CN210505637U - Landfill leachate ammonia still equipment - Google Patents

Abstract

The utility model provides an ammonia still for landfill leachate, which comprises an ammonia still, a water heater, a water tank and a water tank, wherein the ammonia still is configured to heat the landfill leachate by; the second type absorption heat pump is configured to produce high-temperature and high-pressure hot water by utilizing the mixture of the ammonia and the water vapor; the flash tank is configured to enable the high-temperature high-pressure hot water to generate saturated steam, and the saturated steam is introduced into the ammonia still and used for heating the landfill leachate. According to the utility model provides a landfill leachate ammonia still device retrieves the used heat of the mixture of ammonia and vapor through second type absorption heat pump and flash tank in order to produce saturated steam to reuse saturated steam in the ammonia still heating, improved ammonia still efficiency, practiced thrift the energy, improved the generating efficiency and the economic benefits of msw incineration power plant.

Description

Landfill leachate ammonia still equipment

Technical Field

The utility model relates to a filtration liquid field of handling, specifically, the utility model relates to a landfill leachate ammonia still device.

Background

The landfill leachate contains various refractory organic components, ammonia nitrogen and NH₃The concentration of-N is high. In the landfill leachate treatment process, ammonia steam in the landfill leachate can be recovered by adopting an ammonia still to prepare ammonia water for selective non-catalytic reduction (SNCR) denitration of a waste incineration power plant, so that the SNCR denitration cost is saved.

However, in the ammonia still of domestic waste incineration power plants at present, the mode of directly extracting steam from the low-pressure cylinder of the steam turbine to heat the landfill leachate is mostly adopted, so that ammonia steam is released, and the extraction of the steam from the low-pressure cylinder reduces the power generation capacity of the waste incineration power plants, thereby causing a great amount of economic loss.

Therefore, there is a need to provide a new ammonia still for landfill leachate to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

The utility model provides a landfill leachate ammonia still installation, include:

an ammonia still configured to heat the landfill leachate with steam to produce a mixture of ammonia and water vapor;

the second type absorption heat pump is configured to produce high-temperature and high-pressure hot water by utilizing the mixture of the ammonia and the water vapor;

the flash tank is configured to enable the high-temperature high-pressure hot water to generate saturated steam, and the saturated steam is introduced into the ammonia still and used for heating the landfill leachate.

Further, landfill leachate ammonia still includes:

the heat exchanger is configured to realize heat exchange between the landfill leachate with lower temperature entering the ammonia still and the landfill leachate with higher temperature discharged from the ammonia still.

Further, landfill leachate ammonia still includes:

a condenser coupled to the second-type absorption heat pump and configured to cool the mixture of ammonia and water vapor to ammonia.

Further, a water inlet is formed in the side wall of the upper part of the ammonia still and is configured to enable the landfill leachate with lower temperature to enter the ammonia still; and a water outlet is formed in the bottom of the ammonia still and is configured to discharge the landfill leachate with higher temperature from the ammonia still.

Further, a steam inlet is arranged on the side wall of the lower part of the ammonia still and is configured to enable saturated steam generated by the flash tank to enter the ammonia still; the top of the ammonia still is provided with a steam outlet which is configured to discharge the mixture of the ammonia and the water vapor from the ammonia still.

Further, landfill leachate ammonia still includes:

and the ammonia water storage tank is connected with the condenser and is configured to store the ammonia water.

Further, landfill leachate ammonia still includes:

a hot water pump disposed between the second-type absorption heat pump and the flash tank, configured to pump saturated hot water in the flash tank into the second-type absorption heat pump.

According to the utility model provides a landfill leachate ammonia still device retrieves the used heat of the mixture of ammonia and vapor through second type absorption heat pump and flash tank in order to produce saturated steam to reuse saturated steam in the ammonia still heating, improved ammonia still efficiency, practiced thrift the energy, improved the generating efficiency and the economic benefits of msw incineration power plant.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions of the invention, which are used to explain the principles and devices of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a schematic diagram of the ammonia still for landfill leachate of the present invention.

Reference numerals

1. Ammonia still 2, second class absorption heat pump

3. Flash tank 4 and heat exchanger

5. Condenser 6 and ammonia water storage tank

7. Hot water pump

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

In order to thoroughly understand the present invention, detailed steps will be provided in the following description in order to explain a landfill leachate ammonia still device provided by the present invention. It is apparent that the practice of the invention is not limited to the specific details known to those skilled in the art. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

To the problem that directly extract steam turbine low pressure cylinder steam and heat landfill leachate's mode economic benefits is poor among the prior art, the utility model provides a landfill leachate ammonia still device, as shown in figure 1, include:

an ammonia still 1 configured to heat the landfill leachate with steam to generate a mixture of ammonia and water vapor;

the second type absorption heat pump 2 is configured to produce high-temperature and high-pressure hot water by using the mixture of the ammonia and the water vapor;

the flash tank 3 is configured to enable the high-temperature high-pressure hot water to generate saturated steam, and the saturated steam is introduced into the ammonia still 1 and used for heating the landfill leachate.

Illustratively, the working principle of the ammonia still is as follows: the method adopts general heat carrier steam as a superheated carrier, so that the equilibrium steam pressure of ammonia on the liquid level of circulating water is greater than the partial pressure of ammonia in the heat carrier, and the vapor-liquid two phases are in countercurrent contact to carry out mass transfer and heat transfer, so that the ammonia is gradually released from the circulating water, a mixture of the ammonia steam and the steam is obtained at the tower top, and purer circulating water is obtained at the tower bottom. As an example, steam is used as the superheated carrier and landfill leachate is used as the circulating water.

As shown in fig. 1, a water inlet is arranged on the side wall of the upper part of the ammonia still 1, and is configured to allow the landfill leachate to be reacted to enter the ammonia still, and the temperature of the landfill leachate to be reacted is lower; the bottom of the ammonia still 1 is provided with a water outlet, and the water outlet is configured to discharge the reacted landfill leachate from the ammonia still, and the reacted landfill leachate and steam have carried out mass and heat transfer and have higher temperature.

As shown in fig. 1, a steam inlet is arranged on the side wall of the lower part of the ammonia still 1 and is configured to allow steam to enter the ammonia still; the top of the ammonia still 1 is provided with a steam outlet configured to discharge the generated mixture of ammonia and water vapor from the ammonia still.

In one embodiment, steam enters the ammonia still 1 through a steam inlet arranged on the lower side wall of the ammonia still 1, landfill leachate enters the ammonia still 1 through a water inlet arranged on the upper side wall of the ammonia still 1, and the two phases of steam and liquid are in countercurrent contact to perform mass and heat transfer, so that ammonia gas is gradually released from the landfill leachate to generate a mixture of ammonia gas and water vapor.

Further, the utility model provides a landfill leachate ammonia still includes heat exchanger 4, heat exchanger 4 configuration is to utilize the higher landfill leachate heating of ammonia still tower 1 exhaust temperature to be about to get into the lower landfill leachate of temperature in the ammonia still tower 1.

The landfill leachate which is about to enter the ammonia still 1 is heated by utilizing the waste heat of the ammonia still, so that the temperature of the landfill leachate to be reacted is increased, the steam consumption for gradually releasing ammonia from the landfill leachate can be reduced, the ammonia still efficiency is improved, and the production cost is reduced.

For example, the second type absorption heat pump 2 is a device for recycling heat energy of a low-temperature heat source to prepare a required process or a high-temperature heating medium for heating, and realizing heat energy transmission from low temperature to high temperature. It mainly comprises an evaporator, an absorber, a generator, a condenser, a heat exchanger, a pump and other accessories. The second type of absorption heat pump 2 generally uses water as a refrigerant, a lithium bromide solution as an absorbent, low-grade waste heat (hot water, steam or other media) is introduced into an evaporator and a generator, cooling water is introduced into a condenser, and an absorber generates a high-grade heating medium (steam or hot water).

In this embodiment, low grade waste heat (i.e., a mixture of ammonia and water vapor) first enters the evaporator where it releases heat, heats the refrigerant water and produces refrigerant vapor. Refrigerant steam enters the absorber and is absorbed by lithium bromide concentrated solution from the generator, and the heat released in the absorption process heats circulating water in the heat transfer pipe of the absorber to generate high-temperature high-pressure hot water which is conveyed into the flash tank 3. The lithium bromide dilute solution obtained after absorbing the refrigerant steam flows out of the absorber, flows through the solution heat exchanger and then enters the generator, is heated and concentrated by low-grade waste heat (mixture of ammonia and water vapor) in a heat transfer pipe of the generator, and generates the refrigerant steam, the refrigerant steam enters the condenser to release condensation heat, heats cooling water flowing through the heat transfer pipe of the condenser, is condensed into lithium bromide concentrated liquid by the cooling water, and then is sent into the evaporator by the refrigerant pump to be re-evaporated, thereby completing the circulation.

Because second type absorption heat pump can promote the grade of low temperature waste heat effectively, the utility model discloses a second type absorption heat pump technology retrieves the waste heat of the mixture of ammonia and vapor of ammonia tower top steam outlet exhaust to realized the energy saving, reduced production running loss and cost, improved economic benefits.

For example, the principle of a flash tank is that saturated water at high pressure, after entering a relatively low pressure vessel, becomes part of the saturated vapor and water at the vessel pressure due to the sudden drop in pressure.

In this embodiment, the second type absorption heat pump 2 generates high-temperature high-pressure hot water, and the high-temperature high-pressure hot water is delivered to the flash tank 3, and the high-temperature high-pressure hot water is rapidly boiled and vaporized in the flash tank 3, and two phases are separated, so as to generate saturated steam and saturated hot water, wherein the saturated steam is returned to the ammonia still 1 through a steam inlet, and is used for heating landfill leachate to generate ammonia and water vapor, thereby completing the cycle.

Further, a hot water pump 7 is further disposed between the flash tank 3 and the second-type absorption heat pump 2, and is configured to pump saturated hot water generated in the flash tank 3 to the second-type absorption heat pump. Wherein, the heat contained in the saturated hot water can be utilized by the second absorption heat pump 2.

And the waste heat of the mixture of ammonia and water vapor is recovered to generate saturated steam through the second-class absorption heat pump and the flash tank, and the saturated steam is used for heating the ammonia still, so that the steam extraction amount of the low-pressure cylinder of the steam turbine is reduced, and the power generation efficiency and the economic benefit of the waste incineration power plant are improved.

The utility model discloses a landfill leachate ammonia still includes condenser 5 and aqueous ammonia storage tank 6. The condenser 5 is connected with the second-type absorption heat pump 2 and is configured to cool the mixture of the ammonia and the water vapor into ammonia water; and an ammonia water storage tank 6 is connected with the condenser 5 and is configured to store ammonia water.

According to the utility model provides a landfill leachate ammonia still device retrieves the used heat of the mixture of ammonia and vapor through second type absorption heat pump and flash tank in order to produce saturated steam to reuse saturated steam in the ammonia still heating, improved ammonia still efficiency, practiced thrift the energy, improved the generating efficiency and the economic benefits of msw incineration power plant.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The utility model provides a landfill leachate ammonia still device which characterized in that includes:

an ammonia still configured to heat the landfill leachate with steam to produce a mixture of ammonia and water vapor;

the second type absorption heat pump is configured to produce high-temperature and high-pressure hot water by utilizing the mixture of the ammonia and the water vapor;

the flash tank is configured to enable the high-temperature high-pressure hot water to generate saturated steam, and the saturated steam is introduced into the ammonia still and used for heating the landfill leachate.

2. The landfill leachate ammonia still as claimed in claim 1, further comprising:

the heat exchanger is configured to realize heat exchange between the landfill leachate with lower temperature entering the ammonia still and the landfill leachate with higher temperature discharged from the ammonia still.

3. The landfill leachate ammonia still as claimed in claim 1, further comprising:

a condenser coupled to the second-type absorption heat pump and configured to cool the mixture of ammonia and water vapor to ammonia.

4. The landfill leachate ammonia still as claimed in claim 2, wherein the sidewall of the upper part of the ammonia still is provided with a water inlet configured to allow the landfill leachate with lower temperature to enter the ammonia still; and a water outlet is formed in the bottom of the ammonia still and is configured to discharge the landfill leachate with higher temperature from the ammonia still.

5. The landfill leachate ammonia still as claimed in claim 4, wherein a steam inlet is provided on a sidewall of a lower portion of the ammonia still, and configured to allow the saturated steam generated by the flash tank to enter the ammonia still; the top of the ammonia still is provided with a steam outlet which is configured to discharge the mixture of the ammonia and the water vapor from the ammonia still.

6. The landfill leachate ammonia still distillation device of claim 3, further comprising:

and the ammonia water storage tank is connected with the condenser and is configured to store the ammonia water.

7. The landfill leachate ammonia still as claimed in claim 1, further comprising:

a hot water pump disposed between the second-type absorption heat pump and the flash tank, configured to pump saturated hot water in the flash tank into the second-type absorption heat pump.

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