Recycling device for steam condensation water of auxiliary engine of carbon black tail gas power generation steam turbine

Abstract

The utility model discloses a carbon black tail gas power generation steam turbine auxiliary machine steam condensation water recovery device which comprises a front steam seal, a rear steam seal and shaft seal heaters of a steam turbine, the front steam seal and the rear steam seal of the steam turbine comprise the shaft seal heaters, and the shaft seal heaters are further connected with a condensation water pump and a low-pressure heater together. The shaft seal heater is installed on the platform, the top of the shaft seal heater is connected with an exhaust port, the bottom of the shaft seal heater is connected with a drain pipe, the other end of the drain pipe is connected with a water seal cylinder, the water seal cylinder is further connected with a condensation recovery pipe, and the other end of the condensation recovery pipe is connected with a condenser. The shaft seal heater is lifted to a seven-meter platform, the height of the shaft seal heater is utilized, a seven-meter high water seal barrel is added, the height of the water seal barrel is utilized, the negative pressure of the condenser is overcome, first-stage condensate water and second-stage condensate water of the shaft seal heater are recycled into the condenser and used for water supply of a boiler, and the recycled condensate water has a certain temperature and can be recycled. And the use of fuel can be reduced when the device is used for boiler water supply.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine shaft seal heaters, in particular to a device for recovering steam condensate of auxiliary machine of carbon black tail gas power generation steam turbine. Background Art

[0002] The shaft seal heater is an indispensable auxiliary equipment during the operation of the steam turbine. During operation, it recovers the steam leakage from the front and rear steam seals of the steam turbine, heats the steam condensate of the steam turbine, and increases the condensate temperature. The shaft seal heater is divided into two stages of drainage. The mixture of steam leakage from the front and rear steam seals enters the first stage, and the new working steam enters the other stage. The steam heats the condensate of the steam turbine, condenses the steam into water, and sends it to the condenser.

[0003] The existing shaft seal heater is placed on a 3-meter platform. After the steam is condensed, it is recovered to the condenser using a serpentine water seal. Since the condenser is under negative pressure during operation, the serpentine water seal must overcome the negative pressure during operation of the condenser to recover the first and second level condensate of the shaft seal heater. During operation, it was found that the serpentine water seal could not overcome the negative pressure of the condenser and could not recover the first and second level steam condensate of the shaft seal heater, resulting in energy loss.

[0004] The existing shaft seal heater adds a steam trap on the pipeline sent to the condenser to recover the primary and secondary condensate of the shaft seal heater. Since the steam trap must be closely monitored during operation and is prone to leakage, adding a steam trap improves the maintenance and overhaul of power plant equipment.

[0005] The existing shaft seal heater adds a negative pressure fan at the exhaust port to recover the first and second level condensate of the seal heater. Adding the negative pressure fan will increase the power consumption of the power plant. At the same time, the negative pressure fan equipment will cause maintenance and overhaul of the power plant equipment. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a device for recovering steam condensate from the auxiliary equipment of a carbon black tail gas power generation steam turbine, which solves the problem that the existing serpentine water seal cannot overcome the negative pressure of the condenser and cannot recover the first and second stage steam condensate of the shaft seal heater, resulting in energy loss.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for recovering steam condensate from an auxiliary machine of a carbon black tail gas power generation steam turbine, comprising front and rear steam seals and a shaft seal heater of the steam turbine, wherein the front and rear steam seals of the steam turbine comprise a shaft seal heater, and the shaft seal heater is also connected to a condensate pump and a low-pressure heater; the shaft seal heater is installed on a platform, an exhaust port is connected to the top of the shaft seal heater, a drain pipe is connected to the bottom of the shaft seal heater, the other end of the drain pipe is connected to a water seal cylinder, a condensate recovery pipe is also connected to the water seal cylinder, and the other end of the condensate recovery pipe is connected to a condenser.

[0008] Preferably, the drain pipe also includes a first-level drain of the shaft seal heater and a second-level drain of the shaft seal heater, and the first-level drain of the shaft seal heater and the second-level drain of the shaft seal heater are both arranged at the bottom of the shaft seal heater; and the first-level drain of the shaft seal heater and the second-level drain of the shaft seal heater are inserted into the inner side of the water seal tube away from the other end of the shaft seal heater.

[0009] Preferably, the other end of the condensation recovery pipe on the water seal cylinder away from the secondary drain of the shaft seal heater is connected to an exhaust pipe, and the other end of the first drain of the shaft seal heater on the water seal cylinder away from the secondary drain of the shaft seal heater is connected to a water injection pipe.

[0010] Preferably, the water seal cylinder also includes a mirror, a water level gauge, a lifting groove and a float; a mirror is provided on the circumferential outer wall of the water seal cylinder, a water level gauge is provided on the water seal cylinder and one side of the mirror, a lifting groove is provided on the circumferential inner wall of the water seal cylinder, and a float is provided inside the lifting groove.

[0011] Preferably, the lifting groove further includes a water inlet; the lifting groove is provided with a water inlet, and the width of the water inlet is smaller than the width of the volume of the float.

[0012] Preferably, the platform height is set to seven meters.

[0013] Preferably, the height of the water seal cylinder is set to seven meters.

[0014] Preferably, the exhaust pipe, the first-level drain of the shaft seal heater and the second-level drain of the shaft seal heater, the condensate recovery pipe, the exhaust pipe and the water injection pipe are all provided with stop valves.

[0015] Compared with the existing technology, the utility model has the following beneficial effects: the utility model raises the shaft seal heater to a seven-meter platform, utilizes the height of the shaft seal heater, adds a seven-meter high water seal cylinder, utilizes the height of the water seal cylinder to overcome the negative pressure of the condenser, and recovers the first and second level condensate of the shaft seal heater into the condenser for use as boiler feed water. The recovered condensate has a certain temperature, and its use as boiler feed water can reduce fuel usage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the planar structure of the condensate recovery of the shaft seal heater in this application.

[0017] Figure 2 This is a schematic diagram of the planar structure of the water seal tube of this utility model.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner wall of the water seal cylinder of this utility model.

[0019] Markings in the figure: 1. Shaft seal heater, 2. Platform, 3. Exhaust port, 4. First-level drain of shaft seal heater, 5. Second-level drain of shaft seal heater, 6. Water seal cylinder, 61. Mirror, 62. Water level gauge, 63. Lifting tank, 6301, water inlet, 64. Float, 7. Condensate recovery pipe, 8. Condenser, 9. Stop valve, 10. Exhaust pipe, 11. Water injection pipe. DETAILED DESCRIPTION

[0020] like Figure 1-Figure 3 As shown; the utility model provides a technical solution: a device for recovering condensate of steam from auxiliary machine of carbon black tail gas power generation steam turbine, comprising front and rear steam seals of the steam turbine and a shaft seal heater 1, wherein the front and rear steam seals of the steam turbine comprise a shaft seal heater 1, and the shaft seal heater 1 is also connected with a condensate pump and a low-pressure heater; the shaft seal heater 1 is installed on a platform 2, the top of the shaft seal heater 1 is connected with an exhaust port 3, the bottom of the shaft seal heater 1 is connected with a drain pipe, the other end of the drain pipe is connected with a water seal cylinder 6, the water seal cylinder 6 is also connected with a condensate recovery pipe 7, and the other end of the condensate recovery pipe 7 is connected with a condenser 8; the steam of the steam turbine after doing work is condensed into water, and the condensate is sequentially input into the shaft seal heater 1 through the condensate pump, then by raising the shaft seal heater 1 to the seven-meter platform 2, the three-meter serpentine water seal is changed to a seven-meter straight water seal cylinder 6, and the shaft seal heater 1 is also in operation. Negative pressure is achieved by utilizing the height of the shaft seal heater 1 and the water seal cylinder 6 to overcome the negative pressure of the condenser 8, so that the condensate of the first-level drain 4 and the second-level drain 5 of the shaft seal heater 1 flows into the condenser 8 along the condensate recovery pipe 7, and the condensate of the first-level drain 4 and the second-level drain 5 of the shaft seal heater 1 is recovered, and the recovered condensate is used for the boiler, thereby solving the problem that the existing serpentine water seal cannot overcome the negative pressure of the condenser 8 and cannot achieve the first and second level steam condensate recovery of the shaft seal heater 1, causing energy loss; and the shaft seal heater 1 utilizes the leakage of the front and rear steam seals to heat the condensate that has done work in the turbine, which can not only recover the steam of the front and rear steam seals but also heat the condensate that has done work, thereby reducing the fuel usage, realizing the efficient utilization of energy, improving the power generation efficiency, and reducing the energy consumption of power generation.

[0021] Furthermore, the drain pipe also includes a first-level drain 4 of the shaft seal heater and a second-level drain 5 of the shaft seal heater, and the first-level drain 4 of the shaft seal heater and the second-level drain 5 of the shaft seal heater are both arranged at the bottom of the shaft seal heater 1; and the first-level drain 4 of the shaft seal heater and the second-level drain 5 of the shaft seal heater are inserted into the inner side of the water seal tube 6 away from the other end of the shaft seal heater 1.

[0022] Furthermore, the other end of the condensate recovery pipe 7 on the water seal cylinder 6 away from the secondary drain 5 of the shaft seal heater is connected to the exhaust pipe 10, and the other end of the primary drain 4 of the shaft seal heater on the water seal cylinder 6 away from the secondary drain 5 of the shaft seal heater is connected to the water injection pipe 11; when the first and second level steam condensate of the shaft seal heater 1 is recovered, the stop valves of the exhaust pipe 10 and the water injection pipe 11 are first opened, and water is injected into the water seal cylinder 6, and the water level in the water seal cylinder 6 gradually rises. At the same time, the water in the water seal cylinder 6 will be discharged from the water inlet 6301 of the lifting groove 63 It flows into the interior of the lifting groove 63, and as the water level in the water seal tube 6 continues to rise, it drives the float 64 in the lifting groove 63 to move upward. After the water level in the water seal tube 6 rises to a certain height, a water seal is formed. After the water seal is formed, the stop valves of the first-level drain 4 of the shaft seal heater and the second-level drain 5 of the shaft seal heater are opened to recover condensed water. At the same time, the float 64 moves upward along the lifting groove 63. The rising float 64 can be checked by the water level gauge 62, so as to know the height of the water level in the water seal tube 6.

[0023] Furthermore, the water seal cylinder 6 also includes a mirror 61, a water level gauge 62, a lifting groove 63 and a floating ball 64; a mirror 61 is provided on the circumferential outer wall of the water seal cylinder 6, a water level gauge 62 is provided on the water seal cylinder 6 and on one side of the mirror 61, a lifting groove 63 is provided on the circumferential inner wall of the water seal cylinder 6, and a floating ball 64 is provided on the inner side of the lifting groove 63.

[0024] Furthermore, the lifting groove 63 further includes a water inlet 6301 ; the lifting groove 63 is provided with a water inlet 6301 , and the width of the water inlet 6301 is smaller than the width of the volume of the float 64 .

[0025] Furthermore, the height of the platform 2 is set to seven meters.

[0026] Furthermore, the height of the water seal cylinder 6 is set to seven meters.

[0027] Furthermore, the exhaust port 3 pipeline, the first-level drain 4 of the shaft seal heater, the second-level drain 5 of the shaft seal heater, the condensate recovery pipe 7, the exhaust pipe 10 and the water injection pipe 11 are all provided with a stop valve 9.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention; the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for recovering condensed water from auxiliary steam of a carbon black tail gas power generation steam turbine, comprising front and rear steam seals of the steam turbine, characterized in that: The front and rear steam seals of the steam turbine include a shaft seal heater (1), which is also connected to a condensate pump and a low-pressure heater; the shaft seal heater (1) is installed on a platform (2), the top of the shaft seal heater (1) is connected to an exhaust port (3), the bottom of the shaft seal heater (1) is connected to a drain pipe, the other end of the drain pipe is connected to a water seal cylinder (6), the water seal cylinder (6) is also connected to a condensate recovery pipe (7), and the other end of the condensate recovery pipe (7) is connected to a condenser (8).

2. The device for recovering condensed water from auxiliary steam of a carbon black tail gas power generation steam turbine according to claim 1, characterized in that: The drain pipe further comprises a first-level drain (4) of the shaft seal heater and a second-level drain (5) of the shaft seal heater, and the first-level drain (4) of the shaft seal heater and the second-level drain (5) of the shaft seal heater are both arranged at the bottom of the shaft seal heater (1); and the first-level drain (4) of the shaft seal heater and the second-level drain (5) of the shaft seal heater are inserted into the inner side of the water seal tube (6) at the other end away from the shaft seal heater (1).

3. The device for recovering condensed water from auxiliary steam of carbon black tail gas power generation steam turbine according to claim 2, characterized in that: The other end of the condensation recovery pipe (7) on the water seal cylinder (6) away from the secondary drain (5) of the shaft seal heater is connected to an exhaust pipe (10), and the other end of the primary drain (4) of the shaft seal heater on the water seal cylinder (6) away from the secondary drain (5) of the shaft seal heater is connected to a water injection pipe (11).

4. The device for recovering condensed water from auxiliary steam of a carbon black tail gas power generation steam turbine according to claim 3, characterized in that: The water seal cylinder (6) further comprises a mirror surface (61), a water level gauge (62), a lifting groove (63) and a floating ball (64); the mirror surface (61) is provided on the circumferential outer wall of the water seal cylinder (6), the water level gauge (62) is provided on one side of the mirror surface (61), the lifting groove (63) is provided on the circumferential inner wall of the water seal cylinder (6), and the floating ball (64) is provided on the inner side of the lifting groove (63).

5. The device for recovering condensed water from auxiliary steam of carbon black tail gas power generation steam turbine according to claim 4, characterized in that: The lifting groove (63) further comprises a water inlet (6301); the lifting groove (63) is provided with the water inlet (6301), and the width of the water inlet (6301) is smaller than the width of the volume of the floating ball (64).

6. The device for recovering condensate of auxiliary steam turbine according to claim 5, characterized in that: The height of the platform (2) is set to seven meters.

7. The device for recovering condensate from auxiliary steam turbine according to claim 6, characterized in that: The height of the water seal cylinder (6) is set to seven meters.

8. The device for recovering condensed water from auxiliary steam of a carbon black tail gas power generation steam turbine according to claim 6, characterized in that: The exhaust port (3) pipeline, the first-level drain (4) and the second-level drain (5) of the shaft seal heater, the condensate recovery pipe (7), the exhaust pipe (10) and the water injection pipe (11) are all provided with a stop valve (9).

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