CN104279013B - The ORC (organic Rankine cycle) low-temperature afterheat generating system of a kind of optimization - Google Patents
The ORC (organic Rankine cycle) low-temperature afterheat generating system of a kind of optimization Download PDFInfo
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Abstract
An ORC (organic Rankine cycle) low-temperature afterheat generating system for optimization, thermal source runner is contrary with the flow direction in cold source and course road; On the flow direction of thermal source runner, the heat source passages of first step ORC generating set ... N level ORC generating set is sequentially connected in series in same thermal source runner, or it is connected in parallel in same thermal source runner, or connects different thermal source runners respectively; On the flow direction in cold source and course road, the cold source channels of first step ORC generating set ... N level ORC generating set is oppositely sequentially connected in series in same cold source and course road, or it is connected in parallel in same cold source and course road, or connects different cold source and course roads respectively. The present invention can fully reclaim heat that thermal source carries or the cold that cold source is carried, the cycle efficiency of optimization system, thus increases overall generated energy, it is possible to reaches optimum cycle efficiency; System design is more flexible, it is to increase system is to the adaptive faculty of operating mode.
Description
Technical field
The present invention relates to cogeneration technology field, especially relate to the ORC (organic Rankine cycle) low-temperature afterheat generating system of a kind of optimization.
Background technology
The energy that industrial production consumption is a large amount of also produces used heat. For the higher residual heat resources of taste, due to reasons such as energy transformation ratio height, comprehensive benefit are good, obtain effective recycling. And the recovery to some lower residual heat resources of taste, then it is subject to many restrictions.
Generally speaking, if waste heat directly can be utilized by heat user, it is the most economical, easily, such as warm-up combustion-supporting air or combustion gas, preheating or dried material, production steam or hot water, etc. In a lot of occasion, neighbouring do not have enough heat user, and cogeneration just becomes a kind of effective way improving energy utilization rate. Wherein, due to features such as system are simple, generating efficiency is relatively high, organic Rankine bottoming cycle (ORC) becomes current and reclaims the hot spot technology of low temperature exhaust heat for generating electricity.
In addition, ORC system is also applied to the recovery generating of the useless cold (such as LNG cold) of industry, and its essence is still cogeneration.
The generating efficiency of ORC system is relevant to the vaporization temperature of working medium and condensing temperature. According to thermodynamic argument, higher working medium vaporization temperature and lower condensing temperature can improve the mechanical efficiency of circulation.
At present, for single source (with single cold source), the single ORC power generation system of design usually. The vaporization temperature that working medium can reach depends on inlet temperature and the temperature out of thermal source. For identical thermal source inlet temperature, higher thermal source outlet temperature can obtain higher working medium vaporization temperature, thus obtains higher mechanical efficiency.
In order to make full use of residual heat resources, always reduce thermal source outlet temperature as far as possible. But, if the temperature out of available heat sources is lower, by causing, the vaporization temperature of working medium is lower, and system will operate in lower cycle efficiency.
The output work of ORC system depends on two aspects: available heat and system efficiency. In order to increase available heat, it is necessary to reduce thermal source outlet temperature; In order to improve system efficiency, it is necessary to improve working medium vaporization temperature. For traditional single ORC system, the requirement of these two aspects can not get both to a certain extent.
The above-mentioned analysis to thermal source is equally applicable to cold source. If the temperature out in available cold source is higher, by causing, the condensing temperature of working medium is higher, and system will operate in lower cycle efficiency.
Summary of the invention
It is an object of the invention to design the ORC (organic Rankine cycle) low-temperature afterheat generating system of a kind of novel optimization, solve the problem.
In order to realize above-mentioned purpose, the technical solution used in the present invention is as follows:
An ORC (organic Rankine cycle) low-temperature afterheat generating system for optimization, comprises ladder pressure ORC generating set, thermal source and Leng Yuan, and the thermal source runner being connected with described cold source with described thermal source respectively and cold source and course road; Described ladder pressure ORC generating set comprises first step ORC generating set ... N level ORC generating set from big to small successively by its operating pressure, and wherein N is natural number, and N is more than or equal to 2; Every grade of described ORC generating set includes heat source passages and cold source channels;
Described thermal source runner is contrary with the flow direction in described cold source and course road;
On the flow direction of described thermal source runner, the heat source passages of the described N level ORC generating set of described first step ORC generating set ... is sequentially connected in series in same thermal source runner, or it is connected in parallel in same thermal source runner, or connects different thermal source runners respectively;
On the flow direction in described cold source and course road, the cold source channels of the described N level ORC generating set of described first step ORC generating set ... is oppositely sequentially connected in series in same cold source and course road, or it is connected in parallel in same cold source and course road, or connects different cold source and course roads respectively.
Preferably, described N equals 2, and described ladder pressure ORC generating set comprises high pressure ORC generating set and low pressure ORC generating set;
On the flow direction of described thermal source runner, the heat source passages of described high pressure ORC generating set and described low pressure ORC generating set is sequentially connected in series in same thermal source runner, or it is connected in parallel in same thermal source runner, or connects different thermal source runners respectively;
On the flow direction in described cold source and course road, the cold source channels of described high pressure ORC generating set and described low pressure ORC generating set is oppositely sequentially connected in series in same cold source and course road, or it is connected in parallel in same cold source and course road, or connects different cold source and course roads respectively.
Preferably, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
Preferably, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is connected in parallel in same cold source and course road.
Preferably, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is connected in parallel in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
Preferably, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels connects different cold source and course roads respectively.
Preferably, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels connects different thermal source runners respectively;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
Preferably, every grade of described ORC generating set includes preheater, vaporizer, regenerator, condenser, working medium pump, generator and power supply system, also comprise decompressor or turbine; Wherein, described preheater and described vaporizer form described heat source passages, and described condenser forms described cold source channels;
Described thermal source 101 flows through described vaporizer and described preheater successively, and described cold source 102 flows through condenser;
In described ORC generating set, described condenser is communicated to described regenerator by described working medium pump, then it is connected successively by described preheater and described vaporizer, then it is communicated to described decompressor or described turbine, and then return after described regenerator in described condenser;
Described decompressor or described turbine and described generator are in transmission connection, and described generator is electrically connected with described power supply system.
Preferably, the working medium circulation pressure in described ORC generating set at different levels is different; Reduce successively along the working medium vaporization temperature in the described ORC generating set of the flow direction arranged in series of described thermal source runner and evaporating pressure; Working medium condensing temperature and condensing pressure in the described ORC generating set of the flow direction arranged in series in described cold source and course road raise successively.
For traditional ORC system, increasing available heat or available cold and improve system efficiency and sometimes can not take into account simultaneously, this causes residual heat resources can not obtain farthest effectively transforming.
For the problems referred to above, in order to improve the changing effect of residual heat resources, patent of the present invention provides the ORC (organic Rankine cycle) low-temperature afterheat generating system of a kind of optimization. Wherein, by the temperature process of falling of single source or single cold source is carried out rational interval division, the Land use systems in design thermal source and cold source, and at least one item is for being arranged in series; Connect at thermal source flow direction or it is arranged in parallel two or more sets interchanger, to two or more sets ORC generating set heat supplies; Each ORC generating set is separate; Connect in cold source flow direction or it is arranged in parallel two or more sets interchanger, provide cold to two or more sets ORC generating set.
By this technological invention, while fully reclaiming heat from heat source or cold source cold, it is possible to effectively improve the overall efficiency of ORC circulation, thus increase the overall generated energy of system.
The useful effect of the present invention can be summarized as follows:
1, the present invention is used, it is possible to the heat that abundant recovery thermal source carries or the cold that cold source is carried.
2, use the present invention, it is possible to the cycle efficiency of optimization system, thus increase overall generated energy.
3, using the present invention, owing to heat source temperature or cold source temperature interval having been segmented, each generating set can adopt different working medium, and to reach the cycle efficiency of optimum, system design is more flexible. Pass through optimization design, it is possible to increase overall generated energy further.
4, the present invention is used, it is possible to improve system to the adaptive faculty of operating mode.
Accompanying drawing explanation
Fig. 1 is the system process figure of the embodiment of the present invention 1.
101-thermal source, the cold source of 102-, 103-preheater, 104-vaporizer, 105-decompressor, 106-regenerator, 107-condenser, 108-working medium pump, 109-generator, 110-powers, 103a-preheater, 104a-vaporizer, 105a-decompressor, 106a-regenerator, 107a-condenser, 108a-working medium pump, 109a-generator, 110a-powers.
Fig. 2 is the system process figure of the embodiment of the present invention 2.
201-thermal source, the cold source of 202-, 203-preheater, 204-vaporizer, 205-decompressor, 206-regenerator, 207-condenser, 208-working medium pump, 209-generator, 210-powers, 203a-preheater, 204a-vaporizer, 205a-decompressor, 206a-regenerator, 207a-condenser, 208a-working medium pump, 209a-generator, 210a-powers, 211-cold source shunting, 211a-cold source shunting, interflow, 212-cold source.
Fig. 3 is the system process figure of the embodiment of the present invention 3.
301-thermal source, the cold source of 302-, 303-preheater, 304-vaporizer, 305-decompressor, 306-regenerator, 307-condenser, 308-working medium pump, 309-generator, 310-powers, 303a-preheater, 304a-vaporizer, 305a-decompressor, 306a-regenerator, 307a-condenser, 308a-working medium pump, 309a-generator, 310a-powers, 311-thermal source is shunted, and 311a-thermal source is shunted, and 312-thermal source collaborates.
Fig. 4 is the system process figure of the embodiment of the present invention 4.
401-thermal source, the cold source of 402-, the cold source of 402a-, 403-preheater, 404-vaporizer, 405-decompressor, 406-regenerator, 407-condenser, 408-working medium pump, 409-generator, 410-powers, 403a-preheater, 404a-vaporizer, 405a-decompressor, 406a-regenerator, 407a-condenser, 408a-working medium pump, 409a-generator, 410a-powers.
Fig. 5 is the system process figure of the embodiment of the present invention 5.
501-thermal source, 501a-thermal source, the cold source of 502-, 503-preheater, 504-vaporizer, 505-decompressor, 506-regenerator, 507-condenser, 508-working medium pump, 509-generator, 510-powers, 503a-preheater, 504a-vaporizer, 505a-decompressor, 506a-regenerator, 507a-condenser, 508a-working medium pump, 509a-generator, 510a-powers.
Embodiment
In order to make technical problem solved by the invention, technical scheme and useful effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. It is to be understood that specific embodiment described herein is only in order to explain the present invention, it is not intended to limit the present invention.
The ORC (organic Rankine cycle) low-temperature afterheat generating system of a kind of optimization as Figure 1-Figure 5, comprises ladder pressure ORC generating set, thermal source and Leng Yuan, and the thermal source runner being connected with described cold source with described thermal source respectively and cold source and course road; Described ladder pressure ORC generating set comprises first step ORC generating set ... N level ORC generating set from big to small successively by its operating pressure, and wherein N is natural number, and N is more than or equal to 2; Every grade of described ORC generating set includes heat source passages and cold source channels; Described thermal source runner is contrary with the flow direction in described cold source and course road; On the flow direction of described thermal source runner, the heat source passages of the described N level ORC generating set of described first step ORC generating set ... is sequentially connected in series in same thermal source runner, or it is connected in parallel in same thermal source runner, or connects different thermal source runners respectively; On the flow direction in described cold source and course road, the cold source channels of the described N level ORC generating set of described first step ORC generating set ... is oppositely sequentially connected in series in same cold source and course road, or it is connected in parallel in same cold source and course road, or connects different cold source and course roads respectively. Working medium circulation pressure in described ORC generating set at different levels is different; Reduce successively along the working medium vaporization temperature in the described ORC generating set of the flow direction arranged in series of described thermal source runner and evaporating pressure; Working medium condensing temperature and condensing pressure in the described ORC generating set of the flow direction arranged in series in described cold source and course road raise successively.
In embodiment more preferably, described N equals 2, and described ladder pressure ORC generating set comprises high pressure ORC generating set and low pressure ORC generating set; On the flow direction of described thermal source runner, the heat source passages of described high pressure ORC generating set and described low pressure ORC generating set is sequentially connected in series in same thermal source runner, or it is connected in parallel in same thermal source runner, or connects different thermal source runners respectively; On the flow direction in described cold source and course road, the cold source channels of described high pressure ORC generating set and described low pressure ORC generating set is oppositely sequentially connected in series in same cold source and course road, or it is connected in parallel in same cold source and course road, or connects different cold source and course roads respectively.
In embodiment more preferably, every grade of described ORC generating set includes preheater, vaporizer, regenerator, condenser, working medium pump, generator and power supply system, also comprise decompressor or turbine; Wherein, described preheater and described vaporizer form described heat source passages, and described condenser forms described cold source channels; Described thermal source 101 flows through described vaporizer and described preheater successively, and described cold source 102 flows through condenser; In described ORC generating set, described condenser is communicated to described regenerator by described working medium pump, then it is connected successively by described preheater and described vaporizer, then it is communicated to described decompressor or described turbine, and then return after described regenerator in described condenser; Described decompressor or described turbine and described generator are in transmission connection, and described generator is electrically connected with described power supply system.
In certain preferred embodiment, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner; On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
In certain preferred embodiment, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner; On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is connected in parallel in same cold source and course road.
In certain preferred embodiment, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is connected in parallel in same thermal source runner; On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
In certain preferred embodiment, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner; On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels connects different cold source and course roads respectively.
In certain preferred embodiment, on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels connects different thermal source runners respectively; On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
Hereinafter illustrate:
Example 1
As shown in Figure 1, thermal source 101, cold source 102, high pressure ORC generating set and low pressure ORC generating set is comprised. Wherein, high pressure ORC generating set comprises preheater 103, vaporizer 104, decompressor 105, regenerator 106, condenser 107, working medium pump 108, generator 109 and power supply system 110; Low pressure ORC generating set comprises preheater 103a, vaporizer 104a, decompressor 105a, regenerator 106a, condenser 107a, working medium pump 108a, generator 109a and power supply system 110a.
During operation, the cycle fluid in high pressure ORC generating set has higher evaporating pressure and higher condensing pressure.
First thermal source 101 flows through vaporizer 104 and preheater 103, provides heat to high pressure ORC generating set. Then flow through vaporizer 104a and preheater 103a, provide heat to low pressure ORC generating set.
First cold source 102 flows through condenser 107a, provides cold to low pressure ORC generating set. Then flow through condenser 107, provide cold to high pressure ORC generating set.
In High-voltage generator set, liquid circulation working medium flows through regenerator 106 under the driving of working medium pump 108, sends into preheater 103 and vaporizer 104 successively, and working medium is heated to gaseous state, then sends into decompressor 105. Decompressor 105 drives generator 109, outwards powers. After decompressor 105 expands externally acting, working medium flows through regenerator 106, sends into condenser 107, and working medium is cooled to liquid state, returns to working medium pump 108, forms circulation loop. Wherein, in regenerator 106, carry out heat exchange from decompressor 105 working medium out with from working medium pump 108 working medium out.
In low pressure generating set, liquid circulation working medium flows through regenerator 106a under the driving of working medium pump 108a, sends into preheater 103a and vaporizer 104a successively, and working medium is heated to gaseous state, then sends into decompressor 105a. Decompressor 105a drives generator 109a, outwards powers. After decompressor 105a expands externally acting, working medium flows through regenerator 106a, sends into condenser 107a, and working medium is cooled to liquid state, returns to working medium pump 108a, forms circulation loop. Wherein, in regenerator 106a, carry out heat exchange from decompressor 105a working medium out with from working medium pump 108a working medium out.
By being arranged in series, high pressure ORC generating set can obtain higher vaporization temperature and evaporating pressure, thus obtains higher generating efficiency.
By being arranged in series, low pressure ORC generating set can obtain lower condensing temperature and condensing pressure, thus obtains higher generating efficiency.
This system is while fully reclaiming heat from heat source and cold source cold, it is to increase overall cycle efficiency, thus increases gross generation.
In addition, if when heat source temperature fluctuates, the impact of low pressure ORC unit is less. With reason, the fluctuation of cold source temperature is less on the impact of high pressure ORC unit. Therefore this system can improve the adaptive faculty to operating mode.
Example 2
As shown in Figure 2, thermal source 201, cold source 202, high pressure ORC generating set and low pressure ORC generating set is comprised. Wherein, high pressure ORC generating set comprises preheater 203, vaporizer 204, decompressor 205, regenerator 206, condenser 207, working medium pump 208, generator 209 and power supply system 210; Low pressure ORC generating set comprises preheater 203a, vaporizer 204a, decompressor 205a, regenerator 206a, condenser 207a, working medium pump 208a, generator 209a and power supply system 210a.
During operation, the cycle fluid in high pressure ORC generating set has higher evaporating pressure.
First thermal source 201 flows through vaporizer 204 and preheater 203, provides heat to high pressure ORC generating set. Then flow through vaporizer 204a and preheater 203a, provide heat to low pressure ORC generating set.
Cold source 202 is split into two strands, is respectively cold source shunting 211 and cold source shunting 211a. Cold source shunting 211a flows through condenser 207a, provides cold to low pressure ORC generating set. Cold source shunting 211 flows through condenser 107, provides cold to high pressure ORC generating set. After being cooled by two ORC generating set, cold source shunting 211 and cold source shunting 211a converge into interflow, cold source 212.
In High-voltage generator set, liquid circulation working medium flows through regenerator 206 under the driving of working medium pump 208, sends into preheater 203 and vaporizer 204 successively, and working medium is heated to gaseous state, then sends into decompressor 205. Decompressor 205 drives generator 209, outwards powers. After decompressor 205 expands externally acting, working medium flows through regenerator 206, sends into condenser 207, and working medium is cooled to liquid state, returns to working medium pump 208, forms circulation loop. Wherein, in regenerator 206, carry out heat exchange from decompressor 205 working medium out with from working medium pump 208 working medium out.
In low pressure generating set, liquid circulation working medium flows through regenerator 206a under the driving of working medium pump 208a, sends into preheater 203a and vaporizer 204a successively, and working medium is heated to gaseous state, then sends into decompressor 205a. Decompressor 205a drives generator 209a, outwards powers. After decompressor 205a expands externally acting, working medium flows through regenerator 206a, sends into condenser 207a, and working medium is cooled to liquid state, returns to working medium pump 208a, forms circulation loop. Wherein, in regenerator 206a, carry out heat exchange from decompressor 205a working medium out with from working medium pump 208a working medium out.
By being arranged in series, high pressure ORC generating set can obtain higher vaporization temperature and evaporating pressure, thus obtains higher generating efficiency.
This system is while fully reclaiming heat from heat source, it is to increase overall cycle efficiency, thus increases gross generation.
In addition, if when heat source temperature fluctuates, the impact of low pressure ORC unit is less, it is possible to improve system to the adaptive faculty of operating mode.
Example 3
As shown in Figure 3, thermal source 301, cold source 302, high pressure ORC generating set and low pressure ORC generating set is comprised. Wherein, high pressure ORC generating set comprises preheater 303, vaporizer 304, decompressor 305, regenerator 306, condenser 307, working medium pump 308, generator 309 and power supply system 310; Low pressure ORC generating set comprises preheater 303a, vaporizer 304a, decompressor 305a, regenerator 306a, condenser 307a, working medium pump 308a, generator 309a and power supply system 310a.
During operation, the cycle fluid in low pressure ORC generating set has lower condensing pressure.
Thermal source 301 is split into two strands, is respectively thermal source shunting 311 and thermal source shunting 311a. Thermal source shunting 311 flows through vaporizer 304 and preheater 303, provides heat to high pressure ORC generating set. Thermal source shunting 311a flows through vaporizer 304a and preheater 303a, provides heat to low pressure ORC generating set. After transferring heat to two ORC generating set, thermal source shunting 311 and thermal source shunting 311a converge into thermal source interflow 312.
First cold source 302 flows through condenser 307a, provides cold to low pressure ORC generating set. Then flow through condenser 307, provide cold to high pressure ORC generating set.
In High-voltage generator set, liquid circulation working medium flows through regenerator 306 under the driving of working medium pump 308, sends into preheater 303 and vaporizer 304 successively, and working medium is heated to gaseous state, then sends into decompressor 305. Decompressor 305 drives generator 309, outwards powers. After decompressor 305 expands externally acting, working medium flows through regenerator 306, sends into condenser 307, and working medium is cooled to liquid state, returns to working medium pump 308, forms circulation loop. Wherein, in regenerator 306, carry out heat exchange from decompressor 305 working medium out with from working medium pump 308 working medium out.
In low pressure generating set, liquid circulation working medium flows through regenerator 306a under the driving of working medium pump 308a, sends into preheater 303a and vaporizer 304a successively, and working medium is heated to gaseous state, then sends into decompressor 305a. Decompressor 305a drives generator 309a, outwards powers. After decompressor 305a expands externally acting, working medium flows through regenerator 306a, sends into condenser 307a, and working medium is cooled to liquid state, returns to working medium pump 308a, forms circulation loop. Wherein, in regenerator 306a, carry out heat exchange from decompressor 305a working medium out with from working medium pump 308a working medium out.
By being arranged in series, low pressure ORC generating set can obtain lower condensing temperature and condensing pressure, thus obtains higher generating efficiency.
This system is while fully reclaiming cold source cold, it is to increase overall cycle efficiency, thus increases gross generation.
In addition, if when cold source temperature fluctuates, the impact of high pressure ORC unit is less, it is possible to improve system to the adaptive faculty of operating mode.
Example 4
As shown in Figure 4, thermal source 401, cold source 402, cold source 402a, high pressure ORC generating set and low pressure ORC generating set is comprised. Wherein, high pressure ORC generating set comprises preheater 403, vaporizer 404, decompressor 405, regenerator 406, condenser 407, working medium pump 408, generator 409 and power supply system 410; Low pressure ORC generating set comprises preheater 403a, vaporizer 404a, decompressor 405a, regenerator 406a, condenser 407a, working medium pump 408a, generator 409a and power supply system 410a.
During operation, the cycle fluid in high pressure ORC generating set has higher evaporating pressure.
First thermal source 401 flows through vaporizer 404 and preheater 403, provides heat to high pressure ORC generating set. Then flow through vaporizer 404a and preheater 403a, provide heat to low pressure ORC generating set.
Cold source 402 flows through condenser 407, provides cold to high pressure ORC generating set. Cold source 402a flows through condenser 407a, provides cold to low pressure ORC generating set.
The operation of ORC generating set is identical with example 1.
By being arranged in series, high pressure ORC generating set can obtain higher vaporization temperature and evaporating pressure, thus obtains higher generating efficiency.
This system fully reclaiming heat from heat source simultaneously, it is to increase overall cycle efficiency, thus increases gross generation.
Example 5
As shown in Figure 5, thermal source 501, thermal source 501a, cold source 502, high pressure ORC generating set and low pressure ORC generating set is comprised. Wherein, high pressure ORC generating set comprises preheater 503, vaporizer 504, decompressor 505, regenerator 506, condenser 507, working medium pump 508, generator 509 and power supply system 510; Low pressure ORC generating set comprises preheater 503a, vaporizer 504a, decompressor 505a, regenerator 506a, condenser 507a, working medium pump 508a, generator 509a and power supply system 510a.
During operation, the cycle fluid in low pressure ORC generating set has lower condensing pressure.
Thermal source 501 flows through vaporizer 504 and preheater 503 successively, provides heat to high pressure ORC generating set. Thermal source 501a flows through vaporizer 504a and preheater 503a successively, provides heat to low pressure ORC generating set.
First cold source 502 flows through condenser 507a, provides cold to low pressure ORC generating set. Then flow through condenser 507, provide cold to high pressure ORC generating set.
The operation of ORC generating set is identical with example 1.
By being arranged in series, low pressure ORC generating set can obtain lower condensing temperature and condensing pressure, thus obtains higher generating efficiency.
This system fully reclaiming cold source cold simultaneously, it is to increase overall cycle efficiency, thus increases gross generation.
Detailed in preferred embodiment the present invention is described above by concrete; but those skilled in the art should be understood that; the present invention is not limited to the above embodiment; within the spirit and principles in the present invention all; the any amendment done, equivalent replacement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an ORC (organic Rankine cycle) low-temperature afterheat generating system, it is characterised in that: comprise ladder pressure ORC generating set, thermal source and Leng Yuan, and the thermal source runner being connected with described thermal source and the cold source and course road being connected with described cold source; Described ladder pressure ORC generating set by its operating pressure comprise successively from big to small first step ORC generating set ... N level ORC generating set, wherein N is natural number, and N is more than or equal to 2; Every grade of described ORC generating set includes heat source passages and cold source channels;
Described thermal source runner is contrary with the flow direction in described cold source and course road;
On the flow direction of described thermal source runner, described first step ORC generating set ... the heat source passages of described N level ORC generating set is sequentially connected in series in same thermal source runner, or it is connected in parallel in same thermal source runner, or connects different thermal source runners respectively;
On the flow direction in described cold source and course road, described first step ORC generating set ... the cold source channels of described N level ORC generating set is oppositely sequentially connected in series in same cold source and course road, or it is connected in parallel in same cold source and course road, or connects different cold source and course roads respectively.
2. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: described N equals 2, and described ladder pressure ORC generating set comprises high pressure ORC generating set and low pressure ORC generating set;
On the flow direction of described thermal source runner, the heat source passages of described high pressure ORC generating set and described low pressure ORC generating set is sequentially connected in series in same thermal source runner, or it is connected in parallel in same thermal source runner, or connects different thermal source runners respectively;
On the flow direction in described cold source and course road, the cold source channels of described high pressure ORC generating set and described low pressure ORC generating set is oppositely sequentially connected in series in same cold source and course road, or it is connected in parallel in same cold source and course road, or connects different cold source and course roads respectively.
3. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
4. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is connected in parallel in same cold source and course road.
5. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is connected in parallel in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
6. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels is sequentially connected in series in same thermal source runner;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels connects different cold source and course roads respectively.
7. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: on the flow direction of described thermal source runner, the heat source passages of described ORC generating set at different levels connects different thermal source runners respectively;
On the flow direction in described cold source and course road, the cold source channels of described ORC generating set at different levels is oppositely sequentially connected in series in same cold source and course road.
8. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: every grade of described ORC generating set includes preheater, vaporizer, regenerator, condenser, working medium pump, generator and power supply system, also comprises turbine; Wherein, described preheater and described vaporizer form described heat source passages, and described condenser forms described cold source channels;
Described thermal source (101) flows through described vaporizer and described preheater successively, and described cold source (102) flows through condenser;
In described ORC generating set, described condenser is communicated to described regenerator by described working medium pump, then it is connected successively by described preheater and described vaporizer, then it is communicated to described turbine, and then return after described regenerator in described condenser;
Described turbine and described generator are in transmission connection, and described generator is electrically connected with described power supply system.
9. ORC (organic Rankine cycle) low-temperature afterheat generating system according to claim 1, it is characterised in that: the working medium circulation pressure in described ORC generating set at different levels is different; Reduce successively along the working medium vaporization temperature in the described ORC generating set of the flow direction arranged in series of described thermal source runner and evaporating pressure; Working medium condensing temperature and condensing pressure in the described ORC generating set of the flow direction arranged in series in described cold source and course road raise successively.
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| CN111075521B (en) * | 2019-12-18 | 2022-09-20 | 北京石油化工学院 | High-low pressure double working medium ORC power generation system with regenerative cycle |
| CN114352368B (en) * | 2022-01-07 | 2023-08-29 | 北京石油化工学院 | Oil delivery station boiler flue gas waste heat recovery system based on thermoelectric generation and organic Rankine cycle |
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| NZ541501A (en) * | 2003-02-03 | 2008-12-24 | Kalex Llc | Power cycle and system for utilizing moderate and low temperature heat sources |
| US7942001B2 (en) * | 2005-03-29 | 2011-05-17 | Utc Power, Llc | Cascaded organic rankine cycles for waste heat utilization |
| WO2009045196A1 (en) * | 2007-10-04 | 2009-04-09 | Utc Power Corporation | Cascaded organic rankine cycle (orc) system using waste heat from a reciprocating engine |
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Application publication date: 20150114 Assignee: Jindingke Chemical Science-Technology Co., Ltd., Beijing Assignor: BEIJING HUAHANG SHENGSHI ENERGY TECHNOLOGY CO., LTD. Contract record no.: 2017990000398 Denomination of invention: Optimized organic Rankine cycle low temperature exhaust heat power generation system Granted publication date: 20160601 License type: Common License Record date: 20171012 |