Kiln tail flue gas desulfurization system
By introducing a flue gas desulfurization system into the cement kiln system and utilizing sensor monitoring and powder airflow injection technology, the problem of fluctuating sulfur dioxide emissions was solved, achieving rapid emission reduction and cost optimization, and ensuring system stability.
Patent Information
- Application Number
- CN202422733926.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-11
AI Technical Summary
Existing technologies in cement kiln systems cause sulfur dioxide emission concentration fluctuations exceeding standards and ammonia escape, leading to high desulfurization costs and environmental risks, affecting the safe and stable operation of the system.
A kiln tail flue gas desulfurization system is used, which monitors the concentration in real time through a sulfur dioxide sensor, and uses a negative pressure feeder and a Roots vacuum pump to inject desulfurization powder and airflow, which are mixed and sprayed into the kiln tail pipe to quickly reduce sulfur dioxide emissions.
Rapidly reduce sulfur dioxide emissions in a short period of time, avoid excessive sulfur and ammonia escape, reduce desulfurization costs, and ensure the safe and stable operation of the cement kiln system.
Smart Images
Figure CN223366630U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cement kilns, in particular to a kiln tail flue gas desulfurization system. Background Art
[0002] To control sulfur dioxide emissions from the flue gas at the tail end of a cement kiln system to meet the 200mg / m³ limit specified in the "GB4915-2013 Cement Industry Air Pollutant Emission Standard," a desulfurizer must be added to the raw meal chute for catalytic desulfurization. Ammonia desulfurization, spraying ammonia water into the preheater piping, is also required to control flue gas sulfur dioxide emissions. Due to the long reaction cycle between the desulfurizer and ammonia water, sulfur dioxide emissions cannot be reduced quickly. Consequently, existing technologies experience periodic sulfur exceeding the standard and significant ammonia slip, increasing the desulfurization cost per ton of clinker. Especially during raw mill downtime, sulfur dioxide emission concentrations in the tail end of the kiln flue gas frequently fluctuate or briefly exceed the limit, posing the risk of environmental penalties for exceeding emission standards and significantly impacting the safe and stable operation of the cement kiln system. Utility Model Content
[0003] The purpose of this utility model is to address the above-mentioned deficiencies and provide a kiln tail flue gas desulfurization system, which can quickly reduce the emission value of sulfur dioxide in the kiln tail flue gas in a short period of time, avoid the occurrence of periodic sulfur exceeding the standard and more serious ammonia escape, reduce the desulfurization cost per ton of clinker, and avoid the risk of environmental protection penalties due to excessive emissions, so as to make the operation of the cement kiln system safer and more stable.
[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0005] A kiln tail flue gas desulfurization system includes a frame, a controller arranged on the frame, a negative pressure loader arranged on the frame, an air-powder mixer arranged below the negative pressure loader, a Roots vacuum pump connected to the air inlet end of the air-powder mixer, a connecting pipe connected to the output end of the Roots vacuum pump, and a sulfur dioxide sensor installed in the kiln tail pipeline, one end of the connecting pipe extends into the kiln tail pipeline, the discharge end of the negative pressure loader is connected to the powder inlet of the air-powder mixer, and the negative pressure loader, the Roots vacuum pump and the sulfur dioxide sensor are all electrically connected to the controller.
[0006] Furthermore, the connecting pipe includes a main pipe with one end connected to the output end of the Roots vacuum pump, a diverter connected to the other end of the main pipe, a diverter pipe connected to the diverter at one end, and the diverter pipe extends into the kiln tail pipe at one end away from the diverter and is installed through a bracket.
[0007] Furthermore, the diversion pipe extends into the kiln tail pipe to a depth of not less than 30 cm.
[0008] Furthermore, a plug is provided at one end of the diversion pipe extending into the kiln tail pipe, and a plurality of air holes are radially provided on the diversion pipe, and the air holes communicate with the interior of the kiln tail pipe and the interior of the diversion pipe.
[0009] Furthermore, the outer diameter of the diversion pipe is one third of the inner diameter of the kiln tail pipe.
[0010] Furthermore, the sulfur dioxide sensor is arranged close to the gas outlet end of the kiln tail pipe.
[0011] The beneficial effects of the utility model are:
[0012] In actual application, when used, the sulfur dioxide concentration in the kiln tail pipe is monitored in real time through the sulfur dioxide sensor. When the sulfur dioxide concentration in the kiln tail pipe is too high, the negative pressure feeder injects desulfurization powder into the gas-powder mixer, and at the same time, the Roots vacuum pump injects airflow into the gas-powder mixer. After the desulfurization powder and the airflow are mixed into a dust airflow in the gas-powder mixer, they are sprayed into the kiln tail pipe through the connecting pipe, so that the sulfur dioxide concentration in the kiln tail pipe is rapidly reduced. The utility model can quickly reduce the sulfur dioxide emission value in the kiln tail flue gas in a short time, avoid the occurrence of periodic sulfur exceeding the standard and more serious ammonia escape, reduce the desulfurization cost per ton of clinker, and avoid the risk of environmental protection penalties due to exceeding the emission standard, making the operation of the cement kiln system safer and more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0014] Figure 2 It is a right side view of the utility model;
[0015] Figure 3 It is a top view of the utility model;
[0016] Figure 4 This is a schematic diagram of the structure of the kiln tail pipe and the diversion pipe in the utility model;
[0017] Reference numerals: frame 1; negative pressure loader 2; gas-powder mixer 3; Roots vacuum pump 4; connecting pipe 5; main pipeline 51; branch pipeline 52; air hole 521; bracket 53; plug 54; sulfur dioxide sensor 6; kiln tail pipeline 7. DETAILED DESCRIPTION
[0018] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a kiln tail flue gas desulfurization system includes a frame 1, a controller arranged on the frame 1, a negative pressure feeder 2 arranged on the frame 1, an air-powder mixer 3 arranged below the negative pressure feeder 2, a Roots vacuum pump 4 connected to the air inlet end of the air-powder mixer 3, a connecting pipe 5 connected to the output end of the Roots vacuum pump 4, and a sulfur dioxide sensor 6 installed in the kiln tail pipe 7, one end of the connecting pipe 5 extends into the kiln tail pipe 7, the discharge end of the negative pressure feeder 2 is connected to the powder inlet of the air-powder mixer 3, and the negative pressure feeder 2, the Roots vacuum pump 4 and the sulfur dioxide sensor 6 are all electrically connected to the controller.
[0019] During use, the sulfur dioxide concentration in the kiln tail pipe 7 is monitored in real time by the sulfur dioxide sensor 6. When the sulfur dioxide concentration in the kiln tail pipe 7 is too high, the negative pressure feeder 2 injects desulfurization powder into the gas-powder mixer 3, and at the same time, the Roots vacuum pump 4 injects airflow into the gas-powder mixer 3. After the desulfurization powder and the airflow are mixed into a dust airflow in the gas-powder mixer 3, the dust airflow is sprayed into the kiln tail pipe 7 through the connecting pipe 5, so that the sulfur dioxide concentration in the kiln tail pipe 7 is rapidly reduced. The utility model can quickly reduce the emission value of sulfur dioxide in the kiln tail flue gas in a short time, avoid the occurrence of periodic sulfur exceeding the standard and more serious ammonia escape, reduce the desulfurization cost per ton of clinker, and avoid the risk of environmental protection penalties due to excessive emissions, making the operation of the cement kiln system safer and more stable.
[0020] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the connecting pipe 5 includes a main pipe 51 connected to the output end of the Roots vacuum pump 4 at one end, a diverter connected to the other end of the main pipe 51, and a diverter pipe 52 connected to the diverter at one end. The diverter pipe 52 extends into the kiln tail pipe 7 at one end away from the diverter and is installed through a bracket 53. In this embodiment, the mixed dust airflow is introduced into the kiln tail pipe 7 through the main pipe 51, the diverter and the diverter pipe 52.
[0021] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the diversion pipe 52 extends into the kiln tail pipe 7 to a depth of not less than 30 cm. In this embodiment, when the diversion pipe 52 extends into the kiln tail pipe 7 to a depth of not less than 30 cm, the contact time between the dust airflow and sulfur dioxide is more sufficient, and the reaction effect is better.
[0022] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a plug 54 is provided at one end of the diversion pipe 52 extending into the kiln tail pipe 7, and a plurality of air holes 521 are radially provided on the diversion pipe 52, and the air holes 521 connect the interior of the kiln tail pipe 7 and the interior of the diversion pipe 52; in this embodiment, the dust airflow in the diversion pipe 52 enters the kiln tail pipe 7 through the air holes 521 to react with sulfur dioxide, and the reaction effect is better.
[0023] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the outer diameter of the diversion pipe 52 is one-third of the inner diameter of the kiln tail pipe 7; in this embodiment, when the outer diameter of the diversion pipe 52 is one-third of the inner diameter of the kiln tail pipe 7, it will not affect the normal exhaust of the kiln tail pipe 7, and can also ensure that the dust airflow can fully contact and react with sulfur dioxide.
[0024] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the sulfur dioxide sensor 6 is arranged close to the gas outlet end of the kiln tail pipe 7; in this embodiment, when the sulfur dioxide sensor 6 is arranged close to the gas outlet end of the kiln tail pipe 7, the sulfur dioxide sensor 6 can detect the sulfur dioxide in the kiln tail pipe 7 more accurately.
[0025] The specific embodiments described herein are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods without departing from the scope of the present invention.
Claims
1. A kiln tail flue gas desulfurization system, characterized by: The invention comprises a frame (1), a controller arranged on the frame (1), a negative pressure feeder (2) arranged on the frame (1), an air-powder mixer (3) arranged below the negative pressure feeder (2), a Roots vacuum pump (4) connected to the air inlet end of the air-powder mixer (3), a connecting pipe (5) connected to the output end of the Roots vacuum pump (4), and a sulfur dioxide sensor (6) installed in a kiln tail pipe (7), one end of the connecting pipe (5) extends into the kiln tail pipe (7), the discharge end of the negative pressure feeder (2) is communicated with the powder inlet of the air-powder mixer (3), and the negative pressure feeder (2), the Roots vacuum pump (4) and the sulfur dioxide sensor (6) are all electrically connected to the controller.
2. A kiln tail flue gas desulfurization system according to claim 1, characterized in that: The connecting pipe (5) includes a main pipe (51) connected to the output end of the Roots vacuum pump (4) at one end, a diverter connected to the other end of the main pipe (51), and a diverter pipe (52) connected to the diverter at one end. The diverter pipe (52) extends into the kiln tail pipe (7) at one end away from the diverter and is installed through a bracket (53).
3. A kiln tail flue gas desulfurization system according to claim 2, characterized in that: The diversion pipe (52) extends into the kiln tail pipe (7) to a depth of not less than 30 cm.
4. A kiln tail flue gas desulfurization system according to claim 2, characterized in that: One end of the diversion pipe (52) extending into the kiln tail pipe (7) is provided with a plug (54), and a plurality of air holes (521) are radially provided on the diversion pipe (52), and the air holes (521) communicate with the interior of the kiln tail pipe (7) and the interior of the diversion pipe (52).
5. The kiln tail flue gas desulfurization system according to claim 2, characterized in that: The outer diameter of the diversion pipe (52) is one third of the inner diameter of the kiln tail pipe (7).
6. A kiln tail flue gas desulfurization system according to claim 2, characterized in that: The sulfur dioxide sensor (6) is arranged close to the gas outlet end of the kiln tail pipe (7).