Fluidized bed slag discharge device

Abstract

The present invention relates to the field of fluidized bed equipment, and in particular to a fluidized bed deslagging device that realizes fluidized bed deslagging in a closed, online and continuous manner, thereby ensuring the continuous and stable operation of the fluidized bed, comprising a deslagging pipe composed of an initial section of a deslagging pipe, a middle section of a deslagging pipe and a final section of a deslagging pipe in sequence, a first deslagging valve being arranged between the initial section of the deslagging pipe and the middle section of the deslagging pipe, a second deslagging valve being arranged between the middle section of the deslagging pipe and the final section of the deslagging pipe, the initial section of the deslagging pipe being connected to a nitrogen purge pipe through a first nitrogen valve, an end of the middle section of the deslagging pipe close to the first deslagging valve being connected to a nitrogen purge pipe through a second nitrogen valve, an end of the middle section of the deslagging pipe close to the second deslagging valve being connected to a nitrogen purge pipe through a third nitrogen valve, comprising a slag pot, and the final section of the deslagging pipe being connected to the slag pot. The present invention is particularly suitable for deslagging in a fluidized bed.

Description

Technical Field

[0001] The invention relates to the field of fluidized bed equipment, in particular to a fluidized bed slag discharge device. Background Art

[0002] In the production process of fluidized bed reactor, the residue left after the reaction has an adverse effect on the fluidization state of the fluidized bed and needs to be discharged. Generally, the fluidized bed medium has the characteristics of high temperature and corrosiveness, so a closed and continuous slag discharge device must be used. For example, in the process of producing titanium tetrachloride in a fluidized bed, because HCl, TiCl 4 , Cl 2 The invention designs a closed, online and continuous slag discharge device based on the process of producing titanium tetrachloride in a fluidized bed, which ensures the continuous and stable operation of the fluidized bed and can significantly improve the production efficiency of the fluidized bed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a fluidized bed slag discharge device which can realize fluidized bed slag discharge in a closed, online and continuous manner, thereby ensuring continuous and stable operation of the fluidized bed.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a fluidized bed slag discharge device comprises a slag discharge pipe which is sequentially composed of an initial section of the slag discharge pipe, a middle section of the slag discharge pipe and a final section of the slag discharge pipe, a first slag discharge valve is arranged between the initial section of the slag discharge pipe and the middle section of the slag discharge pipe, a second slag discharge valve is arranged between the middle section of the slag discharge pipe and the final section of the slag discharge pipe, the initial section of the slag discharge pipe is connected to a nitrogen purge pipe through a first nitrogen valve, an end of the middle section of the slag discharge pipe close to the first slag discharge valve is connected to the nitrogen purge pipe through a second nitrogen valve, an end of the middle section of the slag discharge pipe close to the second slag discharge valve is connected to the nitrogen purge pipe through a third nitrogen valve, and comprises a slag pot, and the final section of the slag discharge pipe is connected to the slag pot.

[0005] Furthermore, a waste gas connecting pipe is arranged on the top of the slag pot.

[0006] Furthermore, a tailings discharge pipe is provided at the bottom of the slag pot.

[0007] Furthermore, a tailings weigher is provided in the slag pot.

[0008] Furthermore, the slag discharge pipe is arranged horizontally.

[0009] The beneficial effect of the present invention is that in actual use, the residue remaining after the reaction in the fluidized bed reactor has an adverse effect on the fluidized state of the fluidized bed and needs to be discharged. Since the titanium slag reacts with chlorine in the boiling chlorination furnace to generate titanium tetrachloride, the impurities in the titanium slag such as CaO, MgO, Fe 2 O 3 It will also react with chlorine to form CaCl2 MgCl 2 、FeCl 3 The above impurities and unreacted raw materials need to be discharged from the boiling chlorination furnace as tailings at regular intervals. Through the coordination between the opening and closing of each valve body in the fluidized bed deslagging device and the opening and closing of the purge gas valve body, the fluidized bed deslagging can be well realized in a closed, online and continuous manner, thereby ensuring the continuous and stable operation of the fluidized bed and significantly improving the production efficiency of the fluidized bed. The present invention is particularly suitable for deslagging in a fluidized bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Marked in the figure are: boiling chlorination furnace 1, slag pot 2, tailings discharge pipe 21, waste gas connecting pipe 22, slag pot air inlet pipe 23, waste gas discharge direction 3, first nitrogen valve 31, second nitrogen valve 32, third nitrogen valve 33, slag discharge pipe 4, initial section of slag discharge pipe 41, middle section of slag discharge pipe 42, final section of slag discharge pipe 43, first slag discharge valve 44, second slag discharge valve 45. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with the accompanying drawings.

[0013] like Figure 1 The fluidized bed slag discharge device shown comprises a slag discharge pipe 4 which is sequentially composed of an initial slag discharge pipe section 41, a middle slag discharge pipe section 42 and a final slag discharge pipe section 43; a first slag discharge valve 44 is provided between the initial slag discharge pipe section 41 and the middle slag discharge pipe section 42; a second slag discharge valve 45 is provided between the middle slag discharge pipe section 42 and the final slag discharge pipe section 43; the initial slag discharge pipe section 41 is connected to a nitrogen purge pipe via a first nitrogen valve 31; an end of the middle slag discharge pipe section 42 close to the first slag discharge valve 44 is connected to a nitrogen purge pipe via a second nitrogen valve 32; an end of the middle slag discharge pipe section 42 close to the second slag discharge valve 45 is connected to a nitrogen purge pipe via a third nitrogen valve 33; the device comprises a slag pot 2; and the final slag discharge pipe section 43 is connected to the slag pot 2.

[0014] In order to better discharge the waste gas in the slag pot 2 and process the waste gas, a waste gas connection pipe 22 may be optionally provided at the top of the slag pot 2. In order to more conveniently discharge the tailings, a tailings discharge pipe 21 may be optionally provided at the bottom of the slag pot 2. In order to discharge the tailings through the bottom discharge port when the required weight is reached, a tailings weigher is preferably provided in the slag pot 2. Generally, it is preferred that the slag discharge pipe 4 is arranged horizontally.

[0015] The actual operation of this device is as follows: first, the initial section 41 of the slag discharge pipe of the fluidized bed slag discharge device is connected to the bottom of the boiling chlorination furnace 1. At first, the initial states of the first slag discharge valve 44 and the second slag discharge valve 45 are closed, the initial states of the first nitrogen valve 31 are open, and the initial states of the second nitrogen valve 32 and the third nitrogen valve 33 are closed. At the beginning, since the initial state of the first nitrogen valve 31 is open, nitrogen is purged through the first nitrogen valve 31 to keep the pipeline between the boiling chlorination furnace 1 and the first slag discharge valve 44 clean and maintain a low temperature. Subsequently, when the slag discharge starts, the first slag discharge valve 44 is opened, the first nitrogen valve 31 is closed, and the slag in the boiling chlorination furnace 1 enters the slag discharge pipe 4 under the action of fluidization, and then the third nitrogen valve 33 is opened, and the nitrogen is used to remove the Cl in the slag discharge pipe. 2 、TiCl 4 The gas is blown back to the boiling chlorination furnace 1. According to the different medium states in the boiling chlorination furnace 1, the opening time of the first slag discharge valve 44 is set. Generally, the opening time of the first slag discharge valve 44 is 3 minutes to 5 minutes, and the slag discharge pipe 4 is filled. After the slag discharge pipe 4 is filled, the third nitrogen valve 33 is closed, the first slag discharge valve 44 is closed, the first nitrogen valve 31 is opened, and then the second slag discharge valve 45 is opened, and then the second nitrogen valve 32 is opened, and a large amount of nitrogen is introduced into the slag discharge pipe 4 through the second nitrogen valve 32 to blow the tailings in the slag discharge pipe 4 into the slag pot 2. Generally, the purge time of the second nitrogen valve 32 is about 2 minutes, and then the second nitrogen valve 32 is closed, and the second slag discharge valve 45 is closed. At this time, the tailings have been discharged into the slag pot 2, and each valve returns to the state where the first nitrogen valve 31 is opened, the second nitrogen valve 32 and the third nitrogen valve 33 are closed, and the first slag discharge valve 44 and the second slag discharge valve 45 are closed, thereby starting the next cycle.

[0016] The present invention can realize closed, online and continuous fluidized bed slag discharge, thereby ensuring continuous and stable operation of the fluidized bed. The technical advantages are very obvious and the market promotion prospects are very broad.

Claims

1. Fluidized bed slag discharge device, characterized in that: The invention comprises a slag discharge pipe (4) which is sequentially composed of an initial slag discharge pipe section (41), a middle slag discharge pipe section (42) and a final slag discharge pipe section (43); a first slag discharge valve (44) is arranged between the initial slag discharge pipe section (41) and the middle slag discharge pipe section (42); a second slag discharge valve (45) is arranged between the middle slag discharge pipe section (42) and the final slag discharge pipe section (43); the initial slag discharge pipe section (41) is connected to a nitrogen purge pipe via a first nitrogen valve (31); the middle slag discharge pipe section (42) is connected to a nitrogen purge pipe via a first nitrogen valve (31); The end of the slag discharge pipe (42) near the first slag discharge valve (44) is connected to the nitrogen purge pipe through the second nitrogen valve (32), and the end of the slag discharge pipe middle section (42) near the second slag discharge valve (45) is connected to the nitrogen purge pipe through the third nitrogen valve (33), comprising a slag tank (2), and the end section (43) of the slag discharge pipe is connected to the slag tank (2); the top of the slag tank (2) is provided with an exhaust gas connecting pipe (22), and the bottom of the slag tank (2) is provided with a tailing discharge pipe (21).

2. The fluidized bed slag discharge device according to claim 1, characterized in that: A tailings weigher is arranged in the slag pot (2).

3. The fluidized bed slag discharge device according to claim 1 or 2, characterized in that: The slag discharge pipe (4) is arranged horizontally.

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