CN217351146U

CN217351146U - Energy-saving utilization system for recycling sludge in domestic sewage treatment plant

Info

Publication number: CN217351146U
Application number: CN202122348438.7U
Authority: CN
Inventors: 林培斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-09-02
Anticipated expiration: 2031-09-27

Abstract

The utility model discloses an energy-conserving system of utilizing of domestic sewage treatment plant recovered mud, include: the gasification furnace comprises a furnace body, a biomass particle feeding port, a sludge particle feeding port, a biomass fuel gas outlet, a water vapor and air inlet, wherein the sludge particle feeding port is communicated with the sewage drying device; the steam boiler comprises a combustor and a water jacket arranged around the outer wall of the combustor, a biomass fuel gas inlet and a combustion-supporting gas inlet are formed in the bottom wall of the combustor, the biomass fuel gas inlet is communicated with a biomass fuel gas outlet of the gasification furnace, a hot flue gas outlet is formed in the side wall of the combustor, a water inlet is formed in the side wall of the water jacket, and a high-pressure steam outlet is formed in the top wall of the water jacket; the steam turbine power generation device is connected with a high-pressure steam outlet of a steam boiler through a high-pressure steam conveying pipeline.

Description

Energy-saving utilization system for recycling sludge in domestic sewage treatment plant

Technical Field

The utility model relates to a domestic sewage treatment field, in particular to domestic sewage treatment plant retrieves mud system.

Background

Domestic sewage is wastewater discharged in daily life of residents and mainly comes from residential buildings and public buildings, such as houses, institutions, schools, hospitals, shops, public places, industrial enterprise toilets and the like. The pollutants contained in the domestic sewage are mainly organic matters (such as protein, carbohydrate, fat, urea, ammonia nitrogen and the like) and a large amount of pathogenic microorganisms (such as parasitic ova, enteroinfectious viruses and the like). Organic matters existing in domestic sewage are extremely unstable and easily become rotten to generate offensive odor. Bacteria and pathogens propagate in large quantities by taking organic matters in domestic sewage as nutrition, and can cause epidemic of infectious diseases. Therefore, domestic sewage needs to be treated before being discharged, and sludge recovery is involved in the treatment process, but in the prior art, a mode of precipitating and then exposing the sludge to the sun is generally adopted, but the mode has the disadvantages of limited sludge treatment quantity, large required area and space, poor sanitation and high labor intensity.

In the sewage treatment process, a large amount of sludge is discharged along with the sewage treatment. The increasing of the sludge production amount and the serious shortage of the sludge treatment capability and the serious laggard treatment means form a sharp contradiction, the sludge treatment problem becomes an unavoidable urban environment problem, and therefore an economic and environment-friendly sludge treatment system for domestic sewage is urgently needed.

For example, a system for realizing energy saving and reduction by utilizing sludge in a sewage treatment plant disclosed in chinese patent application No. 201210370275.5, comprises an aeration tank, a concentration tank, a fermentation tank, a biogas purifier, a biogas generator and a dryer which are connected in sequence, wherein the biogas generator is simultaneously communicated with the aeration tank and the fermentation tank; the concentration tank is simultaneously communicated with a sedimentation tank and a deodorization device, a filter press is arranged between the concentration tank and the fermentation tank, and the filter press is simultaneously communicated with the concentration tank and the fermentation tank; a water heater is arranged between the biogas generator and the fermentation tank, and the water heater is simultaneously communicated with the biogas generator and the fermentation tank; and a filter press is arranged between the concentration tank and the fermentation tank, after the sludge in the aeration tank is aerated, the residual sludge and the precipitated sludge in the sedimentation tank are discharged into the concentration tank for concentration, the concentrated sludge is subjected to filter pressing through the filter press, the sludge subjected to filter pressing is pushed into the fermentation tank for fermentation, and the methane generated in the fermentation tank is treated by a methane purifier and a compression supercharger and is finally conveyed to a methane generator for power generation. However, the system for realizing energy saving and reduction by using sludge in the sewage treatment plant has the following disadvantages or shortcomings: (1) the cost of sewage and sludge treatment is high; (2) and a large amount of electric energy is needed in the sewage treatment process.

For another example, the method for treating sewage in a power generation system, which is disclosed in chinese patent application No. 201910136036.5, includes: primarily settling to remove suspended matters, utilizing a homogenizing tank and a homogenizing tank to make the water inflow and the water quality of the inflow uniform, carrying out anaerobic reaction in an anaerobic reaction tank, collecting biogas generated by the anaerobic reaction, introducing the biogas into an incinerator for incineration to generate high-temperature flue gas, carrying out denitrification treatment by nitrification, then carrying out solid-liquid separation by membrane biological reaction, and making sewage generate biochemical reaction; and then removing macromolecular organic matters and high-valence charged ions in the water further through nanofiltration to obtain treated clear liquid, finally collecting sludge generated in each step, uniformly preheating and drying, and feeding the dried sludge into an incinerator for incineration. However, the energy-saving and environment-friendly sewage treatment method in the power generation system has the following disadvantages or shortcomings: (1) the sewage and sludge treatment process is complicated and high in cost; (2) and the heat generated by the combustion of the sludge is not fully utilized.

Therefore, the energy-saving utilization system which has low treatment cost, can fully utilize the recovered sludge and realize the energy recycling of the sewage treatment plant for recovering the sludge in the domestic sewage treatment plant is a problem which is urgently needed to be solved in the industry.

Disclosure of Invention

The utility model aims at providing an energy-conserving utilization system of domestic sewage treatment plant recovery mud, its mud that can fully do benefit to the recovery produces the living beings gas, recycles the heat energy formation steam that the burning of living beings gas produced, and steam and then production electric energy supplies the user to use.

In order to realize the above purpose, the utility model provides an energy-conserving system that utilizes of domestic sewage treatment plant recovered mud, include: the sewage drying device is used for dehydrating and drying domestic sewage into sludge particles, the gasification furnace comprises a furnace body, the top wall of the furnace body is provided with a biomass particle feeding hole and a sludge particle feeding hole, the side wall of the furnace body is provided with a biomass fuel gas outlet, the bottom wall of the furnace body is provided with a water vapor and air inlet, and the sludge particle feeding hole is communicated with the sewage drying device; the steam boiler comprises a combustor for combusting biomass gas and a water jacket arranged around the outer wall of the combustor so as to prepare water vapor by using heat generated by combustion of the biomass gas, a biomass gas inlet and a combustion-supporting gas inlet are formed in the bottom wall of the combustor, the biomass gas inlet is communicated with a biomass gas outlet of the gasification furnace through a biomass gas conveying pipeline, a hot flue gas outlet is formed in the side wall of the combustor, a water inlet is formed in the side wall of the water jacket, and a high-pressure steam outlet is formed in the top wall of the water jacket; the steam turbine power generation device is connected with a high-pressure steam outlet of the steam boiler through a high-pressure steam conveying pipeline so as to generate electric energy by utilizing the high-pressure steam.

Optionally, the sewage drying apparatus includes: the sludge-water separator, the primary dryer, the secondary dryer and the granulator are sequentially connected through a sludge pipeline, wherein the sludge-water separator is used for separating solids in the domestic sewage to form sludge with the water content of 90-95%; the primary dryer is used for drying the sludge with the water content of 90-95% into the sludge with the water content of 40-45%; the secondary dryer is used for drying the sludge with the water content of 40-45% into the sludge with the water content of 15-20%; the granulator is used for mixing the sludge with the water content of 15-20% with the wood chips to prepare sludge granules with the water content of 10-15%.

Optionally, the primary dryer is a fluidized dryer, the fluidized dryer includes a first dryer body, a first sludge inlet is arranged on the top wall of the first dryer body, a hot flue gas inlet is arranged on the bottom wall of the first dryer body, a first sludge outlet and a cold flue gas outlet are arranged on the side wall of the first dryer body, the hot flue gas inlet is communicated with the hot flue gas outlet of the steam boiler through a flue gas pipeline, and the first sludge inlet is connected with the mud-water separator through a sludge pipeline to receive sludge with the water content of 90% -95% for drying.

Optionally, the flue gas pipeline is provided with a flue gas branch connected with the chimney, and the flue gas branch is provided with a valve to control the flow of hot flue gas exhausted by the steam boiler entering the first dryer body and the flow entering the flue gas branch.

Optionally, a dust remover and a second fan are further sequentially arranged on the flue gas branch to guide the flue gas subjected to dust removal and purification to the chimney.

Optionally, an air distribution plate is arranged in the inner cavity of the primary dryer body and adjacent to the bottom wall to divide the inner cavity of the primary dryer body into a drying area located above and a ventilation area located below, and a plurality of air caps extending towards the drying area are uniformly distributed on the air distribution plate to uniformly guide and spray hot flue gas entering through a hot flue gas inlet into the drying area so as to dry sludge with the water content of 90% -95% located in the drying area.

Optionally, the secondary dryer is a vacuum dryer, the vacuum dryer comprises a second dryer body and a hot water jacket arranged around the outer wall of the second dryer body, the top wall of the second dryer body is provided with a second sludge inlet and a drying gas outlet, the bottom wall of the second dryer body is provided with a second sludge outlet, and the hot water jacket is provided with a hot water inlet and a cold water outlet; the second sludge inlet is connected with the first sludge outlet through a sludge pipeline to receive sludge with the water content of 40-45% for drying, and the second sludge outlet is connected with the granulator to convey sludge with the water content of 15-20%; the drying gas outlet is communicated with the water vapor and air inlet of the gasification furnace through a steam pipeline by a vacuum pump; the cold water outlet is communicated with the water inlet of the steam boiler.

Optionally, a first mixer is arranged on the steam pipeline, the first mixer is provided with a first gas inlet, a second gas inlet, a third gas inlet and a mixed gas outlet, wherein the first gas inlet is communicated with the vacuum pump, the second gas inlet is communicated with the cold flue gas outlet of the first dryer, the third gas inlet is communicated with the air source, and the mixed gas outlet is communicated with the water vapor and air inlet of the gasification furnace through the first fan.

The utility model has the advantages that: (1) the potential energy of the sludge is fully excavated, so that the sludge and biomass particles generate biomass gas in a gasification furnace, and the steam generated by the combustion of the biomass gas is used for generating electricity, thereby saving energy and protecting environment; (2) the sludge is dried in multiple stages by fully utilizing the heat released by the steam boiler and the gasification furnace, so that the sludge is fully dried, the smoke energy and the steam energy of the steam boiler and the gasification furnace are utilized more thoroughly, and the energy utilization rate is improved; (3) the arrangement of the air distribution plate and the air cap in the first dryer can uniformly guide the flue gas into the drying area, so that the drying efficiency is improved.

Drawings

Fig. 1 shows a schematic configuration diagram of an energy-saving utilization system for recycling sludge in a domestic sewage treatment plant according to the present invention.

Fig. 2 shows a schematic configuration diagram of the primary dryer of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1, as a non-limiting embodiment, the energy-saving utilization system for recycling sludge from a domestic sewage treatment plant provided by the present invention comprises: a mud-water separator 1, a primary dryer 2, a secondary dryer 3, a granulator 4, a gasification furnace 5, a steam boiler 6 and a steam turbine power generation device 7.

Wherein, the mud-water separator 1, the primary dryer 2, the secondary dryer 3 and the granulator 4 form a sewage drying device which can dehydrate and dry domestic sewage into sludge particles. Specifically, the sludge-water separator 1 is used for separating solids in the domestic sewage to form sludge with the water content of 90% -95%, the primary dryer 2 is used for drying the sludge with the water content of 90% -95% into the sludge with the water content of 40% -45%, the secondary dryer 3 is used for drying the sludge with the water content of 40% -45% into the sludge with the water content of 15% -20%, and the granulator 4 is used for mixing the sludge with the water content of 15% -20% with wood dust X to prepare sludge particles with the water content of 10% -15%.

The gasification furnace 5 comprises a furnace body 50, a biomass particle feed port 51 and a sludge particle feed port 52 are arranged on the top wall of the furnace body 50, a biomass gas outlet 53 is arranged on the side wall, a water vapor and air inlet 54 is arranged on the bottom wall, and the sludge particle feed port 52 is communicated with the granulator 4.

The steam boiler 6 comprises a burner (not shown in the figure) and a water jacket (not shown in the figure), wherein the bottom wall of the burner is provided with a biomass fuel gas inlet 61 and a combustion-supporting gas inlet 62, the biomass fuel gas inlet 61 is communicated with the biomass fuel gas outlet 53 of the gasification furnace 5 through a biomass fuel gas conveying pipeline L1, the side wall of the burner is provided with a hot flue gas outlet 63, the side wall of the water jacket is provided with a water inlet 64, and the top wall of the water jacket is provided with a high-pressure steam outlet 65.

The steam turbine 7 is connected to the high-pressure steam outlet 65 of the steam boiler 6 through the high-pressure steam supply line L2, so that electric power can be generated using the high-pressure steam.

In this non-limiting embodiment, as shown in fig. 1, the primary dryer 2 is a fluidized dryer, and includes a first dryer body 20, a first sludge inlet 21 is disposed on a top wall of the first dryer body, a hot flue gas inlet 22 is disposed on a bottom wall of the first dryer body, a first sludge outlet 23 and a cold flue gas outlet 24 are disposed on a side wall of the first dryer body, wherein the hot flue gas inlet 22 is communicated with the hot flue gas outlet 63 of the steam boiler 6 through a flue gas pipeline L4, and the first sludge inlet 21 is connected with the sludge-water separator 1 through a sludge pipeline L5.

As another non-limiting embodiment, as shown in fig. 2, an air distribution plate 201 is disposed in the inner cavity of the primary dryer body 20 adjacent to the bottom wall, so as to divide the inner cavity of the primary dryer body 20 into an upper drying region 202 and a lower ventilating region 203, a plurality of air caps 204 extending toward the drying region 202 are uniformly distributed on the air distribution plate 201, and the hot flue gas entering through the hot flue gas inlet 22 is uniformly guided and sprayed into the drying region 202 by the plurality of air caps 204, so as to dry the sludge in the drying region 202, effectively utilize the heat of the hot flue gas exhausted from the steam boiler 6, and reduce the influence of a large amount of heat energy on the environment.

As shown in fig. 1, the secondary dryer 3 is a vacuum dryer, and includes a second dryer body 30 and a hot water jacket 32 surrounding the second dryer body 30, wherein a second sludge inlet 33 and a drying gas outlet 34 are disposed on the top wall of the second dryer body 30, a second sludge outlet 35 is disposed on the bottom wall of the second dryer body 30, and a hot water inlet 321 and a cold water outlet 322 are disposed on the hot water jacket 32. As shown in fig. 1, the second sludge inlet 33 is connected to the first sludge outlet 23 via a sludge pipe L5, the second sludge outlet 35 is connected to the granulator 4, the drying gas outlet 34 is connected to the water vapor and air inlet 54 of the gasifier 5 and the oxidant gas inlet 62 of the steam boiler 6 via a steam pipe L6 by a vacuum pump P1, and the cold water outlet 322 is connected to the water inlet 64 of the steam boiler 6.

As shown in fig. 1, a first mixer M1 is disposed on the steam line L6, the first mixer M1 is provided with a first gas inlet M11, a second gas inlet M12, a third gas inlet M13 and a mixed gas outlet M14, wherein the first gas inlet M11 is communicated with a vacuum pump P1, the second gas inlet M12 is communicated with the cold flue gas outlet 24 of the first dryer 2, the third gas inlet M13 is communicated with an air source, and the mixed gas outlet M14 is communicated with the water vapor and air inlet 54 of the gasification furnace 5 and the combustion-supporting gas inlet 62 of the steam boiler 6 via a first fan F1.

As another non-limiting embodiment, a flue gas branch L7 connected to the chimney Y is provided on the flue gas pipeline L4, and a valve F, a dust remover C and a second fan F2 are sequentially provided on the flue gas branch, so that the flow rate of the hot flue gas exhausted from the steam boiler 6 entering the first dryer body 2 and the flow rate of the hot flue gas entering the flue gas branch L7 are controlled by the valve F, and the dust remover C and the second fan F2 can guide the flue gas after dust removal and purification to the chimney Y.

Although preferred embodiments of the present invention have been described in detail herein, it is to be understood that the invention is not limited to the precise construction herein described and illustrated and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an energy-conserving system of utilizing of domestic sewage treatment plant recovered mud which characterized in that includes: a sewage drying device, a gasification furnace, a steam boiler and a steam turbine power generation device, wherein,

the gasification furnace comprises a furnace body, a biomass particle feeding port and a sludge particle feeding port are arranged on the top wall of the furnace body, a biomass gas outlet is arranged on the side wall of the furnace body, a steam and air inlet is arranged on the bottom wall of the furnace body, and the sludge particle feeding port is communicated with the sewage drying device;

the steam boiler comprises a combustor and a water jacket arranged around the outer wall of the combustor, a biomass gas inlet and a combustion-supporting gas inlet are formed in the bottom wall of the combustor, the biomass gas inlet is communicated with a biomass gas outlet of the gasification furnace through a biomass gas conveying pipeline, a hot flue gas outlet is formed in the side wall of the combustor, a water inlet is formed in the side wall of the water jacket, and a high-pressure steam outlet is formed in the top wall of the water jacket;

the steam turbine power generation device is connected with a high-pressure steam outlet of the steam boiler through a high-pressure steam conveying pipeline.

2. The system for recycling sludge of a domestic sewage treatment plant according to claim 1, wherein said sewage drying means comprises: a mud-water separator, a first-stage dryer, a second-stage dryer and a granulator which are connected in sequence through a sludge pipeline.

3. The energy-saving utilization system for recycling sludge of a domestic sewage treatment plant according to claim 2, wherein the primary dryer is a fluidized dryer, the fluidized dryer comprises a first dryer body, the top wall of the first dryer body is provided with a first sludge inlet, the bottom wall of the first dryer body is provided with a hot flue gas inlet, the side wall of the first dryer body is provided with a first sludge outlet and a cold flue gas outlet, the hot flue gas inlet is communicated with the hot flue gas outlet of the steam boiler through a flue gas pipeline, and the first sludge inlet is connected with the sludge-water separator through the sludge pipeline.

4. The energy-saving utilization system for recycling sludge of a domestic sewage treatment plant according to claim 3, wherein the flue gas pipeline is provided with a flue gas branch connected with a chimney, and the flue gas branch is provided with a valve.

5. The energy-saving utilization system for recycling sludge of a domestic sewage treatment plant according to claim 4, wherein a dust remover and a second fan are further sequentially arranged on the flue gas branch.

6. The energy-saving utilization system for recycling sludge of a domestic sewage treatment plant according to claim 5, wherein an air distribution plate is disposed in the inner cavity of the primary dryer body near the bottom wall to divide the inner cavity of the primary dryer body into an upper drying area and a lower ventilating area, and a plurality of air caps extending towards the drying area are uniformly distributed on the air distribution plate.

7. The energy-saving utilization system for recycling sludge in a domestic sewage treatment plant according to claim 6, wherein the secondary dryer is a vacuum dryer, the vacuum dryer comprises a second dryer body and a hot water jacket disposed around the outer wall of the second dryer body, the top wall of the second dryer body is provided with a second sludge inlet and a drying gas outlet, the bottom wall of the second dryer body is provided with a second sludge outlet, and the hot water jacket is provided with a hot water inlet and a cold water outlet; wherein the second sludge inlet is connected with the first sludge outlet through the sludge pipeline, and the second sludge outlet is connected with the granulator; the drying gas outlet is communicated with the water vapor and air inlet of the gasification furnace through a steam pipeline by a vacuum pump; the cold water outlet is communicated with the water inlet of the steam boiler.

8. The energy-saving utilization system for recycling sludge of a domestic sewage treatment plant according to claim 7, wherein the steam pipeline is provided with a first mixer, the first mixer is provided with a first gas inlet, a second gas inlet, a third gas inlet and a mixed gas outlet, wherein the first gas inlet is communicated with the vacuum pump, the second gas inlet is communicated with the cold flue gas outlet of the first dryer, the third gas inlet is communicated with an air source, and the mixed gas outlet is communicated with the water vapor and air inlets of the gasification furnace through a first fan.