Pretreatment device and ammonia nitrogen analyzer

Abstract

The utility model discloses a pretreatment device and an ammonia nitrogen analyzer, and belongs to the technical field of chemical detection equipment. The pretreatment device is used for filtering sewage entering an ammonia nitrogen analyzer and comprises a filtering unit connected with a liquid collector of the ammonia nitrogen analyzer, and an anti-blocking unit is arranged between the filtering unit and the liquid collector of the ammonia nitrogen analyzer and used for pretreating the sewage entering the liquid collector; the water inlet end of the filtering unit is connected with a water supply pipeline, the water outlet end of the filtering unit is connected with a three-way valve, and the three-way valve is further connected with a liquid inlet pipeline of the liquid collector; the anti-blocking unit comprises a blowback air pump and a blowback gas conveying pipe, one end of the blowback gas conveying pipe is connected with the blowback air pump, and the other end of the blowback gas conveying pipe is connected with the three-way valve. According to the pretreatment device disclosed by the utility model, the blockage of the filter unit can be avoided through the arranged anti-blocking unit, the problem that normal measurement of an instrument is influenced by abnormal sample introduction caused by blockage of the ammonia nitrogen analyzer is solved, the loss of the ammonia nitrogen analyzer is reduced, and the service life of the ammonia nitrogen analyzer is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical testing equipment, in particular to a pretreatment device and an ammonia nitrogen analyzer. Background Art

[0002] In the front-end device of sewage treatment in chemical plants, the medium is generally turbid and the pressure is unstable, which leads to abnormal sampling of the ammonia nitrogen analyzer, manifested as blockage of the sampling tube, blockage of the drainage tube, blockage of the sampling joint and pollution of the reactor, affecting the normal measurement of the ammonia nitrogen analyzer; at the same time, the ammonia nitrogen analyzer is measured under such abnormal working conditions for a long time, which has a great impact on the loss and life of the ammonia nitrogen analyzer;

[0003] In the current prior art, in order to overcome the above problems encountered by the ammonia nitrogen analyzer, the filter is generally removed from the pipeline for cleaning, and then installed back for continued use, or the filter is directly replaced. However, in the above two methods, frequent replacement of the filter is not conducive to cost control, and the method of removing and then cleaning is cumbersome to operate and will increase the manpower maintenance cost. Therefore, the utility model proposes a pretreatment device and an ammonia nitrogen analyzer. Utility Model Content

[0004] The purpose of the utility model is to overcome the problems in the prior art and to provide a pretreatment device and an ammonia nitrogen analyzer, which can solve the problem that the ammonia nitrogen analyzer is blocked and causes abnormal sampling, affecting the normal measurement of the instrument, reduce the loss of the ammonia nitrogen analyzer, and increase its service life.

[0005] The utility model provides a pretreatment device for filtering sewage entering an ammonia nitrogen analyzer, comprising a filter unit connected to a liquid collector of the ammonia nitrogen analyzer, an anti-blocking unit being arranged between the filter unit and the liquid collector of the ammonia nitrogen analyzer, and the anti-blocking unit being used for pre-treating sewage entering a collector;

[0006] The water inlet end of the filter unit is connected to the water supply pipe, and the water outlet end of the filter unit is connected to a three-way valve, and the three-way valve is also connected to the liquid inlet pipe of the liquid collector; the anti-blocking unit includes a backblowing air pump and a backblowing gas delivery pipe, one end of the backblowing gas delivery pipe is connected to the backblowing air pump, and the other end is connected to the three-way valve.

[0007] Preferably, a check valve is provided on the backflush gas delivery pipe, and the check valve is used to prevent the backflush gas in the backflush gas delivery pipe from flowing back.

[0008] Preferably, the filtration unit is a membrane filtration unit made of PE material, and the filtration gap is no greater than 5um.

[0009] Preferably, it further comprises a micro diaphragm pump, wherein the micro diaphragm pump is arranged on the liquid inlet pipe between the three-way valve and the liquid collector.

[0010] Preferably, a flow meter is provided on the liquid inlet pipeline.

[0011] Preferably, a pressure gauge is also provided on the backwash gas delivery pipe.

[0012] Preferably, an ammonia nitrogen analyzer comprises the above-mentioned pretreatment device.

[0013] Compared with the prior art, the beneficial effects of the utility model are: the pretreatment device of the utility model can better avoid the blockage of the filter unit and the liquid inlet pipeline through the anti-blocking unit, can solve the problem of abnormal sampling caused by blockage of the ammonia nitrogen analyzer affecting the normal measurement of the instrument, reduce the loss of the ammonia nitrogen analyzer, and increase its service life.

[0014] In the utility model, a three-way valve is provided so that the back-blowing gas and the sewage conveying pipeline partially overlap, so that the back-blowing gas can not only clean the filter unit, but also can back-blow the pipeline portion between the filter unit and the liquid collector that is closer to the filter unit, thereby avoiding back-blowing the pipeline section between the filter unit and the liquid collector that is more prone to blockage, ensuring that the pipeline between the filter unit and the liquid collector is unobstructed, and ensuring the normal sampling of the ammonia nitrogen analyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0016] Figure 2 The structure of the embodiment of the utility model is shown in FIG. Figure 2 ;

[0017] Figure 3 The structure of the embodiment of the utility model is shown in FIG. Figure 3 .

[0018] Description of reference numerals:

[0019] 1. Liquid collector, 2. Filter unit, 3. Anti-blocking unit, 31. Back-blowing air pump, 32. Back-blowing gas delivery pipe, 4. Three-way valve, 5. Liquid inlet pipeline, 6. Check valve, 7. Micro diaphragm pump, 8. Control box. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0021] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] At present, ammonia nitrogen analyzers are used to analyze ammonia nitrogen in chemical wastewater. However, since the wastewater medium entering the ammonia nitrogen analyzer is relatively turbid and the pressure is unstable, the sampling of the ammonia nitrogen analyzer is abnormal, which is manifested as clogging of the sampling tube, clogging of the drain tube, clogging of the sampling joint and pollution of the reactor, etc., affecting the normal measurement of the ammonia nitrogen analyzer; at the same time, the ammonia nitrogen analyzer is measured under such abnormal working conditions for a long time, which has a great influence on the loss and life of the ammonia nitrogen analyzer, and it is troublesome to disassemble the filter, and the cost of frequent replacement is also relatively high. Therefore, the utility model proposes a pretreatment device and an ammonia nitrogen analyzer, which can pretreat the wastewater entering the ammonia nitrogen analyzer, and at the same time, can clean the filter to avoid clogging.

[0023] The filter unit in the utility model can select a new filter unit that is strong and lightweight, resistant to high temperature, can withstand high filtering pressure, is resistant to acid and alkali, and resistant to corrosion. By improving the filtering efficiency of the filter unit, the normal operation of the ammonia nitrogen analyzer is ensured. At the same time, due to the intermittent cleaning of the filter unit, the performance of the filter unit is optimized, which can provide guarantee for the long-term normal operation of the ammonia nitrogen analyzer.

[0024] At the same time, the present application also adds a back-blowing device, which uses high-pressure gas to back-blow and clean the filter unit when the instrument is idle. The instrument sampling process is generally about 8-10 minutes. At this time, the sample water enters the instrument for measurement through the filter unit, three-way valve, and diaphragm pump. In other words, the instrument has at least 50 minutes of idle time without sampling. During this period, an air pump is added to generate high-pressure instrument wind. Through the switching of the three-way valve, the back-blowing gas enters the interior of the filter unit. In the filter unit, the gas is blown out from the inside to the outside, and the dirt attached to the filter unit is blown away from the filter unit, which plays a role of cleaning / cleaning, reducing the number of frequent disassembly and cleaning of the filter unit, and reducing personnel maintenance costs.

[0025] The utility model provides a pretreatment device for filtering sewage entering an ammonia nitrogen analyzer. The utility model includes a filter unit 2 connected to a liquid collector 1 of the ammonia nitrogen analyzer. The water inlet end of the filter unit 2 is connected to a water supply pipeline, and the water supply pipeline is used to provide a water sample to be tested. In order to avoid clogging of a sampling tube, a drain pipe, a sampling joint, and reactor contamination of the ammonia nitrogen analyzer, the filter unit 2 is designed. The water outlet end of the filter unit 2 of the utility model is connected to a three-way valve 4, and the three-way valve 4 is also connected to a liquid inlet pipeline 5 of the liquid collector 1, so that the water medium filtered by the filter unit 2 can enter the liquid inlet pipeline 5 through the three-way valve 4; an anti-blocking unit 3 is provided between the filter unit 2 and the liquid collector 1 of the ammonia nitrogen analyzer, which is used to clean the gap between the filter unit 2 to avoid Due to the reduced filtering efficiency of the filter unit 2, there is still a probability that the water medium entering the liquid inlet pipe 5 will cause the sampling tube of the ammonia nitrogen analyzer to be blocked, the discharge pipe to be blocked, the sampling joint to be blocked, and the reactor to be contaminated. Therefore, the anti-blocking unit 3 disclosed in the present invention includes a backblowing air pump 31 and a backblowing gas delivery pipe 32. One end of the backblowing gas delivery pipe 32 is connected to the backblowing air pump 31 for providing backblowing gas, and the other end is connected to the three-way valve 4. Therefore, the backblowing gas delivery pipe 32 is used to supply backblowing gas to the pipeline between the three-way valve 4 and the filter unit 2. Based on this, the pipeline between the water outlet end of the filter unit 2 and the three-way valve 4 and the filter unit 2 of the present invention will be cleaned under the action of the backblowing gas, which can avoid blockage of this section of the pipeline and the filter unit 2.

[0026] In the present disclosure, as a preferred embodiment, a check valve 6 is provided on the back-blowing gas delivery pipe 32, and the check valve 6 is used to prevent the back-blowing gas in the back-blowing gas delivery pipe 32 from flowing back, prevent the debris blown off by the back-blowing gas from entering the back-blowing air pump 31, and also prevent the water medium entering the liquid inlet pipe 5 from entering the back-blowing air pump 31.

[0027] As another preferred embodiment, the filtration unit 2 is a membrane filtration unit made of PE material, and the filtration gap is less than 5mm, preferably 5um. Through the filtration of the membrane filtration unit, most of the foreign matter that affects the instrument measurement and the clogging of the pretreatment pipeline can be filtered out. When the air pump is backflushing, the foreign matter attached to the filter unit will be blown away from the filter unit. As a more preferred method, it can be discharged through the overflow of on-site water to avoid the accumulation of foreign matter and spoils near the filter unit. That is, by making the purged foreign matter float on the water surface, it can be discharged by overflow or manually cleaned after accumulating to a certain amount. This can reduce the frequency of disassembling the filter unit, and the filtration efficiency of the filter unit can be guaranteed by backflushing, so that the filtered water medium is not prone to clogging after entering the ammonia nitrogen analyzer. For example, if the overflow method is adopted, for example, an overflow port can be designed on the outer shell of the filter unit. When foreign matter needs to be discharged, sufficient water can be passed into the shell. Due to the action of the backflushing gas and the closure of the channel entering the liquid inlet pipe 5 of the ammonia nitrogen analyzer, when the water volume reaches a certain level, the foreign matter can float on the water surface. If the water continues to flow, the foreign matter will overflow to the outside of the shell.

[0028] As an example, a micro diaphragm pump 7 is also included, and the micro diaphragm pump 7 is arranged on the liquid inlet pipe 5 between the three-way valve 4 and the liquid collector 1. The function of the diaphragm pump is to provide power to send the sample processed by the filtration unit into the liquid collection tank. The sample taken by the ammonia nitrogen analyzer is finally extracted from the liquid collection tank.

[0029] As an example, a flow meter is provided on the liquid inlet pipeline 5 .

[0030] As an example, a pressure gauge is also provided on the back-blowing gas delivery pipe 32 to detect the air pressure in the back-blowing gas delivery pipe 32 to determine the blockage condition of the filter unit 2. Of course, the pressure inside the back-blowing air pump can also be detected. If the filter unit 2 is blocked by dirt after a long period of sampling, the back-blowing pressure of the back-blowing air pump 2 will increase. If the pressure gauge reading of the back-blowing air pump 2 exceeds 4 bar, manual cleaning of the filter element of the filter unit 2 can be considered.

[0031] The steps for manual cleaning are as follows:

[0032] (1) Switch the ammonia nitrogen analyzer to manual mode;

[0033] (2) Shut-off valves are installed before and after the filter unit 2, and the filter unit 2 is removed from the pipeline after closing;

[0034] (3) Unscrew the white filter element;

[0035] (4) Clean the filter surface with clean water and a damp soft cloth;

[0036] (5) Soak and clean with cleaning solution. It is generally recommended to soak for 12 hours. The specific time depends on the application conditions and can be increased appropriately.

[0037] (6) After soaking, rinse with clean water, dry and set aside.

[0038] This embodiment also provides an ammonia nitrogen analyzer including the above-mentioned pretreatment device, which can effectively solve the various impacts on the ammonia nitrogen analyzer caused by sewage blocking the filter unit, ensure the normal operation of the ammonia nitrogen analyzer and increase the service life of the ammonia nitrogen analyzer.

[0039] Using the above technical solution of this embodiment, as an example, when arranging the water intake pipeline, the filter unit 2 should be installed near the control box 8, and the pipe length from the filter unit to the control box 8 is recommended not to exceed 4 meters. The closer the control box 8 is to the filter unit, the more effective it is to clean up foreign matter and dirt on the filter unit when the back-blowing air pump is in operation.

[0040] The control box 8 is installed close to the ammonia nitrogen analyzer. The power supply in the control box 8 is provided by the power supply control module in the instrument table, and the short distance can be conveniently installed.

[0041] Use expansion bolts to fix the stainless steel foot support of the control box. The air pump in the control box will vibrate when it is in operation. Using expansion bolts to fix it can prevent the vibration from affecting the normal measurement of other instruments.

[0042] It is recommended that the length of the sample tube from the control box 8 to the instrument liquid collector should not exceed 2.5 meters to avoid a large amount of sample remaining inside the pipe section, which would affect the measurement data.

[0043] The lift of the micro-diaphragm pump 7 in the control box 8 is about 3 meters. Since the length of the sample tube from the control box 8 to the instrument liquid collector is generally not more than 2.5 meters, the sample can be stably provided to the liquid collector.

[0044] In summary, the pretreatment device of the utility model can better avoid the blockage of the filter unit by setting up the anti-blocking unit, can solve the problem of abnormal sampling caused by blockage of the ammonia nitrogen analyzer affecting the normal measurement of the instrument, reduce the loss of the ammonia nitrogen analyzer, and increase its service life.

[0045] In the utility model, a three-way valve is provided so that the back-blowing gas and the sewage conveying pipeline partially overlap, so that the back-blowing gas can not only clean the filter unit, but also can back-blow the pipeline portion between the filter unit and the liquid collector that is closer to the filter unit, thereby avoiding back-blowing the pipeline section between the filter unit and the liquid collector that is more prone to blockage, ensuring that the pipeline between the filter unit and the liquid collector is unobstructed, and ensuring the normal sampling of the ammonia nitrogen analyzer.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pretreatment device for filtering sewage entering an ammonia nitrogen analyzer, comprising a filter unit (2) connected to a liquid collector (1) of the ammonia nitrogen analyzer, wherein the water inlet end of the filter unit (2) is connected to a water supply pipeline, characterized in that: The water outlet pipeline of the filter unit (2) is connected to a three-way valve (4), and the three-way valve (4) is also connected to the liquid inlet pipeline (5) of the liquid collector (1); An anti-blocking unit (3) is provided between the filtering unit (2) and the liquid collector (1) of the ammonia nitrogen analyzer. The anti-blocking unit (3) comprises a back-blowing air pump (31) and a back-blowing gas delivery pipe (32). One end of the back-blowing gas delivery pipe (32) is connected to the back-blowing air pump (31), and the other end is connected to the three-way valve (4).

2. The pretreatment device according to claim 1, characterized in that The back-flushing gas delivery pipe (32) is provided with a check valve (6), and the check valve (6) is used to prevent the back-flushing gas in the back-flushing gas delivery pipe (32) from flowing back.

3. The pretreatment device according to claim 1, characterized in that: The filtration unit (2) is a membrane filtration unit made of PE material, and the filtration gap is no greater than 5 μm.

4. The pretreatment device according to claim 1, characterized in that: It also comprises a micro diaphragm pump (7), which is arranged on the liquid inlet pipeline (5) between the three-way valve (4) and the liquid collector (1).

5. The pretreatment device according to claim 4, characterized in that: The liquid inlet pipeline (5) is provided with a flow meter.

6. The pretreatment device according to claim 1, characterized in that: The backwash gas delivery pipe (32) is also provided with a pressure gauge.

7. The pretreatment device according to claim 4, characterized in that: The anti-blocking unit (3) and the micro-diaphragm pump (7) are both arranged in a control box (8).

8. An ammonia nitrogen analyzer, characterized in that: A pretreatment device comprising any one of claims 1 to 7.

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