A bottom corrosion protection device for a low-temperature waste heat recovery steam ejector

Abstract

This application relates to the field of steam ejector technology, specifically to a bottom anti-corrosion device for a low-temperature waste heat recovery steam ejector. The device includes a silicon carbide lining located at the bottom of the steam ejector, a baffle plate positioned above the silicon carbide lining, and an acid discharge mechanism. The acid discharge mechanism includes a collection tank and an acid discharge pipe connected to the acid discharge port of the steam ejector. The acid discharge pipe is vertical, with its bottom end extending into the collection tank. A drain pipe is located at the bottom of the collection tank, and an overflow pipe is located at the top. A cleaning assembly for cleaning the inside of the collection tank is provided. By installing a baffle plate above the silicon carbide lining, the gap between the upper end of the silicon carbide lining and the inner wall of the steam ejector is blocked, preventing condensed acid from seeping into the gap and causing corrosion to the bottom of the steam ejector.

Description

Technical Field

[0001] This application relates to the field of steam ejector technology, and more specifically, to a bottom anti-corrosion device for a low-temperature waste heat recovery steam ejector. Background Technology

[0002] In waste heat recovery systems for the acid production industry, absorption towers (specifically, functional absorption towers used in waste heat recovery scenarios) are core equipment that balances "tail gas purification" and "low-grade waste heat recovery." Their primary function is to address the pain point of not being able to directly recover waste heat from "medium- and low-temperature flue gas containing acidic pollutants" in the acid production process. Specifically, absorption towers remove acidic pollutants from flue gas, protecting subsequent waste heat recovery equipment, and transfer low-grade heat energy from the flue gas to the absorbent, thus capturing waste heat.

[0003] Currently, in high-concentration flue gas sulfuric acid production processes, steam ejectors are used to inject low-pressure steam before the flue gas enters the absorption tower. The mixing of steam and flue gas allows some of the sulfur trioxide in the flue gas to react prematurely to form sulfuric acid, thus reducing the absorption load on the subsequent absorption tower. However, in actual production, the mixing of steam and flue gas inevitably produces condensed acid. The traditional method of discharge involves installing two discharge valves on the bottom side of the steam ejector, which are opened periodically to allow the condensate to be recovered into a storage tank.

[0004] However, in actual use, in order to prevent the bottom of the steam ejector from being corroded by condensed acid, the existing technology often lays acid-resistant and heat-resistant silicon carbide bricks at the bottom of the ejector to extend its service life. However, in actual use, due to the difference in the coefficient of thermal expansion between the steam ejector and silicon carbide, gaps will be generated between the upper end of the silicon carbide bricks and the inner wall of the steam ejector. This allows condensed acid to seep in through the gaps, causing the bottom of the steam ejector to be corroded, thus affecting its use. Utility Model Content

[0005] The purpose of this application is to provide a bottom anti-corrosion device for a low-temperature waste heat recovery steam ejector to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A bottom anti-corrosion device for a low-temperature waste heat recovery steam ejector includes a silicon carbide lining disposed inside the steam ejector and located at the bottom, as well as a baffle plate disposed above the silicon carbide lining and an acid discharge mechanism.

[0008] The acid discharge mechanism includes a collection tank and an acid discharge pipe connected to the acid discharge port of the steam injector. The acid discharge pipe is vertical and its bottom end extends into the collection tank. A drain pipe is provided at the bottom of the collection tank, and an overflow pipe is provided at the top of the collection tank. A cleaning component for cleaning the inside of the collection tank is provided inside the collection tank.

[0009] Preferably, the cleaning assembly includes a first cleaning component for cleaning acid sludge on the bottom wall of the collection tank and a second cleaning component for cleaning acid sludge on the side wall of the collection tank.

[0010] Preferably, the first cleaning component includes a guide platform located at the bottom of the collection tank. The guide platform is frustum-shaped, and the connection port of the sewage pipe is matched with the guide platform. A rotatable scraper is provided on the side of the guide platform. The scraper rotates to guide the acid sludge on the side of the guide platform into the sewage pipe.

[0011] Preferably, a first motor is provided on the bottom wall of the collection tank, and a rotating shaft that passes through the guide platform is provided on the output shaft of the first motor, with one end of the scraper connected to the through end of the rotating shaft.

[0012] Preferably, the second cleaning component includes a mounting ring that can be lifted and lowered inside the collection tank. A spray pipe is provided on the lower side of the mounting ring along its circumference, and nozzles for spraying onto the inner wall of the collection tank are arranged on the outer side wall of the spray pipe.

[0013] Preferably, the inner sidewall of the mounting ring is provided with mounting parts opposite each other, and the collection tank is provided with a rotatable screw. The screw thread passes through one of the two mounting parts, and the other of the two mounting parts is provided with a guide rod that passes through the top of the collection tank. The rotation of the screw is used to drive the mounting ring to move up and down inside the collection tank.

[0014] Preferably, a second motor for driving the lead screw is provided at the top of the collection tank.

[0015] Preferably, the guide rod has a mounting hole that passes through the corresponding mounting part, and a water supply pipe for supplying water to the spray pipe passes through the mounting hole.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] 1. In this application, a baffle plate is provided above the silicon carbide liner to block the gap between the upper end of the silicon carbide liner and the inner wall of the steam ejector, so as to prevent condensed acid from seeping into the gap and causing corrosion to the bottom of the steam ejector.

[0018] 2. In this application, the cleaning component is designed to clean the acid sludge adhering to the inner wall of the collection tank when the condensed acid collected in the collection tank is drained, thereby ensuring the usability of the collection tank. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the bottom anti-corrosion device of a low-temperature waste heat recovery steam ejector according to this application.

[0020] Figure 2 This is a schematic diagram of the collection tank in this application.

[0021] Figure 3 This is a cross-sectional schematic diagram of the collection tank in this application.

[0022] Figure 4 This is one of the structural schematic diagrams of the second cleaning component in this application.

[0023] Figure 5 This is the second structural schematic diagram of the second cleaning component in this application.

[0024] The meanings of the labels in the diagram are as follows:

[0025] 110. Silicon carbide lining; 120. Baffle plate; 130. Collection tank; 140. Acid discharge pipe;

[0026] 201. Sewage pipe; 202. Support leg; 210. Guide rod; 220. Second motor; 230. Water supply pipe;

[0027] 310. Guide table; 320. Scraper; 330. First motor; 331. Rotating shaft; 340. Mounting ring; 350. Spray pipe;

[0028] 411. Nozzle; 412. Mounting part; 501. Threaded cylinder. Detailed Implementation

[0029] To further understand the content of this application, a detailed description of this application will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of this application.

[0030] The following is in conjunction with the appendix Figures 1-5 This embodiment will be described in further detail.

[0031] like Figure 1 As shown, the bottom anti-corrosion device of a low-temperature waste heat recovery steam ejector in this embodiment includes a silicon carbide lining 110 disposed inside the steam ejector and located at the bottom, as well as a baffle plate 120 disposed above the silicon carbide lining 110 and an acid discharge mechanism.

[0032] In actual use, the baffle plate 120 is arranged around the circumference of the steam ejector above the silicon carbide liner 110 to block the gap between the upper end of the silicon carbide liner 110 and the inner wall of the steam ejector, so as to prevent condensed acid from seeping into the gap and causing corrosion to the bottom of the steam ejector. Specifically, the baffle plate 120 is made of the same metal material as the steam ejector. The outer wall of the baffle plate 120 is fixed to the inside of the steam ejector by welding. In actual use, in order to better guide the dripping condensed acid into the silicon carbide liner 110, the cross section of the baffle plate 120 is inclined in this embodiment.

[0033] The acid discharge mechanism allows the condensed acid collected in the silicon carbide lining 110 to be discharged, ensuring the continuous operation of the steam ejector.

[0034] In this embodiment, the acid discharge mechanism includes a collection tank 130 and an acid discharge pipe 140 connected to the acid discharge port of the steam ejector. Specifically, the collection tank 130 is located below the steam ejector, and the acid discharge pipe 140 is vertically arranged, with its top end penetrating through the acid discharge port of the steam ejector and communicating with the inside of the silicon carbide lining 110, and its bottom end extending into the collection tank 130. In actual use, an acid discharge valve is provided on the acid discharge pipe 140. When the acid discharge valve is opened, the condensed acid collected in the silicon carbide lining 110 can enter the collection tank 130 for collection through the acid discharge pipe 140. A drain pipe 201 is provided at the bottom of the collection tank 130, and an overflow pipe (not shown in the figure) is provided at the top of the collection tank 130. A valve is also provided on the drain pipe 201. Therefore, in actual use, when the valve on the drain pipe 201 is closed, after a certain amount of condensed acid is collected in the collection tank 130, the excess condensed acid is discharged into the underground tank through the overflow pipe. Since the bottom end of the acid discharge pipe 140 extends into the collection tank 130, when the excess condensed acid in the collection tank 130 is discharged through the overflow pipe, the liquid level in the collection tank 130 can be stabilized better, preventing the flue gas in the steam ejector from overflowing from the acid discharge pipe 140. When it is necessary to clean the collection tank 130, the acid discharge valve is closed and the valve on the drain pipe 201 is opened, so that the condensed acid collected in the collection tank 130 can be discharged through the drain pipe 201. The collection tank 130 is equipped with a cleaning component for cleaning the collection tank 130.

[0035] In actual use, during the process of collecting condensed acid into the collection tank 130, acid sludge will settle at the bottom of the collection tank 130 and adhere to its side walls. Therefore, when the condensed acid in the collection tank 130 is discharged, the cleaning component is designed to clean the acid sludge in the collection tank 130 to ensure the usability of the collection tank 130.

[0036] Combination Figure 2 and Figure 3 As shown, in this embodiment, the cleaning assembly includes a first cleaning component for cleaning acid sludge on the bottom wall of the collection tank 130 and a second cleaning component for cleaning acid sludge on the side wall of the collection tank 130.

[0037] In this embodiment, by setting the first cleaning component and the second cleaning component, when the condensed acid in the collection tank 130 is drained, the first cleaning component can be used to clean the acid sludge on the bottom of the collection tank 130, and the second cleaning component can be used to clean the acid sludge on the side wall of the collection tank 130, thereby cleaning the acid sludge in the collection tank 130.

[0038] In this embodiment, the first cleaning component includes a guide platform 310 located at the bottom of the collection tank 130. The guide platform 310 is frustum-shaped, specifically, the diameter of the guide platform 310 gradually increases from top to bottom, and its bottom wall is fixedly connected to the bottom wall of the collection tank 130. This ensures that the outer surface of the guide platform 310 is inclined, enabling it to guide the acid sludge to the junction of the bottom wall of the collection tank 130 and the bottom wall of the guide platform 310. Wherein, as... Figure 3 As shown, the connection port of the sewage pipe 201 is matched with the guide platform 310. The side of the guide platform 310 is provided with a rotatable scraper 320. Therefore, the scraper 320 is rotated to scrape up the acid sludge on the side of the guide platform 310 and flow along the scraper 320 to the bottom of the collection tank 130. Thus, when the scraper 320 passes the sewage pipe 201, it guides the acid sludge into the sewage pipe 201.

[0039] In actual use, in order to realize the rotation of the scraper 320, in this embodiment, a first motor 330 is provided on the bottom wall of the collection tank 130, and a rotating shaft 331 that passes through the guide table 310 is provided on the output shaft of the first motor 330. One end of the scraper 320 is connected to the through end of the rotating shaft 331. Specifically, the rotating shaft 331 is rotatably installed between the guide table 310 and the bottom wall of the collection tank 130 through a bearing, and the output shaft of the first motor 330 is connected to the rotating shaft 331 through a reduction gearbox.

[0040] Specifically, in order to install the first motor 330 on the bottom wall of the collection tank 130, a support leg 202 is provided on the bottom wall of the collection tank 130 for supporting it.

[0041] Combination Figure 4 and Figure 5 As shown, in this embodiment, the second cleaning component includes a mounting ring 340 that can be lifted and lowered inside the collection tank 130. A spray pipe 350 is fixedly provided on the lower side of the mounting ring 340 along its circumference. Nozzles 411 for spraying onto the inner wall of the collection tank 130 are arranged on the outer side wall of the spray pipe 350.

[0042] In this embodiment, mounting portions 412 are provided opposite to each other on the inner sidewall of the mounting ring 340, and a rotatable lead screw 360 is provided inside the collection tank 130. The lead screw 360 is threaded through one of the two mounting portions 412, and a guide rod 210 is provided at the other of the two mounting portions 412, which passes through the top of the collection tank 130. The rotation of the lead screw 360 is used to drive the mounting ring 340 to move up and down inside the collection tank 130.

[0043] In this embodiment, a removable lid is provided at the top of the collection tank 130. Since the guide rod 210 slides through the lid and the lead screw 360 threaded through one of the two mounting parts 412, the mounting ring 340 and the spray pipe 350 are circumferentially restricted, preventing them from rotating circumferentially inside the collection tank 130. Therefore, the rotation of the lead screw 360 can drive the mounting ring 340 and the spray pipe 350 to rise and fall inside the collection tank 130, so that the water sprayed from the nozzle 411 can more thoroughly rinse the inner wall of the collection tank 130 to remove the acid sludge attached to the side wall. At the same time, when the rinsing wastewater flows out through the drain pipe 201, it can drive the acid sludge on the bottom wall of the collection tank 130 to be discharged. Therefore, the cleaning component can clean the acid sludge inside the collection tank 130.

[0044] In this embodiment, the lead screw 360 is rotatably mounted on the can lid via a bearing. To improve the strength of the threaded connection between the lead screw 360 and one of the two mounting parts 412, a threaded cylinder 501 threadedly connected to the lead screw 360 is fixedly provided on the upper side of the mounting part 412. The threaded cylinder 501 increases the distance of the threaded connection with the lead screw 360, thereby improving the connection strength between the two. Specifically, to realize the rotation of the lead screw 360, a second motor 220 for driving the lead screw 360 to rotate is provided at the top of the collection tank 130. Specifically, the second motor 220 is connected to the lead screw 360 through a reduction gearbox to realize the forward and reverse rotation of the lead screw 360 and realize the lifting and lowering of the mounting ring 340.

[0045] In this embodiment, in order to supply water to the spray pipe 350 so that the nozzle 411 can spray water for rinsing, the guide rod 210 has an installation hole that passes through the corresponding installation part 412. A water supply pipe 230 for supplying water to the spray pipe 350 is installed in the installation hole. The water supply pipe 230 is a flexible hose, one end of which can be connected to an existing water tank, and the other end passes through the installation hole and is connected to the spray pipe 350. The water tank is equipped with a water pump, which can pump water from the water tank into the spray pipe 350. At the same time, the water supply pipe 230 can rise and fall with the guide rod 210 to avoid interfering with the rising and falling of the installation ring 340.

[0046] In summary, the above description is only a preferred embodiment of this application. All equivalent changes and modifications made within the scope of this application should be covered by this application.

Claims

1. A bottom corrosion protection device for cryogenic waste heat recovery steam ejectors comprising a silicon carbide liner (110) located within the steam ejector at the bottom, characterized by: It also includes a baffle plate (120) located above the silicon carbide liner (110) and an acid discharge mechanism; The acid discharge mechanism includes a collection tank (130) and an acid discharge pipe (140) connected to the acid discharge port of the steam injector. The acid discharge pipe (140) is vertical and its bottom end extends into the collection tank (130). A drain pipe (201) is provided at the bottom of the collection tank (130), and an overflow pipe is provided at the top of the collection tank (130). A cleaning component for cleaning the inside of the collection tank (130) is provided inside the collection tank (130).

2. A bottom anti-pitting device for cryogenic waste heat recovery steam ejectors as claimed in claim 1, wherein: The cleaning assembly includes a first cleaning component for cleaning acid sludge on the bottom wall of the collection tank (130) and a second cleaning component for cleaning acid sludge on the side wall of the collection tank (130).

3. A bottom anti-pitting device for cryogenic waste heat recovery steam ejectors as claimed in claim 2, wherein: The first cleaning component includes a guide platform (310) located at the bottom of the collection tank (130). The guide platform (310) is frustum-shaped. The connection port of the sewage pipe (201) is matched with the guide platform (310). A rotatable scraper (320) is provided on the side of the guide platform (310). The scraper (320) rotates to guide the acid sludge on the side of the guide platform (310) into the sewage pipe (201).

4. A bottom anti-pitting device for cryogenic waste heat recovery steam ejectors as claimed in claim 3, wherein: A first motor (330) is provided on the bottom wall of the collection tank (130). A rotating shaft (331) that passes through the guide table (310) is provided on the output shaft of the first motor (330). One end of the scraper (320) is connected to the through end of the rotating shaft (331).

5. A bottom anti-pitting device for cryogenic waste heat recovery steam ejectors as claimed in claim 2, wherein: The second cleaning component includes a mounting ring (340) that can be lifted and lowered inside the collection tank (130). A spray pipe (350) is provided on the lower side of the mounting ring (340) along its circumference. Nozzles (411) for spraying onto the inner wall of the collection tank (130) are arranged on the outer side wall of the spray pipe (350).

6. A bottom anti-pitting device for cryogenic waste heat recovery steam ejectors as claimed in claim 5, wherein: The inner sidewall of the mounting ring (340) is provided with mounting parts (412) opposite each other. The collection tank (130) is provided with a rotatable screw (360). The screw (360) is threaded through one of the two mounting parts (412). The other of the two mounting parts (412) is provided with a guide rod (210) that passes through the top of the collection tank (130). The rotation of the screw (360) is used to drive the mounting ring (340) to rise and fall inside the collection tank (130).

7. A bottom anti-pitting device for cryogenic waste heat recovery steam ejectors as claimed in claim 6, wherein: A second motor (220) for driving the lead screw (360) to rotate is provided at the top of the collection tank (130).

8. A bottom anti-pitting device for cryogenic waste heat recovery steam ejectors as claimed in claim 6, wherein: The guide rod (210) has an installation hole that passes through the corresponding installation part (412), and a water supply pipe (230) for supplying water to the spray pipe (350) passes through the installation hole.

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