Separating device for residual catalyst and lining fragments in methanol-to-olefin reactor
By installing a combination of a screen filter and a steam ejector in the methanol to olefins reactor, the lining debris blockage problem was solved, the catalyst and lining debris were effectively separated and cleaned, and smooth unloading of the catalyst tank was ensured.
Patent Information
- Application Number
- CN202422841697.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-21
AI Technical Summary
In methanol-to-olefins reactors, wear-resistant lining debris can easily clog catalyst unloading pipes after mixing with the catalyst, making cleaning difficult and affecting the smooth discharge of the catalyst tank.
A screen filter is installed between the fluidized bed reactor and the catalyst tank. A reinforced screen is used to intercept large-sized lining fragments, and a negative pressure environment is provided by a steam ejector to separate the catalyst and lining fragments. The lining fragments are then dropped to the bottom of the screen by gravity for cleaning.
This effectively reduces the accumulation of blocky lining material inside the catalyst tank, ensures smooth catalyst discharge, and improves the catalyst cleaning effect inside the reactor.
Smart Images
Figure CN223474977U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of methanol-to-olefins (MTO) technology, specifically relating to a device for pre-separating residual catalyst and lining debris inside a methanol-to-olefins reactor. Background Art
[0002] Methanol-to-olefins (MTO) is a widely used process for producing ethylene and propylene, and it is a core technology for developing the production of ethylene, propylene, and other products from non-petroleum resources. MTO uses methanol as a feedstock, and in a fast circulating fluidized bed reactor, methanol reacts with the active sites of the catalyst to generate reaction gases containing ethylene and propylene as target products.
[0003] The MTO fluidized bed reactor is equipped with a wear-resistant lining. During start-up and shutdown, temperature changes can cause the lining to detach. This detached lining mixes with the catalyst inside the reactor. The MTO catalyst particle size typically ranges from 20 to 100 micrometers, while the detached lining is generally in the form of flat, square fragments, approximately 1-5 mm thick with square sides of 8-25 mm. Over time, this accumulation of lining fragments increases the risk of clogging the catalyst circulation pipes in both reactors. Therefore, thorough cleaning is necessary during shutdown. Currently, a steam ejector is used to create a negative pressure environment in the catalyst unloading pipe. A mobile hose is then manually operated to enter the reactor and open the catalyst unloading pipe valve. The negative pressure provided by the steam ejector forces the mixture from inside the reactor through the catalyst unloading pipe to the waste catalyst tank. However, this process is highly susceptible to clogging due to the size of the detached lining fragments, making it extremely easy to clog the inlet pipe. Furthermore, under negative pressure, timely cleaning of the blockage at the pipe opening is also difficult. Summary of the Invention
[0004] The purpose of this invention is to provide a device for separating residual catalyst and lining fragments in a methanol-to-olefins reactor, which effectively improves the cleaning of the catalyst inside the reactor, reduces the accumulation of blocky lining in the catalyst tank, and thus prevents the catalyst tank from being obstructed.
[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:
[0006] A device for separating residual catalyst and lining debris in a methanol-to-olefins reactor includes a catalyst tank. The device is characterized by a screen filter installed between a fluidized bed reactor and the catalyst tank. The screen filter contains a reinforced filter screen. A connecting hose is installed at the bottom of the screen filter, and an isolation valve is installed at the top. The connecting hose is connected to the outlet of the fluidized bed reactor, and the screen filter is connected to the catalyst tank via the isolation valve.
[0007] Furthermore, the filter screen includes a reinforced filter screen with a pore size range of 2-10 mesh. Small-diameter catalyst particles can pass through the reinforced filter screen, while larger-sized lining and skin fragments are intercepted by the filter screen.
[0008] Furthermore, the catalyst tank is connected to a steam injector, which provides a negative pressure environment for the catalyst tank and catalyst pipeline.
[0009] Furthermore, the isolation valve is a ball valve to control the activation and deactivation of the screen filter.
[0010] Furthermore, the connecting hose is a portable hose that draws residual catalyst and lining debris from inside the reactor into the filter screen.
[0011] Furthermore, an enhanced filter screen is provided on the upper part of the filter screen.
[0012] Furthermore, the reinforced filter screen is a porous planar type, with its edges fixedly welded to the filter screen, and a reinforcing support is added at the center of the filter screen and connected to the top of the filter.
[0013] Furthermore, a sealing cap is provided at the bottom of the filter screen, preferably a snap-on sealing cap.
[0014] According to the device of this utility model, the connecting hose draws the residual catalyst and lining fragments inside the fluidized bed reactor into the filter screen. After passing through the reinforced filter screen, the catalyst passes through the isolation valve from the top and then enters the original vacuum collection pipeline into the catalyst tank. The blocky lining is filtered and adsorbed on its surface by the reinforced filter screen. The filter screen is shut down by closing the isolation valve. The lining on the surface of the reinforced filter screen falls off to the bottom of the filter screen under the action of gravity. The quick-opening snap-on sealing cover is opened for cleaning. After removing the bottom lining, the device can be reused.
[0015] Beneficial effects: This utility model device can effectively improve the catalyst cleaning effect inside the reactor, reduce the accumulation of blocky linings in the catalyst tank through the vacuum collection pipe, and thus prevent the catalyst tank from being obstructed. Attached Figure Description
[0016] Figure 1 A schematic diagram of the structure of the separation device for residual catalyst and lining fragments in the methanol-to-olefins reactor of this utility model.
[0017] 1-Filter screen, 2-Isolation valve, 3-Portable hose, 4-Reinforced filter screen, 5-Snap-on sealing cap, 6-Catalyst tank, 7-Steam injector. DETAILED DESCRIPTION
[0018] The specific embodiments of this utility model will be described in detail below. However, it should be noted that the scope of protection of this utility model is not limited by these specific embodiments, but is determined by the claims.
[0019] like Figure 1 As shown, the separation device for residual catalyst and lining debris inside a methanol-to-olefins reactor includes a catalyst tank 6 connected to a steam injector 7. A filter screen 1 is installed between the fluidized bed reactor and the catalyst tank 6. The filter screen 1 includes a reinforced filter screen 4, a quick-opening snap-on sealing cap 5, an isolation valve 2, and a portable hose 3. The portable hose 3 draws residual catalyst and lining debris from inside the fluidized bed reactor into the filter screen 1. The catalyst passes through the reinforced filter screen 4 and the isolation valve 2 before entering the catalyst pipeline. The steam injector 7 provides negative pressure to the catalyst tank 6. The blocky lining is filtered and adsorbed on the surface by the reinforced filter screen 4. The isolation valve 2 is closed to stop the filter screen 1 from being used. The lining adsorbed on the surface of the reinforced filter screen 4 falls off to the bottom of the filter screen 1 under gravity. The quick-opening snap-on sealing cap 5 is opened to remove the bottom lining, and the filter is put back into use.
[0020] The filter screen 1 is added at the inlet of the original vacuum reagent collection process. A reinforced filter screen 4 is installed on the upper part of the filter screen 1. The reinforced filter screen 4 is a porous planar type with a pore size ranging from 2 to 10 mesh. The edges are fixedly welded to the filter. A reinforcing support is added to the center of the filter screen and connected to the top of the filter.
[0021] Isolation valve 2 controls the activation and deactivation of the filter ball valve. The portable hose 3 is manually moved so that the nozzle can be submerged inside the reactor to draw in the residual catalyst and lining debris, which is then drawn into the filter screen 1.
Claims
1. A device for separating residual catalyst and lining debris in a methanol-to-olefins reactor, comprising a catalyst tank (6), characterized in that, A filter screen (1) is installed between the fluidized bed reactor and the catalyst tank (6). The filter screen (1) contains a reinforced filter screen (4). A connecting hose (3) is installed at the bottom of the filter screen (1) and an isolation valve (2) is installed at the top. The connecting hose (3) is connected to the outlet of the fluidized bed reactor, and the filter screen (1) is connected to the catalyst tank (6) via the isolation valve (2).
2. The separation device for residual catalyst and lining debris in a methanol-to-olefins reactor according to claim 1, characterized in that, The reinforced filter (4) has a pore size range of 2-10 mesh.
3. The separation device for residual catalyst and lining debris in a methanol-to-olefins reactor according to claim 1, characterized in that, The catalyst tank (6) is connected to the steam injector (7).
4. The separation device for residual catalyst and lining debris in a methanol-to-olefins reactor according to claim 1, characterized in that, The reinforced filter (4) is located on the upper part of the filter (1).
5. The separation device for residual catalyst and lining debris in a methanol-to-olefins reactor according to claim 1, characterized in that, The reinforced filter (4) is a porous planar type, with its edges fixedly welded to the filter screen (1). A reinforcing support is added to the center of the filter screen and connected to the top of the filter screen (1).
6. The separation device for residual catalyst and lining debris in a methanol-to-olefins reactor according to claim 1, characterized in that, The bottom of the filter screen (1) is provided with a sealing cap (5).