Coking inhibitor feeding device for waste heat boiler

Abstract

The utility model belongs to the field of waste heat boiler coking treatment, and discloses a waste heat boiler coking inhibitor adding device which comprises a stock bin, a screw feeder, a discharging hopper, a Venturi ejector, an air source pipe, a conveying pipe and a nozzle arranged on a waste heat boiler. A discharging port of the discharging hopper is connected with a negative pressure taking port of the venturi ejector, the air source pipe is connected with an air inlet of the venturi ejector, one end of the material conveying pipe is connected with a discharging port of the venturi ejector, and the other end of the material conveying pipe is connected with the nozzle. A humidity sensor is arranged in the stock bin, a spiral pipe of the spiral feeder is provided with a heating section, a spiral shaft corresponding to the heating section is an optical shaft, and a plurality of shoveling plates which are spirally distributed are arranged on the optical shaft. The heating section of the screw feeder is used for heating and drying the coking inhibitor, the coking inhibitor is pushed into the discharging hopper through the screw shaft, the coking inhibitor is conveyed into the waste heat boiler under the action of the Venturi ejector, and blocking of the conveying pipe is effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the field of waste heat boiler coking treatment, in particular to a waste heat boiler coking inhibitor dosing device. Background Art

[0002] Since the combustion of waste heat boilers is prone to coking, it is usually necessary to add coking inhibitors to the waste heat boiler. At present, the device for adding coking inhibitors to waste heat boilers mainly adopts pneumatic conveying devices, such as: Chinese patent application with application number CN202222456970.5 discloses a boiler coking inhibitor dosing device, which drives the driving pulley to rotate through the feeding motor, and then drives the transmission pulley to rotate through the connecting belt, so that the feeding shaft can be rotated, thereby conveying the coking inhibitor in the material box through the feeding blade, which can effectively control the feeding speed of the coking inhibitor; through the action of the feeder, the coking inhibitor is transported from the material box to the acceleration chamber, and enters the air duct along the acceleration chamber. Under the action of the pressure transmitter in the air duct, the coking inhibitor can be added to the boiler along the conveying pipe. However, this dosing device has the following defects:

[0003] Since the coking inhibitor is a powder, it easily absorbs moisture in the air and becomes agglomerated or compacted, which can easily clog the feed pipe during transportation, thereby affecting the decoking effect of the boiler.

[0004] Based on this, the present application provides a waste heat boiler coking inhibitor dosing device that can dehumidify the coking inhibitor to prevent the feed pipe or the lower hopper from being blocked. Utility Model Content

[0005] The utility model aims to solve the problem that a coking inhibitor dosing device is prone to clogging the feed pipe due to moisture in the powder. To this end, the utility model provides a waste heat boiler coking inhibitor dosing device that can dehumidify the coking inhibitor to prevent clogging of the feed pipe or the lower hopper.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] Provided is a device for dosing coking inhibitors for a waste heat boiler, comprising a silo, a screw feeder, a lower hopper, a venturi ejector, an air source pipe, a delivery pipe, and a nozzle arranged on the waste heat boiler. The feed port and the discharge port of the screw feeder are respectively equipped with the silo and the lower hopper, the discharge port of the lower hopper is connected to the negative pressure port of the venturi ejector, the air source pipe is connected to the air inlet of the venturi ejector, one end of the delivery pipe is connected to the discharge port of the venturi ejector, and the other end is connected to the nozzle; a humidity sensor is provided in the silo, and the spiral pipe of the screw feeder is provided with a heating section, the spiral axis corresponding to the heating section is set as an optical axis, and a plurality of spirally distributed copying plates are provided on the optical axis.

[0008] In a preferred embodiment, the screw shaft of the screw feeder passes through the lower hopper and is rotatably connected to a bearing seat provided on the side wall of the lower hopper. A U-shaped filter screen is provided below the screw shaft in the lower hopper, and a plurality of grinding rollers are provided on the screw shaft.

[0009] In a preferred embodiment, the heating section includes a shell, a spiral heating tube arranged on the outer wall of the shell, and a thermal insulation layer arranged outside the spiral heating tube. Both ends of the shell are connected to the spiral tube by flanges.

[0010] In a preferred embodiment, the spiral heating tube is connected to a temperature controller, and both the temperature controller and the humidity sensor are electrically connected to a PLC controller.

[0011] In a preferred embodiment, an electric valve is provided on the gas source pipe for adjusting the size of the gas source.

[0012] In a preferred embodiment, the top opening of the lower hopper is provided with a cover plate, the cover plate is made of a transparent material, and a steam exhaust port is provided on the cover plate.

[0013] In a preferred embodiment, the screw feeder is a frequency-controlled screw feeder, and the feeding speed is adjusted by a frequency converter.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The utility model detects the humidity of the coking inhibitor by arranging a humidity sensor in the silo. When it is detected that the humidity reaches a critical value, the heating section of the screw feeder is controlled to heat and dry it. While the screw feeder is running, the scraping plate of the heating section continuously picks up the coking inhibitor and breaks it up to make the heating more uniform. The dried coking inhibitor enters the lower hopper under the push of the spiral shaft and is sent to the waste heat boiler through the action of the Venturi ejector, which effectively solves the problem that the coking inhibitor is easily blocked in the feed pipe due to moisture in the powder.

[0016] Second, the filter screen provided in the lower hopper and the grinding roller provided on the spiral shaft can further grind the coking inhibitor to prevent the coking inhibitor from still having the problem of agglomeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 This is a structural diagram of a coking inhibitor dosing device for a waste heat boiler provided by the utility model;

[0019] Figure 2 yes Figure 1 A partial enlarged view of point H is provided;

[0020] Figure 3 It is a side partial sectional view of the lower hopper provided by the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0022] 1—Bindle, 2—Screw feeder, 2.1—Spiral tube, 2.2—Heating section, 2.2.1—Shell, 2.2.2—Spiral heating tube, 2.2.3—Thermal insulation layer, 2.3—Screw shaft, 2.4—Scraper plate, 2.5—Grinding roller, 3—Lower hopper, 3.1—Cover, 3.1.0—Exhaust port, 4—Venturi ejector, 5—Air source pipe, 6—Feed pipe, 7—Nozzle, 8—Electric valve, 9—Humidity sensor, 10—Filter. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention; the terms "install", "connect", and "connect" 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 an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0027] Example 1

[0028] This embodiment provides a device for adding coking inhibitor to a waste heat boiler, as shown in the attached Figure 1 As shown, it includes a silo 1, a screw feeder 2, a lower hopper 3, a venturi ejector 4, an air source pipe 5, a delivery pipe 6, and a nozzle 7 installed on the waste heat boiler. The specific connection relationship is: the silo 1 is installed at the feed port of the screw feeder 2, the lower hopper 3 is installed at the discharge port of the screw feeder 2, the discharge port of the lower hopper 3 is connected to the negative pressure port of the venturi ejector 4, the air source pipe 5 is connected to the air inlet of the venturi ejector 4, and the delivery pipe 6 is connected to the discharge port of the venturi ejector 4 at one end and the nozzle 7 at the other end. Among them, the air source pipe 5 is connected to the compressed air pipeline, and the air source pipe 5 is provided with an electric valve 8 with adjustable opening, which can adjust the size of the air source.

[0029] To address the problem of coke inhibitors easily clogging the feed pipe due to moisture, this embodiment provides a humidity sensor 9 within the silo 1 to detect the humidity of the coke inhibitor within the silo. Furthermore, a heating section 2.2 is provided within the spiral tube 2.1 of the screw feeder 2. The spiral axis 2.3 corresponding to the heating section 2.2 serves as an optical axis, and a plurality of helically distributed scrapers 2.4 are disposed on the optical axis. This design achieves the following: when the humidity sensor detects that the coke inhibitor's humidity has reached a set value, indicating that the surface needs to be dried, the heating section of the screw feeder is controlled to heat and dry the coke inhibitor. While the screw feeder is operating, the scrapers in the heating section continuously scoop up the coke inhibitor, which not only breaks up any clumped coke inhibitor but also improves the drying effect and efficiency.

[0030] Preferably, as attached Figure 2 As shown, the heating section 2.2 includes a shell 2.2.1, a spiral heating tube 2.2.2 arranged on the outer wall of the shell and a thermal insulation layer 2.2.3 arranged outside the spiral heating tube. Both ends of the shell 2.2.1 are connected to the spiral tube 2.1 by flanges.

[0031] Preferably, the spiral heating tube 2.2.2 is connected to a temperature controller (not shown in the figure), and the temperature controller and humidity sensor 9 are both electrically connected to a PLC controller (not shown in the figure), and automatic control is achieved using the PLC controller.

[0032] Preferably, the screw feeder 2 is a frequency-controlled screw feeder, and the feeding speed is adjusted by a frequency converter.

[0033] Preferably, the silo 1 is preferably a silo with an agitator, which can effectively prevent the initial bridging phenomenon of the coking inhibitor.

[0034] Preferably, the open top of the lower hopper 3 is provided with a cover plate 3.1, which is made of a transparent material, specifically acrylic, and allows for real-time observation of the state inside the lower hopper. The cover plate 3.1 is also provided with a steam exhaust port 3.1.0 for exhausting water vapor generated by drying the coking inhibitor.

[0035] Example 2

[0036] Based on the first embodiment, as shown in the attached Figure 1 and 3As shown, the screw shaft 2.3 of the screw feeder 2 passes through the lower hopper 3 and is rotatably connected to a bearing seat located on the side wall of the lower hopper. A U-shaped filter screen 10 is installed below the screw shaft 2.3 within the lower hopper 3, and multiple grinding rollers 2.5 are installed on the screw shaft 2.3. This embodiment, by providing the filter screen within the lower hopper and the grinding rollers on the screw shaft, further grinds the coking inhibitor, preventing it from clumping and ensuring that the coking inhibitor remains in a loose state.

[0037] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, 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 device for adding coking inhibitor to a waste heat boiler, Features: It includes a silo, a screw feeder, a lower hopper, a venturi ejector, an air source pipe and a conveying pipe, and a nozzle arranged on the waste heat boiler. The feed port and the discharge port of the screw feeder are respectively equipped with a silo and a lower hopper. The discharge port of the lower hopper is connected to the negative pressure outlet of the venturi ejector, the air source pipe is connected to the air inlet of the venturi ejector, one end of the conveying pipe is connected to the discharge port of the venturi ejector, and the other end is connected to the nozzle; A humidity sensor is arranged in the silo, a heating section is arranged on the spiral tube of the spiral feeder, a spiral axis corresponding to the heating section is arranged as an optical axis, and a plurality of copying plates distributed in a spiral are arranged on the optical axis.

2. The waste heat boiler coking inhibitor dosing device according to claim 1, Features: The screw shaft of the screw feeder passes through the lower hopper and is rotatably connected to a bearing seat arranged on the side wall of the lower hopper. A U-shaped filter screen is arranged below the screw shaft in the lower hopper, and a plurality of grinding rollers are arranged on the screw shaft.

3. The waste heat boiler coking inhibitor dosing device according to claim 1, Features: The heating section comprises a shell, a spiral heating tube arranged on the outer wall of the shell and a heat preservation and heat insulation layer arranged outside the spiral heating tube. Both ends of the shell are connected to the spiral tube by flanges.

4. The waste heat boiler coking inhibitor dosing device according to claim 3, Features: The spiral heating tube is connected to a temperature controller, and the temperature controller and the humidity sensor are both electrically connected to a PLC controller.

5. The waste heat boiler coking inhibitor dosing device according to claim 1, Features: The gas source pipe is provided with an electric valve for adjusting the size of the gas source.

6. The waste heat boiler coking inhibitor dosing device according to claim 1, Features: The top opening of the lower hopper is provided with a cover plate, the cover plate is made of a transparent material, and a steam exhaust port is provided on the cover plate.

7. The waste heat boiler coking inhibitor dosing device according to claim 1, Features: The screw feeder is a frequency-converting screw feeder, and the feeding speed is adjusted by a frequency converter.

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