Desulfurizing tower

Abstract

The desulfurization tower comprises a tower body, a smoke inlet and a drain outlet are formed in the side portion of the tower body, a smoke outlet is formed in the top of the tower body, and a liquid storage tank, at least one heat exchange layer and at least one absorption layer are sequentially arranged in the tower body from bottom to top at intervals; the cooling supply unit is arranged outside the tower body, is communicated with the liquid storage tank and is used for controlling the temperature of the desulfurization liquid in the liquid storage tank; the heat exchange layer is positioned above the smoke inlet and is used for absorbing heat in the waste gas and cooling the waste gas; the cooling supply unit is used for cooling the desulfurization liquid and then supplying the desulfurization liquid into the tower body for cooling and reacting the waste gas, so that the cooling effect on the tower body is prevented from being influenced by over-high temperature of the desulfurization liquid; waste gas entering the tower body exchanges heat with the desulfurization liquid through the heat exchange layer and can react with the desulfurization liquid preliminarily, the temperature of the waste gas is controlled so that the waste gas can react with the desulfurization liquid fully again in the absorption layer, the desulfurization efficiency is improved, the temperature of the tower body and the temperature during discharging are reduced, and the phenomenon of white smoke caused by too large temperature difference at the smoke outlet is avoided.

Description

Technical Field

[0001] This application relates to the technical field of desulfurization towers, and specifically relates to a desulfurization tower. Background Art

[0002] A desulfurization tower, also known as a desulfurization dust collector, is a tower-shaped device for desulfurizing industrial waste gas. By converting sulfur dioxide in the waste gas into stable sulfates, the purpose of reducing sulfide emissions is achieved; sulfur dioxide contacts and mixes with the desulfurization liquid (such as limestone slurry) in the desulfurization tower, and the desulfurization liquid absorbs sulfur dioxide, transferring it from the waste gas to the desulfurization liquid. During the desulfurization process, since the temperature of the waste gas is very high, the temperature inside the tower is generally between 100°C and 160°C, while the chemical reaction temperature between the desulfurization liquid and the waste gas is generally optimal between 35°C and 45°C. The existing desulfurization tower sprays the desulfurization liquid to the packing layer or directly sprays it into the tower body through a spraying mechanism to carry out a chemical reaction with the waste gas. Although it has a certain cooling effect on the waste gas, the temperature of the discharged waste gas is still relatively high, and the cooling effect on the waste gas is poor, resulting in an unsatisfactory desulfurization effect. Utility Model Content

[0003] This application provides a desulfurization tower to solve the problem in the above-mentioned prior art that the cooling effect on waste gas is not good, resulting in an unsatisfactory desulfurization effect, and adopts the following technical solutions:

[0004] The desulfurization tower includes a tower body. An inlet for flue gas and a sewage outlet are provided on the side of the tower body, and an exhaust outlet is provided at the top. Inside the tower body, a liquid storage tank, at least one heat exchange layer, and at least one absorption layer are provided in sequence from bottom to top;

[0005] The cooling supply unit is arranged outside the tower body and communicated with the liquid storage tank, and is used to reduce the temperature of the desulfurization liquid in the liquid storage tank;

[0006] The heat exchange layer is located above the inlet for flue gas and includes heat exchange plates and a first spraying mechanism. The heat exchange plates are used to absorb the heat in the waste gas, and the first spraying mechanism sprays the desulfurization liquid on the heat exchange plates to cool the heat exchange plates.

[0007] Its technical effect is that: the heat exchange layer first exchanges heat and cools the waste gas entering the tower body. At the same time, the waste gas and the desulfurization liquid can initially react and absorb, avoiding too high a temperature when reaching the absorption layer, which is not conducive to the chemical reaction between the desulfurization liquid and the waste gas. The cooling supply unit cools the desulfurization liquid deposited in the liquid storage tank after the heat exchange reaction and then supplies it to the desulfurization tower again for cooling and reaction. At the same time, it avoids the tower body being damaged due to too high a temperature, affecting its service life.

[0008] Preferably, the heat exchange plates include a number of ventilation holes for the waste gas to pass through and a number of flow holes for the desulfurization liquid to pass through.

[0009] The technical effect is that it is convenient for the exhaust gas and the desulfurized liquid after heat exchange to pass through the heat exchange plate.

[0010] Further preferably, the heat exchange plate is V-shaped or wavy.

[0011] The technical effect is that the contact area with the exhaust gas can be increased, thereby improving the heat exchange efficiency.

[0012] Further preferably, the vent holes are arranged at the top of the heat exchange plate, and the flow holes are arranged at the bottom of the heat exchange plate.

[0013] The technical effect is that the waste gas and the separated liquid do not interfere with each other during the circulation and heat exchange process.

[0014] Preferably, when there are at least two heat exchange layers, the heat exchange layers are arranged alternately with each other.

[0015] The technical effect is that the staggered arrangement can increase the residence time of the exhaust gas between the heat exchange layers, prevent the exhaust gas from passing through each heat exchange layer quickly, and further improve the heat exchange and cooling effect.

[0016] Preferably, the cooling supply unit includes a cooling box and a power device, as well as a refrigeration component for cooling the desulfurization liquid in the cooling box. The power device is used to transport the desulfurization liquid in the liquid storage tank to the cooling box for cooling and then supply it to the first spray mechanism and the absorption layer.

[0017] The technical effect is that the desulfurized liquid after cooling in the tower can be cooled, and the cooled desulfurized liquid is supplied to the tower body for cooling and reaction again.

[0018] Preferably, the first spray mechanism includes at least one supporting tube and a plurality of nozzles, and at least one annular tube arranged on the supporting tube, the annular tube is provided with a plurality of nozzles, the supporting tube and the annular tube are internally interconnected, and the nozzles are correspondingly connected to the nozzles.

[0019] The technical effect is that the separation liquid can be evenly sprayed into the tower body to improve the cooling and reaction of the exhaust gas from the tower body, thereby avoiding overheating of the tower body that affects the service life and improving the desulfurization effect of the exhaust gas.

[0020] Further preferably, it further comprises a flow guide component, wherein the flow guide component is arranged above the first spray mechanism, and a plurality of flow guide grooves are evenly distributed circumferentially on the flow guide component.

[0021] The technical effect is that the exhaust gas passing through the heat exchange layer can be mixed when passing through the guide component, thereby avoiding excessive temperature difference of the exhaust gas passing through various parts of the heat exchange layer.

[0022] Further preferably, it further includes a detection component, which includes a first detection component and a second detection component. The first detection component is arranged in the cooling tank, and the second detection component is arranged in the tower body; the detection component can monitor the temperature of the desulfurization liquid in each layer of the tower body and in the cooling tank in real time.

[0023] Preferably, it further includes a control device, which is electrically connected to the detection component, the heat exchange layer and the cooling supply unit; and controls the operation of each component according to the signal feedback by the detection component.

[0024] In summary, the beneficial effects of the present application compared with the prior art are as follows:

[0025] After the cooling supply unit cools down the desulfurization liquid, it is then supplied into the tower body to provide heat exchange cooling and reaction for the waste gas, avoiding the influence of too high temperature of the desulfurization liquid on the cooling effect of the tower body; the waste gas entering the tower body will exchange heat with the desulfurization liquid through the heat exchange layer, and the waste gas can also react preliminarily with the desulfurization liquid to control the temperature of the waste gas so as to fully react with the desulfurization liquid again in the absorption layer, thereby improving the desulfurization efficiency, reducing the temperature of the tower body and the temperature when discharging from the tower body, and avoiding the "white smoke" phenomenon caused by too large temperature difference at the smoke outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the structural schematic diagram of the present application;

[0027] Figure 2 is the structural schematic diagram of the heat dissipation plate of the present application;

[0028] Figure 3 is the structural schematic diagram of the flow guiding component of the present application;

[0029] Figure 4 is the structural schematic diagram of the spraying mechanism of the present application.

[0030] In the figure:

[0031] 1. Tower body, 10. Liquid storage tank, 11. Smoke inlet, 12. Smoke outlet, 13. Drainage port;

[0032] 2. Heat exchange layer, 21. Heat exchange plate, 211. Vent hole, 212. Flow through hole, 22. First spraying mechanism, 221. Support pipe, 222. Annular pipe, 223. Nozzle;

[0033] 3. Flow guiding component, 31. Flow guiding groove;

[0034] 4. Absorption layer, 41. Packing layer, 42. Second spraying mechanism;

[0035] 5. Demister;

[0036] 6. Cooling supply unit, 61. Cooling box, 62. Refrigeration component, 63. First power device, 64. Second power device. Detailed implementation manners

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the present application. Obviously, the described embodiments of the present application are only some embodiments of the present application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0038] Combined with Figures 1 to 4 , the present application is further described.

[0039] The desulfurization tower includes a tower body 1. An inlet flue gas port 11 and a sewage discharge port 13 are provided on the side of the tower body 1, and an exhaust flue gas port 12 is provided at the top. A liquid storage tank 10, at least one heat exchange layer 2, and at least one absorption layer 4 are sequentially arranged in the tower body 1 from bottom to top. The inlet flue gas port 11 is located below the heat exchange layer 2. In this embodiment, there are two heat exchange layers 2 and one absorption layer 4. Of course, the number of layers of the heat exchange layer 2 and the absorption layer 4 can be adjusted according to actual use. A demister 5 is further provided above the absorption layer 4.

[0040] Combined with Figure 1 , the cooling supply unit 6 is arranged outside the tower body 1 and communicated with the liquid storage tank 10 for controlling the temperature of the desulfurization liquid in the liquid storage tank. The heat exchange layer 2 is located above the inlet flue gas port 11 and includes heat exchange plates 21 and a first spraying mechanism 22. The heat exchange plates 21 are used to absorb the heat in the waste gas, and the first spraying mechanism 22 sprays desulfurization liquid on the heat exchange plates 21 to cool the heat exchange plates 21. It can be understood that the heat exchange plates 21 are made of heat-conductive materials, such as aluminum, copper, or iron, etc.

[0041] In an embodiment not shown, the inlet flue gas port can be divided into multiple inlet flue gas pipes extending into the desulfurization liquid in the liquid storage tank 10. When the waste gas enters the tower body, it will first pass through the desulfurization liquid in the liquid storage tank 10, and the waste gas can be preliminarily cooled.

[0042] Combined with Figure 1 , the absorption layer 4 includes a packing layer 41 and a second spraying mechanism 42. The second spraying mechanism 42 is arranged above the packing layer 41. The second spraying mechanism 42 can evenly spray the desulfurization liquid onto the packing layer 41, which can greatly increase the contact area between the desulfurization liquid and the waste gas and improve the desulfurization effect.

[0043] The cooling supply unit 6 includes a cooling tank 61 and a power device, as well as a refrigeration component 62 for cooling the desulfurization liquid in the cooling tank 61. The power device is used to transport the desulfurization liquid in the liquid storage tank 10 to the cooling tank 61 for cooling and then supply it to the spraying mechanism and the absorption layer 4. The refrigeration component 62 can be a refrigerator or a heat pump device, etc., as long as it can cool the desulfurization liquid in the cooling tank 61. Among them, the power device includes a first power device 63 and a second power device 64, both of which are pumps. The first power device 63 is used to pump the desulfurization liquid in the liquid storage tank 10 into the cooling tank 61, and the second power device 64 is used to transport the separated liquid in the cooling tank 61 to the second spraying mechanism 42, so as to be able to cool the desulfurization liquid cooled in the tower, and supply the cooled and cooled desulfurization liquid to the tower body 1 again to cool down and react with the waste gas.

[0044] First, the waste gas entering the tower body 1 first passes through the heat exchange layer 2 for heat exchange. During this process, the temperature of the waste gas can be reduced, and at the same time, the waste gas can be prevented from increasing the temperature of the tower body 1 itself, avoiding too high a temperature when reaching the absorption layer 4, which is not conducive to the chemical reaction between the desulfurization liquid and the waste gas. At the same time, during the heat exchange process, the waste gas and the desulfurization liquid can be preliminarily reacted and absorbed (i.e., desulfurized). After using the cooling supply unit 6 to cool the desulfurization liquid deposited in the liquid storage tank 10 by heat exchange, it is supplied to the desulfurization tower again for cooling and reaction to improve the cooling effect, and at the same time, it is avoided that the tower body 1 is damaged due to too high a temperature, affecting its service life.

[0045] Combined Figure 1 , the heat exchange plate 21 includes a number of ventilation holes 211 for the waste gas to pass through, and a number of flow holes 212 for the desulfurization liquid to pass through. The waste gas flows upward in the tower body through the ventilation holes 211, and the desulfurization liquid flows downward in the tower body through the flow holes 212 and converges in the liquid storage tank. It is convenient for the waste gas and the desulfurization liquid to flow, and they do not interfere with each other.

[0046] Combined Figure 1 and Figure 2 , the heat exchange plate 21 is in a V shape or a wavy shape. The ventilation holes 211 are provided at the top of the heat exchange plate 21, and the flow holes 212 are provided at the bottom of the heat exchange plate 21. This can increase the contact surface between the waste gas and the heat exchange plate 21, increase the residence time of the waste gas in the heat exchange layer 2 to improve the heat exchange efficiency, and ensure that the waste gas and the separated liquid do not interfere with each other during the flow and heat exchange process. In some embodiments, the ventilation holes 211 and the flow holes 212 can also be correspondingly provided on the top and bottom side surfaces of both sides of the heat exchange plate 21.

[0047] Combined Figure 1, when at least two of the heat exchange layers 2 are provided, the heat exchange layers 2 can be arranged in a staggered manner. The staggered arrangement can increase the retention time of the exhaust gas between the heat exchange layers 2, prevent the exhaust gas from passing through each heat exchange layer 2 quickly, and further improve the heat exchange and cooling effect; combined with Figure 1 and Figure 3 , a guide component 3 is also provided on it, and the guide component 3 helps to mix the exhaust gas passing through the air holes 211, so as to avoid different temperatures of the exhaust gas passing through each of the air holes 211, resulting in insufficient desulfurization in the subsequent absorption layer 4; wherein, a plurality of guide grooves 31 are distributed circumferentially on the guide component 3, and the guide grooves 31 can be sloped or arc-shaped, etc.; when the exhaust gas passing through the heat exchange layer 2 passes through the guide component 3, the exhaust gas can be mixed through the guide grooves 31, so as to avoid excessive temperature difference of the exhaust gas passing through various parts of the heat exchange layer 2, so as to facilitate subsequent reaction in the absorption layer 4.

[0048] Combination Figure 1 and Figure 4 The first spray mechanism 22 includes at least one support pipe 221 and a plurality of nozzles 223, and at least one annular pipe 222 arranged on the support pipe 221, the annular pipe 222 is provided with a plurality of nozzles, the support pipe 221 and the annular pipe 222 are internally connected to each other, and the nozzles 223 are correspondingly connected to the nozzles; the second spray mechanism 42 has the same structure as the first spray mechanism 22. In this way, the spray mechanism can evenly spray the separation liquid into the tower body 1 to fully react with the exhaust gas to absorb sulfur, and evenly spray it on the heat exchange plate 21 to improve the cooling and reaction of the exhaust gas of the tower body 1, thereby avoiding the overheating of the tower body 1 affecting the service life and improving the desulfurization effect of the exhaust gas.

[0049] In an embodiment not shown, a detection component is also included, which includes a first detection component and a second detection component. The first detection component is arranged in the cooling box 61 to detect the temperature and liquid level of the desulfurization liquid in the cooling box 61, and the second detection component is arranged in the tower body 1. The second detection component can be multiple and distributed in each layer to detect the temperature of each layer.

[0050] In an embodiment not shown, a control device is also included, which is electrically connected to the detection component, the heat exchange layer 2 and the cooling supply unit 6; the operation of each component is controlled according to the signal fed back by the detection component to ensure the reaction temperature of the exhaust gas in the tower body 1, thereby reducing the temperature of the tower body 1.

Claims

1. Desulfurization tower, including a tower body, wherein a flue gas inlet and a sewage outlet are provided on the side of the tower body, and a smoke exhaust outlet is provided on the top, and it is characterized in that: A liquid storage tank, at least one heat exchange layer, and at least one absorption layer are successively arranged in the tower body from bottom to top. The cooling supply unit is arranged outside the tower body and communicated with the liquid storage tank, and is used to reduce the temperature of the desulfurization liquid in the liquid storage tank. The heat exchange layer is located above the flue gas inlet, and includes a heat exchange plate and a first spraying mechanism. The heat exchange plate is used to absorb the heat in the waste gas, and the first spraying mechanism sprays the desulfurization liquid on the heat exchange plate to cool the heat exchange plate.

2. The desulfurization tower according to claim 1, characterized in that: The heat exchange plate includes a plurality of ventilation holes for the waste gas to pass through and a plurality of flow holes for the desulfurization liquid to pass through.

3. The desulfurization tower according to claim 2, wherein: The heat exchange plate is in a V shape or a wavy shape.

4. The desulfurization tower according to claim 3, characterized in that: The ventilation holes are arranged at the top of the heat exchange plate, and the flow holes are arranged at the bottom of the heat exchange plate.

5. The desulfurization tower according to claim 1, characterized in that: When there are at least two heat exchange layers, each heat exchange layer is arranged in a staggered manner with each other.

6. The desulfurization tower according to claim 1, wherein: The cooling supply unit includes a cooling tank, a power device, and a refrigeration component for cooling the desulfurization liquid in the cooling tank. The power device is used to transport the desulfurization liquid in the liquid storage tank to the cooling tank for cooling and then supply it to the first spraying mechanism and the absorption layer.

7. The desulfurization tower according to claim 1, characterized in that: The first spraying mechanism includes at least one support pipe, a plurality of nozzles, and at least one annular pipe arranged on the support pipe. A plurality of spray ports are distributed on the annular pipe. The interior of the support pipe and the annular pipe is interconnected, and the nozzles are correspondingly connected to the spray ports.

8. The desulfurization tower according to claim 6, characterized in that: It further includes a diversion component, which is arranged above the first spraying mechanism, and a plurality of diversion grooves are circumferentially and evenly distributed on the diversion component.

9. The desulfurization tower according to claim 8, wherein: It further includes a detection component, which includes a first detection component and a second detection component. The first detection component is arranged in the cooling tank, and the second detection component is arranged in the tower body.

10. The desulfurization tower according to claim 9, characterized in that: It further includes a control device, which is electrically connected to the detection component, the heat exchange layer, and the cooling supply unit.

Images