Reverse water inlet pipeline device of lime slurry preparation system

Abstract

The utility model discloses a reverse water inlet pipeline device of a lime slurry preparation system, which comprises a lime slurry preparation tank and a feed pump, a discharge port of the lime slurry preparation tank is connected with a plurality of filter branches in parallel through a multi-way valve, discharge ports of the filter branches are connected with a feed port of the feed pump in parallel through a multi-way valve, and the feed pump is connected with the discharge port of the lime slurry preparation tank. A filter is arranged on each filter branch, and a water inlet branch is connected in parallel with the filter branch at a discharge port of each filter through a corresponding third three-way valve, so that the condition of one use and multiple standby is formed, the continuity of the flow is ensured, meanwhile, each pipeline can be switched between the slurry discharge pipeline and the water inlet pipeline, and when the slurry discharge pipeline is blocked, the water inlet pipeline can be switched between the slurry discharge pipeline and the water inlet pipeline. The filter screen of the filter can be backwashed through water entering the filter outlet when water enters the filter, so that blockage is prevented, the service life of the filter is ensured, and the maintenance frequency is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lime slurry preparation technology, specifically a reverse water inlet pipe device for a lime slurry preparation system. Background Technology

[0002] In the semi-dry lime slurry preparation system of a waste incineration power plant, the lime slurry preparation tank is usually fed water from the top of the tank, as shown in the "Anti-clogging Lime Slurry Conveying System" with application number CN201821255009.7. During slurry discharge, there is a filter screen or filter in the pipeline for filtration. If the slurry discharge is too frequent or the time is too long, the filter screen is easily clogged by fine lime slurry deposits, resulting in difficulty in slurry discharge or even no slurry discharge. Utility Model Content

[0003] This utility model provides a reverse water inlet pipe device for a lime slurry preparation system, which aims to solve the problem that in the existing slurry discharge process, the filter screen is easily blocked by fine lime slurry deposits due to excessive discharge frequency and time, resulting in difficulty in discharging slurry or even no discharge at all.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A reverse water inlet pipeline device for a lime slurry preparation system includes a lime slurry preparation tank and a feeding pump. The outlet of the lime slurry preparation tank is connected in parallel to several filter branches through a multi-way valve. The outlets of the filter branches are all connected in parallel to the inlet of the feeding pump through multi-way valves. Each filter branch is equipped with a filter. Each filter branch located at the outlet of the filter is connected in parallel to a water inlet branch through a corresponding third three-way valve.

[0006] Preferably, the water inlet branch is connected to the water supply source for lime slurry preparation.

[0007] More preferably, pressure sensors are provided on all filter branches located at the filter inlet and on all filter branches located between the filter outlet and the third three-way valve.

[0008] Furthermore, the third three-way valve is an electric three-way valve.

[0009] Preferably, the filtering branch has at least two paths.

[0010] More preferably, when there are two filtration branches, the outlet of the lime slurry preparation tank is connected in parallel with the inlet of the two filtration branches through a first three-way valve, and the outlet of the two filtration branches is connected in parallel with the inlet of the feeding pump through a second three-way valve.

[0011] Furthermore, both the first three-way valve and the second three-way valve are electrically operated three-way valves.

[0012] Furthermore, the first three-way valve, the second three-way valve, the third three-way valve, and the pressure sensor are all electrically connected to an external PLC controller, and the pressure sensor is linked with the first three-way valve, the second three-way valve, and the third three-way valve through the external PLC controller.

[0013] Specifically, the external PLC controller is electrically connected to the factory terminal via a wireless communication device.

[0014] The beneficial effects of this utility model are:

[0015] By changing the water inlet for lime slurry preparation from the original top-mounted water inlet to a filter-inlet water inlet in the slurry discharge pipe, in actual operation, whenever the lime slurry preparation system is started and enters the slurry preparation stage, the water flow is precisely injected from the filter-inlet branch. In this way, the water flow carries a certain impact force upon entering the system, directly acting on the filter screen surface. This water flow continuously washes the filter screen, keeping the lime slurry filter screen in a dynamic process of constant rinsing. This reduces the number of production interruptions caused by downtime for cleaning the filter screen, and significantly extends the service life of the filter screen. Because it reduces physical wear caused by clogging and damage caused by improper cleaning, the frequency of filter screen replacement is reduced. On the other hand, the multiple filtration branches with one main filter and multiple backups also ensure the continuity of production. Attached Figure Description

[0016] Figure 1 This is a system connection diagram for discharging slurry according to this utility model;

[0017] Figure 2 This is a system connection diagram for water intake according to this utility model;

[0018] Figure 3 This is a control connection diagram of the present invention;

[0019] In the diagram: 1. Lime slurry preparation tank; 2. First three-way valve; 3. Filter branch; 4. Second three-way valve; 5. Feed pump; 6. Pressure sensor; 7. Filter; 8. Third three-way valve; 9. Water inlet branch. Detailed Implementation

[0020] The embodiments will be further described below with reference to the accompanying drawings.

[0021] like Figures 1-3As shown in the preferred embodiment 1, a backflow inlet pipe device for a lime slurry preparation system includes a lime slurry preparation tank 1 and a feed pump 5. The outlet of the lime slurry preparation tank 1 is connected in parallel with several filter branches 3 through a multi-way valve. The outlets of the filter branches 3 are all connected in parallel with the inlet of the feed pump 5 through multi-way valves. Each filter branch 3 is equipped with a filter 7. Each filter branch 3 located at the outlet of the filter 7 is connected in parallel with a water inlet branch 9 through a corresponding third three-way valve 8.

[0022] Example 1 provides a reverse water inlet pipe device for a lime slurry preparation system. By connecting several parallel filter branches 3, a one-use-multiple-standby configuration can be formed. In the face of different situations, such as when the filter 7 is clogged or under maintenance, the line can be switched to ensure the normal supply of lime slurry.

[0023] Each of the filter branches 3 can be switched between water inlet and slurry discharge modes by opening and closing valves, thus combining the water inlet and discharge pipelines of the lime slurry preparation tank 1 into one:

[0024] like Figure 1 As shown, the slurry discharge mode is as follows: the third three-way valve 8 connects the filter branch 3 and the feed pump 5. The lime slurry flows from the lime slurry preparation tank 1 through the filter 7 of the filter branch 3 to the feed pump 5 and enters the next stage.

[0025] like Figure 2 As shown, the water inlet mode is as follows: the third three-way valve 8 connects the filter branch 3 and the water inlet branch 9. The pressurized water in the water inlet branch 9 flows to the filter 7 in the filter branch 3 after passing through the third three-way valve 8, and backwashes the filter 7 to remove the blockage on its filter screen. The cleaned water is finally introduced into the lime slurry preparation tank 1 for lime slurry preparation, which can effectively prevent blockage and increase the service life of the filter 7.

[0026] In a preferred embodiment 2, the water inlet branch 9 is connected to the lime slurry preparation water supply source. The water supply source is usually an industrial water pipeline, powered by an industrial water pump. Therefore, pressurized water is selected in the water inlet branch 9 to ensure the flushing effect.

[0027] In a preferred embodiment 3, pressure sensors 6 are installed on each of the filter branch 3 located at the inlet of the filter 7 and on each of the filter branch 3 located between the outlet of the filter 7 and the third three-way valve 8. This facilitates reading the pressure signals at the inlet and outlet of the filter 7, thereby obtaining the pressure difference. The smaller the pressure difference, the less severe the blockage.

[0028] The third three-way valve 8 is an electrically operated three-way valve, which facilitates automatic control.

[0029] In a preferred embodiment 4, the filter branch 3 has at least two branches.

[0030] When there are two filter branches 3, the outlet of the lime slurry preparation tank 1 is connected in parallel with the inlet of the two filter branches 3 through the first three-way valve 2, and the outlet of the two filter branches 3 is connected in parallel with the inlet of the feed pump 5 through the second three-way valve 4.

[0031] Both the first three-way valve 2 and the second three-way valve 4 are electrically operated three-way valves, facilitating automatic control.

[0032] like Figure 3 As shown, in a more preferred embodiment 5, the first three-way valve 2, the second three-way valve 4, the third three-way valve 8 and the pressure sensor 6 are all electrically connected to an external PLC controller, and the pressure sensor 6 is linked with the first three-way valve 2, the second three-way valve 4 and the third three-way valve 8 through the external PLC controller.

[0033] Automatic control and switching can be formed. Taking the above two filter branches 3 as an example, for ease of explanation, they are named A and B. Initially, A is the slurry discharge pipe, while B is the water inlet pipe in standby. At this time, only A is connected between the lime slurry preparation tank 1 and the feed pump 5.

[0034] When the differential pressure signal of the A channel exceeds the set value, there may be blockage or other issues affecting normal slurry discharge. At this time, the external PLC controller switches the valves to ensure that only the B channel is connected between the lime slurry preparation tank 1 and the feeding pump 5 as the slurry discharge pipeline until the slurry discharge is completed.

[0035] When the next preparation step is started, the external PLC controller switches the valve so that only the A line is connected between the water inlet branch 9 and the lime slurry preparation tank 1 as the water inlet pipe. During the water inlet process, the filter screen of filter 7 on the A line is continuously backwashed and monitored in real time by the differential pressure signal. The smaller the differential pressure signal, the more complete the blockage is cleared. When it is less than the set value, it serves as the water inlet pipe and the backup slurry discharge pipe waiting to be switched. When it is not less than the set value, it always serves as the water inlet pipe for backwashing.

[0036] When the differential pressure signals of both pipelines used as slurry discharge pipelines are very large and the differential pressure signals are also large during flushing, notify maintenance personnel to carry out maintenance and repair.

[0037] The external PLC controller is electrically connected to the plant terminal via a wireless communication device. The plant terminal can be a computer in the control room or a control display screen. The operating pressure signal and operating status of the pipeline can be read remotely, laying the foundation for remote control and improving management efficiency.

[0038] The working principle of this utility model:

[0039] The water inlet for lime slurry preparation was changed from the original top water inlet to the water inlet through the slurry discharge pipe and the filter screen inlet. In actual operation, whenever the lime slurry preparation system is turned on and enters the slurry preparation stage, the water flow will be precisely injected from the filter screen inlet branch 9. In this way, the water flow will carry a certain impact force at the moment it enters the system and directly act on the filter screen surface of the filter 7. This water flow can continuously flush the filter screen, so that the lime slurry filter screen is always in a dynamic process of being flushed.

[0040] Compared to traditional methods, the filter screen no longer passively waits for clogging and then needs cleaning. Instead, it can be cleaned in a timely and effective manner during each cycle of daily pulping. The probability of filter screen clogging is greatly reduced, and the clogging problem that used to occur frequently due to the accumulation of lime particles is effectively curbed. This reduces the number of production interruptions caused by downtime for cleaning the filter screen, and the service life of the filter screen is significantly extended. Because the physical wear caused by clogging and the damage caused by improper cleaning are reduced, the frequency of filter screen replacement is reduced. This not only saves a lot of equipment maintenance costs, but also reduces the time cost spent on replacing parts.

[0041] On the other hand, the multi-filter branch 3, which allows for multiple backups for one use, also ensures the continuity of production.

Claims

1. A reverse-flow pipeline device for a lime slurry preparation system, comprising a lime slurry preparation tank (1) and a feed pump (5), characterized in that, The outlet of the lime slurry preparation tank (1) is connected in parallel with several filter branches (3) through a multi-way valve. The outlets of the filter branches (3) are all connected in parallel with the inlet of the feed pump (5) through a multi-way valve. Each filter branch (3) is equipped with a filter (7). The filter branches (3) located at the outlet of the filter (7) are all connected in parallel with a water inlet branch (9) through a corresponding third three-way valve (8).

2. The reverse water inlet pipe device for a lime slurry preparation system according to claim 1, characterized in that, The water inlet branch (9) is connected to the lime slurry preparation water supply source.

3. The reverse water inlet pipe device for a lime slurry preparation system according to claim 2, characterized in that, Pressure sensors (6) are provided on the filter branch (3) located at the feed inlet of the filter (7) and on the filter branch (3) located between the discharge outlet of the filter (7) and the third three-way valve (8).

4. The reverse water inlet pipe device for a lime slurry preparation system according to claim 3, characterized in that, The third three-way valve (8) is an electric three-way valve.

5. A reverse-flow pipeline device for a lime slurry preparation system according to any one of claims 1 to 4, characterized in that, The filter branch (3) has at least two paths.

6. The reverse water inlet pipe device for a lime slurry preparation system according to claim 5, characterized in that, When the filter branch (3) is two, the outlet of the lime slurry preparation tank (1) is connected in parallel with the inlet of the two filter branches (3) through the first three-way valve (2), and the outlet of the two filter branches (3) is connected in parallel with the inlet of the feed pump (5) through the second three-way valve (4).

7. The reverse water inlet pipe device for a lime slurry preparation system according to claim 6, characterized in that, Both the first three-way valve (2) and the second three-way valve (4) are electric three-way valves.

8. The reverse water inlet pipe device for a lime slurry preparation system according to claim 7, characterized in that, The first three-way valve (2), the second three-way valve (4), the third three-way valve (8) and the pressure sensor (6) are all electrically connected to an external PLC controller, and the pressure sensor (6) is linked with the first three-way valve (2), the second three-way valve (4) and the third three-way valve (8) through the external PLC controller.

9. A reverse-flow pipeline device for a lime slurry preparation system according to claim 8, characterized in that, The external PLC controller is connected to the user terminal in the factory via a wireless communication device.

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