Efficient energy-saving system in titanium dioxide production process

Abstract

The utility model relates to an efficient energy-saving system in a titanium dioxide production process, which is characterized in that an inlet of a high-temperature bag filter is connected with a steam powder high-temperature tail gas pipe, an outlet of the high-temperature bag filter is connected with a heat transfer pipe, and two branch pipes connected onto the heat transfer pipe are respectively connected into medium inlets of a first heat exchanger and a second heat exchanger; a water inlet of the desalted water preparation system is connected with a freezing water return pipe, a water outlet pipe of the desalted water preparation system is connected with a water inlet of a slag cooler, a water outlet of the slag cooler is connected with a water inlet in the lower portion of a second heat exchanger, and a water outlet of the second heat exchanger is connected with a third-washing hot water bucket. The tail end of the heat transfer pipe is connected to a secondary spray tower, an overflow port is arranged below an air inlet of the secondary spray tower, and the overflow port is respectively connected to a primary washing hot water bucket and a secondary washing hot water bucket through overflow pipes. By means of efficient waste heat recycling and water reutilization of the system, consumption of water and steam is reduced, energy consumption of titanium dioxide production is reduced, and therefore efficient energy-saving production of titanium dioxide is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to titanium dioxide production field, concretely relates to a kind of efficient energy-saving system in the production process of titanium dioxide. BACKGROUND

[0002] At present, in the production system of sulfuric acid method titanium dioxide, the water consumption of acidolysis, calcination cold slag machine, three washing processes of post-treatment is large, and the water quality requirements are different, and the water consumption is high. There are many problems at present: one, a large amount of concentrated water is generated in the preparation process of desalted water, and the water reuse rate is low;Two, sand filter water is used for heat exchange of cold slag machine, and the equipment is seriously scaled, with high cleaning cost;Three, the waste heat reuse of post-treatment steam powder is not sufficient: the outlet temperature of steam powder high-temperature bag filter is about 150℃, in order to utilize the waste heat carried by steam powder machine exhaust steam, various heat exchangers are usually used for indirect heat exchange, or desalted water is sprayed for direct heat exchange to absorb waste heat. In order to solve the problems of high water consumption, steam consumption and large waste heat emission of titanium dioxide, the cold water, desalted water preparation, cold slag machine, steam powder high-temperature tail gas and heating heat exchange are combined into an energy-saving production system, so as to further reduce the production cost of titanium dioxide. The present application is designed for this situation. SUMMARY

[0003] The utility model discloses a kind of efficient energy-saving systems in the production process of titanium dioxide, which avoids the deficiencies of prior art.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows: an efficient energy-saving system in the production process of titanium dioxide, comprising a desalted water preparation system, a cold slag machine and a high-temperature bag filter, characterized by: the inlet of the high-temperature bag filter is connected to a steam powder high-temperature tail gas pipe, the outlet of the high-temperature bag filter is connected to a heat transfer pipe, a No. 1 branch pipe connected to the heat transfer pipe is connected to the medium inlet of a No. 1 heat exchanger, a No. 2 branch pipe connected to the heat transfer pipe is connected to the medium inlet of a No. 2 heat exchanger, and the medium outlets of the No. 1 heat exchanger and the No. 2 heat exchanger are both connected to the heat transfer pipe.

[0005] A backwater branch pipe is connected to the backwater pipe of the heating system, the backwater branch pipe is connected to the water inlet at the lower part of the No. 1 heat exchanger, and the water outlet pipe at the upper part of the No. 1 heat exchanger is connected to the heating backwater pipe.

[0006] The water inlet of the desalted water preparation system is connected to a cold backwater pipe, the water outlet pipe of the desalted water preparation system is connected to the water inlet of the cold slag machine, the water outlet of the cold slag machine is connected to the water inlet at the lower part of the No. 2 heat exchanger through a low-temperature desalted water pipe, and the water outlet at the upper part of the No. 2 heat exchanger is connected to the three-washing hot water bucket through a hot desalted water pipe.

[0007] The heat pipe end accesses the air inlet of the lower part of the secondary spray tower, the air outlet of the upper part of the secondary spray tower connects the air inlet of the primary spray tower through a hot gas pipe, and the air outlet of the primary spray tower accesses the exhaust system through a fan; the secondary spray tower air inlet is provided with an overflow port, and the overflow port is connected to a first hot water washing tank and a second hot water washing tank through an overflow pipe.

[0008] The concentrated water pipe of the desalted water preparation system is connected to the acidolysis leaching water tank and the circulating water pool.

[0009] The primary spray tower water inlet is connected to a new water pipe, and the circulating spray water outlet of the lower part of the primary spray tower is connected to the new water pipe through a No. 3 pump; the water outlet of the primary spray tower is connected to a circulating pipe through a No. 1 pump, and the circulating pipe is connected to the water inlet of the secondary spray tower; the circulating spray water outlet of the lower part of the secondary spray tower is connected to the circulating pipe through a No. 2 pump.

[0010] The high-temperature bag filter outlet is provided with a dust instrument for real-time monitoring of dust conditions.

[0011] The No. 1 branch pipe and the No. 2 branch pipe are both provided with air valves; the backwater branch pipe and the low-temperature desalted water pipe are both provided with regulating valves; the water outlet pipe and the hot desalted water pipe are both provided with thermometers, and the opening degree of the regulating valve can be controlled according to the required temperature.

[0012] The new water pipe is provided with a No. 2 electric valve, the bottom of the primary spray tower is provided with a liquid level meter, and the liquid level meter is interlocked with the No. 2 electric valve for control. The No. 2 electric valve is turned on and off by high and low liquid levels.

[0013] The bottom of the primary spray tower is provided with a thermometer, and the thermometer is interlocked with the No. 3 pump and the No. 1 pump for control.

[0014] A bypass port is arranged between the air inlet and the overflow port of the secondary spray tower, the bypass port is connected to the overflow pipe through a bypass pipe; the air inlet of the secondary spray tower is 500-1000 mm away from the bypass port, and the bypass port is 1000-2000 mm away from the overflow port, so as to prevent spray water from entering the heat pipe.

[0015] A No. 1 electric valve is arranged on the overflow pipe; the bottom of the secondary spray tower is provided with a thermometer, and the thermometer is interlocked with the No. 2 pump and the No. 1 electric valve for control.

[0016] The condensate water pipes at the bottoms of the No. 1 heat exchanger and the No. 2 heat exchanger are both connected to a central water washing tank.

[0017] The utility model discloses a beneficial effect is: system design is simple and reasonable, convenient operation. The concentrated water of desalted water preparation produces gets reuse, has reduced the unit product water consumption of titanium dioxide production. The refrigeration return water is used for desalted water preparation, has reduced the steam consumption of raw water heating in winter desalted water preparation process. Cold desalted water is used for the material cooling of cold slag machine first, then enters the heat exchange of no. 2 heat exchanger and is used for three washings washing, has improved the water reusability, has reduced the steam consumption of desalted water heating, prolongs the service life of cold slag machine simultaneously. The waste heat of steam powder high temperature tail gas is recovered to the plant area heating system, has reduced the steam consumption of plant area heating. The remaining waste heat in high temperature tail gas is fully absorbed after two stage spraying, and the new water is used for washing after heating, reduces the steam consumption of washing water heating of first washing, second washing, further improves the recovery efficiency of steam powder high temperature tail gas waste heat. The dust instrument is provided at the outlet of high temperature bag filter, helps real time monitoring bag filter condition, can prevent bag filter breakage, pollutes water quality and material loss. Through the efficient waste heat reuse of system, the water reusability reduces the water, steam consumption, reduces titanium dioxide production energy consumption, thereby realizes titanium dioxide efficient energy -saving production. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the schematic diagram of the utility model;

[0019] In the drawing: 1 - desalted water preparation system, 2 - cold slag machine, 3 - high temperature bag filter, 4 - no. 1 heat exchanger, 5 - no. 2 heat exchanger, 6 - first stage spray tower, 7 - second stage spray tower, 8 - first washing hot water bucket, 9 - second washing hot water bucket, 10 - third washing hot water bucket, 11 - fan, P1 - no. 1 pump, P2 - no. 2 pump, P3 - no. 3 pump;L - new water pipe, L1 - circulating pipe, L2 - overflow pipe, L3 - bypass pipe;B - heat pipe, B1 - no. 1 branch pipe, B2 - no. 2 branch pipe, B3 - hot gas pipe;R - heating return water pipe, R1 - return water branch pipe, R2 - outlet pipe, R3 - low temperature desalted water pipe, R4 - hot desalted water pipe;N - concentrated water pipe;F1 - no. 1 electric valve, F2 - no. 2 electric valve. DETAILED DESCRIPTION

[0020] See Figure 1 A kind of efficient energy -saving system in the production process of titanium dioxide, including desalted water preparation system 1, cold slag machine 2, high temperature bag filter 3, it is characterized in that: the inlet of high temperature bag filter 3 is connected with steam powder high temperature tail gas pipe, the outlet of high temperature bag filter 3 is connected with heat pipe B, the medium inlet of no. 1 heat exchanger 4 is accessed by the connection of no. 1 branch pipe B1 on heat pipe B, the medium inlet of no. 2 heat exchanger 5 is accessed by the connection of no. 2 branch pipe B2 on heat pipe B, and the medium outlet of no. 1 heat exchanger 4 and no. 2 heat exchanger 5 are all connected with heat pipe B.

[0021] The return water pipe R of the heating system is connected with a return water branch pipe R1, the return water branch pipe R1 is connected with the water inlet of the lower part of the first heat exchanger 4, and the water outlet pipe R2 of the upper part of the first heat exchanger 4 is connected with the return water pipe R of the heating system;

[0022] The water inlet of the desalted water preparation system 1 is connected with the return water pipe of the refrigeration system, the water outlet pipe of the desalted water preparation system 1 is connected with the water inlet of the cold slag machine 2, the water outlet of the cold slag machine 2 is connected with the water inlet of the lower part of the second heat exchanger 5 through the low-temperature desalted water pipe R3, and the water outlet of the upper part of the second heat exchanger 5 is connected with the hot water bucket 10 for three times of washing through the hot desalted water pipe R4.

[0023] The end of the heat transfer pipe B is connected with the air inlet of the lower part of the second spray tower 7, the air outlet of the upper part of the second spray tower 7 is connected with the air inlet of the first spray tower 6 through the hot gas pipe B3, and the exhaust port of the first spray tower 6 is connected with the exhaust system through the fan 11; the air inlet of the lower part of the second spray tower 7 is provided with an overflow port, and the overflow port is connected with the hot water bucket 8 for one time of washing and the hot water bucket 9 for two times of washing through the overflow pipe L2.

[0024] The concentrated water pipe N of the desalted water preparation system 1 is connected with the acidolysis and leaching water tank and the circulating water pool.

[0025] The water inlet of the first spray tower 6 is connected with the new water pipe L, the circulating spray water outlet of the lower part of the first spray tower 6 is connected with the new water pipe L through the third pump P3, the water outlet of the first spray tower 6 is connected with the circulating pipe L1 through the first pump P1, the circulating pipe L1 is connected with the water inlet of the second spray tower 7, and the circulating spray water outlet of the lower part of the second spray tower 7 is connected with the circulating pipe L1 through the second pump P2.

[0026] The outlet of the high-temperature bag filter 3 is provided with a dust instrument for monitoring the dust condition in real time.

[0027] The first branch pipe B1 and the second branch pipe B2 are both provided with air valves, the return water branch pipe R1 and the low-temperature desalted water pipe R3 are both provided with adjusting valves, and the water outlet pipe R2 and the hot desalted water pipe R4 are both provided with thermometers, so that the opening degree of the adjusting valve can be controlled according to the required temperature.

[0028] The new water pipe L is provided with the second electric valve F2, the bottom of the first spray tower 6 is provided with a liquid level meter, and the liquid level meter is connected with the second electric valve F2 in interlocking control. The second electric valve F2 is switched on and off by controlling the high and low liquid levels.

[0029] The bottom of the first spray tower 6 is provided with a thermometer, and the thermometer is connected with the third pump P3 and the first pump P1 in interlocking control.

[0030] The bypass opening is connected with the overflow pipe L2 through a bypass pipe L3; the inlet of the secondary spray tower 7 is 500-1000 mm away from the bypass opening, and the bypass opening is 1000-2000 mm away from the overflow opening, preventing the spray water from entering the heat transfer pipe B.

[0031] The overflow pipe L2 is provided with a first electric valve F1; the bottom of the secondary spray tower 7 is provided with a thermometer, and the thermometer is interlocked with the second pump P2 and the first electric valve F1.

[0032] The condensate pipes at the bottom of the first heat exchanger 4 and the second heat exchanger 5 are connected to a central water washing tank.

[0033] Working process:

[0034] The chilled backwater from the crude titanium dioxide production and freezing crystallization process enters the desalted water preparation system 1 to prepare desalted water, and the prepared desalted water enters the cold slag machine 2 to cool the crude titanium dioxide of about 1000℃ from the rotary kiln; the concentrated water generated in the water preparation process of the desalted water preparation system 1 is recycled to the acidolysis leaching water tank and the circulating water pool through the concentrated water pipe N.

[0035] The high-temperature tail gas generated in the titanium dioxide steam powder process is filtered and dusted through the high-temperature bag filter 3, enters the first heat exchanger 4 through a first branch pipe B1 of the heat transfer pipe B, the heating backwater enters the first heat exchanger 4 through a backwater branch pipe R1 of the heating backwater pipe R, the high-temperature tail gas and the heating backwater are exchanged after entering the heat transfer pipe B, and the heating backwater is exchanged and enters the heating backwater pipe R through the outlet pipe R2.

[0036] Meanwhile, the high-temperature tail gas enters the second heat exchanger 5 through a second branch pipe B2, the low-temperature desalted water after heat exchange in the cold slag machine 2 enters the second heat exchanger 5 through a low-temperature desalted water pipe R3, the low-temperature desalted water after heat exchange enters the three-washing hot water bucket 10 through a hot desalted water pipe R4; the high-temperature tail gas and the low-temperature desalted water are exchanged and enter the secondary spray tower 7 and the primary spray tower 6 through the heat transfer pipe B after the gradient spray recovery of waste heat, and are emptied through the fan 11.

[0037] The new water enters the primary spray tower 6 for water replenishment through a new water pipe L, the third pump P3 circulates and sprays the water in the primary spray tower 6, when the water temperature in the primary spray tower 6 reaches the set value, the first pump P1 starts to pump the water to the secondary spray tower 7 through a circulating pipe L1 for further spray heat exchange; when the water temperature in the secondary spray tower 7 is lower than the set value, the second pump P2 starts to circulate and spray; when the water temperature in the secondary spray tower 7 exceeds the set value, the first electric valve F1 is opened, and the hot water is sent to the first washing hot water bucket 8 and the second washing hot water bucket 9 through the overflow pipe L2 at the bottom of the secondary spray tower 7.

Claims

1. An efficient energy-saving system in a titanium dioxide production process, comprising a desalted water preparation system (1), a cold slag machine (2), and a high-temperature bag filter (3), characterized in that: The inlet of the high-temperature bag filter (3) is connected with a powder high-temperature tail gas pipe, and the outlet of the high-temperature bag filter (3) is connected with a heat transfer pipe (B), a first branch pipe (B1) connected with the heat transfer pipe (B) is connected with a medium inlet of a first heat exchanger (4), a second branch pipe (B2) connected with the heat transfer pipe (B) is connected with a medium inlet of a second heat exchanger (5), and the medium outlets of the first heat exchanger (4) and the second heat exchanger (5) are both connected with the heat transfer pipe (B); A return water branch pipe (R1) is connected with a return water pipe (R) of the heating system, the return water branch pipe (R1) is connected with a water inlet at a lower part of the first heat exchanger (4), and a water outlet pipe (R2) at an upper part of the first heat exchanger (4) is connected with the return water pipe (R) of the heating system. A water inlet of a desalination water preparation system (1) is connected with a frozen return water pipe, a water outlet pipe of the desalination water preparation system (1) is connected with a water inlet of a slag cooler (2), a water outlet of the slag cooler (2) is connected with a water inlet at a lower part of the second heat exchanger (5) through a low-temperature desalination water pipe (R3), and a water outlet at an upper part of the second heat exchanger (5) is connected with a three-washing hot water bucket (10) through a hot desalination water pipe (R4). A terminal end of the heat transfer pipe (B) is connected with an air inlet at a lower part of a second spray tower (7), an air outlet at an upper part of the second spray tower (7) is connected with an air inlet of a first spray tower (6) through a hot gas pipe (B3), and an air outlet of the first spray tower (6) is connected with a discharge system through a fan (11); an overflow port is arranged below the air inlet of the second spray tower (7), and the overflow port is connected with a first washing hot water bucket (8) and a second washing hot water bucket (9) through an overflow pipe (L2).

2. The energy-efficient system in a titanium dioxide production process according to claim 1, characterized in that: A concentrated water pipe (N) of the desalination water preparation system (1) is connected with an acidolysis leaching water tank and a circulating water pool.

3. The energy-efficient system for titanium dioxide production according to claim 1, characterized in that: A water inlet of the first spray tower (6) is connected with a new water pipe (L), a circulating spray water outlet at a lower part of the first spray tower (6) is connected with the new water pipe (L) through a third pump (P3), a water outlet of the first spray tower (6) is connected with a circulating pipe (L1) through a first pump (P1), and the circulating pipe (L1) is connected with a water inlet of the second spray tower (7); a circulating spray water outlet at a lower part of the second spray tower (7) is connected with the circulating pipe (L1) through a second pump (P2).

4. The energy-efficient system for titanium dioxide production according to claim 1, characterized in that: The outlet of the high-temperature bag filter (3) is provided with a dust instrument for monitoring dust in real time.

5. The energy-efficient system for titanium dioxide production according to claim 1, characterized in that: A wind valve is arranged on each of the first branch pipe (B1) and the second branch pipe (B2); an adjusting valve is arranged on each of the return water branch pipe (R1) and the low-temperature desalination water pipe (R3); and a thermometer is arranged on each of the water outlet pipe (R2) and the hot desalination water pipe (R4), so that the opening degree of the adjusting valve can be controlled according to the required temperature.

6. The energy-efficient system for titanium dioxide production according to claim 3, characterized in that: A second electric valve (F2) is arranged on the new water pipe (L), a liquid level meter is arranged at a bottom of the first spray tower (6), and the liquid level meter is connected with the second electric valve (F2) in interlocking control.

7. The energy-efficient system for titanium dioxide production according to claim 1, characterized in that: A thermometer is arranged at the bottom of the first spray tower (6), and the thermometer is connected with the third pump (P3) and the first pump (P1) in interlocking control.

8. The energy-efficient system for titanium dioxide production according to claim 1, characterized in that: The bypass opening is connected with the overflow pipe (L2) through a bypass pipe (L3); the air inlet of the secondary spray tower (7) is 500mm-1000mm away from the bypass opening, and the bypass opening is 1000mm-2000mm away from the overflow opening, preventing the spray water from entering the heat transfer pipe (B).

9. The energy-efficient system for titanium dioxide production according to claim 1, characterized in that: A first electric valve (F1) is arranged on the overflow pipe (L2); a thermometer is arranged at the bottom of the secondary spray tower (7), and the thermometer is in interlocking control with the second pump (P2) and the first electric valve (F1).

10. The energy-efficient system for titanium dioxide production according to claim 1, characterized in that: The condensate pipes at the bottoms of the first heat exchanger (4) and the second heat exchanger (5) are connected with a central water washing tank.

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