A dry desulfurization system for desulfurization agent recovery and utilization

Abstract

This invention proposes a dry desulfurization system for desulfurizing agent recovery and utilization, comprising a desulfurization reactor, a desulfurizing agent storage and transportation unit, a dust removal unit, a desulfurizing agent recovery and utilization unit, and a flue gas exhaust unit. The inlet flue of the desulfurization reactor is connected to the desulfurizing agent storage and transportation unit, the industrial furnace exhaust port, and the desulfurizing agent recovery and utilization unit, respectively. The outlet of the desulfurization reactor is connected to the inlet of the dust removal unit through a pipeline. The ash hopper discharge port of the dust removal unit is connected to the chimney through a flue gas exhaust pipe. The desulfurizing agent recovery and utilization unit is connected to both the dust removal unit and the desulfurization reactor. This invention effectively improves the utilization rate of the desulfurizing agent, reduces the consumption of desulfurizing agent, and reduces operating costs.

Description

Technical Field

[0001] This application relates to the technical field of flue gas desulfurization, and more specifically, to a dry desulfurization system for the recovery and reuse of desulfurizing agents. Background Technology

[0002] Steel rolling heating furnaces generate harmful substances such as dust, SO2, and NOx during the production process, causing environmental pollution.

[0003] Existing desulfurization technologies are mainly classified into wet flue gas desulfurization, dry flue gas desulfurization, and semi-dry flue gas desulfurization according to their process characteristics. Among them, dry desulfurization is simple to operate and has a lower investment cost. The dry process mainly uses a fluidized bed with adsorbent to spray flue gas in a countercurrent or cocurrent manner to complete desulfurization. At present, the adsorbent in mature processes is mainly lime (calcium-based), and its adsorption desulfurization efficiency is generally around 80%. However, dry desulfurization has a large calcium-to-sulfur ratio, low reaction efficiency, and a large amount of fresh desulfurizing agent remains unreacted in the collected dust, resulting in low utilization of the desulfurizing agent. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a dry desulfurization system for recycling desulfurizing agent, which improves the recycling rate of desulfurizing agent by setting a desulfurizing agent circulation fan at the bottom of the by-product silo.

[0005] The embodiments of this application are implemented as follows:

[0006] This application provides a dry desulfurization system for desulfurizing agent recovery and utilization, characterized in that it includes a desulfurization reactor, a desulfurizing agent storage and transportation unit, a dust removal unit, a desulfurizing agent recovery and utilization unit, and a flue gas exhaust unit. The inlet flue of the desulfurization reactor is connected to the desulfurizing agent storage and transportation unit, the industrial furnace exhaust port, and the desulfurizing agent recovery and utilization unit, respectively. The outlet of the desulfurization reactor is connected to the inlet of the dust removal unit through a pipeline. The ash hopper discharge port of the dust removal unit is connected to the chimney through a flue gas exhaust pipe. The desulfurizing agent recovery and utilization unit is connected to both the dust removal unit and the desulfurization reactor.

[0007] In some optional implementations, the desulfurizing agent recovery unit includes a pneumatic ash conveying mechanism and a by-product silo mechanism. The pneumatic ash conveying mechanism is connected to the ash hopper discharge port of the dust removal unit and the inlet of the by-product silo mechanism, respectively. The outlet of the by-product silo mechanism is connected to the desulfurization reactor and the by-product suction and discharge vehicle, respectively.

[0008] In some alternative implementations, the pneumatic ash conveying mechanism includes a compressed air tank and a silo pump. The inlet of the silo pump is connected to the ash hopper discharge port of the dust removal unit, and the outlet of the silo pump is connected to the by-product silo mechanism via an ash conveying pipeline. The compressed air tank is connected to the ash conveying pipeline.

[0009] In some optional embodiments, the by-product storage mechanism includes a by-product storage chamber, which is provided with a desulfurizing agent recovery discharge port and an ash discharge port. The desulfurizing agent recovery discharge port is connected to the inlet of the desulfurizing agent recovery injector acceleration chamber through a desulfurizing agent recovery pipe, and the outlet of the desulfurizing agent recovery injector acceleration chamber is connected to the front inlet flue. The ash discharge port is connected to the by-product suction and discharge vehicle through an ash discharge pipe.

[0010] In some optional implementations, the desulfurizing agent storage and transportation unit includes a desulfurizing agent raw material silo. The bottom of the desulfurizing agent raw material silo is provided with two desulfurizing agent discharge ports. Each desulfurizing agent discharge port is connected to the inlet of the desulfurizing agent injector acceleration chamber through a discharge pipe. The outlet of the desulfurizing agent injector acceleration chamber is connected to the front inlet flue.

[0011] In some alternative implementations, the desulfurization reactor includes an inner cylinder and an outer cylinder, the inner cylinder being a venturi tube structure, the front inlet flue of the desulfurization reactor being connected to the inlet of the inner cylinder, and the exhaust port of the outer cylinder being connected to the dust removal unit.

[0012] In some alternative implementations, the dust removal unit is a bag filter, which is divided into multiple clean air chamber units according to design requirements.

[0013] In some alternative implementations, the desulfurizing agent recovery injector acceleration chamber is connected to the desulfurizing agent circulation fan via a duct, and the desulfurizing agent injector acceleration chamber is connected to the desulfurizing agent delivery fan via a duct.

[0014] In some optional implementations, a manual slide gate valve and a rotary discharge valve are provided below the desulfurizing agent recovery discharge port and the desulfurizing agent discharge port.

[0015] In some optional implementations, both the desulfurizing agent circulating fan and the desulfurizing agent conveying fan are Roots blowers, and an exhaust fan is installed on the exhaust duct.

[0016] The beneficial effects of this application are: This application provides a dry desulfurization system for desulfurizing agent recycling, which sets up a desulfurizing agent recycling unit and combines a desulfurizing agent circulation fan at the bottom of the by-product silo to enhance the recycling rate of the desulfurizing agent. Under the premise of meeting ultra-low emission standards, it effectively improves the utilization rate of the desulfurizing agent, reduces the consumption of desulfurizing agent, and reduces operating costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the distribution of a dry desulfurization system according to an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0024] like Figure 1As shown, a dry desulfurization system for desulfurizing agent recovery and utilization includes a desulfurization reactor 1, a desulfurizing agent storage and transportation unit, a dust removal unit, a desulfurizing agent recovery and utilization unit, and a flue gas exhaust unit. The inlet flue of the desulfurization reactor is connected to the desulfurizing agent storage and transportation unit, the industrial furnace exhaust port, and the desulfurizing agent recovery and utilization unit, respectively. The outlet of the desulfurization reactor is connected to the inlet of the dust removal unit through a pipe. The ash hopper discharge port of the dust removal unit is connected to the chimney 2 through a flue gas exhaust pipe. A flue gas exhaust fan 3 is installed on the flue gas exhaust pipe. The desulfurizing agent recovery and utilization unit is connected to both the dust removal unit and the desulfurization reactor.

[0025] The desulfurizing agent recovery and utilization unit includes a pneumatic ash conveying mechanism and a by-product silo mechanism. The pneumatic ash conveying mechanism is connected to the ash hopper discharge port of the dust removal unit and the inlet of the by-product silo mechanism, respectively. The outlet of the by-product silo mechanism is connected to the desulfurization reactor and the by-product suction and discharge vehicle, respectively.

[0026] Furthermore, the pneumatic ash conveying mechanism includes a compressed air storage tank 4 and a silo pump 5. The inlet of the silo pump is connected to the ash hopper discharge port of the dust removal unit, and the outlet of the silo pump is connected to the by-product silo mechanism through an ash conveying pipeline. The compressed air tank is also connected to the ash conveying pipeline. Dry desulfurization has a high calcium-to-sulfur ratio and low reaction efficiency, resulting in a large amount of unreacted fresh desulfurizing agent remaining in the collected dust. The dust removal unit is a bag filter, divided into multiple clean air chamber units according to design requirements. During operation, unreacted desulfurizing agent and desulfurization by-products are evenly distributed on the surface of the filter bags, filling the surface with unreacted desulfurizing agent. Simultaneously, the filtration velocity of the bag filter is selected to be ≤0.7 Nm. 3 The low flue gas velocity ( / min) and long reaction time further improve reaction efficiency. Simultaneously, the flue gas undergoes filtration and dust removal by a bag filter, meeting the ultra-low emission standard of ≤10mg / Nm³ for dust content at the bag filter outlet. 3 Requirements.

[0027] Furthermore, the by-product storage mechanism includes a by-product storage 6, which is equipped with a desulfurizing agent recovery discharge port 7 and an ash discharge port 8. The desulfurizing agent recovery discharge port is connected to the inlet of the acceleration chamber of the desulfurizing agent recovery injector 9 via a desulfurizing agent recovery pipe. The outlet of the acceleration chamber of the desulfurizing agent recovery injector is connected to the front inlet flue. The ash discharge port is connected to the by-product suction and discharge vehicle 10 via an ash discharge pipe. The acceleration chamber of the desulfurizing agent recovery injector is connected to the desulfurizing agent circulation fan 11 via a duct to enhance the recycling rate of the desulfurizing agent and reduce the loss rate.

[0028] Furthermore, the desulfurizing agent storage and transportation unit includes a desulfurizing agent raw material silo 12. Two desulfurizing agent discharge ports 13 are provided at the bottom of the desulfurizing agent raw material silo. Each desulfurizing agent discharge port is connected to the inlet of the desulfurizing agent injector 14 acceleration chamber through a discharge pipe. The outlet of the desulfurizing agent injector acceleration chamber is connected to the front inlet flue. The desulfurizing agent injector acceleration chamber is connected to the desulfurizing agent conveying fan 15 through a duct.

[0029] Two discharge ports were designed, with each discharge port corresponding to a desulfurizing agent conveying fan. One desulfurizing agent conveying fan was in use and the other was on standby. The design features automatic switching and interlocking control, which can effectively avoid the risk of equipment failure and shutdown.

[0030] Furthermore, the desulfurization reactor includes an inner cylinder and an outer cylinder. The inner cylinder has a venturi tube structure. The front inlet flue of the desulfurization reactor is connected to the inlet of the inner cylinder, and the exhaust port of the outer cylinder is connected to the dust removal unit.

[0031] The desulfurization reactor adopts an inner and outer sleeve design to optimize the footprint, achieving a longer flue gas flow and a longer reaction residence time within a limited space. Furthermore, through internal Venturi design and flow field simulation, the optimal structural design is selected to ensure more uniform mixing of the desulfurizing agent and flue gas, resulting in higher reaction efficiency.

[0032] Furthermore, both the desulfurizer recovery discharge port and the area below the desulfurizer discharge port are equipped with manual slide gate valves and rotary discharge valves. The rotary discharge valve is frequency-controlled, which can automatically adjust the circulation volume according to the operating conditions, optimize the amount of fresh desulfurizer used to the maximum extent, and reduce operating costs.

[0033] Furthermore, both the desulfurizing agent circulating fan and the desulfurizing agent conveying fan are Roots blowers.

[0034] The desulfurizing agent is first injected through a desulfurizing agent injector into the inner cylinder of the desulfurization reactor. Industrial furnace flue gas also enters the inner cylinder, where it is accelerated and mixed with the desulfurizing agent via a venturi tube. The flue gas then flows from the inner cylinder into the outer cylinder, finally entering a bag filter for dust collection. After being pressurized by an exhaust fan, it is discharged through a chimney. Unreacted desulfurizing agent is collected by a silo pump and enters a by-product silo, where it is recycled back into the desulfurization reactor via a desulfurizing agent recovery injector. The by-products after the reaction are periodically transported and disposed of using a suction truck, depending on the on-site operating conditions.

Claims

1. A dry desulfurization system for recycling a desulfurizer, characterized by, The system includes a desulfurization reactor, a desulfurizing agent storage and transportation unit, a dust removal unit, a desulfurizing agent recovery and utilization unit, and a flue gas exhaust unit. The inlet flue of the desulfurization reactor is connected to the desulfurizing agent storage and transportation unit, the industrial furnace exhaust port, and the desulfurizing agent recovery and utilization unit. The outlet of the desulfurization reactor is connected to the inlet of the dust removal unit through a pipeline. The ash hopper discharge port of the dust removal unit is connected to the chimney through a flue gas exhaust pipe. The desulfurizing agent recovery and utilization unit is connected to both the dust removal unit and the desulfurization reactor.

2. The dry desulphurization system for recycling of a desulphurizer according to claim 1, characterized in that, The desulfurizing agent recovery and utilization unit includes a pneumatic ash conveying mechanism and a by-product silo mechanism. The pneumatic ash conveying mechanism is connected to the ash hopper discharge port of the dust removal unit and the inlet of the by-product silo mechanism, respectively. The outlet of the by-product silo mechanism is connected to the desulfurization reactor and the by-product suction and discharge vehicle, respectively.

3. The dry desulfurization system for desulfurizing agent recovery and utilization according to claim 2, characterized in that, The pneumatic ash conveying mechanism includes a compressed air storage tank and a silo pump. The inlet of the silo pump is connected to the ash hopper discharge port of the dust removal unit, and the outlet of the silo pump is connected to the by-product silo mechanism through an ash conveying pipeline. The compressed air storage tank is connected to the ash conveying pipeline.

4. A dry desulfurization system for desulfurizing agent recovery and utilization according to claim 3, characterized in that, The by-product storage mechanism includes a by-product storage chamber, which is equipped with a desulfurizing agent recovery discharge port and an ash discharge port. The desulfurizing agent recovery discharge port is connected to the inlet of the desulfurizing agent recovery injector acceleration chamber through a desulfurizing agent recovery pipeline. The outlet of the desulfurizing agent recovery injector acceleration chamber is connected to the front inlet flue. The ash discharge port is connected to the by-product suction and discharge vehicle through an ash discharge pipeline.

5. A dry desulfurization system for desulfurizing agent recovery and utilization according to claim 4, characterized in that, The desulfurizing agent storage and transportation unit includes a desulfurizing agent raw material silo. Two desulfurizing agent discharge ports are provided at the bottom of the desulfurizing agent raw material silo. Each desulfurizing agent discharge port is connected to the inlet of the desulfurizing agent injector acceleration chamber through a discharge pipe. The outlet of the desulfurizing agent injector acceleration chamber is connected to the front inlet flue.

6. A dry desulfurization system for desulfurizing agent recovery and utilization according to claim 5, characterized in that, The desulfurization reactor includes an inner cylinder and an outer cylinder. The inner cylinder has a venturi tube structure. The inlet flue of the desulfurization reactor is connected to the inlet of the inner cylinder. The exhaust port of the outer cylinder is connected to the dust removal unit.

7. A dry desulfurization system for desulfurizing agent recovery and utilization according to claim 3 or 6, characterized in that, The dust removal unit is a bag filter, which is divided into multiple clean air chamber units according to design requirements.

8. A dry desulfurization system for desulfurizing agent recovery and utilization according to claim 6, characterized in that, The desulfurizing agent recovery injector acceleration chamber is connected to the desulfurizing agent circulation fan via a duct, and the desulfurizing agent injector acceleration chamber is connected to the desulfurizing agent conveying fan via a duct.

9. A dry desulfurization system for desulfurizing agent recovery and utilization according to claim 5 or 8, characterized in that, Both the desulfurizing agent recovery discharge port and the desulfurizing agent discharge port are equipped with manual slide gate valves and rotary discharge valves.

10. A dry desulfurization system for desulfurizing agent recovery and utilization according to claim 8, characterized in that, Both the desulfurizing agent circulating fan and the desulfurizing agent conveying fan are Roots blowers, and the exhaust duct is equipped with an exhaust fan.

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