Heat accumulating type low-temperature denitration process for flue gas of acid regeneration furnace
By using a standby thermal storage system to heat and divert flue gas, the problem of flue gas at normal temperature being corrosive with hydrogen chloride and unable to be denitrified at low temperatures is solved. This achieves effective denitrification and avoidance of hydrogen chloride corrosion under low-temperature conditions, resulting in good and reliable treatment.
Patent Information
- Application Number
- CN202511795714.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-02-27
AI Technical Summary
Flue gas at room temperature is corrosive with hydrogen chloride and cannot be effectively denitrified at low temperatures. Existing technologies cannot effectively control nitrogen oxides in acid reprocessing production lines.
A one-in-one-out heat storage system is adopted. Low-temperature flue gas is controlled by valves to enter heat storage A and be heated to the appropriate temperature for denitrification. High-temperature flue gas is diverted to heat storage B. The temperature reaches 150℃ when switching cycles. Ceramic heat storage and stainless steel pipes are used.
It achieves effective denitrification under low-temperature conditions, avoids hydrogen chloride corrosion, has good and reliable treatment effect, suitable flue gas temperature, and high overall reliability.
Smart Images
Figure CN121576803A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a low-temperature denitration process, in particular to a regenerative low-temperature denitration process. BACKGROUND
[0002] In the environmental protection treatment process of the flue gas of the acid regeneration line, the flue gas is at room temperature and contains corrosive hydrogen chloride gas. The flue gas at room temperature cannot reach the suitable temperature for denitration and cannot effectively treat nitrogen oxides, and the corrosion is relatively strong at low temperature. SUMMARY
[0003] The purpose of the present application is to overcome the shortcomings of the prior art and provide an acid regeneration furnace flue gas regenerative low-temperature denitration process with good treatment effect and switchable use.
[0004] Technical scheme: In order to solve the above technical problems, the acid regeneration furnace flue gas regenerative low-temperature denitration process comprises the following steps, (1) One standby regenerator is set up, which is divided into regenerator A and regenerator B; (2) One way of low-temperature flue gas enters regenerator A through a valve, and the temperature of the flue gas is raised by a temperature control system after passing through regenerator A, and the flue gas after being raised reaches the suitable temperature for denitration; (3) The flue gas after denitration treatment is relatively high in temperature, and is also divided into two ways and enters one of the regenerators B through a valve, and the flue gas after passing through the regenerator B reaches the exhaust temperature; (4) When the temperature of one of the regenerators reaches 150 DEG C, the other one is switched to reciprocating circulation.
[0005] Further, the regenerator A is connected with four pipes, which are divided into pipe A I, pipe A II, pipe A III and pipe A IV, a valve A I is arranged on the pipe A I, a valve A II is arranged on the pipe A II, a valve A III is arranged on the pipe A III, and a valve A IV is arranged on the pipe A IV, the regenerator B is connected with four pipes, which are divided into pipe B I, pipe B II, pipe B III and pipe B IV, a valve B I is arranged on the pipe B I, a valve B II is arranged on the pipe B II, a valve B III is arranged on the pipe B III, and a valve B IV is arranged on the pipe B IV, the pipe A IV and the pipe B IV are connected with the front end of the denitration reactor, a temperature control system is arranged on the pipe I connected with the regenerator A and the regenerator B at the rear end of the denitration reactor, the pipe A III and the pipe B II are connected with the exhaust passage, the pipe A I and the pipe B I are connected with the flue gas inlet pipe, and the rear end of the denitration reactor is connected with the pipe B III and the pipe A II through the pipe II.
[0006] Further, the temperature control system is arranged on the pipe I between the pipe A IV and the denitration reactor.
[0007] In the application, the heat accumulator adopts ceramic material, and the pipeline adopts stainless steel material.
[0008] Advantages: compared with the prior art, the application has the following advantages: a one-use and one-backup type heat accumulator is arranged at a suitable position, low-temperature flue gas is first introduced into the heat accumulator A through a valve, the flue gas is heated by a temperature control system after passing through the heat accumulator, the heated flue gas reaches a suitable temperature for denitration, the treated flue gas has a high temperature and is introduced into one of the heat accumulators B through a valve, the flue gas discharged from the heat accumulator B reaches the exhaust temperature, when the temperature of one of the heat accumulators reaches 150℃, the other heat accumulator is switched to reciprocate, the whole is reliable in use and good in treatment effect. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 is a schematic diagram of the overall structure of the application. DETAILED DESCRIPTION
[0010] The application will be further described below in combination with the drawings and examples.
[0011] As shown in Figure 1 , the acid regenerator flue gas heat accumulating type low-temperature denitration process comprises the following steps, (1) a one-use and one-backup type heat accumulator is arranged, which is divided into a heat accumulator A and a heat accumulator B; (2) low-temperature flue gas is introduced into the heat accumulator A through a valve, the flue gas is heated by a temperature control system after passing through the heat accumulator A, and the heated flue gas reaches a suitable temperature for denitration; (3) the treated flue gas has a high temperature, is introduced into one of the heat accumulators B through a valve, and the flue gas discharged from the heat accumulator B reaches the exhaust temperature; (4) when the temperature of one of the heat accumulators reaches 150℃, the other heat accumulator is switched to reciprocate.
[0012] The heat accumulator A1 is connected with four pipes respectively, which are divided into pipe A I2, pipe A II3, pipe A III4 and pipe A IV5, a valve A I6 is arranged on the pipe A I2, a valve A II7 is arranged on the pipe A II3, a valve A III8 is arranged on the pipe A III4, and a valve A IV9 is arranged on the pipe A IV5, the heat accumulator B10 is connected with four pipes respectively, which are divided into pipe B I11, pipe B II12, pipe B III13 and pipe B IV14, a valve B I15 is arranged on the pipe B I11, a valve B II16 is arranged on the pipe B II12, a valve B III17 is arranged on the pipe B III13, and a valve B IV18 is arranged on the pipe B IV14, the pipe A IV5 and the pipe B IV14 are connected with the front end of a denitration reactor 19, a temperature control system 21 is arranged on the pipe I20 connected with the heat accumulator A1 and the heat accumulator B10 and the denitration reactor 19, the temperature control system 21 is arranged on the pipe I20 between the pipe A IV5 and the denitration reactor 19, the pipe A III4 and the pipe B II12 are connected with an exhaust flue 22, the pipe A I2 and the pipe B I11 are connected with a flue gas inlet pipe 23, and the rear end of the denitration reactor 19 is connected with the pipe B III13 and the pipe A II3 respectively through a pipe II24.
[0013] The application sets up a standby heat accumulator at a suitable position, first, low-temperature flue gas is introduced into the heat accumulator A through a valve, the flue gas is heated by a temperature control system after passing through the heat accumulator, the heated flue gas reaches a suitable denitration temperature, the treated flue gas is high in temperature and is introduced into one of the heat accumulators B through a valve, the flue gas reaching an exhaust temperature is discharged from the heat accumulator, when the temperature of one of the heat accumulators reaches 150 DEG C, the other heat accumulator is switched to reciprocating circulation, the whole is reliable in use and good in treatment effect.
[0014] The application provides a kind of thought and method, the method and approach for specifically realizing this technical scheme are many, the above-mentioned is only the preferred embodiment of the application, it should be pointed out that, for the ordinary skilled in the art, on the premise of not departing from the principle of the application, can make a number of improvements and refinements, these improvements and refinements should also be regarded as the protection scope of the application, the components not explicitly described in the embodiment can be realized by the prior art.
Claims
1. A regenerative low-temperature denitrification process for acid regeneration furnace flue gas, characterized in that: It includes the following steps: (1) Set up a one-use-one-standby heat storage body, which is divided into heat storage body A and heat storage body B; (2) A low-temperature flue gas is controlled by a valve to enter the heat storage body A. After passing through the heat storage body A, the flue gas is heated by the temperature control system. The heated flue gas reaches the appropriate temperature for denitrification. (3) The flue gas temperature after denitrification is relatively high. It is also divided into two paths and enters one of the heat storage bodies B through valve control. The flue gas coming out of the heat storage body B reaches the exhaust temperature. (4) When the temperature of one of the heat storage bodies reaches 150°C, switch to the other reciprocating cycle.
2. The regenerative low-temperature denitrification process for acid regeneration furnace flue gas according to claim 1, characterized in that: The heat storage body A (1) is connected to four pipes, namely pipe AⅠ (2), pipe AⅡ (3), pipe AⅢ (4), and pipe AⅣ (5). A valve AⅠ (6) is installed on pipe AⅠ (2), a valve AⅡ (7) is installed on pipe AⅡ (3), a valve AⅢ (8) is installed on pipe AⅢ (4), and a valve AⅣ (9) is installed on pipe AⅣ (5). The heat storage body B (10) is connected to four pipes, namely pipe BⅠ (11), pipe BⅡ (12), pipe BⅢ (13), and pipe BⅣ (14). A valve BⅠ (15) is installed on pipe BⅠ (11), and a valve BⅡ (9) is installed on pipe BⅡ (12). 16), valve BⅢ (17) is provided on the pipe BⅢ (13), valve BⅣ (18) is provided on the pipe BⅣ (14), pipe AⅣ (5) and pipe BⅣ (14) are both connected to the front end of the denitrification reactor (19), a temperature control system (21) is provided on the pipe I (20) that connects the denitrification reactor (19) to the heat storage body A (1) and the heat storage body B (10), pipe AⅢ (4) and pipe BⅡ (12) are both connected to the flue gas passage (22), pipe AⅠ (2) and pipe BⅠ (11) are both connected to the flue gas inlet pipe (23), and the rear end of the denitrification reactor (19) is connected to pipe BⅢ (13) and pipe AⅡ (3) respectively through pipe II (24).
3. The regenerative low-temperature denitrification process for acid regeneration furnace flue gas according to claim 2, characterized in that: The temperature control system (21) is located on pipe I (20) between pipe AⅣ (5) and denitrification reactor (19).