Chlorine injection device
The design of the spirally wrapped heating tube structure and the low-temperature mixed steam heater solved the problems of scaling and low temperature during the decomposition of tetrachloroethylene, and achieved an efficient catalyst chlorination effect.
Patent Information
- Application Number
- CN202421711690.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In the prior art, tetrachloroethylene decomposes and forms scale in the heater, causing blockage, and the chlorine injection temperature is relatively low, affecting the chlorination effect of the catalyst.
Using a spirally wound heating tube structure, combined with low-temperature mixing and steam heaters, tetrachloroethylene and nitrogen are first mixed and heated to 130°C to form mixed steam which is then injected into the regenerator to increase the injection temperature and dispersion of chlorine.
It effectively solves the problems of poor dispersion of tetrachloroethylene and difficulty in chlorine addition to the catalyst, and improves the chlorine injection effect.
Smart Images
Figure CN223439783U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of catalyst regeneration, in particular to a chlorine injection device. Background Art
[0002] The catalyst in a dehydrogenation unit is the core component of the unit. Refined naphtha from upstream units, under high-temperature hydrogenation conditions, undergoes reactions such as cycloparaffin dehydrogenation, linear alkane isomerization, and alkane dehydrocyclization on the dehydrogenation catalyst, producing aromatics and hydrogen as a byproduct. The dehydrogenation catalyst is a dual-functional catalyst with both metallic and acidic properties. The platinum on the catalyst provides the metallic function for dehydrogenation, while the chlorine on the catalyst provides the acidic function for isomerization and cyclization. During catalyst regeneration, chlorine is lost, reducing the acidic function. Therefore, chlorine injection is necessary in the oxychlorination zone of the catalyst regeneration section to restore the acidic function. Chlorine injection also facilitates the dispersion of the platinum metal, improving the catalyst's metallic properties. To enhance the effectiveness of chlorine injection, tetrachloroethylene should be heated and then dispersed with nitrogen to raise the chlorination temperature and increase the binding capacity of the catalyst with tetrachloroethylene. However, existing methods pre-heat the catalyst before dispersing it, resulting in tetrachloroethylene decomposition and scaling in the heater, which can cause prolonged blockage. Furthermore, the lack of a heating source after nitrogen dispersion results in low chlorine injection temperatures and poor catalyst chlorination. Summary of the Invention
[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a chlorine injection device that can effectively improve the chlorine injection effect to solve the above-mentioned problems.
[0004] The utility model provides a chlorine injection device, comprising a chlorine tank and a nitrogen tank, wherein the chlorine tank is connected to a chlorine injection pump, the chlorine injection pump is connected to a mixer, the nitrogen tank is connected to the mixer, the mixer is connected to a steam heater, and the steam heater is connected to a regenerator;
[0005] The steam heater includes a tank body, a heating tube is arranged in the tank body, and the heating tube is spirally arranged in the tank body. The heating tube is a hollow tube and includes a first spiral tube and a second spiral tube. The first spiral tube is coaxially arranged with the tank body, and the second spiral tube is sleeved on the outside of the first spiral tube. The input ends of the first spiral tube and the second spiral tube are connected to the steam input tube, and the output ends of the first spiral tube and the second spiral tube are connected to the steam output tube.
[0006] Furthermore, a first diverter valve is provided between the input ends of the first spiral tube and the second spiral tube, and a second diverter valve is provided between the output ends of the first spiral tube and the second spiral tube. The first diverter valve is connected to the steam input pipe, and the second diverter valve is connected to the steam output pipe.
[0007] Furthermore, the input end and the output end of the heating tube are both arranged at the same end of the tank body.
[0008] Furthermore, an outlet pipe is provided at the top of the tank body, and an inlet pipe is provided at the bottom.
[0009] Furthermore, a water dispersion cover is provided in the tank body and is located on the inlet pipe. The water dispersion cover is in an arc shape.
[0010] Furthermore, the top of the tank body is arc-shaped.
[0011] Compared with the existing technology, the chlorine injection device mixes tetrachloroethylene with nitrogen at a low temperature stage, heats the mixture through a steam heater and injects it into the regenerator, which not only increases the chlorine injection temperature but also increases the dispersion of tetrachloroethylene. It can effectively solve the problems of poor dispersion of tetrachloroethylene injected into the regeneration part of the dehydrogenation unit and difficulty in chlorine on the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0013] Figure 2 It is a structural diagram of a steam heater;
[0014] Figure 3 A top view of a steam heater.
[0015] In the figure: 1. Chlorine tank; 2. Nitrogen tank; 3. Chlorine injection pump; 4. Mixer; 5. Steam heater; 6. Regenerator; 7. Tank body; 8. First spiral tube; 9. Second spiral tube; 10. First diverter valve; 11. Second diverter valve; 12. Outlet pipe; 13. Inlet pipe; 14. Diffuser hood. DETAILED DESCRIPTION
[0016] In order to better understand the present invention, Figures 1 to 3 The embodiments of the present invention will be explained in detail.
[0017] It should be noted that the directions “front, back, left, right, up, down” mentioned in the text are all based on Figure 1 The directions of “front, back, left, right, up and down” are used as the reference.
[0018] like Figure 1 As shown in , a chlorine injection device of the present invention comprises a chlorine tank 1 and a nitrogen tank 2, wherein the chlorine tank 1 is connected to a chlorine injection pump 3, the chlorine injection pump 3 is connected to a mixer 4, the nitrogen tank 2 is connected to the mixer 4, the mixer 4 is connected to a steam heater 5, and the steam heater 5 is connected to a regenerator 6;
[0019] like Figure 2 and Figure 3As shown in the figure, the steam heater 5 comprises a tank body 7, a heating pipe is arranged in the tank body 7, the heating pipe is spirally arranged in the tank body 7, the heating pipe is a hollow pipe, the heating pipe comprises a first spiral pipe 8 and a second spiral pipe 9, the first spiral pipe 8 is coaxially arranged with the tank body 7, the second spiral pipe 9 is sleeved outside the first spiral pipe 8, the input ends of the first spiral pipe 8 and the second spiral pipe 9 are connected with the steam input pipe, and the output ends of the first spiral pipe 8 and the second spiral pipe 9 are connected with the steam output pipe. The first spiral pipe 8 and the second spiral pipe 9 are heated at the same time, the mixture in the tank body 7 can be uniformly heated, and the heating efficiency is improved.
[0020] In the preferred technical scheme of the embodiment, the first split valve 10 is connected between the input ends of the first spiral pipe 8 and the second spiral pipe 9, the second split valve 11 is connected between the output ends of the first spiral pipe 8 and the second spiral pipe 9, the first split valve 10 is connected with the steam input pipe, and the second split valve 11 is connected with the steam output pipe.
[0021] In the preferred technical scheme of the embodiment, the input ends of the first spiral pipe 8 and the second spiral pipe 9 are vertically penetrated from the bottom of the tank body 7, and the output ends are penetrated out after spirally downward to the bottom of the tank body 7. By inputting steam in reverse, the steam is transported from top to bottom in the structure of the spiral coil pipe, and the mixture in the tank body 7 is heated in a countercurrent manner, so that the steam can be fully condensed in the first spiral pipe 8 and the second spiral pipe 9.
[0022] In the preferred technical scheme of the embodiment, the input ends and the output ends of the heating pipe are arranged at the same end of the tank body 7, so as to facilitate disassembly, assembly or maintenance operation.
[0023] In the preferred technical scheme of the embodiment, the top of the tank body 7 is provided with an outlet pipe 12, and the bottom is provided with an inlet pipe 13.
[0024] In the preferred technical scheme of the embodiment, the tank body 7 is provided with a water distribution cover 14 located at the top of the inlet pipe 13, the inlet pipe 13 is arranged on the side surface of the tank body 7, and the water distribution cover 14 is in the shape of a circular arc. The water distribution cover 14 is used for buffering the mixture entering the tank body 7, preventing the mixture from generating water column when entering the tank body 7, and preventing the mixture from being distributed, so that the water is scattered by the water distribution cover 14 and uniformly flows upward.
[0025] In the preferred technical scheme of the embodiment, the top of the tank body 7 is in the shape of a circular arc, so as to facilitate the collection of the mixed steam of tetrachloroethylene steam and nitrogen.
[0026] The utility model discloses a running principle: the tetrachloroethylene in chlorine tank 1 is boosted after injection chlorine pump 3, and mixes with 0.8Mpa, 100 DEG C's dispersed nitrogen gas in mixer 4, and then enters steam heater 5, steam heater 5 uses 180 DEG C low-pressure steam as heat source, heats the mixture of tetrachloroethylene and nitrogen gas in tank body 7, and after heating to 130 DEG C (tetrachloroethylene boiling point 121 DEG C) after steam heater 5, forms tetrachloroethylene steam and the mixed steam of nitrogen gas, enters regenerator 6 inside, and contacts catalyst.
[0027] In the description of the utility model, need understanding is, the orientation or position relation that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" indicate is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and is not the device or element that the indicated is indicated or implied must have a particular orientation, with a particular orientation structure and operation, therefore can not be understood as the restriction of the utility model. In the description of the utility model, unless otherwise specified and limited, need to explain, the terms "mounting", "connecting", "connection" should be broad sense, for example, can be mechanical connection or electric connection, can be the intercommunication of two elements, can be directly connected, also can be indirectly connected through intermediate medium, for the ordinary skilled in the art, can understand the specific meaning of the above terms according to the specific circumstances.
[0028] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A chlorine injection device, characterized in that: The invention comprises a chlorine tank (1) and a nitrogen tank (2), wherein the chlorine tank (1) is connected to a chlorine injection pump (3), the chlorine injection pump (3) is connected to a mixer (4), the nitrogen tank (2) is connected to the mixer (4), the mixer (4) is connected to a steam heater (5), and the steam heater (5) is connected to a regenerator (6); The steam heater (5) comprises a tank body (7), a heating tube is arranged in the tank body (7), the heating tube is spirally arranged in the tank body (7), the heating tube is a hollow tube, the heating tube comprises a first spiral tube (8) and a second spiral tube (9), the first spiral tube (8) is coaxially arranged with the tank body (7), the second spiral tube (9) is sleeved on the outside of the first spiral tube (8), the input ends of the first spiral tube (8) and the second spiral tube (9) are connected to the steam input tube, and the output ends of the first spiral tube (8) and the second spiral tube (9) are connected to the steam output tube.
2. A chlorine injection device as claimed in claim 1, characterized in that: A first diverter valve (10) is provided between the input ends of the first spiral tube (8) and the second spiral tube (9), and a second diverter valve (11) is provided between the output ends of the first spiral tube (8) and the second spiral tube (9). The first diverter valve (10) is connected to the steam input pipe, and the second diverter valve (11) is connected to the steam output pipe.
3. A chlorine injection device as claimed in claim 1, characterized in that: The input end and the output end of the heating tube are both arranged at the same end of the tank body (7).
4. A chlorine injection device as claimed in claim 1, characterized in that: An outlet pipe (12) is provided at the top of the tank body (7), and an inlet pipe (13) is provided at the bottom.
5. A chlorine injection device as claimed in claim 4, characterized in that: A water dispersion cover (14) located on the inlet pipe (13) is provided in the tank body (7), and the water dispersion cover (14) is in an arc shape.
6. A chlorine injection device as claimed in claim 1, characterized in that: The top of the tank body (7) is in an arc shape.