Flue gas desulfurization and seawater desalination coupled waste heat utilization system

Abstract

The waste heat utilization system of flue gas desulfurization and seawater desalination coupling of the present invention includes: a seawater distillation generator having a distillation chamber and a condensation chamber; a first heating section having a heat source inlet, a heat source chamber, a heat source outlet, a heated medium inlet, a heated medium chamber, and a heated medium outlet; a cylinder having a first exhaust outlet and a second exhaust outlet for discharging steam, wherein the steam temperature discharged from the first exhaust outlet is higher than the steam temperature discharged from the second exhaust outlet, and the second exhaust outlet is connected to the heated medium inlet; and a flue gas desulfurization device having a desulfurization heat source outlet for discharging heat source medium, wherein at least one of the desulfurization heat source outlet and the first exhaust outlet is connected to the heat source inlet. Therefore, the waste heat utilization system of flue gas desulfurization and seawater desalination coupling according to the present invention has the advantage of energy saving.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology, specifically to a waste heat utilization system that couples flue gas desulfurization and seawater desalination. Background Technology

[0002] Most coal-fired power plants use limestone-gypsum wet desulfurization technology to treat flue gas, which has the advantages of high desulfurization efficiency and stable operation. The wet desulfurization process uses limestone slurry to wash the flue gas in the desulfurization tower, absorbing sulfur dioxide. During this process, the flue gas, at 90℃ to 120℃, heats the desulfurization slurry and absorbs evaporated water vapor, reaching a saturated state of approximately 50℃ at the outlet of the desulfurization tower. The vast majority of water consumption in the wet desulfurization system is transferred to the flue gas side. Taking a 100MW unit as an example, the flue gas after wet desulfurization carries more than 33t / h of moisture, with a latent heat of vaporization equivalent to a coal consumption of 1.3t / h. Most of the moisture in the flue gas exists in the form of water vapor, which originates from the evaporation of the desulfurization slurry and coal combustion. A small portion of the moisture exists in the form of droplets, which are droplets carried during the flue gas desulfurization process and droplets formed by the condensation of water vapor in the flue gas later. After wet desulfurization, latent heat becomes the main form of heat in the flue gas, increasing its proportion from 37% before desulfurization to 75%. In related technologies, most coal-fired power plants adopt direct wet flue gas emission processes. Although some power plants add wet electrostatic precipitators after the wet desulfurization system to remove residual droplets and acid mist in the flue gas, thereby further reducing the emission concentration of pollutants, this still fails to change the saturated state of the flue gas. The high water vapor content in the flue gas, coupled with the high latent heat of water vapor condensation, results in significant waste heat loss during flue gas emission, leading to a waste of energy and water resources. Furthermore, the direct emission of saturated flue gas not only causes low-temperature corrosion inside the chimney but also creates environmental problems such as white plumes and gypsum rain. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a waste heat utilization system that couples flue gas desulfurization with seawater desalination.

[0004] The waste heat utilization system for coupled flue gas desulfurization and seawater desalination according to an embodiment of the present invention includes:

[0005] A seawater distillation generator has a distillation chamber and a condensation chamber. The medium in the condensation chamber is used to heat the medium in the distillation chamber. The distillation chamber is used to evaporate the seawater introduced therein. The distillation chamber has a desalination steam outlet and a concentrated brine outlet. The desalination steam outlet is used to discharge desalination steam, and the concentrated brine outlet is used to discharge concentrated brine.

[0006] A first heating section has a heat source inlet, a heat source cavity, a heat source outlet, a heated medium inlet, a heated medium cavity, and a heated medium outlet. The heat source cavity is connected to the heat source inlet and the heat source outlet. The heated medium cavity is connected to the heated medium inlet and the heated medium outlet. The heat source cavity and the heated medium cavity are spaced apart. The heat source in the heat source cavity can heat the heated medium in the heated medium cavity. The heated medium outlet is connected to the inlet of the condensation cavity.

[0007] The cylinder has a first exhaust outlet and a second exhaust outlet for discharging steam, the steam temperature discharged from the first exhaust outlet is greater than the steam temperature discharged from the second exhaust outlet, and the second exhaust outlet is connected to the inlet of the heated medium.

[0008] A flue gas desulfurization device, wherein the flue gas desulfurization device has a desulfurization heat source outlet, the desulfurization heat source outlet can discharge a heat source medium, and at least one of the desulfurization heat source outlet and the first exhaust steam outlet is connected to the heat source inlet.

[0009] Therefore, the waste heat utilization system that couples flue gas desulfurization and seawater desalination according to embodiments of the present invention has the advantage of saving energy.

[0010] In some embodiments, the heat source inlet includes a first heat source inlet and a second heat source inlet;

[0011] The heat source outlet includes a first heat source outlet and a second heat source outlet;

[0012] The heat source cavity includes a first heat source cavity and a second heat source cavity, the first heat source cavity and the second heat source cavity are spaced apart, the first heat source cavity is connected to the first heat source inlet and the first heat source outlet, and the second heat source cavity is connected to the second heat source inlet and the second heat source outlet.

[0013] The first exhaust steam outlet is connected to the first heat source inlet, and the desulfurization heat source outlet is connected to the second heat source inlet.

[0014] In some embodiments, the cylinder includes an intermediate-pressure cylinder and a low-pressure cylinder, the intermediate-pressure cylinder having a first exhaust outlet, and the low-pressure cylinder having a second steam inlet and a second exhaust outlet;

[0015] The first exhaust steam outlet is connected to the second steam inlet via a first pipeline;

[0016] The first exhaust steam outlet is connected to the first heat source inlet via a second pipeline;

[0017] The second exhaust outlet is connected to the inlet of the heated medium via a third pipeline.

[0018] In some embodiments, a regulating valve is provided on the second pipeline, the regulating valve being used to regulate the flow rate of the fluid in the second pipeline;

[0019] The third pipeline is equipped with a first gate valve;

[0020] The second exhaust steam outlet is connected to the inlet of the condenser via a fourth pipeline, and the outlet of the condensing chamber is connected to the inlet of the condenser.

[0021] In some embodiments, the flue gas desulfurization device includes a flue gas conveying pipeline and a desulfurization tower. The flue gas conveying pipeline is used to convey the flue gas to be desulfurized. The outlet of the flue gas conveying pipeline is connected to the inlet of the second heat source, and the outlet of the second heat source is connected to the flue gas inlet of the desulfurization tower.

[0022] In some embodiments, the flue gas desulfurization device includes

[0023] A flash tank, wherein the flash tank has a desulfurization slurry inlet, a cold slurry outlet and a flash steam outlet, and the flash steam outlet is connected to the second heat source inlet;

[0024] A desulfurization tower is used to remove sulfur oxides from flue gas. The bottom of the desulfurization tower is provided with a desulfurization slurry outlet, which is connected to the desulfurization slurry inlet through a desulfurization slurry pipeline. A slurry pump is provided on the desulfurization slurry pipeline. The upper part of the desulfurization tower is provided with a cold slurry inlet, which is connected to the cold slurry outlet.

[0025] In some embodiments, the first heating element is a heat pump.

[0026] The waste heat utilization system of flue gas desulfurization and seawater desalination coupling in this embodiment of the invention includes a seawater delivery pipe. The outlet of the seawater delivery pipe is connected to the inlet of the distillation chamber. The seawater delivery pipe is equipped with a seawater filter and a seawater booster pump. The seawater filter can filter the seawater entering the distillation chamber.

[0027] The waste heat utilization system for coupled flue gas desulfurization and seawater desalination in this embodiment of the invention includes:

[0028] A demineralized water tank, the inlet of which is connected to the demineralized steam outlet via a fifth pipeline, and a demineralized water pump is installed on the fifth pipeline;

[0029] A concentrated brine tank, the inlet of which is connected to the concentrated brine outlet via a sixth pipeline, and a concentrated brine pump is installed on the sixth pipeline.

[0030] In some embodiments, the fifth pipeline exchanges heat with the seawater delivery pipeline through a seawater preheater. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a waste heat utilization system that couples flue gas desulfurization and seawater desalination according to an embodiment of the present invention.

[0032] Figure label:

[0033] 1. Seawater distillation generator; 11. Distillation chamber; 111. Desalination steam outlet; 112. Concentrated brine outlet; 12. Condensation chamber; 13. Seawater delivery pipe; 14. Seawater filter; 15. Seawater booster pump; 16. Desalinated water tank; 161. Desalinated water pump; 17. Concentrated brine tank; 171. Concentrated brine pump; 18. Seawater preheater.

[0034] 2. First heating section; 21. First heat source inlet; 22. First heat source outlet; 23. Second heat source inlet; 24. Second heat source outlet; 25. Heated medium inlet; 26. Heated medium outlet.

[0035] 3. Intermediate pressure cylinder; 31. First exhaust outlet; 32. Regulating valve;

[0036] 4. Low-pressure cylinder; 41. Second steam inlet; 42. Second exhaust outlet; 43. First gate valve; 44. Condenser.

[0037] 5. Flash tank; 51. Desulfurization slurry inlet; 52. Cold slurry outlet; 53. Flash steam outlet;

[0038] 6. Desulfurization tower; 61. Desulfurization slurry outlet; 62. Cold slurry inlet; 63. Slurry pump;

[0039] 71. First pipeline, 72. Second pipeline, 73. Third pipeline, 74. Fourth pipeline, 75. Fifth pipeline, 76. Sixth pipeline. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] The following description, with reference to the accompanying drawings, illustrates a waste heat utilization system for the coupling of flue gas desulfurization and seawater desalination according to an embodiment of the present invention. Figure 1 As shown, the waste heat utilization system for coupled flue gas desulfurization and seawater desalination according to an embodiment of the present invention includes a seawater distillation generator 1, a first heating unit 2, a cylinder, and a flue gas desulfurization device.

[0042] The seawater distillation generator 1 has a distillation chamber 11 and a condensation chamber 12. The medium in the condensation chamber 12 is used to heat the medium (seawater) in the distillation chamber 11. The distillation chamber 11 is used to evaporate the seawater introduced therein. The distillation chamber 11 has a desalination steam outlet 111 and a concentrated brine outlet 112. The desalination steam outlet 111 is used to discharge desalination steam, and the concentrated brine outlet 112 is used to discharge concentrated brine. Specifically, the medium in the condensation chamber 12 is a heat source to heat the seawater in the distillation chamber 11. The distillation chamber 11 removes salt and other dissolved minerals through a distillation process. The desalination steam generated during distillation can be discharged from the desalination steam outlet 111 and can be used to preheat the seawater.

[0043] The first heating section 2 has a heat source inlet, a heat source cavity, a heat source outlet, a heated medium inlet 25, a heated medium cavity, and a heated medium outlet 26. The heat source cavity is connected to the heat source inlet and the heat source outlet, and the heated medium cavity is connected to the heated medium inlet 25 and the heated medium outlet 26. The heat source cavity and the heated medium cavity are spaced apart. The heat source in the heat source cavity can heat the heated medium in the heated medium cavity. The heated medium outlet 26 is connected to the inlet of the condensation cavity 12.

[0044] The cylinder has a first exhaust outlet 31 and a second exhaust outlet 42 for discharging steam. The steam temperature discharged from the first exhaust outlet 31 is higher than that discharged from the second exhaust outlet 42. The second exhaust outlet 42 is connected to the inlet 25 of the heated medium. The flue gas desulfurization device has a desulfurization heat source outlet, which can discharge a heat source medium (the heat source medium can be at least one of flue gas and steam). At least one of the desulfurization heat source outlet and the first exhaust outlet 31 is connected to the heat source inlet.

[0045] The waste heat recovery system for coupled flue gas desulfurization and seawater desalination according to an embodiment of the present invention utilizes the steam discharged from the second exhaust outlet 42 of the cylinder as the heating medium. After being heated by the first heating unit 2, the steam discharged from the second exhaust outlet 42 is introduced into the condensing chamber 12 through the heated medium outlet 26, so that the steam entering the condensing chamber 12 can heat the seawater in the distillation chamber 11. Using the steam discharged from the second exhaust outlet 42 as the heating medium can save water resources and reduce energy consumption.

[0046] Furthermore, at least one of the desulfurization heat source outlet and the first exhaust steam outlet 31 is connected to the heat source inlet. Specifically, the flue gas desulfurization device includes a flue gas pipeline for conveying (undesulfurized) raw flue gas. The outlet of the flue gas pipeline can be connected to the heat source inlet so as to use the heat of the flue gas to heat the heated medium (steam discharged from the second exhaust steam outlet 42) in the first heating section 2. Alternatively, a heat exchanger can be used to exchange heat with the flue gas to generate steam, and the steam discharged from the desulfurization heat source outlet can be connected to the heat source inlet so as to use the heat of the steam to heat the heated medium (steam discharged from the second exhaust steam outlet 42) in the first heating section 2.

[0047] The steam discharged from the first exhaust outlet 31 has a higher temperature and can be used to heat the heated medium (the steam discharged from the second exhaust outlet 42) in the first heating section 2. At least one of the desulfurization heat source outlet and the first exhaust outlet 31 is connected to the heat source inlet, allowing the waste heat utilization system of flue gas desulfurization and seawater desalination coupled according to the embodiment of the present invention to utilize the waste heat of at least one of the cylinder and the desulfurization device to heat the heated medium, and to use the heated medium as the heat source for the seawater distillation generator 1. This enables the use of the waste heat of at least one of the cylinder and the desulfurization device for seawater desalination, thereby saving energy.

[0048] Therefore, the waste heat utilization system that couples flue gas desulfurization and seawater desalination according to embodiments of the present invention has the advantage of saving energy.

[0049] like Figure 1 As shown, in some embodiments, the heat source inlet includes a first heat source inlet 21 and a second heat source inlet 23. The heat source outlet includes a first heat source outlet 22 and a second heat source outlet 24. The heat source cavity includes a first heat source cavity and a second heat source cavity, which are spaced apart. The first heat source cavity is connected to the first heat source inlet 21 and the first heat source outlet 22, and the second heat source cavity is connected to the second heat source inlet 23 and the second heat source outlet 24.

[0050] The first exhaust steam outlet 31 is connected to the first heat source inlet 21, and the desulfurization heat source outlet is connected to the second heat source inlet 23. That is to say, both the desulfurization heat source outlet and the first exhaust steam outlet 31 are connected to the heat source inlet, so that the waste heat from the cylinder and the desulfurization device can be used to heat the heated medium.

[0051] like Figure 1 As shown, in some embodiments, the cylinder includes an intermediate-pressure cylinder 3 and a low-pressure cylinder 4. The intermediate-pressure cylinder 3 has a first exhaust outlet 31, and the low-pressure cylinder 4 has a second steam inlet 41 and a second exhaust outlet 42. Both the intermediate-pressure cylinder 3 and the low-pressure cylinder 4 are power components of the steam turbine, and the steam temperature and pressure discharged from the intermediate-pressure cylinder 3 are greater than those discharged from the low-pressure cylinder 4.

[0052] The first steam outlet 31 is connected to the second steam inlet 41 through the first pipeline 71, meaning that the steam discharged from the intermediate pressure cylinder 3 can enter the low pressure cylinder 4 through the first pipeline 71 to do work.

[0053] The first exhaust steam outlet 31 is connected to the first heat source inlet 21 via a second pipeline 72. A regulating valve 32 is installed on the second pipeline 72 to regulate the flow rate of the fluid within it. Therefore, when the desulfurization unit provides heat to the first heating section 2, the steam flow rate within the second pipeline 72 can be controlled by controlling the regulating valve 32, thereby controlling the amount of steam entering the heat source chamber of the first heating section 2. This reduces energy waste and facilitates timely replenishment when the heat source is insufficient.

[0054] The second steam outlet 42 is connected to the heating medium inlet 25 via a third pipe 73, and a first gate valve 43 is provided on the third pipe 73. After the first gate valve 43 is opened, the steam in the third pipe 73 can enter the heating medium inlet 25, and thus enter the first heating section 2.

[0055] The second exhaust steam outlet 42 is connected to the inlet of the condenser 44 via the fourth pipe 74, and the outlet of the condensing chamber 12 is connected to the inlet of the condenser 44. This allows the low-heat steam and condensate discharged from the second exhaust steam outlet 42 and the outlet of the condensing chamber 12 to enter the condenser and condense.

[0056] In some embodiments, the flue gas desulfurization device includes a flue gas conveying pipeline (not shown in the figure) and a desulfurization tower 6. The flue gas conveying pipeline is used to convey the flue gas to be desulfurized. The outlet of the flue gas conveying pipeline is connected to the inlet 23 of the second heat source, and the outlet 24 of the second heat source is connected to the flue gas inlet of the desulfurization tower 6. Specifically, the flue gas conveying pipeline is connected to the exhaust port of the boiler. After the original flue gas enters the flue gas conveying pipeline, it enters the inlet 23 of the second heat source. After the original flue gas completes heat exchange, it is then introduced into the desulfurization tower 6 for desulfurization, so as to utilize the heat of the original flue gas.

[0057] like Figure 1 As shown, in some embodiments, the flue gas desulfurization device includes a flash tank 5 and a desulfurization tower 6.

[0058] The flash tank 5 has a desulfurization slurry inlet 51, a cold slurry outlet 52, and a flash steam outlet 53, which is connected to the second heat source inlet 23. That is, the steam flashed out of the flash tank 5 is used as a heat source for the second heat source inlet 23.

[0059] The desulfurization tower 6 is used to remove sulfur oxides from the flue gas. The bottom of the desulfurization tower 6 has a desulfurization slurry outlet 61, which is connected to the desulfurization slurry inlet 51 via a desulfurization slurry pipeline. A slurry pump 63 is installed on the desulfurization slurry pipeline. The upper part of the desulfurization tower 6 has a cold slurry inlet 62, which is connected to the cold slurry outlet 52. That is, the desulfurization slurry discharged from the desulfurization slurry outlet 61 of the desulfurization tower 6 can be fed into the flash tank 5 through the slurry pump 63 and the desulfurization slurry inlet 51. Inside the flash tank 5, the desulfurization slurry undergoes an evaporation and cooling process. The flashed steam is discharged from the flash steam outlet 53, and the cold slurry after the evaporation and cooling process is sent back into the desulfurization tower 6 from the cold slurry outlet 52 and the cold slurry inlet 62, spraying it into the tower from the top. Heat is extracted from the desulfurization slurry through flash evaporation in the flash tank 5, improving the utilization of waste heat in the unit.

[0060] In some embodiments, the first heat source chamber is located downstream of the second heat source chamber in the flow path of the medium (steam) within the heated medium chamber. Specifically, the steam discharged from the flash tank 5 is a low-temperature heat source, and the second heat source chamber is a low-temperature heat source chamber. The steam discharged from the first exhaust outlet 31 is a high-temperature heat source, and the first heat source chamber is a high-temperature heat source chamber. The steam entering the heated medium chamber of the first heating section 2 can first exchange heat with the steam in the second heat source chamber, and then exchange heat with the steam in the first heat source chamber, in order to reduce heat loss.

[0061] In some embodiments, the first heating section 2 is a heat pump. The heat pump can utilize various heating media as a heat source. The heat pump can absorb the heat from the high-temperature flue gas of the original flue gas and the heat from the steam (discharged from the flash tank 5 and the first exhaust steam outlet 31). The heated medium (steam) in the first heating section 2 is heated by the combined action of the steam discharged from the first exhaust steam outlet 31 and the flash steam.

[0062] like Figure 1 As shown, in some embodiments, the waste heat utilization system coupled with flue gas desulfurization and seawater desalination includes a seawater delivery pipe 13, a demineralized water tank 16, and a concentrated brine tank 17.

[0063] The outlet of the seawater delivery pipe 13 is connected to the inlet of the distillation chamber 11. The seawater delivery pipe 13 is equipped with a seawater filter 14 and a seawater booster pump 15. The seawater filter 14 can filter the seawater entering the distillation chamber 11. Thus, the filtered seawater can be distilled in the distillation chamber 11 to produce fresh water.

[0064] The inlet of the demineralized water tank 16 is connected to the demineralized steam outlet 111 via a fifth pipe 75, on which a demineralized water pump 161 is installed. The fifth pipe 75 and the seawater delivery pipe 13 exchange heat via a seawater preheater 18. Thus, the heat from the demineralized steam in the fifth pipe 75 can be used to heat the seawater in the seawater delivery pipe 13, facilitating the condensation of the steam in the fifth pipe 75 before it enters the demineralized water tank 16, and reducing the heat required for distillation in the distillation chamber 11.

[0065] The inlet of the concentrated brine tank 17 is connected to the concentrated brine outlet 112 through the sixth pipeline 76. The sixth pipeline 76 is equipped with a concentrated brine pump 171, which can collect concentrated brine.

[0066] The waste heat utilization system of flue gas desulfurization and seawater desalination coupled according to embodiments of the present invention not only reduces water and coal consumption in coal-fired power plants, achieving energy conservation and consumption reduction, but also utilizes the waste heat of flue gas and the internal energy of cylinder exhaust steam to distill seawater, reducing exhaust gas losses and cold source losses, producing a considerable amount of demineralized water and concentrated brine. The desalinated seawater steam is then used to preheat the raw seawater, achieving multi-stage recovery of waste heat resources and improving the overall plant thermal efficiency and economic benefits. By extracting heat and moisture from the desulfurization slurry through flash evaporation, the utilization rate of the unit's waste heat is improved, indirectly reducing flue gas temperature and water content, thus solving the water balance problem within the desulfurization tower and avoiding equipment failures caused by pooling in the desulfurization tower. Extracting heat and moisture from the desulfurization slurry through flash evaporation changes the saturation state of the flue gas, thereby improving environmental problems such as low-temperature corrosion, white plumes, and gypsum rain.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A waste heat utilization system coupling flue gas desulfurization and seawater desalination, characterized in that, include: A seawater distillation generator has a distillation chamber and a condensation chamber. The medium in the condensation chamber is used to heat the medium in the distillation chamber. The distillation chamber is used to evaporate the seawater introduced therein. The distillation chamber has a desalination steam outlet and a concentrated brine outlet. The desalination steam outlet is used to discharge desalination steam, and the concentrated brine outlet is used to discharge concentrated brine. A first heating section has a heat source inlet, a heat source cavity, a heat source outlet, a heated medium inlet, a heated medium cavity, and a heated medium outlet. The heat source cavity is connected to the heat source inlet and the heat source outlet. The heated medium cavity is connected to the heated medium inlet and the heated medium outlet. The heat source cavity and the heated medium cavity are spaced apart. The heat source in the heat source cavity heats the heated medium in the heated medium cavity. The heated medium outlet is connected to the inlet of the condensation cavity. The cylinder has a first exhaust outlet and a second exhaust outlet for discharging steam, the steam temperature discharged from the first exhaust outlet is greater than the steam temperature discharged from the second exhaust outlet, and the second exhaust outlet is connected to the inlet of the heated medium. A flue gas desulfurization device, wherein the flue gas desulfurization device has a desulfurization heat source outlet, the desulfurization heat source outlet can discharge heat source medium, and both the desulfurization heat source outlet and the first exhaust steam outlet are connected to the heat source inlet; The heat source inlet includes a first heat source inlet and a second heat source inlet; The heat source outlet includes a first heat source outlet and a second heat source outlet; The heat source cavity includes a first heat source cavity and a second heat source cavity, the first heat source cavity and the second heat source cavity are spaced apart, the first heat source cavity is connected to the first heat source inlet and the first heat source outlet, and the second heat source cavity is connected to the second heat source inlet and the second heat source outlet. The first exhaust steam outlet is connected to the first heat source inlet, and the desulfurization heat source outlet is connected to the second heat source inlet; The cylinder includes an intermediate-pressure cylinder and a low-pressure cylinder. The intermediate-pressure cylinder has a first exhaust outlet, and the low-pressure cylinder has a second steam inlet and a second exhaust outlet. The first exhaust steam outlet is connected to the second steam inlet via a first pipeline; The first exhaust steam outlet is connected to the first heat source inlet via a second pipeline; The second exhaust outlet is connected to the inlet of the heated medium via a third pipeline; The flue gas desulfurization device includes: A flash tank, wherein the flash tank has a desulfurization slurry inlet, a cold slurry outlet and a flash steam outlet, and the flash steam outlet is connected to the second heat source inlet; A desulfurization tower is used to remove sulfur oxides from flue gas. The bottom of the desulfurization tower is provided with a desulfurization slurry outlet, which is connected to the desulfurization slurry inlet through a desulfurization slurry pipeline. A slurry pump is provided on the desulfurization slurry pipeline. The upper part of the desulfurization tower is provided with a cold slurry inlet, which is connected to the cold slurry outlet.

2. The waste heat utilization system for coupled flue gas desulfurization and seawater desalination according to claim 1, characterized in that, The second pipeline is equipped with a regulating valve, which is used to regulate the flow rate of the fluid in the second pipeline; The third pipeline is equipped with a first gate valve; The second exhaust steam outlet is connected to the inlet of the condenser via a fourth pipeline, and the outlet of the condensing chamber is connected to the inlet of the condenser.

3. The waste heat utilization system coupling flue gas desulfurization and seawater desalination according to claim 1, characterized in that, The flue gas desulfurization device includes a flue gas conveying pipeline and a desulfurization tower. The flue gas conveying pipeline is used to convey the flue gas to be desulfurized. The outlet of the flue gas conveying pipeline is connected to the inlet of the second heat source, and the outlet of the second heat source is connected to the flue gas inlet of the desulfurization tower.

4. The waste heat utilization system for coupled flue gas desulfurization and seawater desalination according to claim 1, characterized in that, The first heating element is a heat pump.

5. The waste heat utilization system for coupled flue gas desulfurization and seawater desalination according to claim 1, characterized in that, It includes a seawater delivery pipe, the outlet of which is connected to the inlet of the distillation chamber. The seawater delivery pipe is equipped with a seawater filter and a seawater booster pump. The seawater filter can filter the seawater entering the distillation chamber.

6. The waste heat utilization system coupled with flue gas desulfurization and seawater desalination according to claim 5, characterized in that, include A demineralized water tank, the inlet of which is connected to the demineralized steam outlet via a fifth pipeline, and a demineralized water pump is installed on the fifth pipeline; A concentrated brine tank, the inlet of which is connected to the concentrated brine outlet via a sixth pipeline, and a concentrated brine pump is installed on the sixth pipeline.

7. The waste heat utilization system for coupled flue gas desulfurization and seawater desalination according to claim 6, characterized in that, The fifth pipeline exchanges heat with the seawater delivery pipeline through a seawater preheater.

Images