Wet flue gas desulfurization oxidation air separation tower adjusting control device

Abstract

The utility model discloses a wet flue gas desulfurization oxidation air separation tower adjusting control device, and belongs to the technical field of environment-friendly flue gas treatment. An oxidation-reduction potential detection assembly is arranged at the bottom of an absorption tower and is connected with an oxidation air regulation and control system, and an oxidation air system is connected with the oxidation air regulation and control system. According to the setting, the oxidation reduction potential detection assembly can transmit an oxidation reduction potential (ORP) value monitored in real time to the oxidation air regulation and control system, and the oxidation air regulation and control system determines regulation information of oxidation air according to a preset ORP range and transmits the regulation information to the regulation valve to regulate the flow of the oxidation air. The method can ensure that the oxidation reduction potential of the slurry in the absorption tower is always maintained in the optimal range, and the ORP value of the slurry in the absorption tower after adjustment is recovered to the normal range, thereby improving the desulfurization efficiency, saving the energy consumption of a fan to the greatest extent, and realizing on-demand matching of the air volume of each absorption tower.

Description

Technical Field

[0001] This utility model belongs to the field of environmental flue gas treatment, and specifically relates to a regulating and control device for a wet flue gas desulfurization oxidation air separation tower. Background Technology

[0002] Wet flue gas desulfurization technology uses limestone slurry as a desulfurizing agent to spray and wash flue gas inside the absorption tower. The limestone slurry reacts with SO2 in the flue gas to generate CaSO3 and CaSO4.

[0003] The wet flue gas desulfurization process can be divided into four stages: absorption, neutralization, oxidation, and crystallization. Among these, the oxidation stage is the core of the desulfurization process, where calcium sulfite is oxidized to calcium sulfate, and a large amount of SO₂ in the slurry is released. 2 3 - Convert to SO 2 4 - This can increase the driving force for SO2 dissolution, causing SO2 to continuously transfer from the gas phase to the liquid phase, and ultimately be converted into usable gypsum. Only when oxidation control is in an optimal state can desulfurization efficiency be improved, ensuring the safe, economical, and energy-saving operation of the system.

[0004] However, there are currently no effective monitoring and control methods for the desulfurization oxidation process, which often results in the oxidation stage of the desulfurization process not being in an optimal state. In addition, in the multi-furnace and multi-tower desulfurization process of the shared oxidation air system, the oxidation air system equipment and air volume between towers cannot be effectively distributed, and even situations such as under-oxidation of slurry and poisoning may occur. Utility Model Content

[0005] To address the aforementioned problems, this utility model proposes a wet flue gas desulfurization oxidation air distribution tower regulation and control device, comprising: an oxidation-reduction potential detection component, an oxidation air system, an oxidation air regulation system, and an oxidation air main pipe;

[0006] The redox potential detection component is installed outside the absorption tower, and the signal output terminal of the redox potential detection component is connected to the signal input terminal of the oxidation air control system.

[0007] The signal output terminal of the oxidation air control system is connected to the signal receiving terminal of the oxidation air system. The oxidation air outlet of the oxidation air system leads to the oxidation air main pipe, and the two outlets of the oxidation air main pipe lead to two absorption towers respectively.

[0008] Furthermore, the redox potential detection component includes a liquid delivery pipeline and a detection probe;

[0009] The liquid delivery pipeline extends from the interface on the absorption tower to the outside of the absorption tower, and the detection probe is installed on the liquid delivery pipeline.

[0010] Further, the absorption tower is provided with an oxidizing air inlet, and the oxidizing air inlet is provided with an air inlet branch pipe, and an air inlet end of the air inlet branch pipe is connected with an outlet end of an oxidizing air main pipe.

[0011] Further, the installation position of the oxidation-reduction potential detection assembly avoids the dead water area and the stirrer installation area of the absorption tower.

[0012] Further, the oxidizing air regulating system comprises a flow meter and a regulating valve, and the flow meter and the regulating valve are arranged on the oxidizing air main pipe.

[0013] The regulating valve is interlocked with the oxidation-reduction potential detection assembly, and is used for adjusting the opening degree of the regulating valve according to the feedback value of the oxidation-reduction potential detection assembly.

[0014] Further, the flow meter is arranged on one side close to the absorption tower, and the regulating valve is arranged on a side away from the absorption tower.

[0015] Further, the oxidizing air system comprises an oxidizing air fan, a gas conveying pipe and a check valve.

[0016] The outlet of each oxidizing air fan is provided with a gas conveying pipe, and the gas conveying pipe is provided with a check valve, and an outlet end of the gas conveying pipe is connected with the oxidizing air main pipe.

[0017] The oxidizing air fan is interlocked with the regulating valve, and is used for adjusting the opening degree of the regulating valve to control the amount of oxidizing air entering the absorption tower when the oxidizing air fan is started.

[0018] Further, the oxidizing air fan comprises a main fan and a standby fan.

[0019] Further, the oxidizing air system further comprises a shut-off valve, and the shut-off valve is arranged between the outlet ends of every two gas conveying pipes of the oxidizing air main pipe.

[0020] Further, the number of the shut-off valves is consistent with the number of the absorption towers.

[0021] The beneficial effects of the utility model are as follows:

[0022] The utility model provides a set of centralized automatic monitoring system, through setting up oxidation reduction potential detection subassembly in the bottom of absorption tower, oxidation reduction potential detection subassembly is connected with oxidizing air control system through cable, and oxidizing air system is connected with oxidizing air control system through cable. After setting up, oxidation reduction potential detection subassembly can transmit the ORP value of real time monitoring to oxidizing air control system, and the oxidizing air control system determines the adjustment information of oxidizing air according to the preset ORP range, and transmits the adjustment information to the regulating valve and adjusts the oxidizing air flow, can ensure that the oxidation reduction potential of slurry in the absorption tower always maintains in the optimum range, and the slurry ORP value in the absorption tower recovers to the normal range after adjustment, thereby improving the desulfurization efficiency, saving the fan energy consumption to the maximum, and each absorption tower automatically adjusts the air volume according to the oxidation degree measurement value and the set value deviation, realizes the air volume of each absorption tower on demand matching.

[0023] Other features and advantages of the present application will be set forth in the descriptions below, and in part will be apparent from the descriptions, or can be learned by practice of the present application. The purposes and other advantages of the present application can be realized and obtained by the structure particularly pointed out in the descriptions, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0025] Figure 1 A schematic diagram of a wet flue gas desulfurization oxidation air sub-tower adjustment control device is shown in the embodiment of the present application.

[0026] 1, absorption tower; 2, liquid delivery pipeline; 3, regulating valve; 4, flowmeter; 5, shut-off valve; 6, oxidizing air main pipe; 7, check valve; 8, oxidizing air blower; 9, inlet branch pipe; 10, gas delivery pipe; 11, detection probe. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely explain the technical scheme in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0028] The air distribution tower adjusting and controlling device provided by the utility model is used for adjusting the distribution tower flow entering each absorption tower 1, the absorption tower 1 is the core equipment of the wet flue gas desulfurization system, and usually comprises a nozzle, a stirrer, a demister and the like inside. The nozzle is used for uniformly spraying the limestone slurry into the absorption tower 1 and fully contacting with the ascending flue gas; the stirrer ensures that the lime slurry is uniformly distributed in the tower; and the demister is used for removing the liquid drops in the flue gas.

[0029] As shown in Figure 1 The wet flue gas desulfurization oxidation air distribution tower adjusting and controlling device comprises an oxidation-reduction potential detection assembly, an oxidation air system, an oxidation air regulating system and an oxidation air main pipe 6, the oxidation-reduction potential detection assembly is installed outside the absorption tower 1, the signal output end of the oxidation-reduction potential detection assembly is connected with the signal input end of the oxidation air regulating system; the signal output end of the oxidation air regulating system is connected with the signal receiving end of the oxidation air system, the oxidation air outlet of the oxidation air system leads to the oxidation air main pipe 6, and the two outlets of the oxidation air main pipe 6 lead to two absorption towers 1 respectively.

[0030] Specifically, the oxidation-reduction potential detection assembly is installed at the bottom of the absorption tower 1 and is used for on-line monitoring of the ORP value (oxidation-reduction potential value) of the slurry in the absorption tower 1. The oxidation-reduction potential detection assembly is connected with the oxidation air regulating system through a cable, and the oxidation air system is connected with the oxidation air regulating system through a cable.

[0031] An interface and an oxidation air inlet (not shown in the figure) are arranged on each absorption tower 1, wherein the interface facilitates uniform distribution of the oxidation air in the absorption tower, the oxidation air inlet is connected with the gas inlet branch pipe 9, the gas inlet end of the gas inlet branch pipe 9 is connected with the outlet end of the oxidation air main pipe 6, and the gas inlet branch pipe 9 is used for leading the oxidation air into the absorption tower 1.

[0032] The oxidation-reduction potential detection assembly is arranged at an easily operated position (generally about 1m away from the ground) at the bottom of the absorption tower 1 and specifically comprises a liquid conveying pipeline 2 and a detection probe 11, the liquid conveying pipeline 2 extends from the interface of the absorption tower 1 to the outside of the absorption tower 1, and the detection probe 11 is arranged at the outside portion of the liquid conveying pipeline 2 of the absorption tower 1. It should be noted that, in actual installation, the installation position of the oxidation-reduction potential detection assembly should avoid the dead water area and the stirrer installation area.

[0033] In an embodiment of the utility model, the oxidation-reduction potential detection component is an ORP on-line detector, the ORP on-line detector is connected with the oxidizing air control system through a cable, and the ORP value monitored in real time is transmitted to the oxidizing air control system, and the oxidizing air control system distributes and adjusts the oxidizing air amount supplied by the oxidizing air system according to the preset ORP range. When the ORP value is too low, it indicates that the slurry in the absorption tower 1 is not completely oxidized, most of the limestone slurry generates calcium sulfite and is discharged, which affects the dehydration effect of gypsum and the quality of gypsum, and when the ORP value is too high, it indicates that the slurry in the absorption tower 1 has been completely oxidized, and the oxidizing air amount is sufficient.

[0034] The oxidizing air control system comprises a flowmeter 4 and an adjusting valve 3, the flowmeter 4 and the adjusting valve 3 are arranged on the oxidizing air main pipe 6, wherein the flowmeter 4 is arranged on the side close to the absorption tower 1, and the adjusting valve 3 is arranged on the side away from the absorption tower 1. The adjusting valve 3 is interlocked with the oxidation-reduction potential detection component and the oxidizing air system, when the oxidizing air system is in low load, the ORP value in the two absorption towers 1 can be adjusted, the adjusting valve 3 on the side with high ORP value can appropriately reduce the opening degree of the adjusting valve through the oxidizing air control system, so as to reduce the supply amount of oxidizing air, and the oxidizing air control system increases the opening degree of the adjusting valve on the side with low ORP value, so as to increase the supply amount of oxidizing air, so as to maintain the ORP value of the slurry in the absorption tower 1 in the preset range. The flowmeter 4 is used for on-line detection of the oxidizing air amount after adjustment, and the detection value can reflect the distribution of the oxidizing air after adjustment.

[0035] The main function of the oxidizing air system is to send fresh air or oxygen from the outside into the absorption tower 1, and the slurry in the absorption tower 1 is oxidized with calcium sulfite to generate calcium sulfate, and then gypsum is formed.

[0036] The oxidizing air system comprises an oxidizing air fan 8, a gas conveying pipe 10, a check valve 7 and a shut-off valve 5. The outlet of the oxidizing air fan 8 is provided with the gas conveying pipe 10, the check valve 7 is arranged on the gas conveying pipe 10, and the outlet end of the gas conveying pipe 10 is connected with the oxidizing air main pipe 6. The oxidizing air fan 8 comprises a main fan and a standby fan, the number of main oxidizing air fans 8 is selected according to the working load of the oxidizing air system by controlling the shut-off valve 5, and the remaining oxidizing air fans 8 are standby fans, and the oxidizing air outlets of the standby fans are connected to the oxidizing air main pipes 6 of the two absorption towers 1, and the shut-off valves 5 are arranged between every two gas conveying pipes 10 (that is, the shut-off valves 5 are arranged on the outlet ends of every two gas conveying pipes 10 on the oxidizing air main pipe 6) to separate the oxidizing air.

[0037] In an embodiment of the utility model, as shown in Figure 1As shown, the oxidation air system is provided with three sets of oxidation air fans (oxidation air fan A, oxidation air fan B and oxidation air fan C), and the control of the oxidation air fans is determined according to the load, one oxidation air fan 8 is started to provide oxidation air for two absorption towers 1 when running at low load (1 standby 2 at this time), and the amount of oxidation air distributed to the two absorption towers 1 is adjusted through the regulating valve 3; two oxidation air fans 8 are started to provide oxidation air for one absorption tower 1 each when running at high load (2 standby 1 at this time), and the oxidation air fan B is the standby fan. When running at high load, two absorption towers 1 need to start one oxidation air fan 8 each, when the oxidation air fan A is in standby state, the valve 5AA101 is closed and the AA102 is opened, the oxidation air fan B provides oxidation air for the left absorption tower 1, and the oxidation air fan C provides oxidation air for the right absorption tower 1; when the oxidation air fan B is in standby state, the valves 5AA101 and AA102 are both closed, the oxidation air fan A provides oxidation air for the left absorption tower 1, and the oxidation air fan C provides oxidation air for the right absorption tower 1; when the oxidation air fan C is in standby state, the valve 5AA101 is closed and the AA102 is opened, the oxidation air fan A provides oxidation air for the left absorption tower 1, and the oxidation air fan B provides oxidation air for the right absorption tower 1. When running at high load, the regulating valve 3 is adjusted to the maximum, and no adjustment is needed. Figure 1 Figure 1 When running at high load, the regulating valve 3 is adjusted to the maximum, and no adjustment is needed.

[0038] The oxidation-reduction potential detection assembly transmits the real-time monitored ORP value to the oxidation air regulation system, the oxidation air regulation system determines the adjustment information of the oxidation air according to the preset ORP range, and transmits the adjustment information to the regulating valve. Through the above adjustment mode, it can be ensured that the oxidation-reduction potential of the slurry in the absorption tower 1 is always maintained in the optimal range, and the ORP value of the slurry in the absorption tower 1 is restored to the normal range after adjustment, thereby improving the desulfurization efficiency.

[0039] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.​

Claims

1. A wet flue gas desulfurization oxidizing air split-tower adjustment control device, characterized by, The application relates to an oxidation-reduction potential detection assembly, an oxidation air system, an oxidation air control system and an oxidation air main pipe (6). The oxidation-reduction potential detection assembly is installed outside the absorption tower (1), and a signal output end of the oxidation-reduction potential detection assembly is connected with a signal input end of the oxidation air control system. A signal output end of the oxidation air control system is connected with a signal receiving end of the oxidation air system, an oxidation air outlet of the oxidation air system is connected with the oxidation air main pipe (6), two outlets of the oxidation air main pipe (6) are connected with two absorption towers (1) respectively, and the oxidation air control system comprises an adjusting valve (3). The oxidation air system comprises oxidation air fans (8), gas conveying pipes (10), check valves (7) and shut-off valves (5); an outlet of each oxidation air fan (8) is provided with a gas conveying pipe (10), the gas conveying pipe (10) is provided with a check valve (7), and an outlet end of the gas conveying pipe (10) is connected with the oxidation air main pipe (6); the oxidation air fan (8) is interlocked with the adjusting valve (3); and the shut-off valve (5) is arranged between the outlet ends of every two gas conveying pipes (10) on the oxidation air main pipe (6). The oxidation-reduction potential detection assembly comprises a liquid conveying pipeline (2) and a detection probe (11); the liquid conveying pipeline (2) is led out from an interface arranged on the absorption tower (1) and extends to the outside of the absorption tower (1), and the detection probe (11) is arranged on the liquid conveying pipeline (2).

2. The wet flue gas desulfurization oxidizing air split-tower adjustment control device according to claim 1, characterized in that, An oxidation air inlet is arranged on the absorption tower (1), the oxidation air inlet is connected with a gas inlet branch pipe (9), and a gas inlet end of the gas inlet branch pipe (9) is connected with an outlet end of the oxidation air main pipe (6).

3. The wet flue gas desulfurization oxidizing air split-tower regulation control device according to claim 1, characterized in that, The installation position of the oxidation-reduction potential detection assembly avoids the dead water area and the agitator installation area of the absorption tower (1).

4. The wet flue gas desulfurization oxidizing air split-tower adjustment control device according to claim 1 or 2, characterized in that, The oxidation air control system further comprises a flow meter (4).

5. The wet flue gas desulfurization oxidizing air split-tower regulation control device according to claim 1, characterized in that, The flow meter (4) and the adjusting valve (3) are arranged on the oxidation air main pipe (6). The adjusting valve (3) is interlocked with the oxidation-reduction potential detection assembly. The flow meter (4) is arranged on one side close to the absorption tower (1), and the adjusting valve (3) is arranged on one side away from the absorption tower (1).

6. The wet flue gas desulfurization oxidizing air split-tower regulation control device according to claim 5, characterized in that, The oxidation air fan (8) comprises a main fan and a standby fan.

7. The wet flue gas desulfurization oxidizing air split-tower regulation control device according to claim 1, characterized in that, The number of the shut-off valves (5) is consistent with the number of the absorption towers (1).

8. The wet flue gas desulfurization oxidizing air split-tower regulation control device according to claim 7, characterized in that, ​

Images