Flue gas desulfurization and denitrification purification system

Abstract

The utility model relates to a flue gas desulfurization and denitrification purification system which comprises a desulfurization tower, a denitrification tower and a desorption tower, and the desulfurization tower and the denitrification tower are sequentially communicated along a flue gas flowing direction, so that flue gas sequentially passes through the desulfurization tower and the denitrification tower; a discharge port of the desorption tower is connected with a feed port of the desulfurization tower and a feed port of the denitration tower through a first conveying mechanism and used for conveying active coke to the desulfurization tower and the denitration tower, and a discharge port of the denitration tower is connected with the feed port of the desulfurization tower through a second conveying mechanism. And a discharge port of the desulfurization tower is connected with a feed port of the desorption tower through a third conveying mechanism. According to the utility model, the denitrated active coke is conveyed to the desulfurization tower, so that the utilization rate of the active coke is improved, the idling of the denitrated active coke is avoided, and the denitrated active coke is conveyed to the desulfurization tower instead of being mixed with the active coke at the outlet of the desulfurization tower and then enters the desorption tower, so that the total circulation volume of the active coke is reduced, and the abrasion consumption of the active coke is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial waste gas treatment, in particular to a flue gas desulfurization and denitrification purification system. Background Art

[0002] According to the Opinions on Promoting the Implementation of Ultra-low Emissions in the Steel Industry (Environmental Atmosphere (2019) No. 35), under the condition of a baseline oxygen content of 16%, the hourly average emission concentrations of particulate matter, sulfur dioxide, and nitrogen oxides in the sintering machine head flue gas shall not exceed 10, 35, and 50 mg / m3, respectively. The sintering flue gas volume is large and the initial flue gas temperature is low. Since the integrated process of activated coke desulfurization and denitrification can simultaneously desulfurize, denitrify, and remove dust, it does not need to heat the flue gas. This process has been widely used in the treatment of sintering flue gas in the steel industry.

[0003] Patent CN109433012A discloses an asynchronous cycle flue gas purification device and method for desulfurization and denitration activated coke. The activated coke is respectively delivered to the desulfurization unit and the denitration unit through a conveyor belt. After desulfurization / desnitration, the activated coke directly enters the regeneration device and the activated coke is recycled. The cycles of activated coke in the desulfurization and denitration processes are relatively independent, so the cycle rates of denitration and desulfurization activated coke are not synchronized. The cycle rate of activated coke in the denitration device can be reduced according to the situation, that is, the cycle amount of activated coke entering the denitration unit and the desulfurization unit is adjusted separately according to actual needs, thereby reducing the wear and consumption of activated coke. In addition, the desulfurization unit includes multiple desulfurization bins, and the denitration unit includes multiple denitration bins. The multiple bins in each unit can be connected in parallel or in series to make the flue gas reaction more sufficient.

[0004] However, in the above-mentioned prior art, the active coke in the analysis tower is transported to the desulfurization tower and the denitrification tower respectively. The active coke at the bottom after desulfurization and denitrification is combined and directly transported to the analysis tower for analysis, but the active coke after denitrification is directly combined with the active coke after desulfurization for analysis, and the desulfurization capacity of the active coke at the outlet of the denitrification tower is not utilized, resulting in idling of the active coke after denitrification and an increase in the amount of active coke transported to the desulfurization tower, which also causes severe wear and tear and high coke consumption. Utility Model Content

[0005] In view of this, it is necessary to provide a flue gas desulfurization and denitrification purification system to solve the technical problems that the desulfurization capacity of the activated coke at the outlet of the denitrification tower in the prior art is not utilized, resulting in idling of the activated coke after denitrification, increased delivery volume of the activated coke in the desulfurization tower, and also severe wear and high coke consumption.

[0006] The utility model provides a flue gas desulfurization and denitrification purification system, which comprises a desulfurization tower, a denitrification tower and a desorption tower. The desulfurization tower and the denitrification tower are connected in sequence along the flue gas flow direction so that the flue gas passes through the desulfurization tower and the denitrification tower in sequence. The discharge port of the desorption tower is connected with the feed port of the desulfurization tower and the feed port of the denitrification tower respectively through a first conveying mechanism, which is used for conveying activated coke to the desulfurization tower and the denitrification tower. The discharge port of the denitrification tower is connected with the feed port of the desulfurization tower through a second conveying mechanism, and the discharge port of the desulfurization tower is connected with the feed port of the desulfurization tower through a third conveying mechanism.

[0007] In some embodiments, the first conveying mechanism, the second conveying mechanism and the third conveying mechanism are all Z-type chain bucket conveyors.

[0008] In some embodiments, the desulfurization tower has a first feed port and a second feed port, the first conveying mechanism is connected to the first feed port, and the second conveying mechanism is connected to the second feed port.

[0009] In some embodiments, feed valves are provided at both the first feed port and the second feed port.

[0010] In some embodiments, the first feed inlet and the second feed inlet are both located at the top of the desulfurization tower, and the discharge port of the desulfurization tower is located at the bottom of the desulfurization tower.

[0011] In some embodiments, the air inlet of the desulfurization tower is located at the bottom of the side wall of the desulfurization tower, the exhaust port of the desulfurization tower is located at the top of the side wall of the desulfurization tower, the air inlet of the denitrification tower is located at the bottom of the side wall of the denitrification tower, the exhaust port of the denitrification tower is located at the top of the side wall of the denitrification tower, and the exhaust port of the desulfurization tower is connected to the air inlet of the denitrification tower.

[0012] In some embodiments, the feed inlet of the denitrification tower is located at the top of the denitrification tower, and the discharge port of the denitrification tower is located at the bottom of the denitrification tower.

[0013] In some embodiments, the feed inlet of the denitrification tower and the discharge outlet of the denitrification tower are both provided with valves.

[0014] In some embodiments, the discharge port of the desulfurization tower is provided on a valve.

[0015] In some embodiments, the flue gas desulfurization and denitrification purification system further includes a chimney, and the chimney is connected to the exhaust port of the denitrification tower.

[0016] Compared with the prior art, the utility model provides a flue gas desulfurization and denitrification purification system, in which the desulfurization tower and the denitrification tower are sequentially connected along the flue gas flow direction, so that the flue gas passes through the desulfurization tower and the denitrification tower in sequence, the discharge port of the desulfurization tower is connected with the feed port of the desulfurization tower and the feed port of the denitrification tower respectively through a first conveying mechanism, which is used to convey activated coke to the desulfurization tower and the denitrification tower, the discharge port of the denitrification tower is connected with the feed port of the desulfurization tower through a second conveying mechanism, and the discharge port of the desulfurization tower is connected with the feed port of the denitrification tower through a third conveying mechanism. When in specific use, the sintered raw flue gas enters the desulfurization tower to remove SO2; the desulfurized flue gas then enters the denitrification tower to remove NO X ; The flue gas is purified to meet emission standards, the analytical tower is used to analyze the active coke, and the analyzed active coke is transported to the desulfurization tower and the denitrification tower, the active coke in the desulfurization tower is transported to the analytical tower for analysis, and the active coke in the denitrification tower is transported to the desulfurization tower for desulfurization, the active coke for desulfurization comes from the analytical coke in the analytical tower and the active coke in the denitrification tower respectively, the desulfurization tower, the denitrification tower and the analytical tower form an active coke synchronous cycle, the analyzed active coke from the analytical tower is transported to the desulfurization tower and the denitrification tower, the desulfurization tower, the denitrification tower and the analytical tower form a synchronous cycle of active coke, the analyzed active coke from the analytical tower is transported to the desulfurization tower and the denitrification tower, the desulfurization tower, the denitrification tower and the analytical tower The decomposition tower forms an asynchronous circulation of active coke, so that an asynchronous and synchronous coupled circulation of active coke can be formed, so that the active coke after denitrification is transported to the desulfurization tower again, which improves the utilization rate of active coke and avoids the idling of denitrification active coke, while increasing the SO2 concentration of the decomposition gas, which is beneficial to the acid-making system; and the desulfurization and denitrification processes can be independently controlled, while reducing the transportation volume of the transportation mechanism and reducing the investment cost; the active coke after denitrification is transported to the desulfurization tower again, instead of being mixed with the active coke at the outlet of the desulfurization tower and then going to the decomposition tower, which reduces the total circulation volume of active coke, thereby reducing the wear and consumption of active coke.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the preferred embodiment of the utility model is described in detail as follows with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 This is a structural schematic diagram of an embodiment of a flue gas desulfurization and denitrification purification system provided by the utility model.

[0020] Description of reference numerals:

[0021] 1-desulfurization tower, 2-denitrification tower, 3-analysis tower, 4-first conveying mechanism, 5-second conveying mechanism, 6-third conveying mechanism. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0023] See also Figure 1 The flue gas desulfurization and denitrification purification system includes a desulfurization tower 1, a denitrification tower 2 and a desorption tower 3. The desulfurization tower 1 and the denitrification tower 2 are connected in sequence along the flue gas flow direction so that the flue gas passes through the desulfurization tower 1 and the denitrification tower 2 in sequence. The discharge port of the desorption tower 3 is connected to the feed port of the desulfurization tower 1 and the feed port of the denitrification tower 2 respectively through a first conveying mechanism 4, which is used to convey activated coke to the desulfurization tower 1 and the denitrification tower 2. The discharge port of the denitrification tower 2 is connected to the feed port of the desulfurization tower 1 through a second conveying mechanism 5, and the discharge port of the desulfurization tower 1 is connected to the feed port of the desorption tower 3 through a third conveying mechanism 6.

[0024] The utility model provides a flue gas desulfurization and denitration purification system, wherein the desulfurization tower 1 and the denitration tower 2 are sequentially connected along the flue gas flow direction, so that the flue gas passes through the desulfurization tower 1 and the denitration tower 2 in sequence, the discharge port of the desulfurization tower 3 is connected with the feed port of the desulfurization tower 1 and the feed port of the denitration tower 2 respectively through a first conveying mechanism 4, and is used to convey activated coke to the desulfurization tower 1 and the denitration tower 2, the discharge port of the denitration tower 2 is connected with the feed port of the desulfurization tower 1 through a second conveying mechanism 5, and the discharge port of the desulfurization tower 1 is connected with the feed port of the denitration tower 3 through a third conveying mechanism 6. When in use, the sintered raw flue gas enters the desulfurization tower 1 to remove SO2; the desulfurized flue gas then enters the denitration tower 2 to remove NO X; The flue gas is purified to meet the emission standards. The analytical tower 3 is used to analyze the active coke, and the analyzed active coke is transported to the desulfurization tower 1 and the denitrification tower 2. The active coke in the desulfurization tower 1 is transported to the analytical tower 3 for analysis, and the active coke in the denitrification tower 2 is transported to the desulfurization tower 1 for desulfurization. The active coke for desulfurization comes from the analytical coke in the analytical tower 3 and the active coke in the denitrification tower 2 respectively. The desulfurization tower 1, the denitrification tower 2 and the analytical tower 3 form an active coke synchronous cycle. The analyzed active coke from the analytical tower 3 is transported to the desulfurization tower 1 and the denitrification tower 2. Tower 2 and the analysis tower 3 form an asynchronous cycle of active coke, so that an asynchronous and synchronous coupled cycle of active coke can be formed, so that the active coke after denitrification is transported to the desulfurization tower 1, which improves the utilization rate of active coke and avoids the idling of denitrified active coke. At the same time, the SO2 concentration of the analysis gas is increased, which is beneficial to the acid-making system; and the desulfurization and denitrification processes can be independently controlled, while reducing the transportation volume of the transportation mechanism and reducing the investment cost; the active coke after denitrification is transported to the desulfurization tower 1, instead of being mixed with the active coke at the outlet of the desulfurization tower 1 and then going to the analysis tower 3, which reduces the total circulation volume of active coke, thereby reducing the wear and consumption of active coke.

[0025] Further, the specific forms of the first conveying mechanism 4, the second conveying mechanism 5 and the third conveying mechanism 6 are not limited, as long as they can convey the activated coke. In this embodiment, the first conveying mechanism 4, the second conveying mechanism 5 and the third conveying mechanism 6 are all Z-type chain bucket machines. The Z-type chain bucket machine has good sealing performance and can prevent smoke from overflowing therefrom. In some other implementations, the first conveying mechanism 4, the second conveying mechanism 5 and the third conveying mechanism 6 are all screw conveyors.

[0026] Furthermore, the first conveying mechanism 4 can convey activated coke into the desulfurization tower 1, and the second conveying mechanism 5 can also convey activated coke into the desulfurization tower 1. Therefore, in this embodiment, the desulfurization tower 1 has a first feed port and a second feed port, the first conveying mechanism 4 is connected to the first feed port, and the second conveying mechanism 5 is connected to the second feed port.

[0027] Furthermore, in order to control the delivery amount, in this embodiment, a feed valve is provided at both the first feed inlet and the second feed inlet, and the input amount of the activated coke can be controlled by the feed valve.

[0028] Furthermore, the first feed inlet and the second feed inlet are both located at the top of the desulfurization tower 1 , and the discharge port of the desulfurization tower 1 is located at the bottom of the desulfurization tower 1 .

[0029] Furthermore, the air inlet of the desulfurization tower 1 is located at the bottom of the side wall of the desulfurization tower 1, the exhaust port of the desulfurization tower 1 is located at the top of the side wall of the desulfurization tower 1, the air inlet of the denitrification tower 2 is located at the bottom of the side wall of the denitrification tower 2, the exhaust port of the denitrification tower 2 is located at the top of the side wall of the denitrification tower 2, and the exhaust port of the desulfurization tower 1 is connected to the air inlet of the denitrification tower 2.

[0030] Furthermore, the feed inlet of the denitrification tower 2 is located at the top of the denitrification tower 2 , and the discharge port of the denitrification tower 2 is located at the bottom of the denitrification tower 2 .

[0031] Furthermore, the feed inlet of the denitration tower 2 and the discharge port of the denitration tower 2 are both provided with valves.

[0032] Furthermore, the discharge port of the desulfurization tower 1 is arranged on a valve.

[0033] Furthermore, the flue gas desulfurization and denitrification purification system further comprises a chimney, and the chimney is connected to the exhaust port of the denitrification tower 2 .

[0034] It should be noted that the desulfurization tower 1, the denitrification tower 2, the analysis tower 3 and the Z-type chain bucket conveyor are all existing technologies and will not be described in detail here.

[0035] The present application adopts a synchronous and asynchronous coupled cycle of activated coke desulfurization and denitrification. The activated coke cycle in the desulfurization and denitrification processes realizes the coupling of synchronous and asynchronous cycles, so that the desulfurization and denitrification activated coke cycles can be independently controlled, and the desulfurization capacity of the activated coke can be fully utilized.

[0036] Under the premise of meeting the denitration efficiency, the active coke after denitration is transported to the desulfurization tower 1 through a chain bucket conveyor, thereby improving the utilization rate of the active coke, avoiding the idling of the denitration active coke, and increasing the SO2 concentration of the analysis gas, which is beneficial to the acid-making system.

[0037] The present application adopts the method of desulfurizing activated coke first and then denitrifying activated coke. The denitrified activated coke is then transported to the desulfurization tower 1 via a chain bucket conveyor, instead of being mixed with the activated coke at the outlet of the desulfurization tower 1 and then sent to the desorption tower 3, thereby reducing the total circulation amount of the activated coke and thus reducing the wear and tear consumption of the activated coke.

[0038] In the description of this application, it should be noted that when there are directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0039] It should be noted that, in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes, taking "A and / or B" as an example, including scheme A or scheme B or schemes that A and B meet simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas desulfurization and denitrification purification system, characterized in that: It includes a desulfurization tower, a denitrification tower and a desorption tower. The desulfurization tower and the denitrification tower are connected in sequence along the flue gas flow direction so that the flue gas passes through the desulfurization tower and the denitrification tower in sequence. The discharge port of the desorption tower is connected to the feed port of the desulfurization tower and the feed port of the denitrification tower respectively through a first conveying mechanism, which is used to convey activated coke to the desulfurization tower and the denitrification tower. The discharge port of the denitrification tower is connected to the feed port of the desulfurization tower through a second conveying mechanism, and the discharge port of the desulfurization tower is connected to the feed port of the desorption tower through a third conveying mechanism.

2. The flue gas desulfurization and denitrification purification system according to claim 1, characterized in that: The first conveying mechanism, the second conveying mechanism and the third conveying mechanism are all Z-type chain bucket conveyors.

3. The flue gas desulfurization and denitrification purification system according to claim 1, characterized in that: The desulfurization tower has a first feed port and a second feed port, the first conveying mechanism is connected to the first feed port, and the second conveying mechanism is connected to the second feed port.

4. The flue gas desulfurization and denitrification purification system according to claim 3, characterized in that: Feed valves are provided at the first feed inlet and the second feed inlet.

5. The flue gas desulfurization and denitrification purification system according to claim 3, characterized in that: The first feed inlet and the second feed inlet are both located at the top of the desulfurization tower, and the discharge port of the desulfurization tower is located at the bottom of the desulfurization tower.

6. The flue gas desulfurization and denitrification purification system according to claim 1, characterized in that: The air inlet of the desulfurization tower is located at the bottom of the side wall of the desulfurization tower, the exhaust port of the desulfurization tower is located at the top of the side wall of the desulfurization tower, the air inlet of the denitrification tower is located at the bottom of the side wall of the denitrification tower, the exhaust port of the denitrification tower is located at the top of the side wall of the denitrification tower, and the exhaust port of the desulfurization tower is connected to the air inlet of the denitrification tower.

7. The flue gas desulfurization and denitrification purification system according to claim 1, characterized in that: The feed inlet of the denitrification tower is located at the top of the denitrification tower, and the discharge port of the denitrification tower is located at the bottom of the denitrification tower.

8. The flue gas desulfurization and denitrification purification system according to claim 7, characterized in that: The feed inlet of the denitration tower and the discharge outlet of the denitration tower are both provided with valves.

9. The flue gas desulfurization and denitrification purification system according to claim 1, characterized in that: The discharge port of the desulfurization tower is arranged on a valve.

10. The flue gas desulfurization and denitrification purification system according to claim 1, characterized in that: The flue gas desulfurization and denitrification purification system further comprises a chimney, and the chimney is connected to the exhaust port of the denitrification tower.

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