A desulfurization slurry injection device using unit extraction steam and its working method

Abstract

The invention discloses a desulfurization slurry ejection device using unit steam extraction and a working method thereof, comprising a tower body, a desulfurization slurry inlet pipe, a unit steam extraction inlet pipe and an ejector; the desulfurization slurry inlet pipe and the unit steam extraction inlet pipe extend into the tower body, and the ejector is located in the tower body; the ejector comprises a mixing chamber, a diffuser and a separation chamber, the front end of the mixing chamber is connected to the desulfurization slurry inlet pipe and the unit steam extraction inlet pipe, and the rear end is connected to the front end of the diffuser, the diffuser is a conical pipe, the front end diameter of the diffuser is smaller than the rear end diameter, and the rear end of the diffuser is connected to the separation chamber; the top of the separation chamber is provided with a steam outlet, and the bottom is provided with a desulfurization slurry outlet. The water in the desulfurization slurry can be discharged, and the heat carried by the water is used to recover the heat of the unit steam extraction.

Description

Technical Field

[0001] The invention belongs to the field of desulfurization slurry injection, and relates to a desulfurization slurry injection device utilizing unit extraction steam and a working method thereof. Background Art

[0002] Coal-fired thermal power plant heating is still the main heating method in winter in most parts of the north. Among them, the deep recovery and utilization of flue gas waste heat plays an important role in improving the heating capacity of thermal power plants and reducing heating energy consumption. At present, one of the common ways to recover flue gas waste heat is to install a flue gas heat exchanger in the flue to directly recover the flue gas waste heat of coal-fired power plants. After the flue gas is wet desulfurized, it contains a lot of water vapor, and its temperature is between 45 and 55°C. By making the flue gas directly contact with the flue gas heat exchanger, the temperature of the flue gas and the latent heat released by the condensation of water vapor are used to heat the hot network water in the flue gas heat exchanger, so as to realize the recovery and utilization of flue gas waste heat.

[0003] However, the flue gas itself has a low heat transfer coefficient and is corrosive, so the efficiency of waste heat recovery is low and the cost is high. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a desulfurization slurry ejection device and a working method thereof using unit extraction steam, which can discharge water in the desulfurization slurry and use the water to carry heat to recover the heat of the unit extraction steam.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A desulfurization slurry ejector device utilizing unit extraction steam comprises a tower body, a desulfurization slurry inlet pipe, a unit extraction steam inlet pipe and an ejector;

[0007] The desulfurization slurry inlet pipe and the unit extraction steam inlet pipe extend into the tower body, and the ejector is located in the tower body;

[0008] The ejector includes a mixing chamber, a diffuser and a separation chamber. The front end of the mixing chamber is connected to the desulfurization slurry inlet pipe and the unit extraction steam inlet pipe, and the rear end is connected to the front end of the diffuser. The diffuser is a conical tube. The front end diameter of the diffuser is smaller than the rear end diameter. The rear end of the diffuser is connected to the separation chamber. A steam outlet is provided at the top of the separation chamber, and a desulfurization slurry outlet is provided at the bottom.

[0009] Preferably, there are multiple ejectors, and the multiple ejectors are horizontally arranged in the tower body.

[0010] Furthermore, the mixing chamber of each ejector is connected to the desulfurization slurry inlet pipe and the unit steam extraction inlet pipe through a desulfurization slurry branch pipe and a unit steam extraction branch pipe, and the diameter of the unit steam extraction branch pipe is smaller than the diameter of the unit steam extraction inlet pipe.

[0011] Preferably, a demister is provided in the separation chamber, and the demister divides the separation chamber into two parts, an upper part and an lower part, and the rear end of the diffuser pipe and the outlet of the desulfurization slurry are both located below the demister.

[0012] Preferably, the desulfurization slurry inlet pipe is located above the unit's steam extraction inlet pipe.

[0013] Preferably, a desulfurization slurry outlet pipeline is provided at the bottom of the tower body, and a desulfurization slurry outlet pump is provided in the desulfurization slurry outlet pipeline.

[0014] Furthermore, the bottom of the tower body is in an inverted cone shape.

[0015] Preferably, the top of the tower body is connected to the hot end of a hot network water heater, and the cold end of the hot network water heater is connected to hot network water.

[0016] A working method of a desulfurization slurry ejector device using unit extraction steam based on any one of the above items comprises the following process:

[0017] The desulfurization slurry enters the desulfurization slurry inlet pipe, and the unit extraction steam enters the unit extraction steam inlet pipe. The desulfurization slurry and the unit extraction steam are collected in the mixing chamber. The high-speed flow rate of the unit extraction steam itself reduces the pressure in the mixing chamber. Under the induced action of the unit extraction steam in the mixing chamber, the desulfurization slurry enters the mixing chamber. On the one hand, the surrounding pressure is reduced, and on the other hand, the heat of the unit extraction steam is absorbed to evaporate the water in the desulfurization slurry. The water vapor and the desulfurization slurry enter the separation chamber along the diffuser pipe, where the water vapor is discharged from the steam outlet and the desulfurization slurry flows out from the desulfurization slurry outlet under the action of gravity.

[0018] Preferably, the water vapor enters the hot network water heater from the top of the tower body, condenses and releases heat to the hot network water, thereby heating the hot network water.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention reduces the pressure in the mixing chamber through the high-speed flow rate of the unit's extraction steam itself. Under the induced action of the unit's extraction steam in the mixing chamber, the desulfurization slurry absorbs the heat of the unit's extraction steam, and the water in the desulfurization slurry evaporates to form hot steam. The heat of the unit's extraction steam can be recovered by recovering the hot steam, thus avoiding various problems in flue gas heat recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0022] Figure 2 It is a top view of the ejection part of the present invention.

[0023] Among them: 1-tower body; 2-desulfurization slurry outlet pump; 3-desulfurization slurry inlet pipe; 4-desulfurization slurry header; 5-desulfurization slurry branch pipe; 6-unit extraction steam inlet pipe; 7-unit extraction steam header; 8-unit extraction steam branch pipe; 9-mixing chamber; 10-diffuser; 11-separation chamber; 12-demister; 13-steam outlet; 14-desulfurization slurry outlet; 15-heat network water heater. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0025] like Figure 1 As shown, the desulfurization slurry injection device using unit extraction steam of the present invention includes a tower body 1, a desulfurization slurry outlet pump 2, a desulfurization slurry inlet pipe 3, a desulfurization slurry header 4, a desulfurization slurry branch pipe 5, a unit extraction steam inlet pipe 6, a unit extraction steam header 7, a unit extraction steam branch pipe 8, a mixing chamber 9, a diffuser 10, a separation chamber 11, a demister 12, a steam outlet 13, a desulfurization slurry outlet 14 and a hot network water heater 15.

[0026] The desulfurization slurry inlet pipe 3 and the unit steam extraction inlet pipe 6 extend into the tower body 1, the desulfurization slurry inlet pipe 3 is located above the unit steam extraction inlet pipe 6, the front end of the mixing chamber 9 is connected to the desulfurization slurry inlet pipe 3 and the unit steam extraction inlet pipe 6, and the rear end is connected to the front end of the diffuser 10. The diffuser 10 is a conical tube, and the front end diameter of the diffuser 10 is smaller than the rear end diameter. The rear end of the diffuser 10 is connected to the separation chamber 11; the top of the separation chamber 11 is provided with a steam outlet 13, and the bottom is provided with a desulfurization slurry outlet 14.

[0027] A demister 12 is provided in the separation chamber 11 , and the demister 12 divides the separation chamber 11 into two parts, an upper part and an lower part. The rear end of the diffuser pipe 10 and the desulfurization slurry outlet 14 are both located below the demister 12 .

[0028] like Figure 2 As shown, there are multiple ejectors, which are horizontally arranged in the tower body 1. The desulfurization slurry inlet pipe 3 is connected to the desulfurization slurry header 4. The lower part of the desulfurization slurry header 4 is connected to multiple desulfurization slurry branch pipes 5. The desulfurization slurry branch pipes 5 are connected to the mixing chamber 9 along the radial direction of the mixing chamber 9. The unit extraction steam inlet pipe 6 is connected to the unit extraction steam header 7. The unit extraction steam header 7 is connected to multiple unit extraction steam branch pipes 8. The unit extraction steam branch pipes 8 are connected to the mixing chamber 9 along the axial direction of the mixing chamber 9. The diameter of the unit extraction steam branch pipe 8 is smaller than the diameter of the unit extraction steam inlet pipe 6 and the unit extraction steam header 7.

[0029] A desulfurization slurry outlet pipeline is arranged at the bottom of the tower body 1, and a desulfurization slurry outlet pump 2 is arranged in the desulfurization slurry outlet pipeline. The bottom of the tower body 1 is in an inverted cone shape.

[0030] The top of the tower body 1 is connected to the hot end of a hot network water heater 15 , and the cold end of the hot network water heater 15 is connected to hot network water.

[0031] The desulfurization slurry that has absorbed the sulfur, moisture and heat in the flue gas first enters the desulfurization slurry inlet pipe 3, and then enters the desulfurization slurry header 4. While flowing in the desulfurization slurry header 4, the desulfurization slurry is evenly distributed to each desulfurization slurry branch pipe 5, and enters the mixing chamber 9 of each ejector from each desulfurization slurry branch pipe 5. The unit extraction steam after work has a certain pressure and temperature. It enters the unit extraction steam header 7 from the unit extraction steam inlet pipe 6, and then is evenly distributed to each unit extraction steam branch pipe 8. The diameter of the unit extraction steam branch pipe 8 is smaller than the diameter of the unit extraction steam header 7 and the desulfurization slurry branch pipe 5. The unit extraction steam flows faster in the unit extraction steam branch pipe 8, and forms a high-speed airflow at the outlet from the unit extraction steam branch pipe 8 to the mixing chamber 9, reducing the pressure in the mixing chamber 9.

[0032] Under the induced action of the unit extraction steam in the mixing chamber 9, the desulfurized slurry enters the mixing chamber 9 from the desulfurized slurry branch pipe 5. On the one hand, the ambient pressure is reduced, and on the other hand, the heat of the unit extraction steam is absorbed, and the water in the desulfurized slurry evaporates. The water vapor and the desulfurized slurry enter the separation chamber 11 along the diffuser 10, wherein the water vapor enters the steam outlet 13 through the demister 12, and the desulfurized slurry enters the desulfurized slurry outlet 14 under the action of gravity and the blocking action of the demister 12, and is pumped out of the tower body 1 by the desulfurized slurry outlet pump 2 in the desulfurized slurry outlet pipeline.

[0033] The water vapor enters the heating network water heater 15, condenses and releases heat to supply water to the heating network for heating. The condensed water can be used for heating network water replenishment or unit water replenishment, thereby realizing the recycling of flue gas waste heat for daily heating.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A desulfurization slurry ejection device using unit extraction steam, characterized in that: It comprises a tower body (1), a desulfurization slurry inlet pipe (3), a unit extraction steam inlet pipe (6) and an ejector; The desulfurization slurry inlet pipe (3) and the unit extraction steam inlet pipe (6) extend into the tower body (1), and the ejector is located in the tower body (1); The ejector comprises a mixing chamber (9), a diffuser pipe (10) and a separation chamber (11); the front end of the mixing chamber (9) is connected to a desulfurized liquid inlet pipe (3) and a unit extraction steam inlet pipe (6), and the rear end is connected to the front end of the diffuser pipe (10); the diffuser pipe (10) is a conical pipe, the front end diameter of the diffuser pipe (10) is smaller than the rear end diameter thereof, and the rear end of the diffuser pipe (10) is connected to the separation chamber (11); the top of the separation chamber (11) is provided with a steam outlet (13), and the bottom is provided with a desulfurized liquid outlet (14); There are multiple ejectors, and the multiple ejectors are horizontally arranged in the tower body (1); The mixing chamber (9) of each ejector is connected to the desulfurization slurry inlet pipe (3) and the unit steam extraction inlet pipe (6) through a desulfurization slurry branch pipe (5) and a unit steam extraction branch pipe (8), and the diameter of the unit steam extraction branch pipe (8) is smaller than the diameter of the unit steam extraction inlet pipe (6); A demister (12) is arranged in the separation chamber (11), and the demister (12) divides the separation chamber (11) into two parts, an upper part and an lower part. The rear end of the diffuser pipe (10) and the desulfurized slurry outlet (14) are both located below the demister (12).

2. The desulfurization slurry injection device using unit extraction steam according to claim 1 is characterized in that: The desulfurization slurry inlet pipe (3) is located above the unit extraction steam inlet pipe (6).

3. The desulfurization slurry injection device using unit extraction steam according to claim 1 is characterized in that: A desulfurization slurry outlet pipeline is arranged at the bottom of the tower body (1), and a desulfurization slurry outlet pump (2) is arranged in the desulfurization slurry outlet pipeline.

4. The desulfurization slurry injection device using unit extraction steam according to claim 3 is characterized in that: The bottom of the tower body (1) is in an inverted cone shape.

5. The desulfurization slurry injection device using unit extraction steam according to claim 1, characterized in that: The top of the tower body (1) is connected to the hot end of a hot network water heater (15), and the cold end of the hot network water heater (15) is connected to hot network water.

6. A working method of the desulfurization slurry ejector device using unit extraction steam according to any one of claims 1 to 5, characterized in that: The process includes: The desulfurized slurry enters the desulfurized slurry inlet pipe (3), the unit extraction steam enters the unit extraction steam inlet pipe (6), and the desulfurized slurry and the unit extraction steam are collected in the mixing chamber (9). The high flow rate of the unit extraction steam itself reduces the pressure in the mixing chamber (9). Under the induced action of the unit extraction steam in the mixing chamber (9), the desulfurized slurry enters the mixing chamber (9), while the pressure of the surrounding environment is reduced, and the water in the desulfurized slurry evaporates while absorbing the heat of the unit extraction steam. The water vapor and the desulfurized slurry enter the separation chamber (11) along the diffuser pipe (10), wherein the water vapor is discharged from the steam outlet (13), and the desulfurized slurry flows out from the desulfurized slurry outlet (14) under the action of gravity.

7. The working method of the desulfurization slurry ejector device using unit extraction steam according to claim 6 is characterized in that: The water vapor enters the hot network water heater (15) from the top of the tower body (1), condenses and releases heat to the hot network water, thereby heating the hot network water.

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