Auxiliary machine two-way water supply system of subcritical generator set

Abstract

The utility model discloses a subcritical generator set auxiliary machine two-way water supply system which comprises a second-stage water pool, a third-stage water pool, a communicating pipe, a first water supply pipe and a second water supply pipe, the second-stage water pool and the third-stage water pool are communicated through the communicating pipe, the communicating pipe is communicated with the first water supply pipe, the first water supply pipe is communicated with an auxiliary machine, and the second water supply pipe is communicated with the third-stage water pool. The second water supply pipe is communicated with a factory production fire-fighting water pipe network, and the auxiliary machine cooling water inlet pipe is further communicated with the second water supply pipe. Two paths of water supply are arranged for auxiliary machine cooling, the safety coefficient of water supply is improved, and construction is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of steel production, especially to a two-way water supply system for auxiliary machines of a subcritical generating set. BACKGROUND

[0002] With the development of steel enterprises, it has become a trend to build self-provided power plants. This is mainly because the excess coal gas and waste heat in the steel production process can be comprehensively utilized through the self-provided power plant, which can provide the required steam and cheap power for the steel enterprise. Such power can be used as security power and part of working power.

[0003] The original three 25MW generating sets of the company were constructed in three phases. Each of the three 25MW generating sets is matched with a circulating water system, which includes a water pump house, a pool, a cooling tower and other systems. Two cooling towers are arranged in each of the systems of the first, second and third phases. A new 150MW subcritical generating set is built. Under the premise that there is a large amount of surplus in the original cooling water system and there is no space to build a matching generating set, the water pump house of the third phase is modified to meet the water demand of the newly-built 150MW generating set, and the water pumps of the first and second phases meet the water demand of the original three generating sets.

[0004] However, the water for the auxiliary machines such as the bearing cooling water of the air supply fan of the generating set, the bearing cooling water of the induced draft fan and the heating and air cooling cooling water is generally supplied by the production fire-fighting water pipe network directly. If the external pipe network fails and needs to be repaired, the production fire-fighting water needs to be stopped for repair, which results in no cooling water for the auxiliary system. If the pipe in the factory area fails, the production fire-fighting water needs to be stopped for repair, which also results in no cooling water for the auxiliary system. The single water supply system has defects in maintaining the cooling water supply of the auxiliary system, and there is no space to build in the water pump houses of the first, second and third phases. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a two-way water supply system for auxiliary machines of a subcritical generating set, which sets two water supply ways for the cooling of the auxiliary machines, improves the safety factor of water supply and is convenient to construct.

[0006] A two-way water supply system for auxiliary machines of a subcritical generating set, comprising: a second-phase pool, a third-phase pool, a communication pipe, a first water supply pipe and a second water supply pipe, the communication pipe communicates the second-phase pool and the third-phase pool, the communication pipe is communicated with the first water supply pipe, the first water supply pipe is communicated with the auxiliary machines, the second water supply pipe is communicated with the production fire-fighting water pipe network of the factory area, and the auxiliary machine cooling water inlet pipe is further communicated with the second water supply pipe.

[0007] In one of the embodiments, the communication pipe communicates the low position of the second-phase pool and the low position of the third-phase pool, and the height of the lowest position of the communication position of the communication pipe with the second-phase pool is less than 0.5 meters compared with the height of the pool bottom of the second-phase pool.

[0008] In one of the embodiments, the first water supply pipe is communicated with the low part of the communicating pipe, and the communication part of the first water supply pipe with the communicating pipe is less than 0.5 meters from the lowest part of the communicating pipe.

[0009] In one of the embodiments, the communicating pipe is provided with a communicating valve, which is close to the second water pool, and the communication part of the first water supply pipe with the communicating pipe is close to the third water pool.

[0010] In one of the embodiments, the two-way water supply system for auxiliary machines of the subcritical generator set further comprises a first water pool, the first water pool, the second water pool and the third water pool are arranged in sequence, the first water pool is communicated with a first water supply main pipe, the second water pool is communicated with a second water supply main pipe, the third water pool is communicated with a third water supply main pipe, the first water supply main pipe is communicated with the first generator set, the second water supply main pipe is communicated with the second generator set, the third water supply main pipe is communicated with the third generator set and the new generator set; the first water supply main pipe is communicated with the second water supply main pipe, and a first water supply valve is arranged between the first water supply main pipe and the second water supply main pipe; the second water supply main pipe is communicated with the third water supply main pipe, and a second water supply valve is arranged between the second water supply main pipe and the third water supply main pipe.

[0011] In one of the embodiments, the first generator set is communicated with a first cooling tower through a first backwater main pipe, the second generator set is communicated with a second cooling tower through a second backwater main pipe, the third generator set and the new generator set are communicated with a third cooling tower 34 through a third backwater main pipe, the first backwater main pipe is communicated with the second backwater main pipe, and a first backwater valve is arranged between the first backwater main pipe and the second backwater main pipe; the second backwater main pipe is communicated with the third backwater pipe, and a second backwater valve is arranged between the second backwater main pipe and the third backwater pipe.

[0012] In one of the embodiments, the first water supply pipe is provided with a water supply pump at a section close to the communicating pipe.

[0013] In one of the embodiments, the two-way water supply system for auxiliary machines of the subcritical generator set further comprises a first sensor, a second sensor and a controller, the first sensor is arranged at the outlet end of the water supply pump, the first sensor is connected with the controller, and the second sensor is arranged at the water taking end of the second water supply pipe.

[0014] In one of the embodiments, the first water supply pipe and the second water supply pipe are communicated, and then communicated with the auxiliary machine through an auxiliary water supply pipe, and further comprising a buffer pool, the first water supply pipe, the second water supply pipe, the auxiliary water supply pipe and the buffer pool are communicated.

[0015] In one of the embodiments, the first water supply pipe is provided with a first one-way valve at a section close to the buffer pool, and the second water supply pipe is provided with a second one-way valve at a section close to the buffer pool.

[0016] Compared with the prior art, the subcritical generator unit auxiliary machine two-way water supply system has the following advantages:

[0017] The auxiliary machine cooling system increases one water supply, water is supplied to the auxiliary machine from the communication pipe of the second-stage water pool and the third-stage water pool, one of the two water supplies can be switched to the other to supply water when one of the two water supplies fails, and the safety of the auxiliary machine water supply is ensured; the water taking place does not occupy the third-stage water suction well and the third-stage water pump house, construction is convenient, and upgrading and reconstruction on the original equipment are facilitated.

[0018] The utility model will become more clear through the following description and combining with the drawings, these drawings are used to explain the utility model embodiment. DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the utility model embodiment or prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to these drawings without paying creative labor for the ordinary skilled in the art.

[0020] Fig. 1 It is the structure schematic view of the subcritical generator unit auxiliary machine two-way water supply system of the utility model embodiment;

[0021] Fig. 2 It is the local structure schematic view of the subcritical generator unit auxiliary machine two-way water supply system of the utility model embodiment;

[0022] Fig. 3 It is Fig. 2 The enlarged structure schematic view of A in the figure.

[0023] 1, the first-stage generator unit, 11, the first-stage water pool, 12, the first-stage water supply main pipe, 13, the first-stage backwater main pipe, 14, the first-stage cooling tower, 2, the second-stage generator unit, 21, the second-stage water pool, 22, the second-stage water supply main pipe, 23, the second-stage backwater main pipe, 24, the second-stage cooling tower, 3, the third-stage generator unit, 31, the third-stage water pool, 32, the third-stage water supply main pipe, 33, the third-stage backwater main pipe, 34, the third-stage cooling tower, 4, the newly added generator unit, 40, the communication pipe, 41, the first water supply pipe, 42, the second water supply pipe, 43, the buffer water pool, 431, the first one-way valve, 432, the second one-way valve, 44, the water supply pump, 45, the water supply valve, 46, the auxiliary machine water supply pipe, 51, the first water supply valve, 52, the second water supply valve, 53, the first backwater valve, 54, the second backwater valve, 61, the first sensor, 62, the second sensor, 7, the auxiliary machine. DETAILED DESCRIPTION

[0024] Embodiments of the present application will now be described with reference to the accompanying drawings.

[0025] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] As Figs. 1 to 3 shown, the present application subcritical generator set auxiliary two-way water supply system, including three phase unit, first pool 11, second pool 21, third pool 31 in turn, first pool 11 is communicated with first water supply main pipe 12, second pool 21 is communicated with second water supply main pipe 22, third pool 31 is communicated with third water supply main pipe 32, first water supply main pipe 12 and first generator set 1 are communicated, second water supply main pipe 22 and second generator set 2 are communicated, third water supply main pipe 32 and third generator set 3 are communicated, and are communicated with new generator set 4;First water supply main pipe 12 and second water supply main pipe 22 are communicated and a first water supply valve 51 is arranged between the two;Second water supply main pipe 22 and third water supply main pipe 32 are communicated and a second water supply valve 52 is arranged between the two. By adjusting the opening of the first water supply valve 51 and the second water supply valve 52, the water supply to the first generator set 1, the second generator set 2, the third generator set 3 and the new generator set 4 can be adjusted as a whole.

[0028] The first-stage generator set 1 is communicated with the first-stage cooling tower 14 through a first-stage backwater mother pipe 13, the second-stage generator set 2 is communicated with the second-stage cooling tower 24 through a second-stage backwater mother pipe 23, the third-stage generator set 3 and the newly-added generator set 4 are communicated with the third-stage cooling tower 34 through a third-stage backwater mother pipe 33, the first-stage backwater mother pipe 13 is communicated with the second-stage backwater mother pipe 23 and a first backwater valve 53 is arranged between the first-stage backwater mother pipe 13 and the second-stage backwater mother pipe 23, the second-stage backwater mother pipe 23 is communicated with the third-stage backwater mother pipe 33 and a second backwater valve 54 is arranged between the second-stage backwater mother pipe 23 and the third-stage backwater mother pipe 33. By adjusting the opening degrees of the first backwater valve 53 and the second backwater valve 54, the backwater entering the first-stage cooling tower 14, the second-stage cooling tower 24 and the third-stage cooling tower 34 is adjusted, and the cooling capacity of the existing cooling tower is fully utilized.

[0029] The two-way water supply system for the auxiliary machine of the subcritical generator set further comprises a second-stage water pool 21, a third-stage water pool 31, a communication pipe 40, a first water supply pipe 41 and a second water supply pipe 42. The communication pipe 40 communicates the second-stage water pool 21 and the third-stage water pool 31. The communication pipe 40 is communicated with the first water supply pipe 41. The first water supply pipe 41 is communicated with the auxiliary machine 7. The second water supply pipe 42 is communicated with the production fire-fighting water pipe network of the plant area. The cooling water inlet pipe of the auxiliary machine 7 is further communicated with the second water supply pipe 42. The communication pipe 40 supplies water to the auxiliary machine 7 through the second-stage water pool 21 and the third-stage water pool 31. On the one hand, the auxiliary machine 7 has two water supply ways to choose from, which can save water and switch to the other way to supply water when one of the two ways cannot supply water, thereby ensuring the safety of the water supply of the auxiliary machine 7. On the other hand, the water intake location does not occupy the third-stage water suction well and the third-stage water pump house, which is convenient for construction and beneficial for upgrading and reconstruction on the original equipment. Moreover, if the water is directly supplied from the third-stage water pool 31, there are two disadvantages. First, the water needs to be taken from the third-stage water suction well through a hole, which is relatively expensive and is prone to leakage if the waterproofing of the hole is not good. Second, the water level of the third-stage water pool 31 is originally low for supplying the newly-added generator set 4, which is not conducive to ensuring the safety of the water supply.

[0030] The communication pipe 40 communicates the low position of the second-stage water pool 21 and the low position of the third-stage water pool 31. The height H2 of the communication position of the communication pipe 40 with the second-stage water pool 21 relative to the lowest position of the communication pipe 40 is less than 0.5 meters. The first-stage water pool 11, the second-stage water pool 21 and the third-stage water pool 31 are arranged in sequence. The communication pipe 40 arranged at the low position of the second-stage water pool 21 can make the water of the second-stage water pool 21 pass to the third-stage water pool 31 as much as possible, thereby balancing the water level and ensuring the third-stage water supply.

[0031] The first water supply pipe 41 is communicated with the low position of the communication pipe 40. The height H2 of the communication position of the first water supply pipe 41 with the communication pipe 40 relative to the lowest position of the communication pipe 40 is less than 0.5 meters. The first water supply pipe 41 takes water from the low position of the communication pipe 40, which can make the best use of the water of the second-stage water pool 21 and the third-stage water pool 31.

[0032] The communication pipe 40 is provided with a communication valve, the communication valve is close to the second water pool 21, and the first water supply pipe 41 is close to the third water pool 31 at the communication position of the first water supply pipe 41 and the communication pipe 40. If the first water supply pipe 41 cannot be cut off due to failure, and the water supply of the second water pool 21 is insufficient, the communication valve is closed in time, and the water supply of the cooling water of the first generator set 1 and the second generator set 2 is preferentially guaranteed.

[0033] The first water supply pipe 41 is provided with a water supply pump 44 and a water supply valve 45 at a section close to the communication pipe 40, and the water supply valve 45 is located upstream of the water supply pump 44.

[0034] The first water supply pipe 41 is communicated with the second water supply pipe 42, and then communicated with the auxiliary machine 7 through an auxiliary machine water supply pipe 46. The embodiment further comprises a buffer water pool 43, and the first water supply pipe 41, the second water supply pipe 42 and the auxiliary machine water supply pipe 46 are communicated with the buffer water pool 43. By arranging the buffer water pool 43, a higher liquid level is maintained in the buffer water pool 43, which is used for buffering the water pressure fluctuation caused by switching the water supply between the first water supply pipe 41 and the second water supply pipe 42, realizing smooth switching of the water supply, and effectively guaranteeing the water supply safety of the auxiliary machine 7. And through the laying of the first water supply pipe 41 and the second water supply pipe 42, the buffer water pool 43 can be constructed at a suitable address in the factory area, so as to avoid the space of the third water pump house and the third water suction well, thereby facilitating the construction and being beneficial to the upgrading and reconstruction on the existing equipment.

[0035] The first water supply pipe 41 is provided with a first one-way valve 431 at a section close to the buffer water pool 43, and the second water supply pipe 42 is provided with a second one-way valve 432 at a section close to the buffer water pool 43. When the water supply is switched between the first water supply pipe 41 and the second water supply pipe 42, it is usually due to the fact that one of the water supply pressures cannot be supplied and needs to be switched to the other one for water supply. The first one-way valve 431 and the second one-way valve 432 can buffer the water pressure impact caused by switching, and can also avoid the impact of the water pressure of the switched water supply on the valve on the pipe for exiting the water supply, thereby guaranteeing the normal opening and closing of the valve.

[0036] The two-way water supply system of the subcritical generator set auxiliary machine further comprises a first sensor 61, a second sensor 62 and a controller. The first sensor 61 is arranged at the outlet end of the water supply pump 44, the first sensor 61 is connected with the controller, and the second sensor 62 is arranged at the water taking end of the second water supply pipe 42. The first sensor 61 is used for detecting the water pressure or water flow of the first water supply pipe 41, and the second sensor 62 is used for detecting the water pressure or water flow of the second water supply pipe 42. For example, when it is detected that the water pressure or water flow of the first water supply pipe 41 is up to standard, the first water supply pipe 41 is continuously maintained for supplying water to the auxiliary machine 7; and when it is detected that the water pressure or water flow of the first water supply pipe 41 is not up to standard, the second water supply pipe 42 is switched to supply water to the auxiliary machine 7.

[0037] The utility model is described above in combination with the best embodiment, but the utility model is not limited to the above disclosed embodiment, and should cover various modifications, equivalent combinations according to the essence of the utility model.

Claims

1. A subcritical generating unit auxiliary machine two-way water supply system, characterized in that, Comprise: The second water supply pipe is communicated with the factory production fire-fighting water pipe network, and the auxiliary machine cooling water inlet pipe is also communicated with the second water supply pipe.

2. The subcritical generator unit auxiliary machine two-way water supply system according to claim 1, characterized in that, The communication pipe communicates the low position of the second water pool with the low position of the third water pool, and the height of the communication position of the communication pipe with the second water pool is less than 0.5 meters compared with the lowest position of the second water pool.

3. The subcritical generator unit auxiliary two-way water supply system according to claim 1, characterized in that, The first water supply pipe is communicated with the low position of the communication pipe, and the height of the communication position of the first water supply pipe with the communication pipe is less than 0.5 meters compared with the lowest position of the communication pipe.

4. The subcritical generator unit auxiliary two-way water supply system according to claim 1, characterized in that, The communication pipe is provided with a communication valve, the communication valve is close to the second water pool, and the communication position of the first water supply pipe with the communication pipe is close to the third water pool.

5. The subcritical generator unit auxiliary two-way water supply system according to claim 1, characterized in that, Also comprising a first water pool, the first water pool, the second water pool, and the third water pool are arranged in sequence, the first water pool is communicated with a first water supply main pipe, the second water pool is communicated with a second water supply main pipe, and the third water pool is communicated with a third water supply main pipe, the first water supply main pipe is communicated with a first generator set, the second water supply main pipe is communicated with a second generator set, the third water supply main pipe is communicated with a third generator set and a new generator set; the first water supply main pipe is communicated with the second water supply main pipe, and a first water supply valve is arranged between the first water supply main pipe and the second water supply main pipe; the second water supply main pipe is communicated with the third water supply main pipe, and a second water supply valve is arranged between the second water supply main pipe and the third water supply main pipe.

6. The subcritical generator unit auxiliary two-way water supply system according to claim 5, characterized in that, The first generator set is communicated with a first cooling tower through a first backwater main pipe, the second generator set is communicated with a second cooling tower through a second backwater main pipe, the third generator set and the new generator set are communicated with a third cooling tower (34) through a third backwater main pipe, the first backwater main pipe is communicated with the second backwater main pipe, and a first backwater valve is arranged between the first backwater main pipe and the second backwater main pipe; the second backwater main pipe is communicated with the third backwater main pipe, and a second backwater valve is arranged between the second backwater main pipe and the third backwater main pipe.

7. The subcritical generator unit auxiliary two-way water supply system according to claim 1, characterized in that, The first water supply pipe is provided with a water supply pump at a section close to the communication pipe.

8. The subcritical generator unit auxiliary two-way water supply system according to claim 7, characterized in that, Also comprising a first sensor, a second sensor, and a controller, the first sensor is arranged at the outlet end of the water supply pump, the first sensor is connected with the controller, and the second sensor is arranged at the water taking end of the second water supply pipe.

9. The two-way water supply system for auxiliary machines of a subcritical generating unit according to any one of claims 1 to 8, characterized in that, The first water supply pipe and the second water supply pipe are communicated, and then communicated with an auxiliary machine through an auxiliary machine water supply pipe, and a buffer pool is further arranged, the first water supply pipe, the second water supply pipe, the auxiliary machine water supply pipe, and the buffer pool are communicated.

10. The subcritical generator unit auxiliary two-way water supply system according to claim 9, characterized in that, The first water supply pipe is provided with a first check valve at a section close to the buffer pool, and the second water supply pipe is provided with a second check valve at a section close to the buffer pool.

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