Heat recovery device for liquid phase oxidation system

Abstract

The utility model relates to the technical field of organic wastewater treatment, in particular to a heat recovery device for a liquid phase oxidation system, which comprises a reaction tank, and a feed port and a first water outlet which are arranged on the side wall of the reaction tank, the top of the reaction tank is connected with a steam pipe, the upper side of the steam pipe is provided with a control valve, one end of the steam pipe is connected with a cooling tank, and the other end of the steam pipe is provided with a second water outlet. A heat exchange pipe is arranged on the inner side of the cooling tank, and a condensate pipe is connected to the bottom of the cooling tank; filler is arranged on the inner side of the cooling tank, an upper access hole and a lower access hole are formed in the cooling tank, the steam pipe is communicated with the inner side of the cooling tank, a drainage sieve is arranged at the bottom of the inner side of the cooling tank, and one end of the condensate pipe extends into the drainage sieve. Filler is arranged in the cooling tank, steam is filtered, the flowing speed of the steam is slowed down, the heat exchange pipes and heat exchange media in the heat exchange pipes are heated, the heat exchange media make contact with medium-temperature condensate water firstly and then make contact with high-temperature steam, the heat conduction efficiency is effectively guaranteed, and the heat recovery rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to organic wastewater treatment technical field especially relates to a heat recovery device for liquid phase oxidation system. BACKGROUND

[0002] In recent years, with the development of industrialization, the water resources for human survival is increasingly polluted. One of the main sources of water quality deterioration is the discharge of organic wastewater, especially the wastewater of petroleum, pesticide and chemical industry. These wastewaters are difficult to be removed due to their complex chemical composition, high toxicity, high COD content and other characteristics.

[0003] At present, there are many different treatment processes for organic wastewater, among which the wet oxidation process or micro-evaporation liquid phase oxidation technology needs to oxidize organic matter in wastewater into small molecular inorganic matter under certain temperature and pressure conditions. The technology has wide application range, fast oxidation rate and slight secondary pollution. However, when the reaction heat value is large in this kind of process, the treated gas-liquid phase is directly cooled, which will waste most of the energy, and does not conform to the theme of energy saving and environmental protection. The existing heat recovery device has simple structure and low recovery efficiency. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the shortcomings in the prior art and provides a heat recovery device for liquid phase oxidation system.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A heat recovery device for liquid phase oxidation system, comprising a reaction tank, a feed inlet and a first water outlet arranged on the side wall of the reaction tank, a steam pipe connected to the top of the reaction tank, a control valve arranged on the upper side of the steam pipe, a cooling tank connected to one end of the steam pipe, a heat exchange pipe arranged inside the cooling tank, and a condensate water pipe connected to the bottom of the cooling tank.

[0007] Preferably, the control valve is provided with a temperature sensor and a pressure sensor, and the control valve is an electromagnetic valve.

[0008] Preferably, the heat exchange pipe is arranged in a spiral shape, and the two ends of the heat exchange pipe penetrate through the cooling tank and are connected to a water inlet and a second water outlet respectively.

[0009] Preferably, the heat exchange pipe is sleeved outside the drainage sieve, and a water permeation hole is arranged on the drainage sieve.

[0010] Preferably, the cooling tank is provided with a pressure limiting valve on the upper side, and the steam pipe is wrapped with a heat preservation sleeve.

[0011] Preferably, the condensate pipe is provided with a water storage bend, and the outlet of the condensate pipe is located at the middle of the cooling tank.

[0012] The utility model discloses the beneficial effect that:

[0013] Compared with the prior art, the utility model discloses the packing in cooling tank is arranged, filters steam, and the steam flow speed is slowed down, and the state of upper steam and lower condensate water is formed in the cooling tank, and the heat exchange pipe and the internal heat exchange medium are heated, the heat exchange medium contacts the medium-temperature condensate water first, and then contacts high-temperature steam, effectively guarantees the heat conduction efficiency, and improves the heat recovery rate. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is three-dimensional structure schematic diagram of the heat recovery device for liquid phase oxidation system that the utility model proposes;

[0015] Fig. 2 It is cooling tank main view section structure schematic diagram of the heat recovery device for liquid phase oxidation system that the utility model proposes;

[0016] Fig. 3 It is cooling tank three-dimensional structure schematic diagram of the heat recovery device for liquid phase oxidation system that the utility model proposes.

[0017] In the drawing: 1, reaction tank;2, feed inlet;3, first water outlet;4, steam pipe;5, control valve;6, cooling tank;61, pressure limiting valve;62, upper access hole;63, lower access hole;7, heat exchange pipe;71, water inlet;72, second water outlet;8, condensate pipe;81, drainage screen;9, packing. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0019] Reference Figs. 1-3The application discloses a heat recovery device for a liquid-phase oxidation system, which comprises a reaction tank 1, a feed inlet 2 and a first water outlet 3 arranged on the side wall of the reaction tank 1, the feed inlet 2 is used for feeding wastewater containing oxygen, the wastewater is oxidized and heated in the reaction tank 1 to realize decomposition of organic matters, wastewater treatment is completed, and finally the wastewater is discharged through the first water outlet 3, a steam pipe 4 is connected to the top of the reaction tank 1, steam and waste gas generated in the oxidation reaction are discharged through the steam pipe 4, a control valve 5 is arranged on the upper side of the steam pipe 4, a temperature sensor and a pressure sensor are arranged on the control valve 5, the control valve 5 is an electromagnetic valve, the temperature sensor and the pressure sensor detect the temperature and pressure of steam in the steam pipe 4, the electromagnetic valve is controlled to open and close, and steam is discharged, so that the temperature and pressure in the reaction tank 1 are kept stable.

[0020] One end of the steam pipe 4 is connected with a cooling tank 6, the steam pipe 4 is communicated with the inner side of the cooling tank 6, steam is guided into the cooling tank 6 to be cooled, a pressure limiting valve 61 is arranged on the upper side of the cooling tank 6, when the pressure in the cooling tank 6 is too high, the pressure limiting valve 61 is opened to release the pressure, so that the equipment is prevented from being damaged, and a heat preservation sleeve is wrapped outside the steam pipe 4, so that the heat preservation effect is improved and heat loss is avoided.

[0021] The inner side of the cooling tank 6 is provided with a heat exchange pipe 7, the heat exchange pipe 7 is arranged in a spiral shape, the heat exchange pipe 7 penetrates through the cooling tank 6 at both ends and is connected with a water inlet 71 and a second water outlet 72 respectively, the water inlet 71 is located on the lower side of the second water outlet 72, and the second water outlet 72 is close to the steam pipe 4, heat exchange medium is supplied from the bottom to the top, the heat exchange medium absorbs the heat of steam in the cooling tank 6, the heat conduction time is prolonged, the temperature of the heat exchange medium in the second water outlet 72 is ensured to be close to the steam temperature of the steam pipe 4, and the heat conduction effect is ensured.

[0022] The bottom of the cooling tank 6 is connected with a condensate pipe 8 for discharging condensate, the condensate pipe 8 is provided with a water storage bend for accumulating condensate, so that the steam flow speed is slowed down, the heat transfer is ensured, the height of the outlet of the condensate pipe 8 is located at the middle position of the cooling tank 6, so that the water storage is ensured, and the heat exchange time of the heat exchange pipe 7 is ensured.

[0023] The inner side of the cooling tank 6 is provided with a filler 9, the filler 9 is made of high-heat-conducting material and is processed into a honeycomb shape, a large number of channels and pores are arranged, steam contacts the filler 9 to complete heat conduction and simultaneously adsorb particulate impurities, the cooling tank 6 is provided with an upper manhole 62 and a lower manhole 63 for replacing and cleaning the filler 9, the inner side of the bottom of the cooling tank 6 is provided with a drainage screen 81, one end of the condensate pipe 8 extends into the drainage screen 81, the heat exchange pipe 7 is sleeved outside the drainage screen 81, and a water seepage hole is formed in the drainage screen 81 to recycle the condensed distilled water into the condensate pipe 8.

[0024] In this embodiment, the wastewater is oxidized and heated in the reaction tank 1 to decompose organic matter, and is in a micro-evaporation and micro-boiling state to generate steam, which enters the steam pipe 4. In the initial stage, the control valve 5 is closed to ensure the temperature and pressure in the reaction tank 1. When the temperature in the reaction tank 1 reaches 159 DEG C and the pressure reaches 0.6 MPa, the control valve 5 is opened to start discharging steam. The steam enters the cooling tank 6 and contacts the packing 9 to conduct heat out, thereby heating the packing 9 and the heat exchange pipe 7. At the same time, the heat exchange medium, such as water or oil, is introduced into the water inlet 71 of the heat exchange pipe 7 to absorb the heat emitted by the steam for heat recovery and reuse. During this period, the steam flows from top to bottom. Due to the characteristics of hot gas, the upper part of the cooling tank 6 is accumulated, and the temperature of the upper part is higher than that of the lower part. Therefore, the heat exchange medium flows from bottom to top and can be gradually heated until the temperature of the heat exchange medium approaches that of the steam, and the heat transfer is completed.

[0025] The steam is condensed into distilled water, which flows into the condensate pipe 8 through the drain screen 81 for subsequent recovery.

[0026] The above merely describes a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application.

[0027] It should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0028] The relative arrangement, numerical expressions and values of the components and steps set forth in the embodiments are not intended to limit the scope of the present application, unless otherwise specifically stated. It should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion. The techniques, methods and devices known to those skilled in the art can not be discussed in detail, but should be considered as part of the authorized specification, if appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A heat recovery device for liquid phase oxidation system, comprising a reaction tank (1) and a feed inlet (2) and a first water outlet (3) arranged on the side wall of the reaction tank (1), characterized in that, The reaction tank (1) top is connected with steam pipe (4), the steam pipe (4) upside is equipped with control valve (5), steam pipe (4) one end is connected with cooling tank (6), the cooling tank (6) inside is equipped with heat exchange pipe (7), the cooling tank (6) bottom is connected with condensate pipe (8); The cooling tank (6) inside is equipped with filler (9), the cooling tank (6) top is equipped with upper access hole (62) and lower access hole (63), the steam pipe (4) is communicated with the inside of cooling tank (6), the cooling tank (6) inside bottom is equipped with drainage screen (81), the condensate pipe (8) one end extends into drainage screen (81) inside.

2. The heat recovery device for a liquid phase oxidation system according to claim 1, characterized by The control valve (5) is equipped with temperature sensor and pressure sensor, the control valve (5) adopts solenoid valve.

3. The heat recovery device for a liquid phase oxidation system according to claim 1, characterized by The heat exchange pipe (7) is spirally arranged, the heat exchange pipe (7) both ends are through cooling tank (6), are connected inlet (71) and second water outlet (72) respectively, the inlet (71) is located second water outlet (72) downside.

4. The heat recovery device for a liquid phase oxidation system according to claim 3, characterized in that, The heat exchange pipe (7) is sleeved on the outside of drainage screen (81), the drainage screen (81) is opened with water seepage hole.

5. The heat recovery device for a liquid phase oxidation system according to claim 1, characterized by The cooling tank (6) upside is equipped with pressure limiting valve (61), the steam pipe (4) outside is wrapped with heat preservation sleeve.

6. The heat recovery device for a liquid phase oxidation system according to claim 1, characterized by The condensate pipe (8) is equipped with water storage bend, the condensate pipe (8) outlet height is located in the middle position of cooling tank (6).

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