Novel flue gas desulfurization and deacidification device

Abstract

The utility model discloses a novel flue gas desulfurization and deacidification device. The device comprises a desulfurizing tower, a slurry supplementing box and a slurry box, a smoke inlet is formed in one side of the desulfurizing tower, a smoke outlet is formed in the top of the desulfurizing tower, a slurry pond is arranged in the lower end of the desulfurizing tower, a discharging pump and a first circulating pump are connected to one side of the slurry pond, and the first circulating pump is connected with a first spraying pipe; the slurry supplementing box is connected with a liquid supplementing pump through a fourth electric actuator, the liquid supplementing pump is connected with a first spraying pipe, the slurry box is connected with a second spraying pipe, a packing layer and a water collecting tray are sequentially arranged on the lower side of the second spraying pipe, and the water collecting tray is connected with the slurry box. According to the utility model, when slurry in the slurry tank is replaced, the flue gas can still be subjected to desulfurization and deacidification treatment; the third heat exchanger is used for heating the injected new slurry, so that the temperature of the slurry injected into the desulfurization tower is prevented from being too low; the treated flue gas is heated by the fed flue gas in the fourth heat exchanger, so that the phenomenon of white smoke caused by low temperature after treatment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a novel flue gas desulfurization and deacidification device. Background Art

[0002] The flue gas generated by the combustion devices in waste incineration, thermal power generation, smelting and other occasions contains more harmful gases, such as HCl, SO2, HF and other acidic gases. In order to make the acidic gas components in the flue gas reach the allowable emission standards, the corresponding flue gas treatment system is generally configured, and the flue gas desulfurization and deacidification device is one of them. There are three basic treatment processes for desulfurization and deacidification: dry method, semi-dry method and wet method, among which the wet method has the highest removal efficiency. The existing desulfurization and deacidification devices have the following defects: 1. The slurry in the slurry pool needs to be replaced regularly. During the replacement period, the desulfurization and denitrification device cannot continue to be put into use; 2. The temperature of the slurry injected during the replacement is too low, and the temperature inside the desulfurization and deacidification device is relatively high. Direct injection is likely to cause greater stress on the device shell; 3. The temperature of the flue gas after treatment is generally 60~70℃, and "white smoke" will emerge at the chimney outlet. Utility Model Content

[0003] The utility model aims to provide a novel flue gas desulfurization and deacidification device in view of the deficiencies in the prior art.

[0004] To achieve the above-mentioned objectives, the utility model provides a novel flue gas desulfurization and deacidification device, comprising a desulfurization tower, a slurry replenishing box and a slurry box, a smoke inlet is provided on one side of the desulfurization tower, and a smoke outlet is provided on the top thereof, a slurry pool is provided inside the lower end of the desulfurization tower, one side of the slurry pool is connected to a discharge pump and a first circulation pump through a first electric actuator and a second electric actuator, the outlet of the first circulation pump is connected to a first spray pipe through a third electric actuator, a first heat exchanger and a first one-way valve, the first spray pipe is arranged in the desulfurization tower above the smoke inlet, the slurry replenishing box is connected to a replenishing pump through a fourth electric actuator, the replenishing pump is connected to the first spray pipe through a fifth electric actuator and a second one-way valve, the slurry tank is connected to a second spray pipe through a sixth electric actuator, a second circulation pump, a seventh electric actuator and a second heat exchanger, a packing layer and a water collecting tray are provided on the lower side of the second spray pipe in sequence, the water collecting tray is arranged on the upper side of the first spray pipe, and the water collecting tray is connected to the slurry tank.

[0005] Furthermore, the eighth electric actuator, the third heat exchanger and the ninth electric actuator are connected between the seventh electric actuator and the second heat exchanger, and the fifth electric actuator and the second one-way valve are both connected to the third heat exchanger.

[0006] Furthermore, the seventh electric actuator is also connected to one end of the tenth electric actuator, and the other end of the tenth electric actuator is connected to the second heat exchanger.

[0007] Furthermore, a fourth heat exchanger is provided between the smoke outlet and the second spray pipe, and the fourth heat exchanger is connected to the smoke inlet pipe and the smoke inlet respectively.

[0008] Furthermore, a first demister is provided between the first spray pipe and the water collecting tray.

[0009] Furthermore, a second demister is provided between the second spray pipe and the fourth heat exchanger.

[0010] Furthermore, the outlet of the second circulation pump is also connected to a discharge pipe, and an eleventh electric actuator is provided on the discharge pipe.

[0011] Furthermore, a liquid level meter is provided on the desulfurization tower outside the slurry pool.

[0012] Beneficial effects: When the utility model replaces the slurry in the slurry pool, the first spray pipe can be kept in working condition, and the flue gas can still be desulfurized and deacidified; the injected replacement slurry is heated by the third heat exchanger to avoid the slurry injected into the desulfurization tower being too low in temperature; the treated flue gas is heated in the fourth heat exchanger by the sent flue gas to avoid the occurrence of white smoke due to the low temperature after treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a novel flue gas desulfurization and deacidification device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0014] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0015] like Figure 1As shown, the embodiment of the utility model provides a novel flue gas desulfurization and deacidification device, including a desulfurization tower 1, a slurry replenishing tank 2 and a slurry tank 3. Among them, a smoke inlet 101 is provided on one side of the desulfurization tower 1, and a smoke outlet 102 is provided on the top thereof. A slurry pool 103 is provided inside the lower end of the desulfurization tower 1. A first electric actuator 4 and a second electric actuator 5 are connected to one side of the slurry pool 103, and the first electric actuator 4 is connected to the discharge pump 6. When the first electric actuator 4 is turned on and the discharge pump 6 is started, the slurry in the slurry pool 103 can be discharged from the desulfurization tower 1. The second electric actuator 5 is connected to the first circulation pump 7, the outlet of the first circulation pump 7 is connected to the third electric actuator 8, the third electric actuator 8 is connected to the first heat exchanger 9, the first heat exchanger 9 is connected to the first one-way valve 10, and the first one-way valve 10 is connected to the first spray pipe 11. The first spray pipe 11 is arranged in the desulfurization tower 1 above the smoke inlet 101. When the second electric actuator 5 and the third electric actuator 8 are turned on and the first circulation pump 7 is started, the slurry in the slurry pool 103 can be pumped into the first heat exchanger 9 for cooling, and then sent into the first spray pipe 11 and sprayed out from the multiple nozzles on the first spray pipe 11. The sprayed slurry contacts the flue gas entering the desulfurization tower 1 to achieve the effect of desulfurization and deacidification. The above-mentioned slurry generally adopts limestone slurry, calcium hydroxide slurry, etc. The slurry to be replenished is pre-loaded in the slurry replenishment box 2. The slurry replenishment box 2 is connected to the replenishment pump 13 through the fourth electric actuator 12. The replenishment pump 13 is connected through the fifth electric actuator 14. The fifth electric actuator 14 is connected to the second one-way valve 15, and the second one-way valve 15 is connected to the first spray pipe 11. When the fourth electric actuator 12 and the fifth electric actuator 14 are turned on and the liquid replenishing pump 13 is turned on, the slurry stored in the slurry replenishing tank 2 can be pumped into the desulfurization tower 1, thereby realizing the slurry renewal. The slurry tank 3 is also pre-injected with slurry, and the slurry tank 3 is connected to the sixth electric actuator 16, the sixth electric actuator 16 is connected to the second circulation pump 17, the second circulation pump 17 is connected to the seventh electric actuator 18, the seventh electric actuator 18 is connected to the second heat exchanger 19, the second heat exchanger 19 is connected to the second spray pipe 20, and the lower side of the second spray pipe 20 is provided with a packing layer 21 and a water collecting pan 22 in sequence, the water collecting pan 22 is arranged on the upper side of the first spray pipe 11, and the water collecting pan 22 is connected to the slurry tank 3. When the sixth electric actuator 16 and the seventh electric actuator 18 are turned on and the second circulation pump 17 is started, the slurry in the slurry tank 3 can be pumped into the second heat exchanger 19 for cooling to avoid the slurry temperature being too high when being sent to the second spray pipe 20, and then sent to the second spray pipe 19, sprayed from the nozzle on the second spray pipe 19, contacted with the flue gas flowing through, and then desulfurized and deacidified to absorb the remaining small amount of harmful gas, and the slurry sprayed from the second spray pipe 19 falls on the water collecting tray 21 and flows back into the slurry tank 3. The first heat exchanger 9 and the second heat exchanger 19 can both exchange heat by passing cooling water.

[0016] In order to prevent the temperature of the slurry replenished from the slurry replenishment tank 2 from being too low, an eighth electric actuator 23, a third heat exchanger 24 and a ninth electric actuator 25 are connected between the seventh electric actuator 18 and the second heat exchanger 19, and the fifth electric actuator 14 and the second one-way valve 15 are both connected to the third heat exchanger 24. The slurry replenished from the slurry replenishment tank 2 exchanges heat with the solution pumped into the second spray pipe 19 in the third heat exchanger 24, thereby preheating the slurry replenished from the slurry replenishment tank 2.

[0017] The seventh electric actuator 18 is preferably connected to one end of the tenth electric actuator 26, and the other end of the tenth electric actuator 26 is connected to the second heat exchanger 19. The tenth electric actuator 26 is used as a bypass branch of the third heat exchanger 24. When the slurry is not replaced in the desulfurization tower 1, the tenth electric actuator 26 is controlled to be opened, and the eighth electric actuator 23 and the ninth electric actuator 25 are closed, thereby bypassing the third condenser 24. Before preparing to replace the slurry in the desulfurization tower 1, the tenth electric actuator 26 is closed in advance, and the eighth electric actuator 23 and the ninth electric actuator 25 are opened, so that the temperature in the third heat exchanger 24 is first increased.

[0018] In order to increase the temperature of the treated flue gas, a fourth heat exchanger 27 is provided between the smoke outlet 102 and the second spray pipe 20, and the fourth heat exchanger 27 is respectively connected to the smoke inlet pipe 28 and the smoke inlet 101. The smoke inlet pipe 28 is connected to the dust collector, and the smoke treated by the dust collector is sent into the desulfurization tower 1 through the smoke inlet pipe 28.

[0019] A first demister 29 is preferably provided between the first spray pipe 11 and the water collecting tray 22. A second demister 30 is provided between the second spray pipe 20 and the fourth heat exchanger 27 to remove mist droplets in the flue gas.

[0020] The slurry in the slurry tank 3 has a relatively longer effective use time than the solution in the slurry pool 103, but it may also fail. In order to facilitate the discharge of the failed slurry in the slurry tank 3, the outlet of the second circulation pump 17 is also connected to the discharge pipe, and the eleventh electric actuator 31 is provided on the discharge pipe. When the second circulation pump 17 is running, the seventh electric actuator 18 is closed and the eleventh electric actuator 31 is opened, so that the failed slurry can be discharged from the slurry tank 3. During the renewal of the slurry in the slurry tank 3, the second spray pipe 20 cannot continue to work. It should also be noted that the slurry replenishing tank 2 and the slurry tank 3 are connected with a refilling pipe, and the twelfth electric actuator 32 and the thirteenth electric actuator 33 are respectively provided on the refilling pipe. When the slurry is replenished from the outside to the slurry replenishing tank 2 and the slurry tank 3, the twelfth electric actuator 32 and the thirteenth electric actuator 33 are opened.

[0021] It is also preferred to set a liquid level meter 104 on the desulfurization tower 1 outside the slurry pool 103. When the slurry in the slurry pool 103 needs to be replaced, first open the first electric actuator 4 and start the discharge pump 6 to discharge the slurry in the slurry pool 103. During this period, the second electric actuator 5 and the third electric actuator 8 can still be controlled to open, and the first circulation pump 7 can be started to make the first spray pipe 11 in working state. At the same time, close the tenth electric actuator 26, open the eighth electric actuator 23 and the ninth electric actuator 25, so that the slurry in the slurry tank 3 flows through the third heat exchanger 24. When the liquid level feedback by the liquid level meter 104 drops to the lower limit threshold, control the first electric actuator 4, the second electric actuator 5 and the third electric actuator 8 to close, and control the discharge pump 6 and the first circulation pump 7 to stop running. At the same time, control the opening of the fourth electric actuator 12 and the fifth electric actuator 14, and start the replenishment pump 13 to achieve the replenishment of the replaced slurry after preheating. In the desulfurization tower 1, until the liquid level fed back by the liquid level meter 104 rises to the upper limit threshold, the fourth electric actuator 12 and the fifth electric actuator 14 are controlled to be closed, and the operation of the replenishing pump 13 is stopped, the second electric actuator 5 and the third electric actuator 8 are controlled to be opened, and the first circulation pump 7 is started, and then the tenth electric actuator 26 is opened, and the eighth electric actuator 23 and the ninth electric actuator 25 are closed. During this period, the second circulation pump 17 can always be kept in operation, and the sixth electric actuator 16 and the seventh electric actuator 18 are in the open state.

[0022] The above is only a preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this technical field, other parts not specifically described belong to the prior art or common knowledge. Under the premise of not departing from the principle of the utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A new type of flue gas desulfurization and deacidification device, characterized in that: It includes a desulfurization tower, a slurry replenishing tank and a slurry tank. A smoke inlet is provided on one side of the desulfurization tower, and a smoke outlet is provided on the top thereof. A slurry pool is provided inside the lower end of the desulfurization tower. A discharge pump and a first circulation pump are connected to one side of the slurry pool through a first electric actuator and a second electric actuator. The outlet of the first circulation pump is connected to a first spray pipe through a third electric actuator, a first heat exchanger and a first one-way valve. The first spray pipe is arranged in the desulfurization tower above the smoke inlet. The slurry replenishing tank is connected to a replenishing pump through a fourth electric actuator. The replenishing pump is connected to the first spray pipe through a fifth electric actuator and a second one-way valve. The slurry tank is connected to a second spray pipe through a sixth electric actuator, a second circulation pump, a seventh electric actuator and a second heat exchanger. A packing layer and a water collecting tray are provided on the lower side of the second spray pipe in sequence. The water collecting tray is arranged on the upper side of the first spray pipe, and the water collecting tray is connected to the slurry tank.

2. A novel flue gas desulfurization and deacidification device according to claim 1, characterized in that: The eighth electric actuator, the third heat exchanger and the ninth electric actuator are connected between the seventh electric actuator and the second heat exchanger, and the fifth electric actuator and the second one-way valve are both connected to the third heat exchanger.

3. A novel flue gas desulfurization and deacidification device according to claim 1, characterized in that: The seventh electric actuator is also connected to one end of the tenth electric actuator, and the other end of the tenth electric actuator is connected to the second heat exchanger.

4. A novel flue gas desulfurization and deacidification device according to claim 1, characterized in that: A fourth heat exchanger is provided between the smoke outlet and the second spray pipe, and the fourth heat exchanger is connected to the smoke inlet pipe and the smoke inlet respectively.

5. A novel flue gas desulfurization and deacidification device according to claim 1, characterized in that: A first demister is provided between the first spray pipe and the water collecting tray.

6. A novel flue gas desulfurization and deacidification device according to claim 4, characterized in that: A second demister is provided between the second spray pipe and the fourth heat exchanger.

7. A novel flue gas desulfurization and deacidification device according to claim 1, characterized in that: The outlet of the second circulation pump is also connected to a discharge pipe, and an eleventh electric actuator is arranged on the discharge pipe.

8. A novel flue gas desulfurization and deacidification device according to claim 1, characterized in that: A liquid level meter is provided on the desulfurization tower outside the slurry pool.

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