CN114623429A - Micro-pressure steam recovery system and method - Google Patents
Micro-pressure steam recovery system and method Download PDFInfo
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- CN114623429A CN114623429A CN202210285155.9A CN202210285155A CN114623429A CN 114623429 A CN114623429 A CN 114623429A CN 202210285155 A CN202210285155 A CN 202210285155A CN 114623429 A CN114623429 A CN 114623429A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
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Abstract
The invention discloses a micro-pressure steam recovery system and a method, wherein the system comprises a process steam pipe network, a centrifugal compressor system, a plurality of heat pump systems and a water vapor compressor system, wherein the centrifugal compressor system obtains first micro-pressure steam according to input waste heat steam to generate process steam transmitted to the process steam pipe network; the heat pump system generates superheated water which is transmitted to the water vapor compressor system according to the input residual heat water; the water vapor compressor system obtains second micro-pressure steam according to input superheated water, and process steam used for being transmitted to the process steam pipe network is generated. The invention improves the utilization rate of the micro-pressure steam by arranging the regulating pipeline for supplementing the micro-pressure steam to the centrifugal compressor system by the steam compressor system and adopting a high-temperature steam heat pump combined regulation method, greatly widens the allowable operation range of the steam compressor to the inlet flow, ensures that the efficiency of the centrifugal steam compressor is in the optimal energy efficiency in real time, and also improves the whole steam output of the system.
Description
Technical Field
The invention relates to the technical field of micro-pressure steam recycling, in particular to a micro-pressure steam recycling system and method.
Background
In the past, for waste heat micro-pressure steam, such as hot water/superheated water used for cooling a chemical reaction kettle, heat is taken away and discharged into the atmosphere by a method of vaporizing water into steam, and a centrifugal water-vapor compressor is usually adopted to compress, heat and pressure to meet the steam taste requirement at a process point in consideration of large waste heat recycling amount of the part. However, the centrifugal compressor has a narrow allowable range for inlet flow fluctuation and a narrow adjustment range, and a user usually cannot accurately provide micro-pressure steam flow, or the micro-pressure steam flow fluctuation is large during subsequent operation and easily exceeds the adjustable range of the centrifugal steam compressor.
Therefore, how to enlarge the operation range and the operation efficiency of the centrifugal compressor to improve the overall efficiency of the waste heat micro-pressure steam recovery system and the safe operation margin of the system is a technical problem which needs to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a micro-pressure steam recovery system, and aims to solve the technical problems that the overall efficiency of a waste heat micro-pressure steam recovery system and the safe operation margin of the system are not high due to the limited operation range and low efficiency of the conventional centrifugal compressor.
To achieve the above object, the present invention provides a micro-pressure vapor recovery system, comprising:
a process steam pipe network;
the centrifugal compressor system is used for obtaining first micro-pressure steam according to input waste heat steam and generating process steam for transmitting to the process steam pipe network by utilizing the first micro-pressure steam;
the heat pump systems are used for generating superheated water for being transmitted to the water vapor compressor system according to input waste heat water;
the water vapor compressor system is used for obtaining second micro-pressure steam according to input superheated water and generating process steam for transmitting to the process steam pipe network by utilizing the second micro-pressure steam;
and a micro-pressure steam regulating pipeline for supplementing micro-pressure steam to the centrifugal compressor system is arranged between the water vapor compressor system and the centrifugal compressor system.
Optionally, the centrifugal compressor system includes a pressure stabilizer and a centrifugal compressor, an input end of the pressure stabilizer is connected to the waste heat steam input pipeline, an output end of the pressure stabilizer is connected to an input end of the centrifugal compressor, and an output end of the centrifugal compressor is connected to an input end of the process steam pipe network.
Optionally, a first steam four-way valve is arranged between the pressure stabilizing device and the centrifugal compressor, a first end of the first steam four-way valve is connected to the output end of the pressure stabilizing device, a second end of the first steam four-way valve is connected to the input end of the centrifugal compressor, a third end of the first steam four-way valve is connected to the output end of the micro-pressure steam regulating pipeline, and a fourth end of the first steam four-way valve is connected to the output end of the centrifugal compressor.
Optionally, a check valve is arranged between the pressure stabilizing device and the first steam four-way valve, so that micro-pressure steam of the first steam four-way valve is prevented from flowing back to the pressure stabilizing device.
Optionally, the first input end of the heat pump system is connected with a waste heat water input pipeline, the second input end of the heat pump system is connected with a water source input pipeline, the first output end of the heat pump system is connected with a waste heat water output pipeline, and the second output end of the heat pump system is connected with the input end of the superheated water transmission pipeline.
Optionally, the steam compressor system comprises a flash evaporation device and a steam compressor, an input end of the flash evaporation device is connected with an output end of the superheated water transmission pipeline, an output end of the flash evaporation device is connected with an input end of the steam compressor, and an output end of the steam compressor is connected with an input end of the process steam pipe network.
Optionally, a second steam four-way valve is arranged between the flash evaporation equipment and the steam compressor, a first end of the second steam four-way valve is connected with an output end of the flash evaporation equipment, a second end of the second steam four-way valve is connected with an input end of the steam compressor, a third end of the second steam four-way valve is connected with an input end of a micro-pressure steam regulating pipeline, and a fourth end of the second steam four-way valve is connected with an input end of a process steam pipe network.
Optionally, a first steam three-way valve is arranged between the second steam four-way valve and the steam compressor, a first end of the first steam three-way valve is connected with a second end of the second steam four-way valve, a second end of the first steam three-way valve is connected with an input end of the steam compressor, and a third end of the first steam three-way valve is connected with a process steam pipe network.
Optionally, the centrifugal compressor system and the steam compressor system are respectively provided with a second steam three-way valve, a first end of the second steam three-way valve is connected to a process steam output end of the centrifugal compressor system or the steam compressor system, a second end of the second steam three-way valve is connected to a first process steam pipe network, and a third end of the second steam three-way valve is connected to a second process steam pipe network; the first process steam pipe network and the second process steam pipe network are process steam pipe networks of steam with different temperatures.
In addition, in order to achieve the above object, the present invention also provides a minute-pressure steam recovery method for a minute-pressure steam recovery system as described above, the method comprising the steps of:
when the inlet flow of the input waste heat steam of the centrifugal compressor system exceeds Nt/h: the centrifugal compressor system obtains first micro-pressure steam according to input waste heat steam, and the first micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; the water vapor compressor system obtains second micro-pressure steam according to input superheated water, and the second micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; wherein N is a standard flow value of the operation of the centrifugal compressor system;
when the inlet flow of the waste heat steam input by the centrifugal compressor system is between (N-N) t/h and Nt/h: the centrifugal compressor system generates process steam for transmitting to the process steam pipe network according to first micro-pressure steam obtained by input waste heat steam and part of second micro-pressure steam supplemented by the water vapor compressor system; the water vapor compressor system obtains the remaining second micro-pressure steam according to the input superheated water, and the remaining second micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; the sum of the flow rates of the first micro-pressure steam and the second micro-pressure steam is Nt/h, and n is a standard flow rate value of the operation of the water vapor compressor system;
when the inlet flow of the waste heat steam input by the centrifugal compressor system is between (kN-N) t/h and (N-N) t/h: the centrifugal compressor system generates process steam for transmitting to the process steam pipe network according to first micro-pressure steam obtained by input waste heat steam and all second micro-pressure steam supplemented by the water vapor compressor system; wherein: k is the ratio of the minimum flow value and the standard flow value of the centrifugal compressor system which can stably operate only through frequency conversion adjustment.
The invention provides a micro-pressure steam recovery system which comprises a process steam pipe network, a centrifugal compressor system, a plurality of heat pump systems and a water vapor compressor system, wherein the centrifugal compressor system obtains first micro-pressure steam according to input waste heat steam and generates process steam which is transmitted to the process steam pipe network; the plurality of heat pump systems generate superheated water which is transmitted to the water vapor compressor system according to the input residual heat water; the water vapor compressor system obtains second micro-pressure steam according to the input superheated water and generates process steam for transmission to a process steam pipe network. The invention improves the utilization rate of the micro-pressure steam by arranging the micro-pressure steam adjusting pipeline for supplementing the micro-pressure steam to the centrifugal compressor system by the water vapor compressor system and adopting a high-temperature steam heat pump combined adjusting method, greatly widens the allowable operation range of the water vapor compressor to the inlet flow, ensures that the efficiency of the centrifugal water vapor compressor is in the optimal energy efficiency in real time, and also improves the overall steam output of the system.
Drawings
Fig. 1 is a schematic structural diagram of a micro-pressure vapor recovery system according to an embodiment of the present invention.
The reference numbers indicate:
1-a heat pump system; 2-flash evaporation equipment; 3-a first pipeline; 4-a micropressure steam regulating pipeline; 5-a second four-way valve; 6-a second pipeline; 7-a water vapor compressor; 8-a third pipeline; 9-voltage stabilizing equipment; 10-a fourth pipeline; 11-a non-return valve; 12-a first four-way valve; 13-a fifth pipeline; 14-a centrifugal compressor; 15-a second three-way valve a; 16-a sixth pipeline; 17-a seventh conduit; 18-a second three-way valve B; 19-eighth conduit; 20-a ninth conduit; 30-a first three-way valve; 31-tenth pipe.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
In the past, for waste heat micro-pressure steam, such as hot water/superheated water used for cooling a chemical reaction kettle, heat is taken away and discharged into the atmosphere by a method of vaporizing water into steam, and a centrifugal water-vapor compressor is usually adopted to compress, heat and pressure to meet the steam taste requirement at a process point in consideration of large waste heat recycling amount of the part. However, the centrifugal compressor has a narrow allowable range for inlet flow fluctuation and a narrow adjustment range, and a user usually cannot accurately provide micro-pressure steam flow, or the micro-pressure steam flow fluctuation is large during subsequent operation and easily exceeds the adjustable range of the centrifugal steam compressor.
Therefore, how to enlarge the operation range and the operation efficiency of the centrifugal compressor to improve the overall efficiency of the waste heat micro-pressure steam recovery system and the safe operation margin of the system is a technical problem which needs to be solved urgently.
To address this problem, various embodiments of the micropressure vapor recovery system of the invention are proposed. The micro-pressure steam recovery system provided by the invention has the advantages that the micro-pressure steam regulating pipeline for supplementing micro-pressure steam to the centrifugal compressor system by the steam compressor system is arranged, and a high-temperature steam heat pump combined regulation method is adopted, so that the utilization rate of the micro-pressure steam is improved, the allowable operation range of the steam compressor on the inlet flow is greatly widened, the efficiency of the centrifugal steam compressor is in the optimal energy efficiency in real time, and the whole steam output of the system is also improved.
An embodiment of the present invention provides a micro-pressure vapor recovery system, and referring to fig. 1, fig. 1 is a schematic structural diagram of the micro-pressure vapor recovery system of the present invention.
In this embodiment, the micro-pressure steam recovery system includes a process steam pipe network, a centrifugal compressor system, a plurality of heat pump systems, and a steam compressor system.
Specifically, the centrifugal compressor system is used for obtaining first micro-pressure steam according to input waste heat steam and generating process steam for transmitting to the process steam pipe network by utilizing the first micro-pressure steam; the heat pump systems are used for generating superheated water for being transmitted to the water vapor compressor system according to input waste heat water; the water vapor compressor system is used for obtaining second micro-pressure steam according to input superheated water, and the second micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network.
A micro-pressure steam regulating pipeline for supplementing micro-pressure steam to the centrifugal compressor system is arranged between the water vapor compressor system and the centrifugal compressor system.
In this embodiment, the water vapor compressor system is usually a small-capacity compressor system, the centrifugal compressor system is usually a large-capacity compressor system, the steam waste heat is recovered by using the large-capacity centrifugal compressor system, and when the micro-pressure steam of the heat source is insufficient, the micro-pressure steam is generated by using the heat pump and is supplemented by the small-capacity compressor system, so as to achieve the optimal efficiency and energy efficiency of the centrifugal compressor.
In one embodiment, the centrifugal compressor system comprises a pressure stabilizer and a centrifugal compressor, wherein the input end of the pressure stabilizer is connected with the waste heat steam input pipeline, the output end of the pressure stabilizer is connected with the input end of the centrifugal compressor, and the output end of the centrifugal compressor is connected with the input end of the process steam pipe network.
Furthermore, a first steam four-way valve is arranged between the pressure stabilizing equipment and the centrifugal compressor, the first end of the first steam four-way valve is connected with the output end of the pressure stabilizing equipment, the second end of the first steam four-way valve is connected with the input end of the centrifugal compressor, the third end of the first steam four-way valve is connected with the output end of the micro-pressure steam adjusting pipeline, and the fourth end of the first steam four-way valve is connected with the output end of the centrifugal compressor.
Meanwhile, a check valve is arranged between the pressure stabilizing equipment and the first steam four-way valve, so that micro-pressure steam of the first steam four-way valve is prevented from flowing back to the pressure stabilizing equipment.
In another embodiment, a first input end of the heat pump system is connected with a waste heat water input pipeline, a second input end of the heat pump system is connected with a water source input pipeline, a first output end of the heat pump system is connected with a waste heat water output pipeline, and a second output end of the heat pump system is connected with an input end of a superheated water conveying pipeline.
Particularly, the heat pump system can be a large-capacity single unit or a plurality of modularized small-capacity units, the heat pump system can be arranged according to the field waste heat distribution condition of a user, and when the plurality of small-capacity heat pump units operate, superheated water outlets of the heat pump systems can be combined and then enter a flash tank, so that the cost is reduced; or flash distillation can be carried out independently, and subsequent steam is combined.
In a preferred embodiment, when a plurality of small-capacity heat pump units are operated and used for adjusting the inlet flow of the water vapor compressor, the small-capacity heat pump units can be switched in one by one to reduce the load of the screw water vapor compressor.
The heat source of the heat pump system may be an air source, a waste heat water source, a waste water heat source, a geothermal source, or the like, which is not limited in this embodiment.
Furthermore, the water vapor compressor system comprises a flash evaporation device and a water vapor compressor, wherein the input end of the flash evaporation device is connected with the output end of the superheated water transmission pipeline, the output end of the flash evaporation device is connected with the input end of the water vapor compressor, and the output end of the water vapor compressor is connected with the input end of the process steam pipe network.
The small-capacity vapor compressor matched with the heat pump system can be a screw-type vapor compressor, a roots-type vapor compressor and a centrifugal vapor compressor, and is determined by the regulation demand range, and the screw-type vapor compressor is preferentially adopted in the case of large regulation range.
In the preferred embodiment, the waste heat water is prepared into superheated water by adopting a heat pump, steam is generated by flash evaporation, the capacity is small, wide-range stepless regulation is required, and the waste heat water is suitable for being matched with a screw type water vapor compressor.
Specifically, the capacity of the screw type water vapor compressor should be matched with the steam capacity of all heat pumps at 100 ℃, and a single large-capacity unit is used as far as possible.
Meanwhile, a second steam four-way valve is arranged between the flash evaporation equipment and the steam compressor, the first end of the second steam four-way valve is connected with the output end of the flash evaporation equipment, the second end of the second steam four-way valve is connected with the input end of the steam compressor, the third end of the second steam four-way valve is connected with the input end of the micro-pressure steam regulating pipeline, and the fourth end of the second steam four-way valve is connected with the input end of the process steam pipe network.
In the embodiment, the centrifugal compressor system and the water vapor compressor system are respectively provided with the micro-pressure steam adjusting pipeline and the first steam four-way valve and the second steam four-way valve which are connected with the micro-pressure steam adjusting pipeline, so that the water vapor compressor system can supplement micro-pressure steam to the centrifugal compressor system.
The waste heat water is utilized, a heat pump system is adopted, and the waste heat water is preferentially used for adjusting the inlet flow of the centrifugal water vapor compressor, so that the rated working condition operation range of the water vapor compressor is greatly widened, and the system efficiency is high.
It should be noted that, the water vapor compressor system and the centrifugal compressor system in this embodiment respectively recover the waste heat water and the waste heat vapor, the two systems can operate independently, and the heat pump system can also operate in a matching manner when the micro-pressure vapor load fluctuates.
In still another embodiment, a first steam three-way valve is arranged between the second steam four-way valve and the steam compressor, a first end of the first steam three-way valve is connected with a second end of the second steam four-way valve, a second end of the first steam three-way valve is connected with an input end of the steam compressor, and a third end of the first steam three-way valve is connected with a process steam pipe network.
It is easy to understand, first steam three-way valve is used for when the superheated water that heat pump system produced is a little higher than the demand of technology steam pipe network, can directly carry the micropressure steam of flash distillation device output to technology steam pipe network through the three-way valve, and need not to pass through vapor compressor.
In a further embodiment, the centrifugal compressor system and the water vapor compressor system are respectively provided with a second steam three-way valve, a first end of the second steam three-way valve is connected with a process steam output end of the centrifugal compressor system or the water vapor compressor system, a second end of the second steam three-way valve is connected with a first process steam pipe network, and a third end of the second steam three-way valve is connected with a second process steam pipe network; the first process steam pipe network and the second process steam pipe network are process steam pipe networks of steam with different temperatures.
It is easy to understand, when the technology steam pipe net is equipped with different steam temperature index, the accessible sets up the three-way valve behind centrifugal compressor and vapor compressor and carries the micropressure steam to different technology steam pipe nets to satisfy the requirement of different temperature steam. The embodiment can fully utilize all the waste heat steam through the arrangement, and no waste exists; the residual heat water is utilized as much as possible, and the utilization rate is high; the water vapor compressor system is safe, stable and efficient to operate.
It should be noted that, the valves used in this embodiment all adopt electromagnetic valves, and the flow rate can be remotely adjusted.
In this embodiment, a combined waste heat recovery method is provided, in which a centrifugal water vapor compressor is used to recover steam waste heat, and when the micro-pressure steam of the heat source is insufficient, a heat pump is used to generate micro-pressure steam for supplement, so as to achieve the optimal efficiency and energy efficiency of the centrifugal water vapor compressor. The heat pump system extracts heat from waste hot water to generate superheated water, the superheated water is used for preparing steam through flash evaporation, meanwhile, a set of small-sized steam compressor (which is characterized by wide adjusting range and far smaller capacity than that of a centrifugal steam compressor) is arranged, the temperature/pressure of steam at the outlet of the heat pump and the small-sized steam compressor is adjusted according to the system requirement, the centrifugal steam compressor is adjusted by the heat pump system, and the overall efficiency of the system and the safe operation margin of the system can be greatly improved.
For the convenience of understanding, the present embodiment provides a specific example of the recovery of the micro-pressure steam by using the micro-pressure steam recovery system, which is as follows:
the embodiment is applied to the field of comprehensive waste heat recovery of waste heat water and waste heat micro-pressure/negative pressure steam, in particular to the field of waste heat recovery of the waste heat micro-pressure/negative pressure steam. In the waste heat recovery process, the heat of waste heat water is recovered through a heat pump system, and waste heat steam is recovered through a steam compressor. Because the heat in the waste heat water is sensible heat and the heat value is lower, the steam flow which can be generated is not large, the heat is extracted by adopting a heat pump to generate steam, and the steam flow of the waste heat micro-pressure steam is large, so that a centrifugal steam compressor unit is adopted.
The waste heat resources at the user place comprise a large amount of waste heat and waste water and a large amount of micro-pressure steam (about T0, such as 100 ℃); the user demands are (above T0) T1 and T2 grades of saturated steam (T1 > T2), such as T1 grade (135 ℃) and T2 grade (120 ℃).
The embodiment preferentially utilizes the residual heat energy to prepare T1 saturated steam, and can supply the T2 pipe network under the condition of excessive residual heat. The residual hot water is prepared into superheated water by a heat pump, steam is generated by flash evaporation, the amount of the steam generated by flash evaporation is small, nt/h can be obtained by calculation, and the capacity is small. Meanwhile, the small-capacity vapor compressor can meet wide-range stepless regulation and is suitable for being matched with a screw type vapor compressor; a centrifugal water vapor compressor is used for a large amount of micro-pressure steam.
Specifically, the method for recovering the micro-pressure steam by using the micro-pressure steam recovery system comprises the following steps:
when the inlet flow of the input waste heat steam of the centrifugal compressor system exceeds Nt/h: the centrifugal compressor system obtains first micro-pressure steam according to input waste heat steam, and the first micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; the water vapor compressor system obtains second micro-pressure steam according to input superheated water, and the second micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; wherein N is a standard flow value of the operation of the centrifugal compressor system;
when the inlet flow of the waste heat steam input by the centrifugal compressor system is between (N-N) t/h and Nt/h: the centrifugal compressor system generates process steam for transmitting to the process steam pipe network according to first micro-pressure steam obtained by input waste heat steam and part of second micro-pressure steam supplemented by the water vapor compressor system; the water vapor compressor system obtains the remaining second micro-pressure steam according to the input superheated water, and the remaining second micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; the sum of the flow rates of the first micro-pressure steam and the second micro-pressure steam is Nt/h, and n is a standard flow rate value of the operation of the water vapor compressor system;
when the inlet flow of the waste heat steam input by the centrifugal compressor system is between (kN-N) t/h and (N-N) t/h: the centrifugal compressor system generates process steam for transmitting to the process steam pipe network according to first micro-pressure steam obtained by input waste heat steam and all second micro-pressure steam supplemented by the water vapor compressor system; wherein: k is the ratio of the minimum flow value and the standard flow value of the centrifugal compressor system which can stably operate only through frequency conversion adjustment.
As can be easily understood, when the inlet flow rate of the waste heat steam can reach N T/h, the waste heat steam enters the fourth pipeline 10 through the pressure stabilizing device 9, passes through the check valve 11, the first four-way valve 12 cuts off the micro-pressure steam adjusting pipeline 4 and the fifth pipeline 13, only the fourth pipeline 10 and the centrifugal compressor 14 are connected, and the water steam outlet temperature T1 is directly connected to a T1 pipe network;
utilization of residual heat water:
the method A comprises the following steps: through the heat pump system 1, superheated water enters the flash evaporation equipment 2 to generate saturated steam with the temperature of T2, the saturated steam is connected to the steam compressor 7 through the first pipeline 3, at the moment, the second four-way valve 5 arranged in the pipeline is connected with the first pipeline 3 and the second pipeline 6, the micro-pressure steam adjusting pipeline 4 and the seventh pipeline 17 are disconnected, the T1 saturated steam at the outlet of the steam compressor 7 passes through the third pipeline 8, the second three-way valve B18 is controlled to be connected with the third pipeline 8 and the ninth pipeline 20, the eighth pipeline 19 is disconnected, and the T1 process steam pipe network is connected; similarly, the second three-way valve a15 may be controlled to connect to the T2 process steam pipe network via the sixth line 16.
The method B comprises the following steps: the heat pump system directly generates superheated water slightly higher than the temperature of T1, the superheated water flashes T1 temperature steam in the flash evaporation equipment 2, and the superheated water enters a T1 steam pipe network through the first pipeline 3, the second four-way valve 5, the second pipeline 6, the first three-way valve 30 and the tenth pipeline 31, so that the water vapor compressor 7 can be omitted, and the efficiency is improved.
The selection of the method A and the method B is mainly based on the comparison of the capacity of a heat pump and the overall efficiency of a heat pump and steam compressor system, and the selection is preferred.
At the moment, the waste heat steam utilization system and the waste heat water utilization system are mutually independent, the waste heat steam system is in a rated working condition, the efficiency is highest, meanwhile, the waste heat water utilization system is provided with a preferred selection mode, and the efficiency of the heat pump system is also highest at the moment; in normal operation, the fifth line 13 is in a disconnected or no-flow condition.
When the quantity of the waste heat steam is (N-N) -N t/h, the heat pump system supplements the inlet steam to the waste heat steam system. The waste heat water passes through the heat pump system 1, the superheated water enters the flash evaporation equipment 2 to generate saturated steam with the temperature of T0, the sum of the steam flow in the micro-pressure steam adjusting pipeline 4 and the steam flow in the fourth pipeline 10 reaches N T/h by controlling the second four-way adjusting valve 5, the first four-way adjusting valve 12, closing the seventh pipeline 17 and adjusting the T0 steam flow of the micro-pressure steam adjusting pipeline 4 and the second pipeline 6, at the moment, the centrifugal compressor 14 always keeps the highest efficiency under the condition of complete utilization of the waste heat steam, and meanwhile, the load of the water vapor compressor 7 is reduced, so that the energy consumption of the whole system is reduced.
When the flow rate of the waste heat steam inlet is reduced to (0.9N-N) - (N-N) T/h, the second pipeline 6 and the seventh pipeline 17 are closed through the second four-way valve 5, the steam of the heat pump system T0 is completely introduced into the micro-pressure steam adjusting pipeline 4 and enters the inlet of the centrifugal water steam compressor 14, meanwhile, the compressor can adjust the flow rate of the compressor inlet through frequency conversion, at the moment, the efficiency of the centrifugal compressor 14 is still high, meanwhile, the water steam compressor 7 in the waste heat water utilization system completely exits the system, and the energy consumption of the whole heat recovery combined utilization system is low.
Under the above three operating modes, the system efficiency is highest, and waste heat utilization rate is highest. And the system joint operation enables the high-efficiency operation load of the centrifugal compressor to be greatly widened, the adjustment range proportion is increased from 90 percent to 100 percent (0.9- (100N/N)% ] -100 percent), and the adjustment range proportion can reach 54 percent to 100 percent through example calculation.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A micro-pressure vapor recovery system, the system comprising:
a process steam pipe network;
the centrifugal compressor system is used for obtaining first micro-pressure steam according to input waste heat steam and generating process steam for transmitting to the process steam pipe network by utilizing the first micro-pressure steam;
the heat pump systems are used for generating superheated water for being transmitted to the water vapor compressor system according to input waste heat water;
the water vapor compressor system is used for obtaining second micro-pressure steam according to input superheated water and generating process steam for transmitting to the process steam pipe network by utilizing the second micro-pressure steam;
and a micro-pressure steam adjusting pipeline for supplementing micro-pressure steam to the centrifugal compressor system is arranged between the water vapor compressor system and the centrifugal compressor system.
2. The micro-pressure vapor recovery system of claim 1, wherein the centrifugal compressor system comprises a pressure stabilizer and a centrifugal compressor, wherein an input end of the pressure stabilizer is connected with the waste heat vapor input pipeline, an output end of the pressure stabilizer is connected with an input end of the centrifugal compressor, and an output end of the centrifugal compressor is connected with an input end of the process vapor pipe network.
3. The micro-pressure steam recovery system according to claim 2, wherein a first steam four-way valve is disposed between the pressure stabilizer and the centrifugal compressor, a first end of the first steam four-way valve is connected to an output end of the pressure stabilizer, a second end of the first steam four-way valve is connected to an input end of the centrifugal compressor, a third end of the first steam four-way valve is connected to an output end of the micro-pressure steam regulating pipeline, and a fourth end of the first steam four-way valve is connected to an output end of the centrifugal compressor.
4. The micro-pressure steam recovery system of claim 3, wherein a check valve is disposed between the pressure stabilizer and the first steam four-way valve to prevent micro-pressure steam of the first steam four-way valve from flowing back to the pressure stabilizer.
5. The micro-pressure vapor recovery system of claim 1, wherein the first input of the heat pump system is connected to a waste heat water input line, the second input of the heat pump system is connected to a water source input line, the first output of the heat pump system is connected to a waste heat water output line, and the second output of the heat pump system is connected to an input of a superheated water transfer line.
6. The micropressure steam recovery system according to claim 5, wherein the steam compressor system comprises a flash device and a steam compressor, wherein the input end of the flash device is connected with the output end of the superheated water transmission pipeline, the output end of the flash device is connected with the input end of the steam compressor, and the output end of the steam compressor is connected with the input end of a process steam pipe network.
7. The micro-pressure steam recovery system as claimed in claim 1, wherein a second steam four-way valve is provided between the flash evaporation device and the steam compressor, a first end of the second steam four-way valve is connected to an output end of the flash evaporation device, a second end of the second steam four-way valve is connected to an input end of the steam compressor, a third end of the second steam four-way valve is connected to an input end of the micro-pressure steam regulating pipeline, and a fourth end of the second steam four-way valve is connected to an input end of the process steam pipe network.
8. The micro-pressure steam recovery system of claim 1, wherein a first steam three-way valve is disposed between the second steam four-way valve and the steam compressor, a first end of the first steam three-way valve is connected to a second end of the second steam four-way valve, a second end of the first steam three-way valve is connected to an input end of the steam compressor, and a third end of the first steam three-way valve is connected to a process steam pipe network.
9. The micropressure steam recovery system according to claim 1, wherein the centrifugal compressor system and the steam compressor system are respectively provided with a second steam three-way valve, a first end of the second steam three-way valve is connected with a process steam output end of the centrifugal compressor system or the steam compressor system, a second end of the second steam three-way valve is connected with a first process steam pipe network, and a third end of the second steam three-way valve is connected with a second process steam pipe network; the first process steam pipe network and the second process steam pipe network are process steam pipe networks of steam with different temperatures.
10. A micro-pressure vapor recovery method for use in the micro-pressure vapor recovery system of any one of claims 1-9, the method comprising the steps of:
when the inlet flow of the input waste heat steam of the centrifugal compressor system exceeds Nt/h: the centrifugal compressor system obtains first micro-pressure steam according to input waste heat steam, and the first micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; the water vapor compressor system obtains second micro-pressure steam according to input superheated water, and the second micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; wherein N is a standard flow value of the operation of the centrifugal compressor system;
when the inlet flow of the waste heat steam input by the centrifugal compressor system is between (N-N) t/h and Nt/h: the centrifugal compressor system generates process steam for transmitting to the process steam pipe network according to first micro-pressure steam obtained by input waste heat steam and part of second micro-pressure steam supplemented by the water vapor compressor system; the water vapor compressor system obtains the remaining second micro-pressure steam according to the input superheated water, and the remaining second micro-pressure steam is utilized to generate process steam for being transmitted to the process steam pipe network; the sum of the flow rates of the first micro-pressure steam and the second micro-pressure steam is Nt/h, and n is a standard flow rate value of the operation of the water vapor compressor system;
when the inlet flow of the waste heat steam input by the centrifugal compressor system is between (kN-N) t/h and (N-N) t/h: the centrifugal compressor system generates process steam for transmitting to the process steam pipe network according to first micro-pressure steam obtained by input waste heat steam and all second micro-pressure steam supplemented by the water vapor compressor system; wherein: k is the ratio of the minimum flow value and the standard flow value of the centrifugal compressor system which can stably operate only through frequency conversion adjustment.
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