Waste heat power generation system

Abstract

A waste heat power generation system belongs to the technical field of steam turbines. The main steam pipe is communicated with the pressure stabilizing tank, an input port of the pressure stabilizing valve is communicated with the pressure stabilizing tank, an output port of the pressure stabilizing valve is simultaneously connected with two steam guide pipes, output ends of the two steam guide pipes are respectively communicated with two input ports of the regulating valve, an output port of the regulating valve is connected with the steam turbine, the steam turbine is connected with a generator set, and a balance pipe is arranged between the pressure stabilizing tank and the pressure stabilizing valve. According to the waste heat power generation system, the pressure stabilizing tank communicates with the pressure stabilizing valve through the balance pipe, the opening degree of the pressure stabilizing valve can be adjusted in real time according to the pressure of steam in the pressure stabilizing tank, the flow of the steam can be increased when the steam pressure is reduced, and therefore the problem that a steam turbine cannot work under the adaptive working condition due to the fact that the steam pressure is reduced is solved; the steam turbine can work stably, steam can be fully utilized, the pressure stabilizing tank can achieve the pressure stabilizing effect, and it is guaranteed that pressure feedback of the main steam pipe is more accurate.

Description

Technical Field

[0001] The invention discloses a waste heat power generation system, belonging to the technical field of steam turbines. Background Art

[0002] Waste heat generator sets are important equipment in power plants, and the air intake temperature and pressure of the units are important indicators of safe operation. The preheating power generation system of cement manufacturers is based on the clinker production line, which uses the preheating of the clinker production line to generate steam and drive the steam turbine to operate.

[0003] However, after the preheating power generation system has been running for a period of time, as the production line increases and energy consumption decreases, the system steam pressure will decrease, and the actual operating value will gradually deviate from the design value. At the same temperature, the change in pressure has a greater impact on the specific volume of steam. Due to the increase in steam volume, the turbine flow rate cannot adapt to the full digestion and utilization of steam under the original design pressure under the current working conditions. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a waste heat power generation system which can automatically adjust the opening according to the steam pressure so that the steam flow rate changes synchronously with the steam pressure, so that the steam turbine can work under suitable working conditions.

[0005] The technical solution adopted by the utility model to solve its technical problems is: the waste heat power generation system includes a pressure-stabilizing tank, a pressure-stabilizing valve, a steam pipe, a regulating valve and a steam turbine, the main steam pipe is connected to the pressure-stabilizing tank, the input port of the pressure-stabilizing valve is connected to the pressure-stabilizing tank, the output port of the pressure-stabilizing valve is connected to two steam pipes at the same time, the output ends of the two steam pipes are respectively connected to the two input ports of the regulating valve, the output port of the regulating valve is connected to the steam turbine, the steam turbine is connected to a generator set, and a balancing pipe is arranged between the pressure-stabilizing tank and the pressure-stabilizing valve.

[0006] Preferably, the pressure-stabilizing valve includes a valve body, a valve core, an operating assembly and a pressure-stabilizing assembly. An air inlet chamber and an exhaust chamber are provided in the valve body. The air inlet chamber and the exhaust chamber are connected via a connecting port. The valve core is provided on one side of the connecting port and is opposite to the connecting port. The diameter of the valve core gradually decreases in the direction approaching the connecting port. The pressure-stabilizing assembly and the operating assembly are both connected to the valve core. A balancing pipe is provided between the pressure-stabilizing assembly and the pressure-stabilizing tank.

[0007] Preferably, the pressure stabilizing assembly includes a pressure stabilizing disk, a pressure diaphragm and a balancing spring. A pressure stabilizing chamber is provided in the pressure stabilizing disk. The pressure diaphragm is provided in the middle of the pressure stabilizing chamber and divides the pressure stabilizing chamber into a detection chamber away from the valve core and a balancing chamber close to the valve core. A connecting disk is provided in the middle of the pressure diaphragm. The valve core is fixedly connected to the connecting disk. The detection chamber is connected to the balancing pipe. The balancing spring is provided in the balancing chamber and the balancing spring is connected to the connecting disk.

[0008] Preferably, the voltage stabilizing assembly also includes a connecting sleeve, a pressure plate and a joystick. The joystick is stepped in shape with a diameter at one end larger than that at the other end. The large end of the joystick extends into the detection cavity and is fixedly connected to the connecting plate. The connecting sleeve is rotatably sleeved on the outside of the small end of the joystick. The pressure plate is threadedly connected to the small end of the joystick and cooperates with the shoulder of the joystick to limit the connecting sleeve. An annular groove is provided around the inner wall of the connecting sleeve, and an air inlet hole connected to the annular groove is provided on one side of the connecting sleeve. A connecting channel is provided on the joystick, and one end of the connecting channel is connected to the detection cavity, and the other end is connected to the annular groove.

[0009] Preferably, the pressure stabilizing plate comprises an upper plate body and a lower plate body, and the upper plate body is detachably connected to the lower plate body and presses the outer edge of the pressure diaphragm.

[0010] Preferably, the operating assembly includes a mounting cylinder and an adjusting cylinder, the mounting cylinder is fixedly connected to the valve body, one end of the adjusting cylinder is connected to the pressure stabilizing disk, and the other end extends into the mounting cylinder and is threadedly connected to the mounting cylinder.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The balancing pipe of the waste heat power generation system connects the pressure-stabilizing tank with the pressure-stabilizing valve, and can adjust the opening of the pressure-stabilizing valve in real time according to the pressure of the steam in the pressure-stabilizing tank. When the steam pressure decreases, the steam flow rate can be increased, thereby avoiding the problem that the steam turbine cannot work under the appropriate working conditions due to the decrease in steam pressure, so that the steam turbine can work stably and the steam can be fully utilized. The pressure-stabilizing tank can achieve the effect of pressure stabilization, ensuring that the pressure feedback to the main steam pipe is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the waste heat power generation system;

[0014] Figure 2 It is a schematic diagram of a main cross-sectional view of a regulating valve;

[0015] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0016] In the figure: 1. main steam pipe; 2. pressure-stabilizing tank; 3. balancing pipe; 4. pressure-stabilizing valve; 401. valve body; 402. air inlet chamber; 403. exhaust chamber; 404. connecting port; 405. valve core; 406. valve stem; 407. sealing box; 408. mounting cylinder; 409. adjusting cylinder; 410. balancing spring; 411. lower plate; 412. upper plate; 413. pressure diaphragm; 414. connecting plate; 415. hand wheel; 416. joystick; 417. connecting channel; 418. connecting sleeve; 419. annular groove; 420. air inlet hole; 421. pressure plate; 5. steam guide pipe; 6. steam turbine; 7. generator set; 8. regulating valve. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention necessarily exceeds these limited embodiments. For some equivalent replacement schemes or common means, they are no longer described in detail herein, but still fall within the scope of protection of the present application.

[0018] Figures 1 to 3 It is the best embodiment of the utility model, and the following Figures 1 to 3 The utility model is further described.

[0019] A waste heat power generation system includes a pressure-stabilizing tank 2, a pressure-stabilizing valve 4, a steam pipe 5, a regulating valve 8 and a steam turbine 6. A main steam pipe 1 is connected to the pressure-stabilizing tank 2, an input port of the pressure-stabilizing valve 4 is connected to the pressure-stabilizing tank 2, an output port of the pressure-stabilizing valve 4 is connected to two steam pipes 5 at the same time, the output ends of the two steam pipes 5 are respectively connected to two input ports of the regulating valve 8, the output port of the regulating valve 8 is connected to the steam turbine 6, the steam turbine 6 is connected to a generator set 7, and a balance pipe 3 is arranged between the pressure-stabilizing tank 2 and the pressure-stabilizing valve 4. The balance pipe 3 of the waste heat power generation system connects the pressure-stabilizing tank 2 with the pressure-stabilizing valve 4, can adjust the opening of the pressure-stabilizing valve 4 in real time according to the pressure of the steam in the pressure-stabilizing tank 2, can increase the flow rate of steam when the steam pressure decreases, thereby avoiding the problem that the steam turbine 6 cannot work under the adapted working condition due to the decrease of steam pressure, so that the steam turbine 6 can work stably and make full use of the steam, the pressure-stabilizing tank 2 can achieve the effect of pressure stabilization, and ensure that the pressure feedback to the main steam pipe 1 is more accurate.

[0020] Specifically, Figure 1As shown: the main steam pipe 1 is used to transport steam, the output port of the main steam pipe 1 is connected to the bottom of the pressure-stabilizing tank 2, the top of the pressure-stabilizing tank 2 is connected to the input port of the pressure-stabilizing valve 4, one end of the balance pipe 3 is connected to the side of the pressure-stabilizing tank 2, and the other end is connected to the pressure-stabilizing valve 4, the steam pressure in the pressure-stabilizing tank 2 is equal to the pressure in the main steam pipe 1, and the steam pressure can be avoided from fluctuating, thereby ensuring the stable operation of the pressure-stabilizing valve 4. The output port of the pressure-stabilizing valve 4 is connected to two steam guide pipes 5 at the same time, the input port of each steam guide pipe 5 is connected to the output port of the pressure-stabilizing valve 4, the output port of each steam guide pipe 5 is respectively connected to the input ports on both sides of the regulating valve 8, the output port of the regulating valve 8 is connected to the steam turbine 6, and the main shaft of the steam turbine 6 is connected to the generator set 7.

[0021] The regulating valve 8 can directly adopt the existing steam turbine regulating valve, and its specific structure will not be described in detail here.

[0022] like Figure 2-3 As shown: the pressure stabilizing valve 4 includes a valve body 401, a valve core 405, an operating assembly and a pressure stabilizing assembly. The valve body 401 is a cylinder with both ends open. In this embodiment, the left end of the valve body 401 is an input port, and the right end is an output port. A partition is provided in the valve body 401 to separate the inner cavity of the valve body 401 into an air intake cavity 402 on the left and an air exhaust cavity 403 on the right. A vertical connecting port 404 is provided in the middle of the partition. The connecting port 404 is vertically arranged and connects the air intake cavity 402 and the air exhaust cavity 403. In this embodiment, the diameter of the connecting port 404 gradually decreases from top to bottom. The valve core 405 is arranged in the exhaust cavity 403, and the valve core 405 is located just above the communication port 404. The diameter of the valve core 405 gradually decreases from top to bottom. A valve stem 406 is arranged on the upper side of the valve core 405. The upper end of the valve stem 406 can be rotatably extended out of the valve body 401, and a seal is arranged between the valve stem 406 and the valve body 401. The operating assembly and the voltage stabilizing assembly are both connected to the valve stem 406.

[0023] Furthermore, the valve core 405 and the valve stem 406 can rotate relative to each other to avoid relative rotation between the valve core 405 and the communication port 404 .

[0024] The pressure stabilizing component can control the action of the valve core 405 when the pressure fluctuates, so that the flow rate of the steam is adjusted synchronously with the pressure of the steam, and the flow rate of the steam is increased when the pressure decreases.

[0025] A sealing box 407 is provided on the upper side of the valve body 401 . The sealing box 407 is a cylinder sleeved outside the valve stem 406 . A packing seal is provided inside the sealing box 407 to ensure reliable sealing between the valve stem 406 and the valve body 401 .

[0026] The pressure stabilizing assembly includes a pressure stabilizing plate, a pressure diaphragm 413 , a balance spring 410 , a connecting sleeve 418 , a pressure plate 421 and a joystick 416 .

[0027] The pressure stabilizing plate includes an upper plate body 412 and a lower plate body 411. Flange plates are arranged around the edge of the upper plate body 412 and the edge of the lower plate body 411. The upper plate body 412 and the lower plate body 411 are fixedly connected by bolts. The pressure diaphragm 413 is arranged between the upper plate body 412 and the lower plate body 411. The upper plate body 412 and the lower plate body 411 press the edge of the pressure diaphragm 413 tightly, thereby fixing the pressure diaphragm 413. The pressure diaphragm 413 divides the inner cavity of the pressure stabilizing plate into an upper detection cavity and a lower balancing cavity. A connecting plate 414 is fixed in the middle of the pressure diaphragm 413. The upper end of the valve stem 406 extends into the balancing cavity and is fixedly connected to the connecting plate 414. The balancing spring 410 is arranged in the balancing cavity, and the balancing spring 410 is connected to the connecting plate 414.

[0028] The operating rod 416 is in a stepped shape with a diameter at the upper end smaller than that at the lower end. The large end of the operating rod 416 extends into the detection cavity. The lower end of the operating rod 416 is fixedly connected to the connecting plate 414. A hand wheel 415 is installed at the upper end of the operating rod 416. Bosses are provided on both sides of the valve stem 406. The existence of the bosses can ensure that the pressure stabilizing plate and the valve stem 406 rotate synchronously. The hand wheel 415 can drive the operating rod 416 to rotate, thereby driving the entire pressure stabilizing plate to rotate.

[0029] The connecting sleeve 418 is rotatably sleeved outside the lower end of the operating rod 416, and the pressure plate 412 is threadedly connected to the lower end of the operating rod 416. The pressure plate 412 is arranged on the upper side of the connecting sleeve 418, and cooperates with the shoulder of the operating rod 416 to achieve the limit between the connecting sleeve 418. An annular groove 419 is arranged around the inner wall of the connecting sleeve 418, and the connecting sleeve 418 and the operating rod 416 are sealed. An air inlet 420 is arranged on one side of the connecting sleeve 418, and the air inlet 420 is connected to the annular groove 419. A connecting channel 417 is arranged on the operating rod 416, and one end of the connecting channel 417 is connected to the detection cavity, and the other end is connected to the annular groove 419. The air inlet 420 is connected to the balance pipe 3, thereby avoiding the mutual interference between the pressure stabilizing plate and the balance pipe 3 when rotating.

[0030] The operating assembly includes a mounting cylinder 408 and an adjusting cylinder 409. The mounting cylinder 408 is arranged on the upper side of the sealing box 407. The mounting cylinder 408 is sleeved outside the valve stem 406. The inner wall of the mounting cylinder 408 is provided with threads. The adjusting cylinder 409 is arranged on the lower side of the lower plate body 411. The lower end of the adjusting cylinder 409 is closed, and the upper end is connected to the balance chamber. The lower end of the balance spring 410 is supported on the closed end of the adjusting cylinder 409, and the upper end is supported on the connecting plate 414. The bosses on both sides of the valve stem 406 rotate synchronously with the adjusting cylinder 409. The lower end of the adjusting cylinder 409 extends into the mounting cylinder 408 and is threadedly connected with the mounting cylinder 408.

[0031] When the opening of the pressure stabilizing valve 4 needs to be adjusted, the hand wheel 415 is rotated to drive the pressure stabilizing disk and the adjusting cylinder 409 to rotate. Due to the relative rotation between the adjusting cylinder 409 and the mounting cylinder 408, the height of the valve core 405 is adjusted to adjust the opening of the communication port 404. Due to the existence of the balance spring 410 and the pressure of the detection chamber, the valve core 405 and the pressure stabilizing disk can be raised and lowered synchronously, and the communication port 404 can be closed.

[0032] When the pressure in the pressure-stabilizing tank 2 decreases, the pressure in the detection chamber decreases. At this time, under the action of the balance spring 410, the connecting plate 414 and the pressure diaphragm 413 rise synchronously, thereby driving the valve core 405 to rise. At this time, the opening of the connecting port 404 increases, thereby achieving the purpose of adjusting the opening of the pressure-stabilizing valve 4 according to the pressure of the steam.

[0033] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A waste heat power generation system, characterized in that: The invention comprises a pressure stabilizing tank (2), a pressure stabilizing valve (4), a steam guide pipe (5), a regulating valve (8) and a steam turbine (6), wherein a main steam pipe (1) is connected to the pressure stabilizing tank (2), an input port of the pressure stabilizing valve (4) is connected to the pressure stabilizing tank (2), an output port of the pressure stabilizing valve (4) is connected to two steam guide pipes (5) at the same time, output ends of the two steam guide pipes (5) are respectively connected to two input ports of the regulating valve (8), an output port of the regulating valve (8) is connected to the steam turbine (6), the steam turbine (6) is connected to a generator set (7), and a balancing pipe (3) is arranged between the pressure stabilizing tank (2) and the pressure stabilizing valve (4).

2. The waste heat power generation system according to claim 1, characterized in that: The pressure-stabilizing valve (4) comprises a valve body (401), a valve core (405), an operating assembly and a pressure-stabilizing assembly. An air inlet chamber (402) and an air outlet chamber (403) are arranged in the valve body (401). The air inlet chamber (402) and the air outlet chamber (403) are connected via a connecting port (404). The valve core (405) is arranged on one side of the connecting port (404) and is arranged opposite to the connecting port (404). The diameter of the valve core (405) gradually decreases in a direction approaching the connecting port (404). The pressure-stabilizing assembly and the operating assembly are both connected to the valve core (405). The balancing pipe (3) is arranged between the pressure-stabilizing assembly and the pressure-stabilizing tank (2).

3. The waste heat power generation system according to claim 2, characterized in that: The pressure stabilizing assembly comprises a pressure stabilizing disk, a pressure diaphragm (413) and a balancing spring (410); a pressure stabilizing cavity is arranged in the pressure stabilizing disk; the pressure diaphragm (413) is arranged in the middle of the pressure stabilizing cavity and divides the pressure stabilizing cavity into a detection cavity away from the valve core (405) and a balancing cavity close to the valve core (405); a connecting disk (414) is arranged in the middle of the pressure diaphragm (413); the valve core (405) and the connecting disk (414) are fixedly connected; the detection cavity is communicated with the balancing pipe (3); the balancing spring (410) is arranged in the balancing cavity; and the balancing spring (410) is connected to the connecting disk (414).

4. The waste heat power generation system according to claim 3, characterized in that: The voltage stabilizing assembly further comprises a connecting sleeve (418), a pressure plate (421) and an operating rod (416). The operating rod (416) is in a stepped shape with a diameter at one end being larger than a diameter at the other end. The large end of the operating rod (416) extends into the detection cavity and is fixedly connected to the connecting plate (414). The connecting sleeve (418) is rotatably sleeved on the small end of the operating rod (416). The pressure plate (421) is threadedly connected to the small end of the operating rod (416) and cooperates with the shoulder of the operating rod (416) to limit the connecting sleeve (418). An annular groove (419) is arranged around the inner wall of the connecting sleeve (418). An air inlet (420) communicating with the annular groove (419) is arranged on one side of the connecting sleeve (418). A connecting channel (417) is arranged on the operating rod (416). One end of the connecting channel (417) is communicated with the detection cavity, and the other end is communicated with the annular groove (419).

5. The waste heat power generation system according to claim 3, characterized in that: The pressure stabilizing plate comprises an upper plate body (412) and a lower plate body (411), wherein the upper plate body (412) and the lower plate body (411) are detachably connected and press the outer edge of the pressure diaphragm (413).

6. The waste heat power generation system according to claim 2, characterized in that: The operating assembly comprises a mounting cylinder (408) and an adjusting cylinder (409); the mounting cylinder (408) is fixedly connected to the valve body (401); one end of the adjusting cylinder (409) is connected to the pressure stabilizing disk, and the other end extends into the mounting cylinder (408) and is threadedly connected to the mounting cylinder (408).

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