CN217002001U - Waste heat utilization device in methanol synthesis process - Google Patents
Waste heat utilization device in methanol synthesis process Download PDFInfo
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- CN217002001U CN217002001U CN202220822292.7U CN202220822292U CN217002001U CN 217002001 U CN217002001 U CN 217002001U CN 202220822292 U CN202220822292 U CN 202220822292U CN 217002001 U CN217002001 U CN 217002001U
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Abstract
The utility model belongs to the technical field of energy utilization, and particularly relates to a waste heat utilization device for applying an organic Rankine cycle power generation process to a methanol synthesis process, which comprises working medium heating equipment, a turbine, condensing equipment, a methanol process medium heat source pipeline and a methanol process medium subsequent pipeline, wherein an inlet of the methanol process medium heat source pipeline is connected with a methanol synthesis device, an outlet of the methanol process medium heat source pipeline is communicated with a shell pass inlet of the working medium heating equipment, an inlet of the methanol process medium subsequent pipeline is connected with a shell pass outlet of the working medium heating equipment, a tube pass outlet of the working medium heating equipment is communicated with an inlet pipe of the turbine, an outlet pipe of the turbine is communicated with a shell pass inlet of the condensing equipment, and a shell pass outlet of the condensing equipment is communicated with a tube pass inlet of the working medium heating equipment. The utility model utilizes the organic Rankine cycle ORC technology to recycle the heat of the methanol reaction gas mixed material which is required to be forcibly cooled by air cooling and water cooling equipment and is discharged to the natural environment.
Description
Technical Field
The utility model belongs to the technical field of energy utilization, and relates to a waste heat utilization device for applying an organic Rankine cycle power generation process to a methanol synthesis process.
Technical Field
The organic Rankine cycle ORC is a Rankine cycle with low-boiling-point organic matters as working media, and has the following principle: the organic working medium absorbs heat in the thermodynamic equipment to generate working medium steam with certain pressure and temperature, and the working medium steam enters the turbine machinery (such as a turbine, a compressor, a steam turbine, a flue gas turbine, an expander and the like) to expand and do work, so that the generator is driven to output electric power outwards or drag other power machinery to do work. The working medium steam discharged from the turbine releases heat to cooling water in the condensing equipment, condenses into liquid working medium, and finally is pressurized by the working medium pump and returns to the working medium heating equipment, thus continuously circulating.
The essence of the organic Rankine cycle ORC is that different working media are selected to be matched according to heat sources of different grades, and the difficulty of the organic Rankine cycle ORC technology lies in system integration and optimization.
In the existing methanol synthesis process, air cooling and water cooling are generally adopted to forcibly cool a methanol reaction gas mixture with the temperature of more than 100 ℃, heat is directly discharged to the natural environment, and although the cooling of the methanol reactor mixture can be realized, a large amount of circulating water and electric energy can be consumed, and the heat waste of the methanol reaction gas mixture is caused at the same time.
Disclosure of Invention
The utility model provides a waste heat recovery device in a methanol synthesis process, aiming at solving the technical problem of energy and heat waste in the existing methanol synthesis process.
The technical solution of the utility model is as follows:
the utility model provides a waste heat utilization equipment in methyl alcohol synthetic process, includes working medium firing equipment, turbine, condensing equipment, methyl alcohol technology medium heat source pipeline and the follow-up pipeline of methyl alcohol technology medium, the entry linkage methyl alcohol synthesizer of methyl alcohol technology medium heat source pipeline, the export of methyl alcohol technology medium heat source pipeline and working medium firing equipment's shell side entry intercommunication, the entry of the follow-up pipeline of methyl alcohol technology medium connects the shell side export of working medium firing equipment, working medium firing equipment tube side export and turbine inlet pipe intercommunication, the outlet pipe of turbine and condensing equipment's shell side entry intercommunication, condensing equipment's shell side export and working medium firing equipment's tube side entry intercommunication.
Further, the working medium heating device is an evaporator.
Further, the turbine is a turbine, and the turbine is communicated with the tube side outlet of the evaporator.
Further, a generator is included, and the turbine drives the generator.
Further, the condensing device is a condenser, and the condensing medium flows through the tube pass of the condenser.
Furthermore, a working medium pump is arranged between the outlet of the condenser and the evaporator.
Furthermore, the working medium pump is a turbine working medium pump.
Furthermore, the turbine working medium pump is communicated with a methanol process medium subsequent pipeline, and a medium in the methanol process medium subsequent pipeline drives the turbine working medium pump.
Furthermore, the methanol process medium subsequent pipeline is provided with a main pipeline and a branch pipeline, the turbine working medium pump is communicated with the main pipeline of the methanol process medium subsequent pipeline, and the branch pipeline is provided with a flow control valve.
Furthermore, organic pentafluoropropane flows in the tube pass of the working medium heating equipment.
The utility model has the beneficial effects that: by utilizing an Organic Rankine Cycle (ORC) technology, the heat of the methanol reaction gas mixed material which is directly discharged to the natural environment after air cooling and water cooling forced cooling is adopted in the prior art is utilized.
1. The utility model utilizes the organic Rankine cycle ORC technology to convert the heat of the methanol reaction gas mixed material which is directly discharged into the natural environment and needs to be cooled by air cooling and water cooling, into high-quality electric energy, thereby realizing the reutilization of heat energy and reducing the energy waste.
2. The heat of the methanol reaction gas mixed material which is directly discharged to the natural environment after the existing air cooling and water cooling forced cooling is adopted is converted and utilized, the power generation device replaces air cooling equipment and/or water cooling equipment, the temperature and the pressure of the methanol reaction gas mixed material are reduced, and the consumption of circulating water and electric energy required by refrigeration is reduced.
3. According to the utility model, the turbine working medium pump is arranged between the outlet of the condenser and the evaporator, the turbine working medium pump is communicated with the methanol process medium subsequent pipeline, the medium in the methanol process medium subsequent pipeline drives the turbine working medium pump, the kinetic energy of the medium (methanol reaction gas mixed material) in the methanol process medium subsequent pipeline is fully utilized, the power energy for driving the working medium pump is saved, the process medium enters the subsequent process after the pressure and the temperature of the process medium are further reduced, the waste of energy is reduced, and the utilization rate of the energy of the methanol process medium is improved.
4. The working medium adopts the organic pentafluoropropane, and the non-toxic, non-combustible and low-boiling-point physicochemical property of the pentafluoropropane is utilized to perform expansion cycle power generation, so that the environment-friendly power generation system is environment-friendly.
Drawings
FIG. 1 is a schematic block diagram of a first embodiment of the present invention;
FIG. 2 is a schematic block diagram of a second embodiment of the present invention;
in the figure: 1-an evaporator; 2-a turbine; 3-a condenser; 4-a working medium pump; 41-a turbine working medium pump; 5-a generator; 6-methanol process medium heat source pipeline; 7-methanol process media follow-up line; 8-flow valve.
Detailed Description
The first embodiment of the present invention:
the method recycles the waste heat of the methanol reaction gas mixed material with the temperature of 110-130 ℃ generated in the methanol synthesis process by utilizing the Rankine cycle power generation process, utilizes the low-grade heat to generate power, converts the heat directly discharged to the natural environment by the process medium which needs forced cooling by air cooling equipment and/or water cooling equipment into high-quality electric energy, reduces the waste of heat energy, converts the heat energy into the high-quality electric energy, and completes the reutilization of energy; the power generation device replaces air cooling equipment and/or water cooling equipment, the temperature of the methanol reaction gas mixture is reduced to 65-80 ℃, and then the methanol reaction gas mixture is naturally cooled to 40 ℃, so that the separation of methanol is completed, and the consumption of circulating water and electric energy required by refrigeration is reduced.
The organic rankine cycle ORC power generation is applied to the flow of a methanol synthesis plant, and as shown in fig. 1, the system comprises three loops:
organic working medium loop: the methanol reaction gas mixed material with the temperature of 110-130 ℃ output by the methanol synthesis device is used as a heat supply source and enters working medium heating equipment, namely an evaporator 1 in figure 1, through a methanol process medium heat source pipeline 6, organic working medium in the evaporator 1 absorbs heat released by the methanol reaction gas mixed material to be gasified to form working medium steam, the working medium steam enters a turbine 2 in figure 1 to expand and do work, heat energy is converted into mechanical energy, the working medium steam after doing work releases heat and enters condensing equipment, namely a condenser 3 in figure 1 to release heat again to be converted into liquid working medium, and the liquid working medium returns to the working medium heating equipment evaporator 1 again to be recycled.
Methanol process media loop: the methanol reaction gas mixture generated by the methanol synthesis device flows in the tube pass of the methanol process medium heat source pipeline 6, after entering the working medium heating equipment evaporator 1, the heat is transferred to the organic working medium in the shell pass of the evaporator 1, the temperature of the methanol reaction gas mixture is reduced, and the methanol reaction gas mixture leaves the evaporator through the methanol process medium subsequent pipeline 7 and is sent to the subsequent process.
A cooling water circuit: condenser 3 chooses for use water-cooled condenser, and the cooling effect is good, and refrigeration efficiency is high, and the cooling water passes through recirculated cooling water pipeline and gets into condenser 3, cools off organic working medium, and cooling water temperature risees and leaves condenser 3, and the water circulating system that returns through recirculated cooling water return water pipeline carries out circulative cooling.
The organic working medium of the organic Rankine cycle ORC in the device adopts organic pentafluoropropane. The non-toxic, non-inflammable and low-boiling-point physicochemical property of the pentafluoropropane is utilized to carry out expansion cycle power generation.
Further optimizing, the liquid pentafluoropropane enters the evaporator 1 unit to absorb heat of a reaction gas mixed material heat source to form saturated or superheated steam, the saturated or superheated steam enters the turbine 2, the turbine 2 is connected with and drives the generator 5, after the heat energy is converted into mechanical energy, the generator 5 is driven to output electric power outwards, and the mechanical energy is further converted into electric energy.
Further optimize, add working medium pump 4 between condenser 3 and evaporimeter 1, the pentafluoropropane vapour after the acting gets into condenser 3 afterwards, becomes liquid pentafluoropropane, accelerates to get back to evaporimeter 1 through working medium pump 4 and carries out cyclic utilization, improves working medium circulation efficiency to improve the cooling efficiency and the turbine generating efficiency of methyl alcohol reaction gas mixture.
Based on the further optimization of the above embodiment, the present invention provides a second embodiment, please refer to fig. 2, the working medium pump is preferably a turbine working medium pump 41, the methanol process medium subsequent pipeline 7 is provided with a main pipeline and a branch pipeline, the branch pipeline is provided with a flow control valve 8, the turbine working medium pump 41 is communicated with the main pipeline of the methanol process medium subsequent pipeline 7, the medium in the methanol process medium subsequent pipeline 7 drives the turbine working medium pump 41, and the flow of the medium in the main pipeline is controlled by adjusting the flow control valve 8 on the branch pipeline. The process medium methanol reaction gas mixture still has kinetic energy after the temperature of the process medium methanol reaction gas mixture is reduced, and can be used as power for driving the working medium pump, so that power energy for driving the working medium pump is saved, the pressure and the temperature of the process medium are further reduced and then enter a subsequent process, the waste of energy is reduced, and the utilization rate of the energy of the methanol process medium is improved.
The waste heat power generation implementation parameters are shown in table 1:
TABLE 1 residual Heat resource parameters
According to the above table, in the actual production, the temperature generated by the methanol synthesis device is 115-130 ℃, the pressure is 7-8.2MPa, the flow rate of the mixed material of the methanol reactor with the temperature of 110-120t/h is subjected to heat exchange with liquid pentafluoropropane through an evaporator, the temperature is reduced to 65-85 ℃, the mixed material is cooled to 50-65 ℃ after passing through and driving a turbine working medium pump, and then the mixed material is naturally cooled to 40 ℃ to separate out a methanol product; the annual energy production of the power generation by gasifying the organic working medium liquid pentafluoropropane through the evaporator and entering the turbine to do work through expansion is 2585.5 ten thousand kW.h, the annual standard coal is saved by about 8274 tons, and CO is generated2The emission reduction amount is nearly 20344 tons every year, good economic benefits are brought to enterprises, contribution is made to carbon neutralization in China, and good social benefits and environmental benefits are achieved.
The waste heat of the methanol reaction gas mixed material with the temperature of more than 100 ℃ generated by the methanol synthesis device is used for generating power by utilizing the organic Rankine cycle ORC, the waste heat is converted into high-grade electric energy, and the kinetic energy of the methanol reaction gas mixed material is continuously used as the power for driving the working medium pump.
Claims (10)
1. The utility model provides a waste heat utilization equipment in methyl alcohol synthetic process which characterized in that: the methanol synthesis device comprises working medium heating equipment, a turbine, condensing equipment, a methanol process medium heat source pipeline (6) and a methanol process medium follow-up pipeline (7), wherein an inlet of the methanol process medium heat source pipeline (6) is connected with a methanol synthesis device, an outlet of the methanol process medium heat source pipeline (6) is communicated with a shell pass inlet of the working medium heating equipment, an inlet of the methanol process medium follow-up pipeline (7) is connected with a shell pass outlet of the working medium heating equipment, a tube pass outlet of the working medium heating equipment is communicated with an inlet pipe of the turbine, an outlet pipe of the turbine is communicated with a shell pass inlet of the condensing equipment, and a shell pass outlet of the condensing equipment is communicated with a tube pass inlet of the working medium heating equipment.
2. The device for utilizing waste heat in the methanol synthesis process according to claim 1, wherein: the working medium heating equipment is an evaporator (1).
3. The device for utilizing waste heat in the methanol synthesis process according to claim 2, wherein: the turbine is a turbine (2), and the turbine (2) is communicated with the tube side outlet of the evaporator (1).
4. The device for utilizing the residual heat in the methanol synthesis process according to claim 3, characterized in that: also included is a generator (5), the turbine (2) driving the generator (5).
5. The device for utilizing waste heat in the methanol synthesis process according to claim 4, wherein: the condensing equipment is a condenser (3), and a condensing medium flows through the tube pass of the condenser (3).
6. The device for utilizing the residual heat in the methanol synthesis process according to claim 5, characterized in that: and a working medium pump (4) is arranged between the outlet of the condenser (3) and the evaporator (1).
7. The device for utilizing the residual heat in the methanol synthesis process according to claim 6, characterized in that: the working medium pump (4) is a turbine working medium pump (41).
8. The device for utilizing waste heat in the methanol synthesis process according to claim 7, wherein: the turbine working medium pump (41) is communicated with the methanol process medium subsequent pipeline (7), and the medium in the methanol process medium subsequent pipeline (7) drives the turbine working medium pump (41).
9. The device for utilizing waste heat in the methanol synthesis process according to claim 8, wherein: the methanol process medium subsequent pipeline (7) is provided with a main pipeline and a branch pipeline, the turbine working medium pump (41) is communicated with the main pipeline of the methanol process medium subsequent pipeline (7), and the branch pipeline is provided with a flow control valve (8).
10. The device for utilizing the residual heat in the methanol synthesis process according to claim 1, which is characterized in that: and an organic pentafluoropropane flows in the tube pass of the working medium heating equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220822292.7U CN217002001U (en) | 2022-04-11 | 2022-04-11 | Waste heat utilization device in methanol synthesis process |
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| CN202220822292.7U CN217002001U (en) | 2022-04-11 | 2022-04-11 | Waste heat utilization device in methanol synthesis process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115784841A (en) * | 2022-12-01 | 2023-03-14 | 南京诚志清洁能源有限公司 | Energy-saving methanol synthesis process and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115784841A (en) * | 2022-12-01 | 2023-03-14 | 南京诚志清洁能源有限公司 | Energy-saving methanol synthesis process and device |
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