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Open type absorption heat pump sludge drying system and using method

An absorption heat pump, sludge drying technology, applied in heat pump, dewatering/drying/concentrating sludge treatment, refrigeration and liquefaction, etc. question

Inactive Publication Date: 2021-02-23
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the above-mentioned absorption heat pump is used for sludge drying, it adopts a closed structure, and needs to use an evaporator to remove excess moisture in the circulating air, and there are many energy transfer links, which not only increase the heat transfer loss but also increase the complexity of the system. , in addition, the system also needs an additional low-temperature cooling source to remove the excess heat of the air, and there is no cascade utilization of the driving heat, resulting in a reduction in the technical economy of the system

Method used

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  • Open type absorption heat pump sludge drying system and using method
  • Open type absorption heat pump sludge drying system and using method
  • Open type absorption heat pump sludge drying system and using method

Examples

Experimental program
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Effect test

Embodiment 1

[0077] An open absorption heat pump sludge drying system, such as figure 1 Shown is a single-effect structure of an open absorption heat pump sludge drying system, including a condensing device and an open absorber 9, a first drier 5, and a second drier 16, all of which are hollow structures. It also includes a first heat exchanger 13, a third heat exchanger 15, a first air heat exchanger 7 and a second air heat exchanger 18 each having a heating channel and a cooling channel, and the heating channel and the cooling channel are isolated from each other And they are all made of high-efficiency heat exchange materials. The temperature of the liquid or gas flowing through each heating channel is lowered, and the temperature of the liquid or gas flowing through each cooling channel is increased, thereby realizing the cooling of the liquid or gas in the heating channel. The purpose of the liquid or gas in the channel exchanging heat with each other; to simplify the description, all...

Embodiment 2

[0110] An open absorption heat pump sludge drying system, such as figure 2 Shown is a double-effect structure of an open absorption heat pump sludge drying system, and the following changes are made on the basis of Example 1:

[0111] 1. The condensing device increases the second generator 2 and the second heat exchanger 12 on the basis of embodiment 1, and becomes a double-effect evaporation structure;

[0112] 2. Remove the connection between the steam outlet 102 of the first generator and the steam inlet 302 of the condenser;

[0113] 3. On the wall of the condenser 3, a condenser condensate inlet 304 communicating with the inner cavity of the condenser 3 is added;

[0114] 4. The solution circulation pipeline a is correspondingly adjusted to the solution circulation pipeline c.

[0115] details as follows:

[0116] The condensing device also includes a hollow second generator 2 with a sealed structure. The inside of the second generator 2 is provided with a hollow and ...

Embodiment 1

[0143]The design conditions of implementation example 1 are: the initial water content of sludge is 40%, the water content after dehydration is 15%, the average dehydration temperature is 30°C, the working temperature of the absorber is 70°C, the air-to-solid ratio is 36.1:1, and the dry hot air temperature is 55 ℃, the moisture content is 0.0167kg / kg. The calculation parameters of implementation example 1 are shown in Table 1 (for 1kg sludge). Compared with implementation example 2, implementation example 1 adopts a single-effect structure, although the water production ratio (i.e. heat utilization efficiency, defined as the ratio of dehydration evaporation latent heat to heat consumption) ratio) is reduced from 2.13 in Example 2 to 1.45, but its benefit is that compared with Example 2, one generator is reduced, the system is simplified, and the heat source temperature requirement is reduced from 228°C to 140.7°C, and the adaptability to the heat source is better Strong, comp...

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Abstract

The invention discloses an open-type absorption heat pump sludge drying system and a using method thereof, the system comprises a generation condensation device, and an open-type absorber, a first dryer and a second dryer which are all of a hollow structure; the system also comprises a first heat exchanger, a third heat exchanger, a first air heat exchanger and a second air heat exchanger which are respectively provided with a heating channel and a cooling channel which are mutually isolated; and the structure is divided into a single-effect structure and a double-effect structure. When the method is adopted for drying, circulating air, an evaporator and a low-temperature cold source are not needed.

Description

technical field [0001] The invention relates to the technical field of sludge drying, in particular to an open absorption heat pump sludge drying system and a use method. Background technique [0002] With the development of society and economy, the amount of urban sewage is increasing year by year, and the sewage treatment volume of sewage enterprises above the county level in the country is close to 200 million m 3 / d, about 160,000 tons of sludge with a moisture content of 80% is produced every day. In order to carry out subsequent harmless and resourceful treatment, the sludge must be deeply dehydrated to the range of 10%-40%, which is called sludge Heat dry. It is classified according to whether the process is actively invested in energy, and there is a difference between active thermal drying and passive thermal drying. The former is widely used because of its fast drying speed, small footprint and stable operation. Active thermal drying is driven by electric energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/13F25B30/04F25B41/40F25B39/04
CPCC02F11/13F25B30/04F25B39/04
Inventor 王厉骆菁菁
Owner ZHEJIANG SCI-TECH UNIV
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