Method of low-temperature heat utilisation

FIELD: heating.

SUBSTANCE: invention is aimed at using effluent water heat and can be applied in heating engineering. The method implies using effluent water being purified in the aerotank, resting or moving with the speed close to zero as a heat transfer medium. The remote heat exchanging unit which is placed in the airlift immersed within the effluent water at the total depth of the aerotank is surrounded by a zone of intensive air-water mixture production with the help of, for example, plastic enclosure shields; velocity of the mixture upward flow is regulated by a gate valve mounted at the heat insulated pipe for supplying compressed air to the airlift.

EFFECT: simplicity and efficiency of effluent water heat utilisation.

2 dwg

 

The invention relates to a power system, in particular for heating and hot water supply of small production facilities, private residential buildings, individual buildings using low-grade natural heat sources, domestic sewage and other waste heat.

It is known that contained in the wastewater of low-potential heat, until recently, as a rule, were not utilized. Meanwhile, there is a continuing need in water heated to a temperature of about 50 to 70°that it is possible to provide a heat pump to effectively transform low-grade heat up to higher temperatures. However, their direct interaction with untreated waste water is unacceptable that requires the use of intermediate heat exchangers, for example, external heat-exchanger modules, in which the heated medium is pure water circulating in the evaporator of the heat pump. Another specific feature utilization of low-grade heat in the wastewater is specific (actual) condition, in which the coolant in the value of its temperature, and the speed of its movement, if it is not at all at rest, inherent in, for example, clarifiers, aeration and other similar wastewater treatment plants, also with considerable, but as yet unclaimed reserves of low-grade heat.

A known method of disposal of low-grade heat (patent RF №2155302, IPC F24D 17/02) using a heat pump with an external heat exchanger associated with the evaporator of the heat pump intermediate circulation loop, as well as the heating system. At the same time as a heat source of low potential is receiving well wastewater municipal sewer network, which together with the heat exchanger vibrator, designed to break down the layer of dirt deposited on the working surfaces of the heat exchanger. Obviously, in this case, the transfer of heat from waste water to the water circulating in the evaporator of the heat pump, is under very favorable conditions, as within hours after the wells are hundreds of cubic meters warm enough domestic wastewater, moving with considerable speed.

There is also known a method of disposal of low-potential heat of the waste water (see description to the patent of Russian Federation №2186309 IPC F28D 1/047), we adopted for the prototype, using a heat pump, equipped with a remote heat exchanger module, actively interacting with open thin-layer flow speed, in which the water temperature is about 18-20� With time consumption is also measured in hundreds of cubic meters, which is typical, for example, rake branches of urban sewage pumping stations.

For reasons that impede the achievement of specified following technical result when using the known above methods, is the fact that they cannot effectively utilize the heat domestic wastewater, residing in the state of rest or motion with a speed close to zero, especially in the winter when the water temperature in the tank does not exceed 8-12°C, i.e. in the absence of the necessary conditions for the transfer of heat to water circulating inside the heat exchanger module and sent after heating in the heat pump evaporator. It is known that the speed of movement of the carrier is one of the main factors determining along with temperature and pressure efficiency of the heat transfer process.

The present invention is to create a simple, effective method of heat recovery domestic wastewater, residing in the state of rest or motion with a speed close to zero, due to changes in external conditions in the contact zone of the external heat exchanger module with the specified waters.

The technical result - heat utilization of large volumes of relatively cool waste water, oblad is affected by significant reserves of low-grade heat, that will allow to refuse from the boiler and, as a consequence, to reduce the emissions of harmful flue gases, worsening the environmental situation in the settlements.

To solve this problem, the proposed method of disposal of low-grade heat domestic wastewater using heat pump and external heat-exchange module according to the invention as the coolant using the waste water undergoing treatment in the aeration tank and remaining at rest or moving with a speed close to zero, in this case around the external heat exchanger module, placed in the airlift, immersed in the waste water at the depth of the aeration tank, creating a zone of intensive formation of air-water mixture, for example, by using plastic panels fencing, the speed of the upward flow which regulate the valve in an insulated pipe of the compressed air in the airlift.

The stated set of essential features creates favorable conditions for efficient transfer of heat to water circulating inside the heat exchanger module and sent after heating in the heat pump evaporator.

Regulation of the speed of the upward flow of air-water mixture allows you to affect the efficiency of the heat transfer process by changing races is an ode to the compressed air valve.

Thus, due to changes in external conditions in the contact zone of the external heat exchanger module with domestic wastewater at rest or moving with a speed close to zero, that is, for example, in the settling tanks, aeration tanks or other treatment facilities, reserves of low-grade heat can be claimed with a simultaneous decrease in load on the environment by eliminating boiler.

In the patent and scientific literature is not well-known technical solutions containing elements similar to declare, therefore, the proposal meets the criterion of "novelty". Also for the first time, on the basis of the developed method achieved an effective heat transfer from the fluid residing in the state of rest or motion with a speed close to zero, due to changes in external conditions in the contact zone of the heat exchange module with domestic wastewater undergoing treatment in settling tanks, aeration tanks or other wastewater treatment plants, i.e. the claimed technical solution meets the criterion of "inventive step".

Figure 1 is a flow diagram of the claimed method; figure 2 shows a top view of the airlift holds heat exchanger module and the boards of the fence.

Technological scheme includes Winona the heat exchange module 1, involved in the evaporator of the heat pump (not shown), the air pump 2, the aeration tank 3, the plastic panels 4, 5 and 6, the valve 7, the heat-insulated pipe 8. The aeration tank is a horizontal sump depth of 2.5-3 m, filled with domestic wastewater, subject to biological treatment using aerobic microorganisms. The capacity of the aeration tank is measured in thousands of cubic meters.

The method is as follows.

In the air pump 2, is immersed in the waste water tank 3, which is at rest or moving with a speed close to zero, blower (figure 1 it is not shown) serves compressed air.

Resulting in around external heat exchanger module 1 used in the evaporator of the heat pump inside the air pump 2, a walled plastic panels 4, 5 and 6, creates a zone of intensive formation of air-water mixture. Air-water mixture (emulsion), being less dense than the surrounding air-lift water tank, is driven according to the law of communicating vessels, in which, as is well known, and is the principle of the airlift. The speed of the upward flow of air-water mixture regulating valve 7 installed on insulated pipe 8 submission to the airlift of compressed air.

Supplied by the blower JUA the initial air may have a temperature of about 50° With that in combination with the movement of the air-water mixture along the working surface of the external heat exchanger module creates favorable conditions for a more efficient transfer of heat to water circulating inside the external heat exchanger module and sent after heating for 3-5°in the evaporator of the heat pump.

Although the active flow of the heat exchange module air-to-water mixture and creates some prerequisites to counter subsidence contained in the purified water pollution on the working surface of the module, periodically it should be maintenance - lifting and handling clean water from a pressure hose.

Due to the fact that treatment facilities, particularly those that are designed for biological treatment of domestic wastewater is usually enough removed from urban settlements, providing heat and hot water for their industrial premises is not centralized (from urban heating), and from individual boilers that use as fuel, usually coal, the burning of which has a negative impact on the environment. Therefore, the use of low grade heat wastewater not only provide a certain saving of coal by reducing the performance of the boiler (up to its conservation n the spring-summer period), but will significantly reduce the emission of harmful flue gases.

Thus, it becomes possible heat recovery of large volumes of wastewater at rest or with movement speed is close to zero, and has significant reserves of low-grade heat.

For implementing the inventive method does not require the development and production of sophisticated equipment as the main element of the General technological scheme of waste heat (heat pump) for many years produced serially.

Thus, the reserves of low-grade heat from wastewater at rest or moving with a speed close to zero, become demanded.

The method of disposal of low-grade heat domestic wastewater using heat pump and external heat exchanger module, characterized in that as the coolant using the waste water undergoing treatment in the aeration tank and abiding in the state of rest or motion with velocities close to zero, in this case around the external heat exchanger module, placed in the airlift, immersed in the waste water at the depth of the aeration tank, creating a zone of intensive formation of air-water mixture, for example, by using plastic panels fencing, the speed of the upward flow which regulate sadwick the th, installed on insulated piping compressed air in the air pump.



 

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Method heat // 2084768
The invention relates to the field of energy and can be used to heat

FIELD: chemistry, technological processes.

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2 tbl, 1 ex

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FIELD: chemistry, technological processes.

SUBSTANCE: method includes sorption and oxidation of sewage water in biocoenosis of active silt, in combination with process of sorption and oxidation by means of biological film with degree of oxygen air saturation not less than 18-22 mg/l. Process is carried out after cavitational processing with cavitation number G=0.004 at the stage of preliminary purification successively in three stages, which take place in autonomous reactors, which differ from each other by used biocoenosis of active silt and biological film. Mixing of active silt with purified sewage water is carried out in each reactor not less than twice in ascending-descending flow, formed in reactor by turbulization of supplied to lower part of reactor water-air mixture, processed at each stage by cavitation with number G=0.002 and aeration. Retained sediment is divided into parts, each of which is supplied to one of reactors, where water purification took place, one - for silt regeneration, the remaining - for processing of utilized sediment, where it is processed in alternating manner in turns by cavitation with numbers G=0.001 and 6.5, number of cycles being not less than two. Supply of sewage water into each of reactors, used for regeneration of swollen silt or sediment processing, is stopped for the time required for said processes, during which in circulation process repeated aerational and cavitational processing are carried out, after which silt is compacted by settling process, and supernatant water, which was enriched with ferments in process of sediment processing, is supplied to initial stage of water purification process.

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2 tbl, 1 ex

FIELD: heating.

SUBSTANCE: invention is aimed at using effluent water heat and can be applied in heating engineering. The method implies using effluent water being purified in the aerotank, resting or moving with the speed close to zero as a heat transfer medium. The remote heat exchanging unit which is placed in the airlift immersed within the effluent water at the total depth of the aerotank is surrounded by a zone of intensive air-water mixture production with the help of, for example, plastic enclosure shields; velocity of the mixture upward flow is regulated by a gate valve mounted at the heat insulated pipe for supplying compressed air to the airlift.

EFFECT: simplicity and efficiency of effluent water heat utilisation.

2 dwg

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