Ethanol recovery wastewater treatment device

Abstract

The utility model discloses an ethanol recovery wastewater treatment device which comprises an ethanol product tower and a sewage treatment plant which are connected through a sewage delivery pipe, a tower kettle delivery pump is arranged on the sewage delivery pipe, and sewage in the ethanol product tower is delivered into the sewage treatment plant through the tower kettle delivery pump to be treated. The device further comprises a thermoelectric combustion boiler, a flow dividing pipe is arranged between the thermoelectric combustion boiler and the sewage conveying pipe, a thermoelectric boundary area valve is arranged on the flow dividing pipe, a sewage boundary area valve is arranged at the feeding port end of the sewage treatment plant, and the flow direction of the wastewater output by the tower kettle delivery pump is controlled through the thermoelectric boundary area valve and the sewage boundary area valve. The used equipment is simple, low in energy consumption, less in investment, energy-saving, efficient and environment-friendly, so that the sewage treatment cost is greatly reduced, and the price advantage of the product is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ethanol recovery wastewater reconstruction, specifically relates to an ethanol recovery wastewater treatment device. BACKGROUND

[0002] Ethanol, an organic compound, is commonly known as alcohol, which is the most common monohydric alcohol. It is a colorless transparent liquid at normal temperature and pressure, which is flammable and volatile, low toxicity, pure liquid cannot be directly drunk, has a special fragrance, and slightly stimulates; slightly sweet and accompanied by stimulating pungent taste. It is flammable, its vapor can form an explosive mixture with air, and can be miscible with water in any ratio. It can be mixed with chloroform, diethyl ether, methanol, acetone and most other organic solvents.

[0003] There are two ways to treat the wastewater generated by ethanol recovery at present: one is to directly send the ethanol recovery device to the park wastewater treatment plant: the ethanol-containing wastewater separated from the ethanol product tower of the ethanol recovery device is directly sent to the park through the pump after being pressurized. However, the park wastewater treatment plant has high requirements for the COD content in the wastewater, and the wastewater generated by our ethanol recovery far fails to meet the requirements. The price of the park wastewater treatment plant for treating high-concentration COD wastewater is high, which directly increases our production cost and greatly reduces our product market competitiveness. The second is to directly send the wastewater to the waste gas and liquid incinerator for incineration, but since the wastewater contains carbonate, the carbonate particles will adhere to the surface of the catalyst of the waste gas and liquid incinerator after combustion, thereby affecting the normal operation of the waste gas and liquid incinerator. The normal operation of the remaining devices will be affected, and in severe cases, it will directly lead to shutdown and production stoppage, which will cause great economic losses to the company. SUMMARY

[0004] In order to solve the technical problems existing in the prior art, the purpose of the present application is to provide an ethanol recovery wastewater treatment device, which uses simple equipment, has low energy consumption, requires low investment, is energy-saving, efficient, green and environmentally friendly, greatly reduces the wastewater treatment cost, and enhances the product price advantage.

[0005] To solve the above-mentioned technical problems in the prior art, the present application adopts the following technical solutions:

[0006] An ethanol recovery wastewater treatment device, comprising an ethanol product tower and a wastewater treatment plant connected by a wastewater delivery pipe, wherein a tower kettle external delivery pump is arranged on the wastewater delivery pipe, the wastewater in the ethanol product tower is delivered to the wastewater treatment plant by the tower kettle external delivery pump for treatment, and a heat and electricity reference boiler is further arranged, wherein a shunt pipe is arranged between the heat and electricity reference boiler and the wastewater delivery pipe, a heat and electricity boundary valve is arranged on the shunt pipe, a wastewater boundary valve is arranged at the inlet of the wastewater treatment plant, and the wastewater output by the tower kettle external delivery pump is controlled to flow through the heat and electricity boundary valve and the wastewater boundary valve.

[0007] Preferably, the sewage conveying pipe is further provided with a waste water buffer tank and a waste water conveying pump, the waste water in the ethanol product tower is conveyed to the waste water buffer tank by the tower bottom out-pumping to be buffered, and is conveyed to the sewage treatment plant or the heat and electricity co-generation boiler by the waste water conveying pump.

[0008] Preferably, a reflux pipe is further provided between the sewage conveying pipe and the waste water buffer tank, the reflux pipe is provided with a first control valve, and the waste water output by the waste water conveying pump can be refluxed to the waste water buffer tank through the reflux pipe.

[0009] Preferably, a second control valve is provided on the sewage conveying pipe between the reflux pipe and the shunt pipe.

[0010] Preferably, two heat and electricity co-generation area valves are provided in series on the shunt pipe.

[0011] Preferably, a waste water cooler is provided between the waste water buffer tank and the tower bottom out-pumping.

[0012] Preferably, the temperature of the liquid cooled by the waste water cooler is 40-45 degrees.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] The sewage directly flows into the heat and electricity co-generation boiler to be electrolytically heated and burned to be decomposed, the waste water is burned and decomposed by the heat and electricity co-generation boiler, the problem that the carbonate particles in the waste water adhere to the surface of the catalyst of the waste gas and liquid incineration device after combustion, thereby affecting the normal operation of the waste gas and liquid incineration device is effectively solved, the stable operation of the ethanol recovery device is ensured, the equipment used is simple, thus the energy consumption is low, the investment is small, energy saving, high efficiency, green environmental protection, the sewage treatment cost is greatly reduced, and the product price advantage is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model;

[0016] In the drawing: 1, tower bottom out-pumping; 2, sewage conveying pipe; 3, ethanol product tower; 4, waste water cooler; 5, heat and electricity co-generation area valve; 6, shunt pipe; 7, heat and electricity co-generation boiler; 8, sewage treatment plant; 9, sewage area valve; 10, waste water buffer tank; 11, second control valve; 12, first control valve; 13, reflux pipe; 14, waste water conveying pump. DETAILED DESCRIPTION

[0017] The application will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the following described embodiments or technical features can be combined with each other in any manner without conflict to form new embodiments.

[0018] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0019] The terms "first", "second", etc. in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in a "or" relationship.

[0020] As shown in Figure 1 An ethanol recovery wastewater treatment device, comprising an ethanol product column 3 and a sewage treatment plant 8 connected by a sewage delivery pipe 2, wherein an external tank pump 1 is arranged on the sewage delivery pipe 2, the sewage in the ethanol product column 3 is delivered to the sewage treatment plant 8 by the external tank pump 1 for treatment, and a thermal power reference boiler 7 is arranged between the sewage delivery pipe 2 and the sewage treatment plant 8, wherein a shunt pipe 6 is arranged between the thermal power reference boiler 7 and the sewage delivery pipe 2, a thermal power reference area valve 5 is arranged on the shunt pipe 6, a sewage reference area valve 9 is arranged at the inlet of the sewage treatment plant 8, and the wastewater output by the external tank pump 1 is controlled to flow by the thermal power reference area valve 5 and the sewage reference area valve 9.

[0021] Compared with the prior art of directly conveying the wastewater in the ethanol product column 3 to the sewage treatment plant 8 and the waste gas and liquid incinerator, a heat and electricity burning boiler 7 is additionally connected on the prior sewage conveying pipe 2 through a shunt pipe 6 with a heat and electricity zone valve 5, and the pipeline to the waste gas and liquid incinerator is removed. In the process of treating the wastewater discharged from the ethanol product column 3, the wastewater is supplied to the sewage treatment plant 8 and the heat and electricity burning boiler 7 through the column outer sending pump 1 along the sewage conveying pipe 2. When the wastewater can be received by the sewage treatment plant 8, the sewage zone valve 9 is opened and the heat and electricity zone valve 5 is closed, so that the sewage is directly discharged to the sewage treatment plant 8 for treatment. When the sewage treatment plant 8 no longer receives the wastewater, the sewage zone valve 9 is closed and the heat and electricity zone valve 5 is opened, and the heat and electricity burning boiler 7 is started at the same time, so that the sewage directly flows into the heat and electricity burning boiler 7 for electrolytic heating and burning decomposition. The wastewater is burned and decomposed by the heat and electricity burning boiler 7, which effectively solves the problem that the carbonate particles in the wastewater adhere to the surface of the catalyst of the waste gas and liquid incinerator after combustion, thereby affecting the normal operation of the waste gas and liquid incinerator, ensures the stable operation of the ethanol recovery device, and has the advantages of simple equipment, low energy consumption, low investment, energy saving, high efficiency, green environmental protection, greatly reduced sewage treatment cost, and enhanced product price advantage.

[0022] Further improvement is that the sewage conveying pipe 2 is additionally provided with a wastewater buffer tank 10 and a wastewater conveying pump 14. The wastewater in the ethanol product column 3 is conveyed to the wastewater buffer tank 10 by the column outer sending pump 1 for buffering, and is conveyed to the sewage treatment plant 8 or the heat and electricity burning boiler 7 by the wastewater conveying pump 14.

[0023] The wastewater buffer tank 10 and the wastewater conveying pump 14 are added to the sewage conveying pipe 2. The wastewater in the ethanol product column 3 is conveyed to the wastewater buffer tank 10 by the column outer sending pump 1 for buffering, so that when the sewage treatment plant 8 no longer receives the wastewater and the heat and electricity burning boiler 7 needs to be maintained, the wastewater buffer tank 10 can be used as a temporary storage, the heat and electricity burning boiler 7 is prevented from being in a long-term operation state, and the number of the heat and electricity burning boilers 7 does not need to be unnecessarily increased. Meanwhile, the wastewater is sent to the wastewater buffer tank by the column pump, and is sent to the heat and electricity burning boiler 7 for burning by the wastewater buffer tank 10 conveying pump. In this way, the flow of the wastewater is stable, the stable operation of the heat and electricity burning boiler 7 is not affected, and the stable operation of the ethanol recovery device and the waste gas and liquid incinerator is ensured. The wastewater is directly conveyed to the heat and electricity burning boiler 7 for burning by adding one wastewater buffer tank 10 and two pumps and two zone valves, which has the advantages of simple equipment, low energy consumption, low investment, green environmental protection, greatly reduced sewage treatment cost, reduced production cost, and enhanced product price advantage.

[0024] Further improvement is that a backflow pipe 13 is arranged between the sewage conveying pipe 2 and the sewage buffer tank 10, and a first control valve 12 is arranged on the backflow pipe 13, and the sewage output by the sewage conveying pump 14 can flow back to the sewage buffer tank 10 through the backflow pipe 13.

[0025] The backflow pipe 13 with the first control valve 12 is arranged between the sewage conveying pipe 2 and the sewage buffer tank 10, and the sewage output by the sewage conveying pump 14 can flow back to the sewage buffer tank 10 through the backflow pipe 13, so that the sewage in the sewage buffer tank 10 is circulated by the sewage conveying pump 14 and the backflow pipe 13. Since the sewage conveying pump 14 cannot be completely stopped, it is difficult to start after stopping, so when the waste liquid needs to be transported for a short time, the first control valve 12 is opened and the power of the sewage conveying pump 14 is adjusted to the minimum value for sewage circulation treatment, and when it is needed to supply again, the power of the sewage conveying pump 14 is opened, so that the sewage conveying pump 14 can be directly started, effectively solving the problem of difficult starting of the sewage conveying pump 14 after stopping.

[0026] Further improvement is that a second control valve 11 is arranged on the sewage conveying pipe 2 between the backflow pipe 13 and the shunt pipe 6. The second control valve 11 is an external delivery main valve, and after the second control valve 11 is closed, the subsequent common sewage can be cut off.

[0027] Further improvement is that two thermoelectric zone valves 5 are arranged in series on the shunt pipe 6, and when the thermoelectric boiler 7 is in a stopped state, in order to avoid the penetration of sewage into the thermoelectric boiler 7 due to the poor sealing of a single thermoelectric zone valve 5, two thermoelectric zone valves 5 are arranged in series on the shunt pipe 6, and after the double cutting of the two thermoelectric zone valves 5, the problem can be effectively solved.

[0028] Further improvement is that a sewage cooler 4 is arranged between the sewage buffer tank 10 and the tower kettle delivery pump 1, and the temperature of the liquid cooled by the sewage cooler 4 is 40-45 degrees.

[0029] After the temperature of the ethanol recovery sewage is reduced to 40-45 degrees by the sewage cooler 4, the sewage is delivered to the sewage buffer tank for buffering, which can avoid the problem of too high internal liquid temperature of the sewage buffer tank, so that the sewage buffer tank can be safely stored by using a simple container, and the sewage cooler 4 generally uses an inlet and outlet material heat exchanger.

[0030] Taking the natural gas to ethylene glycol production capacity of 600,000 tons / year as an example

[0031] The flow of high-concentration COD wastewater is 0.716 t / h, and the treatment price of the wastewater sent to the sewage treatment plant 8 is 216 yuan / t. The annual sewage treatment cost is 1,237,200 yuan.

[0032] The wastewater is sent to the furnace of the heat and power reference boiler 7 for incineration. The consumption of 0.24 t of coal and 4 KW / h of electricity is required for incinerating 0.716 t of wastewater. The price of coal is 300 yuan / t, and the price of electricity is 0.35 yuan / KW.

[0033] 0.24*300+4*0.35=73.4

[0034] The annual treatment cost is 73.4 yuan*8,000=587,200 yuan. It is more economical to send the wastewater to the furnace for incineration than to send it directly to the sewage treatment plant 8 in the park. The annual cost saving is 1,237,200 yuan-587,200 yuan=650,000 yuan.

[0035] According to the above calculation, it is more economical to send the wastewater to the furnace of the heat and power reference boiler 7 for incineration. In addition, the COD of the wastewater is high, which can avoid disputes caused by sending the wastewater to the sewage treatment plant 8.

[0036] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. An ethanol recovery wastewater treatment apparatus comprising an ethanol product column (3) and a wastewater treatment plant (8) connected by a wastewater transfer pipe (2) provided with a column-bottom feed pump (1), wastewater in the ethanol product column (3) being transferred to the wastewater treatment plant (8) by the column-bottom feed pump (1), characterized in that: Also included is a cogeneration boiler (7) provided with a shunt pipe (6) between the sewage delivery pipe (2), the shunt pipe (6) being provided with a cogeneration area valve (5), the sewage treatment plant (8) being provided with a sewage area valve (9) at the feed inlet end, the wastewater output by the tower kettle delivery pump (1) being controlled to flow through the cogeneration area valve (5) and the sewage area valve (9).

2. An ethanol recovery wastewater treatment apparatus according to claim 1, characterized in that: The sewage delivery pipe (2) is also provided with a wastewater buffer tank (10) and a wastewater delivery pump (14), the wastewater in the ethanol product tower (3) being delivered to the wastewater buffer tank (10) by the tower kettle delivery pump (1) for buffering, and being delivered to the sewage treatment plant (8) or the cogeneration boiler (7) by the wastewater delivery pump (14).

3. An ethanol recovery wastewater treatment apparatus according to claim 2, wherein: The sewage delivery pipe (2) and the wastewater buffer tank (10) are also provided with a backflow pipe (13), the backflow pipe (13) being provided with a first control valve (12), the wastewater output by the wastewater delivery pump (14) being able to flow back to the wastewater buffer tank (10) through the backflow pipe (13).

4. An ethanol recovery wastewater treatment apparatus according to claim 3, wherein: The sewage delivery pipe (2) between the backflow pipe (13) and the shunt pipe (6) is provided with a second control valve (11).

5. The ethanol recovery wastewater treatment apparatus of claim 1, wherein: The shunt pipe (6) is provided with two cogeneration area valves (5) in series.

6. An ethanol recovery wastewater treatment apparatus according to any one of claims 2 to 4, characterised in that: The wastewater buffer tank (10) is provided with a wastewater cooler (4) between the tower kettle delivery pump (1).

7. An ethanol recovery wastewater treatment apparatus according to claim 6, wherein: The temperature of the liquid cooled by the wastewater cooler (4) is 40-45 degrees.

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