CN107727435A - Total organic carbon on-line checking sampler - Google Patents

Abstract

The invention relates to the technical field of detection of total organic carbon content in boiler feed water of a thermal power plant. There is a filter device with intervals, the filter device separates the sampling barrel into an upper barrel body and a lower barrel body which are not communicated with each other, a first liquid inlet is arranged at the lower end of the filter device, and a second liquid inlet is arranged on the lower barrel body. The invention has a reasonable and compact structure and is easy to use; the filter device can filter out particles with a diameter of more than 5 μm, which can prevent the fine particles in the water sample from clogging the internal pipeline of the instrument, but will not filter out the organic matter in the sample; the drain pipe adopts high-pass sampling The U-shaped tube on the top of the barrel ensures that the circulation device is full of water and does not produce siphon phenomenon; it can ensure that there is no air inside the circulation device, eliminating the influence of carbon dioxide dissolved in the sample on the test results. The sampling barrel and cover are installed with threads, which is convenient Replace filter unit.

Description

Total organic carbon online detection sampling device

technical field

The invention relates to the technical field of total organic carbon content detection in boiler feed water of a thermal power plant, and is an online detection and sampling device for total organic carbon.

Background technique

The pressure parameters of boilers in thermal power plants are high, and the requirements for water quality are strict. When the total organic carbon enters the thermal system of the boiler, it will decompose and generate organic acid, which will cause corrosion to the thermal system. In order to reduce the risk of corrosion caused by organic acids in the boiler thermal system, it is necessary to detect the total organic carbon content in the feed water. In related technologies, the online measurement of total organic carbon in feed water is carried out by storing a certain volume of feed water samples in sampling bottles and connecting them with the sampling needles of detection instruments, and using detection instruments for measurement. However, due to the small impurity particles in the feed water sample, there is a risk of blocking the detection instrument; in addition, the connection between the sampling bottle and the sampling needle is not tightly sealed, and carbon dioxide in the air is mixed into the sample, which may easily cause its pollution and deterioration, resulting in inaccurate final test results; Frequent manual replacement of sampling bottles increases work intensity.

Contents of the invention

The invention provides an on-line detection and sampling device for total organic carbon, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the feed water sample contains fine impurity particles and there is a risk of clogging the detection instrument.

The present invention further solves the problem that the joint between the sampling bottle and the sampling needle is not tightly sealed, and carbon dioxide in the air is easily mixed into the sample to cause pollution and deterioration, resulting in inaccurate final detection results.

The technical solution of the present invention is achieved through the following measures: a total organic carbon online detection sampling device, including a sampling barrel, a filter device and a drain pipe, and a filter device with a distance from the bottom of the sampling barrel is fixedly installed in the sampling barrel , the filter device separates the sampling barrel into an upper barrel body and a lower barrel body that do not communicate with each other, a first liquid inlet is provided at the lower end of the filter device, a second liquid inlet is provided on the lower barrel body, and a second liquid inlet is provided at the second liquid inlet An online sample connection device is fixedly installed on the mouth, and a gland is fixed and sealed on the upper end of the upper barrel body. An axial channel is arranged in the middle of the gland, and a drain pipe is fixed and sealed in the axial channel. The instrument connection device is fixedly installed on the drain pipe.

Below is the further optimization or/and improvement to above-mentioned technical scheme of the invention:

The above-mentioned online sample connection device is a polytetrafluoroethylene tube with a tightened nut, and the instrument connection device is a polytetrafluoroethylene tube with a tightened nut.

The above-mentioned discharge pipe includes a lower vertical pipe, an upper vertical pipe, a horizontal pipe and a U-shaped pipe. The lower vertical pipe is fixed and sealed in the axial channel, and the upper vertical pipe is fixedly mounted on the lower vertical pipe above the gland by threads. Vertical tube, one end of the horizontal tube is integrally fixed and communicated with the upper end of the upper vertical tube, the other end of the horizontal tube is fixed and communicated with one end of the U-shaped tube, and one side of the upper vertical tube is integrally fixed and communicated with an instrument connection The device connecting pipe is fixedly installed with the instrument connecting device on the connecting pipe of the instrument connecting device.

The above-mentioned filter device is a polyamide wound filter cotton with a filtration precision of 5 μm.

The bottom of the sampling barrel is clamped with a truncated cone-shaped base.

The above-mentioned sampling barrel is a stainless steel sampling barrel.

The invention has a reasonable and compact structure and is easy to use; the filter device can filter out particles with a diameter of more than 5 μm, which can prevent the fine particles in the water sample from clogging the internal pipeline of the instrument, but will not filter out the organic matter in the sample; The U-shaped tube on the top of the bucket ensures that the circulation device is full of water and does not produce siphon phenomenon; it can ensure that there is no air inside the circulation device, eliminating the influence of carbon dioxide dissolved in the sample on the test results. The sampling bucket and cover are installed with threads, which is convenient Replace filter unit.

Description of drawings

Accompanying drawing 1 is the partial sectional structural schematic diagram of front view when there is no base of the best embodiment of the present invention.

Accompanying drawing 2 is the schematic diagram of the front view structure of the base of the best embodiment of the present invention.

The codes in the drawings are: 1 is the filter device, 2 is the upper barrel body, 3 is the lower barrel body, 4 is the first liquid inlet, 5 is the second liquid inlet, 6 is the online sample connection device, 7 is the Gland, 8 is an instrument connecting device, 9 is a lower vertical pipe, 10 is an upper vertical pipe, 11 is a horizontal pipe, 12 is a U-shaped pipe, 13 is an instrument connecting device connecting pipe, and 14 is a base.

detailed description

The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of the accompanying drawing 1 of the specification. Figure 1 layout direction to determine.

Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

As shown in accompanying drawing 1, this total organic carbon on-line detection sampling device comprises a sampling barrel, a filter device 1 and a drain pipe, and a filter device 1 with a distance from the bottom of the sampling barrel is fixedly installed in the sampling barrel, and the filter device 1 will sample The bucket is divided into an upper barrel body 2 and a lower barrel body 3 which do not communicate with each other. A first liquid inlet 4 is provided at the lower end of the filter device 1, a second liquid inlet 5 is provided on the lower barrel body 3, and a second liquid inlet 5 is arranged at the second inlet. An online sample connection device 6 is fixedly installed on the liquid port 5, a gland 7 is fixedly sealed and installed on the upper end of the upper barrel body 2, and an axial channel is arranged in the middle of the gland 7, and a drain is fixed and sealed in the axial channel. The liquid pipe is fixedly equipped with an instrument connection device 8 on the liquid discharge pipe above the gland 7 .

According to actual needs, the above-mentioned total organic carbon online detection and sampling device can be further optimized or/and improved:

As shown in Figure 1 , the online sample connecting device 6 is a polytetrafluoroethylene tube with a screwed-on nut, and the instrument connecting device 8 is a polytetrafluoroethylene tube with a screwed-on nut. This facilitates attachment and removal.

As shown in Figure 1, the discharge pipe includes a lower vertical pipe 9, an upper vertical pipe 10, a horizontal pipe 11 and a U-shaped pipe 12, and the lower vertical pipe 9 is fixed and sealed in the axial passage, above the gland 7 The upper vertical pipe 10 is fixedly installed by screw thread on the lower vertical pipe 9, one end of the horizontal pipe 11 is integrally fixed and communicated with the upper end of the upper vertical pipe 10, and the other end of the horizontal pipe 11 is fixed with one end of the U-shaped pipe 12. And connected, one side of the upper vertical pipe 10 is integrally fixed and communicated with an instrument connection device connection pipe 13, and an instrument connection device 8 is fixedly installed on the instrument connection device connection pipe 13. The arrangement of the U-shaped tube 12 can ensure that there is no air inside the circulation device, and eliminate the influence of carbon dioxide dissolved into the sample on the test result.

The filter device 1 is a polyamide wound filter cotton with a filtration precision of 5 μm as required. The filter device can filter out particles above 5 μm, and at the same time, organic matter can enter the testing instrument through the filter element, ensuring that the internal pipeline of the testing instrument is not blocked;

In order to increase the stability, the bottom of the sampling bucket is clamped with a truncated cone-shaped base 14 .

According to requirements, the sampling barrel is a stainless steel sampling barrel, and the upper end of the upper barrel body 2 is fixed and sealed with a gland 7 by threads.

The equipment adopted in the present invention is small in size, can be disassembled and assembled on site, and is convenient for transportation; the filter device can filter out particles with a diameter of more than 5 μm, which can prevent the fine particles in the water sample from clogging the internal pipeline of the instrument, but will not filter out organic matter in the sample The discharge pipe adopts the U-shaped pipe 12 higher than the top of the sampling barrel to ensure that the flow device is full of water and will not produce a siphon phenomenon; it can ensure that there is no air inside the flow device, eliminating the influence of carbon dioxide dissolved in the sample on the test results. Bucket and closure are threaded for easy filter replacement.

The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (10)

1. A total organic carbon on-line detection sampling device is characterized in that it comprises a sampling barrel, a filtering device and a drain pipe, and a filtering device with a distance from the bottom of the sampling barrel is fixedly installed in the sampling barrel, and the filtering device separates the sampling barrel into The upper barrel and the lower barrel that are not connected to each other have a first liquid inlet at the lower end of the filter device, a second liquid inlet on the lower barrel, and an online sample connection device fixedly installed on the second liquid inlet , a gland is fixedly sealed on the upper end of the upper barrel, an axial channel is arranged in the middle of the gland, a drain pipe is fixedly sealed in the axial channel, and a drain pipe is fixedly installed on the drain pipe above the gland. Instrument connection device. 2. The on-line detection and sampling device for total organic carbon according to claim 1, characterized in that the on-line sample connection device is a polytetrafluoroethylene tube with a tightened nut, and the instrument connection device is a polytetrafluoroethylene tube with a tightened nut. Vinyl pipe. 3. The online detection and sampling device for total organic carbon according to claim 1 or 2, wherein the discharge pipe comprises a lower vertical pipe, an upper vertical pipe, a horizontal pipe and a U-shaped pipe, and the lower vertical pipe is fixed and sealed in the In the axial channel, the upper vertical pipe is fixedly installed on the lower vertical pipe above the gland by screw thread, one end of the horizontal pipe is integrally fixed and communicated with the upper end of the upper vertical pipe, and the other end of the horizontal pipe is connected with the U-shaped pipe. One end of the upper vertical pipe is fixed and communicated, and one side of the upper vertical pipe is integrally fixed and communicated with an instrument connecting device connecting pipe, and an instrument connecting device is fixedly installed on the connecting pipe of the instrument connecting device. 4. The online detection and sampling device for total organic carbon according to claim 1 or 2, characterized in that the filter device is a polyamide wound filter cotton with a filtration precision of 5 μm. 5. The sampling device for online detection of total organic carbon according to claim 3, characterized in that the filter device is a polyamide wound filter cotton with a filtration precision of 5 μm. 6. The sampling device for online detection of total organic carbon according to claim 1, 2 or 5, characterized in that a truncated cone-shaped base is clamped at the bottom of the sampling barrel. 7. The sampling device for online detection of total organic carbon according to claim 3, characterized in that the bottom of the sampling barrel is clamped with a truncated cone-shaped base. 8. The sampling device for online detection of total organic carbon according to claim 4, characterized in that the bottom of the sampling barrel is clamped with a truncated cone-shaped base. 9. According to claim 1 or 2 or 5 or 7 or 8 described total organic carbon online detection sampling device, it is characterized in that the sampling barrel is a stainless steel sampling barrel, or/and, the upper end of the upper barrel body is fixed and sealed by threads Gland. 10. The sampling device for online detection of total organic carbon according to claim 6, characterized in that the sampling barrel is a stainless steel sampling barrel, or/and, the upper end of the upper barrel body is fixed and sealed with a gland by threads.