A multifunctional absorption device for SCR denitrification ammonia escape sampling test

Abstract

The present invention discloses a multifunctional absorption device for SCR denitrification ammonia escape sampling and testing, comprising a liquid storage bottle, an absorption bottle, and a dust removal filter. The liquid storage bottle is provided with ammonia absorption liquid, and the bottom of the liquid storage bottle has an interface. The absorption bottle is mounted on the bottom of the liquid storage bottle. An annular connector is mounted on the interface at the bottom of the liquid storage bottle, and the annular wall of the annular connector is a hollow mesh structure. A liquid adding rod passes through the liquid storage bottle and the annular connector. The bottom end of the liquid adding rod extends out of the liquid storage bottle and is provided with a partition plug at the bottom end. The absorption bottle has an air inlet and an air outlet, and a bypass valve is connected between the air inlet of the absorption bottle and the dust removal filter. The bypass valve has an inlet 1, an inlet 2, an outlet 1, and an outlet 2. The inlet 1 of the bypass valve is connected to the sampling pipeline, the outlet 1 is connected to the absorption bottle, and the inlet 2 and outlet 2 are respectively connected to the dust removal filter. The device can filter dust in flue gas, backwash the sampling pipeline, and automatically add ammonia absorption liquid.

Description

Technical Field

[0001] The present invention relates to the field of testing ammonia escape from a coal-fired flue gas SCR denitrification device, and in particular to a multifunctional absorption device for sampling and testing ammonia escape from an SCR denitrification device. Background Art

[0002] With the large-scale commissioning of denitrification systems in thermal power plants, ammonia leakage at the denitrification system outlets has become a growing concern. Acidic components such as SO2, SO3, NO, and NO2, produced by high-temperature coal combustion, react with ammonia to form complex ammonia compounds such as ammonium hydrogen sulfate (NH4HS04) and ammonia aluminum sulfate (NH4AL(SO4)2) on the surfaces of downstream flue gas equipment. This can quickly lead to scaling and blockage in downstream equipment such as air preheaters and dust collectors, as well as insufficient induced draft fan output and other operational difficulties.

[0003] Too much or too little NH3 injection will affect the denitrification efficiency. Under a certain boiler load, the denitrification device needs to be adjusted according to the NH3 / NO X The molar ratio of ammonia injection makes the denitrification outlet NO X The concentration value reaches the limit. In order to ensure the full reaction of nitrogen oxides and avoid new pollution caused by excessive ammonia, it is necessary to test the amount of ammonia slip, thereby controlling the concentration of ammonia slip and ensuring the stable operation of the SCR catalyst and the unit. Therefore, it is very necessary to accurately measure the trace ammonia concentration in coal-fired denitrification flue gas.

[0004] At present, the traditional chemical absorption method is mainly used for ammonia escape testing, that is, using an absorption bottle and using a certain concentration of dilute sulfuric acid absorption liquid to absorb ammonia in the flue gas, and then analyzing the NH4 in the absorption liquid. + The concentration of ammonia escape in the flue gas can be calculated by the test experience. According to the test experience, since the flue gas contains dust, a large amount of dust can be easily absorbed into the absorption liquid, causing the absorption liquid to be turbid, which seriously affects the analysis of NH4 in the absorption liquid. + concentration, causing the sampling test to fail. In order to avoid dust inhalation, a dust removal device must be installed. At the same time, to ensure the accuracy of the test, the sampling pipeline in front of the absorption bottle needs to be backwashed with absorption liquid. However, the installed dust removal device will affect the backwashing effect, which will also affect the test results. If the dust removal device is removed and then the sampling pipeline is flushed, the dust removal device must be reinstalled for the next sampling test, which undoubtedly increases the workload of the test.

[0005] The existing absorption bottle cannot avoid the inhalation of dust in the flue gas, and when the number of measuring points is large, the absorption bottle needs to be opened manually frequently to add absorption liquid, which affects the test speed. Summary of the Invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a multifunctional absorption device for SCR denitrification ammonia escape sampling test, which can filter a large amount of dust in the flue gas to avoid a large amount of dust being inhaled into the absorption liquid. It can also automatically switch to achieve backwashing of the sampling pipeline, and can also automatically add absorption liquid to improve work efficiency.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A multifunctional absorption device for SCR denitrification ammonia escape sampling test, comprising a liquid storage bottle, an absorption bottle and a dust removal filter;

[0009] The liquid storage bottle contains ammonia absorption liquid, and the bottom of the liquid storage bottle has an interface; the absorption bottle is installed on the bottom of the liquid storage bottle; an annular connector is installed on the interface at the bottom of the liquid storage bottle, and the annular connector has an annular wall with a hollow mesh structure; a liquid adding rod passes through the liquid storage bottle and the annular connector from top to bottom; the bottom end of the liquid adding rod extends out of the liquid storage bottle, and the bottom end is provided with a partition plug; the liquid adding rod can drive the partition plug to move up and down;

[0010] The absorption bottle has an air inlet and an air outlet, and a bypass valve is connected between the air inlet of the absorption bottle and the dust removal filter; the bypass valve has inlet 1, inlet 2, outlet 1 and outlet 2, inlet 1 of the bypass valve is connected to the sampling pipeline, outlet 1 is connected to the absorption bottle, and inlet 2 and outlet 2 are respectively connected to the dust removal filter.

[0011] Furthermore, a sleeve is provided on the lower part of the liquid adding rod, and a spring is provided between the sleeve and the annular connector; when the liquid adding rod is pressed down, the spring is compressed, the partition plug is separated from the interface of the liquid storage bottle, and the ammonia absorption liquid in the liquid storage bottle enters the absorption bottle through the hollow mesh structure of the annular connector.

[0012] Furthermore, the inlet 1 is arranged in parallel with the outlet 1, the inlet 2 is arranged in parallel with the outlet 2, and the inlet 1 and outlet 1 are arranged perpendicular to the inlet 2 and outlet 2.

[0013] Furthermore, the bypass valve has a piston rod, and a piston plate is provided on the piston rod.

[0014] Furthermore, the number of the piston plates is four, and the passage into the dust filter can be opened or closed by moving the piston plates using the piston rod.

[0015] Furthermore, the upper end of the liquid adding rod extends out of the liquid storage bottle, and a handle is provided on the upper end of the rod.

[0016] Furthermore, the partition plug is a rubber plug.

[0017] Beneficial effects of the present invention:

[0018] The device is provided with a dust removal filter, which is connected to the absorption bottle through a bypass valve; the dust removal filter can be opened or closed by the bypass valve, so that when the normal ammonia absorption work is carried out, the flue gas can pass through the dust removal filter, thereby filtering the dust in the flue gas, avoiding the ammonia absorption liquid in the absorption bottle from inhaling a large amount of dust, and thus avoiding the NH4 in the ammonia absorption liquid. + When the sampling line needs to be backwashed, the bypass valve can be used to close the dust filter passage so that the backwashed ammonia absorption liquid does not enter the dust filter. The ammonia absorption liquid flushes the sampling line and finally enters the absorption bottle to ensure the accuracy of the ammonia escape test.

[0019] In addition, the liquid storage bottle of the device is also provided with a liquid adding rod, the bottom end of the liquid adding rod is provided with a partition plug, and the bottom interface of the liquid storage bottle is provided with a ring connector with a hollow mesh structure; when it is necessary to add ammonia absorption liquid to the absorption bottle, the liquid adding rod is used to drive the partition plug to move downward, and the interface of the liquid storage bottle can be opened to allow the ammonia absorption liquid in the liquid storage bottle to enter the absorption bottle through the hollow mesh structure of the ring connector, thereby realizing automatic addition of ammonia absorption liquid, eliminating the need to frequently manually open the absorption bottle to add ammonia absorption liquid, and improving the speed of ammonia escape test.

[0020] The device can improve the accuracy of sampling testing, and has the advantages of simple structure, reusability, simple maintenance and high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of a multifunctional absorption device for SCR denitrification ammonia escape sampling test according to the present invention.

[0022] Figure 2 This is a top view of a multifunctional absorption device for SCR denitrification ammonia escape sampling test according to the present invention.

[0023] Figure 3 This is a schematic diagram of the bypass valve in the present invention when performing normal ammonia absorption work.

[0024] Figure 4 This is a schematic diagram of the bypass valve in the present invention when performing backwashing of the sampling pipeline. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0026] like Figure 1 and Figure 2The multifunctional absorption device shown is used for the SCR denitrification ammonia escape sampling test, comprising a liquid storage bottle 1, an absorption bottle 2 and a dust removal filter 3;

[0027] The liquid storage bottle 1 is provided with an ammonia absorption liquid, and the top of the liquid storage bottle 1 is provided with a liquid filling port 11 for adding the ammonia absorption liquid to the liquid storage bottle 1, and the bottom of the liquid storage bottle 1 is provided with an interface; the absorption bottle 2 is installed on the bottom of the liquid storage bottle 1; an annular connector 4 is installed on the interface at the bottom of the liquid storage bottle 1, and the annular wall of the annular connector 4 is a hollow mesh structure; a liquid adding rod 5 passes through the liquid storage bottle 1 and the annular connector 4 from top to bottom; the upper end of the liquid adding rod 5 extends out of the liquid storage bottle 1, and a handle 51 is provided on the upper end of the liquid adding rod 5 The bottom end of the liquid adding rod 5 extends out of the liquid storage bottle 1, and a partition plug 52 is provided at the bottom end thereof; in this embodiment, the partition plug 52 is a rubber plug; the liquid adding rod 5 can drive the partition plug 52 to move up and down; specifically, a sleeve 53 is provided on the lower part of the liquid adding rod 5, and a spring 6 is provided between the sleeve 53 and the annular connector 4 and is mounted on the liquid adding rod 5; when the liquid adding rod 5 is pressed down, the spring 6 is compressed, the partition plug 52 is separated from the interface of the liquid storage bottle 1, and the ammonia absorption liquid in the liquid storage bottle 1 enters the absorption bottle 2 through the hollow mesh structure of the annular connector 4.

[0028] The absorption bottle 2 has an air inlet 21, an air outlet 22 and a liquid discharge port 23. The air inlet 21 of the absorption bottle 2 is connected to the dust removal filter 3 through a pipeline via a bypass valve 7; the bypass valve 7 has an inlet 1 71, an inlet 2 72, an outlet 1 73 and an outlet 2 74. The inlet 1 71 is arranged in parallel with the outlet 1 73, the inlet 2 72 is arranged in parallel with the outlet 2 74, and the inlet 1 71, the outlet 1 73 and the inlet 2 72, the outlet 2 74 are arranged vertically; the inlet 1 71 of the bypass valve 7 is connected to the sampling pipeline, its outlet 1 73 is connected to the absorption bottle 2, and its inlet 2 72 and outlet 2 74 are respectively connected to the dust removal filter 3.

[0029] The bypass valve 7 has a piston rod 75, on which a piston plate 76 is provided. There are four piston plates 76, and the passage to the dust filter 3 can be opened or closed by moving the piston plates 76 by the piston rod 75. The four piston plates 76 are positioned as follows. Figure 3 When the position state is shown, the inlet 1 71, outlet 2 74, inlet 2 72, and outlet 1 73 of the bypass valve 7 are connected in series, and the passage into the dust filter 3 is opened; the four piston plates 77 are in the position shown. Figure 4 In the position shown, the bypass valve 7 uses only the inlet 71 and the outlet 73, and the passage into the dust filter 3 is closed.

[0030] During normal ammonia absorption, the four piston plates 76 are in the following positions: Figure 3In the position state shown, the inlet 1 71, outlet 2 74, inlet 2 72, and outlet 1 73 of the bypass valve are connected in series, and the passage to the dust removal filter 3 is opened; the flue gas in the sampling pipeline passes through the inlet 1 71 and outlet 2 74 of the bypass valve in turn and enters the dust removal filter 3, and the dust removal filter 3 filters the dust in the flue gas; the filtered flue gas flows out through the inlet 2 72 and outlet 1 73 of the bypass valve in turn, and then enters the absorption bottle 2; the ammonia absorption liquid in the absorption bottle 2 absorbs the ammonia in the flue gas; the flue gas after ammonia absorption treatment flows out through the gas outlet 22 of the absorption bottle 2.

[0031] When the sampling line needs to be backwashed, the position of the four piston plates is changed by the piston rod of the bypass valve 7 so that the four piston plates are in the following positions: Figure 4 In the position shown, the bypass valve uses only inlet 71 and outlet 73, and the passage to dust filter 3 is closed. Ammonia absorption liquid is introduced into the sampling line to backwash it. The ammonia absorption liquid after flushing does not enter dust filter 3, but passes through inlet 71 and outlet 73 of bypass valve 7 before entering absorption bottle 2.

[0032] When ammonia absorption liquid needs to be added to absorption bottle 2, the addition rod 5 is pressed, which drives the partition plug 52 downward, compressing the spring 6, opening the interface of the liquid storage bottle 1, and the ammonia absorption liquid in the liquid storage bottle 1 enters the absorption bottle 2 through the hollow mesh structure of the annular connector 4. The absorption bottle 2 is provided with a volume scale. When the ammonia absorption liquid is added to the required volume, the addition rod 5 is released. Under the action of the spring 6, the addition rod 5 rebounds upward, and the partition plug 52 seals the interface of the liquid storage bottle 1, completing the addition process of the ammonia absorption liquid.

[0033] After the sampling is completed, the ammonia absorption liquid is discharged through the liquid discharge port 23 of the absorption bottle 2, and then the ammonia content in the ammonia absorption liquid is measured and analyzed.

[0034] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multifunctional absorption device for SCR denitrification ammonia escape sampling test, characterized by: Including liquid storage bottle, absorption bottle and dust removal filter; The liquid storage bottle contains ammonia absorption liquid, and the bottom of the liquid storage bottle has an interface; the absorption bottle is mounted on the bottom of the liquid storage bottle; an annular connector is mounted on the interface at the bottom of the liquid storage bottle, and the annular wall of the annular connector is a hollow mesh structure; a liquid adding rod passes through the liquid storage bottle and the annular connector from top to bottom; the bottom end of the liquid adding rod extends out of the liquid storage bottle, and the bottom end is provided with a partition plug; the liquid adding rod can drive the partition plug to move up and down; The absorption bottle has an air inlet and an air outlet, and a bypass valve is connected between the air inlet of the absorption bottle and the dust removal filter; the bypass valve has an inlet 1, an inlet 2, an outlet 1 and an outlet 2, the inlet 1 of the bypass valve is connected to the sampling pipeline, the outlet 1 is connected to the absorption bottle, and the inlet 2 and outlet 2 are respectively connected to the dust removal filter; the inlet 1 is arranged parallel to the outlet 1, the inlet 2 is arranged parallel to the outlet 2, and the inlet 1 and outlet 1 are arranged perpendicular to the inlet 2 and outlet 2; The bypass valve has a piston rod, on which piston plates are provided; there are four piston plates, and the passage into the dust removal filter can be opened or closed by moving the piston plates using the piston rod.

2. The multifunctional absorption device for SCR denitrification ammonia escape sampling test according to claim 1, characterized in that: The lower part of the liquid adding rod is sleeved with a ferrule, and a spring is provided between the ferrule and the annular connector; when the liquid adding rod is pressed down, the spring is compressed, the partition plug is separated from the interface of the liquid storage bottle, and the ammonia absorption liquid in the liquid storage bottle enters the absorption bottle through the hollow mesh structure of the annular connector.

3. The multifunctional absorption device for SCR denitrification ammonia escape sampling test according to claim 1, characterized in that: The upper end of the liquid adding rod extends out of the liquid storage bottle and is provided with a handle.

4. The multifunctional absorption device for SCR denitrification ammonia escape sampling test according to claim 1, characterized in that: The partition plug is a rubber plug.

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