Adsorbent feeding and dispensing device

Abstract

The present invention relates to an adsorbent feeding and distribution device, comprising a feeding unit and a mixing and distribution unit connected to the feeding unit, wherein the feeding unit comprises a high-speed airflow supply component, an adsorbent supply component, and an ejector connected to the high-speed airflow supply component and the adsorbent supply component at the same time, and the ejector is connected to the mixing and distribution unit; the mixing and distribution unit comprises a shell, a feeding spray gun arranged in the shell, and a plurality of distribution branches arranged on the top of the shell, and the bottom of the shell has a dilution air inlet; the feeding spray gun extends in the up-and-down direction of the shell, the inlet of the feeding spray gun is located at the top, the outlet of the feeding spray gun is located at the bottom, and the ejector is connected to the inlet of the feeding spray gun. The present invention can meet the requirements of the alkali dry powder injection removal SO3 system of a large coal-fired power station boiler, improve the system reliability and economy, and improve the uniformity of distribution.

Description

Technical Field

[0001] The invention relates to an adsorbent feeding and distributing device. Background Art

[0002] After the ultra-low emission transformation of coal-fired power plants, tail facilities such as low-temperature economizers, wet desulfurization, and wet electrostatic precipitators can remove most of the SO in flue gas. 3 , but it does not help to solve SO 3 The resulting problems include limited peak load depth of the unit, severe blockage of ammonium bisulfate in the air preheater and low-temperature economizer, etc. Alkaline dry powder adsorbent is installed at the inlet of the SCR denitrification device to spray and remove SO 3 The system helps to solve the above problems.

[0003] Alkali dry powder adsorbent injection to remove SO 3 The system belongs to the dry desulfurization technology, and the removal efficiency is directly related to the mixing effect of flue gas and adsorbent. In order to improve the mixing uniformity of dry powder adsorbent and flue gas, it is usually necessary to arrange multiple spray guns in the flue cross section grid method and ensure the uniformity of adsorbent flow distribution of each spray gun.

[0004] See the patent publication number CN205165028U which discloses a method for removing SO 3 The dry powder atomization injection device includes a dry powder storage system, a dry powder conveying system, and a dry powder injection system. The dry powder conveying system is connected to the injection system. The high wind pressure provided by the fan to the injector blows the alkali dry powder in the silo into the distributor, and then enters the flue after being dispersed by the distributor and mixes with SO 3 Reaction. It noticed the requirement of this technology for the uniformity of dry powder adsorbent dosage at the inlet of each injector. The design idea is to use high-pressure wind to blow the alkali dry powder in the silo into the distributor, and then disperse it into the flue after being dispersed by the distributor. The distributor it designed is to insert a bundle of branch pipes into a circular pipe with a larger diameter. However, under the action of gravity and centrifugal force, the distribution of dry powder adsorbent in the circular pipe at the inlet of the distributor is uneven, which leads to uneven adsorbent dosage in each branch pipe downstream; moreover, with the increase of the number of branch pipes and the diameter of the distributor circular pipe, the difference in adsorbent dosage in each branch pipe will further expand.

[0005] In addition, the cross-sectional dimensions of the inlet and outlet flues of the SCR denitrification device of large-scale coal-fired power plant boilers are usually 10~20 m wide and 2.5~4.5 m deep, with a designed flue gas velocity of 15 m / s. It is necessary to arrange 10~40 adsorbent spray guns by grid method, and each spray gun is equipped with an adsorbent metering and delivery system. The system is complex, the reliability is low, the equipment investment cost is too high, and the economy is poor. The adsorbent metering and delivery system is used in one standby mode and shared by multiple spray guns, which can greatly improve the reliability and economy of the system, but it is necessary to develop special feeding and distribution devices to ensure the uniformity of the adsorbent flow of dozens of spray guns. Summary of the invention

[0006] The object of the present invention is to provide an adsorbent feeding and dispensing device, in particular a dry powder SO 3 Adsorbent feeding and distribution device.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] An adsorbent feeding and distributing device comprises a feeding unit and a mixing and distributing unit connected to the feeding unit, wherein:

[0009] The feeding unit comprises a high-speed airflow supply component, an adsorbent supply component, and an ejector connected to the high-speed airflow supply component and the adsorbent supply component, and the ejector is connected to the mixing and distributing unit;

[0010] The mixing and distributing unit comprises a shell, a feeding spray gun arranged in the shell, and a plurality of distribution branches arranged on the top of the shell, and the bottom of the shell has a dilution air inlet; the feeding spray gun extends in the up and down direction of the shell, the inlet of the feeding spray gun is located at the top, the outlet of the feeding spray gun is located at the bottom, and the injector is connected to the inlet of the feeding spray gun.

[0011] Preferably, the mixing and distributing unit further comprises a spray gun pipe seat and a dispersion plate, wherein the spray gun pipe seat is connected to the shell, and the feeding spray gun is connected inside the spray gun pipe seat; the dispersion plate is connected to the bottom of the spray gun pipe seat through a connecting rod, and the dispersion plate is 10-15 mm opposite to the outlet of the feeding spray gun.

[0012] Further preferably, the inner diameter of the feeding spray gun is 50-80 mm and the length is 1.5-2.0 m; the inner diameter of the spray gun pipe seat is 100-120 mm.

[0013] Preferably, the mixing and distributing unit further comprises a deviation-correcting bucket connected to the outlet of the feeding spray gun, and the inlet diameter of the deviation-correcting bucket is larger than the outlet diameter thereof.

[0014] Preferably, the shell has a circular pipe section at its lower part and a conical pipe section at its upper part, the outlet of the feeding spray gun is located at the circular pipe section, and the distribution branch pipe is located at the upper part of the conical pipe section.

[0015] Further preferably, the inner diameter of the circular tube section is 350-450 mm and the length is 1.5-2.5 m; the inner diameter of the top of the conical section is 800-1200 mm, the lower cone angle is 40-70°, and the upper cone angle is 140-160°.

[0016] Preferably, the distribution branch pipes are evenly distributed on the top of the shell, and the axes of the distribution branch pipes are perpendicular to the center line of the shell.

[0017] Preferably, the inner diameter of the distribution branch pipe is 40-60 mm.

[0018] Preferably, the high-speed airflow supply assembly includes a blower connected to the ejector and a check valve, and the check valve is arranged on a pipeline connecting the blower and the ejector.

[0019] Preferably, the adsorbent supply assembly comprises a silo, a feeder connected to the silo, and a rotary valve, the feeder is connected to the ejector, and the rotary valve is arranged on a pipeline connecting the feeder and the ejector.

[0020] Preferably, the feeder is a screw feeder.

[0021] Preferably, the injector is a venturi injector.

[0022] Preferably, the feeding units are provided in plurality, and the plurality of feeding units are arranged in parallel.

[0023] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] The present invention can meet the requirements of large-scale coal-fired power station boiler alkaline dry powder injection to remove SO 3 The system requirements improve system reliability and economy and improve the uniformity of distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 is a schematic diagram of this embodiment;

[0026] Attached Figure 2 is a three-dimensional diagram of the mixing and distributing unit in this embodiment;

[0027] Attached Figure 3 is a side view of the mixing and distributing unit in this embodiment;

[0028] Attached Figure 4 It is a top view of the mixing and distributing unit in this embodiment.

[0029] In the above attached figure:

[0030] 10. Blower; 11. Check valve; 12. Silo; 13. Feeder; 14. Rotary valve; 15. Ejector; 16. Y-type tee; 2. Mixing and distributing unit; 20. Shell; 200. Circular pipe section; 201. Conical pipe section; 21. Spray gun pipe seat; 22. Feeding spray gun; 23. Distribution branch pipe; 24. Correction bucket; 25. Dispersing disk; 26. Connecting rod. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1 An adsorbent feeding and distribution device shown includes a feeding unit and a mixing and distribution unit 2 connected to the feeding unit. The feeding unit and the mixing and distribution unit 2 are described in detail below.

[0035] The feeding unit includes a high-speed airflow supply component, an adsorbent supply component, and an ejector 15 connected to the high-speed airflow supply component and the adsorbent supply component. The ejector 15 is connected to the mixing and distributing unit 2. In this embodiment:

[0036] The high-speed airflow supply assembly includes a high-pressure blower 10 connected to an ejector 15, a check valve 11, and the check valve 11 is arranged on the pipeline connecting the blower 10 and the ejector 15; the adsorbent supply assembly includes a silo 12, a feeder 13 connected to the silo 12, and a rotary valve 14. The feeder 13 is a spiral feeder and is connected to the ejector 15. The rotary valve 14 is arranged on the pipeline connecting the feeder 13 and the ejector 15. The ejector 15 is a venturi ejector.

[0037] Multiple feeding units can be provided as needed, and multiple feeding units are arranged in parallel. The figure takes two as an example, one for backup and one for use, to improve the reliability of the system. The injectors 15 of the two feeding units are connected to the mixing and distribution unit 2 through the Y-type tee 16.

[0038] like Figure 2-4 As shown: the mixing and distributing unit 2 adopts an axisymmetric structure design, which includes a housing 20, a spray gun pipe seat 21 disposed in the housing 20, a feed spray gun 22 connected to the spray gun pipe seat 21, and a plurality of distribution branches 23 disposed on the top of the housing 20, that is, the housing 20, the spray gun pipe seat 21 and the feed spray gun 22 are coaxially arranged. Specifically:

[0039] The bottom of the housing 20 has a dilution air inlet. The housing 20 has a circular tube section 200 located at the lower part thereof and a conical tube section 201 located at the upper part thereof. In this embodiment: the inner diameter of the circular tube section 200 is 350-450 mm and the length is 1.5-2.5 m; the inner diameter of the top of the conical section 201 is 800-1200 mm, the lower cone angle is 40-70°, and the upper cone angle is 140-160°.

[0040] The spray gun pipe seat 21 and the feed spray gun 22 extend in the up-down direction of the shell 20. The spray gun pipe seat 21 and the feed spray gun 22 are connected by flanges to facilitate the inspection, maintenance and replacement of the feed spray gun. The inlet of the feed spray gun 22 is located at the top, the outlet of the feed spray gun 22 is located at the bottom, the outlet of the feed spray gun 22 is located at the circular pipe section 200, and the injector 15 is connected to the inlet of the feed spray gun 22. In this embodiment: the inner diameter of the spray gun pipe seat 21 is 100-120 mm; the inner diameter of the feed spray gun is 50-80 mm, and the length is 1.5-2.0 m.

[0041] The mixing and distributing unit 2 also includes a deviation correction bucket 24 and a dispersion plate 25. The deviation correction bucket 24 is connected to the outlet of the feed spray gun 22, and the inlet diameter of the deviation correction bucket 24 is larger than the outlet diameter, and is in a funnel-like shape. The dispersion plate 25 is connected to the bottom of the spray gun pipe seat 21 through a connecting rod 26 (three round steel bars in the figure), and the dispersion plate is 10-15 mm opposite to the outlet of the feed spray gun.

[0042] The distribution branch pipes 23 are evenly distributed on the top of the shell 20, the upper part of the tapered pipe section 201, and the axis of the distribution branch pipes 23 is perpendicular to the center line of the shell 20. In this embodiment: the inner diameter of the distribution branch pipes 23 is 40-60 mm.

[0043] The working process of this embodiment is described in detail below:

[0044] When the blower 10 is working, the high-pressure and high-speed airflow enters the ejector 15 through the check valve 11, and a negative pressure is formed at the feeding port at the top of the ejector 15, sucking the dry powder adsorbent falling from the upper rotary valve 14 into the ejector 15. The high-speed airflow coming out of the ejector 15 carries the dry powder adsorbent through the Y-type tee 16 and enters the mixing and distributing unit 2. The feeding amount of the dry powder adsorbent is controlled by the speed of the feeder 13. The check valve 11 and the rotary valve 14 are used to prevent the airflow and dry powder adsorbent in the pipeline from being blown back to the blower 10 and the feeder 13. The dilution air enters from the bottom of the mixing and distributing unit 2, mixes with the airflow carrying the dry powder adsorbent, and then enters each adsorbent spray gun downstream from the distribution branch pipe 23 at the top.

[0045] In the mixing and distribution unit 2: the high-speed airflow carrying the dry powder adsorbent enters the feeding spray gun 22 from the top, the airflow is fully developed in the feeding spray gun 22, the adsorbent is rectified by the correction bucket 24, and the problem of dry powder adhering to the wall is eliminated. After the high-speed airflow carrying the dry powder adsorbent comes out of the feeding spray gun 22, it hits the dispersion disk 25 and diffuses to the surroundings, and is preliminarily mixed with the dilution air flowing from bottom to top in the circular pipe section 200 at the bottom of the shell 20. After the dilution air carries the dry powder adsorbent into the top conical pipe section 201, the flow rate is reduced, and a spray effect is formed under the action of the jet, further strengthening the mixing of the dilution air and the dry powder adsorbent. After the adsorbent is evenly mixed in the top conical pipe section 201, it enters the downstream adsorbent spray guns through the distribution branches 23 around.

[0046] Example:

[0047] The adsorbent feeding and distribution device with the following parameters was selected: the inner diameter of the feeding spray gun 22 was 60 mm and the length was 1.7 m, the inner diameter of the spray gun pipe seat 21 was 105 mm, the dispersion plate 25 was 15 mm away from the outlet of the feeding spray gun 22, the inner diameter of the circular pipe section 200 was 350 mm and the length was 1.7 m, the inner diameter of the top of the conical pipe section 201 was 1.0 m, the lower cone angle was 60°, the upper cone angle was 160°, and 20 distribution branch pipes 23 with an inner diameter of 60 mm were set at the outlet.

[0048] Used for alkali dry powder spraying to remove SO 3Demonstration application of the device. The physical model test used calcium oxide dry powder with a particle size of about 325 mesh as the adsorbent, and the feeding time was 30 minutes. The test results are shown in Table 1. The average adsorbent dose of 20 branch pipes was 340g, the maximum negative deviation was -11%, the maximum positive deviation was 8%, and the relative standard deviation was 5.5%.

[0049] Table 1: Weight of adsorbent in the outlet branch of the dry powder mixing and distribution device (g).

[0050] Branch 1 Branch 2 Branch 3 Branch 4 Branch 5 313 356 333 324 329 Branch 6 Branch 7 Branch 8 Branch 9 Branch 10 311 337 342 368 304 Branch 11 Branch 12 Branch 13 Branch 14 Branch 15 321 339 342 357 342 Branch pipe 16 Branch 17 Branch pipe 18 Branch 19 Branch pipe 20 350 352 355 369 359

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An adsorbent feeding and dispensing device, characterized in that: It comprises a feeding unit and a mixing and distributing unit connected with the feeding unit, wherein: The feeding unit comprises a high-speed airflow supply component, an adsorbent supply component, and an ejector connected to the high-speed airflow supply component and the adsorbent supply component, and the ejector is connected to the mixing and distributing unit; The mixing and distributing unit comprises a shell, a feeding spray gun arranged in the shell, a plurality of distribution branches arranged on the top of the shell, a spray gun pipe seat, a dispersion plate, and a correction bucket connected to the outlet of the feeding spray gun, and the bottom of the shell has a dilution air inlet; the feeding spray gun extends in the up and down directions of the shell, the inlet of the feeding spray gun is located at the top, the outlet of the feeding spray gun is located at the bottom, the injector is connected to the inlet of the feeding spray gun, the shell has a circular pipe section located at the lower part and a conical pipe section located at the upper part, the outlet of the feeding spray gun is located at the circular pipe section; the distribution branch is located at the upper part of the conical pipe section; the spray gun pipe seat is connected to the shell, and the feeding spray gun is connected inside the spray gun pipe seat; the dispersion plate is connected to the bottom of the spray gun pipe seat through a connecting rod, and the dispersion plate is 10-15 mm opposite to the outlet of the feeding spray gun; the inlet diameter of the correction bucket is larger than the outlet diameter.

2. The adsorbent feeding and dispensing device according to claim 1, characterized in that: The distribution branch pipes are evenly distributed on the top of the shell, and the axes of the distribution branch pipes are perpendicular to the center line of the shell.

3. The adsorbent feeding and dispensing device according to claim 1, characterized in that: The high-speed airflow supply component comprises a blower connected to the ejector and a check valve, and the check valve is arranged on a pipeline connecting the blower and the ejector.

4. The adsorbent feeding and dispensing device according to claim 1, characterized in that: The adsorbent supply assembly comprises a silo, a feeder connected to the silo, and a rotary valve. The feeder is connected to the ejector, and the rotary valve is arranged on a pipeline connecting the feeder and the ejector.

5. The adsorbent feeding and dispensing device according to claim 4, characterized in that: The feeder is a screw feeder.

6. The adsorbent feeding and dispensing device according to claim 1, characterized in that: The ejector is a venturi ejector.

7. The adsorbent feeding and dispensing device according to claim 1, characterized in that: There are multiple feeding units, and the multiple feeding units are arranged in parallel.

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