CN217274088U - Low-grade waste heat steam supercharging energy-saving device - Google Patents
Low-grade waste heat steam supercharging energy-saving device Download PDFInfo
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- CN217274088U CN217274088U CN202220131927.9U CN202220131927U CN217274088U CN 217274088 U CN217274088 U CN 217274088U CN 202220131927 U CN202220131927 U CN 202220131927U CN 217274088 U CN217274088 U CN 217274088U
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Abstract
The utility model belongs to the technical field of chemical production device, specifically be a low-grade used heat steam pressure boost economizer. The device comprises a steam-water separation tank, a steam turbine, a spray cooling device and a desalted water tank, wherein each urea washing tower is connected with a low-grade steam collecting header pipe through a pipeline; the low-grade steam collecting header pipe is connected with the steam-water separation tank through a flowmeter and a press inlet control valve; the steam-water separation tank is connected with the steam turbine and then connected with the spray cooling device; the desalting water tank is connected with the spray cooling device through a spray booster pump. The device utilizes the steam compressor to better utilize low-grade steam which cannot be utilized originally in various chemical processes on the premise of not influencing original process equipment, thereby achieving the purposes of saving energy, reducing consumption and improving efficiency.
Description
Technical Field
The utility model belongs to the technical field of chemical production device, a low-grade used heat steam pressure boost utilizes system is related to, specifically is a low-grade used heat steam pressure boost economizer.
Background
At present, a lot of low-temperature (less than or equal to 150 ℃) waste heat exists in the chemical production process. The waste heat can not generate high-quality low-pressure steam due to low temperature, and can only generate low-pressure steam of 0.1-0.25 MPa, and the temperature and pressure of the generated steam are low, so that most of the generated steam can not be used in the process production, and can only be conveyed to an air cooler or a water cooler through a pipeline, and is cooled by the air cooler or the water cooler, so that the low-pressure steam is condensed into condensate, and the condensate is recycled by each system. In the continuous circulation process, a large amount of circulating water and electricity are consumed, more equipment and the like are invested to cool and condense the steam, and on the other hand, a large amount of outsourcing steam or specially producing the steam by using fuel is needed for a plurality of chemical devices, so that the production cost is increased, the production benefit of enterprises is seriously influenced, and meanwhile, the energy conservation and emission reduction of the enterprises are also influenced.
The low-grade calorific value of one ton of waste heat steam is converted into 70-80 kg of standard coal, if 10 tons of waste heat steam are delivered out in one hour, and if 8000 hours in one year, the waste heat steam can be better utilized under the condition of not increasing more equipment and energy consumption, 6400 tons of standard coal can be saved in one year, and considerable economic benefit can be brought to a company.
Disclosure of Invention
The present invention aims at solving the above technical problems and providing a low-grade waste heat steam supercharging energy-saving device. The device utilizes the steam compressor to better utilize low-grade steam (0.1-0.25 MPaA) which cannot be utilized originally in various chemical processes on the premise of not influencing original process equipment, thereby achieving the purposes of saving energy, reducing consumption and improving efficiency.
In order to realize the purpose of the invention, the technical scheme of the utility model is as follows:
a low-grade waste heat steam supercharging energy-saving device comprises a steam-water separation tank, a steam turbine, a spray cooling device and a desalted water tank, wherein the tertiary cooling and the quaternary cooling of a triamine tertiary urea washing tower are connected through a pipeline and a valve; connecting the secondary cooling and the tertiary cooling of the triamine secondary stage urine washing tower through a pipeline and a valve; connecting the primary cooling and the secondary cooling of the triamine primary stage urine washing tower through a pipeline and a valve; the triamine primary stage urea washing tower, the triamine secondary stage urea washing tower and the triamine tertiary stage urea washing tower are all connected with a low-grade steam collecting main pipe through pipelines; the low-grade steam collecting header pipe is connected with the steam-water separation tank through a flowmeter and a press inlet control valve; the steam-water separation tank is connected with the steam turbine and then connected with the spray cooling device; the desalting water tank is connected with the spray cooling device through a spray booster pump.
The triamine primary stage urea washing tower, the triamine secondary stage urea washing tower and the triamine tertiary stage urea washing tower are urea washing towers, namely, circulating gas in the liquid urea-triamine production process is used for washing. The urea washing tower needs to control the temperature in sections, so each urea washing tower is divided into different sections, heat exchange is carried out in a mode that desalted water is evaporated into low pressure in each section, and the temperature of the heat exchange urea solution is controlled by controlling the steam pressure, so the urea washing tower is called as different cooling sections.
The front end and the rear end of the steam turbine are respectively provided with a compressor inlet corrugated expansion joint and a compressor outlet corrugated expansion joint, and the steam-water separation tank is connected with the compressor inlet corrugated expansion joint and then enters the steam turbine.
Low-grade steam from triamine tertiary washing tower tertiary cold, amine tertiary washing tower quaternary cold, triamine secondary washing tower secondary cold, triamine secondary washing tower tertiary cold, triamine primary washing tower primary cold and triamine primary washing tower secondary cold jointly enters a low-grade steam collecting main pipe, and a flow meter, a press inlet control valve and a steam-water separation tank are arranged on the low-grade steam collecting main pipe for flow measurement, control and separation; and low-grade steam enters the steam turbine through the corrugated expansion joint at the inlet of the press to be pressurized to generate high-grade steam, and then enters the spray cooling device through the corrugated expansion joint at the outlet of the press.
The pipeline at the outlet of the spray cooling device is divided into two parts, and one branch pipe is connected with a high-grade steam delivery pipeline; the other branch pipe is an anti-surge pipeline and is connected with an inlet of the steam-water separation tank through a control valve arranged on the pipeline. The control valve is an anti-surge pipeline control valve.
And the pipeline converged with the pipeline at the outlet of the spray cooling device is connected with a pipe network through a high-grade steam delivery pipeline.
The desalting water storage tank or the steam condensate storage tank is connected with the desalting water tank through a desalting water or steam condensate conveying pipe.
The spray booster pump is divided into a first spray booster pump and a second spray booster pump, and the desalted water tank is collected through the first spray booster pump and the second spray booster pump respectively and then enters the spray cooling device after being connected with an outlet pipeline of the booster pump. And the first spray booster pump is connected with the desalted water tank through a pump return pipeline.
Desalted water or steam condensate from outside the battery compartment enters a desalted water tank through a pipeline for metering control, and then is pressurized through a spray booster pump, and the pressurized desalted water or steam condensate is divided into two paths, wherein one path enters a spray cooling device through an outlet pipeline of the booster pump; the other path of the pressure control loop flows back to the desalted water tank through the pump backflow pipeline, and the pressure of the outlet pipeline of the booster pump can be controlled.
The high-grade steam cooled by the spray cooling device is divided into two paths, one path of steam flows back to an inlet of the press through the anti-surge pipeline and the anti-surge pipeline control valve, and the other path of steam flows into a steam main pipe of the whole plant through the high-grade steam delivery pipeline.
Compared with the prior art, the beneficial effects of the utility model are that:
(one), the utility model discloses an efficient, with low costs, environmental protection and energy saving's low-grade used heat steam pressure boost economizer can produce highly compressed high-grade superheated steam with low-grade used heat steam through the compressor pressurization, and superheated steam produces the saturated high-grade steam that has 8 ~ 9 ℃ superheat degree through the heat abstractor cooling back, and this high-grade steam is sent into the steam house steward of whole factory and is utilized.
And (II) recycling low-grade waste heat steam to achieve the purposes of saving energy, reducing consumption and improving efficiency.
And thirdly, the system device has reasonable design and can ensure the normal operation of the steam pressurization system.
Description of the drawings:
fig. 1 is a schematic structural diagram of the low-grade waste heat steam supercharging energy-saving device of the present invention.
Wherein, 1-triamine primary stage urea washing tower primary cooling low-grade steam pressure regulating valve, 2-triamine primary stage urea washing tower secondary cooling low-grade steam pressure regulating valve, 3-low-grade steam collecting main pipe, 4-triamine secondary stage urea washing tower secondary cooling low-grade steam pressure regulating valve, 5-triamine secondary stage urea washing tower tertiary cooling low-grade steam pressure regulating valve, 6-triamine tertiary stage urea washing tower tertiary cooling low-grade steam pressure regulating valve, 7-triamine tertiary stage urea washing tower quaternary cooling low-grade steam pressure regulating valve, 8-collecting main pipe flowmeter, 9-press inlet control valve, 10-steam-water separation tank SP01, 11-press inlet ripple expansion joint FJ01, 12-steam turbine C40201, 13-press outlet ripple expansion joint FJ03, 14-spray cooling device C01, 15-outside desalted water or steam condensate conveying pipe, 16-desalted water tank V40201, 17-spray booster pump P40201A/B, 18-booster pump outlet pipeline, 19-pump return pipeline, 20-anti-surge pipeline control valve, 21-high-grade steam delivery pipeline.
Detailed Description
In order to make the inventive content of the present invention more comprehensible, the present invention will be further described with reference to the accompanying drawings and the following detailed description. It should not be understood that the scope of the above-described subject matter of the present invention is limited to the following examples.
The triamine tertiary urea washing tower with tertiary cooling described in the application refers to a urea washing tower in a triamine tertiary device, three heat exchange assemblies are arranged in the urea washing tower, and the three heat exchange assemblies are respectively a first heat exchange assembly and are called primary cooling; a second heat exchange assembly, referred to as secondary cooling; the third heat exchange component is called as triple cold, namely triple cold of the triamine triple stage urine washing tower. The heat exchange assemblies exchange heat by furnace water, the furnace water is changed into steam after heat exchange, and the furnace water exchanges heat; the furnace water is changed into steam after heat exchange.
The rest of the three phases are similar to the three cold phases of the triamine three-phase urea washing tower, for example, the four cold phases of the triamine three-phase urea washing tower is the third heat exchange component arranged in the urea washing tower in the triamine third-phase device.
Example 1:
as shown in fig. 1, a low-grade waste heat steam supercharging energy-saving device comprises a steam-water separation tank, a steam turbine, a spray cooling device and a desalting water tank, wherein a triamine tertiary urea washing tower is respectively connected with a triamine tertiary urea washing tower tertiary cold and an amine tertiary urea washing tower quaternary cold through valves; the triamine secondary stage urine washing tower is respectively connected with the triamine secondary stage urine washing tower secondary cooling tower and the triamine secondary stage urine washing tower tertiary cooling tower through valves; the triamine primary stage urine washing tower is respectively connected with the triamine primary stage urine washing tower primary cooling device and the triamine primary stage urine washing tower secondary cooling device through valves; the triamine primary stage urine washing tower, the triamine secondary stage urine washing tower and the triamine tertiary stage urine washing tower are all connected with a low-grade steam collecting header pipe through pipelines; the low-grade steam collecting main pipe is connected with the steam-water separation tank through a flowmeter and a press inlet control valve; the steam-water separation tank is connected with the steam turbine and then connected with the spray cooling device; the desalting water tank is connected with the spray cooling device through a spray booster pump.
The front end and the rear end of the steam turbine are respectively provided with a compressor inlet corrugated expansion joint and a compressor outlet corrugated expansion joint, and the steam-water separation tank is connected with the compressor inlet corrugated expansion joint and then enters the steam turbine.
Low-grade steam from triamine tertiary washing tower tertiary cold, amine tertiary washing tower quaternary cold, triamine secondary washing tower secondary cold, triamine secondary washing tower tertiary cold, triamine primary washing tower primary cold and triamine primary washing tower secondary cold jointly enters a low-grade steam collecting main pipe, and a flow meter, a press inlet control valve and a steam-water separation tank are arranged on the low-grade steam collecting main pipe for flow measurement, control and separation; and low-grade steam enters the steam turbine through the inlet corrugated expansion joint of the press to be pressurized to generate high-grade steam, and then enters the spray cooling device through the outlet corrugated expansion joint of the press.
The pipeline at the outlet of the spray cooling device is divided into two parts, and one branch pipe of the spray cooling device is connected with a high-grade steam delivery pipeline; the other branch pipe is an anti-surge pipeline and is connected with an inlet of the steam-water separation tank through a control valve arranged on the pipeline, so that the stable operation of the system is ensured. The control valve is an anti-surge pipeline control valve.
And the pipeline converged with the pipeline at the outlet of the spray cooling device is connected with a pipe network through a high-grade steam delivery pipeline.
The off-site desalted water storage tank or the steam condensate storage tank is connected with the desalted water tank through a desalted water or steam condensate conveying pipe.
The spray booster pump is divided into a first spray booster pump and a second spray booster pump, and the desalted water tank is collected through the first spray booster pump and the second spray booster pump respectively and then enters the spray cooling device after being connected with an outlet pipeline of the booster pump. And the first spray booster pump is connected with the desalted water tank through a pump return pipeline.
Low-grade waste heat steam generated by the process device is sent to a low-grade steam collecting header pipe after passing through a regulating valve to control the steam pressure before the valve; and low-grade waste heat steam generated by other process devices is respectively subjected to pressure control regulation by the regulating valve and then is sent to the low-grade steam collecting header pipe. Each device is provided with a low-grade steam regulating valve for ensuring the steam pressure in front of the regulating valve, so that the heat exchange effect of the original process device is kept unchanged, and the relevant process indexes of the original process system are stabilized.
The low-grade steam of collecting the house steward is measured through the flowmeter (orifice plate flowmeter), gets into the pressure control master regulating valve of compressor import, makes the import pressure of steam turbine stable, for guaranteeing that the low-grade steam quality that gets into the steam turbine is qualified, sets up the catch water jar at the import of steam turbine, protects the long period steady safe operation of vapor compressor.
After the low-grade waste heat steam is pressurized by the steam turbine (after energy conversion), the temperature and the pressure are all increased. Wherein the outlet pressure of the steam compressor reaches 0.6MPaA, thereby improving the quality of low-grade steam. The pressurized superheated steam enters a temperature reduction device, and the superheated steam is cooled and saturated after steam condensate or desalted water is atomized. The method comprises the following steps that external steam condensate or desalted water enters a desalted water storage tank, then pressurization is carried out through a spray pump, the pressure reaches the pressure required by an atomizing nozzle, and the temperature of superheated steam reaches the temperature of high-grade saturated steam (the high-grade steam has the superheat degree of 8-9 ℃ for preventing heat loss) through cooling of two groups of 6 nozzles.
The high-grade steam after the temperature and the pressure are adjusted is divided into two paths, one path of the high-grade steam is conveyed to a steam main pipe of the whole plant through a pipeline, and the high-grade steam is required to be provided for other chemical systems; the other path is controlled by an anti-surge pipeline control valve to ensure that steam enters an inlet of the compressor, so that the safe and stable operation of the compressor is ensured.
Example 2:
low-grade steam (0.2MpaA, 120 ℃) from a triamine primary stage urea washing tower primary cold low-grade steam pressure regulating valve 1, a triamine primary urea washing tower secondary cold low-grade steam pressure regulating valve 2, a triamine secondary urea washing tower secondary cold low-grade steam pressure regulating valve 4, a triamine secondary urea washing tower tertiary cold low-grade steam pressure regulating valve 5, a triamine tertiary urea washing tower tertiary cold low-grade steam pressure regulating valve 6 and a triamine tertiary urea washing tower quaternary cold low-grade steam pressure regulating valve 7 jointly enter a low-grade steam collecting main pipe 3, and the low-grade steam collecting main pipe 3 is provided with relevant measuring, controlling and separating equipment (a collecting main pipe flowmeter 8, a press inlet control valve 9, a steam-water separating tank SP 0110, a press inlet corrugated expansion joint FJ 0111) and the like, then the low-grade steam enters a steam turbine C4020112 to be pressurized to generate high-grade superheated steam (0.65MpaA, 280 ℃), the gas enters a spray cooling device C0114 after passing through an outlet corrugated expansion joint FJ 0313 of the equipment press.
The method comprises the following steps that after the desalted water or steam condensate conveying pipe 15 from outside of a boundary region enters a desalted water tank V4020116 for metering control, pressurization is carried out through a spray booster pump P40201A/B17, the pressurized desalted water or steam condensate conveying pipe is divided into two paths, and one path enters a spray cooling device C0114 through a booster pump outlet pipeline 18; the other is returned to the desalted water tank V020116 (controlling the pressure in the booster pump outlet line 18) through the pump return line 19.
The high-grade steam (0.65Mpa, 170 ℃) cooled by the spray cooling device C0114 is divided into two paths, one path flows back to the inlet of the press through the anti-surge pipeline and the anti-surge pipeline control valve 20, and the other path is sent to a steam main pipe of the whole plant through the high-grade steam delivery pipeline 21.
Although the present invention has been described in detail with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims (8)
1. The utility model provides a low-grade used heat steam pressure boost economizer, the device includes catch water jar, steam turbine, spray cooling device and demineralized water jar, its characterized in that: connecting the tertiary cooling and the quaternary cooling of the triamine tertiary washing tower through a pipeline and a valve; connecting the secondary cooling and the tertiary cooling of the triamine secondary stage urine washing tower through a pipeline and a valve; connecting the primary cooling and the secondary cooling of the triamine primary stage urine washing tower through a pipeline and a valve; the triamine primary stage urine washing tower, the triamine secondary stage urine washing tower and the triamine tertiary stage urine washing tower are all connected with a low-grade steam collecting header pipe through pipelines; the low-grade steam collecting header pipe is connected with the steam-water separation tank through a flowmeter and a press inlet control valve; the steam-water separation tank is connected with the steam turbine and then connected with the spray cooling device; the desalting water tank is connected with the spray cooling device through a spray booster pump.
2. The low-grade waste heat steam supercharging energy-saving device according to claim 1, characterized in that: the front end and the rear end of the steam turbine are respectively provided with a compressor inlet corrugated expansion joint and a compressor outlet corrugated expansion joint, and the steam-water separation tank is connected with the compressor inlet corrugated expansion joint and then enters the steam turbine.
3. The low-grade waste heat steam supercharging energy-saving device according to claim 1, characterized in that: the pipeline at the outlet of the spray cooling device is divided into two parts, and one branch pipe of the spray cooling device is connected with a high-grade steam delivery pipeline; the other branch pipe is an anti-surge pipeline and is connected with an inlet of the steam-water separation tank through a control valve arranged on the pipeline.
4. The low-grade waste heat steam supercharging energy-saving device according to claim 3, characterized in that: the control valve is an anti-surge pipeline control valve.
5. The low-grade waste heat steam supercharging energy-saving device according to claim 3, characterized in that: the high-grade steam delivery pipeline is connected with a pipe network.
6. The low-grade waste heat steam supercharging energy-saving device according to claim 1, characterized in that: the desalting water storage tank or the steam condensate storage tank is connected with the desalting water tank through a desalting water or steam condensate conveying pipe.
7. The low-grade waste heat steam supercharging energy-saving device according to claim 1, characterized in that: the spray booster pump is divided into a first spray booster pump and a second spray booster pump, and the desalted water tank is collected through the first spray booster pump and the second spray booster pump respectively and then is connected with an outlet pipeline of the booster pump and then enters the spray cooling device.
8. The low-grade waste heat steam supercharging energy-saving device according to claim 7, characterized in that: and the first spray booster pump is connected with the desalted water tank through a pump return pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220131927.9U CN217274088U (en) | 2022-01-18 | 2022-01-18 | Low-grade waste heat steam supercharging energy-saving device |
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| CN202220131927.9U CN217274088U (en) | 2022-01-18 | 2022-01-18 | Low-grade waste heat steam supercharging energy-saving device |
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