Auxiliary support for low-concentration particulate matter sampling head

Abstract

The utility model discloses an auxiliary support for a low-concentration particulate matter sampling head, which is fixedly arranged at a sampling end of a flue gas sampling gun extending into an orthographic projection range of a to-be-detected smoke outlet, and comprises a protective cylinder and connecting flanges coaxially inserted at two ends of the protective cylinder; the side wall of the pile casing is provided with a sampling port for allowing flue gas to escape into the inner space of the pile casing; the connecting flanges are used for fixing the sampling heads at the two ends in the protective cylinder in the direction facing the sampling port and the direction back to the sampling port respectively, and the connecting flange for fixing the sampling head facing the sampling port is connected with the sampling gas inlet end of the flue gas sampling gun. The auxiliary support can position the sampling head at the smoke exhaust port of the flue for a long time according to standard requirements in a posture of facing / backing on to the sampling port so as to meet the requirement of'full-program blank 'specified by the standard.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of smoke sampling and weighing, and particularly to an auxiliary support for a low-concentration particulate matter sampling head. BACKGROUND

[0002] According to existing standards, a method of filtering in a flue is required during the waste sampling process, and a low-concentration sampling head containing a filter medium is used. During sampling, the particulate matter sampling tube is inserted into the flue from the sampling hole, and a certain amount of waste gas containing particulate matter is extracted using the principle of constant-speed sampling. During this process, the main sampling head is connected to the negative pressure of the sampling gun. After sampling is completed, the sampling head is disassembled and the filter membrane inside is removed for weighing and counting. Then, according to the amount of particulate matter captured on the filter membrane in the sampling head and the volume of waste gas extracted at the same time, the concentration of particulate matter in the waste gas is calculated.

[0003] In addition, a blank sample needs to be collected during sampling of the main sampling head as a calibration value of the amount of particulate matter under the same environment. The standard "Determination of Low Concentration Particulate Matter in Waste Gas from Fixed Pollution Sources - Gravimetric Method" (HJ 836-2017) stipulates that a full-process blank should be performed once during each measurement series and at least once a day. Any sample with a weight gain less than the full-process blank is invalid. The blank sample is collected in the same sampling plane under the condition that the working conditions are basically the same and the pollution treatment facilities are stably operated.

[0004] The so-called full-process blank refers to the collection of at least one full-process blank sample during each sampling. Except for not collecting waste gas, other operation steps (including preparation, transportation, and on-site operation of sampling equipment) are the same as those of the actual sample. The increment (the weight after on-site sampling minus the weight before sampling) should not exceed 10% of the emission limit value (the emission limit value in the emission permit or self-monitoring scheme of the sampling port). This is to check whether there is external particulate matter pollution during the sampling process. For example, if the increment of the blank sample is too large, it means that the sampling equipment or the operation process may have introduced particulate matter, and the measurement result of the actual sample may not be accurate. Moreover, any sample with a weight gain less than the full-process blank is invalid, which ensures that the measurement result truly reflects the content of particulate matter in the waste gas. During the sampling process, the sampling nozzle should face away from the direction of the waste gas flow, and the sampling tube should be placed in the flue for the same time and moved in the same way as during actual sampling.

[0005] However, in the prior art, the sampling of blank samples is often not standard due to the fact that the existing sampling gun cannot fix two sampling heads at the same time with one facing the sampling port and the other facing away from the sampling port. Therefore, the fixing support of the blank sampling head can only be temporarily built by manual work on the basis of the standard sampling of the regular main sampling head, or the blank sampling head is simply manually held by a long rod for a short time to deliver the blank sampling head to the flue exhaust port for blank sampling. However, the above-mentioned blank sample sampling method is not standard and cannot be kept for a long time with the main sampling head.

[0006] Therefore, how to design a low-concentration particulate matter sampling head auxiliary support to ensure the standardized positioning of the main sampling head and the blank sample sampling head has become a technical problem to be solved by the person skilled in the art. Content of the utility model

[0007] The utility model aims at solving at least one of the technical problems existing in the prior art. To this end, the utility model provides a low-concentration particulate matter sampling head auxiliary support. The auxiliary support can position the sampling head in the attitude of facing / towards the sampling port at the flue exhaust port for a long time according to the standard requirements, so as to realize the "full program blank" requirement specified by the standard.

[0008] In order to solve the above-mentioned problems, the utility model provides a low-concentration particulate matter sampling head auxiliary support. The auxiliary support is fixedly arranged at the sampling end of the flue gas sampling gun which projects into the range of the normal projection of the measured exhaust port. The auxiliary support comprises a protective tube and connecting flanges coaxially inserted into both ends of the protective tube. A sampling port for accommodating the flue gas escaping into the internal space of the protective tube is arranged on the side wall of the protective tube. The connecting flanges are fixedly arranged at both ends of the protective tube in the direction of facing the sampling port and facing away from the sampling port, and the connecting flange fixedly arranged in the direction of facing the sampling port is connected with the sampling inlet end of the flue gas sampling gun.

[0009] Preferably, external threads are arranged on the outer periphery of the flange pipes at both ends of the connecting flange, and a convex ring for supporting the sampling head in the axial direction is integrally arranged in the inner part of the connecting flange. In addition, internal threads are arranged on the inner periphery of the flange pipe at one end of the connecting flange for positioning the sampling head.

[0010] Preferably, a threaded compression ring is connected with the internal threads, and the threaded compression ring is axially matched with the convex ring in the inner part of the connecting flange to lock the sampling head.

[0011] Preferably, the sampling head facing the sampling port is used as the main sampling head, the exhaust end of the sampling head is communicated with the internal space of the sampling gun, and the sampling gun applies air negative pressure to the internal space of the protective tube through the sampling head.

[0012] The sampling head facing away from the sampling port is used as the blank sample sampling head, and the exhaust end of the blank sample sampling head is communicated with the atmosphere.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The utility model discloses a low concentration particulate matter sampling head auxiliary support, and the fixing of the sampling head at the both ends of the protection cylinder is carried out through the connecting flange, and the connecting and fixing of the protection cylinder and the sampling gun are carried out through the connecting flange. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] Figure 1 It is the sectional view of the utility model;

[0017] In the figure: 1 - sampling gun;2 - connecting flange;3 - protection cylinder;4 - main sampling head;5 - blank sample sampling head;6 - threaded pressure ring;7 - convex ring;8 - sampling port. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as the limitation of the present application.

[0019] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] The utility model will be further described in detail below in combination with the drawings.

[0021] The utility model provides a kind of low concentration particulate matter sampling head auxiliary support, auxiliary support is fixed in the sampling end of the projection range inside of flue gas sampling gun 1 probe into the measured exhaust port, the auxiliary support includes casing 3 and the connecting flange 2 coaxially inserted in both ends of casing;Sampling port 8 for accommodating flue gas to escape into the internal space of casing is opened on the side wall of casing;The connecting flange is fixed sampling head in the direction of towards sampling port and away from sampling port at both ends inside casing respectively, wherein the connecting flange fixed towards sampling port sampling head is connected with the sampling inlet end of flue gas sampling gun.

[0022] Preferably, outer thread is made on the outer periphery of flange pipe of both ends of connecting flange, convex ring 7 for axially supporting sampling head is integrally made in the inside of connecting flange, and inner thread is further made on the inner periphery of flange pipe of the end of connecting flange for positioning sampling head.

[0023] Preferably, threaded compression ring 6 is connected by meshing on inner thread, and the threaded compression ring is axially matched with the convex ring in the inside of connecting flange to lock sampling head.

[0024] Preferably, sampling head towards sampling port is used as main sampling head 4, and the exhaust end of the sampling head is communicated with the inside of sampling gun, and air negative pressure is applied to the inside of casing by sampling gun through sampling head;

[0025] Sampling head away from sampling port is used as blank sample sampling head 5, and the exhaust end of the blank sample sampling head is communicated with atmosphere.

[0026] The working principle of the utility model is as follows:

[0027] The main sampling head and blank sample sampling head used in the utility model are same type sampling heads of same batch factory production, same batch transportation and same batch installation, and the sampling heads are axially positioned on the convex ring of connecting flange during installation process, and at this time, threaded compression ring is connected on the inner thread of flange pipe of one end of connecting flange but not tightened, so as to complete preliminary assembly of auxiliary support.

[0028] After preliminary assembly is completed, outer thread of flange pipe of one end of connecting flange is linked in sampling gun, and then the orientation of main sampling head and blank sample sampling head is adjusted by person from sampling port, and finally threaded compression ring in the inside of end flange pipe of two connecting flanges is locked.

[0029] If the sampling port size is small and it is difficult to screw the threaded pressure ring of the tool through the sampling port, a marking pen can be used to draw lines on the protective cylinder and the connecting flange during the preliminary assembly of the auxiliary support. Two lines are drawn on the connecting flange, one of which is a positioning line after the connecting flange is screwed on the protective cylinder, and the other is a positioning line of the sampling head after the threaded pressure ring is screwed. The above positioning lines are used to position the direction of the sampling head, that is, the threaded pressure ring is screwed in the preliminary assembly stage, and finally the auxiliary support is connected on the sampling gun after the overall assembly is completed, so that the sampling port on the auxiliary support is directed to the flue gas discharge direction, thereby ensuring the direction of the main sampling head and the blank sampling head and the sampling standardization quality.

[0030] The above describes the utility model and its implementation, which is not limited, and the drawings shown are only one of the embodiments of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired, without departing from the creative purpose of the utility model, similar structure modes and embodiments are not creatively designed without departing from the creative purpose of the utility model, which should belong to the protection scope of the utility model.

Claims

1. A low concentration particulate matter sampling head auxiliary support, characterized by: The auxiliary support is fixed at the sampling end of the flue gas sampling gun which projects into the range of the normal projection of the exhaust port to be measured, and the auxiliary support comprises a casing and connecting flanges coaxially inserted into both ends of the casing; a sampling port for accommodating the flue gas escaping into the internal space of the casing is formed on the side wall of the casing; the connecting flanges are respectively fixed at both ends of the casing to fix the sampling heads in the direction towards the sampling port and the direction away from the sampling port, wherein the connecting flange fixed with the sampling head towards the sampling port is connected with the sampling inlet end of the flue gas sampling gun.

2. The low concentration particulate matter sampling head auxiliary support of claim 1, wherein: The outer periphery of the flange pipe at both ends of the connecting flange is provided with external threads, the internal part of the connecting flange is integrally provided with a convex ring for axially supporting the sampling head, and the inner periphery of the flange pipe at the end of the connecting flange for positioning the sampling head is further provided with internal threads.

3. The low concentration particulate matter sampling head auxiliary support of claim 2, wherein: The internal threads are engaged with a threaded compression ring, the threaded compression ring is axially matched with the convex ring in the internal part of the connecting flange to lock the sampling head.

4. The auxiliary support for the low-concentration particulate matter sampling head according to claim 1, characterized in that: the sampling head towards the sampling port serves as a main sampling head, the exhaust end of the sampling head is communicated with the internal part of the sampling gun, and the sampling gun applies air negative pressure to the internal part of the casing through the sampling head; the sampling head away from the sampling port serves as a blank sample sampling head, and the exhaust end of the blank sample sampling head is communicated with the atmosphere.

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