CN217688093U - A prevent suck-back filtration integrated device for mercury sampling in boiler flue gas - Google Patents

Abstract

The utility model discloses an integrated device for anti-suckback filtering for mercury sampling in boiler flue gas, comprising a sampling pump, an absorption bottle group, an anti-suckback filter and a sampling gun. One end of the sampling gun can extend into a boiler flue. , the other end of the sampling gun is connected with the anti-suckback filter, and then connected to the absorption bottle group and the sampling pump in turn. The anti-suckback filter includes a filter and an anti-suction pipe. Movable glass float. The utility model uses the glass float ball to block the top opening of the inner pipe of the air outlet pipe or to leave the top opening of the inner pipe of the air outlet pipe, so as to achieve the purpose of controlling the opening and closing of the flue, and can effectively prevent the back suction of the sampling flue gas and the absorbing liquid. The filter can effectively filter the fine particle dust in the flue gas and prevent the pollution from clogging the device. By setting the electric heat tracing insulation device, the adsorption of mercury in the flue gas can be effectively reduced. The test accuracy rate is high, easy to operate and easy to install. Mercury detection field has strong practicability.

Description

An integrated anti-suckback filtering device for mercury sampling in boiler flue gas

technical field

The utility model belongs to the technical field of flue gas treatment, in particular to an integrated anti-suckback filtering device used for mercury sampling in boiler flue gas.

Background technique

Flue gas emissions from coal-fired power plants are one of the main sources of mercury pollution in my country. Mercury is one of the trace heavy metal elements in coal. Because mercury is highly volatile, it is easy to be discharged into the atmosphere with flue gas after combustion, causing environmental pollution. Therefore, the mercury content in coal has attracted the attention of many researchers at home and abroad. In order to reduce the emission of mercury in coal-fired flue gas, there are currently commercial mercury removal catalysts or the use of absorbent mercury removal or flue gas co-removal of mercury to remove mercury from flue gas. In order to detect the mercury removal effect, the online sampling analysis of the mercury content in the flue gas is particularly important.

In the field mercury sampling process, the Ontario method is more commonly used. This method uses multiple absorption bottle groups for wet chemical absorption sampling, but there are still some outstanding problems in practical application. For example, the general sampling time should not be less than 2 hours. During the sampling period, it is necessary to ensure that the sampling flow rate is stable. During the sampling period, there is usually a backflow of sample gas due to excessive negative pressure in the sampling area, which leads to the termination of sampling. It is necessary to re-prepare the absorption solution before proceeding sampling. At the same time, the flue gas sampling gun is generally equipped with a coarse filter at the tip of the gun, but the fine particle dust contained in the flue gas cannot be effectively filtered, so as the flue gas adheres to the inner wall of the pipe or the absorption bottle, the passage of the sampling system is blocked , or even erode various components, which not only affects the analysis of normal sampling flue gas components, but also affects the service life of the sampling gun. Therefore, in order to solve the phenomenon of negative pressure suck back and smoke clogging in the field sampling process, it is urgent to design a compact and easy-to-install anti-suck back filter integrated device.

Utility model content

In order to solve the technical problems existing in the prior art, the purpose of this utility model is to provide an integrated anti-suckback filtering device for mercury sampling in boiler flue gas, which has the functions of preventing sampling flue gas and absorbing liquid from sucking back and high precision Filter function, high test accuracy, easy to operate, easy to install, and has strong practicability in the field of mercury detection in boiler flue gas.

In order to achieve the above-mentioned purpose and achieve the above-mentioned technical effect, the technical solution adopted in the utility model is:

An integrated anti-suckback filtering device for mercury sampling in boiler flue gas, including a sampling pump, an absorption bottle set, an anti-suckback filter and a sampling gun, one end of the sampling gun can be extended into the boiler flue, and the sampling The other end of the gun is connected to the anti-suckback filter and then connected to the absorption bottle set and the sampling pump in turn. The anti-suckback filter includes a filter and an anti-suckback pipe arranged between the absorption bottle set and the filter. The filter is provided with The filter element is provided with a movable glass floating ball inside the anti-falling suction tube.

Further, the top of the filter is provided with an anti-suckback pipe, and the bottom of the filter is connected to a sampling gun through an air intake pipe.

Further, the anti-backward suction pipe includes an outer pipe of the outlet pipe and an inner pipe of the outlet pipe coaxially arranged from outside to inside, the bottom opening of the inner pipe of the outlet pipe communicates with the inside of the filter, and the top opening of the inner pipe of the outlet pipe is arranged on the outlet pipe In the outer pipe, a glass float is arranged at the top opening of the outlet pipe inner pipe, the inner diameter of the outer pipe of the outlet pipe is greater than the diameter of the glass float, and the inner diameter of the outlet pipe inner pipe is the same as the diameter of the glass float.

Further, the inner top of the outer pipe of the air outlet pipe is provided with a floating ball limiter for limiting the position of the glass floating ball. The top opening of the inner tube leaves.

Further, the floating ball limiting frame includes a corrosion-resistant rubber ring and a cross disposed therein.

Further, a filter element support frame is arranged inside the filter, and a filter element is placed on the filter element support frame, and the filter element includes multiple layers of fiber paper.

Further, the support frame of the filter element is in a Pozieri-shaped structure.

Further, the anti-suckback pipe and filter are equipped with electric heat tracing and heat preservation devices to ensure that the temperatures inside the anti-suckback pipe and filter are both above 130°C.

Further, the anti-falling suction pipe and the filter are integrated, and the top of the filter is provided with a glass sealing plug.

Compared with the prior art, the beneficial effects of the present utility model are:

1) By setting the glass floating ball to block the top opening of the inner pipe of the outlet pipe or leave it from the top opening of the inner pipe of the outlet pipe, the purpose of controlling the on-off of the flue can be achieved, which can effectively prevent the sampling of flue gas and absorption liquid from sucking back;

2) The effective filtration of fine dust particles in the flue gas is achieved by setting a filter to prevent pollution from clogging the device;

3) The material of the anti-reverse suction pipe and the filter is made of quartz glass, and an electric heat tracing device is installed on the outside to ensure that the temperature inside the anti-reverse suction pipe and the filter is above 130°C, which can effectively reduce the temperature in the flue gas. Mercury adsorption, improve test accuracy;

4) The integrated design of the anti-backward suction pipe and the filter is closely connected, which makes the structure of the device more compact and light, easy to install, easy to replace the filter element, etc.;

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of anti-suckback filter of the present utility model;

Fig. 3 is the top view of the floating ball spacer of the present utility model;

Fig. 4 is a top view of the support frame of the filter element of the present invention.

Detailed ways

The utility model is described in detail below, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, so that the protection scope of the utility model can be defined more clearly.

A brief summary of one or more aspects is presented below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all contemplated aspects and is intended to neither identify key or critical elements of all aspects nor attempt to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In describing the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation , are constructed and operated in a specific orientation and therefore cannot be construed as limiting the invention.

As shown in Figure 1-4, an integrated anti-suckback filter device for sampling mercury in boiler flue gas, including a sampling pump 1, an absorption bottle set 2, an anti-suckback filter 3 and a sampling gun 4, the sampling gun One end of 4 extends into the boiler flue 5 for flue gas sampling. The other end of the sampling gun 4 is connected with the anti-suckback filter 3 and then connected with the absorption bottle group 2 and the sampling pump 1 in turn. Driven by the sampling pump 1, Sampling gun 4 starts flue gas sampling. The sampled flue gas first passes through the anti-suckback filter 3 for high-precision filtration, and then enters the absorption bottle group 2, and absorbs the flue gas through the absorption liquid in the absorption bottle group 2. At this time, the flue gas is in the Normal circulation in the sampling flue, but when the negative pressure in the boiler flue 5 is higher than the negative pressure in the sampling flue, use the glass float 8 in the anti-suckback filter 3 to block the inner pipe 9 of the outlet pipe to prevent the absorption bottle group 2 The absorption liquid in the sample and the suction of the flue gas in the sampling flue.

The absorption bottle group 2 includes several absorption bottles connected in succession, and each absorption bottle contains the same or different absorption liquid respectively.

The anti-suckback filter 3 includes a matching floating ball limit frame 6, an outer pipe of the air outlet pipe 7, a glass float 8, an inner pipe of the air outlet pipe 9, a glass sealing plug 10, a filter element 11, a filter element support frame 12, The filter 13 and the air inlet pipe 14, the outer pipe 7 of the air outlet pipe and the inner pipe 9 of the air outlet pipe form an anti-suckback pipe, which is arranged between the absorption bottle group 2 and the filter 13, on the top of the filter 13, and the bottom of the filter 13 passes through the air inlet pipe 14 Connected to the sampling gun 4, the outer pipe 7 of the air outlet pipe and the inner pipe 9 of the air outlet pipe are arranged coaxially from the outside to the inside, the bottom opening of the inner pipe 9 of the air outlet pipe is connected to the inside of the filter 13, and the top opening of the inner pipe 9 of the air outlet pipe is arranged on the outer pipe of the air outlet pipe 7, a glass float 8 is arranged at the top opening of the inner pipe 9 of the outlet pipe, and the glass float 8 can block the top opening of the inner pipe 9 of the outlet pipe or leave from the top opening of the inner pipe 9 of the outlet pipe to realize the on-off control of the flue The purpose, the inner diameter of the outer pipe 7 of the air outlet pipe is greater than the diameter of the glass float 8, the inner diameter of the inner pipe 9 of the air outlet pipe is the same as the diameter of the glass float 8, and the glass float 8 is stuck at the top opening of the inner pipe 9 of the air outlet pipe. When there is an air flow passing through, the glass floating ball 8 can rise and the air flow can flow. At this time, the sampled flue gas can enter the absorption bottle group through the filter 13 and the inner tube 9 of the outlet pipe in turn. 2 and is absorbed by the absorbent.

The top of the glass float 8 and the outer pipe 7 of the outlet pipe are provided with a float stop frame 6 to prevent the glass float 8 from flowing into the flue behind with the airflow. During normal sampling, the glass floating ball 8 rises to a certain height, and the highest position is limited by the floating ball limit frame 6, and the flue gas circulates normally. When the negative pressure is too large, the glass floating ball 8 falls back to the top of the inner pipe 9 of the outlet pipe in time The opening is used to prevent absorption liquid and flue gas from sucking back.

The middle cross of the floating ball spacer 6 adopts 316L stainless steel, and the outer circle is a corrosion-resistant rubber ring, which can play a position-limiting role, and can be put into the outlet pipe outer pipe 7 more conveniently.

The filter 13 is provided with a filter element support frame 12 matching its inner wall. The filter element 11 is placed on the filter element support frame 12. The filter element 11 is composed of multiple layers of fiber paper stacked sequentially through glue, etc., and the smoke passes through the filter element 11. It can filter dust particles above 0.5 micron.

The filter 13 preferably adopts a hollow cylinder structure, and the filter core support frame 12 is processed by 316L stainless steel, and its frame is a Pozi structure, which plays a role in supporting the filter core 11 and can also prevent the filter core 11 from blocking the intake pipe 14.

The glass sealing plug 10 is sealed and connected to the top of the filter 13 through a frosted mouth, which can not only ensure the sealing of the sampling process, but also facilitate the replacement of the filter element 11 .

In order to reduce the adsorption of flue gas mercury, the materials of the anti-suckback pipe, the glass sealing plug 10 and the filter 13 are all made of quartz glass.

The integrated design of the anti-suckback pipe and filter 13 can realize the functions of anti-suckback and high-precision filtration at the same time, and the integrated design is small in size and convenient for installation and maintenance.

At the same time, in order to prevent moisture from carrying the mercury in the flue gas to condense in the anti-suckback pipe and the filter 13, the anti-suckback pipe and the filter 13 are respectively equipped with electric heat tracing and heat preservation devices, which include electric heat tracing wires, heat preservation Asbestos and thermostat, more specifically, the outer pipe 7 of the air outlet pipe and the outside of the filter 13 are respectively wound with electric heating wires, and the electric heating wires outside the outer pipe 7 of the air outlet pipe and the outside of the filter 13 can be the same or different The heat-insulating asbestos covers the electric heating wire, and the temperature controller is connected to the electric heating wire. The electric heating wire is controlled by the temperature controller to produce different heating temperatures, so as to ensure the air outlet pipe 7 and the filter 13 The temperature is above 130°C to prevent the condensation of water vapor.

The parts or structures not specifically described in the utility model can adopt the prior art or existing products, and will not be repeated here.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the content of the utility model description, or directly or indirectly used in other related technologies Fields are all included in the scope of patent protection of the utility model in the same way.

Claims (9)

1. An anti-suckback filtering integrated device for mercury sampling in boiler flue gas is characterized in that it includes a sampling pump, an absorption bottle group, an anti-suckback filter and a sampling gun, and one end of the sampling gun can be inserted into To the boiler flue, the other end of the sampling gun is connected to the anti-suckback filter, and then connected to the absorption bottle group and the sampling pump in turn. The anti-suckback filter includes a filter and an anti-suckback pipe arranged between the absorption bottle group and the filter , the filter is provided with a filter element, and the anti-sucking tube is provided with a movable glass float. 2. An integrated anti-suckback filtering device for mercury sampling in boiler flue gas according to claim 1, characterized in that an anti-suckback pipe is provided on the top of the filter, and the bottom of the filter passes through The air pipe is connected to the sampling gun. 3. An integrated anti-suckback filtering device for mercury sampling in boiler flue gas according to claim 2, characterized in that, the anti-suckback pipe includes an outer pipe coaxially arranged from the outside to the inside of the outlet pipe and the inner pipe of the air outlet pipe, the bottom opening of the inner pipe of the air outlet pipe is connected to the inside of the filter, the top opening of the inner pipe of the air outlet pipe is arranged in the outer pipe of the air outlet pipe, a glass floating ball is arranged at the top opening of the inner pipe of the air outlet pipe, and the outer pipe of the air outlet pipe The inner diameter is greater than the diameter of the glass float, and the inner diameter of the inner tube of the air outlet pipe is the same as that of the glass float. 4. An integrated anti-suckback filtering device for mercury sampling in boiler flue gas according to claim 3, characterized in that, the top of the outer pipe of the outlet pipe is provided with a floating glass float to limit the position. The ball spacer, the glass floating ball moves in the outer pipe of the air outlet pipe, blocks the top opening of the inner pipe of the air outlet pipe or leaves from the top opening of the inner pipe of the air outlet pipe. 5. An integrated anti-suckback filtering device for mercury sampling in boiler flue gas according to claim 4, characterized in that the floating ball limit frame includes a corrosion-resistant rubber ring and a cross. 6. The anti-suckback filtering integrated device for mercury sampling in boiler flue gas according to claim 1, characterized in that, a filter element support frame is arranged inside the filter, and the filter element support frame A filter core is placed on it, and the filter core includes multiple layers of fiber paper. 7 . The integrated anti-suckback filtering device for mercury sampling in boiler flue gas according to claim 6 , wherein the support frame of the filter element is in a Pozieri-shaped structure. 8 . 8. A kind of anti-suckback filtering integrated device for mercury sampling in boiler flue gas according to claim 1, characterized in that, the anti-suckback pipe and the filter are provided with an electric heat tracing and heat preservation device for use In order to ensure that the temperature in the anti-suckback pipe and the filter is above 130°C. 9. An integrated anti-suckback filtering device for mercury sampling in boiler flue gas according to claim 1, characterized in that the anti-suckback pipe and filter are integrated in an integrated design, and the top of the filter A glass sealing plug is provided.

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