Water-saving device for recovering flue gas condensed water

Abstract

The invention relates to the technical field of flue gas condensation, and discloses a water-saving device for flue gas condensed water recovery, which comprises a main body component and a shell, one side of the shell is provided with a flue gas inlet, and the other side of the shell is provided with a flue gas outlet; the collecting mechanism comprises a condensed water collecting unit and a flue gas heat exchange unit, the condensed water collecting unit is installed in the shell, the condensed water collecting unit is installed at one end of the shell, flue gas heat exchanges heat with cold water in the flue gas heat exchange unit through the pipe wall of a heat exchange pipe, and the cold water absorbs heat energy of flue gas to achieve flue gas cooling; meanwhile, sulfur oxides, carbon dioxide and ammonia gas in the flue gas enter flue gas condensed water, emission and thermal pollution of sulfur dioxide and carbon dioxide in the flue gas are reduced, and meanwhile, the flue gas condensed water can flow into a condensed water collecting unit along with the flue gas through an internal flow guide plate; the bottom plate of the flue gas heat exchange unit with the inclined angle not only helps flue gas condensed water to enter the collecting unit, but also prevents the condensed water from overflowing out of the flue gas outlet along with flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas condensation, and in particular to a water-saving device for recovering flue gas condensate. Background Art

[0002] Integrated gasification combined cycle (IGCC) power generation technology is a clean coal power generation technology that integrates coal gasification technology and high-efficiency gas-steam combined cycle power generation system. It is recognized as the cleanest coal-fired power generation technology in the world. The water vapor contained in the flue gas after the synthesis gas is burned in this technology is much higher than the water vapor content in the flue gas discharged by traditional coal-fired power plants. The water vapor in the flue gas will take away a lot of heat in the gaseous state, making the thermal efficiency low, which not only causes a lot of energy waste but also aggravates the thermal pollution of the environment. Therefore, a flue gas condensation energy-saving device is needed to recover the energy contained in the flue gas and increase the efficiency of energy utilization. Summary of the invention

[0003] In view of the problems existing in the above-mentioned existing water-saving devices for recovering flue gas condensate, the present invention is proposed.

[0004] Therefore, the purpose of the present invention is to provide a water-saving device for recovering flue gas condensate, and its purpose is: in order to improve the secondary utilization efficiency of fresh water resources, a flue gas condensate recovery device is provided, which can recover flue gas condensate and make rational use of it, thereby reducing the use of fresh water for cooling water in power plants.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a water-saving device for recovering flue gas condensate comprises a main body component, including a shell, a flue gas inlet is installed on one side of the shell, and a flue gas outlet is installed on the other side of the shell; a collecting mechanism is located inside the main body component, the collecting mechanism comprises a condensate collecting unit and a flue gas heat exchange unit, the condensate collecting unit is installed inside the shell, and the condensate collecting unit is installed at one end of the shell.

[0006] As a preferred solution of the water-saving device for recovering flue gas condensate of the present invention, the flue gas heat exchange unit includes a circulating water inlet, a circulating water outlet and a plurality of heat exchange tubes connected in parallel and / or in series.

[0007] As a preferred solution of the water-saving device for recovering flue gas condensate described in the present invention, one end of the circulating water inlet is fixedly connected to the heat exchange tube, the other side of the heat exchange tube is fixedly connected to the circulating water outlet, and a condensate circulating water tank is installed on one side of the circulating water inlet.

[0008] As a preferred solution of the water-saving device for recovering flue gas condensate of the present invention, the condensate collecting unit includes a guide plate fixedly connected inside the shell, and a flue gas condensate regulating tank is installed on one side of the condensate collecting unit.

[0009] As a preferred solution of the water-saving device for recovering flue gas condensate described in the present invention, a switch is provided at the pipe where the condensate flows out of the condensate collection unit, and the pipe is connected to the flue gas condensate regulating tank to process the condensate and reuse it in the power plant.

[0010] As a preferred solution of the water-saving device for recovering flue gas condensate described in the present invention, the flue gas inlet pumps cold water in the condensate circulating water tank into the circulating water inlet through a water pump, and the circulating water flows through the heat exchange tube, and the condensate flows into the condensate collection unit.

[0011] As a preferred solution of the water-saving device for recovering flue gas condensate of the present invention, the flue gas inlet is arranged at the upper left side of the shell, and the flue gas flows out from the flue gas outlet at the lower right side of the shell after being cooled.

[0012] As a preferred solution of the water-saving device for recovering flue gas condensate described in the present invention, the flue gas heat exchange unit is provided with a bottom plate, the bottom plate has an inclined angle, and the bottom plate on one side of the flue gas heat exchange unit is inclined 10° toward the condensate collection unit.

[0013] As a preferred solution of the water-saving device for recovering flue gas condensate described in the present invention, the shell is provided with a chimney, and the chimney is arranged on the upper right side of the shell. After the flue gas passes through the shell, it flows into the chimney from the flue gas outlet for discharge.

[0014] As a preferred solution of the water-saving device for recovering flue gas condensate described in the present invention, a waste heat boiler is installed on one side of the flue gas heat exchange unit through an induced draft fan, and the flue gas of the waste heat boiler is in a negative pressure state, which is used to adjust the flow rate of the induced draft fan to control the condensation effect and the amount of condensate generated.

[0015] The beneficial effects of the present invention are as follows: the heat of the flue gas is exchanged with cold water through the tube wall of the heat exchange tube in the flue gas heat exchange unit, the cold water absorbs the heat energy of the flue gas to cool the flue gas, and at the same time, the sulfur oxides, carbon dioxide and ammonia in the flue gas enter the flue gas condensation water, reducing the emission of sulfur dioxide and carbon dioxide in the flue gas and thermal pollution.

[0016] The flue gas inlet and outlet are located above and below the two sides of the flue gas heat exchange unit, respectively. At the same time, the internal guide plate is conducive to the flue gas condensate flowing into the condensate collection unit with the flue gas. The bottom plate of the flue gas heat exchange unit with an inclined angle not only helps the flue gas condensate enter the collection unit but also prevents the condensate from overflowing the flue gas outlet with the flue gas. The condensate obtained is recycled as cooling water for the power plant after simple water treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 It is a schematic diagram of the heat exchange unit of the present invention.

[0018] Figure 2 It is a top view of the heat exchange unit of the present invention.

[0019] Figure 3 It is a cross-sectional schematic diagram of the heat exchange unit of the present invention.

[0020] Figure 4 It is a schematic diagram of the overall process flow of the present invention.

[0021] In the figure: 100. Main body; 101. Shell; 200. Collecting mechanism; 102. Smoke inlet; 103. Smoke outlet; 202b. Circulating water outlet; 202a. Circulating water inlet; 201a. Guide plate; 203. Bottom plate; 201. Condensate collecting unit; 202c. Heat exchange tube; 104. Waste heat boiler; 104a. Induced draft fan; 106. Water pump; 202. Smoke heat exchange unit; 105. Condensate circulating water tank; 201b. Smoke condensate regulating tank; 107. Chimney. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Example 1, reference Figures 1 to 3 , which is the first embodiment of the present invention, provides a water-saving device for recovering flue gas condensate, the device comprising a main body component 100, comprising a shell 101, a flue gas inlet 102 is installed on one side of the shell 101, and a flue gas outlet 103 is installed on the other side of the shell 101; a collecting mechanism 200, located inside the main body component 100, the collecting mechanism 200 comprises a condensate collecting unit 201 and a flue gas heat exchange unit 202, the condensate collecting unit 201 is installed inside the shell 101, and the condensate collecting unit 201 is installed at one end of the shell 101.

[0027] Specifically, the flue gas heat exchange unit 202 includes a circulating water inlet 202a, a circulating water outlet 202b and a plurality of heat exchange tubes 202c connected in parallel and / or in series, one end of the circulating water inlet 202a is fixedly connected to the heat exchange tube 202c, the other side of the heat exchange tube 202c is fixedly connected to the circulating water outlet 202b, a condensate circulating water tank 105 is installed on one side of the circulating water inlet 202a, the condensate collection unit 201 includes a guide plate 201a fixedly connected to the inside of the shell 101, and a flue gas condensate regulating tank 201b is installed on one side of the condensate collection unit 201.

[0028] Furthermore, a switch is provided at the pipe through which the condensate flows out of the condensate collection unit 201, and the pipe is connected to the flue gas condensate regulating tank 201b to process the condensate and reuse it in the power plant.

[0029] The flue gas inlet 102 pumps cold water in the condensate circulating water tank 105 into the circulating water inlet 202a through the water pump 106 , and the circulating water flows through the heat exchange tube 202c , and the condensate flows into the condensate collecting unit 201 .

[0030] Specifically, the circulating water inlet 202a is connected to one end of a group of heat exchange tubes 202c, and the other ends of these heat exchange tubes 202c are connected to the circulating water outlet 202b, forming a complete water circulation system. In addition, the circulating water inlet 202a is also directly connected to the condensed water circulating water tank 105 to ensure the continuous supply of cooling water.

[0031] When the device is running, the waste heat boiler is connected to the flue gas inlet 102 of the flue gas heat exchange unit 202 through an external pipeline, and the water pump 106 is used to extract cold water from the condensed water circulation water tank 105 and introduce it into the circulating water inlet 202a of the flue gas heat exchange unit 202. As the cold water flows in the heat exchange tube 202c in the shell 101, it exchanges heat with the high-temperature flue gas, causing the flue gas temperature to drop, thereby causing the water vapor in the flue gas to condense into liquid water. Under the guidance of the guide plate 201a, these condensed waters flow smoothly into the condensed water collection unit 201. In order to facilitate management and control, a switch is installed on the outlet pipe of the condensed water collection unit 201, through which the discharge of condensed water to the flue gas condensed water regulating tank 201b can be controlled. Finally, the treated condensed water can be safely reused in other water use links of the power plant, realizing the effective recycling of water resources.

[0032] In short, the design of this flue gas condensate recovery and water-saving device not only reflects technological innovation, but also demonstrates good economic and environmental benefits in practical applications, which is of great significance for promoting the sustainable development of the power industry.

[0033] Example 2, reference Figures 1 to 3 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the flue gas heat exchange unit 202 is provided with a bottom plate 203, the bottom plate 203 has an inclined angle, and the bottom plate 203 on one side of the flue gas heat exchange unit 202 is inclined 10° toward the condensate collection unit 201.

[0034] In order to further improve the performance and efficiency of the flue gas condensate recovery and water-saving device, a flue gas heat exchange unit 202 with unique structural characteristics is specially designed. A bottom plate 203 with a 10° inclination angle is installed at the bottom of the unit. This design cleverly promotes the natural flow of condensate, allowing it to flow more smoothly into the condensate collection unit 201, reducing the possibility of water droplets remaining, thereby improving the water recovery rate. Such a structure not only simplifies the maintenance of the device, but also ensures the long-term stable operation of the system.

[0035] Furthermore, the shell 101 is provided with a chimney 107 , which is arranged at the upper right side of the shell 101 . After the smoke passes through the shell 101 , it flows into the chimney 107 from the smoke outlet 103 to be discharged.

[0036] A chimney 107 is provided on the right side above the housing 101 of the device. This location is chosen to optimize the flue gas discharge path and ensure that the flue gas can be discharged efficiently and smoothly after being fully cooled and condensed water is recovered. In this way, not only can the energy waste caused by the direct discharge of untreated high-temperature flue gas be avoided, but also the thermal pollution to the surrounding environment can be reduced, showing the positive role of the device in environmental protection.

[0037] When in use, a waste heat boiler 104 is installed on one side of the flue gas heat exchange unit 202 through an induced draft fan 104a. The flue gas of the waste heat boiler 104 is in a negative pressure state, which is used to adjust the flow of the induced draft fan 104a to control the condensation effect and the amount of condensed water produced.

[0038] In actual application, one side of the flue gas heat exchange unit 202 is connected to the waste heat boiler 104 through the induced draft fan 104a, forming a closed-loop system. The waste heat boiler 104 maintains a negative pressure state, which not only helps to improve the fluidity of the flue gas, but also can finely control the condensation effect of the flue gas and the production of condensed water by adjusting the flow of the induced draft fan 104a. This flexible adjustment mechanism enables the device to maintain the best working state under different working conditions, whether facing high load or low load operation, it can ensure high efficiency and energy saving while achieving maximum recovery of condensed water.

[0039] In summary, this flue gas condensate recovery and water-saving device has shown significant advantages in improving water resource utilization, energy conservation and emission reduction in power plants with its unique design and excellent functions. It can not only effectively recycle condensate in flue gas and reduce the demand for fresh water, but also significantly reduce energy consumption and reduce the impact on the environment. It is an ideal choice for promoting the green transformation of the power industry.

[0040] Example 3, reference Figures 1 to 4 , which is the third embodiment of the present invention.

[0041] Specific process: the hot flue gas discharged from the waste heat boiler of the power plant passes through the flue gas heat exchange unit 202. The hot flue gas inlet 102 of the flue gas heat exchange unit 202 is located at the upper position of one side of the flue gas heat exchange unit 202. The hot flue gas passes through the gas guide plate 201a in the flue gas heat exchange unit 202 and contacts with a plurality of heat exchange tubes 202c. A plurality of heat exchange tubes 202c are connected in parallel and in series between the flue gas guide plates 201a. The bottom plate 203 of the flue gas heat exchange unit 202 is inclined 10° toward the flue gas condensate collection unit 201, which is conducive to the condensate flowing into the collection unit to collect the condensate, while preventing the condensate from overflowing with the cold flue gas outlet 103.

[0042] The flue gas inlet 102 and outlet are respectively located above and below the two sides of the flue gas heat exchange unit 202, and the guide plate 201a inside the flue gas heat exchange unit 202 is conducive to the flue gas condensate flowing into the condensate collection unit 201 along with the flue gas. It can not only guide the flue gas condensate but also further purify the flue gas, thereby enhancing the removal of ammonia, carbon dioxide and sulfur oxides after the flue gas is treated by SCR.

[0043] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be changed or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0044] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A water-saving device for recovering flue gas condensate, characterized in that: include, The main body component (100) comprises a shell (101), a smoke inlet (102) being installed on one side of the shell (101), and a smoke outlet (103) being installed on the other side of the shell (101); A collecting mechanism (200) is located inside the main body component (100), the collecting mechanism (200) comprises a condensate collecting unit (201) and a flue gas heat exchange unit (202), the condensate collecting unit (201) is installed inside the shell (101), and the condensate collecting unit (201) is installed at one end of the shell (101); The flue gas heat exchange unit (202) comprises a circulating water inlet (202a), a circulating water outlet (202b), and a plurality of heat exchange tubes (202c) connected in parallel and / or in series; One end of the circulating water inlet (202a) is fixedly connected to the heat exchange tube (202c), the other side of the heat exchange tube (202c) is fixedly connected to the circulating water outlet (202b), and one side of the circulating water inlet (202a) is installed with a condensed water circulating water tank (105); The condensate collection unit (201) comprises a guide plate (201a) fixedly connected inside the shell (101), a flue gas condensate regulating tank (201b) is installed on one side of the condensate collection unit (201), and a plurality of heat exchange tubes (202c) are connected in parallel and in series and are located between the guide plates (201a).

2. The water-saving device for recovering flue gas condensate according to claim 1 is characterized in that: A switch is provided at the pipe through which the condensate flows out of the condensate collection unit (201), and the pipe is connected to the flue gas condensate regulating tank (201b) to process the condensate and reuse it in the power plant.

3. The water-saving device for recovering flue gas condensate according to claim 2 is characterized in that: The flue gas inlet (102) pumps cold water in the condensate circulating water tank (105) into the circulating water inlet (202a) via a water pump (106); the circulating water flows through the heat exchange tube (202c), and the condensate flows into the condensate collecting unit (201).

4. The water-saving device for recovering flue gas condensate according to claim 3 is characterized in that: The smoke inlet (102) is arranged at the upper left side of the shell (101), and the smoke flows out from the smoke outlet (103) at the lower right side of the shell (101) after being cooled.

5. The water-saving device for recovering flue gas condensate according to claim 4 is characterized in that: The flue gas heat exchange unit (202) is provided with a bottom plate (203), and the bottom plate (203) has an inclined angle, and the bottom plate (203) on one side of the flue gas heat exchange unit (202) is inclined at 10° toward the condensed water collection unit (201).

6. The water-saving device for recovering flue gas condensate according to claim 5 is characterized in that: The shell (101) is provided with a chimney (107), and the chimney (107) is arranged on the upper right side of the shell (101). After the smoke passes through the shell (101), it flows into the chimney (107) from the smoke outlet (103) for discharge.

7. The water-saving device for recovering flue gas condensate according to claim 6 is characterized in that: A waste heat boiler (104) is installed on one side of the flue gas heat exchange unit (202) via an induced draft fan (104a); the flue gas of the waste heat boiler (104) is in a negative pressure state, and is used to adjust the flow rate of the induced draft fan (104a) to control the condensation effect and the amount of condensed water generated.

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