Online sampling device for desulfurization wastewater zero discharge spray drying tower

Abstract

The invention discloses an online sampling device for a desulfurization wastewater zero-discharge spray drying tower, relates to the technical field of drying tower sampling, and solves the problems that an existing sampling device adopts single-point sampling, a sample with a certain length size cannot be obtained, and materials are not protected in the sampling process. The sampling device is installed on a drying tower cylinder and comprises a plurality of fixed bases detachably connected to the drying tower cylinder, a rotating cover plate is rotationally connected into the fixed bases, an operating handle is connected to the outer side of the rotating cover plate, a protective cover is connected to the inner side of the rotating cover plate, a sampling pipe is connected to the inner side of the fixed bases and extends into the drying tower cylinder, and a sampling opening is formed in one side of the sampling pipe. And the protective cover is driven by the rotating cover plate to rotate to block or leave the sampling port. On-line sampling can be carried out within a certain length range from the tower wall in the drying tower, and the obtained sample is protected by the protective cover, so that the sample is prevented from being sucked or blown away by negative pressure in the drying tower when taken out.

Description

Technical Field

[0001] The invention relates to the technical field of drying tower sampling, in particular to an online sampling device for a zero-discharge spray drying tower for desulfurization wastewater. Background Art

[0002] Currently, the mainstream technology for achieving zero-emission desulfurization wastewater from thermal power plants is spray drying. This technology uses rotary atomization or two-fluid atomization to transform desulfurization wastewater into micron-sized droplets within a drying tower. A portion of the high-temperature flue gas after denitrification is then introduced to the drying tower for drying. The dried dust and flue gas then mix with the main flue gas and enter the dust collector.

[0003] During commissioning and operation of a zero-discharge spray dryer for desulfurization wastewater, the internal operation of the dryer and the drying status of the desulfurization wastewater droplets could not be observed. After shutting down the system, the observation holes in the dryer were opened to observe material sticking to the wall. After adjusting the parameters, commissioning continued, and after repeated adjustments to the operating parameters, a stable operating point was determined. However, due to the frequent fluctuations in power plant load, flue gas volume and temperature also fluctuated, resulting in a very long commissioning cycle. During this period, problems such as material sticking to the wall and incomplete evaporation could occur, causing desulfurization wastewater to corrode the dryer. Severe material sticking to the wall required manual cleaning, which was time-consuming and labor-intensive.

[0004] By installing an online sampling device on the drying tower, real-time observation of the operation status inside the tower can be achieved, and real-time adjustments can be made based on the observation results. The sampling device of the desulfurization wastewater zero-discharge spray drying tower must meet the following requirements: 1) Ability to observe the drying condition within a certain distance from the tower wall by sampling to characterize the operation condition in the cross section; 2) When the drying tower operates well, the obtained dry material has good fluidity. When the drying tower operates poorly, the obtained wet material has poor fluidity. The online sampling device must be able to work normally under both normal and abnormal operating conditions of the drying tower. 3) The drying tower operates under slightly negative pressure. When taking out samples, the airflow at the sampling port must be shielded to prevent the airflow from blowing the samples away.

[0005] Existing sampling devices include insertable single-point quantitative samplers for powder silos, intermittent single-point samplers for pipelines, and automatic spiral online single-point samplers for pipelines. These devices have the following defects: 1) All sampling is done at a single point, and samples of a certain length and size cannot be obtained; 2) It is suitable for dry materials with good fluidity, but not suitable for wet materials with poor fluidity; 3) The materials are not protected during the sampling process and may be blown away by wind.

[0006] Based on the above reasons, the current sampling devices are not suitable for desulfurization wastewater zero emission drying towers. Summary of the Invention

[0007] The purpose of the present invention is to provide an online sampling device for a zero-emission spray drying tower for desulfurization wastewater, which can perform online sampling within a certain length range from the tower wall in the drying tower, and protect the obtained samples by a protective cover to prevent the samples from being sucked away by the negative pressure in the drying tower or otherwise blown away when they are taken out.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions: An online sampling device for a zero-discharge spray drying tower for desulfurization wastewater is installed on the drying tower cylinder and includes several fixed bases that are detachably connected to the drying tower cylinder. A rotating cover is rotatably connected to the fixed base, an operating handle is connected to the outer side of the rotating cover, and a protective cover is connected to the inner side of the rotating cover. A sampling tube is connected to the inner side of the fixed base, and the sampling tube extends into the drying tower cylinder. A sampling port is provided on one side of the sampling tube. The protective cover rotates under the drive of the rotating cover to block or leave the sampling port.

[0009] Furthermore, the sampling port is opened on the upper side of the sampling tube.

[0010] Furthermore, the protective cover is rotatably connected to the outside of the sampling tube.

[0011] Furthermore, a circle of grooves is respectively provided on the outer circumference of both ends of the sampling tube, the sampling port is located between the two grooves, a rolling element is installed in the groove, and is connected to the protective cover through the rolling element.

[0012] Furthermore, the rolling element includes a plurality of front balls and rear balls located in corresponding grooves.

[0013] Furthermore, a positioning bolt is connected between the rotating cover plate and the protective cover.

[0014] Furthermore, a through hole groove is provided in the fixed base for the positioning bolt to rotate around the axis of the rotating cover.

[0015] Furthermore, an equipment flange is connected to the outside of the drying tower cylinder, and the fixed base is detachably connected to the equipment flange.

[0016] In summary, the present invention has the following beneficial effects: This device can take online samples within a certain length range from the tower wall in the drying tower. By taking samples, the operating conditions at different positions in the drying tower can be observed. The device samples the solid materials in the drying tower along with the drying process, and the sampling is accumulated over time, so the judgment of the operation status in the drying tower is real-time; This device adopts a mechanical structure. The protective cover and the sampling tube are positioned with each other and rotated by the front and rear balls. Even if the drying tower operates abnormally and the material is not fully dried, unqualified samples can still be obtained, which is convenient for the operation and debugging personnel to analyze the abnormality and make timely adjustments. The device uses a protective cover to protect the sample taken out, so as to prevent the sample from being sucked away by the negative pressure in the drying tower when it is taken out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of an online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to the present invention; Figure 2 This is a right view of an online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to the present invention; Figure 3 yes Figure 1 Cross-sectional view along AA direction in the open state; Figure 4 yes Figure 1 Cross-sectional view along AA direction in the closed state.

[0019] In the figure, 01, operating handle; 02, rotating cover; 03, positioning bolt; 04, fixed base; 05, protective cover; 06, front ball bearing; 07, sampling tube; 08, equipment flange; 09, drying tower cylinder; 10, rear ball bearing. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. This embodiment does not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0021] An online sampling device for a zero-discharge spray drying tower for desulfurization wastewater, such as Figure 1 Figure 2 As shown, it is installed on the drying tower cylinder 09, including several fixed bases 04 that are detachably connected to the drying tower cylinder 09. Specifically, a sampling through hole is opened in the drying tower cylinder 09, and the equipment flange 08 is fixedly connected to the sampling through hole by welding or other means. The fixed base 04 is detachably connected to the equipment flange 08 by screws or other means; The fixed base 04 is rotatably connected to a rotating cover plate 02, which can be rotated by means of bearings or the like. In this embodiment, the inner end of the rotating cover plate 02 is connected to a limit block, and the limited rotation is achieved by inserting the limit block into the annular limit groove provided on the outer surface of the fixed base 04. The outer side of the rotating cover plate 02 is connected to an operating handle 01, and the inner side is connected to a protective cover 05. The inner side of the fixed base 04 is connected to a sampling tube 07, which extends into the drying tower cylinder 09. A sampling port is provided on one side of the sampling tube 07. The protective cover 05 rotates under the drive of the rotating cover plate 02 to block or leave the sampling port. In this embodiment, the end of the sampling tube 07 and the inner side of the fixed base 04 are welded to form an inseparable whole; the sampling port is opened on the upper side of the sampling tube 07, and the protective cover 05 is rotatably connected to the outer side of the sampling tube 07.

[0022] like Figure 2 As shown, in order to improve the rotational stability of the protective cover 05, a circle of grooves is provided on the outer circumference of each end of the sampling tube 07. The sampling port is located between the two grooves. Rolling elements are installed in the grooves and connected to the protective cover 05 through the rolling elements. The rolling elements include a plurality of front balls 06 and rear balls 10 respectively located in the corresponding grooves, which can also be replaced by existing structures such as bearings. The end of the protective cover 05 extends outwardly with a flange edge, and the positioning bolt 03 is connected between the rotating cover 02 and the flange edge of the protective cover 05. An arc-shaped through-hole groove is provided in the fixed base 04 for the positioning bolt 03 to rotate around the axis of the rotating cover 02. The angle of the arc-shaped through-hole groove corresponds to the rotation path of the protective cover 05, allowing the protective cover 05 to completely block or leave the sampling port.

[0023] During installation, the protective cover 05 is inserted into the sampling tube 07 along the axial direction. During the insertion process, the front ball 06 and the rear ball 10 are installed in the grooves at the front and rear ends of the sampling tube 07. The protective cover 05 is connected to the rotating cover plate 02 and the fixed base 04 using the positioning bolts 03. After the connection, the protective cover 05, the positioning bolts 03 and the rotating cover plate 02 are relatively fixed. Under the drive of the operating handle 01, it can rotate around the axis in the through-hole groove of the fixed base 04. After the device is assembled, the fixed base 04 and the equipment flange 08 on the drying tower cylinder 09 are fastened with bolts, and the sampling device is inserted into the drying tower to complete the equipment installation.

[0024] Working principle: like Figure 3 and Figure 4 As shown in the cross-sectional view, a sampling port is symmetrically opened above the sampling tube 07, with an opening angle of α, and an angle of the protective cover 05 of β, α<β, so that the protective cover 05 can completely cover the sampling port above the sampling tube 07; Turn the operating handle 01 until the positioning bolt 03 abuts against the corresponding end of the through-hole groove of the fixed base 04 (for example, in this embodiment, the operating handle 01 is placed in the "open" position). At this time, the relative positions of the protective cover 05 and the sampling tube 07 are shown. Figure 3 Cross-sectional view (open state), the protective cover 05 is completely away from the sampling port above the sampling tube 07, and the drying products produced by the operation of the drying tower are collected in the sampling tube 07; When observation is required, place the operating handle 01 at the other end ("off" position). At this time, the relative positions of the protective cover 05 and the sampling tube 07 are shown in Figure 2. Figure 4 Cross-sectional view (closed state), the protective cover 05 completely covers the sampling port above the sampling tube 07, and the dry product collected in the sampling tube 07 is protected by the protective cover 05; Remove the connecting screws between the fixed base 04 and the equipment flange 08 on the drying tower cylinder 09, pull out the sampling device, and put the operating handle 01 in the "open" position. At this time, the relative position of the protective cover 05 and the sampling tube 07 is shown. Figure 3 (Open state), the protective cover 05 completely leaves the sampling port above the sampling tube 07, and the dry product collected in the sampling tube 07 can be observed.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. An online sampling device for a zero-discharge spray drying tower for desulfurization wastewater, characterized by: It is installed on the drying tower cylinder and includes several fixed bases that are detachably connected to the drying tower cylinder. A rotating cover is rotatably connected to the fixed base. The outer side of the rotating cover is connected to an operating handle and the inner side is connected to a protective cover. A sampling tube is connected to the inner side of the fixed base. The sampling tube extends into the drying tower cylinder. A sampling port is opened on one side of the sampling tube. The protective cover rotates under the drive of the rotating cover to block or leave the sampling port.

2. The online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to claim 1, characterized in that: The sampling port is opened on the upper side of the sampling tube.

3. An online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to claim 1 or 2, characterized in that: The protective cover is rotatably connected to the outside of the sampling tube.

4. The online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to claim 3, characterized in that: A circle of grooves is respectively provided on the outer circumference of both ends of the sampling tube. The sampling port is located between the two grooves. Rolling parts are installed in the grooves and are connected to the protective cover through the rolling parts.

5. The online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to claim 4, characterized in that: The rolling element includes a plurality of front balls and rear balls located in corresponding grooves.

6. The online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to claim 1, characterized in that: Positioning bolts are connected between the rotating cover plate and the protective cover.

7. The online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to claim 6, characterized in that: The fixed base is provided with a through hole groove for the positioning bolt to rotate around the axis of the rotating cover plate.

8. The online sampling device for a zero-discharge spray drying tower for desulfurization wastewater according to claim 1, characterized in that: The drying tower cylinder is externally connected to an equipment flange, and the fixed base is detachably connected to the equipment flange.

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