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Anti-explosion low-energy-consumption type low-temperature sludge drying granulation process

A technology of sludge drying and low energy consumption, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of low heat and moisture exchange efficiency, reduced energy efficiency of system operation, and low moisture content of dried sludge, achieving Improve heat and moisture exchange efficiency, strengthen heat and moisture transfer, and improve the effect of heat and moisture exchange efficiency

Pending Publication Date: 2022-01-28
南京韩测环境科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main disadvantages of low-temperature sludge drying units currently on the market are: 1. Poor operation stability and high equipment failure rate, mainly due to compressor damage and heat exchanger leakage
2. Energy efficiency needs to be improved, mainly because the heat and moisture exchange efficiency between the dry hot air of the dehumidification heat pump and the sludge is not high
[0014] Based on this, if the moisture content of the dried sludge is required to be lower, the operating temperature of the dehumidification heat pump is required to be higher. As the operating temperature of the dehumidification heat pump increases, the energy efficiency of the system operation will decrease, and at the same time, the failure rate of the equipment will increase.

Method used

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  • Anti-explosion low-energy-consumption type low-temperature sludge drying granulation process
  • Anti-explosion low-energy-consumption type low-temperature sludge drying granulation process
  • Anti-explosion low-energy-consumption type low-temperature sludge drying granulation process

Examples

Experimental program
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Effect test

Embodiment 1

[0044] An explosion-proof low-energy low-temperature sludge drying and granulation process is composed of a hot air circulation drying system and a bipolar heat pump dehumidification system.

[0045] Among them, the hot air circulation drying system includes a sludge conveying feeder, a granulator, a sludge particle conveyor belt, a stirring fan, an activated carbon air filter, and a dry sludge particle discharger;

[0046] The bipolar heat pump dehumidification system includes a high temperature side heat pump dehumidification system and a low temperature side heat pump dehumidification system;

[0047] The high temperature side heat pump dehumidification system is composed of a high temperature side compressor, a high temperature side plate water-cooled condenser, a high temperature side evaporator, a high temperature side expansion valve, a high temperature side heating heat exchanger, and a high temperature side hot water circulating pump;

[0048] The low-temperature side...

Embodiment 2

[0050] The bipolar heat pump dehumidification system also includes a heat recovery system, which is composed of a heat recovery device and a heat recovery circulating water pump, which is used for precooling of hot humid air and preheating of low temperature saturated air.

Embodiment 3

[0052] Based on embodiment 1,2, further, each equipment parameter in the technique is carried out optimized design, as follows:

[0053] The granulator granulates into hollow granules, and the shape of the granules is selected from but not limited to hollow cylinder, hollow prism, hollow circular truncated hollow prism, hollow truncated prism, preferably hollow cylinder. Specifically, the specific surface area of ​​the hollow particles can be designed according to equipment power and product requirements, and is not limited here.

[0054] The circulating medium in the tube of the high temperature side evaporator is R134a, and the circulating medium in the tube of the low temperature side evaporator is R22; the circulating medium in the tube of the high temperature side heating heat exchanger and the low temperature side heating heat exchanger is water.

[0055] The high-temperature side heating heat exchanger and the low-temperature side heating heat exchanger tubes are all ma...

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Abstract

The invention provides an anti-explosion low-energy-consumption type low-temperature sludge drying granulation process, which adopts a hot air circulation drying system and a bipolar heat pump dehumidification system. According to the invention, by changing the shape of sludge and strengthening air flow in a hot air drying system, the heat and humidity exchange rate of the sludge from inside to outside is effectively improved, the granulation quality is remarkably improved, the operation temperature of a dehumidification heat pump can be reduced, it is guaranteed that the suction and exhaust temperature of a compressor is within the optimal interval, the system operation efficiency is remarkably improved, and the possibility of burnout and mechanical faults of a compressor motor is reduced; and by reducing the in-pipe operation pressure of a heat exchanger in contact with hot air and changing the material of the heat exchanger, the leakage probability of the heat exchanger is effectively reduced, and the service life of equipment parts is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of air energy heat pumps, in particular to an explosion-proof low-energy consumption low-temperature sludge drying and granulation process. Background technique [0002] Low temperature sludge drying technology is a dehumidification heat pump technology. The dehumidification heat pump is a device that uses the refrigeration system to cool and dehumidify the hot and humid air while recovering the latent heat of condensation of air moisture through the heat pump principle to heat the air. Dehumidification heat pump = combination of dehumidification (dehumidification and drying) + heat pump (energy recovery). The sludge dehumidification and drying machine uses a dehumidification heat pump to condense and dehumidify the sludge with hot air circulation; the dehumidification and drying is to recover the latent heat of water vapor in the exhaust air and the sensible heat of the air, and there is no waste heat disc...

Claims

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Application Information

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IPC IPC(8): C02F11/13
CPCC02F11/13
Inventor 李明陈传文吴晓松茅国杰史文庆
Owner 南京韩测环境科技有限公司
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