Online cleanable milk of lime piping system and method of use

Abstract

The present invention relates to the technical field of piping cleaning, and discloses an online cleanable milk of lime piping system, including a first settling tank, a second settling tank, a first milk of lime discharge assembly, and a second milk of lime discharge assembly, and a method for using the same, in which the first settling tank and the second settling tank are connected by a first piping arrangement, the first milk of lime discharge assembly is connected to the first piping by a second piping arrangement, and the second milk of lime discharge assembly is connected to the first piping by a third piping arrangement, and the piping system further includes a chemical injection cleaning box, which is connected to the second piping and the third piping respectively by a first branch piping arrangement, and the chemical injection cleaning box is further connected to the first piping by a second branch piping arrangement, and the present invention has the characteristics of simple maintenance process, short cleaning cycle, short start-up time, and guaranteed water supply.

Description

[Technical field]

[0001] The present invention relates to the technical field of pipe cleaning, and in particular to a milk of lime pipe system that can be cleaned on-line and a method for using same. [Background technology]

[0002] At present, in the advanced water treatment equipment of thermal power plants, the settling tank carries out the settling treatment by means of dosing with lime milk and polyferrous sulfate. The transportation method is as follows: the aqueous solution containing lime milk is transported into the settling tank through a pipeline; however, the main component of the lime milk solution is calcium hydroxide, which has adhesive properties and easily adheres to the inside of the pipe, which will increase the thickness of the lime milk over a long period of time and reduce the diameter of the pipe, leading to clogging of the pipe in the long term, resulting in a decrease in the treatment capacity of the equipment, and in serious cases, failure to operate; in addition, the lime milk solution is alkaline, and the lime milk adheres to the pipe, which affects the stability of the dosing system, which fails to adjust the pH to meet the requirements, and the hardness removal during water treatment is insufficient, affecting the water quality.

[0003] In the prior art, the solution to the blockage of the lime milk pipe is often to cut the pipe, clean and clear the pipe segment by segment, and then weld the pipe. However, because the lime milk pipe is long, the maintenance process is complicated and the cleaning cycle is long, which affects the operation of the equipment and also affects the water supply system. In addition, the lime injection system is generally used for the reclaimed water source, and in addition to the mechanical acceleration stirring settling tank, the lime system has a long restart cycle when maintenance is stopped and after the maintenance is completed, and the water supply volume of the thermal power plant in northern China is large, so it is easy to cause water outages. Summary of the Invention

[0004] In view of this, the present invention provides a milk of lime piping system that can be cleaned online and a method for using the same.

[0005] In order to solve the above technical problems, the present invention uses the following technical solutions: In a first aspect, the present invention provides an online cleanable milk of lime piping system, including a first settling tank, a second settling tank, a first milk of lime discharge assembly, and a second milk of lime discharge assembly, wherein a first communication port of the first settling tank is connected to a first communication port of the second settling tank by a first piping arrangement;

[0006] The discharge end of the first milk of lime discharge assembly is connected to the first pipe by the arrangement of the second pipe, and the second pipe is provided with a first electric control valve, a first ball valve and a first stop valve in this order from the direction away from the first milk of lime discharge assembly;

[0007] The discharge end of the second milk of lime discharge assembly is connected to the first pipe by the arrangement of the third pipe, and the third pipe is provided with a second electric control valve, a second ball valve and a second stop valve in this order from the direction away from the second milk of lime discharge assembly;

[0008] The piping system further includes a chemical injection cleaning box, a first communication port of the chemical injection cleaning box communicates with the second pipe and the third pipe by the arrangement of a first branch pipe, a branch end of the first branch pipe communicates with the second pipe and the third pipe, and a third electric control valve, a chemical injection pump, a third stop valve and a fourth ball valve are provided in this order in the pipeline of the junction end of the first branch pipe from a direction away from the chemical injection cleaning box,

[0009] The second communication port of the chemical injection cleaning box is connected to the first pipe by the arrangement of the second branch pipe, the line at one side of the branch end of the second branch pipe is connected to the line at one side of the first pipe near the first settling tank, and the line at the other side of the branch end of the second branch pipe is connected to the line at one side of the first pipe near the second settling tank, and the two ends of the pipes on both sides of the branch end of the second branch pipe are also provided with fifth ball valves;

[0010] the third communication port of the chemical injection cleaning box communicates with the external collection tank by means of a piping connection, and a sixth ball valve is provided in the pipeline for communicating the third communication port of the chemical injection cleaning box with the external collection tank;

[0011] The first piping is also provided with a fourth stop valve, a fifth stop valve and a seventh ball valve, the fourth stop valve being provided near the first settling tank and the position of the fourth stop valve provided on the first piping being closer to the first settling tank than the connection position between the second branch piping and the one side of the pipe in the first piping that is closer to the first settling tank, the fifth stop valve being provided near the second settling tank and the position of the fifth stop valve provided on the first piping being closer to the second settling tank than the connection position between the second branch piping and the one side of the pipe in the first piping that is closer to the second settling tank, and the seventh ball valve being provided in the pipeline of the first piping between the position of the second piping connected to the first piping and the position of the third piping connected to the first piping.

[0012] Furthermore, the second pipe is connected to the first pipe by the arrangement of a third branch pipe, the merging end of the third branch pipe is connected to the pipe between the first electronically controlled valve and the first ball valve in the second pipe, the branching end of the third branch pipe is connected to the pipe between the fourth stop valve and the seventh ball valve in the first pipe, and the pipes on both sides of the branching end of the third branch pipe are also provided with an eighth ball valve, a first transport pump, a sixth stop valve and a ninth ball valve, arranged in this order from the direction away from the second pipe.

[0013] Furthermore, the third pipe is connected to the first pipe by the arrangement of a fourth branch pipe, the merging end of the fourth branch pipe is connected to the pipe between the second electronically controlled valve and the second ball valve in the third pipe, the branching end of the fourth branch pipe is connected to the pipe between the fifth stop valve and the seventh ball valve in the first pipe, and the pipes on both sides of the branching end of the fourth branch pipe are also provided with a tenth ball valve, a second transport pump, a seventh stop valve and an eleventh ball valve, arranged in this order from the direction away from the third pipe.

[0014] Furthermore, a 12th ball valve is also provided in the first pipe, and the 12th ball valve is provided in a pipeline between a connection point between the second branch pipe and the first pipe and a connection point between the third branch pipe and the first pipe.

[0015] Furthermore, a 13th ball valve is also provided in the first pipe, and the 13th ball valve is provided in a pipeline between a connection point between the second branch pipe and the first pipe and a connection point between the fourth branch pipe and the first pipe.

[0016] Furthermore, the discharge end of the first milk of lime discharge assembly and the third branch pipe are further connected to a parent pipe of an external tap water pump by a piping connection means, and an eighth stop valve is provided in the pipe connecting the discharge end of the first milk of lime discharge assembly and the parent pipe of the external tap water pump, and a first manual butterfly valve and a first electric butterfly valve are provided in this order from the direction closest to the third branch pipe in the pipe connecting the third branch pipe and the parent pipe of the external tap water pump.

[0017] Furthermore, the discharge end of the second milk of lime discharge assembly and the fourth branch pipe are further connected to a parent pipe of an external tap water pump by a piping connection means, and a ninth stop valve is provided in the pipe connecting the discharge end of the second milk of lime discharge assembly and the parent pipe of the external tap water pump, and a second manual butterfly valve and a second electric butterfly valve are provided in this order from the direction closest to the fourth branch pipe in the pipe connecting the fourth branch pipe and the parent pipe of the external tap water pump.

[0018] Further, the second communication port of the first settling tank communicates with an external chemical injection chamber by a piping connection means, the third communication port of the first settling tank communicates with an external drain by a piping connection means, the fourth communication port of the first settling tank communicates with a parent pipe of an external tap water pump and an external sludge pump by piping connection means, and a tenth stop valve is provided in a pipeline for communicating the fourth communication port of the first settling tank with the parent pipe of the external tap water pump. In the pipeline for connecting the fourth communication port of the first settling tank with the external sludge discharge pump, a 14th ball valve and a third electronically controlled valve are provided in that order from the direction away from the first settling tank, and the pipeline for connecting the fourth communication port of the first settling tank with the parent pipe of the external tap water pump and the pipeline for connecting the fourth communication port of the first settling tank with the external sludge discharge pump are connected by the arrangement of a fourth piping, and a third electric butterfly valve and an 11th stop valve are provided in the fourth piping.

[0019] Further, the second communication port of the second settling tank communicates with an external chemical injection chamber by a piping connection means, the third communication port of the second settling tank communicates with an external drain by a piping connection means, the fourth communication port of the second settling tank communicates with a parent pipe of an external tap water pump and an external sludge pump by piping connection means, and a twelfth stop valve is provided in the pipeline for communicating the fourth communication port of the second settling tank with the parent pipe of the external tap water pump, In the pipeline connecting the fourth communication port of the second settling tank and the external sludge discharge pump, a 15th ball valve and a 4th electronically controlled valve are provided in that order from the direction away from the second settling tank, and the pipeline connecting the fourth communication port of the second settling tank and the parent pipe of the external tap water pump and the pipeline connecting the fourth communication port of the second settling tank and the external sludge discharge pump are connected by the arrangement of a 5th piping, and a 4th electric butterfly valve and a 13th stop valve are provided in the 5th piping.

[0020] The present invention provides a method of using an on-line cleanable milk of lime piping system, the method comprising:

[0021] When the milk of lime piping system is in operation, all valves except the first electronic control valve, the second electronic control valve, the first motorized butterfly valve, the second motorized butterfly valve, the third electronic control valve, the third motorized butterfly valve, the fourth electronic control valve, the fourth motorized butterfly valve, the first ball valve, the first stop valve, the second ball valve, the second stop valve, the third ball valve, the third stop valve, the fourth ball valve, the fifth ball valve, the sixth ball valve and the seventh ball valve are in a normally open state, and the opening and closing states of the first electronic control valve, the second electronic control valve, the first motorized butterfly valve, the second motorized butterfly valve, the third electronic control valve, the third motorized butterfly valve, the fourth electronic control valve and the fourth motorized butterfly valve are changed according to actual needs, and the first ball valve, the first stop valve, the second ball valve, the second stop valve, the third ball valve, the third stop valve, the fourth ball valve, the fifth ball valve, the sixth ball valve and the seventh ball valve are in a normally closed state;

[0022] When the milk of lime piping system is clogged, a step of determining a clogging type of the milk of lime piping system based on a phenomenon caused by the clogging,

[0023] If the clogging type is caused by milk of lime in the piping, the first electronic control valve, the second electronic control valve, the fourth stop valve, the fifth stop valve, the first motorized butterfly valve, the second motorized butterfly valve, the ninth ball valve, and the eleventh ball valve are closed, and the first stop valve, the second stop valve, the third ball valve, the third stop valve, the fourth ball valve, and the fifth ball valve are opened. At the same time, the chemical injection pump is controlled to operate. The chemical injection pump injects the chemical solution in the chemical injection cleaning box into the milk of lime piping system and circulates it in the milk of lime piping system. At the same time, the pH value of the chemical solution in the chemical injection cleaning box is measured. When the pH value decreases, the chemical solution is added. When the pH value becomes stable, the circulation of the chemical solution is stopped and the system is immersed. After immersing for a certain period of time, the first motorized butterfly valve, the second motorized butterfly valve, and the sixth ball valve are opened, and the milk of lime piping system is washed with water from the parent pipe of the external tap water pump. The liquid after washing flows into the external collection tank.

[0024] If the type of clogging is at the mouth of the first transport pump and the second transport pump, the first electronic control valve, the second electronic control valve, the fourth stop valve, the fifth stop valve, the first motorized butterfly valve, and the second motorized butterfly valve are closed, and the first ball valve, the second ball valve, the third ball valve, the third stop valve, the fourth ball valve, and the fifth ball valve are opened, and at the same time, the chemical injection pump is controlled to operate, and the chemical injection pump injects the chemical solution in the chemical injection cleaning box into the milk of lime piping system and circulates it in the milk of lime piping system, and at the same time, measures the pH value of the chemical solution in the chemical injection cleaning box, and when the pH value decreases, adds the chemical solution, and when the pH value becomes stable, stops the circulation of the chemical solution and soaks it, and after soaking for a certain period of time, opens the first motorized butterfly valve, the second motorized butterfly valve, and the sixth ball valve, and washes the milk of lime piping system with water from the parent pipe of the external tap water pump, and the liquid after washing flows into the external collection tank.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] 1. In the present invention, by adding the chemical dosing cleaning box and arranging the associated piping and valves, when the lime milk piping is clogged, there is no need to cut the piping to clean it. Instead, the opening and closing of the corresponding valve is controlled, and the chemical liquid in the chemical dosing cleaning box is injected into the lime milk piping by the chemical dosing pump, so that the lime milk piping can be cleaned online. At the same time, the corresponding valve is closed during the cleaning process, so that the first and second settling tanks can be separated from the lime milk piping. Therefore, there is no need to stop the operation of the first and second settling tanks and shorten the start-up time during the cleaning process. Compared with the prior art, this invention has the advantages of simpler maintenance procedures, shorter cleaning cycles, shorter start-up times, and guaranteed water supply.

[0027] 2. In the present invention, by arranging the seventh ball valve, the lime milk pipeline system can be divided into two sets of pipeline systems with the same functions. When one set of pipeline systems fails, the seventh ball valve can be opened to use the other set of pipeline systems to improve the risk resistance of the entire lime milk pipeline system. In the later cleaning process, when the cleaning work of one set of pipeline systems stops, the other set of pipeline systems can be used to ensure the stability of the entire water supply system, and the occurrence of water supply interruption can be avoided as much as possible.

[0028] 3. The present invention provides a method for using a lime milk piping system that can be cleaned online, which can clean the lime milk piping online without affecting the operation of the first and second settling tanks. In addition, the cleaning effect can be ensured by methods such as pH adjustment and chemical immersion, and the amount of lime milk adhesion in the piping can be reduced as much as possible. [Brief description of the drawings]

[0029] In order to more clearly describe the technical solutions of the embodiments of the present invention, the following briefly introduces drawings necessary for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0030] [Figure 1] FIG. 2 is a structural schematic diagram of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and obviously, the described embodiments are only some but not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention. Example 1

[0032] As shown in FIG. 1, this embodiment provides an online cleanable milk of lime piping system, including a first settling tank 1, a second settling tank 2, a first milk of lime discharge assembly 3 and a second milk of lime discharge assembly 4, the first settling tank 1 and the second settling tank 2 are used for removing suspended solids and colloids in the input liquid, the first milk of lime discharge assembly 3 and the second milk of lime discharge assembly 4 are used for preparing milk of lime solution;

[0033] A first communication port of the first settling tank 1 communicates with a first communication port of the second settling tank 2 through the arrangement of a first pipe 5;

[0034] The discharge end of the first milk of lime discharge assembly 3 is connected to the first pipe 5 through the arrangement of the second pipe 6, so that the milk of lime solution prepared by the first milk of lime discharge assembly 3 can enter the first settling tank 1 and the second settling tank 2 through the first pipe 5 and the second pipe 6. The second pipe 6 has a first electric control valve 7, a first ball valve 8 and a first stop valve 9 provided in this order from the direction away from the first milk of lime discharge assembly 3;

[0035] The discharge end of the second milk of lime discharge assembly 4 is connected to the first pipe 5 through the arrangement of the third pipe 10, so that the milk of lime solution prepared by the second milk of lime discharge assembly 4 can enter the first settling tank 1 and the second settling tank 2 through the first pipe 5 and the third pipe 10; the third pipe 10 has a second electric control valve 11, a second ball valve 12 and a second stop valve 13 provided in this order from the direction away from the second milk of lime discharge assembly 4;

[0036] The milk of lime piping system further includes a chemical injection cleaning box 14, in which an acidic chemical solution capable of reacting with milk of lime is added. The first communication port of the chemical injection cleaning box 14 is connected to the second pipe 6 and the third pipe 10 through the first branch pipe 15, and the branch end of the first branch pipe 15 is connected to the second pipe 6 and the third pipe 10, so that the chemical solution in the chemical injection cleaning box 14 flows into the second pipe 6 and the third pipe 10 through the first branch pipe 15 and cleans the pipelines that it passes through. At the same time, the positions where the branch ends of the first branch pipe 15 are connected to the second pipe 6 and the third pipe 10 are respectively called the first branch pipe 15 and the third pipe 10. The first ball valve 8 and the first stop valve 9 are located between the second ball valve 12 and the second stop valve 13, so that the first ball valve 8 and the first stop valve 9 can separate the chemical injection cleaning box 14 from the first pipe 5 and the first lime milk discharge assembly 3, and the second ball valve 12 and the second stop valve 13 can separate the chemical injection cleaning box 14 from the first pipe 5 and the second lime milk discharge assembly 4, making the subsequent cleaning process more convenient. In the pipeline at the junction end of the first branch pipe 15, the third ball valve 16, the chemical injection pump 17, the third stop valve 18 and the fourth ball valve 19 are provided in this order from the direction away from the chemical injection cleaning box 14.

[0037] The second communication port of the chemical injection cleaning box 14 communicates with the first pipe 5 through the arrangement of the second branch pipe 20, so that the chemical injection cleaning box 14 communicates with the first pipe 5 through the second branch pipe 20, and the subsequent cleaning process is more convenient. The line at one side of the branch end of the second branch pipe 20 is connected to the line at one side of the first pipe 5 that is closer to the first settling tank 1, and the line at the other side of the branch end of the second branch pipe 20 is connected to the line at one side of the first pipe 5 that is closer to the second settling tank 2. Therefore, in the subsequent pipe cleaning process, all the pipes can be cleaned as much as possible. The fifth ball valves 21 are also provided at the two ends of the pipes on both sides of the branch end of the second branch pipe 20. The arrangement of the fifth ball valves 21 allows the chemical injection cleaning box 14 and the first pipe 5 to be separated, and the lines on both sides of the branch end of the second branch pipe 20 to be separated, so that the subsequent cleaning process is more convenient.

[0038] The third communication port of the chemical injection cleaning box 14 communicates with the external collection tank 22 by means of a piping connection, which facilitates the subsequent collection of waste liquid. A sixth ball valve 23 is provided in the piping for communication between the third communication port of the chemical injection cleaning box 14 and the external collection tank 22.

[0039] The first piping 5 is also provided with a fourth stop valve 24, a fifth stop valve 25 and a seventh ball valve 26. The fourth stop valve 24 is provided near the first settling tank 1. The position of the fourth stop valve 24 provided on the first piping 5 is closer to the first settling tank 1 than the connection position between the second branch piping 20 and one side of the pipe in the first piping 5 that is closer to the first settling tank 1. Therefore, when the fourth stop valve 24 is closed, the first communication port of the first settling tank 1 can be separated from the external pipe, making the subsequent cleaning process more convenient. The fifth stop valve 25 is provided near the second settling tank 2. The position of the fifth stop valve 25 provided on the first piping 5 is closer to the first settling tank 1 than the connection position between the second branch piping 20 and one side of the pipe in the first piping 5 that is closer to the second settling tank 2. The seventh ball valve 26 is provided in the pipeline of the first pipe 5 between the position of the second pipe 6 connected to the first pipe 5 and the position of the third pipe 10 connected to the first pipe 5, so as to play a separating role and divide the lime milk pipeline system into two sets of pipeline systems with the same function. When one set of pipeline systems fails, the seventh ball valve 26 can be opened to use the other set of pipeline systems, which not only improves the risk resistance of the entire lime milk pipeline system, but also makes the subsequent cleaning process more convenient.

[0040] In this embodiment, the second pipe 6 is connected to the first pipe 5 by the arrangement of the third branch pipe 27, and the junction end of the third branch pipe 27 is connected to the pipeline between the first electronic control valve 7 and the first ball valve 8 in the second pipe 6, so that the first electronic control valve 7 can separate the first milk of lime discharge assembly 3 from the external pipeline, and the subsequent cleaning process is more convenient; the branch end of the third branch pipe 27 is connected to the pipeline between the fourth stop valve 24 and the seventh ball valve 26 in the first pipe 5, and the pipelines on both sides of the branch end of the third branch pipe 27 are also provided with the eighth ball valve 28, the first transport pump 29, the sixth stop valve 30 and the ninth ball valve 31, which are arranged in order from the direction away from the second pipe 6. The above arrangement can ensure that the milk of lime solution prepared by the first milk of lime discharge assembly 3 can quickly enter the first settling tank 1 and the second settling tank 2.

[0041] In this embodiment, the third pipe 10 is connected to the first pipe 5 by the arrangement of the fourth branch pipe 32, so that the second electronic control valve 11 can separate the second milk of lime discharge assembly 4 from the external pipeline, and the subsequent cleaning process is more convenient; the junction end of the fourth branch pipe 32 is connected to the pipeline between the second electronic control valve 11 and the second ball valve 12 in the third pipe 10, and the branch end of the fourth branch pipe 32 is connected to the pipeline between the fifth stop valve 25 and the seventh ball valve 26 in the first pipe 5; the pipelines on both sides of the branch end of the fourth branch pipe 32 are also provided with the tenth ball valve 33, the second transport pump 34, the seventh stop valve 35 and the eleventh ball valve 36, which are arranged in order from the direction away from the third pipe 10; the above arrangement can ensure that the milk of lime solution prepared by the second milk of lime discharge assembly 4 can quickly enter the first settling tank 1 and the second settling tank 2.

[0042] The first pipe 5 is also provided with a twelfth ball valve 37 and a thirteenth ball valve 38. The twelfth ball valve 37 is provided in the first pipe 5 in a pipeline between the connection position of the second branch pipe 20 and the first pipe 5 and the connection position of the third branch pipe 27 and the first pipe 5, so that the twelfth ball valve 37 can separate the first settling tank 1 and the first milk of lime discharge assembly 3, improving the risk resistance of the entire system. The thirteenth ball valve 38 is provided in the first pipe 5 in a pipeline between the connection position of the second branch pipe 20 and the first pipe 5 and the connection position of the fourth branch pipe 32 and the first pipe 5, so that the thirteenth ball valve 38 can separate the second settling tank 2 and the second milk of lime discharge assembly 4, improving the risk resistance of the entire system.

[0043] In this embodiment, the discharge end of the first lime milk discharge assembly 3 and the third branch pipe 27 are further connected to the parent pipe 45 of the external tap water pump by means of a piping connection, so as to supply sufficient water for the preparation of lime milk solution by the first lime milk discharge assembly 3, and the subsequent cleaning process is more convenient. An eighth stop valve 39 is provided in the pipe connecting the discharge end of the first lime milk discharge assembly 3 to the parent pipe 45 of the external tap water pump, and a first manual butterfly valve 40 and a first electric butterfly valve 41 are provided in order from the direction close to the third branch pipe 27 in the pipe connecting the third branch pipe 27 to the parent pipe 45 of the external tap water pump.

[0044] In this embodiment, the discharge end of the second lime milk discharge assembly 4 and the fourth branch pipe 32 are further connected to the parent pipe 45 of the external tap water pump by means of a piping connection, so as to supply sufficient water for the preparation of lime milk solution by the second lime milk discharge assembly 4, and the subsequent cleaning process is more convenient. A ninth stop valve 42 is provided in the pipe connecting the discharge end of the second lime milk discharge assembly 4 to the parent pipe 45 of the external tap water pump, and a second manual butterfly valve 43 and a second electric butterfly valve 44 are provided in order from the direction close to the fourth branch pipe 32 in the pipe connecting the fourth branch pipe 32 to the parent pipe 45 of the external tap water pump.

[0045] In this embodiment, the second communication port of the first settling tank 1 communicates with an external chemical injection chamber 47 by means of a piping connection, so that the external chemical injection chamber 47 can add a necessary coagulant into the first settling tank 1; the third communication port of the first settling tank 1 communicates with an external drain 48 by means of a piping connection, so that the first settling tank 1 discharges treated water; the fourth communication port of the first settling tank 1 communicates with a parent pipe 45 of an external tap water pump and an external sludge pump 46 by means of a piping connection, so that the first settling tank 1 discharges wastewater and cleans the pipeline connected to the fourth communication port by the flow of water from the parent pipe 45 of the external tap water pump; and a tenth stop valve 49 is provided in the pipeline for communicating the fourth communication port of the first settling tank 1 with the parent pipe 45 of the external tap water pump. In the pipeline for connecting the fourth communication port of the first settling tank 1 with the external sludge discharge pump 46, a fourteenth ball valve 50 and a third electronically controlled valve 51 are provided in this order from the direction away from the first settling tank 1. The pipeline for connecting the fourth communication port of the first settling tank 1 with the parent pipe 45 of the external tap water pump and the pipeline for connecting the fourth communication port of the first settling tank 1 with the external sludge discharge pump 46 are connected by the arrangement of a fourth piping 52. By the arrangement of the fourth piping 52, when the pipeline connecting the fourth communication port of the first settling tank 1 with the external sludge discharge pump 46 is later cleaned, the water pressure can be balanced and the occurrence of a situation such as a pipeline burst due to a change in water pressure in the pipeline caused by clogging of the pipeline can be prevented. A third electric butterfly valve 53 and an eleventh stop valve 54 are provided in the fourth piping 52.

[0046] In this embodiment, the second communication port of the second settling tank 2 communicates with the external chemical injection chamber 47 by means of piping connection, so that the external chemical injection chamber 47 can add a necessary coagulant into the second settling tank 2; the third communication port of the second settling tank 2 communicates with the external drain 48 by means of piping connection, so that the second settling tank 2 discharges treated water; the fourth communication port of the second settling tank 2 communicates with the parent pipe 45 of the external tap water pump and the external sludge pump 46 by means of piping connection, so that the second settling tank 2 discharges sewage and cleans the pipeline connected to the fourth communication port by the flow of water from the parent pipe 45 of the external tap water pump; and a twelfth stop valve 55 is provided in the pipeline for communicating the fourth communication port of the second settling tank 2 with the parent pipe 45 of the external tap water pump. In the pipeline for connecting the fourth communication port of the second settling tank 2 with the external sludge discharge pump 46, a fifteenth ball valve 56 and a fourth electronically controlled valve 57 are provided in this order from the direction away from the second settling tank 2. The pipeline for connecting the fourth communication port of the second settling tank 2 with the parent pipe 45 of the external tap water pump and the pipeline for connecting the fourth communication port of the second settling tank 2 with the external sludge discharge pump 46 are connected by the arrangement of a fifth piping 58. By the arrangement of the fifth piping 58, when the pipeline for connecting the fourth communication port of the second settling tank 2 with the external sludge discharge pump 46 is later cleaned, the water pressure can be balanced and the occurrence of a situation such as a pipeline burst due to a change in water pressure in the pipeline caused by clogging of the pipeline can be prevented. A fourth electric butterfly valve 59 and a thirteenth stop valve 60 are provided in the fifth piping 58. Example 2

[0047] As shown in FIG. 1, this embodiment provides a method for using an online cleanable milk of lime piping system based on embodiment 1, and the method includes the following steps:

[0048] In the first embodiment, when the milk of lime piping system is in operation, all the valves except the first electronically controlled valve 7, the second electronically controlled valve 11, the first motorized butterfly valve 41, the second motorized butterfly valve 44, the third electronically controlled valve 51, the third motorized butterfly valve 53, the fourth electronically controlled valve 57, the fourth motorized butterfly valve 59, the first ball valve 8, the first stop valve 9, the second ball valve 12, the second stop valve 13, the third ball valve 16, the third stop valve 18, the fourth ball valve 19, the fifth ball valve 21, the sixth ball valve 23 and the seventh ball valve 26 are in a normally open state, and the first electronically controlled valve 7, the second electronically controlled valve 11, the first motorized butterfly valve 41, the second motorized butterfly valve 44, the third electronically controlled valve 51, the third motorized butterfly valve 53, the fourth electronically controlled valve 57, the fourth motorized butterfly valve 59, the first ball valve 8, the first stop valve 9, the second ball valve 12, the second stop valve 13, the third ball valve 16, the third stop valve 18, the fourth ball valve 19, the fifth ball valve 21, the sixth ball valve 23 and the seventh ball valve 26 can be opened or closed according to actual needs. The second electronic control valve 11, the first motorized butterfly valve 41, the second motorized butterfly valve 44, the third electronic control valve 51, the third motorized butterfly valve 53, the fourth electronic control valve 57 and the fourth motorized butterfly valve 59 are changed in their open / close states, and when it is necessary to add the lime milk solution prepared by the first lime milk discharge assembly 3 and the second lime milk discharge assembly 4 to the first settling tank 1 and the second settling tank 2, the first electronic control valve 7 and the second electronic control valve 11 are opened, and cooperate with the first transport pump 29 and the second transport pump 34 to transport the lime milk solution, and the first lime milk discharge assembly When the water content of the lime milk solution prepared by the third and second lime milk discharge assemblies 4 is insufficient, the first motorized butterfly valve 41 and the second motorized butterfly valve 44 are opened, and cooperate with the parent pipe 45 of the external tap water pump to supply water to the lime milk solution; when the first settling tank 1 and the second settling tank 2 need to discharge wastewater, the third electronically controlled valve 51 and the fourth electronically controlled valve 57 are opened, and cooperate to discharge wastewater; when the wastewater discharge pipeline connected to the fourth communication ports of the first settling tank 1 and the second settling tank 2 need to be cleaned, the third electronically controlled valve 52 and the fourth electronically controlled valve 53 are opened, and cooperate to discharge wastewater; The butterfly valve 53 and the fourth motorized butterfly valve 59 are opened to balance the water pressure, and the first ball valve 8, the first stop valve 9, the second ball valve 12, the second stop valve 13, the third ball valve 16, the third stop valve 18, the fourth ball valve 19, the fifth ball valve 21, the sixth ball valve 23 and the seventh ball valve 26 are normally closed, and at the same time, during the operation process, one set of the two sets of piping systems separated by the seventh ball valve 26 is operated, and the other set of piping system is not operated so as to be used as an alternative piping system.

[0049] When the milk of lime piping system is clogged, the clogged form of the milk of lime piping system is judged based on the phenomenon caused by the clogging. For convenience of understanding, in this embodiment, it is assumed that the clogged piping system is a piping system with a first settling tank 1, that is, the piping system with the first settling tank 1 is working, and the specific judgment method is as follows: When the first settling tank 1 is working, the pH value of the input water is monitored in real time, and when the pH value drops, the first milk of lime discharge assembly 3 is checked on-site to see whether the internal liquid level drops, and if the internal liquid level drops, it means that the working piping system is not clogged. The user needs to check whether the pH value of the first settling tank 1 drops due to the internal mechanical failure of the first settling tank 1, and if the internal liquid level does not drop, it means that the working piping system is clogged. Then, the seventh ball valve 26 is opened, and the two sets of piping systems separated by the seventh ball valve 26 are communicated, and at the same time, the second settling tank 2 is connected to the second settling tank 2. The piping system is started, and then the pH value of the first settling tank 1 is monitored while feeding the chemicals. If the change in the pH value increases, it means that the second transport pump 34 can easily transport the prepared lime milk by the second lime milk discharge assembly 4 to the first settling tank 1, that is, it can be determined that the clogging mode is that the mouth position of the first transport pump 29 is clogged; if the pH value of the first settling tank 1 still does not change, and at the same time, the pressure of the second transport pump 34 gradually increases, and the material level in the second lime milk discharge assembly 4 does not decrease, it can be determined that the clogging mode is that the pipe in the piping system with the first settling tank 1 has a clogging phenomenon caused by lime milk;

[0050] If the clogging type is clogging caused by milk of lime in the piping, close the first electronic control valve 7, the fourth stop valve 24, the first motorized butterfly valve 41 and the ninth ball valve 31, and separate the piping in the piping system having the first settling tank 1 from the first settling tank 1, the first milk of lime discharge assembly 3, the first transport pump 29, the parent pipe 45 of the external tap water pump and the external sludge discharge pump 46. Then, open the first stop valve 9, the third ball valve 16, the third stop valve 18, the fourth ball valve 19 and the fifth ball valve 21 in the corresponding branch end pipe of the second branch pipe 20 communicating with the first pipe 5. At the same time, control the chemical dosing pump 17 to operate. The chemical dosing pump 17 injects the chemical solution in the chemical dosing cleaning box 14 into the piping system having the first settling tank 1 and circulates it in the piping system. Since the added chemical solution is acidic, it reacts with the attached milk of lime. As a result, the milk of lime adhering to the milk of lime piping system can be removed. The pH value of the chemical solution in the chemical dosing cleaning box 14 is measured in real time. When the pH value of the chemical solution drops, the chemical solution is added to stabilize the pH value of the chemical solution in the chemical dosing cleaning box 14. When the pH value of the chemical solution is stabilized, the circulation of the chemical solution is stopped and the system is immersed for a certain period of time. In this embodiment, the immersion period is 24 hours, and the specific immersion period is determined according to the actual length of the milk of lime piping. After immersion, the first motorized butterfly valve 41, the second motorized butterfly valve 44 and the sixth ball valve 23 are opened, and the milk of lime piping system is washed with water from the parent pipe 45 of the external tap water pump. The liquid after washing is returned to the chemical dosing cleaning box 14 and then flows into the external collection tank 22. In this case, the amount of milk of lime adhering to the treated milk of lime piping system is greatly reduced.

[0051] If the clogging type is a clogging at the mouth of the first transport pump 29, close the first electronic control valve 7, the fourth stop valve 24, the first motorized butterfly valve 41 and the ninth ball valve 31 to separate the piping in the piping system having the first settling tank 1 from the first settling tank 1, the first milk of lime discharge assembly 3, the first transport pump 29, the parent pipe 45 of the external tap water pump and the external drainage pump 46, and then open the first ball valve 8, the third ball valve 16, the third stop valve 18, the fourth ball valve 19 and the fifth ball valve 21 in the corresponding branch end pipe of the second branch pipe 20 communicating with the first pipe 5. At the same time, control the chemical dosing pump 17 to operate, and the chemical dosing pump 17 injects the chemical liquid in the chemical dosing cleaning box 14 into the piping system, circulates it in the piping system, and disposes the added chemical. Since the liquid is acidic, it can react with the adhering milk of lime, and as a result, the milk of lime adhering to the milk of lime piping system can be removed. In addition, the pH value of the chemical solution in the chemical cleaning box 14 is measured in real time. When the pH value of the chemical solution drops, chemical solution is added to stabilize the pH value of the chemical solution in the chemical cleaning box 14. When the pH value of the chemical solution is stabilized, the circulation of the chemical solution is stopped and the system is soaked for 24 hours. After the soaking is completed, the first motorized butterfly valve 41, the second motorized butterfly valve 44 and the sixth ball valve 23 are opened, and the milk of lime piping system is cleaned with water from the parent pipe 45 of the external tap water pump. The liquid after cleaning flows back into the chemical cleaning box 14 and then flows into the external collection tank 22. In this case, the amount of adhering milk of lime in the treated milk of lime piping system is significantly reduced.

[0052] At the same time, in the process of cleaning the piping system with the first settling tank 1, the second electronically controlled valve 11, the fifth stop valve 25, the second motorized butterfly valve 44 and the eleventh ball valve 36 can be opened, and the second settling tank 2 and the second lime milk discharge assembly 4 can be controlled to operate, that is, to start up the piping system with the second settling tank 2, which takes the place of the piping system with the first settling tank 1 to treat water, so as to ensure the stability of the entire water supply system and avoid the situation of water supply interruption as much as possible.

[0053] In the present invention, unless otherwise specified, the terms "attach", "provide", "connect", "fixed" and "rotatably connected" should be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrated, mechanically connected, electrically connected, directly connected, or indirectly connected via an intermediary, internal communication between two elements, or an interactive relationship between two elements. Unless otherwise specified, those skilled in the art should understand the meaning of the above terms in the present invention according to the specific circumstances.

[0054] The above contents are only typical examples of the present invention, in addition to them, the present invention may have various other embodiments, and all technical solutions obtained by equivalent substitution or equivalent transformation are all included in the protection scope of the present invention.

[0055] Explanation of symbols 1. 1st settling tank, 2. 2nd settling tank, 3. 1st lime milk discharge assembly, 4. 2nd lime milk discharge assembly, 5. 1st pipe, 6. 2nd pipe, 7. 1st electronic control valve, 8. 1st ball valve, 9. 1st stop valve, 10. 3rd pipe, 11. 2nd electronic control valve, 12. 2nd ball valve, 13. 2nd stop valve, 14. Chemical dosing cleaning box, 15. 1st branch pipe, 16. 3rd ball valve, 17. Chemical dosing pump, 18. 3rd stop valve, 19. 4th ball valve, 20. 2nd branch pipe, 21. 5th ball valve, 22. External collection tank, 23. 6th ball valve, 24. 4th stop valve, 25. 5th stop valve, 26. 7th ball valve, 27. 3rd branch pipe, 28. 8th ball valve, 29. 1st transfer pump, 30. 6th stop valve, 31. 9th ball valve , 32. 4th branch pipe, 33. 10th ball valve, 34. 2nd transport pump, 35. 7th stop valve, 36. 11th ball valve, 37. 12th ball valve, 38. 13th ball valve, 39. 8th stop valve, 40. 1st manual butterfly valve, 41. 1st motorized butterfly valve, 42. 9th stop valve, 43. 2nd manual butterfly valve, 44. 2nd motorized butterfly valve, 45. Parent pipe of external tap water pump, 4 6. External sludge pump, 47. External dosing chamber, 48. External drain, 49. Tenth stop valve, 50. Fourteenth ball valve, 51. Third electronically controlled valve, 52. Fourth line, 53. Third motorized butterfly valve, 54. Eleventh stop valve, 55. Twelfth stop valve, 56. Fifteenth ball valve, 57. Fourth electronically controlled valve, 58. Fifth line, 59. Fourth motorized butterfly valve, 60. Thirteenth stop valve.

Claims

1. A milk of lime piping system comprising a first settling tank (1), a second settling tank (2), a first milk of lime discharge assembly (3) and a second milk of lime discharge assembly (4), wherein a first communication port of the first settling tank (1) is connected to a first communication port of the second settling tank (2) by a first piping (5) arrangement; The discharge end of the first milk of lime discharge assembly (3) is connected to the first pipe (5) by the arrangement of the second pipe (6), and the pipeline of the second pipe (6) is provided with a first electric control valve (7), a first ball valve (8) and a first stop valve (9) in this order from the side closer to the first milk of lime discharge assembly (3); The discharge end of the second milk of lime discharge assembly (4) is connected to the first pipe (5) by the arrangement of a third pipe (10), and a second electric control valve (11), a second ball valve (12) and a second stop valve (13) are provided in this order in the third pipe (10) from the side closer to the second milk of lime discharge assembly (4); The piping system further includes a chemical injection cleaning box (14), a first communication port of the chemical injection cleaning box (14) communicates with the second pipe (6) and the third pipe (10) by the arrangement of a first branch pipe (15), a branch end of the first branch pipe (15) communicates with the second pipe (6) and the third pipe (10), and a third ball valve (16), a chemical injection pump (17), a third stop valve (18), and a fourth ball valve (19) are provided in this order from the side closer to the chemical injection cleaning box (14) in the pipeline of the joining end of the first branch pipe (15); The second communication port of the chemical injection cleaning box (14) is connected to the first pipe (5) by the arrangement of a second branch pipe (20), one of the branches of the second branch pipe (20) is connected to one of the branches of the first pipe (5) that is closer to the first settling tank (1), and the other of the branches of the second branch pipe (20) is connected to one of the branches of the first pipe (5) that is closer to the second settling tank (2), and fifth ball valves (21) are also provided at the two ends of the pipes on both sides of the branches of the second branch pipe (20). The third communication port of the chemical injection cleaning box (14) is connected to an external collection tank (22) by a piping connection means, and a sixth ball valve (23) is provided in a pipeline for connecting the third communication port of the chemical injection cleaning box (14) to the external collection tank (22); The first pipe (5) is also provided with a fourth stop valve (24), a fifth stop valve (25) and a seventh ball valve (26). The fourth stop valve (24) is provided near the first settling tank (1). The position of the fourth stop valve (24) provided in the first pipe (5) is closer to the first settling tank (1) than the connection position between the second branch pipe (20) and the one side of the first pipe (5) that is closer to the first settling tank (1). The fifth stop valve (25) is provided near the second settling tank (1). the fifth stop valve (25) provided in the first pipe (5) is located near the second settling tank (2) and is closer to the second settling tank (2) than the connection position between the second branch pipe (20) and the one side of the first pipe (5) that is closer to the second settling tank (2); the seventh ball valve (26) is provided in the first pipe (5) between the position of the second pipe (6) connected to the first pipe (5) and the position of the third pipe (10) connected to the first pipe (5); This is a milk of lime piping system, characterized in that the milk of lime piping system is controlled to flow a chemical in the chemical injection cleaning box (14) into the milk of lime piping, thereby making it possible to clean the milk of lime piping.

2. 2. The milk of lime piping system according to claim 1, characterized in that the second pipe (6) is connected to the first pipe (5) by the arrangement of a third branch pipe (27), a junction end of the third branch pipe (27) is connected to a pipeline between the first electronic control valve (7) and the first ball valve (8) in the second pipe (6), a branch end of the third branch pipe (27) is connected to a pipeline between the fourth stop valve (24) and the seventh ball valve (26) in the first pipe (5), and an eighth ball valve (28), a first transport pump (29), a sixth stop valve (30) and a ninth ball valve (31) arranged in this order from the side closer to the second pipe (6) are provided in the pipelines on both sides of the branch end of the third branch pipe (27).

3. 2. The milk of lime piping system according to claim 1, characterized in that the third pipe (10) is connected to the first pipe (5) by the arrangement of a fourth branch pipe (32), a junction end of the fourth branch pipe (32) is connected to a pipeline between the second electronic control valve (11) and the second ball valve (12) in the third pipe (10), a branch end of the fourth branch pipe (32) is connected to a pipeline between the fifth stop valve (25) and the seventh ball valve (26) in the first pipe (5), and a tenth ball valve (33), a second transport pump (34), a seventh stop valve (35) and an eleventh ball valve (36) arranged in this order from the side closest to the third pipe (10) are provided in the pipelines on both sides of the branch end of the fourth branch pipe (32).

4. 3. The milk of lime piping system according to claim 2, characterized in that a twelfth ball valve (37) is also provided in the first pipe (5), and the twelfth ball valve (37) is provided in a pipeline between a connection point between the second branch pipe (20) and the first pipe (5) and a connection point between the third branch pipe (27) and the first pipe (5).

5. 4. The milk of lime piping system according to claim 3, characterized in that a thirteenth ball valve (38) is also provided in the first pipe (5), and the thirteenth ball valve (38) is provided in a pipeline between a connection point between the second branch pipe (20) and the first pipe (5) and a connection point between the fourth branch pipe (32) and the first pipe (5).

6. The lime milk piping system according to claim 2, characterized in that the discharge end of the first lime milk discharge assembly (3) and the third branch pipe (27) are further connected to a parent pipe (45) of an external tap water pump by a piping connection means, an eighth stop valve (39) is provided in the pipe for connecting the discharge end of the first lime milk discharge assembly (3) to the parent pipe (45) of the external tap water pump, and a first manual butterfly valve (40) and a first electric butterfly valve (41) are provided in this order from the side farthest from the third branch pipe (27) in the pipe for connecting the third branch pipe (27) to the parent pipe (45) of the external tap water pump.

7. The lime milk piping system according to claim 2, characterized in that the discharge end of the second lime milk discharge assembly (4) and the fourth branch pipe (32) are further connected to a parent pipe (45) of an external tap water pump by a piping connection means, a ninth stop valve (42) is provided in the pipe for connecting the discharge end of the second lime milk discharge assembly (4) to the parent pipe (45) of the external tap water pump, and a second manual butterfly valve (43) and a second electric butterfly valve (44) are provided in this order from the side farther from the fourth branch pipe (32) in the pipe for connecting the fourth branch pipe (32) to the parent pipe (45) of the external tap water pump.

8. The second communication port of the first settling tank (1) communicates with an external chemical injection chamber (47) by means of piping connection, the third communication port of the first settling tank (1) communicates with an external drain (48) by means of piping connection, and the fourth communication port of the first settling tank (1) communicates with a parent pipe (45) of an external tap water pump and an external sludge discharge pump (46) by means of piping connection, respectively. A tenth stop valve (49) is provided in the pipeline for communicating the fourth communication port of the first settling tank (1) with the parent pipe (45) of the external tap water pump, and a tenth stop valve (49) is provided in the pipeline for communicating the fourth communication port of the first settling tank (1) with the parent pipe (45) of the external tap water pump.

2. The milk of lime piping system according to claim 1, characterized in that in the pipeline for the pump (46), a 14th ball valve (50) and a third electronically controlled valve (51) are provided in that order from the side closer to the first settling tank (1), and a pipeline for connecting the fourth communication port of the first settling tank (1) to the parent pipe (45) of the external tap water pump and a pipeline for connecting the fourth communication port of the first settling tank (1) to the external sludge discharge pump (46) are connected by the arrangement of a fourth pipe (52), and a third electric butterfly valve (53) and an 11th stop valve (54) are provided in the fourth pipe (52).

9. The second communication port of the second settling tank (2) communicates with an external chemical injection chamber (47) by means of piping connection, the third communication port of the second settling tank (2) communicates with an external drain (48) by means of piping connection, and the fourth communication port of the second settling tank (2) communicates with a parent pipe (45) of an external tap water pump and an external sludge discharge pump (46) by means of piping connection, respectively. A twelfth stop valve (55) is provided in the pipeline for communicating the fourth communication port of the second settling tank (2) with the parent pipe (45) of the external tap water pump, and a fourth communication port of the second settling tank (2) communicates with an external drain (48) by means of piping connection.

2. The milk of lime piping system according to claim 1, characterized in that in the pipeline for the pump (46), a fifteenth ball valve (56) and a fourth electronically controlled valve (57) are provided in that order from the side closer to the second settling tank (2), and a pipeline for connecting the fourth communication port of the second settling tank (2) to the parent pipe (45) of the external tap water pump and a pipeline for connecting the fourth communication port of the second settling tank (2) to the external sludge discharge pump (46) are connected by the arrangement of a fifth pipe (58), and a fourth electric butterfly valve (59) and a thirteenth stop valve (60) are provided in the fifth pipe (58).

Images