Steam Utilization System in a Precast Concrete Pipe Pile Factory

Abstract

The invention discloses a steam utilization system for a factory producing concrete pipe piles, comprising: a steam conveying device, a steam curing tank, a plurality of reactors, a steam generating device, a first gas sub-cylinder, a first booster, a second booster and a blowdown expansion tank, wherein a high-pressure steam inlet of the first gas sub-cylinder is connected to the steam generating device, a No. 1 steam inlet of the first booster is connected to a first high-pressure steam outlet of the first gas sub-cylinder, a No. 2 steam inlet of the first booster is connected to the steam conveying device, a steam outlet of the first booster is connected to an air inlet of each reactor, a No. 1 steam inlet of a second booster of the second booster is connected to the first gas sub-cylinder, a No. 2 steam inlet of the second booster is connected to the blowdown expansion tank, a steam outlet of the second booster is connected to the steam curing tank, a steam inlet of the blowdown expansion tank is connected to a steam and condensate outlet of each reactor, and a steam outlet is connected to a No. 2 steam inlet of the second booster of the second booster.

Description

Technical Field

[0001] The present invention relates to the field of steam energy utilization, and particularly to a steam residual pressure utilization system. Background Art

[0002] Concrete pipe piles are cement concrete products produced by the centrifugal forming process and are widely used in building foundation projects. In the production of concrete pipe piles, in order to quickly achieve the strength grade requirements of concrete and reduce the operation cycle of the pipe molds and storage yards, a secondary curing process of steam curing - autoclaving is usually adopted. A large amount of steam is consumed in the production and curing process of concrete pipe piles.

[0003] Currently, factories producing concrete pipe piles adopt the method of centralized heating. However, due to the shortage and high price of coal resources, the steam pressure delivered from the power plant to the factory producing concrete pipe piles at night is insufficient, which greatly affects the production of concrete pipe piles. However, it is necessary to use the steam from the power plant to achieve centralized heating. Therefore, it is necessary to additionally provide high-pressure steam to boost the supplied steam from the power plant to meet the production requirements.

[0004] A pipe pile curing steam recycling system disclosed in Chinese Patent Application No. 201920337710.1 includes a boiler room and an autoclave. The boiler room is connected to the autoclave through an air outlet pipe. The autoclave is connected to a steam curing pool through a connecting pipe. The steam curing pool is connected to a floor heating system through an extension pipe, and the floor heating system is connected to the boiler room through a return pipe. However, this pipe pile curing steam recycling system has the following disadvantages or deficiencies: (1) This patent does not have a boosting device and cannot realize the boosting and utilization of steam; (2) The waste heat of the steam released by the autoclave is difficult to fully utilize because the floor heating system is not required in South China.

[0005] Another example is the prestressed pipe pile autoclave steam recycling system disclosed in Chinese Patent Application No. 201510164061.6, which includes a boiler, an autoclave, and a steam curing pool. The autoclave is connected to the boiler through a steam supply pipe, and a supply valve is arranged on the steam supply pipe. The steam curing pool is connected to the autoclave through a steam exhaust pipe, and an exhaust valve is arranged at the front end of the steam exhaust pipe, and a steam supply valve for the steam curing pool is arranged at the rear end of the steam exhaust pipe. However, this prestressed pipe pile autoclave steam recycling system has the following disadvantages or deficiencies: (1) It is not suitable for the situation of using steam from the power plant to achieve centralized heating, and the use cost is high; (2) The heat after the steam in the curing pool is exhausted is not fully utilized.

[0006] Therefore, it has become an urgent problem in the industry to provide a steam utilization system for factories producing concrete pipe piles that can be applicable to centralized heating, fully utilize the steam residual pressure, boost and utilize the existing centralized heating steam, and achieve the recycling of energy. Summary of the invention

[0007] The purpose of the present invention is to provide a steam pressure boosting and utilization system for a concrete pipe pile production factory, which can make full use of the low-pressure steam delivered by the power plant, and then use the natural gas boiler and the electric boiler to provide high-pressure steam, so that the steam pressure can meet the production requirements of the concrete pipe pile factory. The steam can not only be used for production, but the hot water generated can also be used for heat exchange, thereby achieving the effect of energy recycling.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a steam utilization system for a factory producing concrete pipe piles, comprising: a steam conveying device, a steam curing tank, a plurality of reactors, a steam generating device, a first sub-cylinder, a first booster, a second booster and a sewage expansion tank, wherein the steam conveying device is used to convey low-pressure steam from a power plant, the steam curing tank is used to steam-cure concrete pipe piles with first-pressure steam, the reactor is used to press-cure the steam-cured concrete pipe piles with second-pressure steam, the steam generating device is used to generate high-pressure steam, and is connected to the first sub-cylinder through a pipeline; the first sub-cylinder comprises: a first cylinder body, a high-pressure steam inlet provided on the first cylinder body, a first high-pressure steam outlet, a second high-pressure steam outlet, and a third high-pressure steam outlet, and the high-pressure steam inlet of the first sub-cylinder is connected to the steam generating device through a pipeline; the first booster comprises: a first booster body, a first booster No. 1 steam inlet provided on the first booster body, a first booster No. 2 steam inlet, and a first booster No. 3 steam inlet. The steam inlet and the steam outlet of the first booster, the steam inlet No. 1 of the first booster is connected to the first high-pressure steam outlet of the first gas sub-cylinder, the steam inlet No. 2 of the first booster is connected to the steam conveying device, and the steam outlet of the first booster is connected to the air inlet of each reactor through the reaction steam channel; the second booster comprises: a second booster body, a steam inlet No. 1 of the second booster arranged on the second booster body, a steam inlet No. 2 of the second booster, and a steam outlet of the second booster, the steam inlet No. 1 of the second booster is connected to the second high-pressure steam outlet of the first gas sub-cylinder, the steam inlet No. 2 of the second booster is connected to the sewage expansion tank, and the steam outlet of the second booster is connected to the steam curing tank through a pipeline; the sewage expansion tank comprises: an expansion tank body, a steam inlet, a steam outlet and a sewage outlet arranged on the expansion tank body, the steam inlet is connected to the steam and condensate outlet of each reactor, and the steam outlet is connected to the steam inlet No. 2 of the second booster of the second booster.

[0009] Preferably, one blowdown expansion vessel is connected to 2 to 5 reaction kettles, such as 3 or 4 reaction kettles.

[0010] Preferably, the reactor is a high-pressure reactor.

[0011] Optionally, it further includes a second steam distribution cylinder and a third pressure booster. The second steam distribution cylinder includes: a second cylinder body, a low-pressure steam inlet provided on the second cylinder body, a first low-pressure steam outlet, and a second low-pressure steam outlet. The low-pressure steam inlet is connected to the second pressure booster steam outlet of the second pressure booster through a pipeline. The first low-pressure steam outlet is connected to the steam curing tank to supply low-pressure steam to the steam curing tank. The second low-pressure steam outlet is connected to the third pressure booster through a pipeline. The third pressure booster includes a third pressure booster body, a first third pressure booster steam inlet, a second third pressure booster steam inlet, and a third pressure booster steam outlet provided on the third pressure booster body. The first third pressure booster steam inlet is connected to the third high-pressure steam outlet of the first steam distribution cylinder. The second third pressure booster steam inlet is connected to the second low-pressure steam outlet of the second steam distribution cylinder. The third pressure booster steam outlet is connected to each reaction kettle through a reaction steam channel.

[0012] Optionally, the internal structures of the first pressure booster, the second pressure booster, and the third pressure booster are the same, including: a first steam chamber connected to a steam inlet for introducing high-pressure steam, a nozzle provided at the end of the first steam chamber, a mixing chamber provided in the jet direction of the nozzle and connected thereto, a second steam chamber connected to the mixing chamber and connected to a steam inlet for introducing low-pressure steam, and a diffuser provided at the other end of the mixing chamber. The outlet direction of the diffuser is connected to the steam outlet of the steam.

[0013] Optionally, a steam storage device is provided on the reaction steam channel. The steam storage device is connected to the gas inlet of each reaction kettle, and a valve and a pressure monitor are provided at each gas inlet.

[0014] Optionally, the steam generating device includes: an electric boiler and a natural gas boiler. The electric boiler generates electricity through a solar photovoltaic panel. The high-pressure steam discharge ports of the electric boiler and the natural gas boiler are respectively connected to the high-pressure steam inlet of the first steam distribution cylinder to transmit the generated 2.5 MPa high-pressure steam into the first steam distribution cylinder.

[0015] Optionally, the first pressure is set to 0.3 MPa, and the second pressure is set to 1.0 MPa.

[0016] Optionally, the steam generating device transfers the generated high-pressure steam at 2.5 MPa to the first distribution cylinder. The high-pressure steam at 2.5 MPa enters the first booster from the first high-pressure steam outlet and the first steam inlet of the first booster, and mixes with the low-pressure steam at 0.7 MPa from the power plant conveyed by the steam delivery device to form the second pressure steam at 1.0 MPa. The second pressure steam at 1.0 MPa is conveyed to the steam storage device through the reaction steam channel via the steam outlet of the first booster, and then poured into each reaction kettle until the pressure in each reaction kettle reaches 1.0 MPa. Then, the valve is closed to stop pouring the second pressure steam at 1.0 MPa. When the pressure drops to 0.8 MPa, the valve is opened again to continue pouring the second pressure steam at 1.0 MPa. The high-pressure steam at 2.5 MPa enters the second booster from the second high-pressure steam outlet and the first steam inlet of the second booster, and mixes with the steam at 0.1 MPa from the blowdown flash tank to form the first pressure steam at 0.3 MPa. The first pressure steam at 0.3 MPa enters the second distribution cylinder, enters the steam curing pond through the first low-pressure steam outlet, enters the third booster through the second low-pressure steam outlet, mixes with the high-pressure steam at 2.5 MPa to form the second pressure steam at 1.0 MPa, and is conveyed to the steam storage device through the reaction steam channel via the steam outlet of the third booster.

[0017] Preferably, the second pressure steam at 1.0 MPa generated by the first booster can be transferred to the high-pressure reaction kettles in other workshops for the pressure curing of concrete pipe piles.

[0018] Preferably, the concrete pipe piles are pressure cured in the reaction kettle for 2 to 3 hours.

[0019] Optionally, it further includes a hot water pool, which includes a water storage body, a first hot water inlet, a second hot water inlet and a hot water outlet provided on the water storage body. The first hot water inlet is communicated with the drain outlet of the steam curing pond, and the second hot water inlet is communicated with the sewage outlet of the blowdown flash tank.

[0020] Optionally, it further includes a heat exchanger, which includes a heat exchanger body, a hot sewage inlet, a cold sewage outlet, a cold water inlet and a hot water discharge outlet provided on the heat exchanger body. The hot sewage inlet is communicated with the hot water outlet of the hot water pool, the cold sewage outlet is communicated with the drainage ditch, the cold water inlet is communicated with the cold water source, and the hot water discharge outlet is communicated with the steam generating device.

[0021] Optionally, a water conveyance valve is provided on the pipeline between the second hot water inlet and the sewage outlet of the blowdown flash tank, and a water replenishing water pump is provided on the pipeline between the cold water source and the cold water inlet.

[0022] Optionally, the hot sewage at 85 - 95 °C from the sewage expansion tank and the hot water at 65 - 75 °C from the steam curing tank enter the heat exchanger via the hot water tank. After heat exchange with the cold water at 20 - 25 °C from the cold water source, the hot water at 70 - 80 °C formed is transported to the steam generation device to generate high-pressure steam, and the cold sewage at 20 - 25 °C formed after heat exchange is discharged into the drainage ditch.

[0023] The beneficial effects of the present invention are as follows: (1) The residual pressure of the steam generated after high-pressure steam curing is fully exploited. The first-pressure steam formed after mixing with high-pressure steam is provided to the steam curing tank to cure concrete pipe piles, making full use of steam energy and being more energy-saving and environmentally friendly; (2) The energy of the hot water discharged from the steam curing tank and the sewage expansion tank is effectively utilized. The cold water is heat-exchanged into hot water at about 75 °C and then provided to the electric boiler and the natural gas boiler, so that high-pressure steam can be quickly generated. This not only improves the energy utilization rate of the entire system but also improves the steam generation efficiency, being energy-saving and environmentally friendly; (3) It is applicable to centralized heating using power plant steam. While increasing the pressure of the power plant steam to ensure production capacity and output, it achieves an environmental protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It shows a schematic structural diagram of the steam utilization system of the concrete pipe pile production factory of the present invention.

[0025] Figure 2 It shows a schematic structural diagram of the first booster of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0027] Please refer to Figure 1 , as a non-limiting embodiment, the steam utilization system of the concrete pipe pile production factory provided by the present invention includes: a steam delivery device 1, an electric boiler 2, a natural gas boiler 3, a steam curing tank 4, three reaction kettles 5, a sewage expansion tank 6, a first distribution cylinder F1, a second distribution cylinder F2, a first booster S1, a second booster S2, and a third booster S3.

[0028] In this non-limiting embodiment, the steam curing tank 4 uses first-pressure steam at 0.3 MPa to cure the concrete pipe piles, and the autoclave 5 uses second-pressure steam at 1.0 MPa to pressure-cure the concrete pipe piles that have been steam-cured. The steam delivery device 1 delivers low-pressure steam at 0.7 MPa from the power plant to the first pressure booster S1. The electric boiler 2 and the natural gas boiler 3 respectively generate high-pressure steam at 2.5 MPa, and the high-pressure steam is delivered to the first steam distribution cylinder F1. As Figure 1 shown, the electric boiler 2 generates electricity through the solar photovoltaic panel 7.

[0029] The first steam distribution cylinder F1 includes a first cylinder body (not labeled in the figure), a high-pressure steam inlet F10, a first high-pressure steam outlet F11, a second high-pressure steam outlet F12, and a third high-pressure steam outlet F13. The high-pressure steam inlet F10 of the first steam distribution cylinder F1 is connected to the electric boiler 2 and the natural gas boiler 3 through a pipeline.

[0030] The first pressure booster S1 includes a first pressure booster body (not labeled in the figure), a first pressure booster first steam inlet S11, a first pressure booster second steam inlet S12, and a first pressure booster steam outlet S13. The first pressure booster first steam inlet S11 is connected to the first high-pressure steam outlet F11 of the first steam distribution cylinder F1. The first pressure booster second steam inlet S12 is connected to the steam delivery device 1. The first pressure booster steam outlet S13 is connected to the air inlet 51 of each autoclave 5 through a reaction steam channel L.

[0031] The second pressure booster S2 includes a second pressure booster body (not labeled in the figure), a second pressure booster first steam inlet S21, a second pressure booster second steam inlet S22, and a second pressure booster steam outlet S23. The second pressure booster first steam inlet S21 is connected to the second high-pressure steam outlet F12 of the first steam distribution cylinder F1. The second pressure booster second steam inlet S22 is connected to the blowdown flash tank 6. The second pressure booster steam outlet S23 is connected to the steam curing tank 4 through a pipeline.

[0032] The blowdown flash tank 6 includes a flash tank body (not labeled in the figure), a steam inlet 61, a steam outlet 62, and a sewage outlet 63. The steam inlet 61 is connected to the steam and condensate discharge outlet 52 of each autoclave 5. The steam outlet 62 is connected to the second pressure booster second steam inlet S22 of the second pressure booster S2.

[0033] As another non-limiting embodiment, the second steam distribution cylinder F2 includes a second cylinder body (not labeled in the figure), a low-pressure steam inlet F20, a first low-pressure steam outlet F21, and a second low-pressure steam outlet F22. The low-pressure steam inlet F20 is connected to the second steam outlet S23 of the second booster S2 through a pipeline. The first low-pressure steam outlet F21 is connected to the steam curing tank 4, so as to supply low-pressure steam of 0.3 MPa to the steam curing tank 4. The second low-pressure steam outlet F22 is connected to the third booster S3 through a pipeline.

[0034] The third booster S3 includes a third booster body (not labeled in the figure), a first steam inlet S31 of the third booster, a second steam inlet S32 of the third booster, and a steam outlet S33 of the third booster. The first steam inlet S31 of the third booster is connected to the third high-pressure steam outlet F13 of the first steam distribution cylinder F1. The second steam inlet S32 of the third booster is connected to the second low-pressure steam outlet F22 of the second steam distribution cylinder F2. The steam outlet S33 of the third booster is connected to each reactor 5 through a reaction steam channel L.

[0035] In this non-limiting embodiment, the internal structures of the first booster S1, the second booster S2, and the third booster S3 are the same. Taking the first booster S1 as an example, as Figure 2 shown, its internal includes: a first steam chamber S101, a second steam chamber S102, a nozzle S103, a mixing chamber S104, and a diffuser S105. Specifically, the first steam inlet S11 for introducing high-pressure steam is connected to the first steam chamber S101, and after the action of the nozzle S103, it enters the mixing chamber S104 at a high speed, forming a local negative pressure, sucking the low-pressure steam at the second steam inlet S12 of the first booster into the mixing chamber S104. After mixing with the high-pressure steam, medium-pressure steam is formed at the diffuser S105 and is transported to the outside of the first booster through the first booster steam outlet S13.

[0036] As another non-limiting embodiment, a steam storage device 8 is provided on the reaction steam channel L. The steam storage device 8 is connected to the gas inlet 51 of each reactor 5. A valve V and a pressure monitor P are provided at each gas inlet 51, so that the steam pressure in each reactor can be monitored at any time and the steam injection into each reactor can be controlled.

[0037] It can be seen that the electric boiler 2 and the natural gas boiler 3 transmit the 2.5 MPa high-pressure steam they generate to the first distribution cylinder F1. The 2.5 MPa high-pressure steam enters the first booster S1 from the first high-pressure steam outlet F11 and the first steam inlet S11 of the first booster, and mixes with the 0.7 MPa low-pressure steam from the power plant transported by the steam transmission device 1 to form the second pressure steam of 1.0 MPa. The second pressure steam of 1.0 MPa is transported to the steam storage device 8 through the reaction steam channel L via the steam outlet S13 of the first booster, and then poured into each reaction kettle 5 until the pressure in each reaction kettle 5 reaches 1.0 MPa. Then, the valve V is closed to stop pouring the second pressure steam of 1.0 MPa. When the pressure drops to 0.8 MPa, the valve V is opened again to continue pouring the second pressure steam of 1.0 MPa. At the same time, the 2.5 MPa high-pressure steam enters the second booster S2 from the second high-pressure steam outlet F12 and the first steam inlet S21 of the second booster, and mixes with the 0.1 MPa steam from the blowdown flash tank 6 to form the first pressure steam of 0.3 MPa. The first pressure steam of 0.3 MPa enters the second distribution cylinder F2, enters the steam curing tank 4 through the first low-pressure steam outlet F21, enters the third booster S3 through the second low-pressure steam outlet F22, mixes with the 2.5 MPa high-pressure steam to form the second pressure steam of 1.0 MPa, and is transported to the steam storage device through the reaction steam channel L via the steam outlet S33 of the third booster.

[0038] There can be multiple workshops for producing concrete pipe piles, such as 5 to 10. In this way, the 1.0 MPa second pressure steam generated by the first booster S1 can also be transmitted to the high-pressure reaction kettles 5 in other workshops for pressure curing of concrete pipe piles.

[0039] As another non-limiting implementation manner, it further includes a hot water tank 9 and a heat exchanger 10. The hot water tank 9 includes a water storage body (not labeled in the figure), a first hot water inlet 91, a second hot water inlet 92, and a hot water outlet 93. The first hot water inlet 91 is communicated with the drain outlet (not labeled in the figure) of the steam curing tank 4, and the second hot water inlet 92 is communicated with the sewage outlet 63 of the blowdown flash tank 6. The heat exchanger 10 includes a heat exchanger body (not labeled in the figure), a hot sewage inlet 101, a cold sewage outlet 102, a cold water inlet 103, and a hot water discharge outlet 104. The hot sewage inlet 101 is communicated with the hot water outlet 93 of the hot water tank, the cold sewage outlet 102 is communicated with the drainage ditch (not shown in the figure), the cold water inlet 103 is communicated with the cold water source (not shown in the figure), and the hot water discharge outlet 104 is communicated with the electric boiler 2 and the natural gas boiler 3.

[0040] For the convenience of control, a water conveyance valve G1 is provided on the pipeline between the second hot water inlet 92 and the sewage outlet 63 of the sewage expansion vessel 6, and a make-up water pump G2 is provided on the pipeline between the cold water source and the cold water inlet 103.

[0041] Thus, the hot sewage at 85 - 95 °C from the sewage expansion vessel 6 and the hot water at 65 - 75 °C from the steam curing pond 4 enter the heat exchanger 10 via the hot water tank 9, and after heat exchange with the cold water at 20 - 25 °C from the cold water source, the hot water at 70 - 80 °C formed is conveyed to the electric boiler 2 and the natural gas boiler 3 to generate high-pressure steam, and the cold sewage at 20 - 25 °C formed after heat exchange is discharged to the drainage ditch.

[0042] Although the preferred embodiments of the present invention have been described in detail herein, it should be understood that the present invention is not limited to the specific structures described and illustrated in detail here, and other variations and modifications can be implemented by those skilled in the art without departing from the essence and scope of the present invention.

Claims

1. A steam utilization system for a concrete pipe pile production factory, comprising: A steam conveying device, a steam curing tank, and a plurality of reaction kettles. The steam conveying device is used to convey low-pressure steam from a power plant. The steam curing tank is used to cure concrete pipe piles with first-pressure steam. The reaction kettle is used to compress and cure the concrete pipe piles that have been cured with second-pressure steam; It is characterized in that the steam utilization system of the concrete pipe pile production factory further includes: a steam generating device, a first steam header, a first booster, a second booster, and a blowdown flash tank; Among them, the steam generating device is used to generate high-pressure steam, and it is connected to the first steam header through a pipeline; The first steam header includes: a first cylinder body, a high-pressure steam inlet, a first high-pressure steam outlet, a second high-pressure steam outlet, and a third high-pressure steam outlet provided on the first cylinder body. The high-pressure steam inlet of the first steam header is connected to the steam generating device through a pipeline; The first booster includes: a first booster body, a first booster first steam inlet, a first booster second steam inlet, and a first booster steam outlet provided on the first booster body. The first booster first steam inlet is connected to the first high-pressure steam outlet of the first steam header. The first booster second steam inlet is connected to the steam conveying device. The first booster steam outlet is connected to the air inlet of each reaction kettle through a reaction steam channel; The second booster includes: a second booster body, a second booster first steam inlet, a second booster second steam inlet, and a second booster steam outlet provided on the second booster body. The second booster first steam inlet is connected to the second high-pressure steam outlet of the first steam header. The second booster second steam inlet is connected to the blowdown flash tank. The second booster steam outlet is connected to the steam curing tank through a pipeline; The blowdown flash tank includes: a flash tank body, a steam inlet, a steam outlet, and a sewage outlet provided on the flash tank body. The steam inlet is connected to the steam and condensate discharge outlet of each reaction kettle. The steam outlet is connected to the second booster second steam inlet of the second booster; 2. The steam utilization system of the precast concrete pile manufacturing plant according to claim 1, characterized in that, It further includes a second steam header and a third booster; Among them, the second steam header includes: a second cylinder body, a low-pressure steam inlet, a first low-pressure steam outlet, and a second low-pressure steam outlet provided on the second cylinder body. The low-pressure steam inlet is connected to the second booster steam outlet of the second booster through a pipeline. The first low-pressure steam outlet is connected to the steam curing tank to provide low-pressure steam to the steam curing tank. The second low-pressure steam outlet is connected to the third booster through a pipeline; The third step-up pressure vessel includes a third step-up pressure vessel body, a first steam inlet of the third step-up pressure vessel, a second steam inlet of the third step-up pressure vessel, and a steam outlet of the third step-up pressure vessel provided on the third step-up pressure vessel body. The first steam inlet of the third step-up pressure vessel is communicated with the third high-pressure steam outlet of the first steam distribution cylinder. The second steam inlet of the third step-up pressure vessel is communicated with the second low-pressure steam outlet of the second steam distribution cylinder. The steam outlet of the third step-up pressure vessel is communicated with each reaction kettle through the reaction steam channel.

3. The steam utilization system of the precast concrete pile factory according to claim 2, characterized in that, The internal structures of the first step-up pressure vessel, the second step-up pressure vessel, and the third step-up pressure vessel are the same, including: a first steam chamber communicated with a steam inlet for introducing high-pressure steam, a nozzle provided at the end of the first steam chamber, a mixing chamber provided in the jet direction of the nozzle and communicated with the nozzle, a second steam chamber communicated with the mixing chamber and communicated with a steam inlet for introducing low-pressure steam, and a diffuser provided at the other end of the mixing chamber. The gas outlet direction of the diffuser is communicated with the steam outlet of the steam.

4. The steam utilization system of the precast concrete pile manufacturing plant according to claim 3, characterized in that, A steam storage device is provided on the reaction steam channel. The steam storage device is communicated with the gas inlet of each reaction kettle. A valve and a pressure monitor are provided at each gas inlet.

5. The steam utilization system of the precast concrete pile factory as claimed in claim 4, wherein The steam generating device includes: an electric boiler and a natural gas boiler. The electric boiler generates electricity through a solar photovoltaic panel. The high-pressure steam discharge ports of the electric boiler and the natural gas boiler are respectively communicated with the high-pressure steam inlet of the first steam distribution cylinder to transmit the generated high-pressure steam of 2.5 MPa to the first steam distribution cylinder.

6. The steam utilization system of the precast concrete pile manufacturing plant as claimed in claim 5, wherein, The first pressure is set to 0.3 MPa, and the second pressure is set to 1.0 MPa.

7. The steam utilization system of the precast concrete pile factory as claimed in claim 6, wherein The steam generating device transmits the generated high-pressure steam of 2.5 MPa to the first steam distribution cylinder. The high-pressure steam of 2.5 MPa enters the first step-up pressure vessel from the first high-pressure steam outlet and the first steam inlet of the first step-up pressure vessel, and is mixed with the low-pressure steam of 0.7 MPa from the power plant conveyed by the steam conveying device to form the second pressure steam of 1.0 MPa. The second pressure steam of 1.0 MPa is conveyed to the steam storage device through the reaction steam channel via the steam outlet of the first step-up pressure vessel, and then poured into each reaction kettle until the pressure in each reaction kettle reaches 1.0 MPa. The valve is closed to stop pouring the second pressure steam of 1.0 MPa. When the pressure drops to 0.8 MPa, the valve is opened again to continue pouring the second pressure steam of 1.0 MPa; High-pressure steam at 2.5 MPa enters the second booster through the second high-pressure steam outlet and the first steam inlet of the second booster, and mixes with steam at 0.1 MPa from the blowdown flash tank to form first-pressure steam at 0.3 MPa. The first-pressure steam at 0.3 MPa enters the second steam header, enters the steam curing pond through the first low-pressure steam outlet, enters the third booster through the second low-pressure steam outlet, mixes with high-pressure steam at 2.5 MPa to form second-pressure steam at 1.0 MPa, and is conveyed to the steam storage device through the reaction steam channel via the steam outlet of the third booster.

8. The steam utilization system of the precast concrete pile factory as claimed in claim 5, wherein It further includes a hot water tank, which includes a water storage body, a first hot water inlet, a second hot water inlet and a hot water outlet provided on the water storage body. The first hot water inlet is communicated with the drain outlet of the steam curing pond, and the second hot water inlet is communicated with the sewage outlet of the blowdown flash tank.

9. The steam utilization system of the precast concrete pile factory according to claim 8, characterized in that, It further includes a heat exchanger, which includes a heat exchanger body, a hot sewage inlet, a cold sewage outlet, a cold water inlet and a hot water discharge outlet provided on the heat exchanger body. The hot sewage inlet is communicated with the hot water outlet of the hot water tank, the cold sewage outlet is communicated with the drainage ditch, the cold water inlet is communicated with a cold water source, and the hot water discharge outlet is communicated with the steam generating device.

10. The steam utilization system of the precast concrete pile factory according to claim 9, characterized in that, A water conveyance valve is provided on the pipeline between the second hot water inlet and the sewage outlet of the blowdown flash tank, and a makeup water pump is provided on the pipeline between the cold water source and the cold water inlet.

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