A bell-type furnace low-temperature waste heat utilization device and a method of using the same

Abstract

The present invention relates to a device for utilizing low-temperature waste heat of a bell-type furnace and a method for using the device, and belongs to the technical field of bell-type furnaces. The device is mainly composed of a bell-type furnace body, a pressureless return water tank, a return water pump, a water replenishment system, a heating system and a heating system. The water replenishment system is mainly composed of a cooling tower, a water collection tank and a water supply pump; the heating system is mainly composed of a water supply pipe, an air conditioning terminal and a return water pipe; and the heating system is mainly composed of a heating pipe. Method of using the device: The cooling water of the bell-type furnace body flows into the pressureless return water tank by gravity, and the return water pump transports the cooling water in the pressureless return water tank to the water replenishment system, the heating system and the heating system respectively. The water replenishment system is used for cooling the bell-type furnace body and replenishing water for the system; the heating system is used for air conditioning heating; and the heating system is used for heating circulating water. The present invention realizes the reuse of waste heat of cooling water of the bell-type furnace body through the mutual cooperation of the water replenishment system, the heating system and the heating system, thereby saving resources.

Description

Technical Field

[0001] The present invention belongs to the technical field of bell-type furnaces, and in particular, relates to a bell-type furnace low-temperature waste heat utilization device and a use method thereof. Background Art

[0002] At present, bell-type furnaces are usually cooled by water cooling. The water temperature after cooling is very high. Usually, the water after cooling the bell-type furnace is transported to a pressure-free return water pool, and then the water is transported to a cooling tower for cooling through a return water pump. Then, it is pressurized by a water supply pump and sent back to the bell-type furnace for bell-type furnace cooling, forming a recycling of cooling water. However, in this way, the heat energy of the high-temperature cooling water cannot be utilized.

[0003] Considering that most factories are equipped with water system central air conditioning, the working principle of water system central air conditioning is that the evaporator in the air conditioner transfers the heat of hot water to the air, and the fan blows the hot air into the room to increase the indoor air temperature. The low-temperature water after heat release flows back to the heating device through the return pipe for heating, and the cycle is repeated to achieve the purpose of heating. The central air conditioning system requires a stable hot water medium, and the hood furnace cooling produces a large amount of high-temperature cooling water. How to connect the pipeline of the hood furnace cooling water system with the pipeline of the central air conditioning circulating water system to achieve full utilization of resources is the core of the research of this invention. Summary of the invention

[0004] The object of the present invention is to provide a device for utilizing low-temperature waste heat of a bell-type furnace and a method for using the same, so as to solve the problems raised in the background technology.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A device for utilizing low-temperature waste heat of a hood-type furnace comprises a hood-type furnace body, a water outlet end of the hood-type furnace body is connected to a pressureless return water tank, a water outlet end of the pressureless return water tank is connected to a return water pump, a four-way pipe is provided at the output end of the return water pump, a first interface of the four-way pipe is connected to the output end of the return water pump, a second interface of the four-way pipe is provided with a water replenishment system, a water outlet end of the water replenishment system is connected to a water inlet end of the hood-type furnace body, a third interface of the four-way pipe is provided with a heating system, a water outlet end of the heating system is connected to a water inlet end of the pressureless return water tank, a fourth interface of the four-way pipe is provided with a heating system, a water outlet end of the heating system is connected to a water inlet end of the hood-type furnace body, and a first valve, a second valve and a third valve are respectively installed between the four-way pipe and the water replenishment system, the heating system and the heating system.

[0007] Furthermore, the hood-type furnace body includes a cooling hood, a furnace inner hood is installed inside the cooling hood, a furnace platform is provided at the bottom of the furnace inner hood, a plurality of spray pipes are fixed to the top of the inner part of the cooling hood, a water outlet is provided on one side of the lower part of the cooling hood, a water inlet is provided on one side of the furnace platform, and a water outlet is provided at the bottom of the furnace platform.

[0008] Furthermore, the spray pipe is an annular structure, which ensures that the spray range of the spray pipe is maximized.

[0009] Furthermore, the water replenishment system includes a cooling tower, and the water inlet end of the cooling tower includes a first water inlet and a second water inlet opened adjacent to each other, the first water inlet of the cooling tower is connected to the second interface of the four-way pipe, the second water inlet of the cooling tower is connected to the industrial water pipe of the factory area, the water outlet end of the cooling tower is connected to a water collecting tank, the water outlet end of the water collecting tank is connected to a water supply pump, the output end of the water supply pump is provided with a three-way pipe, the first interface of the three-way pipe is connected to the output end of the water supply pump, the second interface of the three-way pipe is connected to the water inlet end of the furnace, and a fourth valve is installed between the third interface of the three-way pipe and the spray pipe on one side of the cooling hood.

[0010] Furthermore, the heating system includes an air conditioning terminal, the water inlet of the air conditioning terminal is connected to a water supply pipe, the water supply pipe is connected to the third interface of the four-way pipe, the water outlet of the air conditioning terminal is connected to a return pipe, and the return pipe is connected to a pressure-free return water tank.

[0011] Furthermore, the heating system includes a heating pipe, one end of the heating pipe is connected to the fourth interface of the four-way pipe, and the other end of the heating pipe is connected to the spray pipe on the other side of the cooling hood.

[0012] Furthermore, a method for using a bell-type furnace low-temperature waste heat utilization device comprises the following steps:

[0013] Step S1: Start the bell-type furnace body, then fully open the first valve and the fourth valve, half open the third valve, close the second valve, and finally start the return water pump;

[0014] Step S2: Monitor the return water pump outlet temperature. When the temperature is between 60-80°C, fully open the second valve and continue to monitor the return water pump outlet temperature. When the return water pump outlet temperature is lower than 60°C, adjust the third valve to fully open, and adjust the first valve and the fourth valve to half open; when the return water pump outlet temperature is higher than 80°C, adjust the third valve to close, and adjust the first valve and the fourth valve to fully open.

[0015] Beneficial effects of the present invention:

[0016] On the basis of recycling the cooling water of the bell-type furnace, the present invention first further refines the cooling process of the cooling water and sets up a water replenishment system, which is used for cooling the bell-type furnace body and replenishing water for the system, thereby ensuring efficient cooling of the bell-type furnace body and water balance of the entire system; then a heating system is set up, and the heating system uses the cooling water after the bell-type furnace body is cooled as the hot water medium of the central air-conditioning of the plant water system, thereby achieving full utilization of resources; finally, a heating system is set up, and the purpose of setting the heating system is to recycle the bell-type furnace body to heat the cooling water.

[0017] When heating is needed, by controlling the first valve, the fourth valve of the water supply system and the third valve of the heating system, the efficient cooling of the hood-type furnace body is guaranteed while the heating rate of the cooling water in the pressureless return water pool is increased. When the water temperature reaches 60°C, the second valve of the heating system is opened and the heating system starts to heat the air conditioner. The low-temperature cooling water after air conditioning heating enters the pressureless return water pool. By adjusting the opening of the first valve, the fourth valve of the water supply system and the third valve of the heating system, the water temperature in the pressureless return water pool is always maintained at 60-80°C, ensuring the stability of the water temperature at the input end of the air conditioning and heating system. The water supply system, the heating system and the heating system are interrelated.

[0018] The present invention realizes the reuse of the waste heat of cooling water of the bell-type furnace body through the mutual cooperation of the water replenishment system, the heating system and the heating system, thereby saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 The present invention is a schematic structural diagram of a device for utilizing low-temperature waste heat of a bell-type furnace.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Hood-type furnace body; 11. Cooling hood; 12. Furnace inner hood; 13. Furnace table; 14. Spray pipe; 2. Pressureless return water tank; 3. Return water pump; 4. Four-way pipe; 5. Water supply system; 51. First valve; 52. Cooling tower; 521. First water inlet; 522. Second water inlet; 53. Water collecting tank; 54. Water supply pump; 55. Three-way pipe; 56. Fourth valve; 6. Heating system; 61. Second valve; 62. Water supply pipe; 63. Air conditioning terminal; 64. Return water pipe; 7. Heating system; 71. Third valve; 72. Heating pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 As shown, a device for utilizing low-temperature waste heat of a bell-type furnace comprises a bell-type furnace body 1, the bell-type furnace body 1 comprises a cooling hood 11, a furnace inner hood 12 is installed inside the cooling hood 11, a furnace platform 13 is arranged at the bottom of the furnace inner hood 12, spray water inlets are arranged on both sides of the upper part of the cooling hood 11, two layers of spray pipes 14 are fixedly installed on the inner wall of the cooling hood 11, the spray water inlets on both sides of the cooling hood 11 are connected with the corresponding spray pipes 14, the spray pipes 14 spray cooling water for cooling the furnace inner hood 12, the spray pipes 14 are annular structures, the annular structure ensures that the spray range of the spray pipes 14 fully covers the furnace inner hood 12, the spray ranges of the two layers of spray pipes 14 do not affect each other, a water outlet is arranged on one side of the lower part of the cooling hood 11, and the water outlet of the cooling hood 11 is connected to the inner wall of the cooling hood 11. The pressure return water tank 2 is connected by a pipeline, a water inlet end is provided on one side of the furnace platform 13, a water outlet end is provided at the lower end of the furnace platform 13, a non-pressure return water tank 2 is provided on one side of the hood-type furnace body 1, the water outlet end of the furnace platform 13 is connected with the non-pressure return water tank 2 through a pipeline, the water outlet end of the cooling hood 11 and the water outlet end of the furnace platform 13 are located above the ground, and the non-pressure return water tank 2 is located below the ground, and the cooling water enters the non-pressure return water tank 2 from the water outlet end of the cooling hood 11 and the water outlet end of the furnace platform 13 by gravity, a return water pump 3 is provided on one side of the non-pressure return water tank 2, the input end of the return water pump 3 is connected with the bottom of the non-pressure return water tank 2 through a pipeline, and a four-way pipe 4 is provided on the output end side of the return water pump 3, and the first interface of the four-way pipe 4 is connected with the output end of the return water pump 3 through a pipeline.

[0025] The second interface of the four-way pipe 4 is connected to a water replenishment system 5, and the water replenishment system 5 includes a cooling tower 52. The cooling tower 52 uses water and air flow to exchange heat to generate steam, and the steam evaporates and takes away heat, thereby reducing the temperature of the circulating water. A first water inlet 521 and a second water inlet 522 are adjacent to one side of the cooling tower 52, wherein the first water inlet 521 is connected to the second interface of the four-way pipe 4 through a pipeline, and a first valve 51 is provided on the pipeline between the first water inlet 521 and the second interface of the four-way pipe 4, and the first valve 51 is used to control the water intake of the water replenishment system 5; wherein the second water inlet 522 is connected to the industrial water pipe of the factory area, and the water in the hood-type furnace body 1, the pressureless return water tank 2, the heating system 6 and the heating system 7 will be gradually consumed over time. The industrial water pipes passing through the factory area are used to ensure the water balance of the whole set of equipment. A water outlet is provided on the other side of the cooling tower 52. The water outlet is connected to a water collecting tank 53 through a pipeline. A water supply pump 54 is arranged on one side of the water collecting tank 53. The input end of the water supply pump 54 is connected to the bottom of the water collecting tank 53 through a pipeline. A tee pipe 55 is provided on the output end side of the water supply pump 54. The first interface of the tee pipe 55 is connected to the output end of the water supply pump 54 through a pipeline, and the second interface of the tee pipe 55 is connected to the cooling water inlet of the furnace table 13 through a pipeline. The third interface of the tee pipe 55 is connected to the spray water inlet on one side of the upper part of the cooling hood 11 through a pipeline. A fourth valve 56 is provided on the pipeline. The water supply pump 54 is used to send the circulating water in the water collecting tank 53 into the hood-type furnace body 1, which is used for cooling the furnace table 13 and the hood 12 in the furnace.

[0026] The third interface of the four-way pipe 4 is connected to the heating system 6, and the heating system 6 includes an air-conditioning terminal 63. The air-conditioning terminal 63 has a water inlet and a water outlet on both sides. The water inlet side of the air-conditioning terminal 63 is connected with a water supply pipe 62. The water supply pipe 62 is connected to the third interface of the four-way pipe 4 through a pipeline. A second valve 61 is provided on the pipeline. The second valve 61 is used to control the water inlet amount of the heating system 6. A boosting device can be set on the pipeline between the second valve 61 and the water supply pipe 62. Preferably, a boosting pump is selected to regulate the water pressure in the pipeline. The water outlet side of the air-conditioning terminal 63 is connected with a return pipe 64. The return pipe 64 is connected to the pressureless return water tank 2 through a pipeline. The air-conditioning terminal 63 is used for heating a specific room. The water supply pipe 62 and the return pipe 64 can be used as heating pipes. Through the cooperation of the water supply pipe 62, the air-conditioning terminal 63 and the return pipe 64, the heat can be fully utilized.

[0027] The fourth interface of the four-way pipe 4 is connected to the heating system 7, which includes a heating pipe 72. The outer wall of the heating pipe 72 is provided with an insulation layer, and the insulation layer is made of rock wool. One end of the heating pipe 72 is connected to the fourth interface of the four-way pipe 4, and the other end of the heating pipe 72 is connected to the spray water inlet on the other side of the cooling hood 11. The heating pipe 72 is provided with a third valve 71, and the third valve 71 is used to control the water intake of the heating system 7. The heating system 7 directly returns the water of the pressureless return water tank 2 to the hood-type furnace body 1. Without being cooled by the cooling tower 52 of the water replenishment system 5, the water temperature inside the heating system 7 will gradually increase with the increase of the number of cycles. By regulating the heating system 7 and the water replenishment system 5, the water temperature in the pressureless return water tank 2 can be regulated, and then the water inlet temperature of the heating system 6 can be regulated.

[0028] A method for using a bell-type furnace low-temperature waste heat utilization device comprises the following steps:

[0029] Step S1: Start the bell-type furnace body 1, then fully open the first valve 51 and the fourth valve 56, half open the third valve 71, close the second valve 61, and finally start the return water pump 3;

[0030] Step S2: Monitor the outlet water temperature of the return pump 3. When the temperature reaches 70°C, fully open the second valve 61 and continue to monitor the outlet water temperature of the return pump 3. When the outlet water temperature of the return pump 3 is lower than 60°C, adjust the third valve 71 to fully open, and adjust the first valve 51 and the fourth valve 56 to half open; when the outlet water temperature of the return pump 3 is higher than 80°C, adjust the third valve 71 to close, and adjust the first valve 51 and the fourth valve 56 to fully open.

[0031] Working principle of the present invention:

[0032] After the bell-type furnace body 1 in the present invention is started, the first valve 51 is opened synchronously, the fourth valve 56 is opened, the third valve 71 is half-opened, and the second valve 61 is closed, and then the return water pump 3 is started, and the cooling water is continuously transported from the pressureless return water tank 2 to the water supply system 5 and the heating system 7 through the action of the return water pump 3. Among them, in the water replenishment system 5, the cooling water enters the water collecting tank 53 after being cooled and released by the cooling tower 52. When the cooling water in the whole system is seriously lost, industrial water is supplemented into the cooling tower 52. The industrial water and cooling water are collected and then sent into the hood-type furnace body 1 through the work of the water supply pump 54, which is used for cooling the hood 12 and the furnace table 13 in the furnace. The cooling water after absorbing heat flows into the pressureless return water tank 2 by gravity; wherein, in the heating system 7, the cooling water directly enters the hood-type furnace body 1 through the pipeline, which is used for cooling the hood 12 in the furnace. The cooling water after absorbing heat flows into the pressureless return water tank 2 by gravity. No cooling equipment is set in the heating system 7. As the heating system 7 circulates, the water temperature in the pressureless return water tank 2 will gradually increase. The water temperature of the cooling water in the return water tank can be regulated by regulating the water replenishment system 5 and the heating system 7.

[0033] When the outlet water temperature of the return pump 3 is between 60 and 80°C, the second valve 61 is fully opened. At this time, the cooling water enters the heating system 6, and then flows through the water supply pipe 62, the air conditioning terminal 63 and the return pipe 64 and enters the pressureless return water tank 2. The water supply pipe 62, the air conditioning terminal 63 and the return pipe 64 are used for heating in specific places. The cooling water after heating enters the pressureless return water tank 2. The water temperature of the cooling water in the pressureless return water tank 2 gradually decreases. When the outlet water temperature of the return pump 3 is lower than 60°C, the third valve 71 is adjusted to the full opening, and the first valve 51 and the fourth valve 56 are adjusted to the half opening. At this time, most of the water output from the return pump 3 enters the heating system 7 and the heating system 6. As the circulation proceeds, the water temperature of the pressureless return water tank 2 gradually increases. When the water output temperature of the return pump 3 is higher than 80°C, the third valve 71 is regulated to be closed, and the first valve 51 and the fourth valve 56 are regulated to be fully opened. At this time, most of the water output from the return pump 3 enters the water replenishment system 5 and the heating system 6. As the circulation proceeds, the water temperature of the pressureless return water tank 2 gradually decreases. By regulating the opening of the first valve 51, the second valve 61, the third valve 71 and the fourth valve 56, the water temperature of the heating system 7 is guaranteed to be stable.

[0034] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A device for utilizing low-temperature waste heat of a bell-type furnace, comprising a bell-type furnace body (1), a water outlet of the bell-type furnace body (1) being connected to a pressureless return water tank (2), a water outlet of the pressureless return water tank (2) being connected to a return water pump (3), a four-way pipe (4) being provided at the output end of the return water pump (3), a first interface of the four-way pipe (4) being connected to the output end of the return water pump (3), a water replenishment system (5) being provided at the second interface of the four-way pipe (4), a water outlet of the water replenishment system (5) being connected to a water inlet of the bell-type furnace body (1), characterized in that: A heating system (6) is provided at the third interface of the four-way pipe (4), and a water outlet of the heating system (6) is connected to a water inlet of the pressure-free return water tank (2). A heating system (7) is provided at the fourth interface of the four-way pipe (4), and a water outlet of the heating system (7) is connected to a water inlet of the bell-type furnace body (1). A first valve (51), a second valve (61), and a third valve (71) are installed between the four-way pipe (4) and the water supply system (5), the heating system (6), and the heating system (7), respectively. The water replenishment system (5) comprises a cooling tower (52), the water inlet end of the cooling tower (52) comprises a first water inlet (521) and a second water inlet (522) which are adjacent to each other, the first water inlet (521) of the cooling tower (52) is connected to the second interface of the four-way pipe (4), the second water inlet (522) of the cooling tower (52) is connected to an industrial water pipe in the factory area, the water outlet end of the cooling tower (52) is connected to a water collecting tank (53), and the water outlet end of the water collecting tank (53) is connected to a water supply A pump (54), an output end of the water supply pump (54) is provided with a three-way pipe (55), a first interface of the three-way pipe (55) is communicated with the output end of the water supply pump (54), a second interface of the three-way pipe (55) is communicated with the water inlet end of the furnace table (13), a third interface of the three-way pipe (55) is communicated with a spray pipe (14) on one side of the cooling hood (11), and a fourth valve (56) is installed between the third interface of the three-way pipe (55) and the spray pipe (14) on one side of the cooling hood (11); The heating system (6) comprises an air conditioning terminal (63), the water inlet end of the air conditioning terminal (63) is connected to a water supply pipe (62), the water supply pipe (62) is connected to the third interface of the four-way pipe (4), the water outlet end of the air conditioning terminal (63) is connected to a return pipe (64), and the return pipe (64) is connected to the pressureless return water tank (2); The heating system (7) comprises a heating pipe (72), one end of the heating pipe (72) being in communication with the fourth interface of the four-way pipe (4), and the other end of the heating pipe (72) being in communication with the spray pipe (14) on the other side of the cooling hood (11).

2. The device for utilizing low-temperature waste heat of a bell-type furnace according to claim 1, characterized in that: The hood-type furnace body (1) comprises a cooling hood (11), a furnace inner hood (12) is installed inside the cooling hood (11), a furnace platform (13) is provided at the bottom of the furnace inner hood (12), a plurality of spray pipes (14) are fixed to the top of the interior of the cooling hood (11), a water outlet is provided on one side of the lower part of the cooling hood (11), a water inlet is provided on one side of the furnace platform (13), and a water outlet is provided at the bottom of the furnace platform (13).

3. The device for utilizing low-temperature waste heat of a bell-type furnace according to claim 2, characterized in that: The spray pipe (14) is a ring-shaped structure.

4. The method for using the device for utilizing low-temperature waste heat of a bell-type furnace according to claim 1, characterized in that: The following steps are involved: Step S1: start the bell-type furnace body (1), then fully open the first valve (51) and the fourth valve (56), half open the third valve (71), close the second valve (61), and finally start the return water pump (3); Step S2: monitoring the outlet water temperature of the return water pump (3); when the temperature is between 60°C and 80°C, fully opening the second valve (61); continuing to monitor the outlet water temperature of the return water pump (3); when the outlet water temperature of the return water pump (3) is lower than 60°C, regulating the third valve (71) to fully open, and regulating the first valve (51) and the fourth valve (56) to half open; when the outlet water temperature of the return water pump (3) is higher than 80°C, regulating the third valve (71) to close, and regulating the first valve (51) and the fourth valve (56) to fully open.

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