CN218910131U

CN218910131U - Heat self-balancing sludge treatment system

Info

Publication number: CN218910131U
Application number: CN202223510161.4U
Authority: CN
Inventors: 朱伟娜; 魏晓东; 王艳民; 马淑叶
Original assignee: Henan Aierwang New Energy And Environment Co ltd
Current assignee: Henan Aierwang New Energy And Environment Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-04-25
Anticipated expiration: 2032-12-28

Abstract

The utility model belongs to the technical field of sludge treatment, and particularly relates to a heat self-balancing sludge treatment system which comprises a concentration tank, a plate frame dehydrator, a sludge drier, a sludge carbonization machine and a combustion chamber; the combustible gas output by the sludge carbonization machine enters a combustion chamber and is matched with air for combustion to form high-temperature flue gas, the combustion chamber sends the high-temperature flue gas into the sludge carbonization machine, and the high-temperature flue gas led out from the sludge carbonization machine is sent into a sludge drying machine for heat drying and dehydration of sludge; the conditions that the self-balancing of the system heat needs to meet are: q is more than or equal to Q1+Q2, wherein Q is the heat released by combustion of combustible gas, Q1 is the heat required by sludge drying, and Q2 is the heat required by sludge carbonization. The utility model can utilize the heat value of the sludge to the greatest extent, realize the heat self-balance of the sludge treatment system, and realize the sludge reduction, harmless, stabilization and recycling treatment under the conditions of reducing investment and energy consumption.

Description

Heat self-balancing sludge treatment system

Technical Field

The utility model belongs to the technical field of sludge treatment, and particularly relates to a heat self-balancing sludge treatment system.

Background

Along with the increasingly strict treatment and disposal requirements of factory sludge of sewage treatment plants in China, a plurality of sewage treatment plants begin to pay attention to the treatment and disposal of the sludge from the original heavy water and light mud. However, in the sludge treatment process, energy is inevitably consumed, the electric energy requirement is easy to meet (such as increasing the capacity of a transformer), but the heat energy requirement is relatively complex, especially in a sewage treatment plant with early construction and peripheral far away from heat energy supply, and the site and condition for installing heat energy supply equipment are not provided (the environment protection has strict requirements on the heat energy generation device, mainly the discharge of a boiler).

The carbonization of sludge is a sludge stabilization process in which pyrolysis treatment is carried out under anaerobic or anoxic conditions to obtain a carbon-containing solid product as a main target product. Organic matters contained in the sludge can be decomposed in the carbonization process to generate pyrolysis gas composed of CO, H2, low-molecular organic matters, water vapor and the like. Due to the evaporation of the moisture and the volatilization of the pyrolysis gas, the residual substances in the sludge gradually form sludge carbide which has developed surface and internal pores and is rich in fixed carbon. The sludge carbide has good stability in biological, chemical, physical and other aspects and has good resource utilization prospect in a plurality of fields.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a heat self-balancing sludge treatment system, which utilizes the heat value of sludge to the greatest extent, realizes the heat self-balancing of the sludge treatment system, and realizes the sludge reduction, harmless, stabilization and recycling treatment under the condition of reducing investment and energy consumption.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a heat self-balancing sludge treatment system which comprises a concentration tank, a plate frame dehydrator, a sludge drier, a sludge carbonization machine and a combustion chamber, wherein a sludge input port of the concentration tank is connected with a secondary sedimentation tank, a sludge output port of the concentration tank is connected with a sludge input port of the plate frame dehydrator, a sludge output port of the plate frame dehydrator is connected with a sludge input port of the sludge drier, and a sludge output port of the sludge drier is connected with a sludge input port of the sludge carbonization machine; the combustible gas output by the sludge carbonization machine enters a combustion chamber and is matched with air for combustion to form high-temperature flue gas, the combustion chamber sends the high-temperature flue gas into the sludge carbonization machine, and the high-temperature flue gas led out from the sludge carbonization machine is sent into a sludge drying machine for heat drying and dehydration of sludge; the conditions that the self-balancing of the system heat needs to meet are: q is more than or equal to Q1+Q2, wherein Q is the heat released by combustion of combustible gas, Q1 is the heat required by sludge drying, and Q2 is the heat required by sludge carbonization.

Further, the system also comprises a conditioning tank positioned between the concentration tank and the plate frame dehydrator, wherein agents such as polyaluminum chloride (PAC) and Polyacrylamide (PAM) are added into the conditioning tank.

Further, the addition amount of the polyaluminum chloride PAC is 0.4 ton of medicament per ton of dry sludge, and the addition amount of the polyacrylamide PAM is 0.002 ton of medicament per ton of dry sludge.

Further, the temperature of the high-temperature flue gas sent into the sludge carbonization machine by the combustion chamber is 800 ℃, and the temperature of the high-temperature flue gas sent into the sludge drying machine by the sludge carbonization machine is 350 ℃.

Further, the high-temperature flue gas from the sludge drier passes through a cyclone dust collector, enters a spray washing tower for washing and cooling, and is discharged into the atmosphere; and the water inlet of the spray washing tower adopts water filtered by the outer drain of a sewage treatment plant.

Further, when the water content of the plate and frame dewatered sludge is 60%, the carbonization temperature of the sludge is 500 ℃, the organic matter content of the sludge is 45%, the sludge drying efficiency is 80%, the sludge carbonization efficiency is 40%, and the gasification rate of the organic matters of the sludge is 85%, the system realizes self-balancing of heat quantity of Q not less than Q1+Q2.

Compared with the prior art, the utility model has the following advantages:

the heat self-balancing sludge treatment system of the utility model uses the plate-frame dehydrator to dehydrate, so as to reduce the water content of the sludge to the greatest extent, the dehydrated sludge is dried and carbonized, and the heat required by the drying and carbonization of the sludge is provided by the combustion of combustible gas generated in the carbonization process of the sludge; organic matters in the sludge are decomposed into combustible gas (the main components are CO, CH4, H2 and the like) in the high-temperature carbonization and pyrolysis process, the combustible gas is led out and then enters a combustion chamber for combustion to form high-temperature flue gas, heat is firstly supplied to a sludge carbonization machine, and the flue gas is led out of the sludge carbonization machine and then enters a sludge drying machine to be in countercurrent contact with the sludge, so that the sludge is dried. The system can utilize the heat value of the sludge to the greatest extent, realize the heat self-balance of the sludge treatment system, realize the sludge reduction, harmless, stabilization and recycling treatment under the condition of reducing investment and energy consumption, and has better economic value and social value.

Drawings

Fig. 1 is a schematic structural diagram of a heat self-balancing sludge treatment system according to an embodiment of the present utility model.

The meaning represented by the numbers in the figures is:

1. the device comprises a concentration tank, a conditioning tank, a plate-frame dehydrator, a sludge dryer, a sludge carbonization machine, a combustion chamber, a cyclone dust collector and a spray washing tower.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments.

As shown in fig. 1, the heat self-balancing sludge treatment system of the embodiment comprises a concentration tank 1, a conditioning tank 2, a plate frame dehydrator 3, a sludge drier 4, a sludge carbonization machine 5 and a combustion chamber 6; the sludge input port of the concentration tank 1 is connected with the secondary sedimentation tank, the sludge output port of the concentration tank 1 is connected with the sludge input port of the conditioning tank 2, the sludge output port of the conditioning tank 2 is connected with the sludge input port of the plate frame dehydrator 3, the sludge output port of the plate frame dehydrator 3 is connected with the sludge input port of the sludge drier 4, and the sludge output port of the sludge drier 4 is connected with the sludge input port of the sludge carbonization machine 5. The combustible gas output by the sludge carbonization machine 5 enters a combustion chamber 6, and is matched with air to burn to form high-temperature flue gas, the combustion chamber 6 sends the high-temperature flue gas into the sludge carbonization machine 5, and the high-temperature flue gas led out from the sludge carbonization machine 5 is sent into a sludge drying machine 4 to carry out heat drying dehydration on the sludge.

The addition of the medicaments polyaluminium chloride PAC and the polyacrylamide PAM in the conditioning tank 2 can condition the sludge to improve the dehydration performance of the sludge, the addition of the polyaluminium chloride PAC is 0.4 ton of the medicament per ton of the dry-basis sludge, the addition of the polyacrylamide PAM is 0.002 ton of the medicament per ton of the dry-basis sludge, the concrete addition can be regulated according to the water content of the sludge after the plate frame dehydration, and the lower the water content of the sludge after the dehydration is, the larger the required medicament amount is, so that the proper water content of the sludge needs to be selected according to practical conditions.

The reason for the dehydration by the plate and frame dehydrator 3 is that the energy consumption for the mechanical dehydration is far lower than that of the desiccation dehydration, so the technology for reducing the water content of the sludge adopts the principle that the mechanical dehydration can be adopted as far as possible (the prior plate and frame dehydration technology realizes full automation).

The temperature of the high-temperature flue gas sent into the sludge carbonization machine 5 by the combustion chamber 6 is about 800 ℃, and the temperature of the high-temperature flue gas sent into the sludge drying machine 4 by the sludge carbonization machine 5 is about 350 ℃.

There are two places in the system where heat input is required: the sludge drier Q1 and the sludge carbonizing machine Q2 have only one place capable of outputting heat in the system: heat Q released by combustion of the combustible gas; the conditions that the system needs to meet to achieve heat self-balance are: q is more than or equal to Q1+Q2, wherein Q is the heat released by combustion of combustible gas, Q1 is the heat required by sludge drying, and Q2 is the heat required by sludge carbonization.

The heat Q1 required for sludge drying is directly related to the water content of the imported sludge. Compared with sludge drying, the heat quantity Q2 required by sludge carbonization is less, and the heat quantity Q2 is directly related to carbonization temperature. The heat Q released by the combustion of the combustible gas is directly related to the content of organic matters in the sludge, the higher the content of the organic matters in the sludge is, the more the combustible gas is released during carbonization of the sludge, the more the heat released during combustion of the combustible gas is, and the more the heat provided for drying and carbonization of the sludge is.

The working principle is as follows:

excess sludge withdrawn from the bottom of the secondary sedimentation tank is pumped to a concentration tank 1, in which concentration tank 1 the sludge water content is reduced from about 99% to about 96%, and then sent to a conditioning tank 2. In the conditioning tank 2, the medicaments PAC and PAM are added, the sludge added with the medicaments is sent into a plate-and-frame dehydrator 3 for dehydration, the water content of the dehydrated sludge is about 60% (the water content of the dehydrated sludge can reach 55% -60% in the existing plate-and-frame dehydration), and the dehydrated water enters the front end of a sewage treatment plant for treatment.

The dehydrated sludge is sent into a sludge drier 4 for heat drying and dehydration by a screw or scraper conveyor, and a heat source required by the sludge heat drying is from high-temperature flue gas led out between the inner layer and the outer layer of a sludge carbonization machine 5, wherein the temperature of the flue gas is about 350 ℃; the water content of the sludge after heat drying is about 10%, and then the sludge is sent into a sludge carbonization machine 5 for carbonization.

In the sludge carbonizer 5, the sludge is heated by the insulating air. The heating medium is pyrolysis combustible gas led out from the outlet of the sludge carbonization machine 5, the combustible gas enters the combustion chamber 6 and is matched with air for combustion to form high-temperature flue gas, and the temperature of the high-temperature flue gas is about 800 ℃. The high-temperature flue gas enters between the inner layer and the outer layer of the sludge carbonization machine 5, and indirectly heats the sludge in the inner layer, so as to achieve the purpose of carbonization and pyrolysis of the sludge. The high-temperature flue gas led out from the space between the inner layer and the outer layer of the sludge carbonization machine 5 is sent into a sludge drying machine 4 to carry out heat drying dehydration on the sludge.

The high-temperature flue gas from the sludge drier 4 is subjected to dust removal by a cyclone dust collector 7 at the temperature of about 100 ℃, enters a spray washing tower 8 for washing and cooling, and is discharged into the atmosphere; the water inlet of the spray washing tower 8 adopts water filtered by the outer discharge of the sewage treatment plant, and the discharged water can be discharged into the front end of the sewage treatment plant for treatment.

According to calculation, when the water content of the plate and frame dewatered sludge is 60%, the carbonization temperature of the sludge is 500 ℃, the organic matter content of the sludge is 45%, the sludge drying efficiency is 80%, the sludge carbonization efficiency is 40%, and the gasification rate of the organic matters of the sludge is 85%, the system can realize self-balancing of heat quantity of Q more than or equal to Q1+Q2. The system achieves these process conditions of self-balancing heat, which are easily met in practical operation.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The use of the terms "a" or "an" and the like in the description and in the claims does not necessarily imply a limitation on the amount. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims

1. The heat self-balancing sludge treatment system is characterized by comprising a concentration tank, a plate frame dehydrator, a sludge drier, a sludge carbonization machine and a combustion chamber, wherein a sludge input port of the concentration tank is connected with a secondary sedimentation tank, a sludge output port of the concentration tank is connected with a sludge input port of the plate frame dehydrator, a sludge output port of the plate frame dehydrator is connected with a sludge input port of the sludge drier, and a sludge output port of the sludge drier is connected with a sludge input port of the sludge carbonization machine; the combustible gas output by the sludge carbonization machine enters a combustion chamber and is matched with air for combustion to form high-temperature flue gas, the combustion chamber sends the high-temperature flue gas into the sludge carbonization machine, and the high-temperature flue gas led out from the sludge carbonization machine is sent into a sludge drying machine for heat drying and dehydration of sludge; the conditions that the self-balancing of the system heat needs to meet are: q is more than or equal to Q1+Q2, wherein Q is the heat released by combustion of combustible gas, Q1 is the heat required by sludge drying, and Q2 is the heat required by sludge carbonization.

2. The heat self-balancing sludge treatment system of claim 1, further comprising a conditioning tank positioned between the thickening tank and the sheet frame dewatering machine.

3. The heat self-balancing sludge treatment system according to claim 1, wherein the high-temperature flue gas from the sludge drier passes through a cyclone dust collector, enters a spray washing tower for washing and cooling, and is discharged into the atmosphere; and the water inlet of the spray washing tower adopts water filtered by the outer drain of a sewage treatment plant.