Waste heat recycling device for multiple unfreezing warehouses

Abstract

The utility model relates to the field of blast furnace smelting material unfreezing in winter in metallurgical industry, in particular to a multi-unfreezing-warehouse waste heat recycling device which comprises a flue gas furnace and an air mixing chamber communicated with an air outlet of the flue gas furnace, and the air mixing chamber is respectively connected with an auxiliary unfreezing warehouse and a main unfreezing warehouse through a plurality of parallel air inlet pipelines. Induced draft fans are arranged on the multiple air inlet pipelines, hot air is conveyed into the auxiliary unfreezing storehouses and the main unfreezing storehouses through the induced draft fans, waste heat of the auxiliary unfreezing storehouses and the main unfreezing storehouses enters the flue gas circulating pipelines through waste gas valves, the flow is controlled through waste gas adjusting valves, and the waste heat enters the auxiliary unfreezing storehouses and the main unfreezing storehouses again through the induced draft fans. And cyclic utilization of waste heat is achieved. According to the utility model, single-unfreezing-warehouse operation or simultaneous operation of multiple unfreezing warehouses can be carried out according to requirements, and the system has the advantages of improving waste heat recovery efficiency, realizing balance of heat supply and demand, reducing unit energy consumption, enhancing system stability, improving production efficiency and flexibility, optimizing space utilization and reducing operation and maintenance cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the metallurgical industry winter blast furnace smelting material thawing field, especially relate to a kind of multi-thawing library waste heat recycling device. BACKGROUND

[0002] The material required by blast furnace smelting is generally transported by train, and the material is prone to freeze into blocks during winter transportation due to the moisture contained therein. When the material is unloaded at the unloading point using a dumper, the frozen material is difficult to unload, and the frozen large blocks are prone to block the unloading funnel, affecting the continuous and stable production of winter material unloading. Therefore, most metallurgical enterprises in the north are equipped with thawing warehouses for thawing materials.

[0003] Although the gas medium required for thawing the material in the thawing warehouse is not high in temperature, the required flow is large, so the blast furnace gas consumption is large. With the tightening of the national "carbon emission" index, it is urgent to reduce energy consumption in each process of smelting enterprises, and it is an urgent task to reduce the blast furnace thawing warehouse gas consumption and recycle the waste gas waste heat in actual production.

[0004] The waste heat recovery of multi-thawing warehouse usually uses simple heat exchangers or waste heat recovery devices, but the design and layout of these devices are often not optimized, resulting in low waste heat recovery efficiency. The waste heat generated by multi-thawing warehouse is intermittent and volatile, and the waste heat demand (such as heating, heat preservation, etc.) is usually continuous and stable. The existing technology lacks effective heat regulation and storage mechanism, resulting in mismatch between heat supply and demand. UTILITY MODEL CONTENTS

[0005] In order to solve at least one of the above problems, the utility model provides a multi-thawing warehouse waste heat recycling device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A multi-thawing warehouse waste heat recycling device, comprising a flue gas furnace, a mixed air chamber communicating with the gas outlet of the flue gas furnace, a plurality of parallel arranged thawing warehouses connected by a plurality of parallel air inlet pipelines respectively, and a flue gas circulation pipeline provided in the plurality of parallel arranged thawing warehouses.

[0008] Preferably, a chimney is provided on the mixed air chamber, and a mixed air valve is provided on the pipeline of the chimney, for controlling the flow of air entering the mixed air chamber.

[0009] Preferably, the air inlet pipeline is sequentially connected by an induced draft fan inlet pipeline, an induced draft fan and an induced draft fan outlet pipeline; the air inlet of the induced draft fan is connected with the mixed air chamber through the induced draft fan inlet pipeline, the air outlet of the induced draft fan is connected with the thawing warehouse through the induced draft fan outlet pipeline, and the hot gas is delivered to the thawing warehouse through the induced draft fan.

[0010] Further preferably, the inlet pipe of the induced draft fan is provided with a hot air valve, which is used to adjust the flow of mixed gas (mixed gas of flue gas from the flue gas furnace and air from the chimney) entering the induced draft fan, and can cut off the passage of another group of induced draft fans corresponding to the same flue gas furnace to prevent reverse suction.

[0011] Preferably, the thawing warehouse comprises one main thawing warehouse and multiple auxiliary thawing warehouses.

[0012] Further preferably, the number of auxiliary thawing warehouses is 1-3.

[0013] Preferably, the flue gas circulation pipe comprises a flue gas circulation main pipe, a flue gas circulation auxiliary pipe and a flue gas circulation branch pipe. The flue gas circulation main pipe is arranged at the top end of the main thawing warehouse, one end of which is connected with the main thawing warehouse, and the other end is connected with the induced draft fan inlet pipe of the air inlet pipe of the main thawing warehouse. The flue gas circulation auxiliary pipe is arranged at the top end of the auxiliary thawing warehouse, one end of which is connected with the auxiliary thawing warehouse, and the other end is connected with the flue gas circulation main pipe. The flue gas circulation branch pipe is arranged at the end of the flue gas circulation main pipe close to the induced draft fan, and is connected with the induced draft fan inlet pipe of the air inlet pipe of the auxiliary thawing warehouse.

[0014] Further preferably, the end of the flue gas circulation auxiliary pipe close to the auxiliary thawing warehouse and the end of the flue gas circulation main pipe close to the main thawing warehouse are both provided with a waste gas valve, which is located before the joint of the flue gas circulation main pipe and the flue gas circulation auxiliary pipe. The waste gas valve is used to block the waste gas of the two groups of thawing warehouses.

[0015] Further preferably, a waste gas adjusting valve is arranged on the end of the flue gas circulation main pipe close to the induced draft fan and the flue gas circulation branch pipe.

[0016] Further preferably, the waste gas adjusting valve on the flue gas circulation branch pipe is arranged at the end close to the flue gas circulation main pipe. The waste gas adjusting valve is used to adjust the flow of waste gas recovered from the thawing warehouse, so as to balance the sum of the flow of flue gas from the flue gas furnace and the flow of air from the chimney with the rated air volume of the fan.

[0017] Further preferably, the waste gas valve and the waste gas adjusting valve are both electric valves with manual devices.

[0018] Preferably, the multi-thawing warehouse waste heat recycling device is further provided with a blowdown valve for removing water vapor in the waste gas.

[0019] Preferably, the blowdown valve is arranged at the bottom of the induced draft fan shell.

[0020] Preferably, the thawing warehouse roof top two ends are also respectively provided with a diffusion, and a diffusion valve is additionally provided on the diffusion, the diffusion is closed to block the diffusion when the thawing warehouse normally works, the exhaust valve and the exhaust regulating valve are closed and the diffusion valve is opened when abnormal conditions occur, and the production process before the transformation can be restored.

[0021] The three gas sources of the air induction fan inlet are flue gas of high furnace gas combustion in the flue gas furnace, air input through the air mixing valve on the chimney and exhaust gas recovered through the exhaust valve, and the three gas sources are controlled by regulating valves, so that the flow of each path can be balanced by adjusting the valve opening, and then the process requirements of controllable flue gas furnace hearth negative pressure, reduced low-temperature air addition flow, appropriate exhaust gas recovery, strict control of the mixed gas temperature at the air induction fan inlet and balanced air induction fan inlet and outlet flow can be met.

[0022] Compared with the prior art, the application has the following beneficial effects:

[0023] (1) According to the utility model, the pipeline and valve are additionally arranged on the opening of the thawing warehouse roof top, the exhaust gas is recovered and input to the air induction fan inlet for recycling, so that the addition flow of low-temperature air (winter ambient temperature) is greatly reduced, and the exhaust gas (temperature is about 60 DEG C) recovered for recycling is replaced, according to the principle of energy conservation, the high furnace gas flow required for the flue gas furnace of the thawing warehouse is greatly reduced, and the target of recycling the waste heat of the thawing warehouse exhaust gas and reducing the consumption of high furnace gas is achieved.

[0024] (2) The utility model recovers the waste heat of the thawing warehouse exhaust gas for recycling, realizes the self-circulation thawing production process, and reduces the consumption of high furnace gas of the flue gas furnace of the thawing warehouse.

[0025] (3) The utility model additionally arranges the valve on the diffusion of the thawing warehouse roof top two ends to block, if abnormal conditions occur, only the exhaust valve and the exhaust regulating valve need to be closed, and the diffusion valve is opened, and the thawing production process can be restored, so that the reliability of the two processes of the thawing system in parallel standby is greatly improved.

[0026] (4) The utility model can realize the simultaneous operation of multiple thawing warehouses, and the simultaneous operation of multiple thawing warehouses has obvious advantages in the multi-thawing warehouse waste heat recycling device, including improving waste heat recovery efficiency, realizing heat supply and demand balance, reducing unit energy consumption, enhancing system stability, improving production efficiency and flexibility, optimizing space utilization, and reducing operation and maintenance cost. These advantages make the multi-thawing warehouse waste heat recycling device have wide application prospects in energy saving and environmental protection, economic benefits and operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of the multi-thawing warehouse waste heat recycling device of the utility model;

[0028] Figure 2This is a schematic diagram of an existing blast furnace thawing storage area.

[0029] Figure Labels

[0030] 1. No. 1 flue gas furnace; 2. No. 1 mixing chamber; 3. No. 1 hot air valve; 4. No. 2 hot air valve; 5. No. 1 induced draft fan inlet pipe; 6. No. 2 induced draft fan inlet pipe; 7. No. 1 induced draft fan; 8. No. 2 induced draft fan; 9. No. 1 induced draft fan outlet pipe; 10. No. 2 induced draft fan outlet pipe; 11. No. 1 chimney; 12. No. 1 mixing valve; 13. Auxiliary thawing chamber; 14. Main thawing chamber; 15. 16. Vent valve #1; 17. Vent valve #4; 18. Warehouse door #2; 19. Vent valve #1; 20. Exhaust gas valve #1; 21. Exhaust gas valve #2; 22. Main flue gas circulation pipeline; 23. Exhaust gas regulating valve #1; 24. Exhaust gas regulating valve #2; 25. Branch flue gas circulation pipeline; 26. Secondary flue gas circulation pipeline; 27. Sewage discharge valve #1; 28. Sewage discharge valve #2. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0032] like Figure 1 As shown, a typical thawing system consists of two sets of flue gas furnaces corresponding to two thawing chambers. Fans #1 and #2 correspond to flue gas furnace #1, while fans #3 and #4 correspond to flue gas furnace #2 (flue gas furnace #2 and its associated fans are not shown in the diagram; they are arranged symmetrically with those of flue gas furnace #1). Fans #1 and #4 serve as backups for each other in their respective thawing chambers, as do fans #2 and #3. A train track is installed in the center of the floor inside each thawing chamber. Hot air branch pipes are horizontally arranged outside the track (the outlet pipes of the induced draft fans are connected to the hot air branch pipes). Nozzles are evenly distributed on the branch pipes, with the nozzles tilted upwards and aimed at the bottom side of the train car (not shown in the diagram).

[0033] Example 1

[0034] like Figure 1 As shown, this utility model provides a waste heat recycling device for multiple thawing chambers, including a No. 1 flue gas furnace 1, a No. 1 mixing chamber 2 connected to the outlet of the No. 1 flue gas furnace 1, the No. 1 mixing chamber 2 is connected to the auxiliary thawing chamber 13 and the main thawing chamber 14 respectively through two parallel air inlet pipes, and a No. 1 induced draft fan 7 and a No. 2 induced draft fan 8 are respectively installed on the two air inlet pipes, and the hot air is transported to the auxiliary thawing chamber 13 and the main thawing chamber 14 through the No. 1 induced draft fan 7 and the No. 2 induced draft fan 8.

[0035] The waste heat of the auxiliary thawing warehouse 13 and the main thawing warehouse 14 enters the flue gas circulation pipeline through a 1# exhaust gas valve 20 and a 2# exhaust gas valve 21 respectively, and then enters the auxiliary thawing warehouse 13 and the main thawing warehouse 14 again through a 1# induced draft fan 7 and a 2# induced draft fan 8, so as to realize the recycling of waste heat.

[0036] Specifically, a 1# chimney 11 is arranged on the 1# air mixing chamber 2, and a 1# air mixing valve 12 is arranged on the pipeline of the 1# chimney 11, which is used to control the flow of air entering the air mixing chamber.

[0037] The air inlet pipeline is sequentially connected by an induced draft fan inlet pipeline, an induced draft fan and an induced draft fan outlet pipeline. Specifically, the air inlet of the 1# induced draft fan 7 is connected with the 1# air mixing chamber 2 through the 1# induced draft fan inlet pipeline 5, and a 1# hot air valve 3 is arranged on the 1# induced draft fan inlet pipeline 5; the air outlet of the 1# induced draft fan 7 is connected with the auxiliary thawing warehouse 13 through the 1# induced draft fan outlet pipeline 9; at the same time, the 1# air mixing chamber 2 is connected with the 2# induced draft fan 8 through the 2# induced draft fan inlet pipeline 6, and a 2# hot air valve 4 is arranged on the pipeline; the 2# induced draft fan 8 is connected with the main thawing warehouse 14 through the 2# induced draft fan outlet pipeline 10.

[0038] Specifically, a 1# diffusion 15 and a 2# diffusion (not shown) are arranged at the two ends of the top of the auxiliary thawing warehouse 13, and a 4# diffusion 16 and a 3# diffusion (not shown) are arranged at the two ends of the top of the main thawing warehouse 14.

[0039] Specifically, the flue gas circulation pipeline includes a flue gas circulation auxiliary pipeline 26, a flue gas circulation main pipeline 22 and a flue gas circulation branch pipeline 25. The flue gas circulation main pipeline 22 is arranged at the top end of the main thawing warehouse 14, one end of which is connected with the main thawing warehouse 14, and the other end is connected with the 2# induced draft fan inlet pipeline 6; the flue gas circulation auxiliary pipeline 26 is arranged at the top end of the auxiliary thawing warehouse 13, one end of which is connected with the auxiliary thawing warehouse 13, and the other end is connected with the flue gas circulation main pipeline 22; the flue gas circulation branch pipeline 25 is arranged on the hole of the end of the flue gas circulation main pipeline 22 close to the induced draft fan, and the flue gas circulation branch pipeline 25 is connected with the 1# induced draft fan inlet pipeline 5.

[0040] Specifically, the flue gas circulation auxiliary pipeline 26 is provided with a 1# exhaust gas valve 20 at the end close to the auxiliary thawing warehouse 13, and the flue gas circulation main pipeline 22 is provided with a 2# exhaust gas valve 21 at the end close to the main thawing warehouse 14, and the 2# exhaust gas valve 21 is located before the joint of the flue gas circulation main pipeline 22 and the flue gas circulation auxiliary pipeline 26.

[0041] Specifically, the 2# exhaust gas regulating valve 24 is arranged at the end of the 2# induced draft fan 8 after the connection of the flue gas circulation main pipeline 22 and the flue gas circulation branch pipeline 25; and the 1# exhaust gas regulating valve 23 is arranged at the end of the flue gas circulation branch pipeline 25 close to the connection with the flue gas circulation main pipeline 22. During the operation of the thawing warehouse, the temperature and pressure in the pipeline change to affect the volume, and the exhaust gas regulating valve can regulate the flow to keep the flow balance.

[0042] Specifically, the 1# exhaust gas valve 20, the 2# exhaust gas valve 21, the 1# exhaust gas regulating valve 23 and the 2# exhaust gas regulating valve 24 are electric valves with manual devices.

[0043] As shown in the drawings, the 1# exhaust gas valve 20, the 2# exhaust gas valve 21, the 1# exhaust gas regulating valve 23 and the 2# exhaust gas regulating valve 24 are electric valves with manual devices. Figure 1 As shown in the drawings, the 1# exhaust gas valve 20, the 2# exhaust gas valve 21, the 1# exhaust gas regulating valve 23 and the 2# exhaust gas regulating valve 24 are electric valves with manual devices.

[0044] Specifically, the 1# exhaust gas valve 20, the 2# exhaust gas valve 21, the 1# exhaust gas regulating valve 23 and the 2# exhaust gas regulating valve 24 are electric valves with manual devices.

[0045] The working principle of the multi-thawing warehouse waste heat recycling device is as follows:

[0046] 1) 1 thawing warehouse works:

[0047] When not thawing, the 1# flue gas furnace 1 uses coke oven gas (not shown in the figure) to maintain a long-lasting fire, the 1# hot air valve 3 and the 2# hot air valve 4 are in the closed position, the 1# exhaust gas valve 20, the 2# exhaust gas valve 21 and the 1# exhaust gas regulating valve 23, the 2# exhaust gas regulating valve 24 are in the closed position, the 1# induced draft fan 7 and the 2# induced draft fan 8 are in the stop position, the 1# mixed air valve 12 on the 1# chimney 11 is in the open position, and the 1# flue gas furnace is in the heat preservation state.

[0048] When the main thawing plant 14 thawing production, frozen materials by train through the 2# gate 17 into the main thawing plant 14, train locomotive away, the car with material left in the thawing plant, close 2# gate 17. Open 1# flue gas furnace 1 blast furnace gas valve (not shown in the figure) and adjust the opening, open 2# induced draft fan 8, open 2# exhaust valve 21, adjust 2# hot blast valve 4 opening, adjust 1# air mixing valve 12 opening, adjust 2# exhaust valve 24 opening, reach 2# induced draft fan 8 inlet and outlet flow balance, so under the suction of 2# induced draft fan 8, 1# flue gas furnace 1 in the blast furnace gas combustion generated 800 ℃ ~ 950 ℃ high temperature flue gas, with the air through 1# chimney 11 and 1# air mixing valve 12 into the 1# air mixing chamber 2, and then with the 2# exhaust valve 21 and 2# exhaust gas from the main thawing plant 14 library waste gas forming no more than 150 ℃ mixed gas, and input main thawing plant 14 in the hot air branch, through forced heat transfer to the car skin material thawing, thawing production during the thawing plant library temperature generally remains at 70 ℃ ~ 80 ℃, the exhaust gas through the main thawing plant 14 library top 2# exhaust valve 21 and 2# exhaust gas regulating valve 24 again into 2# induced draft fan 8 inlet recycling. The process through 1# chimney 11 and 1# air mixing valve 12 of low temperature air (winter ambient temperature) flow will be greatly reduced (basically zero), instead of by recycling waste gas (temperature at about 60 ℃) replacement. According to the principle of conservation of energy, 1# flue gas furnace 1 combustion required blast furnace gas flow will be greatly reduced, so as to realize the recycling of thawing plant waste heat, reduce the blast furnace gas consumption. The water vapor contained in the recovered thawing plant exhaust gas, through 2# blowdown valve 28 discharge, under normal circumstances, blowdown valve for the constant closing position, only need to open valve blowdown in the induced draft fan stop state, to avoid the adverse effects on the impeller rust. Thawing process such as abnormal conditions only need to close 2# exhaust valve 21 and 2# exhaust gas regulating valve 24, and open 3# and 4# diffusion valve 19, can restore the thawing production process before the transformation, so as to greatly improve the reliability of the thawing system two kinds of technology parallel standby.

[0049] When the auxiliary thawing warehouse 13 is thawing, open the blast furnace gas valve (not shown in the figure) of the 1# smoke furnace 1 and adjust the opening, open the 1# induced draft fan 7, open the 1# exhaust valve 20, adjust the opening of the 1# hot air valve 3, adjust the opening of the 1# air mixing valve 12, adjust the opening of the 1# exhaust adjusting valve 23, and balance the flow at the inlet and outlet of the 1# induced draft fan 7. In this way, under the suction of the 1# induced draft fan 7, the high-temperature flue gas of 800℃-950℃ generated by the combustion of blast furnace gas in the 1# smoke furnace 1 is mixed with the air entering through the 1# chimney 11 and the 1# air mixing valve 12 in the 1# air mixing chamber 2, and then forms a mixed gas with a temperature not higher than 150℃ with the exhaust gas from the auxiliary thawing warehouse 13 through the 1# exhaust valve 20 and the 1# exhaust adjusting valve 23, and is input into the hot air branch pipe in the auxiliary thawing warehouse 13. Through forced heat transfer, the materials in the car are thawed. During the thawing production, the temperature in the thawing warehouse is generally maintained at 70℃-80℃, and the exhaust gas is recycled through the 1# exhaust valve 20 and the 1# exhaust adjusting valve 23 on the top of the auxiliary thawing warehouse 13 and then enters the inlet of the 1# induced draft fan 7. The water vapor contained in the recovered thawing warehouse exhaust gas is discharged through the 1# blowdown valve 27. Generally, the blowdown valve is in the normal closed position, and only needs to be opened for blowdown under the condition that the induced draft fan is stopped to avoid rusting the impeller and other adverse effects. If abnormal conditions occur during the thawing process, only need to close the 1# exhaust valve 20 and the 1# exhaust adjusting valve 23, and open the 1# blowdown valve 18 and the 2# blowdown valve, the thawing production process before the modification can be restored, thereby greatly improving the reliability of the two processes of the thawing system.

[0050] 2) Two thawing warehouses work at the same time:

[0051] The auxiliary thawing warehouse 13 and the main thawing warehouse 14 thaw simultaneously, the blast furnace gas valve (not shown in the figure) of the 1# flue gas furnace 1 is opened and the opening degree is adjusted, the 1# induced draft fan 7 and the 2# induced draft fan 8 are opened, the 1# waste gas valve 20 and the 2# waste gas valve 21 are opened and the opening degrees of the 1# hot air valve 3 and the 2# hot air valve 4 are adjusted, the opening degree of the 1# air mixing valve 12 is adjusted, the opening degrees of the 1# waste gas adjusting valve 23 and the 2# waste gas adjusting valve 24 are adjusted, the flow balance of the inlet and outlet of the 1# induced draft fan 7 and the flow balance of the inlet and outlet of the 2# induced draft fan 8 are achieved, thus under the suction of the 1# induced draft fan 7, the 800℃-950℃ high-temperature flue gas generated by the blast furnace gas combustion in the 1# flue gas furnace 1 mixes with the air entering through the 1# chimney 11 and the 1# air mixing valve 12 in the 1# air mixing chamber 2, then forms the mixed gas not higher than 150℃ with the waste gas from the auxiliary thawing warehouse 13 in the warehouse through the 1# waste gas valve 20 and the 1# waste gas adjusting valve 23, and inputs the hot air branch pipe in the auxiliary thawing warehouse 13, and the material in the car is thawed through forced heat transfer, the temperature in the thawing warehouse is generally kept at 70℃-80℃ during the thawing production period, and the waste gas enters the 1# induced draft fan 7 inlet again through the 1# waste gas valve 20 and the 1# waste gas adjusting valve 23 on the top of the auxiliary thawing warehouse 13 for recycling; under the suction of the 2# induced draft fan 8, the 800℃-950℃ high-temperature flue gas generated by the blast furnace gas combustion in the 1# flue gas furnace 1 mixes with the air entering through the 1# chimney 11 and the 1# air mixing valve 12 in the 1# air mixing chamber 2, then forms the mixed gas not higher than 150℃ with the waste gas from the main thawing warehouse 14 in the warehouse through the 2# waste gas valve 21 and the 2# waste gas adjusting valve 24, and inputs the hot air branch pipe in the main thawing warehouse 14, and the material in the car is thawed through forced heat transfer, the temperature in the thawing warehouse is generally kept at 70℃-80℃ during the thawing production period, and the waste gas enters the 2# induced draft fan 8 inlet again through the 2# waste gas valve 21 and the 2# waste gas adjusting valve 24 on the top of the main thawing warehouse 14 for recycling. The water vapor contained in the recovered thawing warehouse waste gas is discharged through the 1# blowdown valve 27 and the 2# blowdown valve 28 respectively, under normal circumstances, the blowdown valve is always closed, only needs to be opened for blowdown in the state of stopping the induced draft fan to avoid the adverse effects such as rusting on the impeller of the induced draft fan. If abnormal conditions occur during the thawing process, the 1# waste gas valve 20, the 2# waste gas valve 21, the 1# waste gas adjusting valve 23 and the 2# waste gas adjusting valve 24 are closed, and the 1# blowdown valve 18, the 2# blowdown valve and the 3# blowdown valve, the 4# blowdown valve 19 are opened, the thawing production process before the modification can be restored, thereby the reliability of the two processes of the thawing system in parallel standby is greatly improved.

[0052] Comparative Example 1

[0053] As Figure 2As shown, the existing blast furnace thawing warehouse device, including 1# flue gas furnace 1, and 1# flue gas furnace 1 with the outlet communication 1# mixed air chamber 2, 1# mixed air chamber 2 through two parallel gas pipeline respectively with the auxiliary thawing warehouse 13 and main thawing warehouse 14 connection, two gas pipeline respectively set up 1# induced draft fan 7 and 2# induced draft fan 8, through 1# induced draft fan 7 and 2# induced draft fan 8 will hot air delivery into auxiliary thawing warehouse 13 and main thawing warehouse 14.

[0054] Specifically, 1# mixed air chamber 2 is provided with 1# chimney 11, 1# chimney 11 is provided with 1# mixed air valve 12 on the pipeline, 1# mixed air valve 12 is used for controlling the flow of air into 1# mixed air chamber 2.

[0055] The gas pipeline is sequentially connected by induced draft fan inlet pipeline, induced draft fan and induced draft fan outlet pipeline. Specifically, 1# induced draft fan 7 air inlet is connected with 1# mixed air chamber 2 through 1# induced draft fan inlet pipeline 5, and 1# hot air valve 3 is arranged on 1# induced draft fan inlet pipeline 5, 1# induced draft fan 7 air outlet is connected with auxiliary thawing warehouse 13 through 1# induced draft fan outlet pipeline 9; At the same time, 1# mixed air chamber 2 is connected with 2# induced draft fan 8 through 2# induced draft fan inlet pipeline 6, and 2# hot air valve 4 is arranged on the pipeline; 2# induced draft fan 8 is connected with main thawing warehouse 14 through 2# induced draft fan outlet pipeline 10.

[0056] Specifically, 1# diffusion 15 and 2# diffusion (not drawn) are respectively arranged at both ends of the top of auxiliary thawing warehouse 13, and 4# diffusion 16 and 3# diffusion (not drawn) are respectively arranged at both ends of the top of main thawing warehouse 14.

[0057] The process flow of the blast furnace thawing warehouse (taking No. 1 flue gas furnace, No. 1 induced draft fan and the main thawing warehouse 14 as an example) is as follows: when the production is not thawed, the No. 1 flue gas furnace 1 keeps a long-lasting fire by using coke oven gas (not shown in the figure), the No. 1 hot blast valve 3 and the No. 2 hot blast valve 4 are in the closed position, the No. 1 induced draft fan 7 and the No. 2 induced draft fan 8 are in the stopped position, the No. 1 air mixing valve 12 on the No. 1 chimney 11 is in the open position, and the No. 1 flue gas furnace 1 is in the heat preservation state. When the production is thawed, the frozen materials are sent into the main thawing warehouse 14 by the train through the No. 2 warehouse door 17, the train locomotive drives away, the car body loaded with the materials is left in the thawing warehouse, the No. 2 warehouse door 17 is closed, and the thawing is prepared. The blast furnace gas valve (not shown in the figure) of the No. 1 flue gas furnace 1 is opened and the opening degree is adjusted, the No. 2 induced draft fan 8 is opened, the opening degree of the No. 2 hot blast valve 4 is adjusted, and the opening degree of the No. 1 air mixing valve 12 is adjusted, so that under the suction of the No. 2 induced draft fan 8, the high-temperature flue gas of 800-950 DEG C generated by the combustion of the blast furnace gas in the No. 1 flue gas furnace 1 is mixed with the air entering through the No. 1 chimney 11 and the No. 1 air mixing valve 12 to form mixed gas not higher than 150 DEG C in the No. 1 air mixing chamber 2, and is input into the hot air branch pipe in the main thawing warehouse 14 to thaw the materials in the car body by forced heat transfer. During the thawing production, the temperature in the thawing warehouse is generally kept at 70-80 DEG C, and the waste gas is discharged into the atmosphere through the No. 3 diffusion (not shown in the figure) and the No. 4 diffusion 16 at the two ends of the top of the main thawing warehouse 14. After the thawing is completed within the specified time according to the material characteristics and the freezing degree, the No. 1 flue gas furnace 1 returns to the heat preservation state, the car body in the main thawing warehouse 14 is pulled away by the train locomotive and is sent to the car dumper for unloading, so that one thawing cycle is completed. The next batch of car bodies enters the thawing warehouse again, and the cycle is repeated.

[0058] Through the above comparison, it can be seen that the utility model can realize the simultaneous operation of multiple thawing warehouses, can improve the production efficiency and flexibility, optimize the space utilization, and reduce the operation and maintenance cost.

Claims

1. A multi-thawing library waste heat recycling device, characterized in that, The device comprises a flue gas furnace, a mixing chamber connected with the gas outlet of the flue gas furnace, a plurality of parallel arranged thawing warehouses connected with the mixing chamber through a plurality of parallel air inlet pipelines, and a flue gas circulation pipeline provided in the thawing warehouses and connected with the air inlet pipelines.

2. The multi-thawing library waste heat recycling device according to claim 1, characterized in that, A chimney is arranged on the mixing chamber, and a mixing valve is arranged on the chimney pipeline.

3. The multi-thawing library waste heat recycling device according to claim 2, characterized in that, The air inlet pipeline is sequentially connected by an induced draft fan inlet pipeline, an induced draft fan, and an induced draft fan outlet pipeline.

4. The multi-thawing library waste heat recycling device according to claim 2, characterized in that, The thawing warehouse comprises one main thawing warehouse and a plurality of auxiliary thawing warehouses.

5. The multi-thawing library waste heat recycling device according to claim 1, characterized in that, The flue gas circulation pipeline comprises a flue gas circulation main pipeline, a flue gas circulation auxiliary pipeline, and a flue gas circulation branch pipeline. The flue gas circulation main pipeline is arranged at the top end of the main thawing warehouse, and one end thereof is connected with the main thawing warehouse and the other end is connected with the induced draft fan inlet pipeline of the air inlet pipeline. The flue gas circulation auxiliary pipeline is arranged at the top end of the auxiliary thawing warehouse, and one end thereof is connected with the auxiliary thawing warehouse and the other end is connected with the flue gas circulation main pipeline.

6. The multi-thawing library waste heat recycling device according to claim 5, characterized in that, The flue gas circulation branch pipeline is arranged at the end of the flue gas circulation main pipeline close to the induced draft fan.

7. The multi-thawing library waste heat recycling device according to claim 5, characterized in that, The flue gas circulation auxiliary pipeline and the flue gas circulation main pipeline are respectively provided with a waste gas valve at the end close to the auxiliary thawing warehouse and the end close to the main thawing warehouse.

8. The multi-thawing library waste heat recycling device according to claim 6, characterized in that, A waste gas regulating valve is arranged on the flue gas circulation main pipeline and the flue gas circulation branch pipeline.

9. The multi-thawing library waste heat recycling device according to claim 7, characterized in that, The waste gas valve is an electric valve with a manual device.

10. The multi-thawing library waste heat recycling device according to claim 1, characterized in that, The waste gas regulating valve is an electric valve with a manual device.

11. The multi-thawing library waste heat recycling device according to claim 1, characterized in that, The device is further provided with a blowdown valve arranged at the bottom of the induced draft fan shell. The thawing warehouse is further provided with a diffuser at each end of the top of the thawing warehouse, and a diffuser valve is arranged on the diffuser.

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