DE102006011429A1 - Sorption system operating method for mixture of two substances, involves conducting heat from heat source through main and auxiliary circuits for steam expulsion, and adjusting proportions of sorbent and solvent of circuits - Google Patents

Abstract

The method involves determining working medium portion and recirculated quantity of solutions in main and auxiliary circuits (1a, 39a). Heat from a heat source (5) is conducted through the circuits for steam expulsion. Proportions of sorbent and solvent of high steams of the circuits are adjusted. High pressure steams of loops are released together for production of mechanical energy, where a pressure level of absorption is higher in the auxiliary circuit than in the main circuit.

Description

The invention relates to a method of working a sorption system for a binary mixture with main and auxiliary circuit as an additional application to the patent DE 10 2005 005 409.9 ,

• • einem Hauptkreislauf wird ein Zusatzkreislauf mit dem gleichen Zweistoffpaar hinzugefügt,
• • Arbeitsmittelanteil und Umlaufmenge in den Lösungen des Hauptkreislaufs bzw. des Zusatzkreislaufs von einander abweichend festgelegt werden,
• • externe Wärmeenergie wird zur Dampfaustreibung im höherem Temperaturbereich an den Hauptkreislauf, in darunter liegenden Temperaturbereich an den Zusatzkreislauf übertragen,
• • die Hochdruckdämpfe des Hauptkreislaufes und des Zusatzkreislaufes werden auf gleichem Druckniveau erzeugt,
• • die Hochdämpfe des Hauptkreislaufes und des Zusatzkreislaufs werden bezüglich der Anteile von Sorptionsmittel und Lösungsmittel angeglichen,
• • die Hochdämpfe des Hauptkreislaufes und des oder der Zusatzkreisläufe werden gemeinsam zur Erzeugung mechanischer Energie entspannt,
• • das Druckniveau der Absorption wird im Zusatzkreislauf höher als im Hauptkreislauf festgelegt,

wobei mit unterschiedlicher Ausgestaltung des Zusatzkreislaufes der thermodynamische Kreislauf weiter ausdifferenziert wird.In the parent application, a thermodynamic cycle is described, which contains at least the following process steps:

• • an additional circuit with the same binary pair is added to a main circuit,
• • the proportion of working fluid and the amount of circulation in the solutions of the main circuit or the additional circuit are set differently from each other,
• • external heat energy is transferred to the main circuit for the expulsion of steam in the higher temperature range, and to the additional circuit in the lower temperature range,
• • the high-pressure vapors of the main circuit and the additional circuit are generated at the same pressure level,
• • the high vapors of the main circuit and the additional circuit are adjusted with respect to the proportions of sorbent and solvent,
• The high vapors of the main circuit and of the additional circuit (s) are relaxed together to generate mechanical energy,
• • the pressure level of the absorption is set higher in the auxiliary circuit than in the main circuit,

wherein with different configuration of the additional circuit of the thermodynamic cycle is further differentiated.

The Substantial of the parent application leaves formulate themselves into three concerns: The first concern is the design of the working process with additional circulation to that during the rectification process resulting Rückkühlwärme nutzstiftend to be installed in the absorption force cycle (circuit type method I). The second concern is the advantageous continuation of first task by a differentiated external heat to main and auxiliary circuit (method with circuit type II). The third concern is the advantageous continuation of the first and second Embodiments, wherein the heat utilization in the lower part of the temperature spread of the external heat source (Method with circuit type III) is exploited.

For the in Circuitry included in the parent application was To produce a high pressure steam from nearly pure working fluid and relax. The additional application sets out procedures with circuit switching the parent application to the use of saturated steam at low levels of the solvent further developed.

The circuits of the parent application are designed at least for the main circuit to a high pressure gradient. The relaxation of a saturated steam ends in the wet steam area. Under the same pressure conditions, such a relaxation makes less work than superheated steam with an almost pure single-substance steam. For binary mixtures, a different situation may exist if the sorbent has a significantly higher enthalpy. This is given to the couple ammonia and water. In the forming mist droplets is mainly the substance with the lower dew point - the solvent - included. This effect is decisive for the work of relaxation if the entropy of a binary does not fall or only slightly at pressure and temperature decrease. This causes an equally high or higher relaxation work as in a superheated steam of a single material pair. These properties of the two-component pair of ammonia and water at low water levels are the starting point of patents US 4346561 . US 6941757 by Alexander Kalina. However, the circuits used here differ significantly from those of the parent application. Due to the full evaporation of the binary mixture used in these Kalina circulation circuits in a two-phase mixture with subsequent separation in saturated steam and liquid, the installation of an additional circuit according to the parent application is not possible. From the investigations on such Kalina circuit circuits is well-known (Silke Köhler: "Geothermisch driven steam power process analysis and process comparison binary power plants" Diss. TU Berlin, 2005; P. 75-87, Pall Valdimarsson, Larus Eliasson: "Factors influencing the economics of The Kalina Power Cycle and Situations of Superior Performance ", International Geothermal Conference Reykjavik, 2003; pp.32-40) found that the highest efficiencies are achieved when the circuit is designed to contain a relatively small amount of the solvent in flash steam is.

It is the task of the invention, the benefits of the use saturated steam of a two-component mixture with the advantage of a higher working profit in thermodynamic cycles of Parent application due to their high pressure ratios combine.

The solution The task can be found in two independent claims and associated subclaims.

Of the Core of the present invention is instead of overheated High-pressure steam with high-pressure steam to start the relaxation.

The Methods proposed here are based on circuits that the Type II and Type III correspond to the parent application.

The Circuits of the parent application feature in a characteristic manner a high pressure ratio on. This would in a single relaxation machine usually for one safe operation too high steam at the end of the relaxation result. Therefore, in the circuits of the additional application becomes two-stage relaxation provided here as medium-pressure relaxation machine and low pressure relaxation machine referred.

There in the expulsion to high pressure level no nearly pure working medium vapor is to be generated, it makes sense the circuit without rectification designed in the high pressure range. Type I circuits of the parent application omitted in the additional application. There are two different main variants Application: In variant A, the expulsion is at high pressure level designed to balance the composition of the vapor to the solution at the end of the expulsion. This is done by parallel management of Heat off the external heat source and solution both in the HK high-pressure compressor and in the ZK high-pressure compressor. In variant B, only in the ZK high-pressure outlet driver is a parallel guide, in the HK high-pressure outlet driver provided a countercurrent flow, so that the expelled steam from both expellers the same Composition and temperature.

The latter Circuit causes the temperature of the steam when entering in the expansion machine is lower than the highest temperature in the expeller. In recirculating circuits with only one substance, this would have an efficiency reduction result. In the cited literature is proven that this is for Two-component mixtures do not apply: Two circuits lead to approximately the same power output: In the first circuit - with her is similar to the variant A - occurs in the expeller (Desorber) the lowest temperature difference between a heat source and the solution at the entrance and at the exit. In the second circuit - with her is the variant of B comparable - occurs, however, the slightest Temperature difference in the lower temperature range of the expeller and one with noticeable temperature difference at the outlet; though a larger mass circulation used and this the heat source must be exploited to a lower temperature. This condition is in the circuits of the parent application for the main cycle thereby Fulfills, that in the HK-Hochdruckaustreiber poor ZK solution is supplied. This corresponds to one indirect heat supply the heat source from a temperature range below the minimum temperature in the HK Hochdruckaustreiber. The variant B is therefore also in the circuits the additional application makes sense.

In the circuits of the additional application will after the first relaxation the wet steam by separation of liquid or by rectification again transformed into a saturated steam. In the latter case happens the transformation into a medium pressure rectifier. In countercurrent to the introduced wet steam passes through the rectifier solution, the as a relatively rich solution is introduced into the cold part of the rectifier. Here can the proportion of working fluid in the generated medium-pressure saturated steam compared to the process step, only the liquid be separated from the medium pressure wet steam, be increased. From the initiated solution Saturated steam is expelled. This expulsion can be due to heat in a medium pressure expeller connected to the medium pressure rectifier be enlarged. Can the heat source without lower temperature limit are used, so are circuits of the Type III of the parent application - ie with another medium pressure actuator either in the additional circuit or in the main circuit - effective applicable.

in the Compared to circuits with use almost pure overheated Arbeitsemitteldampfes the elimination of steam superheaters is beneficial affect the construction costs. In the technique used in the Kalina technique Full evaporation with subsequent separation in saturated steam and solution there is a risk of concentration of non-vaporizable trace substances, which have a corrosive effect and the heat transfer conditions deteriorate. In the circuits described are for expulsion apparatus from the Sorptionstechnik (Rieselaustreiber or Plattenaustreiber Heat Recovery Vapor Generator) are also used Danger does not exist.

in the Following are the embodiments the invention explained with reference to drawings. There are 6 figures attached.

The Figures show in detail:

1 A two-substance sorption plant with additional circuit for using the recooling heat as well as for the use of external heat at different pressure levels,

2 Additional circuit with relaxation by means of a single pressure stage,

3 Two-substance sorption plant with two-fold relaxation of a saturated steam in the main circuit and a single release of saturated steam in the additional cycle,

4 Medium pressure expander in the additional circuit and overheating of the medium pressure steam,

5 Medium pressure actuator in the main circuit and

6 a Tx working diagram with a schematic representation of the thermodynamic cycle.

The description of the parent application closest to the additional application can be found in the 9 and 10 , They are called 1 and 2 the additional application presented and described below.

In This application and the claims are for the terms Main cycle the abbreviation HK, for the term additional cycle (ZK), for the term additive pressure circuit (ZKM) used.

In the 1 is a absorption-force cycle according to the prior art (referred to as the main circuit) shown and extended by the additional circuit according to the invention: The main circuit has a HK-Hochdruckaustreiber 1 in which by external heat input 5 HK-work means high pressure steam 62 is expelled. This HK working fluid high pressure steam 62 becomes the ZK high pressure exporter 39 fed.

The additional circuit is supplied with heat twice at high pressure level: once in the ZK high-pressure compressor 39 , on the other hand in the second ZK output column 27 , In the latter, the expelled vapors of both circuits are rectified to a nearly pure working medium high pressure steam 017 , The recooling heat released in the rectification is converted by heat and mass transfer to the first partial flow of supercooled rich ZK solution 53 transferred to the expulsion and warming of the solution. The rectified working medium high pressure vapors of both circuits 017 have the same composition and temperature. They are working together in a superheater 30 from heat from an external heat supply 5 overheated, in a relaxation machine 31 Relaxed by releasing mechanical energy, by means of generator 32 is turned into electricity.

The working medium vapors of the main circuit and the additional circuit are in the expansion machine 31 separated. In the main circuit is relaxed to low pressure. The HK low pressure steam 18 is by means of liquid cooler 33 warmed up and in the HK / ZK low-pressure absorber 7a absorbs with heat removal to a cooling medium 64 , In the additional circuit is only relaxed to lower mean pressure and from the expansion machine 31 removed by removal. This ZK medium-pressure steam 63 is the lower ZK medium-pressure absorber 59 fed and absorbed there under heat.

In the additional circuit is a ZK medium pressure expeller 70 inserted, using heat from an external heat source 5 first in parallel by HK high-pressure ejectors 1 and steam superheater 30 , then through the ZK-Hochdruckaustreiber 39 and finally by ZK medium pressure drivers 70 to be led. The expelled ZK medium-pressure steam 71 is a ZK medium-pressure absorber under the same pressure 22 for absorption.

Between the ZK medium pressure driver 70 and the HK / ZK low pressure absorber 7a a medium / low pressure additional circuit is formed: the one from the centralized medium pressure compressor 70 expiring poor ZK solution 73 comes with the poor HK solution 14 united by a HK / ZK solution heat exchanger of the lower temperature range 66 directed to heat dissipation, by means of first HK / ZK throttle 74 brought to low pressure and the HK / ZK low-pressure absorber 7a fed. The ZK medium pressure driver 70 is via the associated fourth ZK output column 130 rich ZK solution 69 the medium / low pressure auxiliary circuit supplied by means of valve 67 from the main stream rich HK solution 0015 separated and by means of first ZK throttle 68 was lowered to medium pressure.

Between the ZK high-pressure outlet driver 39 and the HK / ZK low pressure absorber 7a the following additional circuit is formed: The poor ZK solution draining from the ZK high-pressure absorber 20 gets into the HK high pressure absorber 1 via its associated HK output column 16 initiated. Between HK high pressure absorber 1 and HK / ZK low-pressure absorbers find an opposing leadership of poor CC solution 20 and rich HK solution 015 instead of with the following effect: There is only a difference amount of rich HK solution 015 the HK high pressure absorber 1 from the HK / ZK low-pressure absorber 7a forwarded and poor ZK solution 20 of the high pressure / low pressure auxiliary circuit from the HK / ZK low pressure absorber 7a taken. This poor ZK solution 20 is by means of second ZK solution pump 51 brought to lower mean pressure and in the ZK medium-pressure absorber 59 the lower pressure stage by absorption to enriched ZK solution 61 transformed. This enriched ZK solution 61 is by means of third ZK solution pump 60 brought to medium pressure and in the ZK medium-pressure absorber 22 by absorption to rich ZK solution 24 transformed. This rich ZK solution 24 is by means of the first ZK solution pump 23 brought to high pressure and into two partial flows by means of valve 52 divided. A first part stream of the rich CC solution 53 is via the second ZK output column 27 and first ZK output column 26 into the ZK high-pressure compressor 39 initiated, the second part of the rich ZK solution 44 is successively by recirculation in the ZK medium-pressure absorber of the lower pressure stage 59 , the solution heat exchanger of the lower temperature range 66 and the middle temperature range 65 warmed up and over the first ZK output column 26 into the ZK high-pressure compressor 39 initiated.

Between HK-Hochdruckaustreiber 1 and HK / ZK low pressure absorbers 7a a main circuit consists of rich HK solution 15 and poor HK solution 14 , which, however, is modified by the superposition with the additional circuit. Rich HK solution 015 is calculated as a difference from the HK / ZK low-pressure absorber 7a taken by means of the first HK / ZK solution pump 8a raised to high pressure level by the HK / ZK solution heat exchanger of the lower temperature range 66 , then through the solution heat exchanger of the middle temperature range 65 and the upper temperature range 19 each headed for heat absorption and finally on the HK-output column 16 in the HK-Hochdruckaustreiber 1 initiated. Poor HK solution 14 is successively to heat dissipation by the HK-Hochdruckaustreiber 1 returned 13 , through the solution heat exchanger of the upper temperature range 19 and the middle temperature range 65 passed and by means of the first HK throttle 72 lowered to medium pressure and finally as already described the HK / ZK low-pressure absorber 7a fed.

Without the ZK medium pressure driver 70 would the amount of rectified working medium high-pressure steam, the expulsion in the ZK-Hochdruckaustreiber 39 and in the second ZK output column 27 - here by supplied Rückkühlwärme - is attributable completely to the two medium-pressure absorbers 59 . 22 be forwarded. The for enrichment of the solution in the ZK medium-pressure absorber 22 required amount of steam does not need the expansion machine 31 can be taken to medium pressure, but can be relaxed to low pressure and then the HK / ZK low pressure absorber 7a be forwarded.

In the 2 is opposite the 1 the decoupling of medium-pressure steam from the expansion machine 31 and the ZK medium pressure absorber absorbing it, lower pressure stage 59b omitted. From the HK / ZK low-pressure absorber 7a becomes poor ZK solution 20 via the second ZK solution pump 51 directly to the now only ZK medium-pressure absorber 22 guided.

In the 3 becomes the representation of 2 modified: By the ZK-Hochdruckaustreiber 39a is designed so that heat from an external heat source 5 and rich ZK solution 24 be conducted in DC. The rich ZK solution 24 gets into the cold part of the ZK high-pressure exhauster from below 39a initiated, the poor ZK solution 20 taken from the hot part. The circulating amounts of HK and ZK cycle are designed so that the temperature difference between the heat source and the respective solution at the end of the expulsion are the same or almost the same, so that from the HK-stilldruckaustreiber 1 or ZK-Hochdruckaustreiber 39a expelled vapors each have the same or nearly equal proportion of working fluid and the same or nearly the same temperature level.

HK- 17 and ZK high pressure steam 62 become a HK / ZK medium pressure expansion machine together 31a directed. In this, they are under mechanical work in a HK / ZK medium pressure wet steam 139 relaxed. The mechanical work is done by means of a generator 32 converted into electricity. From the HK / ZK medium-pressure expansion machine 31a becomes the HK / ZK medium pressure wet steam 139 to a medium pressure rectifier 2a passed and introduced in the hot part. These are countercurrent to the cold part of the medium pressure rectifier 2a introduced rich ZKM solution of the upper pressure stage 20c by mass and heat exchange in a HK / ZK medium pressure steam of the upper pressure stage 141 converted with higher working medium content, with the introduced from the rich ZKM solution of the upper pressure stage 20c also medium-pressure steam of the upper pressure stage is driven off as saturated steam. This additional amount is reduced to low pressure with the HK medium pressure steam of the upper pressure stage in the HK / ZK low pressure expansion machine 31b , The increase in the proportion of working fluid in the HK / ZK medium-pressure steam of the upper pressure stage 141 compared to the initiated HK / ZK medium pressure wet steam 139 can by the amount of rich ZKM solution 20c the upper pressure level to be controlled. In most applications, a single replacement tray will be in the medium pressure rectifier 2a suffice.

The rich ZKM solution of the upper pressure stage 20c is part of a solution circulation between medium-pressure rectifier referred to below as the additive pressure circuit (ZKM) 2a and HK / ZK low pressure absorber 7a ,

The in the medium pressure rectifier 2a initiated rich ZKM solution of the upper pressure stage 20c comes with the poor ZK solution 20 from the HK / ZK low-pressure absorber 7a taken and together as 20b by means of ZK / ZKM solution pump 51c to the pressure level of the medium pressure rectifier 2a brought, by means of valve 146 detached and in the HK / ZK solution heat exchanger of the lower temperature range 66 warmed up.

The from the medium pressure rectifier 2a Expiring poor HK / ZK / ZKM solution of the upper pressure stage 73c is mainly attributable to the additive pressure circuit, to a small extent, the main circuit and the additional circuit. This poor HK / ZK / ZKM upper compression solution 73c comes with the already on medium pressure brought poor HK solution 014 united. The combined solutions are used to dissipate heat through the solution heat exchanger of the lower temperature range 66 directed, by means of HK / ZKM throttle 74a brought to low pressure and the HK / ZK low-pressure absorber 7a for absorption.

The in the medium pressure rectifier 2a generated HK / ZK medium pressure steam of the upper pressure stage 141 is by means of valve 144 divided: ZK medium-pressure steam 71 becomes the ZK medium-pressure absorber 22 for absorption. The HK medium pressure steam 143 becomes a HK low pressure expansion machine 31b fed and relaxed in this under release of mechanical work to low pressure. The generated mechanical work is done by generator 32 turned into electricity. The relaxed HK / ZK low-pressure steam 147a becomes the HK / ZK low-pressure absorber 7a fed and absorbed there.

In the 4 will be in the 3 illustrated medium pressure rectifier 2a around a ZKM medium pressure actuator of the upper pressure stage 70c extended. The amount of rich to be introduced ZKM solution of the upper pressure stage 20c is opposite to the representation of 3 elevated. From the expiry of the medium pressure rectifier 2a is due to heat from an external heat source 5 additionally expelled steam, reducing the amount of ZK medium-pressure steam 71 is increased. This additional amount is reduced to low pressure with the HK medium pressure steam of the upper pressure stage in the HK / ZK low pressure expansion machine 31c , The temperature level of the heat supplied from an external heat source 5 to the ZKM medium pressure actuator of the upper pressure stage 70c becomes lower than that of the ZK high-pressure driver 39a established.

The already in the 1 illustrated addition of a ZKM subcircuit between a ZK Mitteldruckaustreiber 70 and a ZKM medium pressure absorber of the lower pressure stage 59b is possible with minor changes. The pressure level of the ZKM mid-pressure actuator of the lower pressure stage 70b is in the 4 lower than that of the ZKM mid-pressure actuator of the upper pressure stage 70c set. In most applications, its pressure level is relatively high, so that for the ZKM medium pressure actuator of the lower pressure stage 70b an assignment to a ZKM medium-pressure absorber of the lower pressure level 59b makes sense. Therefore, this is the ZKM medium-pressure steam of the lower pressure stage 71b from the ZKM medium pressure actuator of the lower pressure stage 70b for absorption. The ZKM medium pressure actuator of the lower pressure stage 70b becomes the expulsion-rich ZKM solution of the lower pressure stage 20b supplied as a second partial stream of the additive pressure circuit (ZKM). This is after the solution heat exchanger of the lower temperature range 66 from the rich ZKM solution of the upper pressure stage 20c by means of valve 149 separated. Both partial streams are previously by means of first ZK / ZKM solution pump 51b been brought to medium pressure of the lower pressure stage, the first partial flow rich ZKM solution 20c is then using ZKM solution pump 140 brought to medium pressure of the upper pressure level. Those from the ZKM medium pressure actuator of the lower pressure stage 70b draining poor ZKM solution of the lower pressure stage 73b is returned to the heat through this and using ZKM throttle 126 brought to low pressure and with the poor HK solution 014 as well as the poor HK / ZK / ZKM solution of the upper pressure stage 73b the HK / ZK low-pressure absorber 7a fed.

Analogously to the description in the parent application replaces the supply of ZKM medium pressure steam of the upper pressure stage 71b to the ZKM medium-pressure absorber of the lower pressure stage 59b at least partially the supply of ZK medium-pressure steam 71 , A correspondingly larger amount of the low pressure relaxation machine 31b be supplied. The recoverable work of the entire plant increases.

The HK / ZK medium-pressure steam 143a is in front of the low pressure expansion machine 31b in a medium pressure superheater 30a overheated. For this purpose, a partial flow of heat from external heat source 92 guided by this. He is using the main stream of heat from external heat source 92 before the ZKM medium pressure actuator of the upper pressure stage 70c united.

In the 5 is the HK high pressure driver 1a also on the parallel flow of heat from an external heat source 5 and rich HK solution 015 as well as poor CC solution 20 Designed: For parallel flow, the rich HK solution 015 and the poor CC solution 20 in the lower cold part of the HK high pressure actuator 1a initiated. The ZK high-pressure steam 62 is provided by the ZK high-pressure expeller 39a the HK-Hochdruckaustreiber 1a fed and introduced in the cold part. By mass and heat exchange in the floors of the HK high pressure exhauster 1a becomes the ZK high-pressure steam 62 Regarding working fluid content and temperature level equalized the HK high pressure steam and so high pressure vapors 017 both circuits of the expansion machine 31a fed.

A double heat supply in the main circuit is already in the 13 the parent application, but there superimposed with a Resorberkreislauf while in the 5 this application is a superposition with the HK / ZK medium pressure / low pressure circuit is shown. The poor HK solution 14 gets out of the hot part of the HK high pressure exhauster 1a removed and returned to the heat through it. Subsequently, she will talk about the solution heat exchangers 19a . 65 . 66 passed and to medium pressure of the lower pressure stage by means of second HK / ZK throttle 122b lowered and in the HK-Mitteldruckautustreiber the lower pressure level 70a initiated. Also, as a partial flow enriched HK solution 97 the HK-Mitteldruckaustreiber the lower pressure stage supplied after he previously by the HK / ZK low-pressure absorber 7a has been recycled for heat absorption.

The separation of the liquid from the HK / ZK medium pressure wet steam 139 takes place in a separator 138 instead of. A supply of rich ZKM solution is eliminated. The separated HK / ZK solution of the upper pressure stage 73d is used for heat dissipation through the solution heat exchanger of the lower temperature range 66 directed, by means of third HK / ZK throttle 150 brought to low pressure and the HK / ZK low-pressure absorber 7a fed. To an admission of Niederdruckentspannungsmaschine 31b Avoiding drops is a superheater 30b intended. This will heat below the temperature level of the ZK high pressure expeller 39a supplied from the external heat source.

The pressure level of the HK medium pressure actuator of the lower pressure stage 70a becomes lower than that of the withdrawal pressure from the medium-pressure expansion machine 31a set. By supplied heat from an external heat source 5 from the lowest temperature range, the HK medium pressure actuator becomes the lower pressure stage 70a HK medium pressure steam of the lower pressure stage 71a expelled. This is in the HK medium-pressure absorber of the lower pressure stage 59a which is at almost the same pressure as the HK medium pressure actuator of the lower pressure stage 70a stands. Those from the HK medium pressure actuator of the lower pressure stage 70a running poorest HK solution of the lower pressure level 73a is by means of second HK throttle 110 brought to low pressure and the HK / ZK low-pressure absorber 7a for absorption.

From the HK / ZK low-pressure absorber 7a runs a main stream enriched HK / ZK solution 148 off and is by means of second HK / ZK solution pump 51a to the pressure level of the HK medium pressure actuator of the lower pressure stage 70a raised. Thereafter, by means of valve 146 the partial flow of enriched HK solution 97 separated. The remaining residual stream of enriched HK / ZK solution 153 becomes the HK medium-pressure absorber of the lower pressure stage 59a for absorption.

From the HK medium-pressure absorber of the lower pressure stage 59a becomes a rich HK solution 015 removed, by means of second HK solution pump 96a over the way HK / ZK solution heat exchanger 66 . 65 and HK solution heat exchangers 19a in the HK-Hochdruckaustreiber 1a initiated. On the other hand, poor ZK solution 20 taken from the additional circuit and supported by the third ZK solution pump 60 the ZK medium-pressure absorber 22 for absorption.

In the 6 is the working method exemplified by means of a Tx diagram. The thermodynamic cycle takes place between three pressure levels. The temperature level of the two-component mixture increases with increasing proportion of working medium, wherein that for steam at equal proportions of working fluid and solvent is higher than that of the solution. The steam curve is marked with the symbol ", the solution curve with the symbol ❒.

When a process step, two circuits are formed, which as another Process step have different work equipment shares namely, a main circuit between x = 0.4 and x = 0.2 as well between the pressures po and pu and an additional cycle between x = 0.75 and x = 0.4 as well as between the pressures formed po and pm. With this determination is also a different one Solution circulation given.

Both cycles becomes heat at the pressure level supplied from an external heat source, wherein As a further feature of the process is a higher temperature level in the main circuit as in the additional cycle results. Another feature of the process is the approximation of the proportions of sorbent and solvent in the high vapors the main circuit and the additional circuit with the following result shown: A vapor is generated, which is in equilibrium with the rich HK solution and the poor ZK solution (both x = 0.4) stands. To achieve this, here is a counterflow in the HK high-pressure compressor and a parallel flow guide in the ZK high-pressure compressor each between solution and heat from an external heat source assumed. The equilibrium provides a steam with about 95% working fluid represents.

When Another process step is the vapor of both cycles of Pressure level po relaxed to pm. Since po is a saturated steam, the relaxation ends in the wet steam area.

When further process step, the CC vapor is separated and the ZK medium-pressure absorber the additional circuit at the pressure level pm for absorption, wherein the ZK medium pressure steam from the poor ZK solution at pressure level pm to form the rich ZK solution is recorded.

from HK medium-pressure steam, the moisture content is separated, wherein the proportion of working fluid in the steam increases (approximately to x = 0.97). This HK medium pressure steam is relaxed from the pressure level pm to the pressure level pu. The HK low pressure steam is fed to the absorption level pu for absorption, wherein the HK low-pressure steam from the poor HK solution at pressure level pu to form the rich HK solution is added. Of the Process step, the pressure level of the absorption in the additional cycle higher than in the main circuit, it allows an approximately same or the same lowest temperature both in the ZK medium-pressure absorber as well as in the HK low-pressure absorber.

Of the described thermodynamic cycle allows a heat source with constantly falling temperature differentiated according to the different Exergy to use and not only by means of superheated high-pressure steam - as it is shown in the parent application -, but also by means of high-pressure saturated steam.

Of the fundamental Advantage of the method the prior art, at least for a portion of the heat a considerably larger pressure difference to use in the relaxation of the expelled steam, is for use extended by saturated steam. On the basis of the available literature in the dual-substance mixture ammonia and water particularly profitable Conditions for the relaxation of saturated steam given, if given proportion of the working fluid at falling pressure and falling temperature the enthalpy of the saturated steam remains the same or only slightly decreases. In the circuits described can be in each of the two expansion machines such areas are used. However, the area is included low pressures narrower. Therefore, the variant with an overheating of the medium-pressure steam and relaxation of a very overheating Medium pressure steam in particular for the utilization of a heat source attractive with high maximum temperature.

The in the high-pressure expulsion, high heat to be supplied to the high pressure steam due to the higher water content amount of steam produced can when using a Mitteldruckrektifikators in Substantially recovered for the production of medium pressure steam become.

Since no rectification is required at high pressure level, a larger proportion of the heat source in the main circuit and thus can be used with higher work. In the same direction, the higher solvent content in the ZK high-pressure steam has an effect: the solution circulation decreases. If the medium pressure absorber steam is supplied from a medium pressure compressor - as in the 4 and 5 shown, so relatively reduces the amount of steam to be supplied. It can be fed to a larger amount of steam low pressure relaxation machine.

at lower maximum temperatures of the heat source is the arrangement of the HK high-pressure compressor in parallel guidance of heat source and rich HK solution suitable, at higher Maximum temperatures, the countercurrent flow suitable. In the binary pair Ammonia and water, the separation temperature is 150 ° C. Above This temperature is a steep increase in the efficiency of Overall system up to a maximum heat source temperature of approx. To achieve 50 K above the decomposition temperature of the working fluid by in the main circuit the solution amount is enlarged.

1

HK Hochdruckaustreiber

1a

HK Hochdruckaustreiber with parallel flow guidance

2a

Mitteldruckrektifikator

5

external heat source

7a

HK / ZK-low pressure absorption

8a

first HK / ZK solution pump

13

Solution recycling by cast out

14

poor HK solution

15

rich HK solution

015

decreased Amount of rich HK solution

0015

main power rich HK solution

16

HK-stripping column

17

rectified HK-work means high pressure steam

017

rectified Working medium high-pressure steam of both circuits

18

HK low pressure steam

018

Low pressure steam both circuits top

19a

HK-solution heat exchanger the temperature range

20

poor ZK solution

20a

rich HK solution the lower pressure level

20b

rich ZKM solution the lower pressure level

20c

rich ZKM solution the upper pressure level

20d

rich HK / ZK solution the lower pressure level

22

ZK-medium pressure absorber

23

first ZK-solution pump

24

rich ZK solution

26

first ZK-stripping column

27

second ZK-stripping column

028

overheated Working medium vapor

30

Steam superheater

30a

Medium pressure steam superheater

31

expansion machine

31a

Medium pressure expansion machine

31b

Low-pressure expansion machine

32

generator

33

Chillers

39

ZK-Hochdruckaustreiber

39a

ZK-Hochdruckaustreiber with parallel flow guidance

42

Solution recycling by HK absorber

43

Solution recycling by ZK absorber of the lower pressure stage

44

second Partial stream rich ZK solution

51

second ZK-solution pump

51a

second HK / ZK solution pump

51b

first ZK / ZKM solution pump

51c

second ZK / ZKM solution pump

51d

HK / ZK / ZKM solution pump

52

Valve

53

first Partial stream of the rich CC solution

59

second ZK medium-pressure absorber of the lower pressure stage

59a

HK / ZK medium pressure absorber the lower pressure level

59b

ZKM medium pressure absorber the lower pressure level

60

third ZK-solution pump

61

enriched ZK solution

62

HK-work means high pressure steam

63

ZK-medium pressure steam the lower pressure level

64

Brine

65

HK / ZK solution heat exchanger the middle temperature range

66

HK / ZK-solution heat exchanger of the lower temperature range

67

Valve

68

third DC reactor

69

rich ZK solution of the medium / low pressure auxiliary circuit

70

ZK-Mitteldruckaustreiber

70a

HK Mitteldruckaustreiber the lower pressure level

70b

ZKM Mitteldruckaustreiber the lower pressure level

70c

ZKM Medium pressure actuator of the upper pressure stage

71

ZK-medium pressure steam

71a

HK-medium pressure steam the lower pressure level

71b

ZKM medium pressure steam the lower pressure level

72

third HK-throttle

73

poor ZK solution

73a

poorest HK solution the lower pressure level

73b

poor ZKM solution the lower pressure level

73c

HK / ZK / ZKM solution of upper pressure level

73d

HK / ZK solution of upper pressure level

74

first HK / DC reactor

74a

HK / ZKM throttle

89

main power of heat from the external heat source

92

partial flow of heat from the external heat source

96a

second HK-solution pump

97

partial flow enriched ZK solution

110

fourth HK-throttle

122b

second HK / DC reactor

126

ZKM throttle

130

fourth ZK-stripping column

138

separator

139

HK / ZK medium pressure wet steam

140

ZKM solution pump

141

HK / ZK medium pressure steam

143

HK-medium pressure steam

143a

HK / ZK medium pressure steam

144

Valve

146

Valve

147

HK Low pressure steam

148

main power enriched HK / ZK solution

149

Valve

150

fourth HK / ZKM throttle

153

Leakage current Enriched HK / ZK solution

Claims (6)

Working method of a sorption plant for a binary mixture of working medium and sorbent according to patent DE 10 2005 005 409.9 essentially comprising: a main circuit high pressure expeller ( 1 ) for the expulsion of a mixed vapor of working medium and sorbent ( 17a ) with a high proportion of working medium from a rich main circulation solution ( 15 ), • work-performing expansion machines ( 31a , b) for the expansion of the mixed steam of working medium and sorbent ( 17a ) with a high proportion of working fluid and a main circuit with • a main circuit low-pressure absorber ( 7 ) for the absorption of HK low pressure steam ( 18 ), • a main circulation solution heat exchanger ( 19 ) for heat exchange between poor main circulation solution ( 14 ) and rich main circulation solution ( 15 ), characterized in that an additional circuit with the same two-component pair is added to a main circuit, and the following method steps are included: (a) proportion of working fluid and circulating volume in the solutions ( 14 . 15 ) of the main circuit or in the solutions ( 20 . 24 ) of the auxiliary circuit are set differently from each other, (b) heat from an external heat source ( 5 ) is passed to the steam expulsion first through the main circuit and then through the additional circuit, (c) that the ZK-Hochdruckaustreiber ( 39a ) and the HK high pressure actuator ( 1 ) to the same pressure (d) the proportions of sorbent and solvent of the high vapors of the main circuit and the auxiliary circuit are adjusted, (e) the high-pressure vapors of the main circuit and that of the auxiliary circuit are expanded together to generate mechanical energy, (f) the pressure level of absorption becomes set in the auxiliary circuit higher than in the main circuit, the additional circuit ( 39a . 20 . 22 . 24 ) has the following features: (g1) a ZK high pressure exporter ( 39a ) with parallel guidance of the heat flow and the ZK solution, (g2) the HK high-pressure steam ( 17 ) and the ZK high-pressure steam ( 62a ) are used to form a first medium-pressure expansion machine operated between the main and auxiliary circuits between high pressure and medium pressure ( 31a ), (h) that a ZK medium-pressure absorber ( 22 ) for the absorption of the ZK medium-pressure steam ( 71 ), (i) that a first ZK solution pump ( 23 ) to increase the pressure of the rich ZK solution ( 24 ) to the pressure level of the ZK high-pressure compressor ( 39a ), (j) where for the rich ZK solution ( 24 ) of the auxiliary circuit a higher proportion of the working fluid than for that of the rich HK solution ( 15 ) (k) wherein a feed of the rich ZK solution ( 24 ) from the auxiliary circuit into the cold part of the ZK high-pressure compressor ( 39a ), (l1) the poor ZK solution ( 20 ) of the additional circuit from the hot part of the ZK high-pressure compressor ( 39a ) and in the HK-Hochdruckaustreiber ( 1 ), (l2) the mass flows of poor CC solution ( 20 ) of the additional circuit and rich HK solution ( 15 ) from the drain of the HK low-pressure absorber ( 7 ) or after the HK / ZK low-pressure absorber ( 7a ), (l3) being those of the HK / ZK low-pressure absorber ( 7a ) to the HK high-pressure driver ( 1 ) to be passed rich HK solution ( 015 ) is the difference of the rich HK solution required for the expulsion ( 15 ) minus the poor ZK solution ( 20 ) of the first additional cycle, (m1) the ZK medium-pressure steam ( 71 ) from HK / ZK medium pressure steam ( 141 ) and the ZK medium-pressure absorber ( 22 ), (n1) the poor ZK solution ( 20 ) of the additional circuit of the HK / ZK low-pressure absorber ( 7a ) to the ZK medium-pressure absorber ( 22 ) for the absorption of the ZK medium-pressure steam of the upper pressure stage ( 71 ) supported by the second ZK solution pump ( 51 ), (o) the rich ZK solution ( 24 ) of the auxiliary circuit supported by the first ZK solution pump ( 23 ) via the way the solution heat exchanger of the lower ( 65 ) and the middle temperature range ( 66 ) to the ZK high pressure exporter ( 39a ), (p) the poor HK solution ( 14 ) for heat release by the HK-Hochdruckaustreiber ( 1 ) ( 13 ) and the rich HK solution ( 15 ) for heat absorption by the HK low-pressure absorber ( 7 ) ( 42 ), (q) where the pressure difference between HK high pressure expander ( 1 ) and ZK medium-pressure absorbers ( 22 ) smaller than between HK-Hochdruckaustreiber ( 1 ) and HK / ZK low pressure absorbers ( 7a ), (r1) in the upper temperature range, a HK solution heat exchanger ( 19a ), (r2) where the poor HK solution ( 14 ) first through the HK solution heat exchanger of the upper temperature range ( 19a ) and in countercurrent to the rich HK solution ( 015 ), (r3) and a HK / ZK solution heat exchanger for the middle ( 65 ) and a HK / ZK solution heat exchanger for the lower temperature range ( 66 ), (r4) wherein the poor HK solution ( 014 ) through the HK / ZK solution heat exchanger for the medium temperature range ( 65 ) and countercurrent to the rich HK solution ( 015 ) and the rich ZK solution ( 24 ) of the auxiliary circuit, (r5) and the poor HK solution ( 014 ) combined with the HK / ZK solution ( 73d ) through the HK / ZK solution heat exchanger for the lower temperature range ( 66 ) and countercurrent to the rich HK solution ( 015 ), (s1) and the HK / ZK medium pressure wet steam ( 139 ) by liquid separation in HK / ZK solution of the upper pressure range ( 73d ) and HK / ZK medium pressure steam (141), (s2) the HK / ZK solution ( 73d ) between the solution heat exchangers of the middle ( 65 ) and lower temperature range ( 66 ) with the poor HK solution ( 014 ), (s3) the poor HK solution ( 14 ) with a first HK throttle ( 72 ) to the pressure level the final pressure of the medium-pressure expansion machine ( 31a ) and then combined with the HK / ZK solution ( 73d ) with a first HK / ZK throttle ( 74 ) is lowered to low pressure and the HK / ZK low-pressure absorber ( 7a ) is fed to the absorption, (t1) the relaxation of the HK medium-pressure steam ( 143 ) from medium pressure to low pressure with release of mechanical energy in a low-pressure expansion machine ( 31b ), (t2) the relaxed HK low pressure steam ( 147 ) the HK low-pressure absorber ( 7 ) is fed to the absorption. Working method of a sorption plant for a binary mixture of working medium and sorbent according to patent DE 10 2005 005 409.9 essentially comprising: a main circuit high pressure expeller ( 1 ) for the expulsion of a mixed vapor of working medium and sorbent ( 17a ) with high work equipment part of a rich main circulation solution ( 15 ), • work-performing expansion machines ( 31a , b) for the expansion of the mixed steam of working medium and sorbent ( 17a ) with a high proportion of working fluid and a main circuit with • a main circuit low-pressure absorber ( 7 ) for the absorption of HK low pressure steam ( 18 ), • a main circulation solution heat exchanger ( 19 ) for heat exchange between poor main circulation solution ( 14 ) and rich main circulation solution ( 15 ), characterized in that an additional circuit with the same two-component pair is added to a main circuit, and the following method steps are included: (a) proportion of working fluid and circulating volume in the solutions ( 14 . 15 ) of the main circuit or in the solutions ( 20 . 24 ) of the auxiliary circuit are set differently from each other, (b) heat from an external heat source ( 5 ) is passed to the steam expulsion first through the main circuit and then through the additional circuit, (c) that the ZK-Hochdruckaustreiber ( 39a ) and the HK high pressure actuator ( 1 (d) the proportions of sorbent and solvent of the high vapors of the main circuit and the auxiliary circuit are adjusted, (e) the high pressure vapors of the main circuit and that of the auxiliary circuit are expanded together to generate mechanical energy; The pressure level of the absorption is set higher in the additional cycle than in the main cycle, whereby the additional cycle ( 39a . 20 . 22 . 24 ) has the following features: (g1) a ZK high pressure exporter ( 39a ) with parallel guidance of the heat flow and the ZK solution, (g2) the HK high-pressure steam ( 17 ) and the ZK high-pressure steam ( 62a ) are used to form a first medium-pressure expansion machine operated between the main and auxiliary circuits between high pressure and medium pressure ( 31a ), (g3) the ZK high pressure steam ( 62 ) from the ZK high pressure compressor ( 39a ) to the HK high-pressure driver ( 1a ) and introduced into its cold part, (h) a ZK medium-pressure absorber ( 22 ) for the absorption of the ZK medium-pressure steam ( 71b ), (i) that a first ZK solution pump ( 23 ) to increase the pressure of the rich ZK solution ( 24 ) to the pressure level of the ZK high-pressure compressor ( 39a ), (j) where for the rich ZK solution ( 24 ) of the auxiliary circuit a higher proportion of the working fluid than for the rich HK solution ( 15 ) (k) an injection of the rich CC solution ( 24 ) from the auxiliary circuit into the cold part of the first ZK high-pressure compressor ( 39a ), (l1) the poor ZK solution ( 20 ) of the auxiliary circuit from the hot part of the first ZK high-pressure compressor ( 39a ) and in the HK-Hochdruckaustreiber ( 1 ), (l4) the mass flows of rich ZKM solution of the upper pressure stage ( 20c ) of the first auxiliary circuit medium pressure circuit and the poor HK solution ( 14 ) after the solution heat exchanger of the upper temperature range ( 19a ), which are separated by the solution heat exchangers of the middle and lower temperature ranges ( 65 . 66 ) to the HK medium pressure actuator of the lower pressure stage ( 70a ) to be passed to poor HK solution ( 014 ) as the difference quantity from the HK high pressure expeller ( 1a ) running poor HK solution ( 14 ) minus the rich ZKM solution of the upper pressure stage ( 20c ) of the additive pressure cycle, (m2) the ZKM medium-pressure vapor of the lower pressure stage ( 71b ) from HK / ZK medium pressure steam ( 141 ) and the ZK medium-pressure absorber ( 22 ), (n2) the poor ZK solution ( 20 ) of the additional circuit of the HK medium-pressure absorber of the lower pressure stage ( 59a ) to the ZK medium-pressure absorber ( 22 ) for the absorption of the ZK medium-pressure steam ( 71 ) supported by the third ZK solution pump ( 60 ), (o) the rich ZK solution ( 24 ) of the auxiliary circuit supported by the first ZK solution pump ( 23 ) via the way the solution heat exchanger of the lower ( 65 ) and middle temperature range ( 66 ) to the ZK high pressure exporter ( 39a ), (p) the poor HK solution ( 14 ) for heat release by the HK-Hochdruckaustreiber ( 1 ) ( 13 ) and the rich HK solution ( 15 ) for heat absorption by the HK low-pressure absorber ( 7 ) ( 42 ), (q) where the pressure difference between HK high pressure expander ( 1 ) and ZK medium-pressure absorbers ( 22 ) smaller than between HK-Hochdruckaustreiber ( 1 ) and HK / ZK low pressure absorbers ( 7a ), (r1) in the upper temperature range, a HK solution heat exchanger ( 19a ), (r2) where the poor HK solution ( 14 ) first through the HK solution heat exchanger of the upper temperature range ( 19a ) and in countercurrent to the rich HK solution ( 015 ), (r3) and a HK / ZK solution heat exchanger for the middle ( 65 ) and a HK / ZK solution heat exchanger for the lower temperature range ( 66 ), (r4) wherein the poor HK solution ( 014 ) through the HK / ZK solution heat exchanger for the medium temperature range ( 65 ) and countercurrent to the rich HK solution ( 015 ) and the rich ZK solution ( 24 ) of the additional circuit, (r6) and the poor HK solution ( 014 ) and the poor HK / ZK solution of the upper pressure stage ( 73d ) through the HK / ZK solution heat exchanger for the lower temperature range ( 66 ) and countercurrent to the rich HK solution ( 015 ) and the rich ZK solution ( 24 ) are cooled, (s1) and the HK / ZK medium-pressure wet steam ( 139 ) by liquid separation in HK / ZK solution of the upper pressure range ( 73d ) and HK / ZK medium pressure steam ( 141 ), (t1) the relaxation of the HK medium-pressure steam ( 143 ) from medium pressure to low pressure with release of mechanical energy in a low-pressure expansion machine ( 31b ), (t2) the relaxed HK low pressure steam ( 147 ) the HK low-pressure absorber ( 7 ) is fed to the absorption, wherein the main circuit has the following special features: • a HK-Hochdruckau driver ( 1a ) with parallel guidance of the heat flow and ZK solution, • the rich HK solution ( 015 ) into the cold part of the HK high-pressure compressor ( 1a ) and • the poor HK solution ( 14 ) from the hot part of the HK high pressure exhauster ( 1a ), • a HK medium pressure actuator of the lower pressure stage, a second HK throttle ( 110 ), a HK / ZKM throttle ( 74a ) and a third HK / ZK throttle ( 150 ) for this HK medium pressure actuator of the lower pressure stage ( 70a ) lower pressure than for the ZK high pressure expeller ( 39a ) or for a medium-pressure rectifier inserted in the main circuit ( 2a ), • heat from an external heat source ( 5 ) after passing through the ZK high pressure expeller ( 39a ) or by the ZKM medium pressure actuator of the upper pressure stage ( 70c ) the HK medium pressure actuator of the lower pressure stage ( 70a ), • the HK medium-pressure steam of the lower pressure stage ( 71a ) from the HK medium pressure actuator of the lower pressure stage ( 70a ) to the lower pressure HK medium pressure absorber under the same pressure ( 59a ), • a substream of enriched HK solution ( 97 ) from the HK / ZK low-pressure absorber ( 7a ) to the HK medium pressure actuator of the lower pressure stage ( 70a ), wherein the partial flow of enriched HK solution ( 97 ) is returned by one of the absorbers for heat absorption, and in the HK medium-pressure compressor of the lower pressure stage ( 70a ), a main stream of enriched HK / ZK solution ( 148 ) from the HK / ZK low-pressure absorber ( 7a ) to the pressure level of the HK medium pressure actuator of the lower pressure stage ( 70a ) by means of HK / ZK solution pump ( 51a ), • the partial flow of enriched HK solution ( 97 ) from the main stream of enriched HK / ZK solution ( 148 ) after the HK / ZK solution pump ( 51a ), the residual current of enriched HK / ZK solution ( 153 ) to the HK medium pressure absorber of the lower pressure stage ( 59a ) is fed to the absorption, • the poor HK solution ( 014 ) with the second HK throttle ( 122b ) to the pressure level of the HK medium pressure actuator of the lower pressure stage ( 70a ) is throttled, • the poor HK solution ( 014 ) the HK medium pressure actuator of the lower pressure stage ( 70a ) from the HK medium pressure actuator of the lower pressure stage ( 70a ) running poorest HK solution of the lower pressure stage ( 73a ) is by means of second HK throttle ( 110 ) and this poorest HK solution ( 73a ) to the HK / ZK low-pressure absorber ( 7a ) is passed to the absorption. Working method according to claim 1 or 2, characterized in that an additive medium pressure circuit (ZKM) is inserted with the following features: (r7) the poor HK solution ( 014 ) through the HK / ZK solution heat exchanger for the lower temperature range ( 66 ) and countercurrent to the rich HK solution ( 015 ) and in addition the rich ZKM solution of the upper pressure stage ( 20c ) of the additive pressure circuit and the poor HK / ZK / ZKM solution of the upper pressure stage ( 73c ), (u1) a medium pressure rectifier ( 2a ) and the HK / ZK medium pressure wet steam ( 139 ) in a medium pressure rectifier ( 2a ), wherein the HK / ZK medium pressure wet steam ( 139 ) in the medium pressure rectifier ( 2a ) by heat exchange and mass exchange with the rich ZKM solution of the upper pressure stage ( 20c ) of the additive pressure circuit into a HK / ZK medium-pressure steam ( 141 ) and HK solution is transformed, (u2) HK / ZKM / ZKM solution of the upper pressure stage ( 73c ) from the cold part of the medium pressure rectifier ( 2a ) and between the solution heat exchangers of the middle ( 65 ) and lower temperature range ( 66 ) with the poor HK solution ( 014 ) is (u3) different from the mode of operation of a single circuit in which working fluid is supplied and evaporated, now at least from the rich ZKM solution of the upper pressure stage ( 20c ) of the additive medium pressure circuit ZKM medium pressure steam is expelled and the ZKM solution is heated, (v) and a second ZK / ZKM solution pump ( 51c ) to increase the rich ZKM solution of the upper pressure stage ( 20c ) to the pressure level of the medium pressure rectifier ( 2a ), (w) wherein for the rich ZKM solution of the upper pressure stage ( 20c ) of the additive pressure circuit the same proportion of the working fluid as that for the rich HK solution ( 15 ) (x) the rich ZKM solution of the upper pressure stage ( 20c ) of the additive pressure circuit supported by the second ZK / ZKM solution pump ( 51c ) from the HK / ZK low pressure absorber ( 7a ) to the medium pressure rectifier ( 2a ), (y) and the poor HK solution ( 14 ) with the third HK throttle ( 72 ) to the pressure level of the medium pressure rectifier ( 2a ) and then united with the poor HK / ZK / ZKM solution ( 73c ) of the upper pressure stage with a HK / ZKM throttle ( 74a ) is lowered to low pressure. Working method according to one of the preceding claims, characterized in that (z1) in the additive medium pressure circuit (ZKM) a ZKM medium pressure actuator of the upper pressure stage ( 70c ) at the pressure level of the medium pressure rectifier ( 2a ), (z2) heat from an external heat source ( 5 ) after passing through the ZK high pressure expeller ( 39a ) to the ZKM medium pressure actuator of the upper pressure stage ( 70c ), (z3) wherein from the course of the medium-pressure rectifier ( 2a ) by heat supply ZK medium-pressure steam ( 71 ) is expelled and (z4) this medium-pressure level expelled ZK medium-pressure steam ( 71 ) together ( 143a ) with the HK medium pressure steam ( 143 ) with delivery of mechanical work via the low-pressure expansion machine ( 31b ) the HK / ZK low-pressure absorber ( 7a ) is fed to the absorption, (z5) the HK / ZK / ZKM solution of the upper pressure range ( 73c ) from the cold part of the ZKM medium pressure actuator of the upper pressure stage ( 70c ) and between the solution heat exchangers of the middle ( 65 ) and lower temperature range ( 66 ) with the poor HK solution ( 014 ) is united. Working method according to one of claims 1 and 3 to 4, characterized in that (za1) in the additive medium pressure circuit (ZKM) a ZKM medium pressure actuator of the lower pressure stage ( 70b ), a ZKM throttle ( 126 ) and a ZKM medium pressure absorber of the lower pressure stage ( 59b (za2) for this ZKM medium pressure actuator of the lower pressure stage ( 70b ) lower pressure than for the ZK high pressure expeller ( 39a ) or for the medium pressure rectifier ( 2a ) or for the ZKM medium pressure actuator of the upper pressure stage ( 70c ) (za3) heat from an external heat source ( 5 ) after passing through the ZK high pressure expeller ( 39a ) or by the ZKM medium pressure actuator of the upper pressure stage ( 70c ) the ZKM medium pressure actuator of the lower pressure stage ( 70b ), (za4) the ZKM medium-pressure steam of the lower pressure stage ( 71b ) from the ZKM medium pressure actuator of the lower pressure stage ( 70b ) to the lower pressure ZKM medium pressure absorber under the same pressure ( 59b ) (za5) a lot of ZK medium pressure steam ( 71 ), the amount of generated ZKM medium pressure steam ( 71b ), is put together ( 143a ) with the HK medium pressure steam ( 143 ) from medium pressure to low pressure with release of mechanical energy in a low pressure expansion machine ( 31b ), and the relaxed HK / ZK low pressure steam ( 147a ) the HK / ZK low-pressure absorber ( 7a ) is fed to the absorption, (za6) poor ZK solution and rich ZKM solution become common ( 20b ) after the HK / ZK low-pressure absorber ( 7a ) to the level of the ZKM medium-pressure absorber of the lower pressure stage ( 59b ) by means of the first ZK / ZKM solution pump ( 51b ) and this common solution in the ZKM medium-pressure absorber of the lower pressure stage ( 59b ) introduced for absorption, (za7) enriched ZK solution ( 61 ) of the first additional circuit to the ZK medium-pressure absorber ( 22 ) is passed to the absorption, (za8) the rich ZKM solution of the upper pressure stage ( 20c ) by means of ZKM solution pump ( 140 ) to the pressure level of the medium pressure rectifier ( 2a ) (za9) the rich ZKM solution of the upper pressure stage ( 20c ) from the ZKM medium-pressure absorber of the lower pressure stage ( 59b ) via the path of the HK / ZK solution heat exchanger for the lower temperature range ( 66 ) the ZKM medium pressure actuator of the lower pressure stage ( 70b ) is sent to the expulsion, (za10) the poor HK solution ( 014 ) with the second HK throttle ( 122b ) to the pressure level of the ZKM medium pressure actuator of the lower pressure stage ( 70b ) is throttled (za11) from the ZKM medium pressure actuator of the lower pressure stage ( 70b ) running low-pressure ZKM solution ( 73b ) by means of ZKM throttle ( 126 ) is brought to low pressure, (za12) and this poor ZKM solution of the lower pressure stage ( 73b ) to the HK / ZK low-pressure absorber ( 7a ) is fed to the absorption. Working method according to one of claims 1 and 3 to 5, characterized in that • a medium-pressure steam superheater ( 30b ) in the vapor stream of the main circuit, or the HK / ZK cycle before the low-pressure expansion machine ( 31b ), • the HK medium-pressure steam ( 143 ) or HK / ZK medium-pressure steam ( 143a ) in the medium-pressure steam superheater ( 30b ) and • the HK medium-pressure steam ( 143 ) or HK / ZK medium-pressure steam ( 143a ) via the medium-pressure steam superheater ( 30b ) to the low-pressure expansion machine ( 31b ).