Self-desulfurization system of cement kiln
By preparing Ca(OH)2 desulfurizing agent slurry from carbide slag, the problem of sulfur dioxide emissions in cement production was solved, achieving efficient self-desulfurization and resource reuse, and reducing desulfurization costs.
Patent Information
- Application Number
- CN202520095637.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-16
AI Technical Summary
In the existing cement production process, sulfur dioxide gas is generated during the combustion of sulfides in fuel and raw materials, which leads to environmental pollution. Commonly used desulfurization technologies suffer from high costs or low efficiency.
Desulfurizing agent is prepared using carbide slag. Ca(OH)2 desulfurizing agent slurry is generated through a primary reactor and a secondary reactor. It is then sprayed into the flue gas with a spray gun to react with sulfur dioxide. Combined with a flow meter and a stirring device, the reaction efficiency and uniformity are improved, thus achieving self-desulfurization.
It achieves efficient desulfurization of cement kiln systems, reuses carbide slag, reduces desulfurization costs, and reduces environmental pollution.
Smart Images
Figure CN223788326U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cement kiln desulfurization technology, specifically to a self-desulfurization system for cement kilns. Background Technology
[0002] The fuels and raw materials used in the production of cement clinker usually contain elemental sulfur and sulfur compounds. These sulfur compounds and sulfides generate sulfur dioxide gas during the heating and combustion process in the cement kiln, and the release of sulfur dioxide gas into the atmosphere will cause harm to the environment.
[0003] Currently, the desulfurization technologies commonly used in the cement production industry include: process optimization desulfurization, wet desulfurization, semi-dry desulfurization, and desulfurizing agent desulfurization. Among them, commonly used desulfurizing agents include powder desulfurizing agents and liquid desulfurizing agents. The liquid desulfurizing agent system uses several spray guns arranged on the outlet duct of the secondary cyclone to spray the desulfurizing agent into the duct to achieve separation.
[0004] Calcium carbide slag is the waste residue mainly composed of calcium hydroxide after the hydrolysis of calcium carbide to obtain acetylene gas. The process of producing acetylene from calcium carbide (CaC2) using water (wet process) is simple and mature, and accounts for a large proportion in my country. The production of acetylene gas from 1 ton of calcium carbide with water simultaneously generates 10 tons of industrial waste liquid with a solid content of approximately 12%, commonly known as calcium carbide slag slurry. Calcium carbide slag can be used to replace limestone in cement production, produce quicklime for use as a raw material for calcium carbide, produce chemical products, manufacture building materials, and for environmental remediation. Utility Model Content
[0005] In view of the prior art, this utility model provides a self-desulfurization system for cement kilns, which aims to use carbide slag to prepare desulfurizing agent to achieve desulfurization of cement kiln systems.
[0006] The technical solution of this utility model is as follows:
[0007] A self-desulfurization system for a cement kiln includes a preheating decomposition system, which includes a two-stage cyclone separator and a desulfurizing agent spray gun mounted thereon. The inlet of the desulfurizing agent spray gun is connected to a desulfurizing agent preparation system.
[0008] The desulfurizing agent preparation system includes a feeding device. The discharge port of the feeding device is located below the primary reactor. The primary reactor has a feed port at the top, an atomizing nozzle inside, a water tank connected to the atomizing nozzle outside, and a discharge port at the bottom. A weighing and feeding device is located below the discharge port. A secondary reactor is located below the outlet of the weighing and feeding device. A water inlet pipe is connected to the upper part of the secondary reactor, and a desulfurizing agent outlet is located at the bottom. A conveying device is located downstream of the desulfurizing agent outlet to transport the desulfurizing agent to the preheating and decomposition system via a dispersion device.
[0009] In one specific embodiment, a flow meter is installed on the inlet pipe. The flow meter controls the water flow rate into the secondary reactor; specifically, the flow rate is adjusted based on the results from the weighing and conveying device. Both the weighing sensor and the flow meter of the weighing and conveying device are communicatively connected to the control system. After acquiring data from the weighing sensor, the control system controls the flow meter's opening according to a preset ratio. A sulfur dioxide concentration detector is installed on the secondary cyclone separator and is communicatively connected to the control system. The control system calculates the amount of material entering the secondary reactor based on the sulfur dioxide concentration detector data and a preset calculation model, and uses this calculation to control the discharge port of the primary reactor and the operating status of the weighing and conveying device.
[0010] According to a specific embodiment, both the primary and secondary reactors are equipped with stirring devices. The stirring device includes a stirrer vertically rotatably connected within the primary or secondary reactor and a motor driving the stirrer. The stirring device is used to improve the reaction efficiency of the primary reactor and to enhance the uniformity of the desulfurizing agent slurry mixing in the secondary reactor.
[0011] According to one specific embodiment, the feeding device employs an inclined belt conveyor.
[0012] To reduce the precipitation of Ca(OH)2 in the desulfurizing agent slurry, an insulation layer is installed on the outside of the conveying device to maintain a low temperature. The conveying device can be specifically constructed by connecting a slurry pump and fluid conveying pipelines.
[0013] During operation, calcium carbide slag is fed into the primary reactor via a feeding device, and water is added to the primary reactor through a water tank. The calcium carbide slag reacts with water to generate Ca(OH)2 and acetylene gas. The Ca(OH)2 is weighed by a weighing and feeding device and then transported to the secondary reactor. The water inlet flow rate is adjusted to prepare a desulfurizing agent slurry with a concentration corresponding to sulfur dioxide. The desulfurizing agent slurry is then transported to the preheating and decomposition system by a conveying device. After being dispersed by a dispersion device, it enters the spray guns connected to the cyclone of the secondary preheater. The slurry then enters the flue gas pipeline through the nozzles of the spray guns and reacts with the sulfur dioxide in the pipeline, thus achieving the desulfurization effect.
[0014] The beneficial effects of this utility model are:
[0015] The desulfurizing agent preparation system transforms calcium carbide slag into a desulfurizing agent slurry of suitable concentration through a primary reactor, weighing and conveying device, secondary reactor, and water inlet pipe. This slurry is then used to prepare the desulfurizing agent for cement kiln systems. Furthermore, it enables the reuse of calcium carbide slag waste, conserving resources and reducing desulfurization costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of an embodiment;
[0017] 1. Feeding device; 2. Primary reactor; 3. Weighing and feeding device; 4. Secondary reactor; 5. Water inlet pipe; 6. Conveying device; 7. Dispersing device; 8. Preheating and decomposition system. Detailed Implementation
[0018] The technical means adopted to achieve the intended purpose of this utility model will be further described below with reference to the accompanying drawings of the embodiments of this utility model.
[0019] See Figure 1 As shown, a self-desulfurization system for a cement kiln includes a preheating decomposition system 8, which includes a two-stage cyclone separator and a desulfurizing agent spray gun mounted thereon. The inlet of the desulfurizing agent spray gun is connected to a desulfurizing agent preparation system.
[0020] The desulfurizing agent preparation system includes a feeding device 1. The discharge port of the feeding device 1 is located below the primary reactor 2. The primary reactor 2 has a feed port at the top, an atomizing nozzle inside, a water tank connected to the atomizing nozzle outside, and a discharge port at the bottom. A weighing and feeding device 3 is located below the discharge port. A secondary reactor 4 is located below the outlet of the weighing and feeding device 3. A water inlet pipe 5 is connected to the upper part of the secondary reactor 4, and a desulfurizing agent outlet is located at the bottom. A conveying device 6 is located downstream of the desulfurizing agent outlet to convey the desulfurizing agent to the preheating decomposition system 8 via a dispersion device 7.
[0021] In one specific embodiment, a flow meter is installed on the inlet pipe 5. The flow meter controls the water inlet flow of the secondary reactor 4. Specifically, the water inlet flow is adjusted based on the results of the weighing and conveying device 6. Both the weighing sensor and the flow meter of the weighing and conveying device 6 are communicatively connected to the control system. After acquiring the data from the weighing sensor, the control system controls the opening of the flow meter according to a preset ratio. A sulfur dioxide concentration detector is installed on the secondary cyclone separator and is communicatively connected to the control system. The control system calculates the amount of material entering the secondary reactor 4 based on the data from the sulfur dioxide concentration detector and a preset calculation model, and uses this to control the discharge port of the primary reactor 2 and the operating status of the weighing and conveying device 3.
[0022] According to a specific embodiment, both the primary reactor 2 and the secondary reactor 4 are equipped with stirring devices. The stirring device includes a stirrer vertically rotatably connected within the primary reactor 2 or the secondary reactor 4, and a motor driving the stirrer to rotate. The stirring device is used to improve the reaction efficiency of the primary reactor 2 and to improve the uniformity of the desulfurizing agent slurry mixing within the secondary reactor 4.
[0023] According to a specific embodiment, the feeding device 1 adopts an inclined belt conveyor.
[0024] To reduce the precipitation of Ca(OH)2 in the desulfurizing agent slurry, the conveying device 6 is equipped with an external insulation layer to maintain a relatively low temperature. The conveying device 6 can be specifically constructed by connecting a slurry pump and fluid conveying pipelines.
[0025] During operation, calcium carbide slag is fed into the primary reactor 2 through the feeding device 1, and water is added to the primary reactor 2 through the water tank, causing the calcium carbide slag to react with water to generate Ca(OH)2 and acetylene gas. The Ca(OH)2 is weighed by the weighing and feeding device 3 and then transported to the secondary reactor 4. The water inlet flow rate is adjusted in conjunction with the water inlet pipe 5 to prepare a desulfurizing agent slurry with a sulfur dioxide concentration corresponding to the concentration. Then, the desulfurizing agent slurry is transported to the preheating decomposition system 8 by the conveying device 6. Specifically, after being dispersed by the dispersing device 7, it enters the spray guns connected to the cyclone of the secondary preheater. The spray gun nozzles enter the flue gas pipeline, where it reacts with the sulfur dioxide in the pipeline, thus achieving the desulfurization effect.
[0026] The above description represents a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, all variations, equivalent substitutions, and improvements made without departing from the concept of the present invention should be included within the protection scope of the present invention.
Claims
1. A self-desulphurization system for a cement kiln, comprising a preheating and decomposing system (8) including a two-stage cyclone and a desulfurizer injection lance provided thereon, characterized in that, The desulfurizer spray gun inlet is connected with a desulfurizer preparation system; The desulfurizer preparation system comprises a feeding device (1), a first-stage reaction kettle (2) arranged below the outlet of the feeding device, a feeding inlet arranged at the top of the first-stage reaction kettle, an atomizing nozzle arranged inside the first-stage reaction kettle, a water tank connected with the atomizing nozzle arranged outside the first-stage reaction kettle, an outlet arranged at the lower part of the first-stage reaction kettle, a weighing feeding device (3) arranged below the outlet of the first-stage reaction kettle, a second-stage reaction kettle (4) arranged below the outlet of the weighing feeding device, a water inlet pipe (5) connected with the upper part of the second-stage reaction kettle, a desulfurizer outlet arranged at the lower part of the second-stage reaction kettle, and a conveying device (6) arranged downstream of the desulfurizer outlet for conveying the desulfurizer to a preheating and decomposing system (8) through a dispersing device (7).
2. The self-desulfurizing system according to claim 1, wherein A flow meter is arranged on the water inlet pipe (5).
3. The self-desulfurizing system according to claim 2, wherein A sulfur dioxide concentration detector is arranged on the second-stage cyclone.
4. The self-desulfurizing system according to claim 3, wherein Stirring devices are arranged in the first-stage reaction kettle (2) and the second-stage reaction kettle (4).
5. The self-desulfurizing system according to claim 4, wherein The stirring device comprises a stirrer vertically rotatably connected in the first-stage reaction kettle (2) or the second-stage reaction kettle (4) and a motor for driving the stirrer to rotate.
6. The self-desulfurizing system according to claim 1, wherein The feeding device (1) adopts an inclined belt conveyor.
7. The self-desulfurizing system according to claim 1, wherein An insulating layer is arranged outside the conveying device (6).