A system and process for incinerating wet sludge with domestic waste

Abstract

The present invention belongs to the field of sludge treatment technology, and specifically relates to a system and process for incinerating wet sludge with domestic waste. The system comprises a sludge storage unit, a sludge conveying unit, a sludge feeding unit, and an incinerator. The sludge storage unit is used to store wet sludge, and the sludge storage unit and the sludge feeding unit are connected via the sludge conveying unit. The sludge feeding unit is provided with two groups, and the two groups of sludge feeding units are respectively provided at the top of the incinerator and the rear arch of the incinerator. The present invention arranges the sludge feeding units at the top of the incinerator and the rear arch of the incinerator, respectively, so that the sludge enters the incinerator from the top and the rear arch respectively through the sludge feeding units. During the falling process of the sludge, it is baked by high-temperature flames and flue gas, and the wet sludge evaporates part of its water content after being heated. The remaining wet sludge solids have their moisture content reduced and are mixed with the garbage for incineration, thereby reducing the impact on the combustion of garbage in the combustion section.

Description

Technical Field

[0001] The invention relates to a system and process for incinerating wet sludge mixed with domestic garbage, and belongs to the technical field of sludge treatment. Background Art

[0002] Sludge is currently generated from river cleaning, industrial production, and residential life. With the continuous improvement of urban sewage treatment rates in my country, sludge production at urban sewage treatment plants has also increased dramatically. Among the various sludge disposal methods currently available in my country, sludge drying technology is the most widely used. In recent years, the domestic production of sludge drying system equipment has rapidly developed. Sludge co-incineration is a development trend in sludge thermal treatment, and large-scale demonstration projects have been implemented in China. With the rise of the municipal waste incineration power generation industry, attention has been focused on the co-incineration of wet sludge with waste, adopting a technology approach that removes some moisture from the sludge to increase its calorific value before co-incinerating it with the waste. This method generally utilizes the relatively mature thermal drying technology. However, existing thermal drying methods have high operating costs, especially the high-temperature exhaust gas and dry sludge generated during the drying process, where much of the inherent heat is wasted, resulting in high energy consumption. Furthermore, the disposal costs of odor and wastewater are also relatively high.

[0003] Therefore, reducing the heat waste in the process of garbage-co-sludge incineration and sludge drying, improving energy utilization, reducing the cost of sludge treatment and reducing the generation of pollutants are technical problems that technical personnel in this field urgently need to solve. Summary of the Invention

[0004] The present invention aims to solve the defects of the prior art and provides a system and process for incinerating wet sludge with domestic waste.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] One of the objects of the present invention is to provide a system for incinerating wet sludge with domestic waste, comprising a sludge storage unit, a sludge conveying unit, a sludge feeding unit and an incinerator; the sludge storage unit is used to store wet sludge, and the sludge storage unit and the sludge feeding unit are connected through the sludge conveying unit; the sludge feeding units are provided with two groups, and the two groups of sludge feeding units are respectively arranged on the top of the incinerator and the rear arch of the incinerator.

[0007] The beneficial effects of the domestic waste mixed with wet sludge burning system of the present invention are:

[0008] The present invention arranges sludge feeding units at the top and rear arch of the incinerator respectively, so that the sludge enters the incinerator from the top and rear arch respectively through the sludge feeding units. Before entering the incinerator, the sludge is dispersed and atomized at the outlet of the sludge feeding unit by compressed air, thereby reducing the volume of falling sludge particles and increasing the heating surface. During the falling process of the sludge, it is baked by high-temperature flames and flue gas, and part of the moisture in the wet sludge is evaporated after being heated. The moisture content of the remaining wet sludge solids is reduced and then mixed with garbage for incineration, thereby reducing the impact on the combustion of garbage in the combustion section.

[0009] On the basis of the above technical solution, the present invention can also make the following improvements:

[0010] Furthermore, the sludge feeding unit includes a plurality of insert plate feeders, which are installed on the furnace wall of the incinerator. A plurality of water-cooled wall pipes are arrayed on the furnace wall, and adjacent water-cooled wall pipes are connected by water-cooling fins. The insert plate feeders are installed on the water-cooling fins.

[0011] The beneficial effect of adopting the above-mentioned further technical solution is: the plug-in plate feeder is installed on the water-cooled fins of the incinerator wall. The cooling water in the water-cooled fins can cool the plug-in plate feeder, reduce the impact of the flame and high-temperature flue gas in the incinerator on the plug-in plate feeder, prevent the plug-in plate feeder from increasing in temperature due to long-term contact with high-temperature flame and high-temperature flue gas, and avoid damage to the plug-in plate feeder.

[0012] Furthermore, a mounting groove is provided on the water-cooled fin, and the mounting groove is V-shaped. The insert plate feeder is installed in the mounting groove. A gas pipe is provided on the groove wall of the mounting groove. One end of the gas pipe is connected to the compressed gas supply equipment, and a gas injection port is provided at the other end of the gas pipe, and the gas injection port is provided at the bottom of the mounting groove.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are: the mounting groove is V-shaped, and due to the effect of the deadweight of the insert plate feeder, the insert plate feeder is installed in the V-shaped mounting groove more tightly and stably, which plays a role of sealing and fixing to prevent leakage of materials or heat; the present invention is provided with a gas pipeline on the mounting groove, and the gas injection port is arranged at the bottom of the mounting groove (that is, the discharge end of the sludge feeding unit). When the sludge flows out from the discharge end of the insert plate feeder, the gas pipeline sprays the atomized gas, such as atomizing air, and the atomizing air is sprayed at the discharge end position to atomize the wet sludge flowing out of the discharge end. Under the action of the atomizing air spray, the wet sludge is atomized into small particles, which increases the contact area of ​​the small sludge particles with the high-temperature flue gas during the falling process, thereby improving the heat exchange efficiency between the sludge and the high-temperature flue gas, and can also accelerate the drying and combustion of the sludge. The present invention provides a gas pipeline on the installation trough, thereby spraying atomizing air toward the wet sludge at the discharge end. The atomizing air not only has the function of atomizing the wet sludge, but also can cool the installation trough and the insert plate feeder, thereby reducing the impact of high-temperature flue gas in the furnace on the installation trough and the insert plate feeder.

[0014] Furthermore, the insert plate feeder includes a hydraulic cylinder, an intermediate bracket and a feeding valve body, the hydraulic cylinder is installed on the top surface of the intermediate bracket, the feeding valve body is connected to the bottom surface of the intermediate bracket, the bottom of the feeding valve body is installed in the mounting groove, and a water cooling assembly is provided at the lower part of the feeding valve body, the water cooling assembly includes a water cooling cavity, the water cooling cavity is welded to the feeding valve body, and a cooling water inlet and a cooling water outlet are provided on the water cooling cavity, and the cooling water inlet and the cooling water outlet are respectively connected to the cooling water circulation pipeline.

[0015] The beneficial effect of adopting the above-mentioned further technical solution is: by providing a water cooling component at the lower part of the feeding valve body, the feeding valve body is continuously cooled by the water cooling component during the feeding process of the insert plate feeder, preventing the lower part of the feeding valve body and the valve body outlet from increasing in temperature due to long-term contact with high-temperature flames and high-temperature flue gas, thereby avoiding damage to the feeding valve body. The water cooling cavity is welded to the feeding valve body, and the feeding valve body is cooled by introducing cooling water into the water cooling cavity.

[0016] Furthermore, a plug plate is provided in the intermediate bracket, and the piston rod end of the hydraulic cylinder is connected to the plug plate. A through hole is provided at the bottom of the intermediate bracket, and the shape of the through hole is adapted to the cross-sectional shape of the plug plate. A cavity is provided in the feeding valve body, and the cross-sectional shape of the cavity is adapted to the cross-sectional shape of the plug plate. A valve body inlet is provided in the middle of the feeding valve body, and a valve body outlet is provided at the bottom of the feeding valve body, and the shape of the valve body outlet is adapted to the cross-sectional shape of the plug plate. A blanking hole is correspondingly provided on the water-cooling fin, and a notch is correspondingly provided at the bottom of the mounting groove.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is: the cross-sectional shape of the cavity of the feeding valve body and the shape of the valve body discharge port are set to be compatible with the shape of the plug plate. When the feeding valve body is blocked by the action of high-temperature flue gas and the sludge is dried, the plug plate can better scrape off the material on the inner wall of the feeding valve body when it moves up and down in the cavity driven by the hydraulic cylinder. When the plug plate moves to the valve body discharge port, it can better scrape off the dried sludge at the valve body discharge port and push it into the incinerator.

[0018] Furthermore, a heat-insulating material is poured on the water-cooled wall pipe, and the heat-insulating material wraps the installation groove; and a heat-insulating plate is provided on the cooling water circulation pipe.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is: after the installation of the plug-in feeder is completed, the interface and installation port between the plug-in feeder and the incinerator are sealed with insulation material to ensure sealing, and then the upper part of the cooling water circulation pipe is insulated with insulation board, which is convenient for inspection and maintenance of the cooling water circulation pipe and removal and maintenance of the plug-in feeder without destroying the insulation material, thereby reducing the waste of insulation material.

[0020] A second object of the present invention is to provide a wet sludge co-combustion process, which adopts the above-mentioned domestic waste co-combustion wet sludge system.

[0021] Furthermore, the wet sludge co-combustion process comprises the following steps:

[0022] (1) The transport vehicle transports the wet sludge to the sludge storage unit;

[0023] (2) The sludge conveying unit transports the wet sludge from the sludge storage unit to two groups of sludge feeding units respectively;

[0024] (3) The wet sludge entering the sludge feeding unit located on the top of the incinerator in step (2) enters the first flue of the incinerator from the sludge feeding unit, and then falls from the first flue to the front end of the secondary grate of the incinerator (i.e., the garbage combustion section of the incinerator) to be incinerated together with the garbage;

[0025] (4) The sludge entering the sludge feeding unit located at the rear arch of the incinerator in step (2) enters the furnace of the incinerator from the sludge feeding unit and falls to the front end of the third-stage grate of the incinerator (i.e., the garbage burning section of the incinerator). The garbage and slag on the second-stage grate fall to the third-stage grate and cover the sludge falling to the third-stage grate. The sludge and garbage are incinerated together to eventually form slag, which is discharged from the incinerator into the slag pit.

[0026] When the wet sludge falls into the first flue of the incinerator, it is baked by high-temperature flames and flue gas (temperature is 850℃-1100℃). Due to the high height difference between the furnace top and the secondary grate, the wet sludge stays in the high-temperature flames and flue gas for a long time (≥2S). After being heated, part of the water in the wet sludge can be evaporated, and the moisture content of the remaining wet sludge solids is reduced. It is mixed with garbage and incinerated together, reducing the impact on the combustion of garbage in the combustion section.

[0027] When the wet sludge falls into the incinerator furnace, it is baked by high-temperature flames and flue gas (temperature is 850℃-1100℃). Due to the small height difference from the rear arch to the third-level grate, the wet sludge stays in the high-temperature flames and flue gas for a short time (<1S). After the wet sludge is heated, a small amount of water evaporates, and the remaining wet sludge solids still have a high moisture content. It falls to the front end of the third-level grate (i.e. the garbage combustion section) and is mixed with the high-temperature garbage slag that is about to burn out. At this time, some garbage is still burning. The garbage and slag from the second-level grate will cover the fallen sludge after falling to the third-level grate. Since the grate continues to reciprocate, the sludge is mixed with the high-temperature slag under the action of the reciprocating motion of the grate, absorbs the heat of the slag, evaporates the remaining water and burns with the garbage. The incinerated sludge eventually forms slag and is discharged from the incinerator into the slag pit.

[0028] Furthermore, the sludge conveying unit includes a conveying pipeline, a hydraulic cone valve plunger pump, a cage-type impurity remover, a pressure transmitter, a maintenance gate valve 2 and an electric regulating valve. The conveying pipeline includes a main line, a first branch and a second branch. The hydraulic cone valve plunger pump, the cage-type impurity remover and the pressure transmitter are arranged on the main line. The hydraulic cone valve plunger pump is arranged at the discharge end of the sludge storage unit. The cage-type impurity remover is arranged at the discharge end of the hydraulic cone valve plunger pump. The feed end and the discharge end of the cage-type impurity remover are both provided with a pressure transmitter. The first branch and the second branch are respectively provided with the maintenance gate valve 2 and the electric regulating valve. The electric regulating valve is arranged at the front end of the sludge feeding unit, and the maintenance gate valve 2 is arranged at the front end of the electric regulating valve.

[0029] Furthermore, in step (2), the pushing pressure of the wet sludge in the conveying pipeline is increased to 2.5-5 MPa by the hydraulic cone valve plunger pump.

[0030] The beneficial effects of the wet sludge co-combustion process of the present invention are:

[0031] The present invention divides the wet sludge of the sludge storage unit into two routes and enters the incinerator respectively through a conveying pipeline. In one route, the wet sludge enters a plurality of insert plate feeders uniformly distributed horizontally (i.e., perpendicular to the direction of movement of the grate) on the top of the first flue on the furnace top from the first branch, then enters the first flue of the incinerator from the insert plate feeder and falls to the front end of the secondary grate, and is incinerated together with the garbage; in the other route, the wet sludge goes down from the second branch to the rear arch of the incinerator, enters a plurality of insert plate feeders uniformly distributed horizontally (i.e., perpendicular to the direction of movement of the grate) on the top of the rear arch of the incinerator between the tail section of the secondary grate and the front section of the tertiary grate, then enters the furnace of the incinerator from the plurality of insert plate feeders and falls to the front end of the tertiary grate, and is incinerated together with the garbage. The sludge is baked by high-temperature flames and flue gas during the process of entering the incinerator and falling. After being heated, part of the water in the wet sludge evaporates and is burned together with the garbage. The incinerated sludge eventually forms slag, which is discharged from the incinerator into the slag pit, thereby reducing the impact on the combustion of garbage in the combustion section. Before the wet sludge enters the incinerator from the outlet of the plug-in feeder, it is broken up and atomized by the compressed air set at the bottom of the V-shaped groove, which reduces the volume of the falling sludge particles and increases the heating surface of the sludge, thereby improving the evaporation efficiency of the water in the sludge and the incineration effect, thereby reducing the impact on the incineration conditions in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a simplified diagram of the wet sludge co-combustion process of the present invention;

[0033] Figure 2 This is a partial enlarged view of the incinerator of the system for incinerating wet sludge with domestic waste according to the present invention;

[0034] Figure 3 for Figure 2 A magnified view of point A;

[0035] Figure 4 for Figure 2 Enlarged view of point B;

[0036] Figure 5 This is a schematic structural diagram of a sludge storage unit of a system for incinerating wet sludge with domestic waste according to the present invention;

[0037] Figure 6 A side view of a silo of the system for incinerating wet sludge with domestic waste according to the present invention;

[0038] Figure 7 A top view of the silo of the system for incinerating wet sludge with domestic waste according to the present invention;

[0039] Figure 8 This is a schematic diagram of the installation of the insert plate feeder of the present invention;

[0040] Figure 9 for Figure 8 Enlarged view of point C;

[0041] Figure 10 for Figure 8 Partial enlarged view;

[0042] Figure 11 Schematic diagram of the internal structure of the insert plate feeder of the present invention;

[0043] Figure 12 It is a side view of the insert plate feeder of the present invention;

[0044] Figure 13 It is a cross-sectional view of the feeding valve body of the present invention.

[0045] The reference numerals are recorded as follows:

[0046] 1. Frame grid; 2. Silo; 3. Inspection gate valve 1; 4. Debris removal grate; 5. Pre-load screw feeder; 6. Hydraulic cone valve plunger pump; 7. Pressure transmitter; 8. Cage-type debris remover; 9. Inspection gate valve 2; 10. Delivery pipeline; 1001. Main line; 1002. First branch line; 1003. Second branch line; 11. Electric regulating valve; 12. Gate feeder; 1201. Hydraulic cylinder; 1202. Intermediate bracket; 1203. Feed valve body; 1204. Seal assembly; 1205. Valve body inspection port; 1206. Cavity; 1207. Gate; 1 208. Cover plate; 1209. Water-cooling assembly; 1210. Valve body feed port; 1211. Cooling water outlet; 1212. Cooling water inlet; 1213. Valve body discharge port; 1214. Cooling water circulation pipe; 13. Water-cooled fins; 14. Hydraulic station; 15. Hydraulic oil pipeline; 16. Water-cooled wall pipeline; 17. Mounting groove; 18. Gas pipeline; 19. Insulation material; 20. Insulation board; 100. Sludge storage unit; 200. Incinerator; 201. Secondary grate; 202. Tertiary grate; 203. First flue; 204. Furnace top; 205. Rear arch. DETAILED DESCRIPTION

[0047] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0048] The front and back mentioned in the present invention are based on the direction of the material. In the present invention, the material moves from front to back.

[0049] See also Figure 1-13A system for incinerating wet sludge with domestic waste includes a sludge storage unit 100, a sludge conveying unit, a sludge feeding unit and an incinerator 200; the sludge storage unit 100 is used to store wet sludge, and the sludge storage unit 100 and the sludge feeding unit are connected through the sludge conveying unit; the sludge feeding units are provided with two groups, and the two groups of sludge feeding units are respectively arranged on the furnace top 204 of the incinerator 200 and the rear arch 205 of the incinerator 200.

[0050] See also Figure 8-13 The sludge feeding unit includes a plurality of insert plate feeders 12, and the plurality of insert plate feeders 12 of each sludge feeding unit are arranged in parallel horizontally. The insert plate feeders 12 are installed on the furnace wall of the incinerator 200, and the plurality of insert plate feeders 12 are arranged in a line perpendicular to the movement direction of the grate. A plurality of water-cooled wall pipes 16 are arrayed on the furnace wall, and adjacent water-cooled wall pipes 16 are connected by water-cooling fins 13, and the insert plate feeders 12 are installed on the water-cooling fins 13.

[0051] The water-cooled fin 13 is provided with a mounting groove 17, which is welded to the water-cooled fin 13 and is V-shaped. The bottom of the insert plate feeder 12 is installed in the mounting groove 17, and a gas pipe 18 is provided on the groove wall of the mounting groove 17. One end of the gas pipe 18 is connected to a compressed gas supply device, and compressed gas, such as compressed air, is transported into the gas pipe 18 through the compressed gas supply device. The other end of the gas pipe 18 is provided with a gas injection port, which is provided at the bottom of the mounting groove 17. The bottom of the mounting groove 17 is provided with a notch for dropping wet sludge.

[0052] See also Figure 10-13The insert plate feeder 12 includes a hydraulic cylinder 1201, an intermediate bracket 1202 and a feeding valve body 1203. The hydraulic cylinder 1201 is installed on the top surface of the intermediate bracket 1202. The hydraulic cylinder 1201 is connected to the hydraulic station 14 through a hydraulic oil pipeline 15. The hydraulic oil power is provided to the hydraulic cylinder 1201 through the hydraulic station 14. The feeding valve body 1203 is connected to the bottom surface of the intermediate bracket 1202. A insert plate 1207 is provided in the intermediate bracket 1202. The piston rod end of the hydraulic cylinder 1201 is connected to the insert plate 1207. A through hole is provided at the bottom of the bracket 1202, and the shape of the through hole is adapted to the cross-sectional shape of the plug plate 1207. A cavity 1206 is provided in the feeding valve body 1203, and the cross-sectional shape of the cavity 1206 is adapted to the cross-sectional shape of the plug plate 1207. A valve body inlet 1210 is provided in the middle of the feeding valve body 1203, and a valve body outlet 1213 is provided at the bottom of the feeding valve body 1203, and the shape of the valve body outlet 1213 is adapted to the cross-sectional shape of the plug plate 1207. A water cooling component 1209 is provided at the lower part of the feeding valve body 1203. The water-cooling assembly 1209 includes a water-cooling cavity, which is welded to the feeding valve body 1203 . A cooling water inlet 1212 and a cooling water outlet 1211 are provided on the water-cooling cavity. The cooling water inlet 1212 and the cooling water outlet 1211 are respectively connected to a cooling water circulation pipe 1214 .

[0053] See also Figure 11 A sealing assembly 1204 is provided on the upper portion of the feeding valve body 1203, disposed between the insert plate 1207 and the feeding valve body 1203. As a preferred embodiment of the present invention, the sealing assembly 1204 is a sealing ring disposed on the inner wall of the upper portion of the feeding valve body 1203, and the shape of the sealing ring matches the cross-sectional shape of the insert plate 1207. The sealing assembly 1204 is provided between the insert plate 1207 and the feeding valve body 1203 to seal the material within the feeding valve body 1203 and prevent leakage from the gap between the insert plate 1207 and the feeding valve body 1203. Furthermore, the sealing ring is elastic and in close contact with the insert plate 1207. In addition to providing a seal for the material, the sealing ring also cleans the material dried on the surface of the insert plate 1207 due to high temperature through friction during the upward and downward movement of the insert plate 1207.

[0054] As a preferred embodiment of the present invention, the cross-sectional shape of the insert plate 1207 is square, and correspondingly, the shapes of the sealing ring, the cross-sectional shape of the cavity 1206, the valve body outlet 1213 and the through hole are all square.

[0055] The feeding valve body 1203 is provided with a valve body inspection port 1205, which is arranged corresponding to the valve body feed port 1210. A cover plate 1208 is provided on the valve body inspection port 1205. If foreign matter is trapped in the feeding valve body 1203 or the valve body feed port, causing material to become stuck, the valve body inspection port 1205 can be used for inspection and maintenance. The valve body inspection port 1205 is sealed by the cover plate 1208 when the insert plate feeder 12 is in operation. When maintenance is required, the cover plate 1208 can be opened for inspection.

[0056] The feed valve body 1203 comprises valve body 1 and valve body 2, which are arranged opposite each other. The cavity 1206 is formed between the valve body 1 and valve body 2. The valve body feed port 1210 is provided on valve body 1, and the valve body inspection port 1205 is provided on valve body 2. Water cooling components 1209 are provided at the bottom of each valve body 1 and valve body 2.

[0057] See also Figure 8-10 A heat-insulating material 19 is poured on the water-cooled wall pipe 16 , and the heat-insulating material 19 wraps the mounting groove 17 ; a heat-insulating plate 20 is provided on the cooling water circulation pipe 1214 .

[0058] The insert plate feeder 12 of the present invention is installed on the water-cooled fins 13 between the water-cooled wall pipes 16 of the incinerator 200, a blanking port is opened on the water-cooled fins 13 and a mounting groove 17 is welded, the bottom of the feeding valve body 1203 of the insert plate feeder 12 is installed in the mounting groove 17, and the valve body discharge port 1213 of the feeding valve body 1203 is installed correspondingly at the blanking port position of the water-cooled fin 13. After the insert plate feeder 12 is installed and fixed, the insulation material 19 is poured on the water-cooled wall pipe 16 to seal the interface and mounting port of the insert plate feeder 12 and the water-cooled fin 13, and then the insulation board 20 is used to seal the upper part of the cooling water circulation pipe 1214. The insulation board 20 is used to insulate the cooling water circulation pipe 1214, which is convenient for inspecting and repairing the cooling water circulation pipe 1214 and dismantling and repairing the insert plate feeder 12 without destroying the insulation material 19. The insulation board 20 is an aluminum silicate board.

[0059] See also Figure 5-6 The sludge storage unit 100 includes a silo 2, a frame grille 1 is provided on the upper part of the silo 2, a silo 2 discharge port is provided at the bottom of the silo 2, the silo 2 discharge port is connected to a pre-pressing screw feeder 5, and an inspection gate valve 3 and a debris removal grate 4 are provided on the silo 2 discharge port in sequence.

[0060] See also Figure 5The sludge conveying unit includes a conveying pipeline 10, a hydraulic cone valve plunger pump 6, a cage-type impurity remover 8, a pressure transmitter 7, a maintenance gate valve 2 9 and an electric regulating valve 11. The conveying pipeline 10 includes a main line 1001, a first branch line 1002 and a second branch line 1003. The hydraulic cone valve plunger pump 6, the cage-type impurity remover 8 and the pressure transmitter 7 are arranged on the main line 1001. The hydraulic cone valve plunger pump 6 is arranged at the discharge end of the sludge storage unit 100, the cage-type impurity remover 8 is arranged at the discharge end of the hydraulic cone valve plunger pump 6, and the feed end and discharge end of the cage-type impurity remover 8 are both provided with a pressure transmitter 7. The first branch line 1002 and the second branch line 1003 are respectively provided with the maintenance gate valve 2 9 and the electric regulating valve 11. The electric regulating valve 11 is arranged at the front end of the sludge feeding unit, and the maintenance gate valve 2 9 is arranged at the front end of the electric regulating valve 11. The discharge end of the pre-pressing screw feeder 5 is connected to the feed end of the hydraulic cone valve plunger pump 6 .

[0061] The maintenance gate valve 2 9 is used to isolate the sludge in the conveying pipeline 10. When the electric regulating valve 11 or the gate feeder 12 needs to be repaired, the maintenance gate valve 2 9 is manually closed to facilitate maintenance.

[0062] The electric regulating valve 11 is used to adjust the amount of sludge in the conveying pipeline 10 .

[0063] The pressure transmitter 7 is used to detect the sludge pushing pressure in the pipeline. Pressure transmitters 7 are installed on the feed end and the discharge end of the cage type impurity remover 8 to detect the pressure at both ends of the inlet and outlet of the cage type impurity remover 8 and judge the blockage of debris inside the cage type impurity remover 8.

[0064] The function of the maintenance gate valve 3 is: if the sludge feeding or mud beating effect in the material chamber of the hydraulic cone valve plunger pump 6 is not good, the maintenance gate valve 3 is manually closed to isolate the interface between the silo 2 and the downstream equipment, blocking the continued flow of sludge, and facilitating further inspection and maintenance of whether there are debris blocking the debris removal grate 4 and maintenance of equipment such as the pre-pressing screw feeder 5 and the hydraulic cone valve plunger pump 6.

[0065] See also Figure 1-7 A wet sludge co-combustion process using the above-mentioned domestic waste co-combustion wet sludge system specifically comprises the following steps:

[0066] (1) The transport vehicle transports the wet sludge with a moisture content of about 80% to the unloading area and dumps the wet sludge onto the frame grille 1. The frame grille 1 has the function of preliminarily removing and isolating large-sized impurities mixed in the sludge. The sludge falls into the silo 2 for temporary storage under the action of gravity; then the wet sludge passes through the inspection gate valve 3 to reach the impurity removal grate 4. The impurity removal grate 4 further removes and isolates smaller impurities mixed in the sludge. Then the wet sludge enters the pre-pressing screw feeder 5, which pushes the sludge into the material chamber of the hydraulic cone valve plunger pump 6;

[0067] (2) After the wet sludge enters the hydraulic cone valve plunger pump 6, the hydraulic plunger push cylinder of the hydraulic cone valve plunger pump 6 increases the pushing pressure of the sludge to 2.5-5MPa, and the sludge is pushed out of the hydraulic cone valve plunger pump 6 into the cage type impurity remover 8. The cage type impurity remover 8 removes and isolates the smaller impurities mixed in the sludge again to prevent the impurities from blocking the insert plate feeder 12. After the wet sludge is discharged from the cage type impurity remover 8, it passes through the pressure transmitter 7 and then reaches the top of the waste incinerator 200 through the conveying pipe 10, and then is divided into two ways to enter the sludge feeding unit;

[0068] (3) In one of the paths in step (2), the sludge passes through the maintenance gate valve 29 and the electric regulating valve 11 in the first branch 1002 in turn, and enters a plurality of gate feeders 12 uniformly distributed horizontally (i.e., at 90 degrees to the direction of grate movement) at the middle position of the top of the first flue 203 furnace roof 204. When the gate 1207 is lifted and opened, the wet sludge entering the gate feeder 12 located at the top of the incinerator 200 furnace 204 enters the cavity 1206, and then passes through the cavity 1206 to reach the valve body outlet 1213 position and falls out. When passing through the bottom outlet of the installation groove 17, it is dispersed and atomized by the compressed air, and the sludge enters the incinerator 200. The wet sludge falls from the first flue 203 to the front end of the secondary grate 201 of the incinerator 200 (i.e., the garbage combustion section of the incinerator 200) and is incinerated together with the garbage. During the falling process of the wet sludge into the first flue 203 of the incinerator 200, it is baked by the high-temperature flame and flue gas (temperature above 1000°C). Due to the large height difference between the furnace top 204 and the secondary grate 201, the wet sludge stays in the high-temperature flame and flue gas for a slightly longer time (≥2S). After being heated, part of the moisture in the wet sludge evaporates, and the moisture content of the remaining wet sludge solids is reduced. It is mixed with the garbage and incinerated together, reducing the impact on the garbage combustion in the combustion section.

[0069] (4) In step (2), the sludge flows from the furnace top 204 through the pipe of the second branch 1003 downward to the rear arch 205 of the incinerator 200. The wet sludge then passes through the maintenance gate valve 29 and the electric regulating valve 11 on the second branch 1003 in sequence, and enters a plurality of gates evenly distributed horizontally (at 90 degrees to the direction of grate movement) at the middle position of the top of the rear arch 205 between the tail section of the secondary grate 201 and the front section of the tertiary grate 202. In the feeder 12, the garbage enters the furnace of the incinerator 200 from the plug-in feeder 12 and falls to the front end of the three-stage grate 202 of the incinerator 200 (i.e., the garbage burning section of the incinerator 200). The garbage and slag from the second-stage grate 201 fall to the third-stage grate 202 and cover the sludge that falls to the third-stage grate 202. The sludge and garbage are incinerated together to form slag, which is discharged from the incinerator 200 into the slag pit. The wet sludge enters the incinerator. During the falling process in the furnace 200, the wet sludge is baked by the high-temperature flame and flue gas (temperature is 850℃-1100℃). Due to the small height difference from the rear arch 205 to the third-level grate 202, the wet sludge stays in the high-temperature flame and flue gas for a long time (<1S). After the wet sludge is heated, a small part of the water evaporates, and the moisture content of the remaining wet sludge solids is still relatively high. It falls to the front end of the third-level grate 202 (i.e., the garbage combustion section) and is mixed with the high-temperature garbage slag that is about to be burned. At this time, some garbage is still burning. The garbage and slag from the second-level grate 201 fall to the third-level grate 202 and will cover the falling sludge. Since the grate continues to reciprocate, the sludge is mixed with the high-temperature slag under the action of the reciprocating motion of the grate, absorbs the heat of the slag, evaporates the remaining water and burns with the garbage. The incinerated sludge eventually forms slag and is discharged from the incinerator 200 into the slag pit.

[0070] A maintenance gate valve 3 can also be provided on the main line 1001 of the conveying pipeline 10 of the present invention. A pressure transmitter 7 is provided on both the first branch 1002 and the second branch 1003. The sludge is transported on the first branch 1002 or the second branch 1003, first passes through the pressure transmitter 7 and then enters the gate feeder 12 to detect the sludge pushing pressure in the first branch 1002 and the second branch 1003 pipelines.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A system for incinerating wet sludge with domestic waste, characterized in that: The invention comprises a sludge storage unit (100), a sludge conveying unit, a sludge feeding unit and an incinerator (200); the sludge storage unit (100) is used to store wet sludge, and the sludge storage unit (100) and the sludge feeding unit are connected via the sludge conveying unit; the sludge feeding unit is provided with two groups, and the two groups of sludge feeding units are respectively provided on the furnace top (204) of the incinerator (200) and the rear arch (205) of the incinerator (200); The sludge feeding unit includes a plurality of insert plate feeders (12), and the plurality of insert plate feeders (12) of each sludge feeding unit are arranged in parallel horizontally. The insert plate feeders (12) are installed on the furnace wall of the incinerator (200), and a plurality of water-cooled wall pipes (16) are arranged in an array on the furnace wall. Adjacent water-cooled wall pipes (16) are connected by water-cooling fins (13), and the insert plate feeders (12) are installed on the water-cooling fins (13); The water-cooling fin (13) is provided with a mounting groove (17), the mounting groove (17) is V-shaped, the plate feeder (12) is installed in the mounting groove (17), a gas pipeline (18) is provided on the groove wall of the mounting groove (17), one end of the gas pipeline (18) is connected to the compressed gas supply device, and the other end of the gas pipeline (18) is provided with a gas injection port, and the gas injection port is provided at the bottom of the mounting groove (17); The insert plate feeder (12) comprises a hydraulic cylinder (1201), an intermediate bracket (1202) and a feeding valve body (1203), wherein the hydraulic cylinder (1201) is mounted on the top surface of the intermediate bracket (1202), the feeding valve body (1203) is connected to the bottom surface of the intermediate bracket (1202), the bottom of the feeding valve body (1203) is mounted in the mounting groove (17), a water cooling assembly (1209) is provided at the lower portion of the feeding valve body (1203), the water cooling assembly (1209) comprises a water cooling cavity, the water cooling cavity is welded to the feeding valve body (1203), a cooling water inlet (1212) and a cooling water outlet (1211) are provided on the water cooling cavity, and the cooling water inlet (1212) and the cooling water outlet (1211) are respectively connected to a cooling water circulation pipe (1214); A plug plate (1207) is provided in the intermediate bracket (1202), the piston rod end of the hydraulic oil cylinder (1201) is connected to the plug plate (1207), a cavity (1206) is provided in the feeding valve body (1203), the cross-sectional shape of the cavity (1206) is adapted to the cross-sectional shape of the plug plate (1207), a valve body feed port (1210) is provided in the middle of the feeding valve body (1203), a valve body discharge port (1213) is provided at the bottom of the feeding valve body (1203), the shape of the valve body discharge port (1213) is adapted to the cross-sectional shape of the plug plate (1207), a blanking hole is correspondingly provided on the water-cooling fin (13), and a notch is correspondingly provided at the bottom of the mounting groove (17); A heat-insulating material (19) is poured on the water-cooled wall pipe (16), and the heat-insulating material (19) wraps the installation groove (17); and a heat-insulating plate (20) is provided on the cooling water circulation pipe (1214).

2. A wet sludge co-combustion process, characterized in that: A domestic waste co-incineration wet sludge system as described in claim 1 is used.

3. The wet sludge co-combustion process according to claim 2, characterized in that: The following steps are involved: (1) The transport vehicle transports the wet sludge to the sludge storage unit (100); (2) The sludge conveying unit conveys the wet sludge from the sludge storage unit (100) to two groups of sludge feeding units respectively; (3) The wet sludge entering the sludge feeding unit provided at the top (204) of the incinerator (200) in step (2) enters the first flue (203) of the incinerator (200) from the sludge feeding unit, and then falls from the first flue (203) to the front end of the secondary grate (201) of the incinerator (200) to be incinerated in conjunction with the garbage; (4) The sludge entering the sludge feeding unit provided at the rear arch (205) of the incinerator (200) in step (2) enters the furnace of the incinerator (200) from the sludge feeding unit and falls to the front end of the third-stage grate (202) of the incinerator (200). The garbage and slag on the second-stage grate (201) fall to the third-stage grate (202) and cover the sludge falling to the third-stage grate (202). The sludge and garbage are incinerated in combination to eventually form slag, which is discharged from the incinerator (200) into the slag pit.

4. The wet sludge co-combustion process according to claim 3, characterized in that: The sludge conveying unit comprises a conveying pipeline (10), a hydraulic cone valve plunger pump (6), a cage-type impurity remover (8), a pressure transmitter (7), a second maintenance gate valve (9) and an electric regulating valve (11); the conveying pipeline (10) comprises a main line (1001), a first branch line (1002) and a second branch line (1003); the hydraulic cone valve plunger pump (6), the cage-type impurity remover (8) and the pressure transmitter (7) are arranged on the main line (1001); the hydraulic cone valve plunger pump (6) is arranged on the sludge The storage unit (100) is disposed at the discharge end of the cage-type impurity remover (8), and the cage-type impurity remover (8) is disposed at the discharge end of the hydraulic cone valve plunger pump (6). The feed end and the discharge end of the cage-type impurity remover (8) are both provided with a pressure transmitter (7). The first branch (1002) and the second branch (1003) are both provided with the second maintenance gate valve (9) and the electric regulating valve (11), respectively. The electric regulating valve (11) is disposed at the front end of the sludge feeding unit, and the second maintenance gate valve (9) is disposed at the front end of the electric regulating valve (11).

5. The wet sludge co-combustion process according to claim 4, characterized in that: In step (2), the pushing pressure of the wet sludge in the conveying pipe (10) is increased to 2.5-5 MPa by the hydraulic cone valve plunger pump (6).

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