Double-absorbent dry desulfurization reactor
By designing a dual absorber dry desulfurization reactor, including sodium-based and calcium-based injection sections, and improving mixing uniformity through the Venturi acceleration section, the problem of the inability to switch absorbers online in the prior art is solved, and high flexibility is achieved and low-cost desulfurization effect.
Patent Information
- Application Number
- CN202421179513.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-28
AI Technical Summary
The existing SDS dry desulfurization reactors cannot switch different absorbents freely online, resulting in poor flexibility and high modification costs, affecting normal operation.
A dual absorbent dry desulfurization reactor is designed, including sodium-based and calcium-based injection sections, to improve mixing uniformity through the Venturi acceleration section and to allow for online switching of absorbents.
The ability to flexibly select absorbents according to different flue gas working conditions and absorbent supply conditions is realized, reducing processing costs and improving the economic performance and flexibility of the device.
Smart Images
Figure CN222427617U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of desulfurization, in particular to a double-absorbent dry desulfurization reactor. Background Art
[0002] SDS dry desulfurization is an effective flue gas desulfurization technology with high desulfurization efficiency and wide applicability. It uses adsorbents to adsorb sulfur dioxide in flue gas, which can efficiently and flexibly reduce the sulfur dioxide concentration in flue gas while realizing resource recycling.
[0003] Traditional SDS desulfurization reactors are all single absorbent reactors, mainly including sodium-based desulfurization towers using sodium bicarbonate and calcium-based desulfurization towers using ultrafine calcium hydroxide powder. These two absorbents have their own advantages and disadvantages: sodium-based is more suitable for high pollutant concentrations (usually inlet sulfur dioxide concentration ≤ 1000mg / Nm 3 ) and high flue gas temperature (160℃-250℃), the by-product produced is mainly sodium sulfate, which cannot be recycled, there are few receiving companies, and the cost of solid waste treatment is high. Calcium-based is more suitable for low pollutant concentration (usually inlet sulfur dioxide concentration ≤500mg / Nm 3 ) Under the working conditions of low flue gas temperature (normal temperature -180℃), the by-product produced is mainly calcium sulfate, which can be used as cement retarder. There are many receiving enterprises and the cost of solid waste treatment is low.
[0004] At present, the desulfurization reactor usually needs to determine which absorbent to use during the project construction. If it needs to be changed to another absorbent after completion, the desulfurization reactor needs to be shut down for transformation. The desulfurization absorbent cannot be switched freely online, the flexibility is poor, and the transformation cost is high, which affects the normal operation of the desulfurization reactor. Utility Model Content
[0005] The purpose of the utility model is to provide a dual-absorbent dry desulfurization reactor, which can select different desulfurization absorbents according to different flue gas conditions, absorbent supply conditions, solid waste treatment conditions and other factors, and can also use both sodium-based and calcium-based desulfurization absorbents at the same time, and can freely switch the desulfurization absorbents online, with high flexibility.
[0006] In order to achieve the above-mentioned purpose, the utility model provides a dual-absorbent dry desulfurization reactor, including a reactor body, wherein the reactor body includes an ash discharge port, a sodium-based injection section, a calcium-based injection section and a desulfurization reaction section arranged in sequence from bottom to top, the sodium-based injection section is provided with at least one sodium-based absorbent injection port and a flue inlet, the calcium-based injection section is provided with at least one calcium-based absorbent injection port, and the top of the desulfurization reaction section is provided with a flue outlet.
[0007] Optionally, the reactor body further includes a Venturi acceleration section, wherein the Venturi acceleration section is located between the sodium-based injection section and the calcium-based injection section and connects the sodium-based injection section and the calcium-based injection section.
[0008] Optionally, the Venturi acceleration section includes multiple Venturi acceleration tubes, each of which is connected to the sodium-based injection section and the calcium-based injection section, and the maximum aperture of the Venturi acceleration tube is smaller than the minimum aperture of the sodium-based injection section and the calcium-based injection section.
[0009] Optionally, the plurality of Venturi accelerating tubes are evenly distributed parallel to the vertical direction.
[0010] Optionally, the aperture of the calcium-based injection section increases sequentially from bottom to top.
[0011] Optionally, the ash discharge port is a conical ash hopper, and a gate valve is provided at the bottom of the ash discharge port.
[0012] Optionally, the ash discharge port is provided with a plurality of level meters along the height direction.
[0013] Optionally, the double absorbent dry desulfurization reactor further includes a pressure detection unit, and the pressure detection unit is used to detect the flue gas pressure at the flue inlet and the flue outlet.
[0014] Optionally, the outer wall of the desulfurization reaction section is provided with a plurality of supports.
[0015] The double absorbent dry desulfurization reactor provided by the utility model has at least one of the following beneficial effects:
[0016] 1) By simultaneously arranging the sodium-based injection section and the calcium-based injection section in the reactor body, different desulfurization absorbents can be selected according to different flue gas conditions, absorbent supply conditions, solid waste treatment conditions and other factors. Both sodium-based and calcium-based desulfurization absorbents can also be used at the same time. The reactor body does not need to be shut down for transformation, and the desulfurization absorbent can be freely switched online, which is highly flexible;
[0017] 2) By arranging the calcium-based injection section above the sodium-based injection section, when two desulfurization absorbents are used at the same time, the flue gas is first mixed with the sodium-based desulfurization absorbent, and then the calcium-based desulfurization absorbent is mixed after the pollutant concentration in the flue gas is reduced, thereby effectively reducing the processing cost and improving the economic performance of the device operation.
[0018] 3) By setting a Venturi acceleration section between the sodium-based injection section and the calcium-based injection section, the mixing uniformity of the flue gas and the sodium-based desulfurization absorbent can be improved, and the flue gas mixed with the sodium-based desulfurization absorbent can be accelerated to improve the desulfurization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Those skilled in the art should understand that the drawings provided are for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.
[0020] Figure 1 This is a schematic structural diagram of a double absorbent dry desulfurization reactor provided in one embodiment of the utility model.
[0021] in:
[0022] 1-reactor body; 2-ash discharge port; 3-sodium-based injection section; 4-calcium-based injection section; 5-desulfurization reaction section; 6-sodium-based absorbent injection port; 7-flue inlet; 8-calcium-based absorbent injection port; 9-flue outlet; 10-Venturi acceleration section; 11-gate valve; 12-level meter; 13-pressure transmitter; 14-support; 15-manhole. DETAILED DESCRIPTION
[0023] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail in combination with the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model, and are not used to limit the limiting conditions for the implementation of the utility model. Therefore, they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model.
[0024] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish between the various components, elements, steps, etc. in the specification, rather than to represent the logical relationship or sequential relationship between the various components, elements, steps, etc. Moreover, the terms "comprise", "include", or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device including the element.
[0025] Please refer to Figure 1The present embodiment provides a dual-absorbent dry desulfurization reactor, including a reactor body 1, wherein the reactor body 1 includes an ash discharge port 2, a sodium-based injection section 3, a calcium-based injection section 4 and a desulfurization reaction section 5 arranged in sequence from bottom to top, the sodium-based injection section 3 is provided with at least one sodium-based absorbent injection port 6 and a flue inlet 7, the calcium-based injection section 4 is provided with at least one calcium-based absorbent injection port 8, and the top of the desulfurization reaction section 5 is provided with a flue outlet 9.
[0026] In this embodiment, the flue gas enters the reactor body 1 from the flue inlet 7, then passes through the sodium-based injection section 3, the calcium-based injection section 4 and the desulfurization reaction section 5 in sequence, and finally is discharged from the flue outlet 9 at the top of the desulfurization reaction section 5. By simultaneously arranging the sodium-based injection section 3 and the calcium-based injection section 4 in the reactor body 1, different desulfurization absorbents can be selected according to different flue gas conditions, absorbent supply conditions, and solid waste treatment conditions. It is also possible to use both sodium-based and calcium-based desulfurization absorbents at the same time. There is no need to shut down the reactor body 1 for transformation, and the desulfurization absorbent can be freely switched online, which is highly flexible. In addition, by arranging the calcium-based injection section 4 above the sodium-based injection section 3, when two desulfurization absorbents are used at the same time, the flue gas is first mixed with the sodium-based desulfurization absorbent, and the calcium-based desulfurization absorbent is mixed after the pollutant concentration in the flue gas is reduced, thereby effectively reducing the processing cost and improving the economic performance of the device operation.
[0027] The sodium-based absorbent injection port 6 can be one or more, and can be set according to needs, and the utility model does not limit this. In this embodiment, the sodium-based absorbent injection port 6 is two, one of which is used as a spare injection port. Similarly, the calcium-based absorbent injection port 8 can be one or more, and can be set according to needs, and the utility model does not limit this. In this embodiment, the calcium-based absorbent injection port 8 is two, one of which is used as a spare injection port.
[0028] Preferably, the reactor body 1 further comprises a venturi acceleration section 10, which is located between the sodium-based injection section 3 and the calcium-based injection section 4 and connects the sodium-based injection section 3 and the calcium-based injection section 4. The venturi acceleration section 10 can improve the mixing uniformity of the flue gas and the sodium-based desulfurization absorbent, and can also speed up the flue gas mixed with the sodium-based desulfurization absorbent, thereby improving the desulfurization efficiency.
[0029] In this embodiment, the Venturi acceleration section 10 includes multiple Venturi acceleration tubes, each of which is connected to the sodium-based injection section 3 and the calcium-based injection section 4, and the maximum aperture of the Venturi acceleration tube is smaller than the minimum aperture of the sodium-based injection section 3 and the calcium-based injection section 4.
[0030] Preferably, the plurality of Venturi acceleration tubes are evenly distributed parallel to the vertical direction to ensure that the flue gas mixed with the sodium base can enter the calcium base injection section 4 more evenly.
[0031] Preferably, the aperture of the calcium-based injection section 4 increases sequentially from bottom to top to improve the mixing uniformity of the flue gas and the calcium-based.
[0032] Preferably, the ash discharge port 2 is a conical ash hopper, and a gate valve 11 is provided at the bottom of the ash discharge port 2.
[0033] It should be understood that the outlet of the ash discharge port 2 can be equipped with a star-shaped ash discharge valve, a crusher, a humidifier, etc. as needed to meet the needs of different transportation equipment such as trucks, suction pressure tank trucks or silo pumps. The utility model does not impose any restrictions on this.
[0034] Preferably, a manhole 5 is also provided at the ash discharge port 2 to facilitate manual ash cleaning or maintenance by relevant personnel.
[0035] Preferably, the ash discharge port 2 is provided with a plurality of level gauges 12 along the height direction, which are used to detect the material level in the ash discharge port 2, so as to facilitate ash discharge. In this embodiment, there are three level gauges 12, which are arranged in sequence along the height direction, and are used for low material level alarm, high material level alarm and high-high material level alarm respectively.
[0036] Furthermore, the double absorbent dry desulfurization reactor also includes a pressure detection unit, which is used to detect the flue gas pressure at the flue inlet 7 and the flue outlet 9. By comparing the flue gas pressure at the flue inlet 7 and the flue outlet 9, it can reflect whether there is an abnormality inside the reactor body 1, such as whether the venturi acceleration tube is blocked, so as to ensure the safe and stable operation of the desulfurization reactor. In this embodiment, the pressure detection unit includes two pressure transmitters 13, and the two pressure transmitters 13 are used to detect the flue gas pressure at the flue inlet 7 and the flue outlet 9 respectively.
[0037] In this embodiment, the outer wall of the desulfurization reaction section 5 is provided with a plurality of supports 14, which can be used in conjunction with a bracket and are mainly used to install and support the reactor body 1. The support 14 can be one, for example, a circular support 14 arranged around the circumference of the reactor body 1, or a plurality of point supports 14 evenly distributed along the circumference of the reactor body 1, and the utility model does not limit this.
[0038] In summary, the embodiment of the utility model provides a dual-absorbent dry desulfurization reactor. By simultaneously arranging the sodium-based injection section 3 and the calcium-based injection section 4 in the reactor body 1, different desulfurization absorbents can be selected according to factors such as different flue gas conditions, absorbent supply conditions, and solid waste treatment conditions. Both sodium-based and calcium-based desulfurization absorbents can also be used at the same time. There is no need to shut down the reactor body 1 for modification, and the desulfurization absorbent can be freely switched online, which is highly flexible. In addition, by arranging the calcium-based injection section 4 above the sodium-based injection section 3, when two desulfurization absorbents are used at the same time, the flue gas is first mixed with the sodium-based desulfurization absorbent, and the calcium-based desulfurization absorbent is mixed after the pollutant concentration in the flue gas is reduced, thereby effectively reducing the processing cost and improving the economic performance of the device operation.
[0039] In addition, it should be recognized that although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the above disclosed technical content can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.
Claims
1. A double absorbent dry desulfurization reactor, characterized in that: The reactor body comprises an ash discharge port, a sodium-based injection section, a calcium-based injection section and a desulfurization reaction section which are arranged in sequence from bottom to top; the sodium-based injection section is provided with at least one sodium-based absorbent injection port and a flue inlet; the calcium-based injection section is provided with at least one calcium-based absorbent injection port; and a flue outlet is provided at the top of the desulfurization reaction section.
2. The double absorbent dry desulfurization reactor according to claim 1, characterized in that: The reactor body further comprises a Venturi acceleration section, which is located between the sodium-based injection section and the calcium-based injection section and connects the sodium-based injection section and the calcium-based injection section.
3. The double absorbent dry desulfurization reactor according to claim 2, characterized in that: The Venturi acceleration section includes a plurality of Venturi acceleration tubes, each of which is connected to the sodium-based injection section and the calcium-based injection section respectively, and the maximum aperture of the Venturi acceleration tube is smaller than the minimum aperture of the sodium-based injection section and the calcium-based injection section.
4. The double absorbent dry desulfurization reactor according to claim 3, characterized in that: The plurality of Venturi accelerating tubes are evenly distributed parallel to the vertical direction.
5. The double absorbent dry desulfurization reactor according to claim 1, characterized in that: The aperture of the calcium-based injection section increases sequentially from bottom to top.
6. The double absorbent dry desulfurization reactor according to claim 1, characterized in that: The ash discharge port is a conical ash hopper, and a plug valve is arranged at the bottom of the ash discharge port.
7. The double absorbent dry desulfurization reactor according to claim 1 or 6, characterized in that: The ash discharge port is provided with a plurality of material level meters along the height direction.
8. The double absorbent dry desulfurization reactor according to claim 1, characterized in that: The double absorbent dry desulfurization reactor further comprises a pressure detection unit, and the pressure detection unit is used to detect the flue gas pressure at the flue inlet and the flue outlet.
9. The double absorbent dry desulfurization reactor according to claim 1, characterized in that: The outer wall of the desulfurization reaction section is provided with a plurality of supports.