WO2021097760A1

WO2021097760A1 - Sludge drying device with spraying and dust removal functions

Info

Publication number: WO2021097760A1
Application number: PCT/CN2019/119981
Authority: WO
Inventors: 森岡健二; 蔡文雄; 董俊; 刘启凯; 周章华; 赵欣平; 李正桥; 章鸣; 高峰
Original assignee: 西原环保工程(上海)有限公司; 上海友联竹园第一污水处理投资发展有限公司
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2021-05-27
Also published as: CN214270654U

Abstract

The present invention relates to the technical field of sludge drying and forming apparatuses, and in particular to a sludge drying device with spraying and dust removal functions. The sludge drying device comprises a sludge drying compartment body (10) and a dehumidification heating compartment body (20), wherein the two compartment bodies are connected by means of an upper air duct (30) and a lower air duct (40); the upper air duct (30) is provided with a fan (31), by means of the fan (31) air is conveyed to the sludge drying compartment body (10) from the dehumidification heating compartment body (20), the air passes through the sludge drying compartment body body (10) from top to bottom and then returns to the dehumidification heating compartment body (20) by means of the lower air duct (40); and a spraying dust removal device (21), a condensation dehumidification device (22) and a heating device (23) are mounted inside the dehumidification heating compartment body (20) from bottom to top in sequence. The sludge drying device has spraying and dust removal functions, by means of which fine particles and dust in moist air can be effectively removed, such that a heat exchanger channel is prevented from being blocked, downtime is not needed in the dust removal process, and continuous operation of the sludge drying device can be achieved.

Description

Sludge drying device with spray dust removal function

Technical field

The invention relates to the technical field of sludge drying and forming equipment, in particular to a sludge drying device with spray dust removal function.

Background technique

At present, low-temperature belt drying technology is often used for sludge drying in the market. The characteristic of low-temperature belt drying is that it does not require high heat sources. It can use heat sources such as heat pumps, solar energy or industrial waste heat, which is economical, environmentally friendly, energy-saving, and pollution-free. The low-temperature drying of the mud produces less dust, and there is no danger of explosion. In low-temperature belt sludge drying, circulating dry air is usually used to dehumidify and dry the sludge. The heated dry air is in full contact with the wet sludge in the drying device. The moisture in the wet sludge is taken out by the dry air and mixed into hot and humid air. Then the hot and humid air is cooled and cooled, and the water vapor in the hot and humid air becomes condensed. The water is separated, and the dehumidified air becomes dry air again and is heated by the heat source and circulated back to the sludge drying device. The advantage of using circulating air for drying is that there is no need to deodorize the air after drying the sludge, and the waste heat of the dried gas can be recycled, which greatly improves the utilization efficiency of heat energy.

The air with moisture from the sludge needs to undergo a process of condensation and dehumidification-heating and heating, and heat exchangers are usually used for heat exchange treatment. The hot and humid air is dehumidified by the condensing heat exchanger, and then heated by the heating heat exchanger. The problem with the use of heat exchangers is that the passages of the heat exchanger have small gaps and are easily blocked by dust carried in the air. When the air is in full contact with the sludge, it is easy to bring out the lighter dust in the sludge. When the air carrying dust passes through the heat exchanger, it is easy to block the passage of the heat exchanger. Therefore, before the circulating air flows out of the sludge drying device and enters the heat exchanger, a dust removal device is required. Usually, the dust removal device is a layer of filter cloth, which can filter the dust. The disadvantages of using filter cloth to filter are: 1. The filter cloth needs to be manually taken out and cleaned regularly. It needs to be shut down before cleaning and restarted after cleaning, resulting in a decrease in work efficiency; 2. Cleaning the filter cloth is time-consuming and laborious; 3. Filter cloth is installed. The dehumidification heating device will form a certain resistance and increase the wind resistance in the system.

The invention patent with publication number CN109893984A discloses a spray scrubbing system for sludge drying tail gas treatment, including an alkali scrubber, in which a first packing layer and a number of first spiral nozzles are sequentially arranged from bottom to top. , The second packing layer and a number of second spiral nozzles are located on the top of the second spiral nozzle with a defogging layer. The first spiral nozzle and the second spiral nozzle pass through the water inlet pipe and are connected to the alkaline storage tank outside the caustic washing tower. Connected, a water pump is also arranged on the water inlet pipe. The spray washing system of the invention is used to remove particles and acidic substances in the exhaust gas from sludge drying, and to deodorize and purify the exhaust gas, so that the exhaust gas from the sludge drying treatment reaches the emission standard. This sludge drying treatment technology is different from the drying technology used in the present invention. The drying technology used in the present invention uses circulating dry air to dry the wet sludge, and the entire compartment is closed. Yes, the gas always circulates in the closed compartment, so there is no need for gas purification treatment. The problems caused by this drying method are mentioned above. The humid air with dust or fine particles may block the passage of the heat exchanger, causing the heat exchanger to fail to work normally, and adding filter cloth to filter There are the above shortcomings.

Summary of the invention

In view of the above shortcomings, the present invention provides a sludge drying device with spray dust removal function, which can effectively remove fine particles and dust in the air, prevent blockage of the heat exchanger channel, and eliminate the need to stop the dust removal process, which can realize the pollution The mud drying device runs continuously.

The technical scheme of the present invention is:

A sludge drying device with spray dust removal function includes a sludge drying chamber and a dehumidification heating chamber. The two chambers are connected by an upper air duct and a lower air duct. The upper air duct is equipped with a fan. The air blower conveys air from the dehumidification heating chamber to the sludge drying chamber. The air passes through the sludge drying chamber from top to bottom, and then returns to the dehumidification heating chamber through the lower air duct. The interior of the dehumidification heating chamber is from bottom to top. The spray dust removal device, condensation dehumidification device and heating device are installed in sequence.

The spray dust removal device includes multiple rows of spray pipes and nozzles arranged on the spray pipes, and the spray pipes are arranged horizontally.

The spray pipes and nozzles are made of stainless steel.

The condensation and dehumidification device and the heating device are respectively a condensation heat exchanger and a heating heat exchanger.

The sludge drying device of the present invention is composed of a sludge drying chamber and a dehumidification heating chamber. The fan in the upper air duct conveys the heated dry air from the dehumidification heating chamber to the sludge drying chamber. The dry air is from top to bottom. After the sludge drying device, the moisture in the sludge is taken away, and it becomes hot and humid air, and then returns to the dehumidification heating chamber from the lower air duct, and then passes through the spray dust removal device and the condensation dehumidification device in the dehumidification heating chamber from bottom to top. And the heating device, it becomes hot and dry air again, forming an air circulation. The spray dust removal device is located at the bottom of the dehumidification heating compartment. It is composed of a spray pipe and a nozzle. It can spray fine water mist downward. The spray direction of the water mist is opposite to the airflow direction. The fine particles and the fine particles carried in the hot and humid air The dust is captured by the water mist and falls into the bottom layer of the dehumidification heating chamber under the action of gravity, and continues to enter the condensing heat exchanger and the heating heat exchanger with clean air that does not contain dust, which will not block the heat exchanger pipes, which is beneficial The heat exchanger continues to operate stably and normally.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the sludge drying device with spray dust removal function of the present invention;

Figure 2 is a front view of the spray dust removal device of the present invention;

Figure 3 is a top view of the spray dust removal device of the present invention.

Detailed ways

Hereinafter, the concept, specific structure and technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

1, the sludge drying device with spray dust removal function of the present invention includes a sludge drying chamber 10 and a dehumidification heating chamber 20. The two chambers are connected by an upper air duct 30 and a lower air duct 40, The upper air duct 30 is equipped with a fan 31. The fan 31 transports dry hot air from the dehumidification heating chamber 20 to the sludge drying chamber 10, and the dry air passes through the sludge drying chamber 10 from top to bottom to absorb the moisture in the sludge. It becomes hot and humid air, and then returns to the dehumidifying and heating compartment 20 through the lower air duct 40. The hot and humid air passes through the condensation dehumidification device 22 and the heating device 23 from bottom to top, and is dehumidified and heated by condensation to become hot dry air again, and then passes through the upper air duct. 30 returns to the sludge drying chamber 10 to form an air circulation. The condensation and dehumidification device 22 and the heating device 23 are respectively a condensation heat exchanger and a heating heat exchanger.

Since the air will take away the dust and fine particles in the sludge when passing through the sludge, it will return to the dehumidification heating compartment 20 with the downwind duct 40. In order to prevent the dust from clogging the passage of the heat exchanger, condensation inside the dehumidification heating compartment 20 A spray dust removal device 21 is arranged below the dehumidification device 22. 2 and 3, the spray dust removal device 21 includes multiple rows of spray pipes 211 and nozzles 212 arranged on the spray pipes. The spray pipes 211 are arranged above the down duct 40 and arranged horizontally. The number of spray pipes 211 and nozzles 212 can be flexibly set according to the cross-sectional area of the dehumidifying heating compartment 20 and the service area of the nozzles 212. In this embodiment, the spray pipes 211 have 3 rows, and each row is provided with 5 nozzles 212. The effect of complete coverage can be achieved. The water inlet of the pipe is arranged on the side of the dehumidification heating compartment 20, and a raised panel flange 213 is arranged on the side of the compartment as the interface between the spray pipe 211 and the external water source pipe in the compartment, and the inner spray pipe 211 and nozzle 212 All are made of stainless steel, and the external water source pipe is made of UPVC. The internal spray pipe 211 horizontally penetrates the dehumidification heating compartment 20, and the end is sealed by the top cover of the pipe.

When the sludge drying device is in operation, the spray dust removal device 21 is also continuously turned on. A certain pressure of water flows through the nozzle 212 to form fine droplets, and the sprayed water mist falls vertically, and its direction is opposite to the direction of the airflow coming from the downwind duct 40. The airflow is from bottom to top, and the fine particles and dust carried in the air are removed. The water mist is captured and falls into the bottom layer of the dehumidification heating compartment 20 under the action of gravity, while the clean air that removes dust continues upwards and enters the condensing dehumidification device 22 and the heating device 23. Since the air does not contain impurities, the pipes in the heat exchanger are not The sludge drying device can continue to operate stably, which is conducive to improving the efficiency of the sludge drying device, and simplifies the cleaning and dust removal process, and reduces the operation of the sludge drying device. cost.

The above-disclosed are only the embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be thought of by those skilled in the art should fall into the protection scope of the present invention.

Claims

A sludge drying device with spray dust removal function is characterized in that it comprises a sludge drying compartment (10) and a dehumidification heating compartment (20). The two compartments pass through an upper air duct (30) and The lower air duct (40) is connected, and the upper air duct (30) is equipped with a fan (31). The fan (31) transports air from the dehumidification heating chamber (20) to the sludge drying chamber (10). Go through the sludge drying compartment (10) from top to bottom, and then go back to the dehumidification heating compartment (20) through the lower air duct (40). The interior of the dehumidification heating compartment (20) is successively installed with spray dust removal devices from bottom to top (21), condensation and dehumidification device (22) and heating device (23).
The sludge drying device according to claim 1, characterized in that the spray dust removal device (21) comprises multiple rows of spray pipes (211) and nozzles (212) arranged on the spray pipes, and The spray pipes (211) are arranged horizontally.
The sludge drying device according to claim 1, wherein the spray pipe (211) and the nozzle (212) are made of stainless steel.
The sludge drying device according to claim 1, wherein the condensation dehumidification device (22) and the heating device (23) are respectively a condensation heat exchanger and a heating heat exchanger.