amount of filling of the solution, and a baffle plate disposed between the heat exchange coils for the stratification of the concentration. Due to the problem of increasing the height.

In view of this point, the present invention provides a solution heating regenerator in a double tube type, and has an inner shell for increasing the speed of refrigerant vapor rising from the bottom thereof, thereby improving performance and miniaturization of the solution heating regenerator. There is a purpose.

1 is a cycle diagram of a typical ammonia absorption system.

2 is a configuration of a solution heating regenerator of the conventional ammonia absorption system.

3 is a configuration of a solution heating regenerator of the ammonia absorption system according to the present invention.

Figure 4 is a block diagram of a heat exchange coil of the solution heating regenerator according to the present invention.

5 is an internal shell configuration of the solution heating regenerator according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

101: shell 102, 102 ': heat exchange coil

103: refrigerant steam inlet 104: refrigerant steam outlet

105: steel solution inlet 106: steel solution outlet

107: distribution plate 108: chemical solution inlet

109: chemical solution outlet 110: inner shell

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of a solution heating regenerator of the ammonia absorption system according to the present invention, in which heat exchange coils 102 and 102 'are provided in a cylindrical shell 101, and are generated from a regenerator (not shown in the drawing). The inlet 103 and the outlet 104 of the refrigerant vapor, the inlet 105 and the outlet 106 of the steel solution flowing from the upper portion, and the steel solution flowing from the upper portion are uniformly distributed at the upper end of the solution heating regenerator. A distribution plate 107 is provided on the surfaces of the coils 102, 102 ′ for flowing in a thin film form.

In addition, the heat exchange coils 102 and 102 'have a double tube type as shown in FIG. 4, and the heat exchange coils 102 and 102' have an inlet 108 for the chemical solution generated from a regenerator (not shown). ) And an outlet 109 are formed.

In addition, as shown in FIG. 5, an inner shell 110 is formed inside the solution heating regenerator to increase the speed of the refrigerant vapor generated and rising from the regenerator.

Referring to the operation of the present invention configured as described above is as follows.

First, the strong solution inside the regenerator is heated and separated into a refrigerant vapor and a medicinal solution state, and the medicinal solution flows into the medicinal solution inlet 108 of the double tube type heat exchange coils 102 and 102 'and exchanges heat exchange coils 102 and 102. ') Will flow inside.

Meanwhile, the refrigerant vapor rises and flows into the refrigerant vapor inlet 103 of the solution heating regenerator, and the strong solution flows into the upper liquid solution inlet 105 and is distributed by the distribution plate 107, thereby allowing the heat exchange coil ( 102, 102 ') in a thin film form.

At this time, the steel solution flowing in the form of a thin film on the surface of the heat exchange coils 102 and 102 'exchanges heat with the medicinal solution flowing through the heat exchange coils 102 and 102', and also transfers refrigerant vapor, heat transfer, and mass transfer. The inner shell 110 mounted inside the solution heating regenerator is performed to increase the speed of the refrigerant vapor rising from the bottom, thereby enabling active heat transfer and mass transfer in the reduced space.

Here, the configuration of the heat exchange coils 102 and 102 'in a double tube type is to reduce the height while obtaining an equivalent amount of heat as compared to the conventional solution heating regenerator.

As described above, the present invention can improve the heat and mass transfer performance by actively contacting the refrigerant vapor rising from the lower part of the regenerator and the strong solution flowing from the upper portion of the solution heating regenerator in a more compact space. Employment can reduce the height and at the same time reduce the amount of filling of the solution.

Claims (3)

It exchanges heat with the strong solution flowing from the upper part, the medicinal solution and the refrigerant vapor generated from the regenerator to reduce the load of the regenerator. For this purpose, the heat exchange coil in which the medicinal solution generated from the regenerator flows into the cylindrical shell is flowed. In the solution heating regenerator of the equipped ammonia absorption system, Solution heat regenerator structure of the ammonia absorption system, characterized in that the heat exchange coil of the solution heating regenerator is configured in a double tube type. The method of claim 1, The solution heating regenerator structure of the ammonia absorption system, characterized in that the inside of the solution heating regenerator is provided with an inner shell for increasing the speed of the refrigerant vapor rising from the bottom. The method of claim 1, The solution heating regenerator structure of the ammonia absorption system, characterized in that the upper end of the solution heating regenerator is provided with a distribution plate for evenly distributing the strong solution flowing from the top to flow in the form of a thin film on the surface of the heat exchange coil.

Images