CN210322771U - COD on-line measuring system - Google Patents

Abstract

The utility model discloses a COD on-line measuring system, a movable water suction port is connected with a water inlet of a water suction pump through a water suction pipe, a cyclone separator is arranged in the middle of the water suction pipe, a water outlet of the water suction pump is connected with a water inlet of a fine filtering barrel through a pipeline, a water outlet of the fine filtering barrel is communicated with a liquid inlet barrel through a liquid inlet pipe provided with a peristaltic pump, a medicine inlet device is communicated with the liquid inlet barrel through the liquid inlet pipe provided with the peristaltic pump, the liquid inlet barrel is a hollow cylinder with conical sealing heads at two ends, a compressed air inlet pipe with a valve is arranged at the top of the liquid inlet barrel, an outlet communication U-shaped reaction pipe feed inlet with a valve is arranged at the bottom of the liquid inlet barrel, the U-shaped reaction pipe extends out of a heating chamber except a feed end and a discharge end, other parts are soaked in the heating chamber, the discharge end of the U-shaped reaction pipe is communicated with, the water intake part of the system also has certain moving capacity, and the water intake part also has back flushing capacity.

Description

COD on-line measuring system

Technical Field

The utility model relates to a COD on-line monitoring system in the environmental detection equipment indicates a COD on-line measuring system especially.

Background

The COD online monitoring system is an important index for measuring whether the organic content of water exceeds the standard or not at present and is also an important index for measuring whether the water body is polluted or not, and the COD online monitoring system is arranged in a sewage treatment plant, a tap water treatment plant in municipal water supply and an environment monitoring mechanism of an enterprise in a large number.

However, the water intake section of the current COD online monitoring system is single in structure, water pipes and self-sucking pumps are used for sampling water bodies directly, the sampling difficulty of deep water lakes is high, the deep water regions and the sampling difficulty are high, and the following reasons need to be met.

Disclosure of Invention

In order to solve the problem, the utility model provides a COD on-line measuring system, this system have can adjust the superficial latent structure of intake degree of depth, and the water intaking part of this system still has certain mobility, and the water intaking part still has recoil cleaning ability, and this system simple structure does not need computer software and hardware support can work, maintains simply.

In order to achieve the above purpose, the utility model adopts the following technology to realize, a COD online detection system comprises a movable water pumping port, a water intake pump, a water suction pipe, a cyclone separator, a water suction pump, a medicine feeding device, a liquid feeding barrel, a reaction pipe, a heating chamber and a measuring chamber, wherein the movable water pumping port is connected with a water inlet of the water suction pump through the water suction pipe, the cyclone separator is arranged in the middle of the water suction pipe, a water outlet of the water suction pump is connected with a water inlet of a fine filtering barrel through a pipeline, a water outlet of the fine filtering barrel is communicated with the liquid inlet barrel through the liquid inlet pipe provided with the peristaltic pump, the medicine feeding device is communicated with the liquid inlet barrel through the liquid inlet pipe provided with the peristaltic pump, the liquid feeding barrel is a hollow cylinder with conical sealing heads arranged at two ends, a compressed air inlet pipe with a valve is arranged at the top of the liquid inlet barrel, an outlet communicated with a U-shaped reaction pipe with a valve is arranged at, the other parts are soaked in the heating chamber, and the discharge end of the U-shaped reaction tube is communicated with the measuring chamber.

As a further improvement of the utility model, the movable water pumping port consists of a water pumping pipe, a water inlet pump, a three-way valve, a linkage back flushing pipe, a water injection pipe, hanging rings, a counterweight buoyancy tank, a water suction port, a water suction cover, a movable balancing device, a filter screen and a filter cover, the counterweight buoyancy tank is a hemispherical or cylindrical hollow cylinder with an opening at the bottom, the opening at the bottom of the counterweight buoyancy tank is sunken inwards to form a hollow hemispherical water suction cover with an opening at the bottom, the hemispherical opening of the water suction cover is provided with the filter screen, the bottom of the counterweight buoyancy tank is provided with the filter cover covering the opening of the counterweight buoyancy tank, the bottom of the counterweight buoyancy tank is provided with a valve drainage port communicated with a hollow closed space formed by the counterweight buoyancy tank and the water suction cover, the top of the counterweight buoyancy tank is provided with two hanging rings which are symmetrical to each other, the hanging ropes are provided with hanging shore connection ropes fixed at the edge or on the, the water sucking mouth is through absorbing water tub intercommunication cyclone water inlet, counter weight flotation tank top middle zone is provided with the water filling port of intercommunication counter weight flotation tank top internal surface, the water filling port passes through the water injection pipe and is connected with the intake pump delivery port, the drinking-water pipe is installed to the intake pump water inlet, the drinking-water pipe communicates sampling object or counter weight water tank, be provided with compressed air inlet three-way valve on the water injection pipe between water filling port and the intake pump, compressed air inlet three-way valve third pipe connection has the gas distribution pipe, gas distribution pipe intercommunication compressed air gas storage cylinder, be provided with the three-way valve on the water injection pipe between compressed air inlet three-way valve and the intake pump, the third interface of three-way valve is through promoting water inlet pipe and the promotion water inlet pipe connection that the mobile balancing unit established, the top of linkage recoil pipe is installed through couple or fixed metal block to counter weight flotation.

As a further improvement, the dynamic balance device comprises flank, fin, promotion water inlet tube, water distribution house steward, propulsion pipe, and two propulsion pipes are "L" type pipeline, and two propulsion pipes use the fin to install as the mutual symmetry of symmetric center, and the fin is vertical to be installed in counter weight flotation tank top, and flank horizontal installation is in counter weight flotation tank outside middle part, and two propulsion pipes communicate with water distribution house steward for the part of the vertical installation of counter weight flotation tank, and water distribution house steward middle part is provided with the propulsion water inlet.

As a further improvement of the utility model, the linkage recoil pipe is composed of a pressure contraction ball, an annular permanent magnet, a copper ring, a linkage rod, a water inlet, a piston, a recoil pipe fixing ring, a mounting bracket and a recoil pipe, the recoil pipe is a hollow cylinder with a linkage rod mounting hole sealing cover arranged at the top of a bottom opening, the recoil pipe is connected with a cylindrical linkage rod through the linkage rod mounting hole in a penetrating way, the linkage rod is provided with the piston at one end positioned on the recoil pipe, one end of the linkage rod extending out of the recoil pipe is fixedly connected with the bottom end of the pressure contraction ball, the top end of the pressure contraction ball is fixed on the inner surface of the top of the counterweight buoyancy tank through a hook or a fixed metal block, the opening end of the recoil pipe extends to the area between the filter mantle and the filter screen covered by the filter mantle, the middle part of the recoil pipe is provided with the annular recoil pipe fixing ring, the recoil pipe, the top of the back flushing pipe is provided with a circle of annular permanent magnet surrounding the linkage rod, the middle lower part of the linkage rod is provided with a copper ring which is arranged on the linkage rod through a joint material, the copper ring is vertically arranged relative to the linkage rod, the pressure contraction ball is a hollow rubber ball, and the pressure of the hollow ball is normal pressure.

As a further improvement of the utility model, it comprises distilled water tank, heavy complex acid salt case, sulphuric acid-silver sulfate case, reserve medical kit, feed liquor pipe, peristaltic pump to advance the medicine device, wherein the peristaltic pump comprises No. two pumps, No. three pumps, No. four pumps, No. five pumps, distilled water tank is through the feed liquor pipe and the feed liquor bucket upper portion intercommunication of having installed No. two pumps, heavy complex acid salt case is through the feed liquor pipe and the feed liquor bucket upper portion intercommunication of having installed No. three pumps, sulphuric acid-silver sulfate case is through the feed liquor pipe and the feed liquor bucket upper portion intercommunication of having installed No. five pumps, reserve medical kit is through the feed liquor pipe and the feed liquor bucket upper portion intercommunication of having installed No. four pumps.

As a further improvement of the utility model, the heating chamber comprises constant temperature reaction box, heating oil, heating wire, pressure safety valve, and constant temperature reaction box is the box of sealed cavity metallic structure area lagging casing, and constant temperature reaction box top is provided with pressure safety valve and takes each one of the vent pipe of valve, has put in the constant temperature reaction box and accounts for box 40-70% heating oil, and the lower part is provided with the heating wire in the constant temperature reaction box, and "U" type reaction tube middle part horizontal pipeline soaks completely in the heating oil.

As the utility model discloses a further improvement, the measuring chamber comprises liquid sending pipe, spectrophotometer, and the liquid sending pipe is the cavity tubular metal resonator, liquid sending pipe inlet intercommunication reaction tube's liquid outlet, liquid sending pipe liquid outlet intercommunication spectrophotometer sample cell.

The working principle is as follows: the effect of copper ring and annular permanent magnet produces a cutting magnetic induction line action at the in-process that the copper ring falls to let the copper ring whereabouts slow down, let have a time difference between water inlet and the piston, can have more backwash water to be used for the recoil washing filter mantle.

Compared with the prior art, the utility model following beneficial effect has:

1. the system has a floating and diving structure capable of adjusting the depth of a water intake, the water intake part of the system also has certain moving capacity, the water intake part also has back flushing capacity, the system has a simple structure, can work without the support of computer software and hardware, and is simple to maintain.

Drawings

FIG. 1 is a schematic view of the installation of a COD on-line detection system;

FIG. 2 is a schematic structural view of a movable water pumping port of the COD online detection system;

FIG. 3 is an outer sectional view of a structural schematic diagram of a counterweight buoyancy tank arranged in the COD online detection system;

FIG. 4 is a schematic view of a linkage back flushing pipe of the COD on-line detection system;

FIG. 5 is a schematic top view of a counterweight buoyancy tank of the COD online detection system;

FIG. 6 is a schematic structural view of a chemical feeding device of the COD online detection system;

1-hanging a connecting rope; 2, a water pumping pipe; 3-a water inlet pump; 4-a suction pipe; 5-a cyclone separator; 6-water pump; 7-fine filtering cylinder; 8-a distilled water tank; 9-heavy complex acid salt box; 10-a liquid inlet pipe; 11-a liquid inlet barrel; 12-pressure safety valve; 13-a reaction tube; 14-a measurement chamber; 15-compressed air inlet pipe; 16-heating oil; 17-constant temperature reaction box; 18-electric heating wire; 19-a peristaltic pump; 20-standby medicine chest; 21-sulfuric acid-silver sulfate box; 22-movable water pumping port; 23-a three-way valve; 24-pushing a water inlet pipe; 25-hanging ring; 26-a water suction port; 27-a filter screen; 28-propulsion water inlet; 29-a water absorbing cover; 30-a filter mantle; 31-a water outlet; 32-a counterweight buoyancy tank; 33-water injection port; 34-a water injection pipe; 36-compressed air intake three-way valve; 37-linkage recoil pipe; 38-back flushing pipe; 39-pressure shrink ball; 40-ring permanent magnet; 41-water inlet; 42-a recoil pipe fixing ring; 43-a piston; 44-a mounting bracket; 45-linkage bar; 46-a copper ring; 47-flank; 48-a propulsion tube; 49-water distribution main; 50-tail wing; 51-a liquid delivery pipe; 52-a filter layer; 53-pump number one; 54-pump number two; 55-pump number three; 56-pump number four; 57-five pump; 58-sewage draining outlet.

Detailed Description

Example 1

As shown in fig. 1 to 6, a COD on-line detecting system comprises a movable water pumping port 22, a water intake pump 3, a water suction pipe 4, a cyclone separator 5, a water suction pump 6, a medicine inlet device, a liquid inlet barrel 11, a reaction pipe 13, a heating chamber, and a measuring chamber 14, wherein the movable water pumping port 22 is connected with a water inlet of the water suction pump 6 through the water suction pipe 4, the cyclone separator 5 is installed in the middle of the water suction pipe 4, a water outlet of the water suction pump 6 is connected with a water inlet of a fine filtration barrel 7 through a pipeline, a water outlet of the fine filtration barrel 7 is communicated with the liquid inlet barrel 11 through a liquid inlet pipe 10 provided with a peristaltic pump 19, the medicine inlet device is communicated with the liquid inlet barrel 11 through a liquid inlet pipe 10 provided with a peristaltic pump 19, the liquid inlet barrel 11 is a hollow cylinder with conical heads at two ends, a compressed air inlet pipe 15 with a valve is arranged at the top of the liquid inlet barrel 11, an outlet, the U-shaped reaction tube 13 extends out of the heating chamber except the feeding end and the discharging end, other parts are soaked in the heating chamber, the discharging end of the U-shaped reaction tube 13 is communicated with the measuring chamber 14, the movable water pumping port consists of a water pumping tube 2, a water inlet pump 3, a three-way valve 23, a linkage back flushing tube 37, a water injection tube 34, a hanging ring 25, a counterweight buoyancy tank 32, a water suction port 26, a water suction cover 29, a movable balancing device, a filter screen 27 and a filter cover 30, the counterweight buoyancy tank 32 is a hemispherical or cylindrical hollow cylinder with an opening at the bottom, the opening at the bottom of the counterweight buoyancy tank 32 is inwards sunken to form a hollow hemispherical water suction cover 29 with an opening at the bottom, the filter screen 27 is arranged at the hemispherical opening of the water suction cover 29, the filter cover 30 for covering the opening of the counterweight buoyancy tank 32 is arranged at the bottom of the counterweight buoyancy tank 32, a water outlet 31 with a valve for communicating a hollow closed space consisting of the, the top of the counterweight buoyancy tank 32 is provided with two symmetrical hanging rings 25, hanging ropes 1 are arranged on the hanging rings 25, the hanging ropes 1 are fixed on the shore or the ship, the convex top of the water suction cover 29 is provided with a water suction port 26 extending to the inner surface of the water suction cover 29, the water suction port 26 is communicated with the water inlet of the cyclone separator 5 through a water suction pipe 4, the middle area of the top of the counterweight buoyancy tank 32 is provided with a water filling port 33 communicated with the inner surface of the top of the counterweight buoyancy tank 32, the water filling port 33 is connected with the water outlet of the water inlet pump 3 through a water filling pipe 34, the water inlet of the water inlet pump 3 is provided with a water pumping pipe 2, the water pumping pipe 2 is communicated with a sampling object or a counterweight water tank, a compressed air inlet three-way valve 36 is arranged on the water filling pipe 34 between the water filling port 33 and the water inlet pump 3, a third pipeline of the compressed air inlet three-way valve 36 is connected with, the third interface of the three-way valve 23 is connected with a pushing water inlet pipe 24 arranged on a mobile balancing device through the pushing water inlet pipe 24, the top of a linkage back flushing pipe 37 is arranged on the inner surface of the top of the counterweight floating box 32 through a hook or a fixed metal block, the bottom of the linkage back flushing pipe 37 is communicated with the inside of the filter cover 30, the dynamic balancing device is composed of a side wing 47, a tail wing 50, a pushing water inlet pipe 24, a water distribution main pipe 49 and a pushing pipe 48, the two pushing pipes 48 are L-shaped pipelines, the two pushing pipes 48 are symmetrically arranged with the tail wing 50 as a symmetric center, the tail wing 50 is vertically arranged on the top of the counterweight floating box 32, the side wing 47 is horizontally arranged in the middle of the outer side of the counterweight floating box 32, the part of the two pushing pipes 48 vertically arranged relative to the counterweight floating box 32 is communicated with the water distribution main pipe 49, a pushing water inlet 28, The device comprises an annular permanent magnet 40, a copper ring 46, a linkage rod 45, a water inlet 41, a piston 43, a recoil pipe fixing ring 42, a mounting bracket 44 and a recoil pipe 38, wherein the recoil pipe 38 is a hollow cylinder with a linkage rod mounting hole sealing cover arranged at the top of an opening at the bottom, the cylindrical linkage rod 45 is connected to the recoil pipe 38 in a penetrating way through the linkage rod mounting hole, the piston 43 is arranged at one end of the linkage rod 45 positioned at the recoil pipe 38, one end of the linkage rod 45 extending out of the recoil pipe 38 is fixedly connected to the bottom end of a pressure contraction ball 39, the top end of the pressure contraction ball 39 is fixed to the inner surface of the top of a counterweight buoyancy tank 32 through a hook or a fixed metal block, the opening end of the recoil pipe 38 extends to the area between a filter cover 30 and a filter screen 27 which are coated by the filter cover 30, the annular recoil pipe fixing ring 42 is arranged in the middle of the recoil pipe 38, the recoil pipe, the top of the backflushing pipe 38 is provided with a ring of annular permanent magnets 40 surrounding a linkage rod 45, the middle lower part of the linkage rod 45 is provided with a copper ring 46 which is arranged on the linkage rod 45 through a joint material, the copper ring 46 is vertically arranged relative to the linkage rod 45, a pressure contraction ball 39 is a hollow rubber ball, the pressure of the hollow ball is normal pressure, the medicine feeding device comprises a distilled water tank 8, a heavy complex acid salt tank 9, a sulfuric acid-silver sulfate tank 21, a spare medicine box 20, a liquid inlet pipe 10 and a peristaltic pump 19, wherein the peristaltic pump 19 comprises a second pump 54, a third pump 55, a fourth pump 56 and a fifth pump 57, the distilled water tank 8 is communicated with the upper part of the liquid inlet barrel 11 through the liquid inlet pipe 10 provided with the second pump 54, the heavy complex acid salt tank 9 is communicated with the upper part of the liquid inlet barrel 11 through the liquid inlet pipe 10 provided with the third pump 55, the sulfuric acid-silver sulfate tank 21 is communicated with the upper part of the liquid inlet barrel 11 through the, the spare medicine box 20 is communicated with the upper part of a liquid inlet barrel 11 through a liquid inlet pipe 10 provided with a fourth pump 56, the heating chamber is composed of a constant temperature reaction box 17, heating oil 16, an electric heating wire 18 and a pressure safety valve 12, the constant temperature reaction box 17 is a sealed hollow metal structure box body with a heat insulation shell, the top of the constant temperature reaction box 17 is provided with the pressure safety valve 12 and an air duct with a valve, the constant temperature reaction box 17 is internally provided with the heating oil 16 accounting for 40-70% of the box body, the middle lower part in the constant temperature reaction box 17 is provided with the electric heating wire 18, a horizontal duct in the middle of a U-shaped reaction pipe 13 is completely soaked in the heating oil 16, the measuring chamber 14 is composed of a liquid feeding pipe and a spectrophotometer, the liquid feeding pipe is a hollow metal pipe, the liquid feeding pipe liquid inlet is communicated with the liquid outlet of the reaction.

Claims (7)

1. The utility model provides a COD on-line measuring system, includes portable mouth (22), intake pump (3), absorbs water tub (4), cyclone (5), suction pump (6), advances the medicine device, advances liquid bucket (11), reaction tube (13), heating chamber, measuring chamber (14), its characterized in that: the movable water pumping port (22) is connected with a water inlet of a water pump (6) through a water suction pipe (4), a cyclone separator (5) is arranged in the middle of the water suction pipe (4), a water outlet of the water pump (6) is connected with a water inlet of a fine filter barrel (7) through a pipeline, a water outlet of the fine filter barrel (7) is communicated with a liquid inlet barrel (11) through a liquid inlet pipe (10) provided with a peristaltic pump (19), a medicine inlet device is communicated with the liquid inlet barrel (11) through the liquid inlet pipe (10) provided with the peristaltic pump (19), the liquid inlet barrel (11) is a hollow cylinder with conical seal heads at two ends, a compressed air inlet pipe (15) with a valve is arranged at the top of the liquid inlet barrel (11), an outlet with a valve is arranged at the bottom of the liquid inlet barrel (11) and communicated with a feed inlet of a U-shaped reaction pipe (13), the U-shaped reaction pipe (13) extends out of a heating chamber except for a feed, the discharge end of the U-shaped reaction tube (13) is communicated with a measuring chamber (14).

2. The COD online detection system of claim 1, wherein: the movable water pumping port consists of a water pumping pipe (2), a water inlet pump (3), a three-way valve (23), a linkage back flushing pipe (37), a water injection pipe (34), hanging rings (25), a counterweight buoyancy tank (32), a water suction port (26), a water suction cover (29), a movable balancing device, a filter screen (27) and a filter cover (30), wherein the counterweight buoyancy tank (32) is a hemispherical or cylindrical hollow cylinder with an opening at the bottom, the opening at the bottom of the counterweight buoyancy tank (32) is inwards sunken to form the hollow hemispherical water suction cover (29) with an opening at the bottom, the filter screen (27) is arranged at the hemispherical opening of the water suction cover (29), the filter cover (30) covering the opening of the counterweight buoyancy tank (32) is arranged at the bottom of the counterweight buoyancy tank (32), a drainage outlet (31) communicated with a hollow closed space consisting of the counterweight buoyancy tank (32) and the water suction cover (29) is arranged at the bottom of the counterweight buoyancy tank (32), the two hanging rings (25) which, the hanging ring (25) is provided with a hanging rope (1), the hanging rope (1) is fixed on the shore or the ship, the top of the bulge of the water suction cover (29) is provided with a water suction port (26) extending to the inner surface of the water suction cover (29), the water suction port (26) is communicated with the water inlet of the cyclone separator (5) through a water suction pipe (4), the middle area of the top of the counterweight buoyancy tank (32) is provided with a water filling port (33) communicated with the inner surface of the top of the counterweight buoyancy tank (32), the water filling port (33) is connected with the water outlet of the water inlet pump (3) through a water filling pipe (34), the water inlet of the water inlet pump (3) is provided with a water pumping pipe (2), the water pumping pipe (2) is communicated with a sampling object or a counterweight water tank, a compressed air inlet three-way valve (36) is arranged on the water filling pipe (34) between the water filling port (33) and, the air distribution pipe communicates with the compressed air storage cylinder, a three-way valve (23) is arranged on a water injection pipe (34) between a compressed air inlet three-way valve (36) and the water inlet pump (3), a third interface of the three-way valve (23) is connected with a pushing water inlet pipe (24) arranged on the mobile balancing device through a pushing water inlet pipe (24), the inner surface of the top of the counterweight buoyancy tank (32) is provided with the top of a linkage recoil pipe (37) through a hook or a fixed metal block, and the bottom of the linkage recoil pipe (37) is communicated with the inside of the filter cover (30).

3. The COD online detection system of claim 2, wherein: dynamic balance device is by flank (47), fin (50), promote water inlet pipe (24), water distribution house steward (49), impel pipe (48) to constitute, two impel pipe (48) are "L" type pipeline, two impel pipe (48) use fin (50) to install as symmetry center mutual symmetry, fin (50) are vertical to be installed at counter weight flotation tank (32) top, flank (47) horizontal installation in counter weight flotation tank (32) outside middle part, two impel pipe (48) for the part of counter weight flotation tank (32) vertical installation with water distribution house steward (49) intercommunication, water distribution house steward (49) middle part is provided with impels water inlet (28).

4. The COD online detection system of claim 2, wherein: the linkage recoil pipe (37) consists of a pressure contraction ball (39), an annular permanent magnet (40), a copper ring (46), a linkage rod (45), a water inlet (41), a piston (43), a recoil pipe fixing ring (42), a mounting bracket (44) and a recoil pipe (38), the recoil pipe (38) is a hollow cylinder with a linkage rod mounting hole sealing cover arranged at the top of an opening at the bottom, the cylindrical linkage rod (45) is connected with the recoil pipe (38) in a penetrating way through the linkage rod mounting hole, the piston (43) is arranged at one end of the linkage rod (45) positioned on the recoil pipe (38), one end of the linkage rod (45) extending out of the recoil pipe (38) is fixedly connected to the bottom end of the pressure contraction ball (39), the top end of the pressure contraction ball (39) is fixed on the inner surface at the top of the counterweight floating box (32) through a hook or a fixed metal block, the open end of the recoil pipe (38) extends to a region between the filter mantle (30) and the filter screen (27) covered, the middle of the recoil pipe (38) is provided with a circular recoil pipe fixing ring (42), the recoil pipe fixing ring (42) is fixed on a mounting bracket (44) arranged in the counterweight buoyancy tank (32) through bolts, the top of the recoil pipe (38) is provided with a ring of annular permanent magnet (40) around the linkage rod (45), the middle lower part of the linkage rod (45) is provided with a copper ring (46) arranged on the linkage rod (45) through a joint material, the copper ring (46) is vertically arranged relative to the linkage rod (45), the pressure shrinkage ball (39) is a hollow rubber ball, and the pressure of the hollow ball is normal pressure.

5. The COD online detection system of claim 1, wherein: the medicine feeding device is composed of a distilled water tank (8), a heavy complex acid salt tank (9), a sulfuric acid-silver sulfate tank (21), a standby medicine box (20), a liquid inlet pipe (10) and a peristaltic pump (19), wherein the peristaltic pump (19) is composed of a second pump (54), a third pump (55), a fourth pump (56) and a fifth pump (57), the distilled water tank (8) is communicated with the upper part of the liquid inlet barrel (11) through the liquid inlet pipe (10) provided with the second pump (54), the heavy complex acid salt tank (9) is communicated with the upper part of the liquid inlet barrel (11) through the liquid inlet pipe (10) provided with the third pump (55), the sulfuric acid-silver sulfate tank (21) is communicated with the upper part of the liquid inlet barrel (11) through the liquid inlet pipe (10) provided with the fifth pump (57), and the standby medicine box (20) is communicated with the upper part of the liquid inlet barrel (11) through the liquid inlet pipe (10) provided with the fourth pump (56).

6. The COD online detection system of claim 1, wherein: the heating chamber is composed of a constant temperature reaction box (17), heating oil (16), electric heating wires (18) and a pressure safety valve (12), the constant temperature reaction box (17) is a sealed hollow metal structure box body with a heat preservation shell, the top of the constant temperature reaction box (17) is provided with the pressure safety valve (12) and an air duct with a valve, the heating oil (16) accounting for 40-70% of the box body is stored in the constant temperature reaction box (17), the electric heating wires (18) are arranged at the middle lower part in the constant temperature reaction box (17), and a horizontal pipeline at the middle part of the U-shaped reaction tube (13) is completely soaked in the heating oil (16).

7. The COD online detection system of claim 1, wherein: the measuring chamber (14) is composed of a liquid feeding pipe and a spectrophotometer, the liquid feeding pipe is a hollow metal pipe, a liquid inlet of the liquid feeding pipe is communicated with a liquid outlet of the reaction pipe (13), and a liquid outlet of the liquid feeding pipe is communicated with a sample tube of the spectrophotometer.

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