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CN-121972012-A - Hot fluid control film pollution device and cleaning method

CN121972012ACN 121972012 ACN121972012 ACN 121972012ACN-121972012-A

Abstract

The invention discloses a device for controlling membrane pollution by using a hot fluid and a cleaning method, which comprise a fluid heater, wherein the fluid heater is used for heating a fluid medium to 30-400 ℃, forming a gaseous hot fluid flow and conveying the gaseous hot fluid flow to a membrane component through a communication pipeline for carrying out thermal mass transfer, the membrane component is subjected to pollution inhibition and cleaning treatment on attached pollutants through the thermal action, two input ports of the fluid heater are respectively connected with a water supply pump and a gas storage tank through the communication pipeline, the gas storage tank is connected with the gas supply pump, no chemical cleaning agent is required to be added in the whole treatment and cleaning process, the membrane component is subjected to pollution inhibition or cleaning treatment on attached pollutants through hot air or hot steam, the problems of residual chemical agents and subsequent treatment and potential chemical corrosion risks on membrane materials are fundamentally avoided, and the device is particularly suitable for the food and medicine industries with extremely high requirements on cleanliness.

Inventors

  • QIAO TIEJUN
  • GUO JIANNING
  • CHEN HAO
  • JI YICHENG

Assignees

  • 深圳中清环境科技有限公司

Dates

Publication Date
20260505
Application Date
20260330

Claims (8)

  1. 1. A thermal fluid control membrane pollution device comprising: the fluid heater (1) is used for heating a fluid medium to 30-400 ℃ by the fluid heater (1), forming a gaseous hot fluid flow and conveying the gaseous hot fluid flow to the membrane assembly through the communication pipeline (5) for heat mass transfer, and carrying out pollution inhibition on the membrane assembly and cleaning treatment on attached pollutants by the heat effect; Two input ports of the fluid heater (1) are respectively connected with the water supply pump (2) and the air storage tank (4) through a communication pipeline (5), the air storage tank (4) is connected with the air supply pump (3), and an output port of the fluid heater (1) is connected with the diaphragm assembly through the communication pipeline (5) and the thermal interface.
  2. 2. A thermal fluid control membrane pollution device according to claim 1, wherein a flow meter (6) and a pressure gauge (7) are arranged in a communication pipeline (5) connected with the output port of the fluid heater (1) for monitoring the flow and pressure of the fluid medium respectively.
  3. 3. A thermal fluid control membrane fouling apparatus according to claim 2 wherein said fluid medium is a dry gas, in particular air or nitrogen, and wherein a lower heating value is required for cleaning the membrane assembly and the water supply pump (2) is shut down.
  4. 4. A thermal fluid control membrane fouling apparatus as defined in claim 2 wherein said fluid medium is hot steam, and wherein a higher heating value is required for cleaning the membrane assembly and the water supply pump (2) is turned on.
  5. 5. A thermal fluid control membrane pollution device according to claim 1, wherein said fluid heater (1) incorporates an accurate temperature control system for controlling the temperature, pressure and flow of the fluid medium.
  6. 6. A thermal fluid control membrane pollution device according to claim 5, wherein said flow heater (1) is embodied as an electric heater or a heat exchanger, and the precision temperature control system comprises a temperature sensor, a PID temperature controller and a fluid distribution device.
  7. 7. A thermal fluid control membrane fouling apparatus as defined in claim 1 wherein the temperature of said fluid medium is controllable to a temperature of 200 ℃ to 400 ℃ which does not exceed the thermal stability limit of the membrane module material.
  8. 8. A cleaning method of a thermal fluid control film contamination apparatus, applied to the thermal fluid control film contamination apparatus as recited in any one of claims 1 to 7, comprising the steps of: S1, determining the type and temperature value of fluid required for cleaning according to the heat resistance and pollutant type of the diaphragm assembly, determining the temperature of hot fluid, wherein the treatment temperature is 60-100 ℃ for biological pollution, 100-150 ℃ for organic pollution, and the highest treatment temperature can reach 400 ℃ when the high-temperature-resistant ceramic film is used; S2, setting corresponding temperature according to the fluid type determined in the S1, starting an air supply pump (3) only when the required temperature is low, introducing air into a fluid heater (1) at an initial temperature of 30-50 ℃, heating the air by using the fluid heater (1), and then raising the air temperature to a target processing temperature at a temperature raising rate of not higher than 50 ℃ per minute; When the temperature is required to be higher, an air supply pump (3) and a water supply pump (2) are started to supply air and water into the fluid heater (1), the fluid heater (1) is used for heating the water and the air to form hot steam, and then the temperature of the hot steam is increased to the target treatment temperature at the heating rate of not higher than 50 ℃ per minute; S3, distributing the fluid medium to a communication pipeline (5) through a flowmeter (6), a pressure gauge (7) and a fluid distribution device, spraying the fluid medium at the position of the diaphragm assembly, and back flushing and cleaning the diaphragm assembly from inside to outside by utilizing the fluid medium, wherein the flow rate of the sprayed fluid medium is 0.5 m/S-2 m/S, and the treatment time is 10min-60min. And S4, after the preset treatment time is reached, the system stops heating, and can cool and purge according to a program, and then the device enters a low-power-consumption standby state to wait for a next cleaning instruction.

Description

Hot fluid control film pollution device and cleaning method Technical Field The invention relates to the technical field of membrane separation devices, in particular to a device for controlling membrane pollution by a hot fluid and a cleaning method. Background The membrane separation technology is widely applied to a plurality of fields such as water treatment, food processing, biological medicine and the like, a large amount of impurities are adsorbed inside and on the surface of a filtering membrane after the membrane separation technology is used, and the impurities on the surface can be removed through a conventional back flushing process, but organic pollutants often cause irreversible pollution of the membrane, and the pollutants causing irreversible pollution of the membrane usually comprise natural organic matters adsorbed on the membrane pores or the surface of the membrane, microbial cells, extracellular secretions thereof and the like. In the prior art, chinese patent publication No. CN102101019A discloses a cleaning method of a membrane distillation assembly, which mainly utilizes traditional chemical cleaning to treat membrane pollution, including normal-temperature and high-temperature chemical cleaning, and further, as Chinese patent publication No. CN112604505A discloses a flat ceramic membrane cleaning device and a using method thereof in the prior art, the cleaning method comprises a mud scraping mechanism and a medicament recoil cleaning mechanism, and the aim of cleaning is achieved mainly by utilizing a mode of combining gas blowing and medicament flushing. In combination with the above materials, the currently mainstream cleaning methods mainly include chemical cleaning and physical cleaning, but in the actual use process, the chemical cleaning dissolves or degrades pollutants through chemical agents such as acid, alkali, oxidant or surfactant, but there is a risk of chemical agent residue, which may cause product pollution (such as food and pharmaceutical industries), and long-term use can corrode membrane materials and system pipelines, while the physical cleaning mainly relies on hydraulic shear force (such as back flushing) or mechanical force (such as sponge ball scrubbing), although there is no risk of chemical pollution, the stripping effect on refractory organic pollutants such as polymers and biological mucous membranes is limited, and the high-strength physical effect has a risk of damaging the membrane surface (particularly hollow fiber membrane), so that energy consumption is relatively high. Disclosure of Invention The invention aims to provide a device and a method for cleaning a thermal fluid control membrane, which are used for solving the problem that a membrane assembly is damaged by the traditional cleaning method in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a thermal fluid control membrane pollution device, includes fluid heater, utilizes fluid heater to heat fluid medium to 30 ℃ to 400 ℃, forms gaseous state hot fluid flow and carries to the diaphragm subassembly through the communication pipeline and carry out the thermal mass transfer, carries out pollution suppression to the diaphragm subassembly through the thermal action and carries out cleaning treatment to the pollutant that has adhered to, two input ports of fluid heater are connected with working pump and gas holder through the communication pipeline respectively, and the gas holder is connected with the working pump, and the delivery outlet of fluid heater is connected with the diaphragm subassembly through communication pipeline and thermal interface. Preferably, a flow meter and a pressure meter are arranged in a communication pipeline connected with the output port of the fluid heater and are respectively used for monitoring the flow and the pressure of the fluid medium. Preferably, the fluid medium is a dry gas, in particular air or nitrogen, and the heat value is low when the membrane assembly is cleaned, and the water supply pump is turned off. Preferably, the fluid medium is hot steam, and the heat value is required to be higher for cleaning the membrane assembly, and the water supply pump is started. Preferably, the fluid heater is internally provided with an accurate temperature control system for controlling the temperature, pressure and flow of the fluid medium. Preferably, the flow heater is specifically an electric heater or a heat exchanger, and the accurate temperature control system comprises a temperature sensor, a PID temperature controller and a fluid distribution device. Preferably, the temperature of the fluid medium is controllable to 200 ℃ to 400 ℃, which does not exceed the thermal stability limit of the diaphragm assembly material. A method for cleaning a thermal fluid control membrane pollution device, comprising the steps of: S1, determining parameters, namely determin