CN114588843B - Chlorine dioxide preparation device for drinking water disinfection - Google Patents
Chlorine dioxide preparation device for drinking water disinfection Download PDFInfo
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- CN114588843B CN114588843B CN202210382118.XA CN202210382118A CN114588843B CN 114588843 B CN114588843 B CN 114588843B CN 202210382118 A CN202210382118 A CN 202210382118A CN 114588843 B CN114588843 B CN 114588843B
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- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000004155 Chlorine dioxide Substances 0.000 title claims abstract description 43
- 235000019398 chlorine dioxide Nutrition 0.000 title claims abstract description 43
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 27
- 239000003651 drinking water Substances 0.000 title claims abstract description 26
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 199
- 239000007788 liquid Substances 0.000 claims abstract description 95
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
- 239000000645 desinfectant Substances 0.000 claims abstract description 9
- 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 22
- 229960002218 sodium chlorite Drugs 0.000 claims description 22
- 239000007864 aqueous solution Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000005856 abnormality Effects 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000243 solution Substances 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
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000249 desinfective effect Effects 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
- 230000001954 sterilising effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 102000005393 Sodium-Potassium-Exchanging ATPase Human genes 0.000 description 1
- 108010006431 Sodium-Potassium-Exchanging ATPase Proteins 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 239000002253 acid Substances 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
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 231100000219 mutagenic Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000378 teratogenic Toxicity 0.000 description 1
- 230000003390 teratogenic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
Landscapes
- 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 feeding unit, a raw material B feeding unit, a reaction kettle and a control device, wherein the raw material A feeding unit and the raw material B feeding unit both comprise a raw material barrel, a connecting pipeline and a metering pump; the raw material barrel is of a closed structure, and is provided with a liquid level meter and a one-way air inlet valve; the control device controls the work of the metering pump, and adjusts the flow of the corresponding metering pump in real time according to the liquid level value detected by the liquid level meter 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 the reaction in the reaction kettle and the 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 the application of chlorine dioxide to the disinfection of drinking water in village or community and other small water use occasions.
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, ensure the safety of water supply and make disinfection an important link in the water supply treatment process.
Chlorine disinfection has been widely used in water treatment processes in the past, but because of the "tri-induced" substances (carcinomatous, teratogenic and mutagenic) that are by-products of chlorine disinfection (THMs), haloacetic acid (HAAS) and the like, people have begun to limit the content of disinfection by-products (DBPs) and even prohibit the use of liquid chlorine disinfection. As an excellent disinfectant, chlorine dioxide has broad-spectrum sterilization capability, has better disinfection effect on drinking water than liquid chlorine, and does not generate harmful halogenated organic matters in the process of purifying water, thus being considered as an ideal disinfectant capable of replacing liquid chlorine. However, because chlorine dioxide is unstable and highly corrosive, is not easy to store and transport, and needs to be prepared on site for use, development of a chlorine dioxide preparation device capable of automatically and stably operating for a long time, especially an unattended chlorine dioxide preparation device suitable for small water supply occasions such as villages and communities, becomes a precondition for applying chlorine dioxide to drinking water disinfection.
Disclosure of Invention
Aiming at the demands of the prior art, the invention aims to provide a chlorine dioxide preparation device for disinfection of drinking water, which is suitable for small-sized water supply occasions.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
The chlorine dioxide preparation device for drinking water disinfection comprises a raw material A feeding unit, a raw material B feeding unit, a reaction kettle and a control device, wherein the raw material A feeding unit and the raw material B feeding unit both 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 material barrel is of a closed structure, a liquid level meter and a one-way air inlet valve are arranged on the material barrel, the liquid level meter is used for detecting the liquid level of the raw material in the 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 material barrel; the control device controls the operation of the metering pumps, compares the feeding 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 of at least one metering pump in real time so that the raw materials A and B are fed into the reaction kettle according to a set proportion; the raw material A is sodium chlorate aqueous solution or sodium chlorite aqueous solution, and the raw material B is hydrochloric acid; chlorine dioxide generated by the reaction in the reaction kettle and the 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 of the metering pump by adjusting the working frequency of the metering pump, so that the raw materials A and B are added according to a set proportion.
Further, the control device adjusts the flow of the metering pump by improving the working frequency of the metering pump corresponding to the raw material with 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 of the metering pump is regulated by reducing the working frequency of the metering pump corresponding to the raw material with 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 regulated by reducing the working frequency of the metering pump corresponding to the raw material with low liquid level value and simultaneously increasing the working frequency of the metering pump corresponding to the raw material with high liquid level value, so that the raw material A and the raw material B are added according to the set proportion.
Further, 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; the control device compares the liquid level values of the two raw materials in real time, and adjusts the working frequency of the metering pump corresponding to the raw materials with high liquid level values in real time, so that the raw materials A and B are added according to a set proportion.
Further, the raw material A is 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 an aqueous solution of sodium chlorite with the concentration of 8 percent, and the concentration of the hydrochloric acid is 9 percent.
Further, the control device sends out an alarm signal of abnormal raw material feeding when the liquid level values of the raw materials A and B are different and the difference reaches an abnormal set value, and stops the two metering pumps when the liquid level difference further reaches a stop set value and sends out a stop alarm signal.
Further, the control device is preset with a raw material residual value, and sends out a supplementary raw material alarm signal when the liquid level value of one or two raw materials falls to the raw material residual value; the control device is also provided with a material shortage liquid level value, and when the liquid level meter detects that the liquid level value of two raw materials or one of the two raw materials is reduced to the material shortage liquid level value, the control device stops the work of the two metering pumps and sends out a material shortage alarm signal.
Further, the control device is provided with a wireless transmitting module and is connected with a remote control center through the wireless transmitting module and a wireless network.
Further, the liquid level gauge is an ultrasonic liquid level gauge or a floating ball type liquid level gauge, a liquid suction pipeline of the metering pump is inserted into 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.
Chlorine dioxide generated by the reaction is put into a water body to be treated together with reaction residual liquid in real time in the form of 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 water safety, and if the adding amount of sodium chlorate or sodium chlorite is lower than the set proportion, the adding amount of the chlorine dioxide into the water body is insufficient, and too much hydrochloric acid enters the water body, so that the two raw materials are ensured to be added into the primary control index of the chlorine dioxide preparation device according to the set proportion. According to the invention, the addition amounts of the two raw materials are regulated in real time by comparing in real time, so that the addition of the two raw materials according to the set proportion is ensured, and the technical guarantee is provided for the safe use of the chlorine dioxide preparation device in the disinfection treatment of drinking water.
For small-sized water use occasions such as villages and 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 connecting pipeline used is small, and is usually only 3-6mm, but pure liquid which is not always ideal is arranged in a raw material barrel, wherein small amounts of solid impurities exist on the inner wall of a sodium chlorate and sodium chlorite feeding pipeline and on the membrane of a metering pump and on the inner wall of an inlet and outlet of the metering pump, sodium chlorate and sodium chlorite crystallization can occur slowly along with the work, and bubbles can also appear in the pipeline of a hydrochloric acid feeding unit along with the seasonal change, and the resistance of the flow channel, even the flow channel blockage, the normal feeding of raw materials can be increased no matter whether the solid impurities are sucked into the flow channel or the crystallization 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 several times of the common metering pumps, and have harsh use conditions, and an auxiliary device is required to be arranged, so that the cost of the whole machine is greatly increased. The invention adopts a mode of directly detecting the liquid level value of the raw materials to control the feeding of the raw materials, thereby ensuring the true and reliable detection data, ensuring the quantitative proportion feeding of the two raw materials, ensuring the simple structure of the preparation device, improving the working reliability of the equipment and reducing the requirement on the working environment condition.
The reaction speed of the two raw materials and the yield of the chlorine dioxide are closely related to the concentration and the adding proportion of the raw material solution, and 7% -8% of sodium chlorite aqueous solution and 8% -9% of hydrochloric acid are taken as raw materials and added according to the volume ratio of 1:1, so that the two raw materials can react rapidly and fully, the yield of more than 95% is obtained, the continuous operation of the chlorine dioxide production is realized, and the continuous disinfection of a flowing water body is realized. On this basis, utilize the raw materials bucket splendid attire raw materials of same specification, not only be convenient for the follow-up of two kinds of raw materials, the inspector of being convenient for is to the direct view of raw materials throwing the situation, also makes controlling means can directly acquire the throwing volume of raw materials from the raw materials liquid level value, has simplified controlling means's working procedure for equipment operation is more reliable and stable.
The back pressure valve is arranged on the output pipeline of the metering pump, so that the influence of downstream pressure fluctuation on stable operation of the metering pump can be eliminated, and the phenomenon that raw materials in the raw material barrel are sucked into water body to siphon under the condition that the metering pump stops operating can be prevented. The one-way valve is arranged at the inlet of the liquid suction pipeline of the metering pump, so that the metering pump and the raw material backflow barrel in the pipeline can be prevented, and under the condition that the metering pump stops working together with the back pressure valve, the metering pump and the upstream and downstream pipelines are always filled with raw material solution, and the precipitation of sodium chlorate or sodium chlorite is delayed.
The chlorine dioxide preparation device for disinfecting village or community drinking water is usually installed in an unattended environment, is connected with a remote control center by utilizing a wireless transmitting module, can greatly facilitate a worker to monitor a plurality of chlorine dioxide preparation devices distributed at multiple points, knows the working state of the device in real time, adjusts the working parameters of the device according to the change of water supply conditions in time, and discharges faults and supplements raw materials in time.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
In the figure: 1a raw material barrel, 2 a raw material barrel, 3 a reaction kettle, 4a metering pump, 5 a metering pump, 6 a floating ball type liquid level meter, 6.1 a liquid level meter rod body, 6.2 a liquid level meter floating ball, 7a one-way air inlet valve, 8 a one-way valve, 9 a back pressure valve and 10 a raw material barrel cover.
Detailed Description
The present invention will be described with reference to examples.
Fig. 1 shows an example of a chlorine dioxide production apparatus for sterilizing drinking water according to the present invention.
As shown in the figure, the chlorine dioxide preparation device for disinfection of drinking water in this example comprises a reaction kettle 3, a raw material a feeding unit positioned at the left side of the reaction kettle 3, a raw material B feeding unit positioned at the right side of the reaction kettle 3, and a control device (not shown in the figure); the raw material A feeding unit comprises a raw material barrel I1, a metering pump I4 and connecting pipelines at the upper and lower sides of the metering pump I, a liquid suction pipeline at the inlet side of the metering pump I4 is inserted in the raw material barrel I1, a one-way valve 8 is arranged at the inlet of the liquid suction pipeline, a back pressure valve 9 is arranged on the connecting pipeline at the outlet side of the metering pump I4, raw material A is contained in the raw material barrel I1, the metering pump I4 sucks the raw material A in the raw material barrel I and conveys the raw material A to a reaction kettle 3 along the direction indicated by an arrow at the upper left side in the figure, the raw material barrel I1 is of a closed structure, a floating ball type liquid level meter 6 is inserted on the top wall of the raw material barrel I, a floating ball type 6.2 floats on the liquid level of the raw material A and moves along a liquid level meter rod body 6.1 along with the lifting of the liquid level meter, 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 I1, the liquid level meter 6 is used for detecting the liquid level of the raw material A in real time and conveying detection signals to a control device, and when the liquid level of the raw material A descends, and external air enters the raw material barrel I1 through the one-way air valve 7 to keep the pressure inside and outside the raw material barrel I1 balanced; the raw material B feeding unit and the raw material A feeding unit have the same structure, the shape and 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 the arrow on 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 in a tubular shape with end walls at two ends, the upper end wall of the reaction kettle is provided with a raw material input port, the lower end wall of the reaction kettle is provided with a disinfectant output port, a feeding pipeline of raw materials A and B is connected with an input pipeline of the reaction kettle 3 above the reaction kettle 3 through a tee joint, and the 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).
The raw materials A and B are intersected above the reaction kettle 3 through a tee joint and then are input into the reaction kettle 3, so that the two raw materials can be reacted along with downward flowing by adopting a vertically arranged reaction kettle with a simple tubular structure, and a required disinfectant is formed 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 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 disinfection device works, firstly, sodium chlorite aqueous solution and hydrochloric acid with the same volume are respectively added into two raw material barrels, then, the input dosage of chlorine dioxide is determined according to the condition of drinking water, the input dosage of sodium chlorite and hydrochloric acid is calculated according to the dosage of chlorine dioxide, the working frequencies of a first metering pump 4 and a second metering pump 5 are set according to the input dosage through a control device, 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, chlorine dioxide is generated in the reaction kettle 3, the chlorine dioxide is dissolved in reaction residual liquid to form disinfection liquid, the disinfection liquid is input into a drinking water body through a pipeline from a lower end outlet (see arrow below the reaction kettle 3 in the figure) of the reaction kettle 3, and the disinfection liquid is continuously output along with the continuous input 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 first raw material barrel 1 and the hydrochloric acid in the second raw material barrel 2 are continuously consumed, and when the liquid level meter 6 detects that the liquid level value of two raw materials or one of the two raw materials is reduced to the set raw material residual value, the control device sends a raw material supplementing alarm signal to inform a manager of timely supplementing the raw materials so as not to influence the normal disinfection of the drinking water body. When the manager fails to supplement the raw materials in time, when the liquid level value of the two raw materials or one of the two raw materials falls to the material shortage liquid level value, the raw materials are 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 liquid level values of two raw materials in real time and transmit detection results to the control device, the control device compares the liquid level values of the two raw materials in real time, when a difference value occurs between the two liquid level values, the addition amount of one raw material is lower than the amount required by the set proportion, and the control device can improve the addition amount of the corresponding raw materials by improving the working frequency of the metering pump of the addition unit with less addition amount, so that the addition of the two raw materials according to the set proportion is ensured.
In practice, when the liquid level values of the two raw materials are different, the feeding amount of one raw material is usually reduced, so that the working frequency of the metering pump with small feeding amount is only required to be increased, and the working frequency of the other metering pump is kept unchanged. In addition, the operation frequency of the metering pump with a large amount of addition can be reduced to maintain the set proportion of the addition of the two raw materials, and the operation frequency of the two metering pumps can be adjusted simultaneously to restore the addition of the two raw materials to the set proportion. Of course, the dosage of the raw materials is kept within a range capable of effectively disinfecting the water body no matter the working frequency of the metering pump is increased or the working frequency of the metering pump is reduced.
Under the condition that the flow channel resistance of a certain raw material adding unit is overlarge or blocked (the flow channel of a sodium chlorite adding unit is usually blocked) or a metering pump cannot work normally, even if a control device adjusts the adding amount of raw materials, the difference value of the liquid level values of two raw materials can still be continuously expanded, when the difference value of the liquid level values of the two raw materials reaches an abnormal set value, the control device sends out an alarm signal for adding the raw materials in abnormal mode, when the difference value of the liquid level values of the two raw materials further reaches a stopping set value, the raw materials with high liquid level values are indicated to be not added normally, the control device stops the two metering pumps to prevent single raw materials from being added into drinking water, and then sends out a fault stopping alarm signal to inform management personnel to remove faults in time.
Although the raw material barrels with the same shape and specification are used for containing two raw materials, and the liquid level values of the two raw materials are the same, the control device can directly compare the two liquid level values, but the actual comparison is the addition amount of the raw materials, so that different raw material barrels can also be used for containing the two raw materials.
The concentration of the sodium chlorite aqueous solution is selected within the range of 7-8% and the concentration of the hydrochloric acid is selected within the range of 8-9% when the sodium chlorite aqueous solution and the hydrochloric acid are added in a volume ratio of 1:1 in actual use, so that rapid and full reaction of the sodium chlorite aqueous solution and the hydrochloric acid can be ensured, and the chlorine dioxide conversion rate of more than 95% is obtained.
The drinking water disinfection equipment for small-sized water use occasions has the characteristics of numerous and scattered positions, equipment providers cannot equip special maintenance personnel for each equipment, special management personnel are required to be equipped for equipment users, the running cost and personnel waste can be increased, therefore, a wireless transmitting module can be arranged for the chlorine dioxide preparation device, the wireless transmitting module and a public wireless network are used for connecting the chlorine dioxide preparation device with a remote control center, a centralized management internet of things system is constructed, a small number of management personnel can be arranged for managing and controlling the equipment in one area, raw materials are timely supplemented for the equipment, faults are timely found out and removed, the equipment working parameters are timely adjusted according to seasonal changes, and related personnel can timely know the running state of the equipment through wireless devices such as mobile phones and the like by using hierarchical management.
In the above examples, the floating ball type liquid level meter is adopted, the diaphragm type metering pump is adopted as the metering pump, and besides, various applicable liquid level meters such as ultrasonic liquid level meters and various known applicable metering pumps can be adopted.
Finally, it should be pointed out that the technical solution protected by the present invention can have numerous other specific embodiments which can be made by a person skilled in the art, besides the examples described above, which are given by way of illustration only and do not limit the scope of protection of the present invention.
Claims (9)
1. The chlorine dioxide preparation device for drinking water disinfection is characterized by comprising a raw material A feeding unit, a raw material B feeding unit, a reaction kettle and a control device, wherein the raw material A feeding unit and the raw material B feeding unit 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 material barrel is of a closed structure, a liquid level meter and a one-way air inlet valve are arranged on the material barrel, the liquid level meter is used for detecting the liquid level of the raw material in the 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 material barrel; the control device controls the operation of the metering pumps, compares the feeding 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 of at least one metering pump in real time so that the raw materials A and B are fed into the reaction kettle according to a set proportion; the raw material A is sodium chlorite aqueous solution, and the raw material B is hydrochloric acid; chlorine dioxide generated by the reaction in the reaction kettle and the reaction residual liquid are put into the drinking water body to be disinfected in real time in the form of disinfectant; 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; the control device compares the liquid level values of the two raw materials in real time, and adjusts the working frequency of the metering pump corresponding to the raw materials with high liquid level values in real time, so that the raw materials A and B are added according to a set proportion.
2. The chlorine dioxide production apparatus according to 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 operating frequency of the metering pump, so that the raw material a and the raw material B are added in a set ratio.
3. The chlorine dioxide production apparatus according to claim 2, wherein the control device adjusts the flow rate of the metering pump by increasing the operating 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 of the metering pump is regulated by reducing the working frequency of the metering pump corresponding to the raw material with 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 regulated by reducing the working frequency of the metering pump corresponding to the raw material with low liquid level value and simultaneously increasing the working frequency of the metering pump corresponding to the raw material with high liquid level value, so that the raw material A and the raw material B are added according to the set proportion.
4. The chlorine dioxide production apparatus of claim 2, wherein said raw material 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%.
5. The chlorine dioxide production apparatus of claim 2, 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%.
6. The chlorine dioxide production apparatus according to claim 2, wherein the control means issues an alarm signal of abnormality in the raw material addition when the liquid level values of the raw material a and the raw material B are different and the difference reaches an abnormality set value, and stops the operation of both the metering pumps and issues a stop alarm signal when the liquid level difference further reaches a stop set value.
7. The chlorine dioxide production apparatus according to claim 2, wherein the control means is preset with a raw material residual value, and issues a supplementary raw material alarm signal when the liquid level value of one or both of the raw materials falls to the raw material residual value; the control device is also provided with a material shortage liquid level value, and when the liquid level meter detects that the liquid level value of two raw materials or one of the two raw materials is reduced to the material shortage liquid level value, the control device stops the work of the two metering pumps and sends out a material shortage alarm signal.
8. The chlorine dioxide production apparatus of claim 1, wherein the control device is provided with a wireless transmission module and is connected to a remote control center or a control terminal through the wireless transmission module and a wireless network.
9. The chlorine dioxide preparation device according to claim 1, wherein the liquid level meter is an ultrasonic liquid level meter or a floating ball liquid level meter, a liquid suction pipeline of the metering pump is inserted into the raw material barrel, a one-way valve is arranged at an inlet end of the liquid suction pipeline, and a back pressure valve is arranged on an output pipeline of the metering pump.
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