CN114588843A - Chlorine dioxide preparation device for drinking water disinfection - Google Patents
Chlorine dioxide preparation device for drinking water disinfection Download PDFInfo
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- CN114588843A CN114588843A CN202210382118.XA CN202210382118A CN114588843A CN 114588843 A CN114588843 A CN 114588843A CN 202210382118 A CN202210382118 A CN 202210382118A CN 114588843 A CN114588843 A CN 114588843A
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- chlorine dioxide
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- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000004155 Chlorine dioxide Substances 0.000 title claims abstract description 41
- 235000019398 chlorine dioxide Nutrition 0.000 title claims abstract description 41
- 239000003651 drinking water Substances 0.000 title claims abstract description 26
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 26
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 212
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
- 239000000645 desinfectant Substances 0.000 claims abstract description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 34
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 claims description 23
- 229960002218 sodium chlorite Drugs 0.000 claims description 23
- 239000007864 aqueous solution Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 8
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 238000000034 method Methods 0.000 description 5
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- -1 chlorate ions Chemical class 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 206010043275 Teratogenicity Diseases 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-M chlorate Inorganic materials [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 230000007886 mutagenicity Effects 0.000 description 1
- 231100000299 mutagenicity Toxicity 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 231100000211 teratogenicity Toxicity 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/008—Feed or outlet control devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J7/00—Apparatus for generating gases
- B01J7/02—Apparatus for generating gases by wet methods
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/02—Oxides of chlorine
- C01B11/022—Chlorine dioxide (ClO2)
- C01B11/023—Preparation from chlorites or chlorates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/02—Oxides of chlorine
- C01B11/022—Chlorine dioxide (ClO2)
- C01B11/023—Preparation from chlorites or chlorates
- C01B11/024—Preparation from chlorites or chlorates from chlorites
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2204/00—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices
- B01J2204/002—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices the feeding side being of particular interest
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a chlorine dioxide preparation device for drinking water disinfection, which comprises a raw material A adding unit, a raw material B adding unit, a reaction kettle and a control device, wherein the raw material A adding unit and the raw material B adding unit respectively comprise a raw material barrel, a connecting pipeline and a metering pump; the raw material barrel is of a closed structure, and a liquid level meter and a one-way air inlet valve are arranged on the raw material barrel; the control device controls the metering pumps to work, and adjusts the flow rates of the corresponding metering pumps in real time according to the liquid level values detected by the liquid level meters in real time, so that the raw materials A and B are added into the reaction kettle according to a set proportion; chlorine dioxide generated by reaction in the reaction kettle and reaction residual liquid are put into the drinking water body to be disinfected in real time in the form of disinfectant. The invention has simple structure, reliable work and low requirement on working environment, and creates conditions for applying chlorine dioxide to drinking water disinfection of small water occasions such as villages or communities.
Description
Technical Field
The invention relates to a chlorine dioxide preparation device for drinking water disinfection.
Background
In order to prevent the pollution of pathogenic microorganisms such as viruses, bacteria, pathogens, protozoa and the like to drinking water and ensure the water supply safety, the disinfection becomes an important link of the water supply treatment process.
In the past, chlorine disinfection has been widely used in water treatment processes, but since Trihalomethanes (THMs), haloacetic acids (HAAS), etc., which are byproducts of chlorine disinfection, are all "causing" substances (cancer, teratogenicity, and mutagenicity), people have begun to limit the content of Disinfection Byproducts (DBPs), even prohibited from using liquid chlorine disinfection. Chlorine dioxide, as an excellent disinfectant, has not only broad-spectrum bactericidal activity and better disinfection effect on drinking water than liquid chlorine, but also does not generate harmful halogenated organic substances in the process of purifying water, and thus is considered to be an ideal disinfectant capable of replacing liquid chlorine. However, since chlorine dioxide is unstable, highly corrosive, difficult to store and transport, and requires on-site preparation and use, development of a chlorine dioxide generator capable of long-term automatic stable operation, particularly an unattended chlorine dioxide generator suitable for small-sized water supply places such as villages and communities, has been a prerequisite for application of chlorine dioxide to drinking water disinfection.
Disclosure of Invention
Aiming at the requirements in the prior art, the invention aims to provide a device for preparing chlorine dioxide for disinfecting drinking water, which is suitable for small water supply occasions.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a chlorine dioxide preparation device for drinking water disinfection comprises a raw material A adding unit, a raw material B adding unit, a reaction kettle and a control device, wherein the raw material A adding unit and the raw material B adding unit respectively comprise a raw material barrel, a connecting pipeline and a metering pump, and the metering pump sucks raw materials in the raw material barrel through the connecting pipeline and conveys the raw materials to the reaction kettle; the raw material barrel is of a closed structure, a liquid level meter and a one-way air inlet valve are arranged on the raw material barrel, the liquid level meter is used for detecting the liquid level of the raw material in the raw material barrel in real time, and the one-way air inlet valve is used for balancing the internal pressure and the external pressure of the raw material barrel; the control device controls the metering pumps to work, compares the adding amounts of the raw materials A and B in real time according to the liquid level values detected by the two liquid level meters in real time, and adjusts the flow rate of at least one metering pump in real time so as to enable the raw materials A and B to be added into the reaction kettle according to a set proportion; the raw material A is a sodium chlorate aqueous solution or a sodium chlorite aqueous solution, and the raw material B is hydrochloric acid; chlorine dioxide generated by reaction in the reaction kettle and reaction residual liquid are put into the drinking water body to be disinfected in real time in the form of disinfectant.
Further, the metering pump is a diaphragm metering pump, and the control device adjusts the flow rate of the metering pump by adjusting the working frequency of the metering pump, so that the raw material A and the raw material B are added according to a set proportion.
Further, the control device adjusts the flow rate of the metering pump corresponding to the raw material with a high liquid level value by increasing the working frequency of the metering pump, so that the raw material A and the raw material B are added according to a set proportion; or the flow rate of the raw material A and the raw material B is adjusted by reducing the working frequency of the metering pump corresponding to the raw material with a low liquid level value, so that the raw material A and the raw material B are added according to a set proportion; or the flow rates of the two metering pumps are adjusted by reducing the working frequency of the metering pump corresponding to the raw material with the low liquid level value and simultaneously increasing the working frequency of the metering pump corresponding to the raw material with the high liquid level value, so that the raw material A and the raw material B are added according to a set proportion.
Further, the raw material A is a sodium chlorite aqueous solution, the raw material A and the raw material B are contained in raw material barrels with the same shape and specification, the raw material A and the raw material B are added according to the volume ratio of 1:1, and the initial liquid level values of the two raw materials are the same; and the control device compares the level values of the two raw materials in real time and adjusts the working frequency of the metering pump corresponding to the raw material with the high level value in real time so as to feed the raw material A and the raw material B according to a set proportion.
Further, the raw material A is a sodium chlorite aqueous solution with the concentration of 7% -8%, and the concentration of the hydrochloric acid is 8% -9%.
Further, the raw material A is a sodium chlorite aqueous solution with the concentration of 8%, and the concentration of the hydrochloric acid is 9%.
Further, the control device sends out an alarm signal of abnormal raw material feeding when the difference value of the liquid level values of the raw materials A and B is up to an abnormal set value, and stops the work of the two metering pumps and sends out a shutdown alarm signal when the liquid level difference value further reaches a shutdown set value.
Further, the control device is preset with a raw material residual value, and sends a raw material supplementing alarm signal when the liquid level value of one or two raw materials drops to the raw material residual value; the control device is also provided with a material shortage level value, and when the liquid level meter detects that the level value of one or two raw materials drops to the material shortage level value, the control device stops the work of the two metering pumps and sends a material shortage alarm signal.
Furthermore, the control device is provided with a wireless transmitting module and is connected with the remote control center through the wireless transmitting module and a wireless network.
Furthermore, the liquid level meter is an ultrasonic liquid level meter or a floating ball type liquid level meter, a liquid suction pipeline of the metering pump is inserted in the raw material barrel, a one-way valve is arranged at the inlet end of the liquid suction pipeline, and a back pressure valve is arranged on the output pipeline of the metering pump.
The chlorine dioxide generated by the reaction and the reaction residual liquid are put into a water body to be treated in real time in the form of a disinfectant, if the adding amount of sodium chlorate or sodium chlorite exceeds a set proportion, the conversion rate of the chlorine dioxide is reduced, too much chlorate ions or chlorite ions enter the water body to threaten the water safety, if the adding amount of the sodium chlorate or sodium chlorite is lower than the set proportion, the insufficient amount of the chlorine dioxide put into the water body is caused, and too much hydrochloric acid enters the water body, so that the two raw materials are ensured to be added according to the set proportion to become the primary control indexes of the chlorine dioxide preparation device. The invention ensures that the two raw materials are added according to the set proportion by comparing the adding amount of the two raw materials in real time and adjusting the adding amount of the two raw materials in real time, and provides technical guarantee for the safe use of the chlorine dioxide preparation device in the disinfection treatment of drinking water.
For small water-using occasions such as villages or communities, the amount of chlorine dioxide required for drinking water disinfection is small, correspondingly, the flow specification of a metering pump used in a preparation device is small, the inner diameter of a used connecting pipeline is small and is usually only 3-6mm, an ideal pure liquid is not always in a raw material barrel, a small amount of solid impurities sometimes exist in the pure liquid, sodium chlorate and sodium chlorite crystals can slowly appear on the inner wall of a sodium chlorate and sodium chlorite feeding pipeline and on a diaphragm and the inner wall of an inlet and an outlet of a metering pump along with work, and bubbles can also appear in a pipeline of a hydrochloric acid feeding unit along with seasonal changes, so that the resistance of a flow channel can be increased and even the flow channel is blocked to prevent the normal feeding of raw materials no matter whether the solid impurities are sucked into the flow channel or the crystals and the bubbles appear in the flow channel. In the prior art, although some high-end metering pumps can be provided with an output feedback device to ensure accurate metering, the high-end metering pumps are expensive and are several times of common metering pumps, and in addition, the use conditions are harsh, auxiliary devices need to be equipped, and the cost of the whole machine is greatly increased. The invention controls the feeding of the raw materials by directly detecting the liquid level value of the raw materials, thereby not only ensuring the truth and reliability of the detection data and the fixed proportion feeding of the two raw materials, but also ensuring that the preparation device has simple structure, improving the working reliability of the equipment and reducing the requirements on the working environment conditions.
The reaction speed and the yield of the chlorine dioxide of the two raw materials are closely related to the concentration and the adding proportion of the raw material solution, 7-8% of sodium chlorite aqueous solution and 8-9% of hydrochloric acid are used as raw materials and added according to the volume ratio of 1:1, so that the two raw materials can react quickly and fully, the yield of more than 95% is obtained, the continuous operation of the production of the chlorine dioxide is realized, and the continuous disinfection of the flowing water body is realized. On this basis, utilize the former storage bucket splendid attire raw materials of the same specification, the follow-up replenishment of two kinds of raw materialss not only of being convenient for, the inspection personnel of being convenient for throw the visual observation of throwing the situation to the raw materials, also make controlling means can directly obtain the input volume of raw materials from raw materials liquid level value, simplified controlling means's working procedure for equipment operation is more reliable and more stable.
Set up the back pressure valve on the output line of measuring pump not only can eliminate the influence of low reaches pressure fluctuation to the stable work of measuring pump, moreover, can prevent the emergence of the siphonage of the raw materials quilt suction water body in the raw materials bucket under the circumstances of measuring pump stop work. The one-way valve is arranged at the inlet of the liquid pumping pipeline of the metering pump, so that raw materials in the metering pump and the pipeline can be prevented from flowing back to the raw material barrel, and the metering pump and the back pressure valve are used for filling the metering pump and the pipelines at the upstream and the downstream of the metering pump with raw material solution all the time under the condition that the metering pump stops working, so that the precipitation of sodium chlorate or sodium chlorite is delayed.
A chlorine dioxide preparation facilities for drinking water disinfection of village or community installs in unmanned on duty's environment usually, utilizes wireless transmitting module to link to each other it with remote control center, can make things convenient for the staff greatly to control a plurality of chlorine dioxide preparation facilities that distribute at the multiple spot, knows the operating condition of device in real time, in time changes adjusting device's operating parameter according to the water supply condition, in time discharges trouble, supplements the raw materials.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: 1 former storage bucket one, 2 former storage bucket two, 3 reation kettle, 4 measuring pump one, 5 measuring pump two, 6 floater formula level gauge, 6.1 level gauge body of rod, 6.2 level gauge floater, 7 one-way admission valve, 8 check valves, 9 back pressure valves, 10 raw materials bung.
Detailed Description
The present invention will be described with reference to examples.
Fig. 1 shows an example of a chlorine dioxide preparing apparatus for sterilizing drinking water according to the present invention.
As shown in the figure, the chlorine dioxide preparation apparatus for drinking water disinfection in this example includes a reaction vessel 3, a raw material a adding unit located at the left side of the reaction vessel 3, a raw material B adding unit located at the right side of the reaction vessel 3, and a control apparatus (not shown in the figure); the raw material A adding unit comprises a raw material barrel 1, a metering pump 4 and a connecting pipeline at the upstream and downstream, a liquid suction pipe at the inlet side of the metering pump 4 is inserted in the raw material barrel 1, a one-way valve 8 is arranged at the inlet of the raw material barrel, a back pressure valve 9 is arranged on the connecting pipeline at the outlet side of the metering pump 4, the raw material A is contained in the raw material barrel 1, the metering pump 4 sucks the raw material A in the raw material barrel 1 and conveys the raw material A to the reaction kettle 3 along the direction indicated by the arrow at the left side in the upper part of the figure, the raw material barrel 1 is of a closed structure, a floating ball type liquid level meter 6 is inserted on the top wall of the raw material barrel, a floating ball 6.2 of the liquid level meter floats on the liquid level of the raw material A and moves along a rod body 6.1 of the liquid level meter along with the lifting of the liquid level, a one-way air inlet valve 7 and a raw material barrel cover 10 are also arranged on the top wall of the raw material barrel 1, the liquid level meter 6 is used for detecting the liquid level of the raw material A in real time and transmitting a detection signal to a control device, when the liquid level of the raw material A is lowered, external air enters the raw material barrel I1 through the one-way air inlet valve 7, so that the internal pressure and the external pressure of the raw material barrel I1 are kept balanced; the structure of the raw material B adding unit is the same as that of the raw material A adding unit, the shape and the specification of the raw material barrel II 2 are the same as those of the raw material barrel I1, and the metering pump II 5 sucks the raw material B in the raw material barrel II 2 and conveys the raw material B to the reaction kettle 3 along the direction indicated by an arrow at the upper right side in the figure; the control device controls the first metering pump 4 and the second metering pump 5 to work, and adjusts the working frequency of the first metering pump 4 and the second metering pump 5 in real time according to the liquid level values of the raw materials A and B detected by the liquid level meter 6 in real time, so that the raw materials A and B are added into the reaction kettle 3 according to a set proportion.
The reaction kettle 3 is tubular with end walls at two ends and is vertically arranged, a raw material input port is arranged on the upper end wall of the reaction kettle 3, a disinfectant output port is arranged on the lower end wall of the reaction kettle, feeding pipelines of the raw materials A and B are connected with an input pipeline of the reaction kettle 3 through a tee joint above the reaction kettle 3, and an output port at the lower end of the reaction kettle 3 is connected with a disinfectant feeding port of a drinking water supply pipeline through a pipeline (not shown in the figure).
Raw material A and raw material B are crossed above reaction kettle 3 through a tee joint and then input into reaction kettle 3, so that the reaction kettle adopting a vertically arranged simple tubular structure can enable the two raw materials to complete reaction along with downward flow and form required disinfectant at the lower end of the reaction kettle.
The capacity of the raw material barrel is 100 liters, wherein the raw material A in the raw material barrel I1 is a sodium chlorite aqueous solution with the concentration of 8%, the raw material B in the raw material barrel II 2 is hydrochloric acid with the concentration of 9%, and the metering pump I4 and the metering pump II 5 are diaphragm metering pumps.
When the device works, firstly, sodium chlorite aqueous solution and hydrochloric acid with the same volume are respectively added into two raw material barrels, then the dosage of chlorine dioxide is determined according to the drinking water condition, the dosage of the sodium chlorite and the hydrochloric acid is calculated according to the dosage of the chlorine dioxide, the working frequency of a first metering pump 4 and a second metering pump 5 is set through a control device according to the dosage, then the two metering pumps are started, the sodium chlorite aqueous solution and the hydrochloric acid are added into a reaction kettle 3 according to the volume ratio of 1:1 and react in the reaction kettle 3 to generate the chlorine dioxide, the chlorine dioxide is instantly dissolved in reaction residual liquid to form disinfectant, the disinfectant is added into a drinking water body from a lower end outlet (see an arrow below the reaction kettle 3 in the figure) of the reaction kettle 3 through a pipeline, and the disinfectant is continuously output along with the continuous addition of the raw materials, so that the disinfection treatment of the drinking water is realized.
Along with the work of the preparation device, the sodium chlorite aqueous solution in the raw material barrel I1 and the hydrochloric acid in the raw material barrel II 2 are continuously consumed, when the liquid level meter 6 detects that the liquid level value of one or two raw materials is reduced to a set raw material residual value, the control device sends a raw material supplementing alarm signal to inform a manager of supplementing the raw materials in time so as to avoid influencing the normal disinfection of the drinking water body. When the manager fails to supplement the raw materials in time, the level value of one or two raw materials is lowered to the material shortage level value, the raw materials are indicated to be used up, the control device stops the work of the two metering pumps, and a material shortage alarm signal is sent out.
In the working process, the two liquid level meters 6 detect the liquid level values of the two raw materials in real time and transmit the detection result to the control device, the control device compares the liquid level values of the two raw materials in real time, when the difference value occurs between the two liquid level values, the adding amount of one raw material is lower than the amount required by the set proportion, and the control device can improve the adding amount of the corresponding raw material by improving the working frequency of the metering pump of the adding unit with small adding amount, so that the two raw materials are added according to the set proportion.
In practice, when the level values of the two raw materials are different, the dosage of one raw material is usually reduced, so that the working frequency of the metering pump with small dosage is only required to be increased, and the working frequency of the other metering pump is kept unchanged. In addition, the feeding of the two raw materials can be kept at a set proportion by reducing the working frequency of the metering pump with large feeding amount, and the working frequencies of the two metering pumps can be simultaneously adjusted to restore the feeding of the two raw materials to the set proportion. Of course, whether the working frequency of the metering pump is increased or decreased, the dosage of the raw materials should be kept within a range that can effectively sterilize the water body.
Under the condition that a flow channel of a certain raw material adding unit is too large in resistance or blocked (the flow channel of a sodium chlorite adding unit is blocked generally) or a metering pump cannot work normally, even if the adding amount of the raw materials is adjusted by a control device, the difference value of the liquid level values of the two raw materials can be expanded continuously, when the difference value of the liquid level values of the two raw materials reaches an abnormal set value, the control device sends an alarm signal indicating that the raw materials with high liquid level values cannot be added normally, when the difference value of the liquid level values of the two raw materials further reaches a shutdown set value, the control device stops the work of the two metering pumps to prevent a single raw material from being added into a drinking water body, and sends a fault shutdown alarm signal to inform a manager to remove faults in time.
Although the two raw materials are contained in the raw material barrels with the same shape and specification, the liquid level values of the two raw materials are the same, and the control device can directly compare the two liquid level values, the actual comparison is about the adding amount of the raw materials, so that the two raw materials can be contained in different raw material barrels.
8 percent and 9 percent are the optimal matching concentrations of the sodium chlorite aqueous solution and the hydrochloric acid, in actual use, when the addition is carried out at the volume ratio of 1:1, the concentration of the sodium chlorite aqueous solution is selected within the range of 7-8 percent, and the concentration of the hydrochloric acid is selected within the range of 8-9 percent, so that the rapid and sufficient reaction of the sodium chlorite aqueous solution and the hydrochloric acid can be ensured, and the conversion rate of the chlorine dioxide of more than 95 percent can be obtained.
The drinking water disinfection equipment of small-size water occasion has numerous, the characteristics of position dispersion, equipment provider can not be equipped with special maintainer for every equipment, require equipment user to be equipped with special managers and then can increase running cost and personnel extravagant, therefore, can set up wireless emission module for chlorine dioxide preparation facilities, utilize wireless emission module and public wireless network to link to each other it with remote control center, construct the thing allies oneself with the system of centralized management, can arrange the work of a small amount of managers management and control an area's equipment like this, in time supply the raw materials to equipment, in time discover the trouble and get rid of the trouble, in time adjust equipment working parameter according to seasonal variation, can also utilize hierarchical management to make relevant personnel in time know the running state of equipment through wireless device such as cell-phones.
The liquid level meter in the above example is a floating ball type liquid level meter, and the metering pump is a diaphragm type metering pump, and besides, various suitable liquid level meters such as an ultrasonic liquid level meter and various known suitable metering pumps may be used.
Finally, it should be pointed out that besides the above examples, there may be many other embodiments of the invention, which can be made by those skilled in the art, and the above examples are only used for illustration and do not limit the scope of the invention.
Claims (10)
1. The chlorine dioxide preparation device for drinking water disinfection is characterized by comprising a raw material A adding unit, a raw material B adding unit, a reaction kettle and a control device, wherein the raw material A adding unit and the raw material B adding unit respectively comprise a raw material barrel, a connecting pipeline and a metering pump, and the metering pump sucks raw materials in the raw material barrel through the connecting pipeline and conveys the raw materials to the reaction kettle; the raw material barrel is of a closed structure, a liquid level meter and a one-way air inlet valve are arranged on the raw material barrel, the liquid level meter is used for detecting the liquid level of the raw material in the raw material barrel in real time, and the one-way air inlet valve is used for balancing the internal pressure and the external pressure of the raw material barrel; the control device controls the metering pumps to work, compares the adding amounts of the raw materials A and B in real time according to the liquid level values detected by the two liquid level meters in real time, and adjusts the flow rate of at least one metering pump in real time so as to enable the raw materials A and B to be added into the reaction kettle according to a set proportion; the raw material A is a sodium chlorate aqueous solution or a sodium chlorite aqueous solution, and the raw material B is hydrochloric acid; chlorine dioxide generated by reaction in the reaction kettle and reaction residual liquid are put into the drinking water body to be disinfected in real time in the form of disinfectant.
2. The apparatus for preparing chlorine dioxide as claimed in claim 1, wherein the metering pump is a diaphragm metering pump, and the control device adjusts the flow rate of the metering pump by adjusting the working frequency of the metering pump, so that the raw material A and the raw material B are added according to a set proportion.
3. The apparatus for preparing chlorine dioxide as claimed in claim 2, wherein the control device adjusts the flow rate of the raw material A and the raw material B by increasing the working frequency of the metering pump corresponding to the raw material with a high liquid level value, so that the raw material A and the raw material B are added according to a set proportion; or the flow rate of the raw material A and the raw material B is adjusted by reducing the working frequency of the metering pump corresponding to the raw material with a low liquid level value, so that the raw material A and the raw material B are added according to a set proportion; or the flow rates of the two metering pumps are adjusted by reducing the working frequency of the metering pump corresponding to the raw material with the low liquid level value and simultaneously increasing the working frequency of the metering pump corresponding to the raw material with the high liquid level value, so that the raw material A and the raw material B are added according to a set proportion.
4. The apparatus for preparing chlorine dioxide as claimed in claim 2, wherein the raw material A is sodium chlorite aqueous solution, the raw material A and the raw material B are contained in raw material barrels with the same shape and specification, the raw material A and the raw material B are added according to the volume ratio of 1:1, and the initial liquid level values of the two raw materials are the same; and the control device compares the level values of the two raw materials in real time and adjusts the working frequency of the metering pump corresponding to the raw material with the high level value in real time so as to feed the raw material A and the raw material B according to a set proportion.
5. The apparatus according to claim 4, wherein said feedstock A is an aqueous solution of sodium chlorite having a concentration of 7% to 8%, and said hydrochloric acid has a concentration of 8% to 9%.
6. The apparatus according to claim 4, wherein said raw material A is an aqueous solution of sodium chlorite having a concentration of 8% and said hydrochloric acid has a concentration of 9%.
7. The apparatus for preparing chlorine dioxide as claimed in claim 4, wherein said control means sends out an alarm signal of abnormal addition of raw material when the difference between the liquid level values of raw material A and raw material B reaches an abnormal set value, and stops the operation of two said metering pumps and sends out a stop alarm signal when the difference between the liquid level values further reaches a stop set value.
8. The apparatus for producing chlorine dioxide as claimed in claim 4, wherein the control means is preset with a raw material residual value and issues a supplementary raw material alarm signal when the level value of one or both of the raw materials drops to the raw material residual value; the control device is also provided with a material shortage level value, and when the liquid level meter detects that the level value of one or two raw materials drops to the material shortage level value, the control device stops the work of the two metering pumps and sends a material shortage alarm signal.
9. The apparatus for preparing chlorine dioxide as claimed in claim 1, wherein the control device is provided with a wireless transmitting module and is connected with a remote control center or a control terminal through the wireless transmitting module and a wireless network.
10. The apparatus for preparing chlorine dioxide as claimed in claim 1, wherein the level meter is an ultrasonic level meter or a float level meter, the liquid suction line of the metering pump is inserted into the raw material barrel, the inlet end of the liquid suction line is provided with a one-way valve, and the output line of the metering pump is provided with a back pressure valve.
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| CN202210382118.XA CN114588843B (en) | 2022-04-13 | 2022-04-13 | Chlorine dioxide preparation device for drinking water disinfection |
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