CN110563240B - Sewage treatment system and method utilizing industrial waste heat steam based on hydrate method - Google Patents
Sewage treatment system and method utilizing industrial waste heat steam based on hydrate method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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Abstract
The invention relates to the technical field of waste heat steam utilization and sewage treatment, in particular to a sewage treatment system and a sewage treatment method based on utilization of industrial waste heat steam by a hydrate method; the system comprises a sewage evaporation system, a hydrate generation system, a hydrate decomposition system and a pipeline system; and evaporating the sewage by utilizing low-temperature waste heat to release steam, generating hydrate by the steam in a hydrate generation chamber, and decomposing the hydrate into pure water in a decomposition chamber after centrifuging. The invention provides a treatment method capable of simultaneously treating wastewater containing heavy metal ions, organic dye wastewater or organic and inorganic mixed sewage at one time. The treated sewage can reach the standard of pure water theoretically. The sewage treatment method provided by the invention can effectively reduce sewage treatment steps, improve treatment efficiency and reduce treatment cost. In addition, industrial low-temperature waste heat steam can be effectively utilized, steam emission is reduced, the difficult problems of factory sewage and energy emission are solved, and factory economic and environmental benefits are improved.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a sewage treatment system utilizing industrial waste heat steam based on a hydrate method.
Background
The first industrial revolution, human science and technology has been greatly developed, but the damage to the environment by human beings is increasingly deepened. The world is faced with three major problems of population, resources and environment, wherein water resources are an irreplaceable important resource in various resources, and the water resource problem has become one of the important problems of the great attention. Scientific researches show that the water pollution phenomenon of different degrees exists in seven water systems of China, and the water pollution treatment is indistinct.
Common water pollution comprises water eutrophication, heavy metal ion pollution, printing and dyeing wastewater pollution and the like, and common sewage treatment methods comprise biological methods, physical methods, chemical methods and the like. However, common industrial sewage often contains a large amount of different pollutants, the pollutants in the water body cannot be removed simultaneously by adopting a single treatment method, and the pollutants in the sewage can be removed by adopting a plurality of procedures and a plurality of methods to reach the emission standard. Therefore, the traditional sewage treatment method is complex in treatment procedure, time-consuming, labor-consuming and high in cost. For this reason, improvements to existing sewage treatment methods are desired.
Natural gas hydrates, commonly known as "combustible ice," are non-stoichiometric, cage-like solid crystalline materials formed by the interaction of methane and water under conditions of low temperature and high pressure. Common hydrates include SI-type, SII-type and SH-type hydrates, which differ mainly in the size of the cage structure formed by water molecules. Cyclohexane, R141b and other substances can form pure SH-type hydrate with water molecules. Wherein the water molecules form a cage-like space structure, and the cyclohexane or R141b molecules are positioned in the middle of the cage. Is coated with water molecules to form a solid crystalline material containing only cyclohexane or R141b. Formally, due to the property of the hydrate, the hydrate technology is also applied to the fields of sea water desalination, cold accumulation, gas storage and transportation and the like.
Meanwhile, a large amount of low-temperature waste heat resources are wasted in the industrial field, because the steam pressure is low and the temperature is within 100-200 ℃, the steam pressure is relatively low and cannot enter power equipment to do work so as to be effectively utilized, and meanwhile, because the production quantity of the low-temperature waste heat steam fluctuates along with the progress of a production period and the change of the steam production quantity is large, the steam can only be scattered into the air in actual production, huge energy waste is caused, the environmental pollution is indirectly aggravated, and the loss caused by the steam pressure is hundreds of millions of tons of standard coal each year. Therefore, the low-temperature waste heat steam is utilized, so that the energy conservation and environmental protection can be realized, and great economic benefits can be generated.
Aiming at the defects of the traditional sewage treatment method at present, the invention provides a novel sewage treatment system based on the utilization of industrial waste heat steam by a hydrate method by combining a hydrate technology.
Disclosure of Invention
Aiming at the problems of complicated treatment procedures, time and labor waste and high cost of the traditional sewage treatment method. The invention aims to provide a sewage treatment system based on utilizing industrial waste heat steam by a hydrate method, which reduces sewage treatment flow, improves sewage treatment efficiency and reduces sewage treatment cost.
The specific technical scheme is as follows:
a sewage treatment system based on utilizing industrial waste heat steam by a hydrate method comprises a sewage evaporation system, a hydrate generation system, a hydrate decomposition system, a low-temperature waste heat steam pipeline heat exchange system and a data acquisition and control system; the sewage evaporation system comprises a primary evaporation chamber and a secondary evaporation chamber, wherein the primary evaporation chamber is connected with a feed inlet of the secondary evaporation chamber through a high-temperature liquid pump, a water pump for controlling sewage flow is arranged at an inlet of the primary evaporation chamber, and a first temperature-pressure sensor is arranged in the primary evaporation chamber to monitor the pressure and the temperature in the primary evaporation chamber;
the hydrate generation system comprises a hydrate generation chamber, a hydrate generation agent supply tank and a raw material pump, wherein the hydrate generation chamber comprises nozzles arranged on the inner wall of the generation chamber and a stirrer positioned at the bottom; the front section of the inlet of the hydrate generation chamber is provided with an air extractor for exhausting non-condensable gas to maintain the pressure of the evaporation chamber and the pipeline;
the hydrate generation chamber is characterized in that a discharge hole of the hydrate generation chamber is connected with a centrifugal chamber, a hydrate centrifugal outlet of the centrifugal chamber is connected with a hydrate decomposition chamber, a water outlet of the centrifugal chamber is connected with the hydrate generation chamber, the bottom end of the decomposition chamber is connected with a raw material pump, a water outlet is arranged at the upper end of the decomposition chamber, and a cooling circulation is arranged in the decomposition chamber to provide cold energy for the hydrate generation chamber;
the low-temperature waste heat steam pipeline heat exchange system comprises a steam flowmeter and a steam flow control valve at an inlet section, and a first heat exchanger, a second heat exchanger and a third heat exchanger which are respectively positioned in a primary evaporation chamber, a secondary evaporation chamber and a hydrate decomposition chamber; the waste heat steam firstly enters a second heat exchanger of the secondary evaporation chamber for further heat exchange after primary heat exchange through the first heat exchanger, and then enters a water circulation pipeline again after heat exchange through a third heat exchanger of the hydrate decomposition chamber; a second temperature and pressure sensor is arranged between the second heat exchanger and the third heat exchanger to monitor the temperature and pressure of an outlet of the second heat exchanger;
the temperature and pressure sensor, the steam flowmeter, the steam control valve, the water pump and the raw material pump are all connected with the data acquisition and control system and are controlled by the computer system.
The hydrate generator in the hydrate generator supply tank is a water-insoluble hydrate generator including cyclohexane and R141b.
The pressure of the primary evaporation chamber is an air pressure value which enables the evaporation temperature of sewage in the primary evaporation chamber to be 60-80 ℃, and the corresponding air pressure value is P1; the pressure of the secondary evaporation chamber is 5-10 ℃ lower than the evaporation temperature of the sewage in the primary evaporation chamber.
The treated sewage can be inorganic sewage rich in nitrogen, phosphorus and the like, heavy metal polluted sewage, organic sewage generated by printing and dyeing and the like, or sewage mixed by various pollutants.
The method for sewage treatment system based on the hydrate method utilizing industrial waste heat steam comprises the following steps:
the first step, the sewage is subjected to precipitation and filtration treatment to remove solid particles in the sewage; maintaining the pressure in the evaporating chamber at a set vacuum degree pressure value by utilizing an air extractor, enabling treated sewage to enter a primary evaporating chamber through a water pump, then opening a steam flow control valve to enable steam to be introduced into a heat exchanger, heating the sewage through a first heat exchanger to generate steam, and conveying the generated steam to a hydrate generating chamber through a pipeline;
secondly, the sewage is subjected to primary evaporation and then enters a secondary evaporation chamber through a high-temperature liquid pump for secondary evaporation, and the generated steam is conveyed to a hydrate generation chamber through a pipeline; the generated waste is discharged through a slag discharge port;
thirdly, the generated steam enters a hydrate generation chamber and generates hydrate with a hydrate generating agent sprayed out of a nozzle at low temperature;
fourthly, the generated hydrate enters a centrifugal chamber to carry out centrifugal solid-liquid separation, the centrifuged hydrate enters a hydrate decomposition chamber to decompose, and the liquid generated by solid-liquid centrifugation enters a hydrate generation chamber again to generate hydrate;
fifthly, the centrifuged hydrate enters a hydrate decomposition chamber and is decomposed into pure water and a hydrate generating agent after being heated by a third heat exchanger; pumping the hydrate generating agent at the bottom to a hydrate generating chamber through a raw material pump for recycling, and discharging the generated pure water through a water outlet;
in the first to fifth steps, when the steam parameters change to enable the real-time temperature T of the outlet of the second heat exchanger to be more than T1, the T1 is calculated to obtain the lowest design temperature of the outlet of the second heat exchanger according to the design throughput of the hydrate decomposition chamber; the following steps are continued:
s1: starting a water pump, increasing the sewage treatment capacity in the evaporation chamber, further increasing the heat exchange capacity, and reducing the outlet temperature value of the second heat exchanger;
s2: starting an air extractor, discharging non-condensed gas, reducing the pressure in the evaporation chamber and promoting the evaporation of sewage;
s3: increasing the power of a raw material pump, increasing the supply amount of a hydrate generating agent, reducing the cooling circulation temperature, accelerating the generation of hydrate, increasing the generation amount of the hydrate, and further increasing the hydrate decomposition heat absorption capacity of a hydrate decomposition chamber;
s4: when the steps S1-S3 are adopted, the real-time temperature T is still continuously increased, so that the real-time generation amount of the hydrate is larger than Q1, and the Q1 is the maximum design generation amount of the hydrate corresponding to the full-load operation of the centrifugal chamber; starting a steam flow valve, and reducing the flow of steam in the heat exchanger until the real-time temperature T reaches the design temperature T1; wherein, the steps S1-S4 are all real-time data acquisition and are subjected to real-time regulation and control of a control system;
when the steam parameters change so that the real-time temperature T of the outlet of the second heat exchanger is less than T1, the following steps are continued:
s5: starting a steam flow valve, increasing steam flow in a pipeline, and adjusting in real time according to the collected feedback data until the steam flow valve is completely opened;
s6: after the steam flow valve is completely opened, the running power of the water pump is reduced, and the sewage entering the primary evaporation chamber is reduced;
s7: the power of the high-temperature liquid pump is reduced, and the sewage amount entering the secondary evaporation chamber is reduced; simultaneously, regulating a raw material pump to reduce the supply amount of the hydrate agent;
s8: when the real-time temperature T is continuously lower than the design temperature T1, the high-temperature liquid pump is turned off, sewage treatment is carried out only by adopting the primary evaporation chamber, and the power of the water pump is dynamically adjusted; wherein, the steps S5-S8 are all real-time data acquisition and are controlled by a control system in real time.
The temperature of the hydrate decomposition chamber is maintained above the hydrate phase equilibrium temperature; the temperature in the hydrate generation chamber is controlled below the hydrate phase equilibrium temperature.
The beneficial effects of the invention are as follows: the invention can treat sewage containing various pollutants simultaneously by using the hydrate method, effectively reduce sewage treatment steps, reduce the time required by sewage treatment, improve sewage treatment efficiency and reduce sewage treatment cost. Meanwhile, the treated sewage is close to pure water, if hydrate is generated for many times, the hydrate is decomposed for many times, even the standard of drinking water can be achieved, and water can be greatly saved. In addition, the sewage treatment based on the hydrate method can effectively utilize industrial low-temperature waste heat steam, and reduce energy and economic waste caused by steam diffusion. For factories, the production of sewage and low-temperature waste heat steam is large, and the two industrial problems can be solved simultaneously by using the hydrate method sewage treatment, so that the economic benefit of the factories is improved, and the environment is protected.
Drawings
Fig. 1 is a schematic diagram of a wastewater treatment system utilizing industrial waste heat steam based on a hydrate process.
In the figure: 1, a water pump; 2 primary evaporation chamber; a hydrate formation chamber; a 4 nozzle; 5 a stirrer; 6, a centrifugal chamber; a hydrate decomposition chamber; 8, a raw material pump; 9 a hydrate formation agent tank; 10 secondary evaporation chambers; 11 high temperature liquid pump; 21 a first heat exchanger; 22 a second heat exchanger; 23 a third heat exchanger; 31 a steam flow control valve; a 32 steam flow meter; 33 a first temperature and pressure sensor; a second temperature and pressure sensor 34; 35 computer control system.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a sewage treatment system utilizing industrial waste heat steam based on a hydrate method; the method comprises the following steps:
firstly, precipitating and filtering sewage to remove insoluble particulate matters in the sewage, opening an inlet valve of a primary evaporation chamber, starting a water pump 1 to pump the sewage into the evaporation chamber, opening a steam control valve, and introducing low-temperature waste heat steam into a heat exchanger to exchange heat with the sewage. The steam generated in the evaporating chamber enters the hydrate generating chamber through a pipeline. And the residue left after evaporation is discharged through a slag discharge port.
Starting cooling water circulation, and controlling the temperature of the hydrate generation chamber to be not higher than the phase equilibrium temperature of SII type hydrate generated by cyclopentane and R141 b; in the case of cyclopentane, the temperature is set at 2℃in order to accelerate the formation of hydrates. Simultaneously, the raw material pump 8 is started to spray cyclopentane in the hydrate generating agent supply tank into the hydrate generating chamber through the nozzle 4. The water vapor and cyclopentane form hydrates at low temperatures. At the same time, the generation of hydrate at low temperature can lead to the pressure reduction in the hydrate generation chamber, and can also lead to the pressure reduction in the evaporation chamber, thereby promoting the evaporation of sewage in the evaporation chamber. The use of agitators can promote the formation of hydrates.
The generated hydrate enters a centrifugal chamber 6 for centrifugal solid-liquid separation, the separated hydrate solid enters a hydrate decomposition chamber, and the decomposed liquid enters a hydrate generation chamber for generating hydrate. The hydrate entering the hydrate decomposition chamber is subjected to endothermic decomposition into pure water and a hydrate generating agent under the heat exchange of the third heat exchanger 23, wherein the hydrate generating agent has a higher density and is positioned at the bottom of the decomposition chamber, and the decomposed pure water is positioned above the hydrate generating agent. Pure water is discharged from the upper water outlet after decomposition, and the hydrate generating agent enters the hydrate generating chamber again through the raw material pump 8 to generate hydrate.
When the steam flow is changed and the real-time temperature T of the outlet of the second heat exchanger is more than T1, the following steps are continued:
s1: starting a water pump 1, increasing the sewage treatment capacity in the evaporation chamber, further increasing the heat exchange quantity, and reducing the outlet temperature value of the second heat exchanger;
s2: starting an air extractor, discharging non-condensed gas, reducing the pressure in the evaporation chamber and promoting the evaporation of sewage;
s3: increasing the power of the raw material pump 8, increasing the supply amount of the hydrate generating agent, reducing the cooling circulation temperature, accelerating the generation of hydrate, increasing the generation amount of the hydrate, and further increasing the hydrate decomposition heat absorption capacity of the hydrate decomposition chamber;
s4: when the step S1-3 is adopted, the real-time temperature T is still continuously increased, so that the real-time generation amount of the hydrate is larger than the maximum treatment amount Q1 of the centrifugal chamber, a steam flow valve is started, and the flow of steam in the heat exchanger is reduced until the real-time temperature T reaches the design temperature T1;
wherein, the steps S1-S4 are all real-time data acquisition and are subjected to real-time regulation and control of a control system;
when the steam parameters change so that the real-time temperature T of the outlet of the second heat exchanger is less than T1, the following steps are continued:
s5: starting a steam flow valve, increasing steam flow in a pipeline, and adjusting in real time according to the collected feedback data until the steam flow valve is completely opened;
s6: after the steam flow valve is completely opened, the running power of the water pump 1 is reduced, and the sewage entering the primary evaporation chamber is reduced;
s7: the power of the high-temperature liquid pump 11 is reduced, and the sewage amount entering the secondary evaporation chamber is reduced; at the same time, the supply amount of the hydrate agent is reduced by adjusting the raw material pump 8;
s8: when the real-time temperature T is continuously lower than the design temperature T1, the high-temperature liquid pump 11 is turned off, the primary evaporation chamber is only used for sewage treatment, and the power of the water pump 1 is dynamically adjusted;
wherein, the steps S5-S8 are all real-time data acquisition and are controlled by a control system in real time.
The above example is one of the specific embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.
Claims (5)
1. The sewage treatment system based on the hydrate method utilizing the industrial waste heat steam is characterized by comprising a sewage evaporation system, a hydrate generation system, a hydrate decomposition system, a low-temperature waste heat steam pipeline heat exchange system and a data acquisition and control system; the sewage evaporation system comprises a primary evaporation chamber (2) and a secondary evaporation chamber (10), wherein the primary evaporation chamber (2) is connected with a feed inlet of the secondary evaporation chamber (10) through a high-temperature liquid pump (11), a water pump (1) for controlling sewage flow is arranged at an inlet of the primary evaporation chamber, and a first temperature-pressure sensor (33) is arranged in the primary evaporation chamber (2) for monitoring the pressure and the temperature in the primary evaporation chamber;
the hydrate generation system comprises a hydrate generation chamber (3), a hydrate generation agent supply tank (9) and a raw material pump (8), wherein the hydrate generation chamber (3) comprises nozzles (4) arranged on the inner wall of the generation chamber and a stirrer (5) positioned at the bottom; the front section of the inlet of the hydrate generation chamber (3) is provided with an air extractor to exhaust non-condensable gas to maintain the pressure of the evaporation chamber and the pipeline;
the hydrate generation chamber discharge port is connected with the centrifugal chamber (6), the hydrate centrifugal outlet of the centrifugal chamber (6) is connected with the hydrate decomposition chamber (7), the water outlet of the centrifugal chamber (6) is connected with the hydrate generation chamber (3), the bottom end of the decomposition chamber (7) is connected with the raw material pump (8), the upper end of the decomposition chamber (7) is provided with a water outlet, and the decomposition chamber is provided with a cooling circulation to provide cold energy for the hydrate generation chamber;
the low-temperature waste heat steam pipeline heat exchange system comprises a steam flowmeter (32) and a steam flow control valve (31) at an inlet section, and a first heat exchanger (21), a second heat exchanger (22) and a third heat exchanger (23) which are respectively positioned in a primary evaporation chamber (2), a secondary evaporation chamber (10) and a hydrate decomposition chamber (7); the waste heat steam firstly enters a second heat exchanger (22) of the secondary evaporation chamber for further heat exchange after primary heat exchange through a first heat exchanger (21), and then enters a water circulation pipeline again after heat exchange through a third heat exchanger (23) of the hydrate decomposition chamber; a second temperature and pressure sensor (34) is arranged between the second heat exchanger and the third heat exchanger to monitor the temperature and pressure of the outlet of the second heat exchanger;
the temperature and pressure sensors (33) and (34), the steam flowmeter (32), the steam flow control valve (31), the water pump (1) and the raw material pump (8) are connected with the data acquisition and control system and are controlled by the computer system.
2. The system for treating sewage by utilizing industrial waste heat steam based on the hydrate method according to claim 1, wherein the hydrate generator in the hydrate generator supply tank (9) is a water-insoluble hydrate generator including cyclohexane and R141b.
3. The system for treating wastewater by utilizing industrial waste heat steam based on a hydrate method according to claim 1, wherein the pressure of the primary evaporation chamber is a gas pressure value such that the evaporation temperature of the wastewater in the primary evaporation chamber is 60-80 ℃, and the corresponding gas pressure value is P1; the pressure of the secondary evaporation chamber is 5-10 ℃ lower than the evaporation temperature of the sewage in the primary evaporation chamber.
4. A method of a sewage treatment system using industrial waste heat steam based on a hydrate method as set forth in claim 1 or 2 or 3, wherein the step of performing sewage treatment comprises:
the first step, the sewage is subjected to precipitation and filtration treatment to remove solid particles in the sewage; maintaining the pressure in the evaporating chamber at a set vacuum degree pressure value by utilizing an air extractor, enabling treated sewage to enter a primary evaporating chamber (2) through a water pump (1), then opening a steam flow control valve (31) to enable steam to be introduced into a heat exchanger, heating the sewage through a first heat exchanger (21) to generate steam, and conveying the generated steam to a hydrate generating chamber (3) through a pipeline;
secondly, sewage enters a secondary evaporation chamber (10) for secondary evaporation through a high-temperature liquid pump (11) after primary evaporation, and generated steam is conveyed to a hydrate generation chamber (3) through a pipeline; the generated waste is discharged through a slag discharge port;
thirdly, the generated steam enters a hydrate generation chamber (3) and generates hydrate with a hydrate generating agent sprayed out of a nozzle (4) at low temperature;
fourthly, the generated hydrate enters a centrifugal chamber (6) for centrifugal solid-liquid separation, the centrifuged hydrate enters a hydrate decomposition chamber (7) for decomposition, and liquid generated by solid-liquid centrifugation enters a hydrate generation chamber (3) again for generating hydrate;
fifthly, the centrifuged hydrate enters a hydrate decomposition chamber and is decomposed into pure water and a hydrate generating agent after being heated by a third heat exchanger (23); pumping the hydrate generating agent at the bottom to a hydrate generating chamber for recycling through a raw material pump (8), and discharging the generated pure water through a water outlet;
in the first to fifth steps, when the steam parameters change to enable the real-time temperature T of the outlet of the second heat exchanger to be more than T1, the T1 is calculated to obtain the lowest design temperature of the outlet of the second heat exchanger according to the design throughput of the hydrate decomposition chamber; the following steps are continued:
s1: starting a water pump (1), increasing the sewage treatment capacity in the evaporation chamber, further increasing the heat exchange quantity, and reducing the outlet temperature value of the second heat exchanger;
s2: starting an air extractor, discharging non-condensed gas, reducing the pressure in the evaporation chamber and promoting the evaporation of sewage;
s3: increasing the power of a raw material pump (8), increasing the supply amount of a hydrate generating agent, reducing the cooling circulation temperature, accelerating the generation of hydrate, increasing the generation amount of the hydrate, and further increasing the hydrate decomposition heat absorption capacity of a hydrate decomposition chamber;
s4: when the steps S1-S3 are adopted, the real-time temperature T is still continuously increased, so that the real-time generation amount of the hydrate is larger than Q1, and the Q1 is the maximum design generation amount of the hydrate corresponding to the full-load operation of the centrifugal chamber; starting a steam flow valve, and reducing the flow of steam in the heat exchanger until the real-time temperature T reaches the design temperature T1; wherein, the steps S1-S4 are all real-time data acquisition and are subjected to real-time regulation and control of a control system;
when the steam parameters change so that the real-time temperature T of the outlet of the second heat exchanger is less than T1, the following steps are continued:
s5: starting a steam flow valve, increasing steam flow in a pipeline, and adjusting in real time according to the collected feedback data until the steam flow valve is completely opened;
s6: after the steam flow valve is completely opened, the running power of the water pump (1) is reduced, and the sewage entering the primary evaporation chamber is reduced;
s7: reducing the power of the high-temperature liquid pump (11) and reducing the amount of sewage entering the secondary evaporation chamber; simultaneously, regulating a raw material pump (8) to reduce the supply amount of the hydrate agent;
s8: when the real-time temperature T is continuously lower than the design temperature T1, the high-temperature liquid pump (11) is turned off, the primary evaporation chamber is only used for sewage treatment, and the power of the water pump (1) is dynamically adjusted; wherein, the steps S5-S8 are all real-time data acquisition and are controlled by a control system in real time.
5. The method of claim 4, wherein the temperature of the hydrate decomposition chamber is maintained above the hydrate phase equilibrium temperature; the temperature in the hydrate generation chamber is controlled below the hydrate phase equilibrium temperature.
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| CN109824106A (en) * | 2019-03-18 | 2019-05-31 | 大连理工大学 | A kind of continuous seawater desalination system of normal pressure based on hydrate and its application method |
| CN210825817U (en) * | 2019-09-27 | 2020-06-23 | 大连理工大学 | Sewage treatment system utilizing industrial waste heat steam based on hydrate method |
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| FR1330681A (en) * | 1961-08-11 | 1963-06-21 | Lummus Co | Process for the formation and separation of ice crystals from an aqueous solution |
| CN109824106A (en) * | 2019-03-18 | 2019-05-31 | 大连理工大学 | A kind of continuous seawater desalination system of normal pressure based on hydrate and its application method |
| CN210825817U (en) * | 2019-09-27 | 2020-06-23 | 大连理工大学 | Sewage treatment system utilizing industrial waste heat steam based on hydrate method |
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