CN117462983A - Rectifying tower cleaning device and method - Google Patents
Rectifying tower cleaning device and method Download PDFInfo
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- CN117462983A CN117462983A CN202311427538.6A CN202311427538A CN117462983A CN 117462983 A CN117462983 A CN 117462983A CN 202311427538 A CN202311427538 A CN 202311427538A CN 117462983 A CN117462983 A CN 117462983A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 314
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 257
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 189
- 239000003513 alkali Substances 0.000 claims abstract description 23
- 238000003860 storage Methods 0.000 claims abstract description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 330
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 110
- 238000007599 discharging Methods 0.000 claims description 108
- 239000002699 waste material Substances 0.000 claims description 91
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 90
- 238000005406 washing Methods 0.000 claims description 76
- 239000012459 cleaning agent Substances 0.000 claims description 63
- 239000002253 acid Substances 0.000 claims description 52
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 45
- 150000007524 organic acids Chemical group 0.000 claims description 34
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 32
- 238000011049 filling Methods 0.000 claims description 32
- 239000008399 tap water Substances 0.000 claims description 26
- 235000020679 tap water Nutrition 0.000 claims description 26
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 19
- 150000003839 salts Chemical class 0.000 claims description 18
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 8
- 229910000619 316 stainless steel Inorganic materials 0.000 claims description 6
- 239000010963 304 stainless steel Substances 0.000 claims description 5
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 5
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 35
- 239000011575 calcium Substances 0.000 description 35
- 229910052791 calcium Inorganic materials 0.000 description 35
- 238000005086 pumping Methods 0.000 description 17
- 239000002351 wastewater Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000000605 extraction Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WFXRJNDIBXZNJK-KVVVOXFISA-N azanium;(z)-octadec-9-enoate Chemical compound N.CCCCCCCC\C=C/CCCCCCCC(O)=O WFXRJNDIBXZNJK-KVVVOXFISA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention relates to the technical field of rectifying tower cleaning, and provides a rectifying tower cleaning device and a rectifying tower cleaning method. The device comprises a cleaning tank, a raw water tank, a water storage tank and a liquid alkali tank; the bottom discharge port of the rectifying tower is communicated with the raw water tank through a discharge pipe, a tower kettle pump is arranged on the discharge pipe, a side wall feed port of the rectifying tower is communicated with one side, close to the raw water tank, of the tower kettle pump on the discharge pipe through a circulating pipe, a discharge port of the cleaning tank is communicated with the circulating pipe through a feed pipe, a cleaning pump is arranged on the feed pipe, one side, far away from the cleaning tank, of the cleaning pump is communicated with the discharge port of the raw water tank through a feed pipe, and a raw water pump is arranged on the feed pipe; the water outlet of the water storage tank is communicated with the upper side of the joint of the circulating pipe and the feeding pipe through a water inlet pipe, and a water inlet pump is arranged on the water inlet pipe; the liquid outlet of the liquid alkali tank is communicated with the feed inlet on the side wall of the rectifying tower through a liquid feeding pipe, and a liquid alkali pump is arranged on the liquid feeding pipe. The invention can realize online circulation cleaning of the rectifying tower, improves the cleaning efficiency, enhances the cleaning effect, and has simple structure and convenient operation.
Description
Technical Field
The invention relates to the technical field of rectifying tower cleaning, in particular to a rectifying tower cleaning device and method.
Background
In the traditional wet smelting process, liquid alkali and sulfuric acid are used in a large amount by the leaching and extraction ring, and the production cost is high. In the prior art, a battery-grade pure ammonia soap nickel extraction production line is built, ammonia water is used for replacing liquid alkali in an extraction link, a combined process of sulfuration precipitation, calcium precipitation and steam stripping is adopted, wherein a large amount of lime milk is added in a front-end production link to generate byproduct gypsum for removing sulfate ions contained in ammonia soap extract, the byproduct gypsum is treated in links such as a surface filter and a sedimentation tank, the calcium content in wastewater is reduced, part of calcium is still introduced into a rear-end steam stripping production link through a steam stripping middle tank, calcium-containing wastewater enters a rectifying tower after heat exchange of a plate heat exchanger, the rectifying tower is internally composed of a plurality of layers of tower plates, a liquid phase is from top to bottom, a gas phase is from bottom to top, the calcium-containing wastewater is gradually enriched in the tower plates through the tower plates, and calcium scale is easily caused to be blocked. At present, the calcium scale in the rectifying tower is cleaned in a disassembling and cleaning mode, and specifically, the rectifying tower is required to be disassembled, then the rectifying tower is manually cleaned, the process is complex, the cleaning efficiency is low, the production of the rectifying tower is also influenced, and the production efficiency of the rectifying tower is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the rectifying tower cleaning device and the rectifying tower cleaning method, which can realize online circulating cleaning of the rectifying tower, improve the cleaning efficiency, enhance the cleaning effect, and have simple structure and convenient operation.
The technical scheme of the invention is as follows:
a rectifying tower cleaning device comprises a cleaning tank 1, a raw water tank 2, a water storage tank and a liquid alkali tank; the discharge port at the bottom of the rectifying tower 9 is communicated with the raw water tank 2 through a discharge pipe 6, a tower kettle pump 7 is arranged on the discharge pipe 6, a feed port at the side wall of the rectifying tower 9 is communicated with one side, close to the raw water tank 2, of the tower kettle pump 7 on the discharge pipe 6 through a circulating pipe 4, a discharge port of the cleaning tank 1 is communicated with the circulating pipe 4 through a feed pipe 3, a cleaning pump 5 is arranged on the feed pipe 3, one side, far away from the cleaning tank 1, of the cleaning pump 5 on the feed pipe 3 is communicated with the discharge port of the raw water tank 2 through a feed pipe 8, and a raw water pump 10 is arranged on the feed pipe 8; the water outlet of the water storage tank is communicated with the upper side of the joint of the circulating pipe 4 and the feeding pipe 3 through a water inlet pipe, and a water inlet pump is arranged on the water inlet pipe; the liquid outlet of the liquid caustic soda tank is communicated with the feed inlet on the side wall of the rectifying tower 9 through a liquid feeding pipe, and a liquid caustic soda pump is arranged on the liquid feeding pipe.
Optionally, a controller is included; the feeding pipe 3, the water inlet pipe, the feed pipe 8, the liquid feeding pipe, the upper side and the lower side of the joint of the circulating pipe 4 and the feeding pipe 3, the side of the tower kettle pump 7 on the discharging pipe 6, which is close to the rectifying tower 9, and the side of the joint of the circulating pipe 4, which is close to the raw water tank 2, are respectively provided with a feeding valve, a water inlet valve, a feeding valve, a liquid feeding valve, a first circulating valve, a second circulating valve, a first discharging valve and a second discharging valve; all pumps and valves are electrically connected with the controller.
A method for cleaning a rectifying tower by using the rectifying tower cleaning device, comprising the following steps:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, after pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, and controlling the sodium carbonate solution to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, and then discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: filling an acid cleaning agent into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, after the acid cleaning agent is pumped into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, and discharging cleaning waste liquid after the acid cleaning agent is controlled to circularly clean in the rectifying tower 9 by using the tower kettle pump 7;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches a preset PH value threshold value, and otherwise repeatedly performing alkali circulation to adjust the PH.
Optionally, before the rectifying tower 9 is stopped and starts to be cleaned, the raw water pump 10 and the feeding valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharging valve, the tower kettle pump 7 and the second circulating valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged.
Optionally, in the step 3, the mass concentration of the sodium carbonate solution is 8-15%, the salt cycle washing time is 6-8h, and the temperature is 60-80 ℃.
Optionally, in the step 5, the acid cleaning agent is an organic acid cleaning agent with a mass concentration of 10-15% or a hydrochloric acid solution with a mass concentration of 3-5%.
Optionally, in the step 5, the time for cyclic washing of the organic acid cleaning agent is 3-8h, the temperature is 25-50 ℃, the time for cyclic washing of the hydrochloric acid solution is 1.5-2.5h, and the temperature is normal temperature.
Optionally, the organic acid in the organic acid cleaning agent is one or more of sulfamic acid, glycolic acid, citric acid and ethylenediamine tetraacetic acid.
Optionally, in the step 5, when the material of the rectifying tower 9 is 304 stainless steel or 316 stainless steel, the acid cleaning agent is an organic acid cleaning agent; when the material of the rectifying tower 9 is 2205 stainless steel, the acid cleaning agent is hydrochloric acid solution or organic acid cleaning agent. Hydrochloric acid has strong reducibility, a large amount of chloride ions with strong activity exist, and can damage a purification film on the surface of stainless steel to cause corrosion of the stainless steel, so that different cleaning agents are required to be selected during acid washing according to different materials of the rectifying tower 9. 304. The rectifying tower 9 made of 316 stainless steel is pickled by an organic acid cleaning agent; the 2205 stainless steel rectifying tower 9 is pickled by hydrochloric acid or organic acid cleaning agent.
Optionally, in the step 7, the preset PH value is 11.5-12.
The beneficial effects of the invention are as follows:
(1) According to the device, the side wall feed inlet and the bottom feed outlet of the rectifying tower are communicated with the circulating pipe through the feed discharge pipe, the cleaning tank is arranged and communicated with the circulating pipe through the feed pipe, the raw water tank is arranged and communicated with the feed pipe through the feed pipe, the water storage tank is arranged and communicated with the circulating pipe through the feed pipe, the liquid alkali tank is arranged and communicated with the feed inlet at the top of the rectifying tower through the liquid feed pipe, and the tower kettle pump, the cleaning pump, the raw water pump, the feed water pump and the liquid alkali pump are respectively arranged on the feed discharge pipe, the feed water pipe and the feed liquid pipe, so that the online circulating cleaning of the rectifying tower can be realized, the cleaning efficiency is improved, the cleaning effect is enhanced, the influence of frequent shutdown and disassembly cleaning of the rectifying tower on the production of the rectifying tower is avoided, the production efficiency of the rectifying tower is improved, the device is simple in structure and convenient to operate, meanwhile, the energy consumption of the rectifying tower is reduced, the equipment investment of a system is saved, and the manufacturing and the running cost is low.
(2) The device provided by the invention can realize automatic cleaning of the rectifying tower by arranging the controller and arranging the control valve on each pipeline to be electrically connected with the controller, so that the cleaning efficiency is further improved.
(3) According to the method, the sodium carbonate solution is sequentially subjected to the circulating washing, the acid circulating washing and the alkali circulating adjustment of the PH of the rectifying tower, and the water circulating washing is performed before the circulating washing of each cleaning agent, so that calcium dirt enriched on tower plates of the rectifying tower can be effectively removed, the cleaning efficiency is improved, the process flow is simple, the cleaning cost is further reduced, and the production efficiency of the rectifying tower is improved.
(4) According to the method, different acid cleaning agents are arranged for different materials of the rectifying tower, the mass concentration of the sodium carbonate solution is 8-15%, the salt circulation washing time is 6-8h, the temperature is 60-80 ℃, the mass concentration of the organic acid cleaning agent is 10-15%/the mass concentration of the hydrochloric acid solution is 3-5%, the organic acid cleaning agent circulation washing time is 3-8h, the temperature is 25-50 ℃, the hydrochloric acid solution circulation washing time is 1.5-2.5h, and the temperature is normal temperature, so that the rectifying tower can be subjected to targeted washing, the washing efficiency is greatly improved, the washing effect is enhanced, and the washing cost is reduced.
Drawings
Fig. 1 is a schematic structural view of a rectifying column cleaning device of the present invention in example 1.
In the figure, 1-cleaning tank, 2-raw water tank, 3-feeding pipe, 4-circulating pipe, 5-cleaning pump, 6-discharging pipe, 7-tower kettle pump, 8-feeding pipe, 9-rectifying tower and 10-raw water pump.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
Example 1
As shown in fig. 1, in this embodiment 1, the rectifying column washing apparatus of the present invention comprises a washing tank 1, a raw water tank 2, a water storage tank (not shown in the figure), and a liquid caustic tank (not shown in the figure); the discharge port at the bottom of the rectifying tower 9 is communicated with the raw water tank 2 through a discharge pipe 6, a tower kettle pump 7 is arranged on the discharge pipe 6, a feed port at the side wall of the rectifying tower 9 is communicated with one side, close to the raw water tank 2, of the tower kettle pump 7 on the discharge pipe 6 through a circulating pipe 4, a discharge port of the cleaning tank 1 is communicated with the circulating pipe 4 through a feed pipe 3, a cleaning pump 5 is arranged on the feed pipe 3, one side, far away from the cleaning tank 1, of the cleaning pump 5 on the feed pipe 3 is communicated with the discharge port of the raw water tank 2 through a feed pipe 8, and a raw water pump 10 is arranged on the feed pipe 8; the water outlet of the water storage tank is communicated with the upper side of the joint of the circulating pipe 4 and the feeding pipe 3 through a water inlet pipe (not shown in the figure), and a water inlet pump (not shown in the figure) is arranged on the water inlet pipe; the liquid outlet of the liquid caustic soda tank is communicated with the feed inlet on the side wall of the rectifying tower 9 through a liquid feeding pipe (not shown in the figure), and a liquid caustic soda pump (not shown in the figure) is arranged on the liquid feeding pipe.
In this embodiment 1, the rectifying column cleaning apparatus of the present invention further comprises a controller (not shown in the figure); the feeding pipe 3, the water inlet pipe, the feed pipe 8, the liquid feeding pipe, the upper side and the lower side of the joint of the circulating pipe 4 and the feeding pipe 3, the side of the tower kettle pump 7 on the discharging pipe 6, which is close to the rectifying tower 9, and the side of the joint of the circulating pipe 4, which is close to the raw water tank 2, are respectively provided with a feeding valve, a water inlet valve, a feeding valve, a liquid feeding valve, a first circulating valve, a second circulating valve, a first discharging valve and a second discharging valve; all pumps, valves are electrically connected to the controller (not all valves are shown).
In this embodiment 1, the material of the rectifying tower 9 is 304 stainless steel, and the cleaning method of the rectifying tower of the present invention comprises the following steps:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 15% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 8 hours at 80 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: the cleaning tank 1 is filled with an organic acid cleaning agent with the mass concentration of 15%, a cleaning pump 5 and a feeding valve are controlled to be opened, the acid cleaning agent is pumped into a rectifying tower 9 from the cleaning tank 1 by the cleaning pump 5, the cleaning pump 5 and the feeding valve are closed, a first discharging valve, a tower kettle pump 7 and a second circulating valve are simultaneously controlled to be opened, the acid cleaning agent is controlled to be circularly cleaned for 8 hours at 50 ℃ in the rectifying tower 9 by the tower kettle pump 7, and then cleaning waste liquid is discharged; the organic acid in the organic acid cleaning agent comprises sulfamic acid and citric acid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 12, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 1, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 1, the removal rate of calcium scale in the rectifying column 9 after the completion of the washing was 90.5%.
Example 2
In this example 2, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 304 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 15% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 8 hours at 80 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: the cleaning tank 1 is filled with an organic acid cleaning agent with the mass concentration of 15%, a cleaning pump 5 and a feeding valve are controlled to be opened, after the acid cleaning agent is pumped into a rectifying tower 9 from the cleaning tank 1 by the cleaning pump 5, the cleaning pump 5 and the feeding valve are closed, a first discharging valve, a tower kettle pump 7 and a second circulating valve are simultaneously controlled to be opened, and after the acid cleaning agent is controlled to be circularly cleaned for 6 hours at normal temperature in the rectifying tower 9 by the tower kettle pump 7, cleaning waste liquid is discharged; the organic acid in the organic acid cleaning agent comprises sulfamic acid and citric acid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.8, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 2, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 2, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 85.4%.
Example 3
In this example 3, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 304 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 15% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 8 hours at 80 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: the cleaning tank 1 is filled with an organic acid cleaning agent with the mass concentration of 15%, a cleaning pump 5 and a feeding valve are controlled to be opened, after the acid cleaning agent is pumped into a rectifying tower 9 from the cleaning tank 1 by the cleaning pump 5, the cleaning pump 5 and the feeding valve are closed, a first discharging valve, a tower kettle pump 7 and a second circulating valve are simultaneously controlled to be opened, and after the acid cleaning agent is controlled to be circularly cleaned for 3 hours at normal temperature in the rectifying tower 9 by the tower kettle pump 7, cleaning waste liquid is discharged; the organic acid in the organic acid cleaning agent comprises sulfamic acid and citric acid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.5, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 3, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 3, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 74.9%.
Example 4
In this example 4, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 316 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 10% into a cleaning tank 1, controlling a cleaning pump 5 and a feeding valve to be opened, pumping the sodium carbonate solution into a rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 7 hours at 70 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: the cleaning tank 1 is filled with an organic acid cleaning agent with the mass concentration of 12%, a cleaning pump 5 and a feeding valve are controlled to be opened, after the acid cleaning agent is pumped into a rectifying tower 9 from the cleaning tank 1 by the cleaning pump 5, the cleaning pump 5 and the feeding valve are closed, a first discharging valve, a tower kettle pump 7 and a second circulating valve are simultaneously controlled to be opened, and after the acid cleaning agent is controlled to be circularly cleaned for 6 hours at 35 ℃ in the rectifying tower 9 by the tower kettle pump 7, cleaning waste liquid is discharged; the organic acid in the organic acid cleaning agent comprises sulfamic acid and citric acid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 12, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 4, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 4, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 84.7%.
Example 5
In this example 5, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 316 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 15% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 6 hours at 80 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: the cleaning tank 1 is filled with an organic acid cleaning agent with the mass concentration of 15%, a cleaning pump 5 and a feeding valve are controlled to be opened, after the acid cleaning agent is pumped into a rectifying tower 9 from the cleaning tank 1 by the cleaning pump 5, the cleaning pump 5 and the feeding valve are closed, a first discharging valve, a tower kettle pump 7 and a second circulating valve are simultaneously controlled to be opened, and after the acid cleaning agent is controlled to be circularly cleaned for 3 hours at normal temperature in the rectifying tower 9 by the tower kettle pump 7, cleaning waste liquid is discharged; the organic acid in the organic acid cleaning agent comprises sulfamic acid and citric acid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.7, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 5, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 5, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 71.7%.
Example 6
In example 6, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 316 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 8% into a cleaning tank 1, controlling a cleaning pump 5 and a feeding valve to be opened, pumping the sodium carbonate solution into a rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 6 hours at 60 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: the cleaning tank 1 is filled with an organic acid cleaning agent with the mass concentration of 10%, a cleaning pump 5 and a feeding valve are controlled to be opened, after the acid cleaning agent is pumped into a rectifying tower 9 from the cleaning tank 1 by the cleaning pump 5, the cleaning pump 5 and the feeding valve are closed, a first discharging valve, a tower kettle pump 7 and a second circulating valve are simultaneously controlled to be opened, and after the acid cleaning agent is controlled to be circularly cleaned for 3 hours at normal temperature in the rectifying tower 9 by the tower kettle pump 7, cleaning waste liquid is discharged; the organic acid in the organic acid cleaning agent comprises sulfamic acid and citric acid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.5, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 6, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 6, the removal rate of calcium scale in the rectifying column 9 after the completion of the washing was 70.1%.
Example 7
In this example 7, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 2205 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 15% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 8 hours at 80 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: filling hydrochloric acid solution with the mass concentration of 5% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the acid cleaning agent into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the acid cleaning agent to circularly clean for 2.5 hours at normal temperature in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 12, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 7, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 7, the removal rate of calcium scale in the rectifying column 9 after the completion of the washing was 90.3%.
Example 8
In this example 8, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 2205 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 15% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 8 hours at 60 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: filling hydrochloric acid solution with the mass concentration of 5% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the acid cleaning agent into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the acid cleaning agent to circularly clean for 2 hours at normal temperature in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.9, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 8, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the raw water is controlled to circulate in the rectifying tower 9 by utilizing the tower kettle pump 7, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 8, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 73.4%.
Example 9
In this example 9, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 2205 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 15% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the sodium carbonate solution into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 8 hours at 60 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: filling hydrochloric acid solution with the mass concentration of 5% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the acid cleaning agent into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the acid cleaning agent to circularly clean for 1.5 hours at normal temperature in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.5, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 9, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In example 9, the removal rate of calcium scale in the rectifying column 9 after the completion of the washing was 70.8%.
Example 10
In this example 10, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 2205 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling a sodium carbonate solution with the mass concentration of 12% into a cleaning tank 1, controlling a cleaning pump 5 and a feeding valve to be opened, pumping the sodium carbonate solution into a rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 7 hours at 65 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: filling hydrochloric acid solution with the mass concentration of 4% into the cleaning tank 1, controlling the cleaning pump 5 and the feeding valve to be opened, pumping the acid cleaning agent into the rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling the first discharging valve, the tower kettle pump 7 and the second circulating valve to be opened, controlling the acid cleaning agent to circularly clean for 2 hours at normal temperature in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.6, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 10, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In this example 10, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 10 was 71.6%.
Example 11
In this example 11, the rectifying column cleaning apparatus of the present invention is the same as that of example 1, and the rectifying column 9 is made of 2205 stainless steel, and the rectifying column cleaning method of the present invention comprises the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower 9 from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump 7 and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump 7 is utilized to control the tap water to circularly clean in the rectifying tower 9, so that cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank 2 through a discharge pipe 6 by using a tower kettle pump 7, and closing the first discharge valve, the tower kettle pump 7 and the second discharge valve;
Step 3: salt circulation washing: filling sodium carbonate solution with the mass concentration of 8% into a cleaning tank 1, controlling a cleaning pump 5 and a feeding valve to be opened, pumping the sodium carbonate solution into a rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the sodium carbonate solution to circularly clean for 6 hours at 60 ℃ in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 4: repeating the step 2;
step 5: acid circulation washing: filling hydrochloric acid solution with the mass concentration of 3% into a cleaning tank 1, controlling a cleaning pump 5 and a feeding valve to be opened, pumping an acid cleaning agent into a rectifying tower 9 from the cleaning tank 1 by using the cleaning pump 5, closing the cleaning pump 5 and the feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the acid cleaning agent to circularly clean for 1.5 hours at normal temperature in the rectifying tower 9 by using the tower kettle pump 7, and discharging cleaning waste liquid;
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower 9 from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump 7 and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower 9 by using the tower kettle pump 7, discharging cleaning waste liquid, measuring the PH value in the rectifying tower 9, ending the cleaning operation when the PH value reaches 11.5, otherwise repeatedly performing alkali circulation to adjust the PH.
In this embodiment 11, before the rectifying tower 9 is stopped and cleaning is started, the raw water pump 10 and the feed valve are closed, the raw water is stopped from being pumped into the rectifying tower 9 from the raw water tank 2, the first discharge valve, the tower kettle pump 7 and the second circulation valve are controlled to be opened, the tower kettle pump 7 is used for controlling the raw water to circulate in the rectifying tower 9, and after the ammonia nitrogen evaporates, the waste liquid is discharged. Wherein the raw water is calcium-containing wastewater.
In this example 11, the removal rate of calcium scale in the rectifying column 10 after the completion of the washing was 70.2%.
Comparative example 1
This comparative example 1 is different from example 1 in the following points: in the step 3, the mass concentration of the sodium carbonate solution is 3%. After the washing was completed, the removal rate of calcium scale in the rectifying column 9 was 42.1%.
Comparative example 2
This comparative example 2 is different from example 1 in the following points: in the step 3, the time of salt circulation washing is 3 hours; in the step 5, the acid cycle washing time is 3 hours, and the temperature is normal temperature. In comparative example 2, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 50.7%.
Comparative example 3
This comparative example 3 is different from example 7 in the following manner: in the step 3, the mass concentration of the sodium carbonate solution is 4%. In comparative example 3, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 50.3%.
Comparative example 4
This comparative example 4 is different from example 7 in the following manner: in the step 3, the time of salt circulation washing is 4 hours; in the step 5, the mass concentration of the hydrochloric acid solution is 1%, and the time of acid circulation washing is 0.5h. In comparative example 4, after the completion of the washing, the removal rate of the calcium scale in the rectifying column 9 was 40.3%.
The process parameters and the calcium scale removal rates of the above examples 1 to 11 and comparative examples 1 to 4 are shown in Table 1:
TABLE 1
It should be apparent that the above-described embodiments are merely some, but not all, embodiments of the present invention. The above examples are only for explaining the present invention and do not limit the scope of the present invention. Based on the above embodiments, all other embodiments, i.e. all modifications, equivalents and improvements made within the spirit and principles of the present application, which are obtained by persons skilled in the art without making creative efforts are within the scope of the present invention claimed.
Claims (10)
1. The rectifying tower cleaning device is characterized by comprising a cleaning tank (1), a raw water tank (2), a water storage tank and a liquid alkali tank; the material outlet at the bottom of the rectifying tower (9) is communicated with the raw water tank (2) through a material outlet pipe (6), a tower kettle pump (7) is arranged on the material outlet pipe (6), the material inlet at the side wall of the rectifying tower (9) is communicated with one side, close to the raw water tank (2), of the tower kettle pump (7) on the material outlet pipe (6) through a circulating pipe (4), the material outlet of the cleaning tank (1) is communicated with the circulating pipe (4) through a material conveying pipe (3), a cleaning pump (5) is arranged on the material conveying pipe (3), one side, far away from the cleaning tank (1), of the cleaning pump (5) on the material conveying pipe (3) is communicated with the material outlet of the raw water tank (2) through a material inlet pipe (8), and a raw water pump (10) is arranged on the material inlet pipe (8); the water outlet of the water storage tank is communicated with the upper side of the joint of the circulating pipe (4) and the feeding pipe (3) through a water inlet pipe, and a water inlet pump is arranged on the water inlet pipe; the liquid outlet of the liquid caustic soda tank is communicated with the feed inlet on the side wall of the rectifying tower (9) through a liquid feeding pipe, and a liquid caustic soda pump is arranged on the liquid feeding pipe.
2. The rectifying column cleaning device according to claim 1, characterized by comprising a controller; the feeding pipe (3), the water inlet pipe, the feed pipe (8), the liquid feeding pipe, the upper side and the lower side of the joint of the circulating pipe (4) and the feeding pipe (3), and one side of a tower kettle pump (7) on the discharging pipe (6) close to the rectifying tower (9), and one side of the joint of the circulating pipe (4) close to the raw water tank (2) are respectively provided with a feeding valve, a water inlet valve, a feeding valve, a liquid feeding valve, a first circulating valve, a second circulating valve, a first discharging valve and a second discharging valve; all pumps and valves are electrically connected with the controller.
3. A method of rectifying column cleaning using the rectifying column cleaning device of claim 2, characterized by comprising the steps of:
step 1: controlling the first circulation valve to be opened;
step 2: and (3) water circulation washing: after a certain amount of tap water is pumped into the rectifying tower (9) from the water storage tank, the water inlet pump and the water inlet valve are controlled to be opened, the first discharge valve, the tower kettle pump (7) and the second circulation valve are simultaneously controlled to be opened, and the tower kettle pump (7) is utilized to control the tap water to circularly clean in the rectifying tower (9) and then the cleaning waste liquid is discharged; the step of discharging the cleaning waste liquid comprises the steps of closing a second circulation valve, opening a second discharge valve, discharging the cleaning waste liquid into the raw water tank (2) through a discharge pipe (6) by using a tower kettle pump (7), and closing the first discharge valve, the tower kettle pump (7) and the second discharge valve;
Step 3: salt circulation washing: sodium carbonate solution is filled into the cleaning tank (1), the cleaning pump (5) and the feeding valve are controlled to be opened, after the sodium carbonate solution is pumped into the rectifying tower (9) from the cleaning tank (1) by the cleaning pump (5), the cleaning pump (5) and the feeding valve are closed, the first discharging valve, the tower kettle pump (7) and the second circulating valve are simultaneously controlled to be opened, and after the sodium carbonate solution is controlled to be circularly cleaned in the rectifying tower (9) by the tower kettle pump (7), cleaning waste liquid is discharged;
step 4: repeating the step 2;
step 5: acid circulation washing: filling an acid cleaning agent into a cleaning tank (1), controlling a cleaning pump (5) and a feeding valve to be opened, after the acid cleaning agent is pumped into a rectifying tower (9) from the cleaning tank (1) by using the cleaning pump (5), closing the cleaning pump (5) and the feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump (7) and a second circulating valve to be opened, and discharging cleaning waste liquid after the acid cleaning agent is controlled to circularly clean in the rectifying tower (9) by using the tower kettle pump (7);
step 6: repeating the step 2;
step 7: alkaline circulation adjusts pH: filling liquid caustic soda into a liquid caustic soda tank, controlling a liquid caustic soda pump and a liquid feeding valve to be opened, after the liquid caustic soda is pumped into a rectifying tower (9) from the liquid caustic soda tank by using the liquid caustic soda pump, closing the liquid caustic soda pump and the liquid feeding valve, simultaneously controlling a first discharging valve, a tower kettle pump (7) and a second circulating valve to be opened, controlling the liquid caustic soda to circularly clean in the rectifying tower (9) by using the tower kettle pump (7), discharging cleaning waste liquid, measuring the PH value in the rectifying tower (9), ending the cleaning operation when the PH value reaches a preset PH value threshold value, otherwise repeatedly performing alkali circulation to adjust the PH.
4. A rectifying tower cleaning method according to claim 3, characterized in that before the rectifying tower (9) is stopped and begins to be cleaned, a raw water pump (10) and a feed valve are closed, raw water is stopped from being pumped into the rectifying tower (9) from the raw water tank (2), a first discharge valve, a tower kettle pump (7) and a second circulation valve are controlled to be opened, raw water is controlled to circulate in the rectifying tower (9) by utilizing the tower kettle pump (7), and after ammonia nitrogen evaporates, waste liquid is discharged.
5. The method according to claim 3, wherein in the step 3, the mass concentration of the sodium carbonate solution is 8-15%, the salt cycle washing time is 6-8h, and the temperature is 60-80 ℃.
6. The method according to claim 3, wherein in the step 5, the acid cleaning agent is an organic acid cleaning agent having a mass concentration of 10 to 15% or a hydrochloric acid solution having a mass concentration of 3 to 5%.
7. The method for cleaning a rectifying column according to claim 6, wherein in the step 5, the time for circulating the organic acid cleaning agent is 3-8 hours, the temperature is 25-50 ℃, the time for circulating the hydrochloric acid solution is 1.5-2.5 hours, and the temperature is normal temperature.
8. The method for cleaning a rectifying column according to claim 6, wherein the organic acid in the organic acid cleaning agent is one or more of sulfamic acid, glycolic acid, citric acid and ethylenediamine tetraacetic acid.
9. The method according to claim 6, wherein in the step 5, when the material of the rectifying column (9) is 304 stainless steel or 316 stainless steel, the acid cleaning agent is an organic acid cleaning agent; when the material of the rectifying tower (9) is 2205 stainless steel, the acid cleaning agent is hydrochloric acid solution or organic acid cleaning agent.
10. A method of cleaning a rectifying column according to claim 3, characterized in that in said step 7, said preset PH value is 11.5-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311427538.6A CN117462983A (en) | 2023-10-31 | 2023-10-31 | Rectifying tower cleaning device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311427538.6A CN117462983A (en) | 2023-10-31 | 2023-10-31 | Rectifying tower cleaning device and method |
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| CN117462983A true CN117462983A (en) | 2024-01-30 |
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| CN202311427538.6A Pending CN117462983A (en) | 2023-10-31 | 2023-10-31 | Rectifying tower cleaning device and method |
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| Country | Link |
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| CN (1) | CN117462983A (en) |
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2023
- 2023-10-31 CN CN202311427538.6A patent/CN117462983A/en active Pending
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