Denitration catalyst paste preparation system
By using high shear stirrer and binder in the denitrification catalyst paste preparation system, the problem of insufficient mixing of active components and support is solved, and the denitrification activity and stability of the catalyst is improved. It is suitable for different structures and types of Catalyst paste preparation.
Patent Information
- Application Number
- CN202420354406.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-26
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-02-26
AI Technical Summary
In the production process of industrial denitrification catalysts, insufficient mixing of active components and support leads to insufficient denitrification activity and stability of the catalyst, making it difficult to prepare efficient and long-lived catalysts.
A denitrogenation catalyst paste preparation system is adopted, including a water tank, a salt solution tank, a mixing tank and an evaporation tank. The active components and auxiliary agents are fully mixed with the carrier through a high shear stirrer, and the catalyst paste is formed by combining the binder. The water content and solid-liquid ratio of the catalyst are controlled.
The active components and support are fully mixed, the denitrification activity and stability of the catalyst are improved, and it is suitable for the preparation of denitrification catalyst paste of different structures and types, and the production process is simplified.
Smart Images
Figure CN222305578U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of a denitration catalyst preparation system, in particular to a denitration catalyst paste preparation system. Background Art
[0002] Selective catalytic reduction (SCR) is the most effective process for removing nitrogen oxides (NOx) and is widely used in denitration projects in coal-fired power plants, steel and other industries. Industrial denitration catalysts are mainly vanadium-titanium-based catalysts, with anatase TiO2 as the carrier, V2O5 as the active component, and WO3 / MoO3 as the additive. The mixing of the active component, additive and carrier will affect the degree of dispersion of the active component on the carrier, the structure and valence of the active component, the magnitude of the interaction between the active component and the carrier, etc., thereby affecting the denitration activity and stability of the catalyst. In the production process of industrial denitration catalysts, in order to obtain denitration catalysts with high denitration activity and long life, the catalyst preparation process needs to be strictly controlled. Utility Model Content
[0003] The utility model aims to provide a denitration catalyst paste preparation system for the production of coated denitration catalysts.
[0004] The utility model provides a denitration catalyst paste preparation system, comprising a water tank (1), a salt solution tank (2) and a mixing tank (6), wherein the water tank (1) and the salt solution tank (2) are respectively connected to the mixing tank (6), a high shear agitator (5) is installed on the mixing tank (6), a titanium dioxide storage tank is connected to the mixing tank (6), a discharge port of the mixing tank (6) is connected to an evaporation tank (7), a discharge port of the evaporation tank (7) is connected to a mixing tank (8), a binder storage tank is connected to the mixing tank (8), and an exhaust port of the evaporation tank (7) is connected to the water tank (1).
[0005] Furthermore, a water pump (3) is installed on the delivery pipeline between the water tank (1) and the mixing tank (6).
[0006] Furthermore, a salt solution pump (4) is installed on the delivery pipeline between the salt solution tank (2) and the mixing tank (6).
[0007] Furthermore, the salt solution in the salt solution tank (2) is an aqueous solution of ammonium metavanadate and ammonium heptamolybdate.
[0008] Furthermore, the rotation speed of the high shear agitator (5) is between 10000 and 15000 rpm.
[0009] Furthermore, the solid-liquid ratio in the mixing tank (6) is 1:2 to 1:4.
[0010] Furthermore, after the excess water is evaporated in the evaporation tank (7), the water content of the catalyst paste is 30-40 wt%.
[0011] Further, the binder is a mixture of hydroxyethyl cellulose, clay and glass fiber.
[0012] Furthermore, the water evaporated in the evaporation tank (7) flows back to the water tank (1).
[0013] Furthermore, the paste produced in the mixing tank (8) enters the downstream preparation link of the denitration catalyst.
[0014] The utility model has a simple process and can achieve full mixing of active components, additives and carriers through high shear enhanced mixing, thereby ensuring high denitration activity and stability of the catalyst, and is suitable for the preparation of denitration catalyst pastes of different structures and types. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 This is the system process flow chart of the utility model;
[0017] Description of reference numerals:
[0018] In the figure: 1-water tank, 2-salt solution tank, 3-water pump, 4-salt solution pump, 5-high shear agitator, 6-mixing tank, 7-evaporation tank, 8-mixing tank; DETAILED DESCRIPTION
[0019] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" 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 should not be understood as a limitation on the present invention.
[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0022] Example 1
[0023] like Figure 1 As shown:
[0024] A denitration catalyst paste preparation system comprises a water tank 1, a salt solution tank 2, a water pump 3, a salt solution pump 4, a high shear agitator 5, a mixing tank 6, an evaporation tank 7 and a mixing tank 8.
[0025] The deionized water in the water tank 1 is transported to the mixing tank 6 through the water pump 3, and the salt solution in the salt solution tank 2 is transported to the mixing tank 6 through the salt solution pump 4. The salt solution in the salt solution tank 2 is an aqueous solution of ammonium metavanadate and ammonium heptamolybdate.
[0026] The high shear stirrer 5 is installed on the mixing tank 6, and a titanium dioxide storage tank is installed on the mixing tank 6. The stirring shaft of the high shear stirrer 5 extends into the mixing tank 6, and the rotation speed of the high shear stirrer 5 is 10000-15000 rpm.
[0027] After the aqueous salt solution and water enter the mixing tank 6 , the high shear agitator 5 is started, and titanium dioxide is slowly added into the mixing tank 6 .
[0028] The discharge port of the mixing tank 6 is connected to the evaporation tank 7 , the discharge port of the evaporation tank 7 is connected to the mixing tank 8 , and the exhaust port of the evaporation tank 7 is connected to the water tank 1 .
[0029] After the salt solution and titanium dioxide are mixed evenly in the mixing tank 6, they enter the evaporation tank 7 to remove excess water. After the excess water is evaporated, the water content of the catalyst paste is 30-40wt%. The water evaporated in the evaporation tank 7 flows back to the water tank 1.
[0030] The discharge port of the evaporation tank 7 is connected to a mixing tank 8, and the mixing tank 8 is connected to a binder storage tank.
[0031] The material in the evaporation tank 7 enters the mixing tank 8, which mixes the material and the binder evenly to form a denitration catalyst paste, wherein the binder is a mixture of hydroxyethyl cellulose, clay and glass fiber. The paste obtained in the mixing tank 8 enters the downstream preparation link of the denitration catalyst.
[0032] The runtime includes the following steps:
[0033] (1) Turn on the salt solution pump 4 and the water pump 3, and inject the aqueous solution of ammonium metavanadate and ammonium heptamolybdate and water into the mixing tank 6;
[0034] (2) starting the high shear agitator 5 and setting the rotation speed to 10000 rpm;
[0035] (3) Slowly adding anatase titanium dioxide to the mixing tank 6, after the addition is completed, the solid-liquid ratio in the mixing tank 6 is 1:2, and the shear mixing is continued for 1 hour;
[0036] (4) The mixed liquid in the mixing tank 6 is injected into the evaporation tank 7 to evaporate the excess water in the mixed liquid and return it to the water tank 1;
[0037] (4) After evaporation in the evaporation tank 7, the obtained material with a moisture content of 30% enters the mixing tank 8, and a mixture of hydroxyethyl cellulose, clay and glass fiber is slowly added;
[0038] (5) After mixing in the mixing tank 8 for 2 hours, a denitration catalyst paste is obtained.
[0039] The utility model has a simple process and can achieve full mixing of active components, additives and carriers through high shear enhanced mixing, thereby ensuring high denitration activity and stability of the catalyst, and is suitable for the preparation of denitration catalyst pastes of different structures and types.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A denitration catalyst paste preparation system, characterized in that: The invention comprises a water tank (1), a salt solution tank (2) and a mixing tank (6), wherein the water tank (1) and the salt solution tank (2) are respectively connected to the mixing tank (6), a high shear stirrer (5) is installed on the mixing tank (6), a titanium dioxide storage tank is connected to the mixing tank (6), a discharge port of the mixing tank (6) is connected to an evaporation tank (7), a discharge port of the evaporation tank (7) is connected to a mixing tank (8), a binder storage tank is connected to the mixing tank (8), and an exhaust port of the evaporation tank (7) is connected to the water tank (1).
2. The denitration catalyst paste preparation system according to claim 1, characterized in that: A water pump (3) is installed on the delivery pipeline between the water tank (1) and the mixing tank (6).
3. The denitration catalyst paste preparation system according to claim 1, characterized in that: A salt solution pump (4) is installed on the delivery pipeline between the salt solution tank (2) and the mixing tank (6).
4. The denitration catalyst paste preparation system according to claim 1, characterized in that: The rotation speed of the high shear stirrer (5) is between 10000 and 15000 rpm.
5. The denitration catalyst paste preparation system according to claim 1, characterized in that: The water evaporated in the evaporation tank (7) flows back to the water tank (1).
6. The denitration catalyst paste preparation system according to claim 1, characterized in that: The paste produced in the mixing tank (8) enters the downstream preparation link of the denitration catalyst.