CN218166001U - Improved generation rectifying column waste heat utilization system based on second class heat pump - Google Patents
Improved generation rectifying column waste heat utilization system based on second class heat pump Download PDFInfo
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- CN218166001U CN218166001U CN202221519387.8U CN202221519387U CN218166001U CN 218166001 U CN218166001 U CN 218166001U CN 202221519387 U CN202221519387 U CN 202221519387U CN 218166001 U CN218166001 U CN 218166001U
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Abstract
The utility model discloses an improved generation rectifying column waste heat utilization system based on class II heat pump, including the rectifying column, set up the top of the tower steam output pipeline at the rectifying column top, set up the tower cauldron liquid heating cycle pipeline at the rectifying column bottom to and be used for carrying out the heat recovery conversion system based on class II heat pump of utilizing to the steam waste heat of top of the tower steam output pipeline output, heat recovery conversion system includes concentrator, condenser, heat taker and heater, is connected with cooling water circulation pipeline on the condenser of heat recovery conversion system; the tower top steam output pipeline comprises a first tower top steam branch pipe which is connected with the heat energy recovery conversion system and exchanges heat with a concentrator of the heat energy recovery conversion system, and the tower bottom heating circulation pipeline is connected with the heat energy recovery conversion system and forms a heating circulation loop with a heater of the heat energy recovery conversion system. The utility model discloses can reduce the consumption of steam consumption and refrigeration cycle water, reduce the running cost.
Description
Technical Field
The utility model relates to a rectification technology field, concretely relates to improved generation rectifying column waste heat utilization system based on class II heat pump.
Background
The rectifying tower is also called a fractionating tower, a refining tower and the like, is mainly used for fractionating methyl ethyl ketone, sec-butyl acetate, isopropyl acetate, methyl acetate, tetrahydrofuran, ethanol, ethylene glycol, butanol, n-butanol, butanediol, 1, 4-butynediol, cyclohexanol, benzene, cyclohexene and the like, and is a device for purifying and recycling in the chemical production process of a factory. When the rectifying tower works, tower bottom liquid of the rectifying tower is heated by steam, tower top steam output from the tower top is condensed into a liquid phase through a condenser (circulating water or air is used as a cold source), and heavy component kettle liquid is a purified product. The original steam flow control mode is as follows: the flow rate of the steam is controlled according to a certain temperature (generally, the temperature of the tower bottom liquid and the temperature in the tower) or a pressure point of the tower bottom.
However, the main problems with the prior art rectification column are: the heat source of the tower top steam of the rectifying tower is not fully utilized, so that the consumption of circulating water is high.
In addition, although a waste heat utilization system for a rectifying tower by adopting a heat pump is also adopted in the prior art, the waste heat utilization system has the defects that high-temperature steam is required to be used as a driving heat source, and the adaptability is poor.
Therefore, there is a need for improvement of the technology to overcome the disadvantages of the prior art, and to make use of the waste heat of the overhead vapor of the rectification column for the bottom heating, so as to reduce the consumption of the bottom vapor on the one hand, and the consumption of the circulating water for cooling the overhead vapor of the rectification column on the other hand.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an improved generation rectifying column waste heat utilization system based on class II heat pump reduces the consumption of steam consumption and refrigeration cycle water, reduces the running cost. The specific technical scheme is as follows:
an improved rectifying tower waste heat utilization system based on a second-class heat pump comprises a rectifying tower, a tower top steam output pipeline arranged at the top of the rectifying tower, a tower kettle liquid heating circulation pipeline arranged at the bottom of the rectifying tower, and a heat energy recovery and conversion system based on the second-class heat pump and used for utilizing steam waste heat output by the tower top steam output pipeline, wherein the heat energy recovery and conversion system comprises a concentrator, a condenser, a heat collector and a heater, the concentrator is connected with the condenser through a steam channel, the condenser is connected with the heat collector, the heat collector is connected with the heater through a steam channel, a solution circulation pipeline is connected between the heater and the concentrator, a working medium pump is arranged on the solution circulation pipeline, and a cooling water circulation pipeline is connected to the condenser of the heat energy recovery and conversion system; the tower top steam output pipeline comprises a first tower top steam branch pipe which is connected with the heat energy recovery conversion system and exchanges heat with a concentrator of the heat energy recovery conversion system, and the tower bottom liquid heating circulation pipeline is connected with the heat energy recovery conversion system and forms a heating circulation loop between heaters of the heat energy recovery conversion system.
As a further improvement of the present invention, the steam output pipeline at the top of the tower is further comprised of a connection heat energy recovery conversion system and a second steam branch pipe at the top of the tower for heat exchange with the heat collector of the heat energy recovery conversion system.
As the utility model discloses in one of the preferred scheme of the improved generation rectifying column waste heat utilization system based on class II heat pump, be provided with the circulating pump on the tower bottom liquid heating circulation pipeline.
Preferably, a reboiler using steam as a heat source is further arranged on the tower bottom liquid heating circulation pipeline.
As the utility model discloses in based on the second preferred scheme of the improved generation rectifying column waste heat utilization system of second class heat pump, be provided with heat transfer circulation pipeline on heat recovery conversion system's the heater, tower bottom liquid heating circulation pipeline pass through heat exchanger with heat transfer circulation pipeline connects, be provided with the circulating pump on the heat transfer circulation pipeline.
As a further improvement of the present invention, a section of low heat output pipe from the concentrator of the first tower top steam branch pipe is provided with a condenser, and the output end of the low heat output pipe is respectively connected with a steam-liquid return pipe for returning part of condensed steam condensate to the rectifying tower and a light component output pipe for outputting part of condensed steam condensate; wherein the vapor-liquid return pipe is connected to the rectifying tower.
The utility model discloses in, be provided with the circulating water cooling pipeline on the condenser, be provided with the governing valve that is used for adjusting circulating water flow on the circulating water cooling pipeline.
As a further improvement, be provided with steam pressure sensor on the top of the tower steam output tube the top of the rectifying column with be provided with the maintenance bypass between the low heat output tube, be provided with electrical control valve on the maintenance bypass, microcomputer control system is connected respectively to steam pressure sensor, electrical control valve.
The microcomputer control system PC maintains the stability of the steam pressure through the electric regulating valve according to the steam pressure measured by the steam pressure sensor.
The utility model discloses in, the tower bottom of rectifying column is provided with the heavy ends output tube.
As an optimized proposal of the utility model, the solution circulating pipeline is a lithium bromide solution circulating pipeline.
When the solution circulation pipeline is a lithium bromide solution circulation pipeline, the corresponding heat energy recovery and conversion system adopts a second type of lithium bromide absorption heat pump.
Description of overhead vapor flow: the steam at the top of the tower enters a heat energy recovery and conversion system, the temperature is reduced, the heat is released by condensation, and the condensed steam and liquid at the top of the tower are sent back to the original condenser pipeline. Wherein, increased the circulating water governing valve on the circulating water pipeline of current condenser, this mode can reduce the circulating water consumption.
The utility model has the advantages that:
first, the utility model discloses an improved generation rectifying column waste heat utilization system based on class II heat pump through setting up the heat recovery conversion system based on the connection rectifying column of class II heat pump for top of the tower steam is as heat recovery conversion system's drive steam, thereby can realize that heat recovery conversion system carries out high temperature heating to the tower bottoms liquid. Therefore, the waste heat of the tower top steam can be fully utilized, the steam consumption and the consumption of cooling circulating water can be reduced, and the operation cost is reduced. The utility model discloses can realize that the steam festival volume is about 30 ~ 45%, reduce the circulating water consumption of top of the tower vapour and be about 45%.
Second, the utility model discloses an improved generation rectifying column waste heat utilization system based on class II heat pump uses class II lithium bromide absorption heat pump as heat recovery conversion system, and it compares with a class I heat pump, has overcome a class I heat pump of conventionality and need use the drawback of high-temperature steam as the drive heat source, and its adaptability is better.
Thirdly, the utility model discloses an improved generation rectifying column waste heat utilization system based on second class heat pump through retrieving rectifying column top steam 70 ℃ -135 ℃ low level heat energy, converts it to the high grade heat medium of 40 ℃ -50 ℃ than the low level heat, than the heat exchanger direct heating mode, can practice thrift the steam volume and reach 40%; or the heat of the medium temperature heat medium can be divided into two parts, and about 30 to 60 percent of the heat in the medium temperature heat medium is converted into high-grade valuable heat sources with the temperature 40 to 60 ℃ higher than that of the low level heat, such as steam and the like.
Fourth, the utility model discloses an improved generation rectifying column waste heat utilization system based on class II heat pump is provided with the condenser of overhauing the bypass and connecting the maintenance bypass to set up respectively on top of the tower steam output pipeline and the maintenance bypass and connect microcomputer control system's steam pressure sensor and electrical control valve, according to the aperture of the pressure control condenser circulating water governing valve of top of the tower vapour, heat recovery conversion system (class II heat pump) sets up circulating water governing valve equally and is used for the load to adjust. Therefore, the stability and the reliability of the operation of the waste heat utilization system of the rectifying tower are further improved while the waste heat utilization is realized, the quality of a rectifying product is favorably ensured, and the maintenance of the waste heat utilization system of the rectifying tower is facilitated.
Fifth, the utility model discloses an improved generation rectifying column waste heat utilization system based on class II heat pump utilizes the top of the tower steam of rectifying column directly to get into class II heat pump set, and the steam is whole to be utilized at the top of the tower of normal operating, and former top of the tower condenser can regard as reserve.
Sixth, the utility model discloses an improved generation rectifying column waste heat utilization system based on class II heat pump is to the tower cauldron liquid direct heating of rectifying column, also can prepare high-order medium and utilize the indirect heating of heat exchanger, and original reboiler remains, according to the hot demand automatic adjustment steam of tower cauldron liquid and mend.
Drawings
Fig. 1 is one of the structural schematic diagrams of an improved rectifying tower waste heat utilization system based on a class ii heat pump of the present invention;
fig. 2 is a second schematic structural diagram of an improved rectifying tower waste heat utilization system based on a second type heat pump according to the present invention;
fig. 3 is a third schematic structural diagram of an improved rectifying tower waste heat utilization system based on a second-class heat pump of the present invention;
fig. 4 is a fourth schematic structural diagram of an improved rectifying tower waste heat utilization system based on a second-class heat pump of the present invention;
fig. 5 is a schematic view of the thermal energy recovery conversion system of fig. 1 to 4.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 and 5 show an embodiment of an improved rectifying tower waste heat utilization system based on a second-type heat pump, which includes a rectifying tower, a tower top steam output pipeline arranged at the top of the rectifying tower, a tower bottom liquid heating circulation pipeline arranged at the bottom of the rectifying tower, and a heat energy recovery conversion system based on a second-type heat pump for utilizing the steam waste heat output by the tower top steam output pipeline, wherein the heat energy recovery conversion system includes a concentrator, a condenser, a heat collector and a heater, the concentrator is connected with the condenser through a steam channel, the condenser is connected with the heat collector, the heat collector is connected with the heater through a steam channel, a solution circulation pipeline is connected between the heater and the concentrator, a working medium pump is arranged on the solution circulation pipeline, and a cooling water circulation pipeline is connected with the condenser of the heat energy recovery conversion system; the tower top steam output pipeline comprises a first tower top steam branch pipe which is connected with the heat energy recovery conversion system and exchanges heat with a concentrator of the heat energy recovery conversion system, and the tower bottom liquid heating circulation pipeline is connected with the heat energy recovery conversion system and forms a heating circulation loop between heaters of the heat energy recovery conversion system.
The internal working principle of the heat energy recovery and conversion system based on the second-class heat pump is as follows:
the heat energy recovery and conversion system (the second type of lithium bromide absorption heat pump unit) follows the carnot reverse cycle principle and the principle of thermodynamics law that low-temperature heat energy cannot be converted into high-grade heat energy without cost. Water is a heat-carrying agent and has the characteristic of vaporization and heat absorption; the absorbent is a concentrated lithium bromide solution with the characteristics of strong water absorption and large heat release. The heat energy conversion comprises the following main steps:
(1) The characteristic of vaporization and heat absorption of water (as a heat transfer agent) is utilized in a heat collector, and a large amount of heat is obtained from low-temperature waste heat such as a tower top vapor phase;
(2) Concentrated solution (concentrated lithium bromide solution) in the heater is used as an absorbent to strongly absorb water vapor, and simultaneously, the concentrated solution is diluted by the heater and releases a large amount of heat to heat high-temperature heating media such as external kettle liquid;
(3) Heating and concentrating the dilute solution in the concentrator by low-temperature waste heat such as a tower top vapor phase, and then feeding the concentrated solution to a heater for continuous recycling;
(4) And the water vapor evaporated from the dilute solution in the condenser is condensed by circulating water and then is recycled in the evaporator.
The combination of (3) and (4) corresponds to negative pressure rectification of the working medium.
As shown in fig. 5, as a further improvement of this embodiment, the overhead vapor output pipeline further includes a second overhead vapor branch pipe connected to the thermal energy recovery and conversion system and exchanging heat with a heat remover of the thermal energy recovery and conversion system.
As shown in fig. 2, as one of the preferable solutions of the improved rectifying tower waste heat utilization system based on the second-type heat pump in the present embodiment, a circulating pump is disposed on the tower bottom liquid heating circulation pipeline.
As shown in fig. 4, it is preferable that a reboiler using steam as a heat source is further disposed on the tower bottom heating circulation line.
And the tower bottom liquid in the rectifying tower is heated by the heat energy recovery and conversion system and then sent to the reboiler for flash evaporation.
As shown in fig. 3 and 5, as a second preferred embodiment of the improved rectifying tower waste heat utilization system based on the second type of heat pump in this embodiment, a heat exchange circulation pipeline is arranged on a heater of the heat energy recovery and conversion system, the tower bottom liquid heating circulation pipeline is connected with the heat exchange circulation pipeline through a heat exchanger, and a circulation pump is arranged on the heat exchange circulation pipeline.
As shown in fig. 4, as a further improvement of this embodiment, a condenser is disposed on a section of the low heat output pipe from the concentrator of the first tower top steam branch pipe, and an output end of the low heat output pipe is respectively connected to a vapor-liquid return pipe for returning a part of condensed vapor condensate to the rectifying tower and a light component output pipe for outputting the part of condensed vapor condensate; wherein the vapor-liquid return pipe is connected to the rectifying tower.
As shown in fig. 4, the steam outlet of the tower top steam is provided with two branch pipes, one of the two branch pipes (the first tower top steam branch pipe) is used as a low-temperature waste heat pipeline for exchanging heat with the thermal energy recovery and conversion system, and the other branch pipe (the service bypass) of the two branch pipes is merged with a section of low-heat output pipe from the concentrator and then connected with the condenser.
As shown in fig. 4, in this embodiment, a circulating water cooling line CW is disposed on the condenser, and the circulating water cooling line CW is provided with an adjusting valve for adjusting the flow rate of circulating water.
As shown in fig. 4, as a further improvement of this embodiment, a steam pressure sensor is disposed on the steam output pipeline at the top of the tower, an overhaul bypass is disposed between the top of the rectifying tower and the low heat output pipeline, an electric control valve is disposed on the overhaul bypass, and the steam pressure sensor and the electric control valve are respectively connected to a microcomputer control system PC.
The microcomputer control system PC maintains the stability of the steam pressure through the electric regulating valve according to the steam pressure measured by the steam pressure sensor.
In this embodiment, as shown in fig. 4, a heavy component output pipe is disposed at the bottom of the rectifying tower.
As a preferable mode of the solution circulation line in this embodiment, as shown in fig. 5, the solution circulation line is a lithium bromide solution circulation line.
When the solution circulation pipeline is a lithium bromide solution circulation pipeline, the corresponding heat energy recovery and conversion system adopts a second type lithium bromide absorption heat pump.
Description of vapor flow at the top of the column: the steam at the top of the tower enters a heat energy recovery and conversion system, the temperature is reduced, the heat is released by condensation, and the condensed steam and liquid at the top of the tower are sent back to the original condenser pipeline. Wherein, increased the circulating water governing valve on the circulating water pipeline of current condenser, this mode can reduce the circulating water consumption.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An improved rectifying tower waste heat utilization system based on a second-class heat pump is characterized by comprising a rectifying tower, a tower top steam output pipeline arranged at the top of the rectifying tower, a tower bottom liquid heating circulation pipeline arranged at the bottom of the rectifying tower, and a heat energy recovery and conversion system based on the second-class heat pump and used for utilizing steam waste heat output by the tower top steam output pipeline, wherein the heat energy recovery and conversion system comprises a concentrator, a condenser, a heat collector and a heater, the concentrator is connected with the condenser through a steam channel, the condenser is connected with the heat collector, the heat collector is connected with the heater through a steam channel, a solution circulation pipeline is connected between the heater and the concentrator, a working medium pump is arranged on the solution circulation pipeline, and a cooling water circulation pipeline is connected to the condenser of the heat energy recovery and conversion system; the tower top steam output pipeline comprises a first tower top steam branch pipe which is connected with the heat energy recovery conversion system and exchanges heat with a concentrator of the heat energy recovery conversion system, and the tower bottom liquid heating circulation pipeline is connected with the heat energy recovery conversion system and forms a heating circulation loop between heaters of the heat energy recovery conversion system.
2. The improved rectifying tower waste heat utilization system based on the second-class heat pump as recited in claim 1, wherein the tower top steam output pipeline further comprises a second tower top steam branch pipe connected with the heat energy recovery conversion system and exchanging heat with a heat collector of the heat energy recovery conversion system.
3. The improved rectifying tower waste heat utilization system based on the second-class heat pump as claimed in claim 1, wherein a circulating pump is arranged on the tower bottom liquid heating circulating pipeline.
4. The improved rectifying tower waste heat utilization system based on the second-class heat pump as claimed in claim 3, characterized in that a reboiler using steam as a heat source is further arranged on the tower bottom liquid heating circulation pipeline.
5. The improved rectifying tower waste heat utilization system based on the second-class heat pump as claimed in claim 1, wherein a heat exchange circulating pipeline is arranged on a heater of the heat energy recovery and conversion system, the tower bottom liquid heating circulating pipeline is connected with the heat exchange circulating pipeline through a heat exchanger, and a circulating pump is arranged on the heat exchange circulating pipeline.
6. The improved rectifying tower waste heat utilization system based on the second type of heat pump as claimed in claim 1, wherein a condenser is arranged on a section of low heat output pipe from the concentrator of the first tower top steam branch pipe, and the output end of the low heat output pipe is respectively connected with a steam-liquid return pipe for returning part of condensed steam condensate to the rectifying tower and a light component output pipe for outputting part of condensed steam condensate; wherein the vapor-liquid return pipe is connected to the rectifying tower.
7. The improved rectifying tower waste heat utilization system based on the second-class heat pump as claimed in claim 6, wherein a circulating water cooling pipeline is arranged on the condenser, and an adjusting valve for adjusting the flow rate of circulating water is arranged on the circulating water cooling pipeline.
8. The improved rectifying tower waste heat utilization system based on the second-class heat pump as recited in claim 6, wherein a steam pressure sensor is arranged on the top steam output pipe, an overhaul bypass is arranged between the top of the rectifying tower and the low heat output pipe, an electric regulating valve is arranged on the overhaul bypass, and the steam pressure sensor and the electric regulating valve are respectively connected with a microcomputer control system.
9. The improved rectifying tower waste heat utilization system based on the second-class heat pump as claimed in claim 1, wherein a heavy component output pipe is arranged at the bottom of the rectifying tower.
10. The improved rectifying tower waste heat utilization system based on the second-class heat pump as recited in claim 1, wherein the solution circulation pipeline is a lithium bromide solution circulation pipeline, and the heat energy recovery conversion system is a heat energy recovery conversion system using a second-class lithium bromide absorption heat pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221519387.8U CN218166001U (en) | 2022-06-17 | 2022-06-17 | Improved generation rectifying column waste heat utilization system based on second class heat pump |
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| CN202221519387.8U CN218166001U (en) | 2022-06-17 | 2022-06-17 | Improved generation rectifying column waste heat utilization system based on second class heat pump |
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| CN202221519387.8U Active CN218166001U (en) | 2022-06-17 | 2022-06-17 | Improved generation rectifying column waste heat utilization system based on second class heat pump |
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- 2022-06-17 CN CN202221519387.8U patent/CN218166001U/en active Active
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