Oil removal and collection device for oil-containing waste alkali liquor

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By combining an oil-alkali separation tank and a heating device with density separation technology, the problem of low oil removal efficiency of oily waste alkali solution is solved, achieving continuous and efficient oil removal and reducing the frequency of filter replacement and energy consumption.

CN223705295UActive Publication Date: 2025-12-23ZHEJIANG SATELLITE ENERGY CO LTD

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Patent Information

Application Number: CN202520340817.7
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2025-02-28
Publication Date: 2025-12-23
Estimated Expiration: 2035-02-28

AI Technical Summary

Technical Problem

Existing oil removal methods for oily waste alkaline solutions are inefficient and require frequent filter replacements, resulting in high costs and increased hazardous waste disposal expenses.

Method used

An oil-alkali separation tank is used to physically separate oil and alkali solution based on their density difference. A heating device ensures that the oil layer flows out smoothly. The upper layer of oil is collected in an oil collection tank, and the clean alkali solution enters a storage tank. A controller adjusts the valve flow rate to achieve continuous and efficient oil removal.

Benefits of technology

It achieves continuous and efficient oil removal, reduces reliance on filter elements, lowers energy consumption and replacement frequency, and reduces operating costs.

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Abstract

The utility model provides an oil removal and collection device for oil-containing waste alkali liquor, which comprises an oil-alkali separation tank, an oil-containing waste alkali liquor storage tank, an oil collection tank, an alkali liquor storage tank and a plurality of valve pipelines, the oil-alkali separation tank is provided with an oil-containing waste alkali liquid feeding port located in the middle of the oil-alkali separation tank, a first discharging port located in the middle of the oil-alkali separation tank and a second discharging port located in the top of the oil-alkali separation tank, and the discharging port of the oil-containing waste alkali liquid storage tank is connected with the oil-containing waste alkali liquid feeding port of the oil-alkali separation tank through a pipeline; a first discharging opening of the oil-alkali separation tank is connected with a feeding opening of the alkali liquor storage tank through a pipeline, a second discharging opening of the oil-alkali separation tank is connected with a feeding opening of the oil collection tank through a pipeline, and the oil-alkali separation tank is further provided with a heating device located at the top of the oil-alkali separation tank. According to the utility model, oil is continuously and efficiently removed by adopting a physical separation principle, external power does not need to be applied, the energy consumption is extremely low, and the oil removal filter element does not need to be frequently replaced.

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Description

TECHNICAL FIELD

[0001] The utility model relates to a waste lye collecting device, concretely relates to an oil-containing waste lye oil removal collecting device and belongs to the technical field of chemical industry environmental protection equipment. BACKGROUND

[0002] Propylene is an important organic chemical raw material, which is mainly used for producing polypropylene, acrylonitrile, propylene oxide, acrylic acid, isopropyl alcohol, n-butanol / octanol and acetone, etc. Under the background of rapid economic growth in China, the demand for propylene maintains steady growth. At present, the sources of propylene mainly include refinery catalysis, naphtha cracking, coal or methanol (MTO / MTP) and propane dehydrogenation (PDH), etc. Among them, the propane dehydrogenation (PDH) process has the advantages of high propylene yield, rich supporting downstream devices, low cost and high profit, etc. Among the currently industrialized propane dehydrogenation processes for producing propylene, the Oleflex process of UOP, the Catofin process of Lummus and the STAR process of Uhde company, etc. are mainly used, and the Oleflex process of UOP is currently the most widely used.

[0003] The PDH process reactor of UOP is a fluidized bed, and the reactor catalyst needs to be reduced by hydrogen after regeneration. Water is generated in the reduction process, and the water mixed in the process gas enters the downstream cryogenic separation device and may freeze and block the cold exchange equipment. Therefore, a drying and water removal device is arranged before the cryogenic separation device. The dryer needs to be regenerated after adsorption saturation, and the regenerated gas is heated and reversely introduced into the regenerated dryer to carry out water and hydrogen sulfide. Subsequently, the regenerated gas enters the alkali washing device for desulfurization. The alkali lye in the alkali washing device needs to be frequently updated after absorbing hydrogen sulfide, and waste alkali lye is inevitably generated and needs to be treated. In addition to water and hydrogen sulfide adsorbed in the dryer, the regenerated gas also carries a small amount of heavy components, which are condensed into oil in the downstream alkali washing device and mixed into the alkali lye. The treatment of waste alkali lye containing sulfur is generally biological treatment. The oil content of the alkali lye is too high in the treatment process, which greatly reduces the treatment capacity, and the oil itself also affects environmental protection emission.

[0004] The existing oil removal method generally uses a filter with a PP cotton filter element and a coalescer for oil removal. The oil removal amount is small, and frequent oil discharge operation is required for the filter and the coalescer to avoid premature breakthrough of the filter element. The service life of the filter element is also short, the replacement cost is high, and the replaced waste filter element needs to be treated, which increases the disposal cost of hazardous waste. UTILITY MODEL CONTENTS

[0005] Based on the above background, the purpose of the utility model is to provide an oil-containing waste lye oil removal collecting device, which can ensure the waste oil removal rate and does not need to frequently replace the oil removal filter element, and solve the problems of inefficient and continuous oil removal and high cost of the oil-containing waste lye in the prior art.

[0006] To achieve the above-mentioned utility model purposes, the utility model provides the following technical scheme:

[0007] An oil-containing waste lye oil removal and collection device, comprising an oil-alkali separation tank, an oil-containing waste lye storage tank, an oil collection tank, a lye storage tank and a plurality of valve pipes, the oil-alkali separation tank is provided with an oil-containing waste lye feeding port in the middle part of the oil-alkali separation tank, a first discharging port in the middle part of the oil-alkali separation tank and a second discharging port at the top of the oil-alkali separation tank, the discharging port of the oil-containing waste lye storage tank is connected with the oil-containing waste lye feeding port of the oil-alkali separation tank through a pipe, the first discharging port of the oil-alkali separation tank is connected with the feeding port of the lye storage tank through a pipe, the second discharging port of the oil-alkali separation tank is connected with the feeding port of the oil collection tank through a pipe, and the oil-alkali separation tank is further provided with a heating device at the top of the oil-alkali separation tank.

[0008] After the oil-containing waste lye enters the oil-alkali separation tank, the oil and the lye are stratified due to the different densities, the oil with small density is gathered in the upper layer and the waste lye with large density is gathered in the lower layer, the oil gathered in the upper layer enters the oil collection tank through the tank top pipeline, when the oil flowability is poor due to low temperature, the heating device at the top of the oil-alkali separation tank is opened for heating, and the clean waste lye after oil removal enters the lye storage tank through the middle pipeline of the oil-alkali separation tank for collection.

[0009] Preferably, the oil-alkali separation tank comprises a tank body and a cylinder body extending from the top of the tank body, the oil-containing waste lye feeding port is arranged at one side of the middle part of the outer wall of the tank body, the first discharging port is arranged at the other side of the middle part of the outer wall of the tank body, and the second discharging port is arranged at the side of the cylinder body.

[0010] Preferably, the heating device comprises a heating element and a control element, and the control element and the heating element are electrically connected.

[0011] Preferably, the oil-alkali separation tank, the oil-containing waste lye storage tank, the oil collection tank and the lye storage tank are respectively provided with liquid level measuring devices.

[0012] Preferably, the oil-alkali separation tank is further provided with a temperature measuring device.

[0013] Preferably, the oil-alkali separation tank is further provided with a pressure measuring device.

[0014] Preferably, a first flow monitoring device and a first valve are further arranged on the pipe connecting the oil-alkali separation tank and the oil-containing waste lye storage tank, a second flow monitoring device, a second valve and a sampling detection valve are further arranged on the pipe connecting the oil-alkali separation tank and the lye storage tank, and a third valve is further arranged on the pipe connecting the oil-alkali separation tank and the oil collection tank.

[0015] As preferred, the oil-containing waste lye oil removal collecting device further comprises a controller, the controller comprising a computer display unit and a computer control unit electrically connected, the computer control unit being electrically connected with the first valve, the second valve and the third valve respectively.

[0016] Compared with the prior art, the oil-containing waste lye oil removal collecting device has the following advantages:

[0017] The oil-containing waste lye oil removal collecting device has the advantages that physical separation principle is adopted for continuous and efficient oil removal, external power is not needed, energy consumption is extremely low, and the oil removal filter element does not need to be frequently replaced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0019] Figure 1 is a structural schematic view of the oil-containing waste lye oil removal collecting device of the present application;

[0020] Figure 2 is a structural schematic view of the oil lye separation tank in the present application;

[0021] In the figure: 1, oil lye separation tank; 2, oil-containing waste lye storage tank; 3, oil collecting tank; 4, lye storage tank; 11, oil-containing waste lye feeding port; 12, first discharging port; 13, second discharging port; 14, first heating device; 15, second heating device; 16, cylinder body; F1, first flow monitoring device; F2, second flow monitoring device; V1, first valve; V2, second valve; V3, third valve; V4, sampling detection valve. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be further described in detail below by specific embodiments and in combination with the drawings. It should be understood that the implementation of the present application is not limited to the following embodiments, and any form of modification and / or change of the present application will fall within the scope of protection of the present application.

[0023] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field. Unless otherwise specified, the components or equipment in the following embodiments are general standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following detailed description, many specific details are set forth to facilitate explanation and provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be practiced by those skilled in the art without these specific details.

[0025] An embodiment of this utility model discloses an oil removal and collection device for oily waste alkaline solution, such as... Figure 1 As shown, the device includes an oil-alkali separation tank 1, an oily waste alkali solution storage tank 2, an oil collection tank 3, an alkali solution storage tank 4, and several valves and pipes. The oil-alkali separation tank 1 has an oily waste alkali solution inlet 11 located in the middle of the tank, a first outlet 12 located in the middle of the tank, and a second outlet 13 located at the top of the tank. The outlet of the oily waste alkali solution storage tank 2 is connected to the oily waste alkali solution inlet 11 of the oil-alkali separation tank 1 via a pipe. The first outlet 12 of the oil-alkali separation tank 1 is connected to the inlet of the alkali solution storage tank 4 via a pipe. The second outlet 13 of the oil-alkali separation tank 1 is connected to the inlet of the oil collection tank 3 via a pipe. The oil-alkali separation tank 1 also has a heating device located at the top of the tank. The pipeline connecting the oil-alkali separation tank 1 and the oily waste alkali storage tank 2 is also equipped with a first flow monitoring device F1 and a first valve V1. The pipeline connecting the oil-alkali separation tank 1 and the alkali storage tank 4 is also equipped with a second flow monitoring device F2, a second valve V2 and a sampling and detection valve V4. The pipeline connecting the oil-alkali separation tank 1 and the oil collection tank 3 is also equipped with a third valve V3.

[0026] The oil-alkali separation tank 1, the oily waste alkali storage tank 2, the oil collection tank 3, and the alkali storage tank 4 are all equipped with level measuring devices. The oil-alkali separation tank 1 is also equipped with a temperature measuring device and a pressure measuring device. This oily waste alkali collection and removal device also includes a controller. The controller includes an electrically connected computer display unit and a computer control unit. The computer control unit is electrically connected to the first valve V1, the second valve V2, and the third valve V3, respectively. The computer display unit is electrically connected to the pressure measuring device, temperature measuring device, pH detection device, level measuring device, and flow monitoring device, displaying the specific measured values on the computer display unit. The separated alkali solution is sampled at the sampling and detection valve V4 to analyze its oil content, determining the optimal inlet and outlet flow rates, and controlling the valve opening within the computer control unit.

[0027] like Figure 2 As shown, the oil-alkali separation tank 1 includes a tank body and a cylindrical body 16 extending from the top of the tank body. The oily waste alkali inlet 11 is located on one side of the middle of the outer wall of the tank body, the first outlet 12 is located on the other side of the middle of the outer wall of the tank body, and the second outlet 13 is located on the side of the cylindrical body 16. The heating device includes a heating element and a control element, which are electrically connected. In this embodiment, two heating devices are provided, namely a first heating device 14 and a second heating device 15, respectively located on both sides of the top of the tank body.

[0028] The operation process of the oil-containing waste alkaline solution oil removal and collection device is as follows:

[0029] The oily alkali solution in oily waste alkali solution storage tank 2 is transported to oil-alkali separation tank 1 via pipeline. After oil-alkali separation tank 1 is filled, the oil and alkali solution separate into layers due to their different densities. The oil, with its lower density, accumulates on the upper layer and is transported to oil collection tank 3 through pipelines at point 16 on the top of the tank. If the oil has poor fluidity due to low temperature, the first and second electric heating devices on both sides of the top of the tank can be turned on for heating. The clean waste alkali solution after oil removal enters the alkali solution storage tank for collection through the conveying pipeline in the middle of the tank.

[0030] During this period, the controller's computer display unit displays the detection, measurement, or monitoring values from the pressure metering device, temperature metering device, liquid level metering device, and flow monitoring device. Simultaneously, the oil content of the separated alkali solution is analyzed by sampling and detection valve V4. Sampling and analysis are performed sequentially at different feed-to-discharge ratios to obtain the feed-to-discharge ratio with the lowest oil content. This flow rate is set in the computer control unit, and the controller controls the opening of the first valve V1 and the second valve V2 to stabilize this feed ratio, thereby achieving the optimal separation effect.

[0031] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the method and core idea of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. An oil removal and collection device for oily waste alkaline solution, characterized in that: The oil-containing waste alkali liquid degreasing and collection device includes an oil-alkali separation tank (1), an oil-containing waste alkali liquid storage tank (2), an oil collection tank (3), an alkali liquid storage tank (4), and several valves and pipes. The oil-alkali separation tank (1) is provided with an oil-containing waste alkali liquid inlet (11) located in the middle of the oil-alkali separation tank (1), a first outlet (12) located in the middle of the oil-alkali separation tank (1), and a second outlet (13) located at the top of the oil-alkali separation tank (1). The outlet of the oil-containing waste alkali liquid storage tank (2) is connected to the oil-containing waste alkali liquid inlet (11) of the oil-alkali separation tank (1) through a pipe. The first outlet (12) of the oil-alkali separation tank (1) is connected to the inlet of the alkali liquid storage tank (4) through a pipe. The second outlet (13) of the oil-alkali separation tank (1) is connected to the inlet of the oil collection tank (3) through a pipe. The oil-alkali separation tank (1) is also provided with a heating device located at the top of the oil-alkali separation tank (1).

2. The oil removal and collection device for oily waste alkaline solution according to claim 1, characterized in that: The oil-alkali separation tank (1) includes a tank body and a cylindrical body (16) extending from the top of the tank body. The oily waste alkali inlet (11) is located on one side of the middle of the outer wall of the tank body, the first outlet (12) is located on the other side of the middle of the outer wall of the tank body, and the second outlet (13) is located on the side of the cylindrical body (16).

3. The oil removal and collection device for oily waste alkaline solution according to claim 2, characterized in that: The heating device includes a heating element and a control element, and the control element and the heating element are electrically connected.

4. The oil removal and collection device for oily waste alkaline solution according to claim 1, characterized in that: The oil-alkali separation tank (1), the oil-containing waste alkali liquid storage tank (2), the oil collection tank (3), and the alkali liquid storage tank (4) are all equipped with liquid level metering devices.

5. The oil removal and collection device for oily waste alkaline solution according to claim 1, characterized in that: The oil-alkali separation tank (1) is also equipped with a temperature metering device.

6. The oil removal and collection device for oily waste alkaline solution according to claim 1, characterized in that: The oil-alkali separator (1) is also equipped with a pressure metering device.

7. The oil removal and collection device for oily waste alkaline solution according to claim 1, characterized in that: The pipeline connecting the oil-alkali separation tank (1) and the oily waste alkali storage tank (2) is also equipped with a first flow monitoring device (F1) and a first valve (V1). The pipeline connecting the oil-alkali separation tank (1) and the alkali storage tank (4) is also equipped with a second flow monitoring device (F2), a second valve (V2) and a sampling detection valve (V4). The pipeline connecting the oil-alkali separation tank (1) and the oil collection tank (3) is also equipped with a third valve (V3).

8. The oil removal and collection device for oily waste alkaline solution according to claim 7, characterized in that: The oil-containing waste alkaline liquid oil removal and collection device also includes a controller, which includes an electrically connected computer display unit and a computer control unit. The computer control unit is electrically connected to the first valve (V1), the second valve (V2), and the third valve (V3), respectively.