CN216236130U

CN216236130U - Equipment for realizing low-cost zero discharge of wastewater based on waste heat utilization

Info

Publication number: CN216236130U
Application number: CN202122778223.9U
Authority: CN
Inventors: 马皓生; 李文绪; 韩秀台; 王占锋; 袁明君; 陈丽
Original assignee: Henan Starlight Mechanical Co ltd
Current assignee: Henan Starlight Mechanical Co ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-04-08
Anticipated expiration: 2031-11-10

Abstract

The utility model discloses a device for realizing low-cost zero discharge of wastewater based on waste heat utilization, which comprises an air compressor, an oil cooler, a crystallization tank, an evaporation water tank, an evaporator, a circulating fan, a condenser, a water removal tank, a condensate water storage tank and a control system, wherein the air compressor and the oil cooler form oil circulation, the oil cooler, the crystallization tank, the evaporation water tank and the evaporator form hot water circulation, the evaporator, the circulating fan, the condenser, the water removal tank and the condensate water storage tank form hot steam circulation, the evaporation water tank is filled with wastewater, and high-temperature circulating oil in the air compressor is introduced into the oil cooler and exchanges heat with the wastewater in the evaporation water tank. The low-cost wastewater zero-discharge equipment based on waste heat utilization realizes the zero discharge of small-flow wastewater on the premise of not influencing the normal work of the original air compressor, the evaporation cost reaches the level of a large MVR evaporator, the problem that the evaporation cost of the small-flow wastewater is high is solved, and the low-cost wastewater zero-discharge equipment has better popularization and application values.

Description

Equipment for realizing low-cost zero discharge of wastewater based on waste heat utilization

Technical Field

The utility model relates to the technical field of wastewater treatment, in particular to a device for realizing low-cost wastewater zero discharge based on waste heat utilization.

Background

The common wastewater evaporation method is to evaporate wastewater by using a triple-effect evaporator and an MVR evaporator, but the triple-effect evaporator and the MVR evaporator are mainly used for evaporation of a large amount of wastewater and have cost performance advantage, mainly because the equipment is complex and has high cost, the operation cost is low when the wastewater amount is large, the triple-effect evaporator can reach 60-70 yuan/ton by introduction of information, and the MVR evaporator can be reduced to 30-40 yuan/ton. However, if the evaporation capacity is too small (less than 0.5 ton/hr) the triple effect evaporator can reach about 120 yuan/ton, the MVR evaporator can also reach 80 yuan/ton of operating cost. The method is not suitable for the condition of small annual wastewater evaporation amount, and cannot bear the running cost of directly heating and evaporating the wastewater to 500 yuan/ton.

The working principle of an air compressor is researched, and the working principle of the air compressor is as follows: the motor drives the screw compressor to run, the air is sucked into the screw compressor after being filtered by the filter, is compressed into high-pressure air, is mixed with circulating oil to form high-pressure high-temperature oil-gas mixed gas, then enters the oil-gas separator, the oil-gas mixed gas is separated into oil and gas, and the compressed air is cooled and dried and then is supplied to a user; and after the circulating oil gas is separated, cooled and condensed into liquid oil, the liquid oil returns to the compressor after heat dissipation, cooling and filtration, and a circulation process is completed. Except that about 15% of input power of the air compressor is changed into potential energy of compressed air, about 85% of other energy is discharged into the air in the form of waste heat to be wasted. The available energy (waste heat) is about 80% of the input power of the air compressor. Considering that the air compressor has large waste heat quantity and high utilization value, the combination of the open type transverse flow cooling device has high technical maturity and good water evaporation effect, and the combination of the air compressor and the open type transverse flow cooling device is a good scheme for evaporating waste water by using waste heat, so that the process flow for evaporating waste water by using the waste heat of the air compressor is researched and a device for realizing low-cost zero emission of waste water based on waste heat utilization is provided.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide equipment for realizing low-cost zero discharge of wastewater based on waste heat utilization, which can effectively solve the problems in the background technology.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a waste heat utilization-based low-cost waste water zero-discharge device comprises an air compressor, an oil cooler, a crystallization tank, an evaporation water tank, an evaporator, a circulating fan, a condenser, a water removal tank, a condensate water storage tank and a control system, wherein the air compressor and the oil cooler form an oil circulation, the oil cooler, the crystallization tank, the evaporation water tank and the evaporator form a hot water circulation, the evaporator, the circulating fan, the condenser, the water removal tank and the condensate water storage tank form a hot steam circulation, waste water is filled in the evaporation water tank, high-temperature circulating oil in the air compressor is introduced into the oil cooler and exchanges heat with the waste water in the evaporation water tank, the high-temperature circulating oil returns to the air compressor after being cooled to finish the oil circulation, the waste water is heated into high-temperature hot water through energy exchange, then the waste water enters the evaporator, one part of the hot water is evaporated into hot steam in the evaporator, the other part of the hot water exchanges energy in the evaporation process, the cooling is low temperature hot water, returns to the evaporation pond, gets into hot water circulation next time, circulating fan inhales hot vapour into the condenser, and hot vapour accomplishes the heat exchange with the condenser internal cooling water, and high temperature hot vapour is cooled down and is condensed into the comdenstion water, and the moisture of not thorough condensation gets into and accomplishes further condensation in removing the water pitcher, gets into the evaporimeter again as fresh gas after accomplishing through circulating fan pressurization once more, gets into hot vapour circulation next time.

Preferably, the crystallization tank is used for collecting the too high waste water of concentration in the evaporation water pond, avoids in the waste water salting out and blocks up the interior tubule of oil cooler.

Preferably, the evaporation water tank is provided with liquid level control and automatic water replenishing.

Preferably, the condensed water storage tank is used for collecting the condensed water completely condensed in the hot steam cycle, so that the subsequent utilization of the condensed water is facilitated.

Preferably, an oil circulation pipeline is arranged between the air compressor and the oil cooler.

Preferably, a hot water circulating pipeline is arranged between the oil cooler, the evaporator and the evaporation water tank, a first valve and a circulating pump are arranged between the oil cooler and the evaporation water tank, and a second valve is arranged between the crystallization tank and the hot water circulating pipeline.

Preferably, a hot steam circulating pipeline is arranged among the evaporator, the circulating fan, the dewatering tank and the condenser, and a cooling tower and a cooling water circulating pipeline are arranged at the condenser.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model realizes the low-cost wastewater zero-discharge equipment based on waste heat utilization to realize 600 tons/year electroplating wastewater evaporation, the annual operating cost is about 2 ten thousand yuan, the wastewater evaporation operating cost is about 34 yuan/ton, and the operating cost level of a large MVR evaporator is reached;

2. the low-cost wastewater zero-discharge equipment realizes the zero discharge of the small-flow wastewater based on the waste heat utilization, the evaporation cost reaches the level of a large MVR evaporator, the problem that the evaporation cost of the small-flow wastewater is high is solved, and the low-cost wastewater zero-discharge equipment has good popularization and application values;

3. the utility model realizes whether the low-cost wastewater zero-discharge equipment is used or not based on waste heat utilization, the normal work of the air compressor is not influenced when the use effect is good, the original design heat dissipation equipment of the air compressor is started and cooled in time when the device is not started or the cold effect of the device is not good, and the use safety of the air compressor is ensured.

Drawings

FIG. 1 is a frame diagram of the overall structure of the device for realizing zero discharge of low-cost wastewater based on waste heat utilization according to the present invention;

FIG. 2 is a schematic diagram of an oil cycle of a device for realizing zero emission of low-cost wastewater based on waste heat utilization according to the present invention;

FIG. 3 is a schematic diagram of a hot water cycle of the present invention based on waste heat utilization to achieve zero waste water discharge at low cost;

FIG. 4 is a schematic diagram of a hot steam cycle of the low-cost wastewater zero-discharge device based on waste heat utilization according to the present invention.

In the figure: 1. an air compressor; 2. an oil cooler; 3. a crystallization tank; 4. evaporating the water tank; 5. an evaporator; 6. a circulating fan; 7. a condenser; 8. a water removal tank; 9. a condensed water storage tank; 21. an oil circulation pipe; 31. a hot water circulation pipe; 32. a circulation pump; 33. a first valve; 34. a second valve; 41. a hot steam circulation line; 42. a cooling water circulation pipeline.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-4, a device for realizing zero discharge of low-cost waste water based on waste heat utilization comprises an air compressor 1, an oil cooler 2, a crystallization tank 3, an evaporation water tank 4, an evaporator 5, a circulating fan 6, a condenser 7, a water removal tank 8, a condensate water storage tank 9 and a control system, wherein the air compressor 1 and the oil cooler 2 form an oil circulation, the oil cooler 2, the crystallization tank 3, the evaporation water tank 4 and the evaporator 5 form a hot water circulation, the evaporator 5, the circulating fan 6, the condenser 7, the water removal tank 8 and the condensate water storage tank 9 form a hot steam circulation, the evaporation water tank 4 is filled with waste water, high-temperature circulating oil in the air compressor 1 is introduced into the oil cooler 2 and exchanges heat with the waste water in the evaporation water tank 4, the high-temperature circulating oil is cooled and then returns to the air compressor 1 to complete the oil circulation, the waste water is heated into high-temperature hot water through exchange energy and then enters the evaporator 5, a part of the hot water in the evaporator 5 is evaporated into hot steam, and entering hot steam circulation, exchanging energy of the other part of hot water in the evaporation process, cooling the hot water into low-temperature hot water, returning the hot water to the evaporation water tank 4, entering next hot water circulation, sucking the hot steam into the condenser 7 by the circulating fan 6, finishing heat exchange between the hot steam and cooling water in the condenser 7, cooling the high-temperature hot steam and condensing the hot steam into condensate water, enabling moisture which is not completely condensed to enter the water removal tank 8 to finish further condensation, pressurizing the moisture by the circulating fan 6 again, and then re-entering the evaporator 5 as fresh gas to enter next hot steam circulation.

The crystallizing pond 3 is used for collecting waste water with too high concentration in the evaporation water pond 4, and prevents the salt precipitation in the waste water from blocking the thin tubes in the oil cooler 2, the automatic water replenishing of the water level control of the evaporation water pond 4 and the pumping of the waste water after the waste water is evaporated to the preset concentration into the crystallizing pond 3 through the circulating pump 32, the setting of the crystallizing pond 3 mainly prevents the waste water from having too high concentration, and the salt precipitation of the waste water in the hot water circulating pipeline 31 leads to blocking, especially the thin tubes in the oil cooler 2.

The evaporation water tank 4 is provided with liquid level control and automatic water replenishing.

The condensed water storage tank 9 is used for collecting the condensed water completely condensed in the hot steam circulation, so that the subsequent utilization of the condensed water is facilitated.

An oil circulation pipeline 21 is arranged between the air compressor 1 and the oil cooler 2.

Be provided with hot water circulating line 31 between oil cooler 2, evaporimeter 5 and the evaporation pond 4, be provided with first valve 33 and circulating pump 32 between oil cooler 2 and the evaporation pond 4, be provided with second valve 34 between crystallizer 3 and the hot water circulating line 31, first valve 33 is closed, second valve 34 is opened, and the rethread circulating pump 32 is with the leading-in crystallizer 3 of high concentration waste water, and in the hot water circulation process, first valve 33 is opened, second valve 34 is closed.

A hot steam circulating pipeline 41 is arranged among the evaporator 5, the circulating fan 6, the dewatering tank 8 and the condenser 7, a cooling tower and a cooling water circulating pipeline 42 are arranged at the condenser 7, and the condenser 7 realizes the circulation of cooling water through the cooling tower.

The control system in the device takes a PLC programmable controller as a core, realizes full-automatic control, and achieves the purposes of automatic operation, automatic water supplement and the like; the states of oil temperature, cold water and hot water temperature, water level and the like of an inlet and an outlet of the oil cooler 2 are displayed through an HMI (human machine interface), the operation and control of the device cannot interfere with the operation of the air compressor 1, the engine oil temperature of the air compressor 1 is required to be controlled to be 75-95 ℃, the temperature of waste water after heat exchange is controlled to be 60-75 ℃, and the control precision is +/-5 ℃; the circulating water pump 32 used in the device is driven by a variable frequency motor, the flow of the pump is adjustable, and the control of the flow of the water pump is realized by controlling the output frequency of a frequency converter according to the requirement of the system on the temperature of a hot water outlet of an oil cooler of an air compressor; the circulating fan 6 in the device preferably uses a variable frequency speed regulating motor, the rotating speed and the air quantity of the fan are controlled by a frequency converter, the air quantity is convenient to adjust, and the optimal air quantity is determined in the debugging process

The economy of waste water evaporation by using the device is researched:

(1) accounting total energy required by electroplating wastewater evaporation

The electroplating wastewater is normally heated electrically to evaporate, and electric energy is consumed in two aspects, namely, the energy consumed when the wastewater is heated to the evaporation temperature is needed, the energy consumed when the wastewater overcomes the evaporation potential energy is needed, and 1000 kilograms of energy (70-20 ℃) is needed for heating 1 ton of wastewater from 20 ℃ to 70 ℃, 1 kilocalorie/kilogram-DEG C is 50000 kilocalories. The energy required for vaporizing 1 ton of waste water into steam at 70 ℃ is calculated to be 1000 kg.557 kcal/kg-557000 kcal, the energy required for vaporizing 1 ton of waste water is 50000 kcal +557000 kcal-607000 kcal, and the energy converted into electric energy is 706 kw.h. The total electric energy required for evaporating 600 tons of wastewater is 423488 kW.h.

(2) Air compressor residual heat total energy accounting

Except that about 15% of input power of the air compressor is changed into potential energy of compressed air, about 85% of other energy is discharged into the air in the form of waste heat to be wasted. The energy that can be utilized is about 80% of the input power of the air compressor. If a 110KW air compressor is used for waste water evaporation, the available energy power is about 88KW, which provides an available energy of 88KW 24h 250 h 528000KW · h each year. The energy required by evaporation of 600 tons of wastewater is 423488 kW.h, the waste heat energy provided by the air compressor meets the requirement of wastewater evaporation, and the energy matching is feasible.

(3) Economic analysis of waste water evaporated by waste heat of air compressor

A110 KW air compressor can provide 88 KW.h of waste heat per hour, and 706 kW.h of electric energy is needed for evaporating 1 ton of waste water. The waste water amount evaporated by the residual heat of the air compressor per hour is 88/706-0.12 ton. The time for evaporating 1 ton of waste water is about 8.5 hours, and the time for evaporating 600 ton of waste water equipment to run is 600/0.12-5000 hours. The running energy consumption of the waste water evaporation equipment is mainly 4KW of fan power, 0.75KW of a circulating pump, and the total running power of the equipment is 5.0KW in addition to electric control energy consumption. The evaporation energy consumption of each ton of waste water is 5.0KW 8.5 h-42.5 KW.h, and the electric charge is 0.8 yuan 42.5 yuan 34 yuan. The electricity cost for evaporating 600 tons of waste water is about 20000 yuan.

According to the evaporation equipment developed by utilizing the waste heat of the air compressor, preliminary estimation is carried out, and the equipment manufacturing cost budget is 50 ten thousand yuan. At present, the three-effect evaporator and the MVR evaporator have no equipment with the specification less than 0.5 ton/hour, the price is inquired according to the equipment specification of the evaporation capacity of 0.5 ton/hour, and the statistics of the energy consumption condition of the small-specification evaporator are consulted as shown in the following table.

Energy consumption meter for waste water evaporation equipment

(4) Research and development feasibility conclusion of waste heat evaporation waste water equipment of air compressor

Pure electric heat pipe heating waste water evaporation equipment expense is low but the too high enterprise of working costs can not bear, and this device utilizes air compressor machine waste heat evaporation waste water equipment to compare regardless of equipment price or working costs all has obvious advantage with triple effect evaporimeter and MVR evaporimeter evaporation equipment, and about 18 months just can realize the cost recovery, and equipment working costs also obviously has the advantage, and air compressor machine waste heat evaporation waste water equipment research and development economy is feasible.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a realize low-cost waste water zero release equipment based on waste heat utilization, includes air compressor machine (1), oil cooler (2), crystallization tank (3), evaporation water pond (4), evaporimeter (5), circulating fan (6), condenser (7), removes water pitcher (8), comdenstion water storage tank (9) and control system, its characterized in that: the oil circulation is formed by the air compressor (1) and the oil cooler (2), the hot water circulation is formed by the oil cooler (2), the crystallizing pond (3), the evaporation water pond (4) and the evaporator (5), the hot steam circulation is formed by the evaporator (5), the circulating fan (6), the condenser (7), the water removing tank (8) and the condensed water storage tank (9), the evaporation water pond (4) is filled with waste water, high-temperature circulating oil in the air compressor (1) is introduced into the oil cooler (2) and exchanges heat with the waste water in the evaporation water pond (4), the high-temperature circulating oil is cooled and then returns to the air compressor (1) to complete the oil circulation, the waste water is heated into high-temperature hot water through energy exchange, then the waste water enters the evaporator (5), one part of the hot water is evaporated into hot steam in the evaporator (5) and then enters the hot steam circulation, the other part of the hot water exchanges energy in the evaporation process and is cooled into low-temperature hot water, and returning to the evaporation water tank (4), entering next hot water circulation, sucking hot steam into the condenser (7) by the circulating fan (6), finishing heat exchange between the hot steam and cooling water in the condenser (7), cooling and condensing the high-temperature hot steam into condensed water, finishing further condensation by enabling moisture which is not completely condensed to enter the dewatering tank (8), and re-entering the evaporator (5) as fresh gas after being pressurized by the circulating fan (6) again to enter next hot steam circulation.

2. The device for realizing zero discharge of low-cost wastewater based on waste heat utilization according to claim 1, characterized in that: the crystallizing pond (3) is used for collecting the waste water with overhigh concentration in the evaporating water pond (4) and avoiding the salt separation in the waste water from blocking the thin pipes in the oil cooler (2).

3. The device for realizing zero discharge of low-cost wastewater based on waste heat utilization according to claim 2, characterized in that: the evaporation water tank (4) is provided with liquid level control and automatic water replenishing.

4. The device for realizing zero discharge of low-cost wastewater based on waste heat utilization according to claim 3, characterized in that: the condensed water storage tank (9) is used for collecting the condensed water which is completely condensed in the hot steam circulation, so that the subsequent condensed water can be conveniently utilized.

5. The device for realizing zero discharge of low-cost wastewater based on waste heat utilization according to claim 4, characterized in that: an oil circulating pipeline (21) is arranged between the air compressor (1) and the oil cooler (2).

6. The device for realizing zero discharge of low-cost wastewater based on waste heat utilization according to claim 5, characterized in that: be provided with hot-water circulation pipeline (31) between oil cooler (2), evaporimeter (5) and evaporation water pond (4), be provided with first valve (33) and circulating pump (32) between oil cooler (2) and evaporation water pond (4), be provided with second valve (34) between crystallizer (3) and hot-water circulation pipeline (31).

7. The device for realizing zero discharge of low-cost wastewater based on waste heat utilization according to claim 6, characterized in that: a hot steam circulating pipeline (41) is arranged between the evaporator (5), the circulating fan (6), the dewatering tank (8) and the condenser (7), and a cooling tower and a cooling water circulating pipeline (42) are arranged at the condenser (7).