CN202420252U - Cylindrical system for generating power with waste heat of medium and low temperature smoke evaporating from organic medium - Google Patents

Abstract

The utility model provides a cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system, which belongs to the technical field of energy and environment. Including the heat pipe system, the working fluid circulation circuit of the organic Rankine cycle, the medium and low temperature flue gas exhaust pipe, the heating water circuit and the cooling water circuit, the heat pipe is used to replace the riser and downcomer of the boiler, the flue gas heat exchanger and The drum is an integrated cylindrical structure, which is divided into an upper drum and a lower flue gas heat exchanger by two layers of heat-insulating partitions. The lower section of the heat pipe is placed in the flue gas heat exchanger and the upper section is placed in the drum. Toluene, three Fluorodichloroethane, propane, pentafluoropropane, etc. are used as circulating working fluids, and the working fluid of the heat pipe is softened desalted water with 20% of the volume of the heat pipe. It has the advantages of small space occupied by the heat pipe system, small heat exchange between heat pipe and air, high heat exchange efficiency, convenient replacement of heat pipe, avoiding corrosion of heat exchange pipe and leakage of working fluid, etc., and can adjust the exhaust of organic Rankine cycle according to the demand of heating load heat back.

Description

Cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system

technical field

The utility model relates to a cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system, which belongs to the technical field of energy and environment. the

Background technique

At present, the medium and low temperature flue gas waste heat power generation system performs heat exchange through the boiler's ascending tube and downcomer. In the pipeline, it leads to the waste of organic working fluid and the decline of heat exchange efficiency, and the replacement of the riser and downcomer of the boiler is very difficult, which is not conducive to the normal operation of the system and cost control. the

The heat pipe is the most basic element of the heat pipe heat exchanger. Judging from its appearance, it is usually an ordinary round tube with fins or no fins, and its main structural features are shown in the tube. A heat pipe consists of a shell, a capillary porous material (core) and a vapor chamber (steam channel). From the perspective of heat transfer, the heat pipe can be divided into three parts: the evaporation section, the adiabatic section and the condensation section along the axial direction. When working, the evaporating section evaporates the working liquid in the capillary material due to heating, and the steam flows to the condensing section, where the steam condenses into liquid due to cooling, and the liquid flows back to the evaporating section along the porous material by capillary force. In this endless cycle, heat is transferred from one end of the heat pipe to the other end. Due to the large latent heat of vaporization, a large amount of heat can be transferred from the evaporation section of the heat pipe to the condensation section under a very small temperature difference. the

足够大的毛细抽吸压头；

较小的液体流动阻力，既有较高的渗透率；良好的传热特性，即有较小的径向热阻。因而，管芯的结构有很多种，大致可分为以下几类：

紧贴管壁的单层及多层网芯；烧结粉末管芯，它是由一定目数的金属粉末或金属丝网烧结在管内壁面而成；轴向槽道式管芯，它是在管壳内壁开轴向细槽，以提供毛细压头及液体回流通道，槽的截面形状可有矩形，梯形等多种；组合管芯。一般管芯往往不能同时兼顾毛细抽吸力及渗透率，组合管芯既能兼顾毛细力和渗透率，从而获得高的轴向传热能力，而且大多数管芯的径向热阻甚小。他基本上把管芯分成两部分，一部分起毛细抽吸作用，一部分起液体回流通道作用。  The core of the heat pipe is a capillary structure that is close to the inner wall of the shell. It is usually lined with multi-layer wire mesh, fiber, cloth, etc. to reduce the contact thermal resistance. The lining can also be made of porous ceramics or sintered metal. A die with good performance should have:

Sufficiently large capillary suction head;

Small liquid flow resistance, high permeability; Good heat transfer characteristics, that is, small radial thermal resistance. Therefore, there are many structures of the die, which can be roughly divided into the following categories:

Single-layer and multi-layer mesh cores that are close to the pipe wall; Sintered powder tube core, which is made of a certain number of metal powder or wire mesh sintered on the inner wall of the tube; Axial channel type tube core, which is an axial thin groove on the inner wall of the shell to provide capillary pressure head and liquid return channel. The cross-sectional shape of the groove can be rectangular, trapezoidal, etc.; Composite die. Ordinary tube cores often cannot take into account capillary suction and permeability at the same time. Combined tube cores can take both capillary force and permeability into consideration, thereby obtaining high axial heat transfer capacity, and most tube cores have very small radial thermal resistance. He basically divided the die into two parts, one part acts as a capillary suction, and the other part acts as a liquid return channel.

The working fluid of the heat pipe must have high latent heat of vaporization, thermal conductivity, suitable saturation pressure and boiling point, low viscosity and good stability. The working liquid should also have a large surface tension and the ability to wet the capillary structure, so that the capillary structure can act on the working liquid and generate the necessary capillary force. The working fluid cannot dissolve the capillary structure and tube wall, otherwise the dissolved substances will accumulate in the evaporation section and destroy the capillary structure. the

Due to the advantages of the heat pipe structure and the working fluid, using it to replace the riser and downcomer of the boiler can not only greatly improve the working efficiency of the boiler, make the steam temperature higher, but also avoid the long-term damage of the organic working medium pipe in the flue. Corrosion and cracking caused by flue gas erosion, resulting in leakage of organic working fluid and decrease in heat exchange efficiency. the

Contents of the invention

The purpose of this utility model is to provide a cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system, which adopts an integrated cylindrical structure divided into a drum and a flue gas heat exchanger through a partition, and replaces the boiler with a heat pipe The rising tube and the down tube solve the problems that the boiler heat exchange pipe is easily eroded by flue gas and the heat exchange efficiency is not high. the

The solution adopted to solve the technical problem of the utility model is: a cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system, including a heat pipe heat exchange system, an organic working medium Rankine cycle loop, a medium and low temperature flue gas exhaust pipeline, Heating hot water circuit and cooling water circuit; heat pipe heat exchange system includes heat pipe 2, flue gas heat exchanger 4 and drum 1, which replace the riser and downcomer of the boiler, and the flue gas heat exchanger 4 and drum 1 are arranged horizontally The integrated cylindrical structure, in the middle is divided into the upper drum 1 and the lower flue gas heat exchanger 4 by two layers of heat insulating partitions 3, the heat pipe 2 is vertically arranged in the integrated cylindrical structure, and the lower section is placed The middle and upper sections of the flue gas heat exchanger 4 are placed in the drum 1; the rankine circulation circuit of the organic working medium is composed of a liquid storage tank 18, a working medium booster pump 14, an exhaust gas recovery heater 9, and an organic working medium circulating pump 5. The drum 1, the turbine 6, the three-way regulating valve 8, the hot water heater 10, the condenser 12, and the pipelines connecting them are composed. The working medium booster pump 14 is connected to the outlet of the liquid storage tank 18 and the Between the inlet of the heat exchange tube in the exhaust gas recuperation heater 9, the circulation pump 5 is connected between the outlet of the heat exchange tube in the exhaust gas recovery heater 9 and the inlet of the drum 1 through a pipeline, and the upper part of the drum 1 is connected to the permeable tube through a pipeline. The inlet of the flat 6 is connected, the outlet of the turbine 6 is connected to the inlet of the exhaust gas recuperation heater 9 and the inlet of the hot water heater 10 through the three-way regulating valve 8, and the inlet and outlet of the condenser 12 are connected through the pipeline They are respectively connected to the gas outlet of the hot water heater 10 and the inlet of the liquid storage tank 18; the medium and low temperature flue gas exhaust pipeline is composed of the flue gas heat exchanger 4, the hot water preheater 15, the exhaust fan 17, and the pipelines connecting them Composition, the inlet of the flue gas heat exchanger 4 is connected to the medium and low temperature flue gas pipeline, the outlet is connected to the air inlet of the hot water preheater 15 through the pipeline, and the gas outlet of the hot water preheater 15 is connected to the chimney through the exhaust fan 17 and the pipeline; The hot water circuit is composed of the heat exchange tube in the hot water preheater 15, the return pump 16, the heat user, the heat exchange tube in the hot water heater 10, and the pipelines connecting them in sequence; the cooling water circuit is composed of the cooling tower 11, The cooling water circulation pump 13, the condenser 12, and the pipelines connecting them are composed. The cooling water circulation pump 13 is connected between the inlet of the heat exchange tube in the condenser 12 and the outlet at the bottom of the cooling tower 11 through pipelines, and the outlet of the heat exchange tube in the condenser 12 is It is connected with the water distribution pipe at the upper end of the cooling tower 11. the

The organic Rankine cycle working fluid is toluene, trifluorodichloroethane (R123), propane (R290), pentafluoropropane (R245fa), pentane (R601), isopentane (R601a), n-pentane ( C ₅ H ₁₂ ), n-hexane (C ₆ H ₁₄ ), butane (R600), isobutane (R600a), tetrafluoroethane (R134a), or any mixture of several, according to actual needs Specific options.

The heat pipe 2 is a two-phase thermosiphon, and its evaporating section and condensing section are provided with fins for enhancing heat transfer. The length of the thermosiphon and the number of fins on it are specifically determined according to actual needs. the

The quantity of the working fluid in the heat pipe 2 is 15-30% of the volume of the inner cavity of the heat pipe, which is determined according to actual needs, and the working fluid is softened desalted water. the

Air is flushed between the two layers of separators 3 to play a role of heat insulation. the

According to the type of working fluid selected by the organic Rankine cycle system, the system is equipped and installed with a drum, heat pipe, flue gas heat exchanger, organic working medium circulation pump, working medium booster pump, etc. according to the required power generation capacity and heating load. Exhaust gas recovery heater, turbine, excitation generator, hot water heater, condenser, hot water preheater, smoke exhaust fan, cooling tower and other equipment, pipelines and accessories; Calculate the charging amount of the circulating working fluid based on the volume of the circuit, and measure and fill the circulating working medium into the circulating pipeline. the

The working principle of this system is: the lower section of the heat pipe 2 (evaporation section) is placed in the flue gas heat exchanger 4, so that the heat of the medium and low temperature flue gas drawn from the boiler is transferred to the evaporation section of the heat pipe 2, and the work in the heat pipe 2 The liquid is heated and evaporated, and flows to the upper section of the heat pipe 2 (condensation section), where the heat is transferred to the circulating organic working fluid in the drum 1, and then the working fluid in the heat pipe 2 is cooled and then flows back to the evaporation section The liquid working medium coming out from the liquid storage tank 18 is pressurized to the evaporation pressure by the working medium booster pump 14, and enters the exhaust gas reheating heater 9 for preheating, and the low-temperature organic working medium after preheating is circulated by the organic working medium The pump 5 is pressurized into the drum 1 and the condensation section of the heat pipe 2 for heat exchange, so that the low-temperature organic working medium is heated and evaporated, and the steam and water are separated in the drum 1. The organic working medium steam flows out from the upper part of the drum 1 and is sent to the turbine. (expander) 6 works and outputs shaft work to drive the excitation generator 7 to generate electricity; the exhaust steam is divided into two ways through the diversion three-way regulating valve: one way is the intake and exhaust reheating heater 9 to preheat and come out from the liquid storage to be heated by the working medium The liquid working medium pressurized by the pressure pump 14 to the evaporation pressure, and the other way is directly mixed with the working medium steam from the exhaust gas recovery heater 9 and enters the hot water supply heater 10 to heat the circulating hot water, and then enters the condenser 12 to condense , into the working fluid storage tank 18 to complete a cycle. The medium and low temperature flue gas from the boiler enters the lower end of the heat pipe 2 (evaporation section) for heat exchange, then enters the hot water preheater 15 to preheat the return water, and then is pressurized by the exhaust fan 17 and discharged to the chimney; from the heat user The return water is sent to the hot water preheater 15 for preheating through the return water pump 16, and then enters the hot water heater 10 to complete the heating process of hot water; the cooling water from the cooling tower 11 is sent to the organic Rankine cycle through the cooling water circulation pump 13 The condenser 12 completes the condensation of the exhausted steam of the circulating working medium, and then returns to the cooling tower 11 to distribute the water pipes. After cooling, it collects in the water collection tray at the bottom of the tower to complete a cycle. Through the split three-way regulating valve 8 set on the exhaust steam pipeline of the turbine, the exhaust gas return heat of the organic Rankine cycle can be adjusted according to the user's demand for heating load. the

This system uses heat pipes to replace the ascending pipe and descending pipe of the boiler, cooperates with the cylindrical heat pipe heat exchange system integrated with the flue gas heat exchanger and the drum, and the organic refrigerant Rankine cycle. Compared with the existing technology, it has the following advantages: Beneficial effect:

(1) It can avoid the leakage of working fluid and the decrease of thermal efficiency caused by the corrosion of the rising pipe and the descending pipe of the boiler due to long-term contact with flue gas;

(2) Strengthen the heat transfer of flue gas, organic working fluid and water in the heat pipe, which is conducive to the improvement of heat exchange efficiency, so that the organic working medium can effectively meet the evaporation standard;

(3) The use of a cylindrical steam generator integrated with a boiler and a flue gas heat exchanger greatly reduces the space occupied by the generator, shortens the length of the effective working heat pipe, and avoids the heat exchange between the heat pipe and the ambient air, which is beneficial to reduce heat loss;

(4) It can provide domestic hot water and other required thermal energy while converting the waste heat of medium and low temperature flue gas into high-grade electric energy safely, reliably and efficiently;

(5) Greatly reduced the generation and emission of environmentally harmful substances CO _X and SO _X in the cogeneration process;

(6) It is convenient to realize the personalized distributed combined heat and power system and meet the requirements of modern technology.

Description of drawings

Fig. 1 is the schematic diagram of the utility model system. the

In the figure: 1-drum; 2-heat pipe; 3-baffle; 4-flue gas heat exchanger; 5-working fluid circulation pump; 6-turbine (expander); 7-excitation generator; 8-three 9-exhaust heat recovery heater; 10-hot water heater; 11-cooling tower; 12-condenser; 13-cooling water circulation pump; 14-working fluid pressure pump; 15-hot water preheating Device; 16-return water pump; 17-exhaust fan; 18-liquid storage tank. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated, but the protection scope of the utility model is not limited to described content. the

Example 1: A high-line three-stage walking heating furnace in a steel plant, build a cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation co-supply household system, the output power of the motor is 10Kw, supply 45 ~ 50 ℃ sanitary heat Water 600l/d. the

This cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system includes a heat pipe heat exchange system, an organic working fluid Rankine cycle loop, a medium and low temperature flue gas exhaust pipeline, a heating hot water loop and a cooling water loop; The heat system includes the heat pipe 2 replacing the riser and downcomer of the boiler, the flue gas heat exchanger 4 and the drum 1, and the flue gas heat exchanger 4 and the drum 1 are horizontally arranged integrated cylindrical structures, in the middle of which there are two The first layer of heat-insulating partition 3 is divided into the upper drum 1 and the lower flue gas heat exchanger 4, the heat pipe 2 is vertically arranged in the integrated cylindrical structure, the lower section is placed in the flue gas heat exchanger 4, and the upper section is placed in the flue gas heat exchanger 4. Drum 1; the organic working fluid Rankine circulation loop consists of a liquid storage tank 18, a working fluid booster pump 14, an exhaust gas recovery heater 9, an organic working fluid circulating pump 5, a drum 1, a turbine 6, and a tee The regulating valve 8, the hot water heater 10, the condenser 12, and the pipelines connecting them are composed. The working medium booster pump 14 is connected to the outlet of the liquid storage tank 18 and the inlet of the heat exchange tube in the exhaust gas recovery heater 9 through the pipeline. Between them, the working fluid circulation pump 5 is connected between the outlet of the heat exchange tube in the exhaust gas recuperation heater 9 and the inlet of the drum 1 through a pipeline, the upper part of the drum 1 is connected with the inlet of the turbine 6 through a pipeline, and the outlet of the turbine 6 is connected through a pipeline. The three-way regulating valve 8 is connected with the air inlet of the exhaust gas recuperation heater 9 and the air inlet of the hot water heater 10 respectively, and the air inlet and the air outlet of the condenser 12 are respectively connected with the air outlet of the hot water heater 10 and the air outlet of the hot water heater through pipelines. The inlet of the liquid storage tank 18 is connected; the medium and low temperature flue gas exhaust pipeline is composed of the flue gas heat exchanger 4, the hot water preheater 15, the exhaust fan 17, and the pipes connecting them. The medium and low temperature flue gas pipeline and outlet are connected to the inlet of hot water preheater 15 through the pipeline, and the outlet of hot water preheater 15 is connected to the chimney through the exhaust fan 17 and the pipeline; the heating hot water circuit is controlled by the hot water preheater 15 internal heat exchange tubes, return water pump 16, heat users, heat exchange tubes in the hot water heater 10, and the pipelines that connect them in sequence; the cooling water circuit is composed of cooling tower 11, cooling water circulation pump 13, condenser 12, and The pipelines that connect them constitute, the cooling water circulation pump 13 is connected between the heat exchange tube inlet in the condenser 12 and the outlet at the bottom of the cooling tower 11 through the pipeline, and the heat exchange tube outlet in the condenser 12 is connected with the water distribution pipe at the upper end of the cooling tower 11. the

The working fluid in the heat pipe 2 of this system is softened desalted water with high latent heat of vaporization and thermal conductivity, moderate saturation pressure and boiling point, low viscosity, good stability, and high surface tension and capillary wetting ability. According to the flue gas volume of 50000kg/h, temperature of 573K, and Cp1kg/(kJ.K), the heat pipe 2 adopts two-phase thermosiphon tubes, a total of 950 tubes, each tube is 5m long, and there are 40 pieces of enhanced heat transfer fins on the upper and lower sections respectively. The tube is filled with 20% V (heat tube volume) of softened desalted water. The water in the heat pipe 2 absorbs the heat of the medium and low temperature flue gas in the evaporating section to evaporate the water in the capillary material, and the steam flows to the condensing section, where it exchanges heat with the organic working medium in the drum 1, and the steam is cooled Condensed into a liquid, the working liquid water flows back to the evaporation section along the porous material by capillary force. the

The organic Rankine cycle working fluid of this system uses trifluorodichloroethane (R123); the wall thickness of the drum 1 is 16mm, and the diameter is 1200mm; the expander 6 adopts an IT10 screw type expander with a net output power of 10Kw, imported The mass pressure is 1.0MPa, and the temperature is 110°C; the exhaust gas recovery heater 9, the hot water heater 10, and the condenser 12 all adopt plate heat exchangers; the working fluid booster pump 14 adopts a high-pressure shielded pump. According to the outlet of liquid storage tank 18--organic working medium booster pump 14--exhaust gas reheat heater 9--organic working medium circulation pump 5--drum 1--turbine (expander) 6--excitation power generation Machine 7--Exhaust heat recovery heater 9--Hot water heater 10--Condenser 12--The order of the inlet of liquid storage tank 18, connect each device with copper tubes and related accessories to form an organic Rankine cycle Working medium circuit. the

The hot water supply circuit of this system adopts PPR hot water pipes. According to the order of return water pump 16 outlet—hot water preheater 15—hot water heater 10—return water pump 16 inlet, all devices are connected with seamless steel pipes and related accessories. Form a hot water supply circuit. The cooling tower 11 is a low-temperature cooling tower LBCM-20 with a cooling water circulation flow rate of 20m ³ /h, the cooling water circulation pump is a 12KQL50/100-1.1/2 model, and the cooling water pipeline is based on the outlet of the cooling tower 11—cooling water circulation pump 13—condensation Device 12—the order of cooling tower 11 inlets, use seamless steel pipes and related accessories to connect each device to form a cooling water circuit.

This system introduces the medium and low temperature flue gas from the boiler into the lower end of the heat pipe 2 (evaporation section) through the medium and low temperature flue gas pipeline for heat exchange, and then enters the hot water preheater 15 to preheat the return water, and finally pressurizes it through the exhaust fan 17 It is discharged to the chimney to form a medium and low temperature flue gas exhaust pipeline. The medium and low temperature flue gas exhaust pipe is welded with 2mm hot-rolled steel plates, and the chimney is a steel structure with a diameter of 300mm. According to the sequence of flue gas heat exchanger 4--hot water preheater 15-exhaust fan 17-chimney, Install the flue gas line. the

All equipment and accessories of this system are connected according to Figure 1. After the installation is completed, nitrogen purging of the pipeline is carried out to vacuum the organic Rankine cycle system, and R123 and tap water are filled into the corresponding pipelines as required. the

Example 2: This cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system is the same as Example 1, the organic Rankine cycle working fluid used is propane R290; the thermosiphon is vertically inclined at 30 ^° , and a two-phase thermosiphon is used , a total of 1,000 tubes, each tube is 4.5m long, and there are 32 enhanced heat transfer fins on the upper and lower sections; the thermosiphon tube is filled with 25% V (heat pipe volume) of softened desalted water.

Example 3: This cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system is the same as that of Example 1, and the organic Rankine cycle working fluids used are toluene, pentane R601, and tetrafluoroethane R134a, respectively at 30% , 25%, and 45% volume ratio; the thermosiphon is vertically inclined at 50 ⁰ , and a total of 900 two-phase thermosiphons are used. Each tube is 5.5m long, and there are 48 enhanced heat transfer fins on the upper and lower sections. ; The thermosiphon is filled with 30% V (heat pipe volume) of softened desalted water.

Example 4: This cylindrical organic medium evaporation medium and low temperature flue gas waste heat power generation system is the same as Example 1, and the organic Rankine cycle working fluids used are toluene, trifluorodichloroethane R123, propane R290, and pentafluoropropane _{10 % , _} 15%, 5%, 6%, 8%, 11%, 5%, 7%, 5%, 18%, 10% volume ratio is mixed; the thermosiphon is vertically inclined at 40 ⁰ , and the two-phase thermosiphon, There are 1100 tubes in total, each tube is 4m long, and there are 24 enhanced heat transfer fins on the upper and lower sections respectively; the thermosiphon tubes are filled with 15% V (heat pipe volume) softened desalted water.

Claims (5)

1. low-temperature flue gas afterheat generating system during a drum type brake organic media evaporates is characterized in that: comprise the heat pipe heat exchanging system, organic working medium Rankine cycle loop, middle low-temperature flue gas smoke evacuation pipeline, heat supply hot-water return and chilled(cooling) water return (CWR); The heat pipe heat exchanging system comprises heat pipe (2), flue gas heat exchange device (4) and drum (1); Flue gas heat exchange device (4) and drum (1) are horizontally disposed integrated cylinder-like structure; Be divided into the drum (1) on top and the flue gas heat exchange device (4) of bottom by two-layer thermal baffle (3) wherein; Heat pipe (2) is vertical to be arranged in the integrated tubular structure, and its hypomere places flue gas heat exchange device (4), epimere to place drum (1); Organic working medium Rankine cycle loop constitutes by fluid reservoir (18), force (forcing) pump (14), exhaust bleeder heater (9), organic working medium circulating pump (5), drum (1), turbine (6), three-way control valve (8), hot-water heater (10), condenser (12) and with the pipeline that their connect; Force (forcing) pump (14) is between heat exchanger tube enters the mouth in pipeline is connected in fluid reservoir (18) outlet and exhaust bleeder heater (9); Between circulating pump (5) heat exchanger tube in pipeline is connected in exhaust bleeder heater (9) exports and drum (1) enters the mouth; Drum (1) top is connected with turbine (6) import through pipeline; Turbine (6) outlet is connected with hot-water heater (10) air inlet with exhaust bleeder heater (9) air inlet respectively through three-way control valve (8), and the air inlet of condenser (12) is connected with fluid reservoir (18) inlet with hot-water heater (10) gas outlet respectively through pipeline with the gas outlet; Middle low-temperature flue gas smoke exhaust pipe route flue gas heat exchange device (4), hot water preheater (15), smoke exhaust fan (17) and the pipeline formation that their are connected; Low-temperature flue gas pipeline, outlet connect hot water preheater (15) air inlet through pipeline during flue gas heat exchange device (4) inlet connect, and hot water preheater (15) gas outlet is connected with chimney with pipeline through smoke exhaust fan (17); The heat supply hot-water return constitutes by the interior heat exchanger tube of hot water preheater (15), back water pump (16), hot user, the interior heat exchanger tube of hot-water heater (10) and with the pipeline that they connect successively; The chilled(cooling) water return (CWR) constitutes by cooling tower (11), cooling water circulating pump (13), condenser (12) and with the pipeline that their connect; Cooling water circulating pump (13) in pipeline is connected in condenser (12) between heat exchanger tube inlet and cooling tower (11) outlet at bottom, interior the heat exchanger tube of condenser (12) export with cooling tower (11) on water distributor be connected.

2. low-temperature flue gas afterheat generating system in the drum type brake organic media evaporation according to claim 1, it is characterized in that: heat pipe (2) is two phase thermal siphons, and its evaporator section and condensation segment are provided with the fin of augmentation of heat transfer.

3. low-temperature flue gas afterheat generating system in the drum type brake organic media evaporation according to claim 1 and 2, it is characterized in that: the quantity of the interior working solution of heat pipe (2) is the 15-30% of heat pipe inner chamber volume.

4. low-temperature flue gas afterheat generating system in the drum type brake organic media evaporation according to claim 1 and 2, it is characterized in that: the working solution in the heat pipe (2) is a softening desalination water.

5. low-temperature flue gas afterheat generating system in the drum type brake organic media evaporation according to claim 1 is characterized in that: dashing between the two-layer dividing plate (3) has air.