Low-pressure steam recovery device of combined-soda system

Abstract

The utility model belongs to the technical field of low-pressure steam recovery, and particularly relates to a low-pressure steam recovery device of a combined-soda system. The system comprises a wastewater collecting tank, a low-pressure steam tank, a medium-pressure steam tank, a high-pressure steam tank and a hot water storage tank which are sequentially connected, a first pipeline is connected between the wastewater collecting tank and the low-pressure steam tank; a second pipeline is connected between the low-pressure steam tank and the medium-pressure steam tank; a third pipeline is connected between the medium-pressure steam tank and the high-pressure steam tank; and a fourth pipeline is connected between the high-pressure steam tank and the hot water storage tank. According to the low-pressure steam recovery device of the combined-soda system, the problems that in the current factory production process, low-pressure steam is excessive, and medium-pressure steam and high-pressure steam are insufficient are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-pressure steam recovery, and in particular relates to a low-pressure steam recovery device for a combined alkali system. Background Art

[0002] The chemical industry is one of the high-energy-consuming industries in my country, and its energy consumption accounts for a large proportion of the total energy consumption in the country, while the alkali industry is the largest energy consumer in the chemical industry. Since the reform and opening up, my country's alkali industry has developed rapidly. Therefore, it is very important to use the waste heat recovery process to carry out energy-saving transformation of the alkali system, further reduce the energy consumption per unit product, save energy, and improve economic benefits. The factory is already carrying out the alkali project, which includes the vacuum salt making system, the alkali system and the supporting public works. In the normal production process, each alkali process produces a total of about 260m³ / h of condensed water. The condensed water contains a lot of heat energy. If it is discharged directly, it will cause a lot of waste of resources.

[0003] At present, due to funding and technical problems, the recycling rate of condensed water in the steam system of most chemical plants is low. Some are directly discharged, and some are cooled and discharged again due to unqualified water quality after recycling. In the face of increasingly high environmental protection requirements, whether a low-pressure steam recovery device for the alkali-linked system can be designed to effectively recycle the reusable low-pressure steam condensed water discharged from the alkali-linked system, achieve zero discharge of low-pressure steam, and achieve the purpose of water conservation is a technical problem to be solved by the utility model. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a low-pressure steam recovery device for a combined alkali system, which effectively solves the problem of excess low-pressure steam and insufficient medium-pressure steam and high-pressure steam in the current factory production process.

[0005] The utility model discloses a low-pressure steam recovery device of a combined alkali system, comprising a wastewater collection tank, a low-pressure steam tank, a medium-pressure steam tank, a high-pressure steam tank, and a hot water storage tank connected in sequence;

[0006] A first pipeline is connected between the wastewater collection tank and the low-pressure steam tank, and a first pressure and temperature sensor, a cooler, a condensate pump, a first switch valve, and a second pressure and temperature sensor are installed on the first pipeline;

[0007] A second pipeline is connected between the low-pressure steam tank and the medium-pressure steam tank, and a third pressure and temperature sensor, a second switch valve, a steam jet heat pump and a fourth pressure and temperature sensor are sequentially installed on the second pipeline;

[0008] A third pipeline is connected between the medium-pressure steam tank and the high-pressure steam tank, and a fifth pressure and temperature sensor, a third switch valve, a pressurizing mechanism and a sixth pressure and temperature sensor are sequentially connected to the third pipeline;

[0009] A fourth pipeline is connected between the high-pressure steam tank and the hot water storage tank, and a seventh pressure-temperature sensor, a fourth switch valve, a pressure reducing valve and an eighth pressure-temperature sensor are sequentially connected to the fourth pipeline.

[0010] Optimally, the first pipeline is a first continuously bent pipeline; and a wastewater outlet pipe is connected to the bottom of the wastewater collection tank.

[0011] Further optimized, the bottom of the low-pressure steam tank is inclined, and the inclination direction of the bottom of the low-pressure steam tank is toward the first pipeline; the top of the low-pressure steam tank is also inclined, and the inclination direction of the top of the low-pressure steam tank is toward the second pipeline.

[0012] Further optimized, the inner top of the medium-pressure steam tank is a downwardly convex V-shaped structure, and the interfaces of the second pipeline and the third pipeline with the medium-pressure steam tank are respectively located on both sides of the V-shaped structure.

[0013] Further optimized, the pressurizing mechanism includes a heating chamber and an electromagnetic heater installed in the heating chamber, and the middle part of the third pipe is also installed in the heating chamber; the third pipe is a second continuous bent pipe, and the heating wire of the electromagnetic heater is coiled on the third pipe.

[0014] For further optimization, the medium-pressure steam tank and the high-pressure steam tank are also provided with a medium-pressure steam output pipe and a high-pressure steam output pipe.

[0015] The beneficial effects of the utility model are:

[0016] The device achieves steam balance inside the device, solving the contradiction of tight supply of medium-pressure steam and excess low-pressure steam in the process of combined alkali production.

[0017] With the continuous progress of various energy-saving technologies, energy-saving work will continue to move forward. As one of the measures for energy saving and consumption reduction, wastewater condensation flash evaporation has been widely used. The application of this application reduces energy consumption, and the fuel required for the boiler can be saved by 10%-15%, which improves energy utilization efficiency, reduces enterprise production costs, increases economic benefits, and enhances enterprise competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the utility model.

[0019] Figure 2It is an enlarged schematic diagram of the connection part between the wastewater collection tank and the low-pressure steam tank in the utility model.

[0020] Figure 3 It is an enlarged schematic diagram of the connection part between the medium-low pressure steam tank and the medium-pressure steam tank of the utility model.

[0021] Figure 4 It is an enlarged schematic diagram of the connection part between the medium-pressure steam tank and the high-pressure steam tank in the utility model.

[0022] Figure 5 It is an enlarged schematic diagram of the connection part between the high-pressure steam tank and the hot water storage tank in the utility model.

[0023] The attached drawings indicate: 1: wastewater collection tank, 2: low-pressure steam tank, 3: medium-pressure steam tank, 4: high-pressure steam tank, 5: hot water storage tank, 6: first pipeline, 7: first pressure-temperature sensor, 8: cooler, 9: condensation pump, 10: first switch valve, 11: second pressure-temperature sensor, 12: wastewater outlet pipe, 13: second pipeline, 14: third pressure-temperature sensor, 15: second switch valve, 16: steam jet heat pump, 17: fourth pressure-temperature sensor, 18: third pipeline, 19: fifth pressure-temperature sensor, 20: third switch valve, 21: sixth pressure-temperature sensor, 22: heating chamber, 23: electromagnetic heater, 24: heating wire, 25: fourth pipeline, 26: seventh pressure-temperature sensor, 27: fourth switch valve, 28: pressure reducing valve, 29: eighth pressure-temperature sensor, 30: medium-pressure steam output pipe, 31: high-pressure steam output pipe. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0026] It should be noted that in the present application, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0027] like Figure 1-5As shown, a low-pressure steam recovery device of a combined alkali system includes a wastewater collection tank 1, a low-pressure steam tank 2, a medium-pressure steam tank 3, a high-pressure steam tank 4, and a hot water storage tank 5 which are connected in sequence.

[0028] A first pipeline 6 is connected between the wastewater collection tank 1 and the low-pressure steam tank 2. A first pressure and temperature sensor 7, a cooler 8, a condensation pump 9, a first switch valve 10, and a second pressure and temperature sensor 11 are installed on the first pipeline 6. The first pressure and temperature sensor 7 and the second pressure and temperature sensor 11 respectively monitor the pressure and temperature values ​​at the inlet of the wastewater collection tank 1 and the interface of the low-pressure steam tank 2 at the first pipeline 6. The cooler 8 and the condensation pump 9 are used together to cool the low-pressure steam into condensed water and transmit it to the wastewater collection tank 1. The first switch valve 10 controls the switch of the first pipeline 6.

[0029] The first pipe 6 is a first continuous curved pipe, and the low-pressure steam is cooled autonomously by increasing the length of the first pipe 6. A wastewater outlet pipe 12 is connected to the bottom of the wastewater collection tank 1. When a large amount of water is stored in the wastewater collection tank 1, it can be drawn out from the wastewater outlet pipe 12, and a switch valve can also be set at the wastewater outlet pipe 12.

[0030] The bottom of the low-pressure steam tank 2 is tilted, and the tilt direction of the bottom of the low-pressure steam tank 2 is toward the first pipe 6. The top of the low-pressure steam tank 2 is also tilted, and the tilt direction of the top of the low-pressure steam tank 2 is toward the second pipe 13.

[0031] A second pipe 13 is connected between the low-pressure steam tank 2 and the medium-pressure steam tank 3. A third pressure and temperature sensor 14, a second switch valve 15, a steam jet heat pump 16 and a fourth pressure and temperature sensor 17 are sequentially installed on the second pipe 13. The steam jet heat pump 16 provides power and reheats the low-pressure steam transmitted from the low-pressure steam tank 2. The third pressure and temperature sensor 14 and the fourth pressure and temperature sensor 17 monitor the pressure and temperature values ​​at the interface between the low-pressure steam tank 2 and the second pipe 13 and the medium-pressure steam tank 3 at the interface of the second pipe 13 respectively. The second switch valve 15 controls the switch of the second pipe 13.

[0032] The inner top of the medium-pressure steam tank 3 is a downwardly convex V-shaped structure, and the interfaces of the second pipe 13 and the third pipe 18 with the medium-pressure steam tank 3 are respectively located on both sides of the V-shaped structure to prevent the steam that has just entered the medium-pressure steam tank 3 from being discharged immediately.

[0033] A third pipeline 18 is connected between the medium-pressure steam tank 3 and the high-pressure steam tank 4, and a fifth pressure and temperature sensor 19, a third switch valve 20, a pressurizing mechanism and a sixth pressure and temperature sensor 21 are sequentially connected to the third pipeline 18. The fifth pressure and temperature sensor 19 and the sixth pressure and temperature sensor 21 monitor the pressure and temperature values ​​at the interface between the medium-pressure steam tank 3 and the third pipeline 18 and the interface between the high-pressure steam tank and the third pipeline 18, respectively. The third switch valve 20 controls the switch of the third pipeline 18.

[0034] The pressurizing mechanism includes a heating chamber 22 and an electromagnetic heater 23 installed in the heating chamber 22. The middle part of the third pipe 18 is also installed in the heating chamber 22. The purpose of setting the heating chamber 22 is to ensure the heating efficiency of the electromagnetic heater 23. The third pipe 18 is a second continuous bending pipe. The heating wire 24 of the electromagnetic heater 23 is coiled on the third pipe 18. By lengthening the length of the pipe, the heating time of the steam is increased.

[0035] A fourth pipeline 25 is connected between the high-pressure steam tank 4 and the hot water storage tank 5, and a seventh pressure and temperature sensor 26, a fourth switch valve 27, a pressure reducing valve 28 and an eighth pressure and temperature sensor 29 are sequentially connected to the fourth pipeline 25. The seventh pressure and temperature sensor 26 and the eighth pressure and temperature sensor 29 monitor the pressure and temperature values ​​at the interface between the high-pressure steam tank and the fourth pipeline 25 and the interface between the hot water storage tank 5 and the fourth pipeline 25, respectively. The fourth switch valve 27 controls the switch of the fourth pipeline 25.

[0036] The medium-pressure steam tank 3 and the high-pressure steam tank 4 are also provided with a medium-pressure steam output pipe 30 and a high-pressure steam output pipe 31. When the medium-pressure steam and the high-pressure steam are needed, they can be output from the medium-pressure steam output pipe 30 and the high-pressure steam output pipe 31.

[0037] The first switch valve 10, the second switch valve 15, the third switch valve 20, and the fourth switch valve 27 can use ball valves; the first pressure and temperature sensor 7, the second pressure and temperature sensor 11, the third pressure and temperature sensor 14, the fourth pressure and temperature sensor 17, the fifth pressure and temperature sensor 19, the sixth pressure and temperature sensor 21, the seventh pressure and temperature sensor 26, and the eighth pressure and temperature sensor 29 can use PT2300T integrated temperature and pressure transmitter.

[0038] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A low-pressure steam recovery device for a combined alkali system, characterized in that: It includes a wastewater collection tank, a low-pressure steam tank, a medium-pressure steam tank, a high-pressure steam tank, and a hot water storage tank connected in sequence; A first pipeline is connected between the wastewater collection tank and the low-pressure steam tank, and a first pressure and temperature sensor, a cooler, a condensate pump, a first switch valve, and a second pressure and temperature sensor are installed on the first pipeline; A second pipeline is connected between the low-pressure steam tank and the medium-pressure steam tank, and a third pressure and temperature sensor, a second switch valve, a steam jet heat pump and a fourth pressure and temperature sensor are sequentially installed on the second pipeline; A third pipeline is connected between the medium-pressure steam tank and the high-pressure steam tank, and a fifth pressure and temperature sensor, a third switch valve, a pressurizing mechanism and a sixth pressure and temperature sensor are sequentially connected to the third pipeline; A fourth pipeline is connected between the high-pressure steam tank and the hot water storage tank, and a seventh pressure-temperature sensor, a fourth switch valve, a pressure reducing valve and an eighth pressure-temperature sensor are sequentially connected to the fourth pipeline.

2. A low-pressure steam recovery device for a combined alkali system according to claim 1, characterized in that: The first pipeline is a first continuously bent pipeline; the bottom of the wastewater collection tank is connected to a wastewater outlet pipe.

3. A low-pressure steam recovery device for a combined alkali system according to claim 2, characterized in that: The inner bottom of the low-pressure steam tank is inclined, and the inner bottom of the low-pressure steam tank is inclined toward the first pipeline; the inner top of the low-pressure steam tank is also inclined, and the inner top of the low-pressure steam tank is inclined toward the second pipeline.

4. A low-pressure steam recovery device for a combined alkali system according to claim 3, characterized in that: The inner top of the medium-pressure steam tank is a downwardly convex V-shaped structure, and the interfaces of the second pipeline and the third pipeline with the medium-pressure steam tank are respectively located on both sides of the V-shaped structure.

5. A low-pressure steam recovery device for a combined alkali system according to claim 4, characterized in that: The pressurizing mechanism includes a heating chamber and an electromagnetic heater installed in the heating chamber, and the middle part of the third pipe is also installed in the heating chamber; the third pipe is a second continuous bending pipe, and the heating wire of the electromagnetic heater is coiled on the third pipe.

6. A low-pressure steam recovery device for a combined alkali system according to claim 5, characterized in that: The medium-pressure steam tank and the high-pressure steam tank are also provided with a medium-pressure steam output pipe and a high-pressure steam output pipe.

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