CN215798948U - Ultrapure water preparation device capable of providing stable TOC - Google Patents

Abstract

The utility model provides an ultrapure water preparation device for providing stable TOC, which relates to the technical field of water purification and comprises an ultrapure water preparation body, a TOC detector, a TOC eliminator and a controller which are sequentially connected; the controller is electrically connected with the TOC detector and the TOC eliminator respectively and is used for controlling the TOC eliminator to start and stop according to the detection result of the TOC detector, the TOC detector and the TOC eliminator are arranged at the rear end of the ultrapure water preparation body to eliminate the TOC in water, the TOC in water can be kept below a set value, and meanwhile, the TOC eliminator is controlled to start and stop according to the detection result of the TOC detector, so that the elimination is controlled according to needs, and unnecessary energy consumption is reduced.

Description

Ultrapure water preparation device capable of providing stable TOC

Technical Field

The utility model relates to the technical field of water purification, in particular to an ultrapure water preparation device capable of providing stable TOC.

Background

With the continuous improvement of living standard of people, more and more people begin to pay attention to water safety. At present, most users directly use tap water, but the tap water also contains a large amount of impurities, and the direct drinking of the tap water can possibly harm the health of people. The TOC content in water is an index which influences the water quality, the TOC refers to the total content of organic carbon in ultrapure water and is an important detection index, at present, a TOC eliminator is directly arranged behind most ultrapure water preparation devices to eliminate TOD in the ultrapure water, however, the TOC content in water to be treated is low, and at the moment, unnecessary waste is caused.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide an ultrapure water production apparatus which can provide a stable TOC and which can determine whether or not to activate a TOC eliminator according to the TOC content in water to be treated.

The embodiment of the utility model is realized by the following technical scheme:

an ultrapure water preparation device for providing stable TOC comprises an ultrapure water preparation body, a TOC detector, a TOC eliminator and a controller which are connected in sequence; the controller is respectively and electrically connected with the TOC detector and the TOC eliminator and is used for controlling the TOC eliminator to start and stop according to the detection result of the TOC detector.

Further, the ultrapure water preparation body comprises a pretreatment unit, a reverse osmosis unit, an EDI unit and a polishing mixed bed unit which are connected in sequence;

the reverse osmosis unit comprises a security filter, a first-stage high-pressure pump, a first-stage reverse osmosis device, a first-stage RO water tank, a second-stage high-pressure pump, a second-stage reverse osmosis device and a second-stage RO water tank which are connected in sequence;

the EDI unit comprises an EDI water supply pump, an ultraviolet sterilizer, a first precision filter, an EDI device, a desalting water tank, a pure water pump and a TOC remover which are connected in sequence; the EDI feed pump is connected with the secondary RO water tank.

Further, the pretreatment unit comprises a raw water tank, a raw water pump, a multi-media filter and an activated carbon filter which are connected in sequence, wherein the activated carbon filter is connected with the cartridge filter; the polishing mixed bed unit comprises a polishing mixed bed and a second precision filter which are sequentially connected, and the polishing mixed bed is connected with the TOC remover.

Further, ultrapure water preparation body still includes the cleaning unit, the cleaning unit is including the washing water tank, scavenging pump and the washing filter that connect gradually, the washing filter with reverse osmosis unit and EDI unit connection.

Furthermore, the ultrapure water preparation system also comprises a backwashing unit, the backwashing unit comprises a backwashing pump and a backwashing filter which are sequentially connected, and the backwashing pump is connected with the backwashing unit; the backwashing filter is a multi-media filter or an activated carbon filter.

Furthermore, a reducing agent adding device is arranged between the pretreatment unit and the reverse osmosis unit; and a scale inhibitor adding device is arranged between the pretreatment unit and the reverse osmosis unit.

Further, the TOC detector includes the base, is located the ultraviolet irradiation device of base top, is located the detection cell of base and connects the detection cell extends the shielded wire of base, the detection cell is located ultraviolet irradiation device below just is equipped with first quartz capsule and temperature sensor, the base is equipped with and holds the cavity and the intercommunication of detection cell the inlet tube and the outlet pipe of cavity, the inlet tube intercommunication ultrapure water preparation body, the outlet pipe intercommunication the TOC annihilator.

Furthermore, the base is also provided with a bottom wall, and the water inlet pipe and the water outlet pipe protrude downwards from the bottom wall; the detection tank is fixed on the bottom wall of the base and is provided with an extension part extending into the water inlet pipe and the water outlet pipe and a positioning block for fixing the first quartz tube; the temperature sensor is arranged in parallel with the first quartz tube, and one end of the temperature sensor is connected with the shielding wire; the ultraviolet irradiation device comprises a shell, a lamp holder and an ultraviolet lamp which are positioned in the shell, a silica gel piece positioned at one end of the ultraviolet lamp, and a cable which is connected with the lamp holder and extends out of the shell, wherein a capacitor is arranged on the cable.

Furthermore, the TOC eliminator comprises a shell, two ends positioned at two ends of the shell, a hoop sleeve for connecting the ends with the shell, a sealing cover arranged on the ends, and an ultraviolet lamp tube and a second quartz tube positioned in the shell, wherein one end of the two ends is provided with a water inlet for communicating the TOC detector, the other end of the two ends is provided with a water outlet, the shell is provided with a cavity and a connector penetrating through the cavity, and the connector is provided with an ultraviolet energy detector.

Furthermore, the shell extends longitudinally, the end heads are connected to two longitudinal ends of the shell, part of the end heads extends into the cavity of the shell, and other parts extend out of the cavity and are connected and matched with the sealing cover; one end of the two ends is provided with a water inlet cavity communicated with the cavity and a water inlet communicated with the water inlet cavity, the other end is provided with a water outlet cavity communicated with the cavity and a water outlet communicated with the water outlet cavity, and the outer side of the water outlet cavity is provided with a choke plug arranged on the sealing cover; the second quartz tube is lengthwise, and the ultraviolet lamp tube is arranged in the second quartz tube.

The technical scheme of the embodiment of the utility model at least has the following advantages and beneficial effects:

the utility model has reasonable design and simple structure, eliminates the TOC in water by arranging the TOC detector and the TOC eliminator at the rear end of the ultrapure water preparation body, can keep the TOC in water below a set value, and simultaneously controls the start and stop of the TOC eliminator according to the detection result of the TOC detector, realizes the elimination control according to the requirement and reduces the unnecessary energy consumption.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of an ultrapure water preparation body provided by an embodiment of the present invention;

FIG. 2 is a schematic structural view of a cleaning unit of an ultrapure water preparation body according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a backwashing unit of the ultrapure water preparation body according to the embodiment of the present invention;

FIG. 4 is a schematic diagram of a TOC detector according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a TOC canceller according to an embodiment of the present invention;

reference numerals: 1-ultrapure water preparation body, 11-pretreatment unit, 111-raw water tank, 112-raw water pump, 113-multi-media filter, 114-activated carbon filter, 12-reverse osmosis unit, 121-cartridge filter, 122-first-stage high-pressure pump, 123-first-stage reverse osmosis device, 124-first-stage RO water tank, 125-second-stage high-pressure pump, 126-second-stage reverse osmosis device, 127-second-stage RO water tank, 13-EDI unit, 131-EDI water supply pump, 132-ultraviolet sterilizer, 133-first precision filter, 134-EDI device, 135-desalted water tank, 136-pure water pump, 137-TOC remover, 14-polishing mixed bed unit, 141-polishing mixed bed, 142-second precision filter, 15-cleaning unit, 151-cleaning water tank, 152-cleaning pump, 153-cleaning filter, 16-backwashing unit, 161-backwashing pump, 162-backwashing filter, 17-reducing agent adding device, 18-antisludging agent adding device, 2-TOC detector, 21-base, 211-first bottom wall, 212-side wall, 213-cavity, 214-wire sheath, 215-water inlet pipe, 216-water outlet pipe, 22-ultraviolet irradiation device, 221-shell, 222-lamp holder, 223-ultraviolet lamp, 224-silica gel piece, 225-cable, 2251-capacitor, 226-inner cavity, 227-top wall, 228-second bottom wall, 2281-opening, 229-end wall, 23-detection pool, 231-positioning block, 232-first quartz tube, 233-temperature sensor, 234-extension part, 24-shielding wire, 241-plug, 3-TOC eliminator, 31-longitudinal shell, 311-longitudinal cavity, 312-connection port, 313-ultraviolet energy detector, 32-end, 321-water inlet cavity, 322-water inlet, 323-water outlet cavity, 324-water outlet, 325-choke plug, 33-hoop sleeve, 34-sealing cover, 35-ultraviolet lamp tube, 36-second quartz tube.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or element which is referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

The embodiment provides an ultrapure water preparation device for stabilizing TOC, which is characterized in that: comprises an ultrapure water preparation body 1, a TOC detector 2, a TOC eliminator 3 and a controller which are connected in sequence; the controller is respectively electrically connected with the TOC detector 2 and the TOC eliminator 3 and is used for controlling the TOC eliminator 3 to start and stop according to the detection result of the TOC detector 2.

Through set up TOC detector 2 and TOC annihilator 3 at ultrapure water preparation body 1 rear end, eliminate the TOC of aquatic, can keep the TOC of aquatic under the setting value, according to the testing result of TOC detector 2, control the opening of TOC annihilator 3 simultaneously, realize controlling as required and eliminate, reduce the unnecessary energy consumption.

In the present embodiment, as shown in fig. 1 to 3, the ultrapure water preparation body 1 comprises a pretreatment unit 11, a reverse osmosis unit 12, an EDI unit 13, and a polishing mixed bed 141 unit 14, which are connected in this order.

The reverse osmosis unit 12 includes a cartridge filter 121, a primary high-pressure pump 122, a primary reverse osmosis device 123, a primary RO water tank 124, a secondary high-pressure pump 125, a secondary reverse osmosis device 126, and a secondary RO water tank 127, which are connected in sequence. The secondary RO water tank 127 is connected to an EDI (Electrodeionization) water supply pump 131 of the EDI unit.

The role of the cartridge filter 121 is to trap particles larger than μm from the leakage of filter product water into the reverse osmosis unit 12.

The reverse osmosis device is the most important desalination device in the flow (the first reverse osmosis device 123 and the second reverse osmosis device 126), and the reverse osmosis membrane group with the extremely high desalination capacity is an actuating mechanism of the whole desalination system. It is mainly responsible for removing soluble salt, colloid, organic matter and microbe in water to make the water reach the requirement.

The EDI unit 13 includes an EDI water supply pump 131, an ultraviolet sterilizer 132, a first ultrafilter 133, an EDI device 134, a demineralized water tank 135, a pure water pump 136, and a TOC remover 137, which are connected in this order.

The water from the municipal water source contains dissolved salts such as sodium, calcium, magnesium, chloride, nitrate, bicarbonate, and silica. These salts consist of negatively charged ions (anion) and positively charged ions (cation). More than% of the ions can be removed by appropriate Reverse Osmosis (RO) treatment. Municipal water supplies also contain trace amounts of metals, dissolved gases (e.g., CO) and other weakly ionized compounds that must be removed during industrial use (e.g., boron and silicon).

The conductivity of the RO permeate water (EDI feed water) is typically between- μ s/cm. While the resistivity of ultrapure water or deionized water generally varies between-M Ω · cm depending on the field of application.

The operation of the EDI device 134 removes unwanted ions by exchanging hydroxyl or hydroxide ions and then passes these ions into the wastewater stream.

Further, the pretreatment unit 11 includes a raw water tank 111, a raw water pump 112, a multi-media filter 113, and an activated carbon filter 114, which are connected in sequence, and the activated carbon filter 114 is connected to a cartridge filter 121.

The raw water tank 111 plays a role in buffering and regulating water quantity, and the purpose of the raw water tank is to prevent the fluctuation of the water inlet pressure from influencing the operation of the system and ensure the safe and stable operation of the raw water pump 112.

The raw water pump 112 provides necessary power for the subsequent devices; all running states are automatically controlled by a PLC.

The multi-medium filter 113 selects refined quartz sand and anthracite as filter materials, the lighter anthracite is placed on the upper part of the filter layer, and the quartz sand is distributed in a small-particle multistage mode on the lower part of the filter layer, so that the efficiency of the whole filter layer can be fully exerted, and the pollutant interception capability is improved. The multimedia filter 113 is mainly used for removing particles, colloids, suspended matters, turbidity and the like in water, so that the turbidity of the effluent is less than NTU.

Activated carbon filter 114 is capable of forming a layer of equilibrium surface concentration on the surface of the activated carbon particles, and then adsorbing organic impurities into the activated carbon particles. The oxygen-containing functional group of the porous part of the active carbon and hypochlorite with oxidability in water are subjected to rapid oxidation and reduction reaction to remove the hypochlorite with oxidability.

Further, the polishing mixed bed 141 unit 14 includes a polishing mixed bed 141 and a second precision filter 142 connected in series.

The polishing mixed bed 141, also known as a disposable mixed bed, is generally used at the end of the process to further improve the quality of the produced water.

Further, the ultrapure water preparation system further comprises a cleaning unit 15, wherein the cleaning unit 15 comprises a cleaning water tank 151, a cleaning pump 152 and a cleaning filter 153 which are connected in sequence, and the cleaning filter 153 is connected with the reverse osmosis unit 12 and the EDI unit 13. Specifically, the cleaning unit 15 is connected to the primary reverse osmosis unit 123, the secondary reverse osmosis unit 126, and the EDI unit 134. The cleaning unit 15 is used to clean the primary reverse osmosis unit 123, the secondary reverse osmosis unit 126, and the EDI unit 134.

Further, the ultrapure water preparation system also comprises a backwashing unit 16, the backwashing unit 16 comprises a backwashing pump 161 and a backwashing filter 162 which are connected in sequence, and the backwashing pump 161 is connected with the reverse osmosis unit 12. Specifically, the backwash unit 16 is in communication with a primary reverse osmosis device 123 and a secondary reverse osmosis device 126. The backwash unit 16 is used to clean the primary reverse osmosis device 123 and the secondary reverse osmosis device 126.

Further, the backwash filter 162 is a multimedia filter 113 or an activated carbon filter 114.

Further, a reducing agent adding device 17 is arranged between the pretreatment unit 11 and the reverse osmosis unit 12. The reducing agent adding device 17 is used to add a reducing agent to the water to be treated.

Further, a scale inhibitor adding device 18 is arranged between the pretreatment unit 11 and the reverse osmosis unit 12. The scale inhibitor adding device 18 is used for adding a scale inhibitor to the water to be treated.

Further, the ultrapure water preparation system further comprises a PLC controller (not shown), and the pretreatment unit 11, the reverse osmosis unit 12, the EDI unit 13, the polishing mixed bed 141 unit 14, the cleaning unit 15 and the backwashing unit 16 are all connected with and controlled by the PLC controller. Specifically, the reducing agent adding device 17, the scale inhibitor adding device 18, the raw water tank 111, the raw water pump 112, the multi-media filter 113, the activated carbon filter 114, the cartridge filter 121, the primary high-pressure pump 122, the primary reverse osmosis device 123, the primary RO water tank 124, the secondary high-pressure pump 125, the secondary reverse osmosis device 126, the secondary RO water tank 127, the EDI water supply pump 131, the ultraviolet sterilizer 132, the first precision filter 133, the EDI device 134, the demineralized water tank 135, the pure water pump 136, the polishing mixed bed 141, the second precision filter 142, the cleaning water tank 151, the cleaning pump 152, the cleaning filter 153, the backwashing pump 161, and the backwashing filter 162 are connected to a PLC controller and controlled by the PLC controller. The PLC can realize full-automatic control, thereby reducing the failure probability of equipment, prolonging the service life of the equipment, reducing the operation cost and reducing the labor intensity.

In this embodiment, the TOC detector 2 includes a base 21, an ultraviolet irradiation device 22 disposed above the base 21, a detection cell 23 disposed in the base 21, and a shield wire 24 connected to the detection cell 23 and extending out of the base 21.

The base 21 is provided with a first bottom wall 211, a side wall 212 and a cavity 213 located inside the side wall 212 for accommodating the detection cell 23, the side wall 212 supports and fixes the ultraviolet irradiation device 22, and the cavity 213 is located at the lower side of the ultraviolet irradiation device 22. The first bottom wall 211 of the base 21 is provided with a wire protecting sleeve 214 for fixing the shielded wire 24 on the first bottom wall 211 and protecting the shielded wire 24. The base 21 is further provided with an inlet pipe 215 and an outlet pipe 216 projecting downward from the first bottom wall 211, the inlet pipe 215 and the outlet pipe 216 are communicated with the chamber 213, and the inlet pipe 215 and the outlet pipe 216 are respectively connected to the pipe of ultrapure water during operation.

The detection cell 23 is fixed on the first bottom wall 211 of the base 21, and is provided with two positioning blocks 231, a first quartz tube 232 and a temperature sensor 233 which are erected between the positioning blocks 231, and an extension portion 234 which extends into the water inlet tube 215 and the water outlet tube 216, wherein the two positioning blocks 231 are respectively arranged corresponding to the water inlet tube 215 and the water outlet tube 216. The temperature sensor 233 is disposed in parallel with the first quartz tube 232, and one end of the temperature sensor 233 is connected to the shielding wire 24, the first quartz tube 232 is preferably of a high ozone type, the positioning block 231 is an end cap, and the material thereof is preferably ABS. The end of the shielded wire 24 is provided with a plug 241. Preferably, a temperature sensor 233 is located in the detection tank 23 for monitoring the temperature of the water body in the current tank in real time.

The ultraviolet irradiation device 22 includes a housing 221, a lamp holder 222 and an ultraviolet lamp 223 located in the housing 221, a silicone member 224 located at one end of the ultraviolet lamp 223, and a cable 225 connected to the lamp holder 222 and extending out of the housing 221. An inner cavity 226 for accommodating the lamp holder 222, the ultraviolet lamp 223 and the silica gel piece 224 is arranged in the casing 221, the ultraviolet lamp 223 is positioned between the lamp holder 222 and the silica gel piece 224, in order to enable the light of the ultraviolet lamp 223 to irradiate the detection cell 23, the casing 221 of the utility model is provided with a top wall 227 and a second bottom wall 228 which are positioned at two sides of the inner cavity 226 and an end wall 229 for connecting the top wall 227 and the second bottom wall 228, the second bottom wall 228 of the casing 221 is provided with an opening 2281 which is arranged corresponding to the ultraviolet lamp 223, the ultraviolet light can irradiate the detection cell 23 through the opening 2281, the end wall 229 of the casing 221 is provided with a wire protection sleeve 214 which is sleeved on the cable 225, and the cable 225 is provided with a capacitor 2251 which is matched with the ultraviolet lamp 223.

This TOC detector 2 passes through temperature sensor 233 and realizes the detection to detecting cell 23 temperature, provides the basis for temperature compensation to the difference of measuring sample resistivity before ultraviolet oxidation before and after realizes the testing process to TOC content under this prerequisite, and whole device simple structure, convenient operation, and the interference killing feature is strong, and the testing result is very reliable and stable.

In this embodiment, the TOC eliminator 3 comprises an elongated housing 31, two terminals 32 at two longitudinal ends of the housing, a hoop 33 connecting the terminals 32 and the housing, a cap 34 mounted at the end of the terminals 32, and an ultraviolet lamp 35 and a second quartz tube 36 in the housing.

The shell extends longitudinally and is internally provided with a longitudinal cavity 311 for accommodating the ultraviolet lamp tube 35 and the second quartz tube 36, the shell is provided with a connecting port 312 which runs through the cavity 213, and the connecting port 312 is provided with an ultraviolet energy detector 313 for detecting the ultraviolet energy of the water body in the cavity 213.

The terminals 32 are connected to the two longitudinal ends of the housing, and partially extend into the cavity 213 of the housing, and partially protrude out of the cavity 213 and are connected and matched with the cover 34. One end head 32 of the two end heads 32 is provided with a water inlet cavity 321 communicated with the cavity 213 and a water inlet 322 communicated with the water inlet cavity 321, the other end head 32 is provided with a water outlet cavity 323 communicated with the cavity 213 and a water outlet 324 communicated with the water outlet cavity 323, and the outer side of the water outlet cavity 323 is provided with a bulkhead 325 arranged on the sealing cover 34, so that the sealing function is realized.

The second quartz tube 36 is lengthwise-shaped, is installed in the housing, and is fixed at both longitudinal ends thereof by the two side covers 34 to prevent coming-off; the ultraviolet lamp tube 35 is arranged in the second quartz tube 36 and can be taken out freely; the ultraviolet energy detector 313 is mounted on the housing by a screw connection.

Preferably, the cover 34, the end 32 and the hoop housing 33 are all injection molded by using anti-ultraviolet materials. The shell is made of high-purity stainless steel. The bulkhead 325 is injection molded from an elastomeric material. The second quartz tube 36 is a high-purity high ultraviolet-transmitting second quartz tube 36, and the ultraviolet lamp tube 35 is a high ozone type lamp tube.

In operation, water enters the second quartz tube 36 and the shell from the water inlet 322 at one end of the shell, ultraviolet light is emitted in the cavity 213 through the ultraviolet lamp tube 35 to irradiate the water in the cavity 213 to generate high-concentration ozone, TOC components in the water are digested by the ozone, and finally the water flows out from the water outlet 324 at the other end 32 of the shell. In the process, the ultraviolet energy detector 313 is used for monitoring the ultraviolet irradiation intensity emitted by the ultraviolet lamp 35 in real time, so as to check the working effectiveness of the eliminating device.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An ultrapure water preparation device for providing stable TOC is characterized in that: comprises an ultrapure water preparation body, a TOC detector, a TOC eliminator and a controller which are connected in sequence; the controller is respectively and electrically connected with the TOC detector and the TOC eliminator and is used for controlling the TOC eliminator to start and stop according to the detection result of the TOC detector.

2. The apparatus for preparing ultrapure water for stable TOC according to claim 1, wherein: the ultrapure water preparation body comprises a pretreatment unit, a reverse osmosis unit, an EDI unit and a polishing mixed bed unit which are connected in sequence;

the reverse osmosis unit comprises a security filter, a first-stage high-pressure pump, a first-stage reverse osmosis device, a first-stage RO water tank, a second-stage high-pressure pump, a second-stage reverse osmosis device and a second-stage RO water tank which are connected in sequence;

the EDI unit comprises an EDI water supply pump, an ultraviolet sterilizer, a first precision filter, an EDI device, a desalting water tank, a pure water pump and a TOC remover which are connected in sequence; the EDI feed pump is connected with the secondary RO water tank.

3. The apparatus for preparing ultrapure water for stable TOC according to claim 2, wherein: the pretreatment unit comprises a raw water tank, a raw water pump, a multi-media filter and an activated carbon filter which are connected in sequence, and the activated carbon filter is connected with the security filter; the polishing mixed bed unit comprises a polishing mixed bed and a second precision filter which are sequentially connected, and the polishing mixed bed is connected with the TOC remover.

4. The apparatus for preparing ultrapure water for stable TOC according to claim 2, wherein: ultrapure water preparation body still includes the cleaning unit, the cleaning unit is including the washing water tank, scavenging pump and the washing filter that connect gradually, the washing filter with reverse osmosis unit and EDI unit connect.

5. The apparatus for preparing ultrapure water for stable TOC according to claim 2, wherein: the ultrapure water preparation system also comprises a backwashing unit, the backwashing unit comprises a backwashing pump and a backwashing filter which are sequentially connected, and the backwashing pump is connected with the backwashing unit; the backwashing filter is a multi-media filter or an activated carbon filter.

6. The apparatus for preparing ultrapure water for stable TOC according to claim 2, wherein: a reducing agent adding device is arranged between the pretreatment unit and the reverse osmosis unit; and a scale inhibitor adding device is arranged between the pretreatment unit and the reverse osmosis unit.

7. The apparatus for preparing ultrapure water for stable TOC according to claim 1, wherein: the TOC detector includes the base, is located the ultraviolet irradiation device of base top, is located the detection cell of base and connects the detection cell extends the shielded wire of base, the detection cell is located ultraviolet irradiation device below just is equipped with first quartz capsule and temperature sensor, the base is equipped with and holds the cavity and the intercommunication of detection cell the inlet tube and the outlet pipe of cavity, the inlet tube intercommunication ultrapure water preparation body, the outlet pipe intercommunication the TOC annihilator.

8. The apparatus for preparing ultrapure water for stable TOC according to claim 7, wherein: the base is also provided with a bottom wall, and the water inlet pipe and the water outlet pipe protrude downwards from the bottom wall; the detection tank is fixed on the bottom wall of the base and is provided with an extension part extending into the water inlet pipe and the water outlet pipe and a positioning block for fixing the first quartz tube; the temperature sensor is arranged in parallel with the first quartz tube, and one end of the temperature sensor is connected with the shielding wire; the ultraviolet irradiation device comprises a shell, a lamp holder and an ultraviolet lamp which are positioned in the shell, a silica gel piece positioned at one end of the ultraviolet lamp, and a cable which is connected with the lamp holder and extends out of the shell, wherein a capacitor is arranged on the cable.

9. The apparatus for preparing ultrapure water for stable TOC according to claim 1, wherein: the TOC eliminator comprises a shell, two ends positioned at two ends of the shell, a hoop sleeve for connecting the ends with the shell, a sealing cover arranged on the ends, and an ultraviolet lamp tube and a second quartz tube positioned in the shell, wherein one end of the two ends is provided with a water inlet for communicating with the TOC detector, the other end of the two ends is provided with a water outlet, the shell is provided with a cavity and a connector penetrating through the cavity, and the connector is provided with an ultraviolet energy detector.

10. The apparatus for preparing ultrapure water for stable TOC according to claim 9, wherein: the shell extends longitudinally, the end heads are connected to two longitudinal ends of the shell, part of the end heads extends into the cavity of the shell, and other parts extend out of the cavity and are connected and matched with the sealing cover; one end of the two ends is provided with a water inlet cavity communicated with the cavity and a water inlet communicated with the water inlet cavity, the other end is provided with a water outlet cavity communicated with the cavity and a water outlet communicated with the water outlet cavity, and the outer side of the water outlet cavity is provided with a choke plug arranged on the sealing cover; the second quartz tube is lengthwise, and the ultraviolet lamp tube is arranged in the second quartz tube.

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