Rectifying tower top steam heat recovery refrigeration water system
By recovering heat from the vapor at the top of the distillation column using an absorption chiller, combined with a top condenser or by directly feeding the vapor into the absorption chiller, the problem of high electricity consumption is solved, cooling water is recycled and energy consumption is reduced, and the system structure is simplified.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHUANGLIANG ECO ENERGY SYST CO LTD
- Filing Date
- 2025-03-20
- Publication Date
- 2026-04-10
AI Technical Summary
In existing technologies, the use of electricity to produce cold water from the top steam of distillation columns consumes electrical energy, increases operating costs for enterprises, and fails to achieve energy-saving effects.
An absorption chiller is used to recover the heat of the vapor at the top of the distillation column. The vapor at the top of the column is condensed directly or indirectly through a combination system of a top condenser and an absorption chiller to produce cold water, thereby reducing the amount of cooling water used and lowering energy consumption.
It enables the recycling of cooling water, reduces the size and investment cost of cooling towers, lowers energy consumption, and simplifies the system structure under conditions without corrosive materials, further reducing equipment investment.
Smart Images
Figure CN224108378U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to rectification technical field, concretely relates to a rectification tower overhead vapor heat recovery refrigeration water system. BACKGROUND
[0002] Rectification tower is a kind of chemical equipment for separating each component in liquid mixture, and separates based on the boiling point difference between different components. It is widely used in petroleum, chemical industry, pharmaceutical industry and other industries, and is an important equipment for realizing efficient separation.
[0003] Rectification process mainly relies on the volatility (i.e. the tendency to become gas under the same conditions) of each component in the mixture. By heating the mixture, the more volatile components in it are evaporated first, then the vapor is cooled and condensed, so as to realize separation. The whole process is usually completed in a vertical cylindrical tower, and there are several layers of trays or filling materials inside the tower to provide liquid-gas contact area.
[0004] In order to condense the overhead vapor of rectification tower, in the related art, electric heat pump technology is usually used to produce cold water. However, using electric energy to produce cold water consumes a lot of electricity, which increases the operating cost of enterprises and does not achieve the purpose of energy saving. In the rectification operation, a large amount of cooling water is needed to condense the overhead vapor from gas phase to liquid phase. The utility model uses absorption chiller, which can recover the heat to produce cold water, save a lot of cooling water and play a role in energy saving. Therefore, a rectification tower overhead vapor heat recovery refrigeration water system is proposed to meet people's needs. UTILITY MODEL CONTENTS
[0005] To solve the problem of using electric energy to produce cold water for the overhead vapor of rectification tower, the utility model provides a rectification tower overhead vapor heat recovery refrigeration water system, which aims to reduce energy consumption. The specific technical scheme is as follows:
[0006] A rectification tower overhead vapor heat recovery refrigeration water system, comprising a rectification tower, a tower top condenser, a reflux tank, a reflux pump, a hot water circulating pump and an absorption chiller. The top of the rectification tower is connected to the hot side inlet of the tower top condenser through a tower top steam output pipeline. The hot side outlet of the tower top condenser is connected to the rectification tower through a condensate reflux pipeline, and the reflux tank and the reflux pump are arranged in sequence on the condensate reflux pipeline according to the direction of condensate reflux. A condenser circulating water pipeline is arranged on the tower top condenser. The condenser circulating water pipeline comprises a condenser water inlet pipeline connected to the water inlet side of the tower top condenser and a condenser water outlet pipeline connected to the water outlet side of the tower top condenser. The condenser water outlet pipeline is connected to the chiller drive heat source inlet of the absorption chiller, and the condenser water outlet pipeline is connected to the condenser water inlet pipeline from the chiller drive heat source outlet of the absorption chiller. The hot water circulating pump is arranged on the condenser water outlet pipeline.
[0007] The heat side of the overhead condenser is further provided with an overhead non-condensable gas discharge pipeline for discharging overhead non-condensable gas.
[0008] The absorption refrigeration machine is connected with a refrigeration machine circulating water inlet pipeline and a refrigeration machine circulating water return pipeline for internal cooling circulation of the absorption refrigeration machine, and a cold water preparation supply pipeline and a cold water preparation return pipeline for preparation of chilled water.
[0009] A three-way safety valve is arranged at a pipeline position between the hot water circulating pump and the refrigeration machine driving heat source inlet of the absorption refrigeration machine on the condenser water outlet pipeline, and a third port of the three-way safety valve is connected to a condenser water outlet pipeline position between the refrigeration machine driving heat source outlet of the absorption refrigeration machine and the condenser water inlet pipeline through a pipeline.
[0010] Preferably, the two side ports of the three-way safety valve are respectively connected with a pair of butterfly valves, and a butterfly valve is connected in parallel between the outer sides of the pair of butterfly valves.
[0011] Preferably, the third port of the three-way safety valve is connected with a butterfly valve.
[0012] In the utility model, the refrigeration machine circulating water inlet pipeline is provided with a two-way safety valve.
[0013] The three-way safety valve and the two-way safety valve are respectively connected with a controller.
[0014] The process principle of the above-mentioned rectification tower overhead vapor heat recovery chilled water system is as follows:
[0015] The temperature of the overhead vapor is generally above 95°C, and the overhead vapor of the rectifying column is introduced into the overhead condenser to be preliminarily condensed to 10-20°C below the bubble point thereof, and the condensing temperature is generally above 80°C, and the freezing point is generally below 70°C; part of the condensed liquid is returned to the column as reflux, and the non-condensable gas without condensation is discharged, and the material at the cold side inlet of the overhead condenser is 50-70°C cooling water, and the material at the cold side outlet of the overhead condenser is 55-90°C cooling water; the material at the cold side outlet of the overhead condenser is pressurized by a hot water circulating pump and then introduced into an absorption refrigerator for heat recovery, and the outlet is 50-70°C cooling water returned to the first-stage overhead condenser for continued heat exchange. About 8°C cooling water can be produced by the absorption refrigerator using about 25°C cooling water. If the overhead material has no corrosiveness or weak corrosiveness, the overhead vapor can be directly introduced into the absorption refrigerator for heat recovery, and the outlet is 50-70°C condensed liquid partly returned to the rectifying column as reflux, and the remainder is taken as the overhead product. About 8°C cooling water can be produced by the absorption refrigerator using about 25°C cooling water.
[0016] Preferably, the overhead condenser can be a shell-and-tube heat exchanger, or a plate heat exchanger or other types of heat exchanger, and the number of heat exchangers is not limited to one, and the heat exchangers can be connected in series or in parallel.
[0017] Preferably, the water temperature entering the overhead condenser is not limited to 70°C, and is about 70°C during stable operation, and can be lower or higher than 70°C during start-up or adjustment, and the water temperature leaving the overhead condenser is not limited to 90°C, and is about 90°C during stable operation, and can be lower or higher than 90°C during start-up or adjustment.
[0018] Preferably, the water temperature entering the absorption refrigerator is not limited to 90°C, and is about 90°C during stable operation, and can be lower or higher than 90°C during start-up or adjustment, and the water temperature leaving the refrigerator is not limited to 70°C, and is about 70°C during stable operation, and can be lower or higher than 70°C during start-up or adjustment.
[0019] Preferably, a pressure setting point is provided in the pipeline before the hot water circulating pump, and the pressure is about 2-4 kg / cm2, and a safety valve is provided in the pipeline before the pump, and the opening pressure of the safety valve is about 10 kg / cm2, to prevent the pipeline from being damaged due to thermal expansion and cold contraction of water.
[0020] Preferably, an exhaust valve is provided at the top of the water side of the overhead condenser, and is provided at the top of the header when the water flows through the tube side, and is provided at the top of the shell side when the water flows through the shell side, and is provided at the highest point of the water inlet pipeline or the water outlet pipeline when the overhead condenser is lower than the water inlet pipeline or the water outlet pipeline.
[0021] When the overhead material of the rectifying tower is not corrosive or weakly corrosive, another rectifying tower overhead vapor heat recovery refrigerated water system can also be used, and the specific technical scheme is as follows:
[0022] A rectifying tower overhead vapor heat recovery refrigerated water system, comprising a rectifying tower, a reflux tank, a reflux pump and an absorption refrigerating machine; the overhead of the rectifying tower is connected to the refrigerating machine driving heat source inlet of the absorption refrigerating machine through an overhead vapor output pipeline, and the refrigerating machine driving heat source outlet of the absorption refrigerating machine is connected to the rectifying tower through a condensate reflux pipeline, and the reflux tank and the reflux pump are arranged in sequence on the condensate reflux pipeline according to the direction of condensate reflux.
[0023] Among them, the reflux tank is also provided with a tower overhead non-condensable gas discharge pipeline for discharging tower overhead non-condensable gas; a tower overhead product output pipeline is also led out at a pipeline position between the rectifying tower and the reflux pump on the condensate reflux pipeline.
[0024] Among them, the absorption refrigerating machine is connected with a refrigerating machine circulating water inlet pipeline and a refrigerating machine circulating water return pipeline for internal cooling circulation of the absorption refrigerating machine, and a cold water preparation water supply pipeline and a cold water preparation return pipeline for preparing chilled water.
[0025] Among them, a three-way safety valve is arranged at a position close to the refrigerating machine driving heat source inlet of the absorption refrigerating machine on the overhead vapor output pipeline, and the third port of the three-way safety valve is connected to a condensate reflux pipeline position between the refrigerating machine driving heat source outlet of the absorption refrigerating machine and the reflux tank through a pipeline.
[0026] Preferably, the two side ports of the three-way safety valve are respectively connected with a pair of butterfly valves, and a butterfly valve is connected in parallel between the outside of the pair of butterfly valves.
[0027] Preferably, the third port of the three-way safety valve is connected with a butterfly valve.
[0028] Preferably, a two-way safety valve is arranged on the refrigerating machine circulating water inlet pipeline.
[0029] Among them, the three-way safety valve and the two-way safety valve are respectively connected with a controller.
[0030] Under the working condition that the overhead material is not corrosive or weakly corrosive, the rectifying tower overhead vapor heat recovery refrigerated water system does not use a tower overhead condenser, but directly enters the absorption refrigerating machine for heat recovery, and the outlet is 50-70℃ condensate which is returned to the rectifying tower as reflux, and the remaining part is used as the tower overhead product. 25℃ or so cold water can be prepared into 8℃ or so cold water through the absorption refrigerating machine.
[0031] The utility model discloses the beneficial effect is:
[0032] First, the utility model discloses a rectifying tower overhead vapor heat recovery refrigeration water system, cooling water passes through overhead condenser again after the refrigerating machine returns to overhead condenser import, recycling uses, reduces the water volume of return circulation pool, reduces the scale of cooling tower, saves the investment cost of cooling tower system, 70 DEG C or thereabouts cooling water passes through overhead condenser, absorbs the heat, temperature increases, and the overhead vapor heat is recovered to cooling water, becomes hot water, and the 90 DEG C or thereabouts hot water after heat exchange passes through the refrigerating machine, and the refrigerating machine utilizes hot water heat, and the 8 DEG C or thereabouts cold water is prepared, and other systems are used.
[0033] Second, the utility model discloses a rectifying tower overhead vapor heat recovery refrigeration water system, in the working condition that overhead material is not corrosive or corrosive is very weak, system does not use overhead condenser, and overhead steam directly enters absorption type refrigerating machine and carries out heat recovery, and the 50-70 DEG C condensate portion of export is returned to rectifying tower as reflux, and the rest is as overhead product.25 DEG C or thereabouts cooling water passes through absorption type refrigerating machine and can prepare 8 DEG C or thereabouts cold water. This scheme not only reduces energy consumption, and system structure is further simplified, and equipment investment cost is lower. DRAWINGS
[0034] Figure 1 It is one of the structure schematic diagram of the utility model discloses a rectifying tower overhead vapor heat recovery refrigeration water system (sets up overhead condenser).
[0035] Figure 2 It is the structure schematic diagram of the utility model discloses a rectifying tower overhead vapor heat recovery refrigeration water system of second (does not set up overhead condenser).
[0036] Figure 3 It is the internal working principle schematic diagram of absorption type refrigerating machine.
[0037] In the drawing: 1, rectifying tower, 2, overhead condenser, 3, reflux tank, 4, reflux pump, 5, hot water circulating pump, 6, absorption type refrigerating machine, 7, overhead steam output pipeline, 8, the hot side import of overhead condenser, 9, the hot side export of overhead condenser, 10, condensate reflux pipeline, 11, condenser water inlet pipeline, 12, condenser water outlet pipeline, 13, refrigerating machine drive heat source import, 14, refrigerating machine drive heat source export, 15, overhead non-condensable gas discharge pipeline, 16, overhead product output pipeline, 17, refrigerating machine circulating water inlet pipeline, 18, refrigerating machine circulating water return pipeline, 19, cold water preparation water supply pipeline, 20, cold water preparation return pipeline, 21, three-way safety valve, 22, butterfly valve, 23, two-way safety valve, 24, controller. Specific implementation
[0038] The specific embodiments of the present application are further described below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the present application, and cannot be used to limit the protection scope of the present application.
[0039] Example 1
[0040] As Figure 1 shown is an embodiment of a rectifying tower overhead vapor heat recovery refrigeration water system of the present application, comprising a rectifying tower 1, a tower overhead condenser 2, a reflux tank 3, a reflux pump 4, a hot water circulating pump 5 and an absorption type refrigeration machine 6; the overhead of the rectifying tower 1 is connected to the hot side inlet 8 of the tower overhead condenser 2 through an overhead vapor output pipeline 7, the hot side outlet 9 of the tower overhead condenser 2 is connected to the rectifying tower 1 through a condensate reflux pipeline 10, and the reflux tank 3 and the reflux pump 4 are sequentially arranged on the condensate reflux pipeline 10 according to the direction of condensate reflux; a condenser circulating water pipeline is arranged on the tower overhead condenser 2, the condenser circulating water pipeline comprises a condenser water inlet pipeline 11 connected to the water inlet side of the tower overhead condenser 2 and a condenser water outlet pipeline 12 connected to the water outlet side of the tower overhead condenser 2, the condenser water outlet pipeline 12 is connected to the refrigeration machine driving heat source inlet 13 of the absorption type refrigeration machine 6, and the condenser water outlet pipeline 12 is connected to the condenser water inlet pipeline 11 from the refrigeration machine driving heat source outlet 14 of the absorption type refrigeration machine 6, and the hot water circulating pump 5 is arranged on the condenser water outlet pipeline 12.
[0041] Among them, the hot side of the tower overhead condenser 2 is also provided with a tower overhead non-condensable gas discharge pipeline 15 for discharging tower overhead non-condensable gas; a tower overhead product output pipeline 16 is also led out on a pipeline position between the rectifying tower 1 and the reflux pump 4 on the condensate reflux pipeline 10 for outputting tower overhead product.
[0042] Among them, the absorption type refrigeration machine 6 is connected with a refrigeration machine circulating water inlet pipeline 17 and a refrigeration machine circulating water return pipeline 18 for internal cooling circulation of the absorption type refrigeration machine 6, and a cold water preparation water supply pipeline 19 and a cold water preparation return pipeline 20 for preparing chilled water.
[0043] Among them, a three-way safety valve 21 is arranged on a pipeline position between the hot water circulating pump 5 and the refrigeration machine driving heat source inlet 13 of the absorption type refrigeration machine 6 on the condenser water outlet pipeline 12, and a third port of the three-way safety valve 21 is connected to a condenser water outlet pipeline 12 position between the refrigeration machine driving heat source outlet 14 of the absorption type refrigeration machine 6 and the condenser water inlet pipeline 11 through a pipeline.
[0044] Preferably, the two side openings of the three-way safety valve 21 are connected with a pair of butterfly valves 22, and a butterfly valve 22 is connected in parallel between the outer sides of the pair of butterfly valves 22.
[0045] Preferably, the third opening of the three-way safety valve 21 is connected with a butterfly valve 22.
[0046] In the embodiment, the water inlet pipeline 17 of the refrigeration machine is provided with a two-way safety valve 23.
[0047] The three-way safety valve 21 and the two-way safety valve 23 are respectively connected with a controller 24.
[0048] The working process of the rectification tower overhead vapor heat recovery refrigeration water system is as follows:
[0049] The overhead vapor above 95℃ from the rectification tower 1 enters the overhead condenser 2 to be preliminarily condensed, and the condensed liquid enters the reflux tank 3, and is partially refluxed to the tower by the reflux pump 4, and is partially taken as the overhead product. The 70℃ water enters the cold side of the overhead condenser 2 to be heat-exchanged, and the temperature of the water is 90℃ after the heat exchange. The 90℃ hot water is pressurized by the hot water circulating pump 5, and enters the absorption refrigeration machine 6 to recover heat and produce cold water. The outlet of the machine is 70℃ cooling water which returns to the overhead condenser 2 to continue heat exchange. The 25℃ or so cold water after the refrigeration machine is about 8℃ cold water.
[0050] Preferably, the overhead condenser 2 can be a tube-shell heat exchanger, a plate heat exchanger or other types of heat exchangers, and the number of heat exchangers is not limited to one, and can be in series or parallel.
[0051] Preferably, the water temperature entering the overhead condenser 2 is not limited to 70℃, and is about 70℃ during stable operation. During start-up or adjustment, the water temperature can be lower or higher than 70℃. The water temperature out of the overhead condenser is not limited to 90℃, and is about 90℃ during stable operation. During start-up or adjustment, the water temperature can be lower or higher than 90℃.
[0052] Preferably, the water temperature entering the absorption refrigeration machine 6 is not limited to 90℃, and is about 90℃ during stable operation. During start-up or adjustment, the water temperature can be lower or higher than 90℃. The water temperature out of the refrigeration machine is not limited to 70℃, and is about 70℃ during stable operation. During start-up or adjustment, the water temperature can be lower or higher than 70℃.
[0053] Preferably, a pressure point is arranged on the pipeline before the hot water circulating pump 5, and the pressure is about 2 to 4 kg / cm2. A safety valve is arranged on the pipeline before the pump, and the opening pressure of the safety valve is about 10 kg / cm2, to prevent the pipeline from being damaged due to thermal expansion and cold contraction.
[0054] Preferably, the overhead condenser 2 is provided with an exhaust valve at the top of the water side, when the water goes through the tube side, the exhaust valve is arranged at the top of the head, when the water goes through the shell side, the exhaust valve is arranged at the top of the shell side, when the overhead condenser 2 is lower than the water inlet pipeline or the water outlet pipeline, the exhaust valve is arranged at the highest point of the water inlet pipeline or the water outlet pipeline.
[0055] Reference Figure 3 In the technical scheme of the absorption refrigeration machine, the absorption refrigeration follows the Carnot cycle principle, the system uses waste heat as power, the working solution is the absorbent, and water is the refrigerant. The absorption refrigeration mainly comprises the following steps: the waste heat enters the generator to indirectly heat the working solution, the working solution is divided into water vapor and lithium bromide concentrated solution, the water vapor is condensed into liquid state by the condenser, and the two combinations are equivalent to the working solution being subjected to negative pressure rectification; the obtained liquid water enters the evaporator to boil at a low boiling point under high vacuum state, absorbs the heat of the external cold coal, the by-product water vapor enters the absorber to be quickly absorbed by the working concentrated solution, so that the refrigeration cycle is realized, the overhead 95 DEG C vapor from the rectification tower 1 enters the overhead condenser 2 to be preliminarily condensed, the condensed liquid enters the reflux tank 3, part of the liquid is returned to the tower through the reflux pump 4, and the other part is taken as the overhead product; the 70 DEG C water enters the overhead condenser cold side to exchange heat, and the temperature of the hot water is 90 DEG C; the 90 DEG C hot water is pressurized by the hot water circulating pump 5 and enters the absorption refrigeration machine 6 to recover heat and prepare cold water; the outlet is 70 DEG C cooling water which returns to the overhead condenser 2 to continue heat exchange; and the cold water of about 25 DEG C is cooled to about 8 DEG C after the refrigeration machine.
[0056] Embodiment 2
[0057] As Figure 2 Another embodiment of the rectification tower overhead vapor heat recovery refrigeration water system is shown in the utility model, which comprises a rectification tower 1, a reflux tank 3, a reflux pump 4 and an absorption refrigeration machine 6; the overhead of the rectification tower 1 is connected to the refrigeration machine driving heat source inlet 13 of the absorption refrigeration machine 6 through an overhead vapor output pipeline 7, the refrigeration machine driving heat source outlet 14 of the absorption refrigeration machine 6 is connected to the rectification tower 1 through a condensed liquid reflux pipeline 10, and the reflux tank 3 and the reflux pump 4 are sequentially arranged on the condensed liquid reflux pipeline 10 according to the direction of the condensed liquid reflux.
[0058] The reflux tank 3 is further provided with an overhead non-condensable gas discharge pipeline 15 for discharging overhead non-condensable gas; and an overhead product output pipeline 16 is led out from a pipeline position between the rectification tower 1 and the reflux pump 4 on the condensed liquid reflux pipeline 10 for outputting overhead products.
[0059] The absorption chiller 6 is connected to a chiller circulating water inlet pipe 17 and a chiller circulating water return pipe 18 for internal cooling circulation, as well as a cold water production supply pipe 19 and a cold water production return pipe 20 for producing chilled water.
[0060] A three-way safety valve 21 is provided at one end of the vapor output pipeline 7 at the top of the tower near the inlet 13 of the heat source driven by the absorption chiller 6. The third port of the three-way safety valve 21 is connected to a section of condensate return pipeline 10 between the outlet 14 of the heat source driven by the absorption chiller 6 and the return tank 3.
[0061] Preferably, a pair of butterfly valves 22 are connected to the two ports of the three-way safety valve 21, and a butterfly valve 22 is connected in parallel between the outer sides of the pair of butterfly valves 22.
[0062] Preferably, the third port of the three-way safety valve 21 is connected to a butterfly valve 22.
[0063] Preferably, a two-way safety valve 23 is provided on the refrigeration unit circulating water inlet pipe 17.
[0064] The three-way safety valve 21 and the two-way safety valve 23 are respectively connected to the controller 24.
[0065] Under the aforementioned operating conditions where the material at the top of the distillation column is non-corrosive or only mildly corrosive, the distillation column top vapor heat recovery refrigeration water system does not use the top condenser 2. Instead, the top vapor is directly fed into the absorption chiller 6 for heat recovery. A portion of the condensate at the outlet temperature of 50-70℃ is returned to the distillation column 1 as reflux, and the remainder is treated as the top product. Water at approximately 25℃ can be processed by the absorption chiller to produce water at approximately 8℃.
[0066] Absorption refrigeration follows the Carnot cycle principle (see reference). Figure 3 The system uses waste heat as power, a working fluid solution as an absorbent, and water as a refrigerant. It utilizes the characteristic of water boiling at a low boiling point under high vacuum to produce a cold source that meets the needs of production and daily life. The main steps of absorption refrigeration are as follows: waste heat enters the concentrator to indirectly heat the dilute working fluid solution, separating the dilute working fluid solution into water vapor and a concentrated lithium bromide solution. The water vapor is condensed into liquid by the condenser. These two combinations are equivalent to the dilute working fluid solution being distilled under negative pressure. The resulting liquid water enters the evaporator and boils at a low boiling point under high vacuum, absorbing heat from the external refrigerant. The by-product water vapor enters the absorber and is rapidly absorbed by the concentrated working fluid solution, thereby realizing a refrigeration cycle. The remaining features are the same as in Example 1.
[0067] The above merely is the preferred implementation manner of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.
Claims
1. A rectifier overhead vapor heat recovery chilled water system characterized by, The rectifying tower, the overhead condenser, the reflux tank, the reflux pump, the hot water circulating pump and the absorption refrigerating machine are connected; the top of the rectifying tower is connected to the hot side inlet of the overhead condenser through a tower top vapor output pipeline, the hot side outlet of the overhead condenser is connected to the rectifying tower through a condensate reflux pipeline, and the reflux tank and the reflux pump are arranged in sequence on the condensate reflux pipeline according to the direction of condensate reflux; a condenser circulating water pipeline is arranged on the overhead condenser, the condenser circulating water pipeline comprises a condenser water inlet pipeline connected to the water inlet side of the overhead condenser and a condenser water outlet pipeline connected to the water outlet side of the overhead condenser, the condenser water outlet pipeline is connected to the refrigerating machine driving heat source inlet of the absorption refrigerating machine, and the condenser water outlet pipeline is connected to the refrigerating machine driving heat source outlet of the absorption refrigerating machine; the hot water circulating pump is arranged on the condenser water outlet pipeline.
2. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 1 wherein, The hot side of the overhead condenser is further provided with a tower overhead non-condensable gas discharge pipeline for discharging tower overhead non-condensable gas; a tower overhead product output pipeline is further led out at a pipeline position between the rectifying tower and the reflux pump on the condensate reflux pipeline.
3. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 1 wherein, The absorption refrigerating machine is connected with a refrigerating machine circulating water inlet pipeline and a refrigerating machine circulating water return pipeline for internal cooling circulation of the absorption refrigerating machine, and a cold water preparation water supply pipeline and a cold water preparation return pipeline for preparation of chilled water.
4. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 1 wherein, A three-way safety valve is arranged at a pipeline position between the hot water circulating pump and the refrigerating machine driving heat source inlet of the absorption refrigerating machine on the condenser water outlet pipeline, and a third port of the three-way safety valve is connected to a condenser water outlet pipeline position between the refrigerating machine driving heat source outlet of the absorption refrigerating machine and the condenser water inlet pipeline through a pipeline.
5. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 3 wherein, A two-way safety valve is arranged on the refrigerating machine circulating water inlet pipeline.
6. A rectifier overhead vapor heat recovery chilled water system characterized by, The rectifying tower, the reflux tank, the reflux pump and the absorption refrigerating machine are connected; the top of the rectifying tower is connected to the refrigerating machine driving heat source inlet of the absorption refrigerating machine through a tower top vapor output pipeline, the refrigerating machine driving heat source outlet of the absorption refrigerating machine is connected to the rectifying tower through a condensate reflux pipeline, and the reflux tank and the reflux pump are arranged in sequence on the condensate reflux pipeline according to the direction of condensate reflux.
7. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 6 wherein, The reflux tank is further provided with a tower overhead non-condensable gas discharge pipeline for discharging tower overhead non-condensable gas; a tower overhead product output pipeline is further led out at a pipeline position between the rectifying tower and the reflux pump on the condensate reflux pipeline.
8. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 6 wherein, The absorption refrigerating machine is connected with a refrigerating machine circulating water inlet pipeline and a refrigerating machine circulating water return pipeline for internal cooling circulation of the absorption refrigerating machine, and a cold water preparation water supply pipeline and a cold water preparation return pipeline for preparation of chilled water.
9. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 6 wherein, A three-way safety valve is arranged on the tower top vapor output pipeline at a position close to the refrigeration driving heat source inlet of the absorption refrigeration machine, and a third port of the three-way safety valve is connected to a position of a condensate return pipeline between the refrigeration driving heat source outlet of the absorption refrigeration machine and the reflux tank through a pipeline.
10. A rectifier overhead vapor heat recovery chilled water system as set forth in claim 6 wherein, A two-way safety valve is arranged on the refrigeration machine circulating water inlet pipeline.