Boiler flue gas waste heat utilization device

Abstract

The utility model relates to the technical field of boiler waste heat, in particular to a boiler flue gas waste heat utilization device which comprises a boiler, a chimney and a preheating water tank, a right outlet of the boiler is fixedly communicated with the chimney, a heating coil coiled from bottom to top is arranged on the outer wall of the chimney, and a first inlet in the upper portion of the preheating water tank is fixedly communicated with a water supplementing pipeline. A first treatment pipeline is fixedly communicated between the lower outlet of the preheating water tank and the lower inlet of the heating coil. The device is reasonable and compact in structure and convenient to use, the heating coil, the preheating water tank and the matched pipeline are arranged on the boiler chimney, process water in the preheating water tank is heated through waste heat of the chimney, and the process water is sent out after the temperature detector detects that the temperature of the process water meets the production requirement. Flue gas waste heat is effectively recycled, and the problem that heat sources are wasted due to the fact that existing boiler flue gas preheating cannot be recycled is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler waste heat, and is a boiler flue gas waste heat utilization device. Background Art

[0002] Flue gas is the main way for general energy-consuming equipment to waste energy. Recycling and utilizing flue gas waste heat is one of the ways to improve energy utilization. There are many ways to recycle and utilize waste heat. Generally speaking, comprehensive utilization of waste heat is the best, followed by direct utilization, and then indirect utilization (such as waste heat power generation). Comprehensive utilization is to utilize waste heat in a step-by-step manner according to the quality of the waste heat and the order of temperature. High-quality waste heat can be used in production processes or waste heat power generation; medium-quality waste heat (120 to 160 degrees) can be used with ammonia absorption refrigeration equipment to produce cooling capacity of -30 to 5 degrees for air conditioning or industry; low-temperature waste heat can be used for heating or use absorption heat pumps to increase the amount of heat or temperature for production and daily use.

[0003] During the production process, boilers are used to heat and dry raw materials. The exhaust gas temperature is relatively high, and direct discharge leads to waste of resources. At the same time, during the production and processing of products, there are certain requirements for the process water temperature, which needs to be heated. Heating the process water again increases energy consumption, and the waste heat cannot be directly utilized. Summary of the Invention

[0004] The utility model provides a boiler flue gas waste heat utilization device, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem of heat source waste caused by the inability to recycle the waste heat of the existing boiler flue gas.

[0005] The technical solution of the present utility model is achieved through the following measures: a boiler flue gas waste heat utilization device, comprising a boiler, a chimney and a preheating water tank, the right outlet of the boiler is fixedly connected to the chimney, a heating coil coiled from bottom to top is provided on the outer wall of the chimney, a first inlet on the upper part of the preheating water tank is fixedly connected to a water supply pipeline, a first treatment pipeline is fixedly connected between the lower outlet of the preheating water tank and the lower inlet of the heating coil, a second treatment pipeline is fixedly connected between the upper outlet of the heating coil and the second inlet on the upper part of the preheating water tank, a preheating water tank outlet is fixedly connected to a preheating water delivery pipeline, a temperature monitor and a liquid level detector are provided on the preheating water tank, an electric delivery pump 1 is fixedly installed on the preheating water delivery pipeline, and an interlock is provided between the temperature monitor and the electric delivery pump 1.

[0006] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0007] The first processing pipeline is fixedly connected to a drain pipeline, and a drain valve is fixedly installed on the drain pipeline.

[0008] An electric control valve is fixedly installed on the water supply pipeline, and a second electric delivery pump is fixedly installed on the first treatment pipeline.

[0009] The liquid level detector is interlocked with the electric control valve and the electric delivery pump 2 respectively.

[0010] The heating coil is provided with heat-insulating cotton.

[0011] The utility model has a reasonable and compact structure and is easy to use. A heating coil, a preheating water tank and supporting pipelines are arranged on the chimney of the boiler, so that the process water in the preheating water tank is heated by the waste heat of the chimney and then returned to the preheating water tank. When the temperature detector detects that the process water temperature reaches the production requirement, it is sent out, which effectively solves the problem of heat source waste caused by the inability to recycle the waste heat of the flue gas of the existing boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attachment Figure 1 This is a schematic diagram of the process flow of the best embodiment of the utility model.

[0013] The codes in the accompanying drawings are: 1 for boiler, 2 for chimney, 3 for preheating water tank, 4 for heating coil, 5 for water supply pipeline, 6 for first treatment pipeline, 7 for second treatment pipeline, 8 for preheating water delivery pipeline, 9 for temperature detector, 10 for liquid level detector, 11 for electric delivery pump 1, 12 for electric delivery pump 2, 13 for electric control valve, 14 for drain valve, and 15 for drain pipeline. DETAILED DESCRIPTION

[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0015] In this utility model, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The positional relationships of front, back, top, bottom, left, and right are described in the layout of the manual. Figure 1 The layout direction is determined by the

[0016] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0017] As attached Figure 1As shown, the boiler flue gas waste heat utilization device includes a boiler 1, a chimney 2 and a preheating water tank 3. The right outlet of the boiler 1 is fixedly connected to the chimney 2. A heating coil 4 is provided on the outer wall of the chimney 2 and is coiled from bottom to top. A water supply pipeline 5 is fixedly connected to the first inlet of the upper part of the preheating water tank 3. A first treatment pipeline 6 is fixedly connected between the lower outlet of the preheating water tank 3 and the lower inlet of the heating coil 4. A second treatment pipeline 7 is fixedly connected between the upper outlet of the heating coil 4 and the second inlet of the upper part of the preheating water tank 3. The outlet of the preheating water tank 3 is fixedly connected to a preheating water delivery pipeline 8. A temperature monitor 9 and a liquid level detector 10 are provided on the preheating water tank 3. An electric delivery pump 11 is fixedly installed on the preheating water delivery pipeline 8. An interlock is provided between the temperature monitor 9 and the electric delivery pump 11.

[0018] The utility model provides a heating coil 4, a preheating water tank 3 and supporting pipelines on the chimney 2 of the boiler 1, so that the process water in the preheating water tank 3 is heated by the waste heat of the chimney 2 and then returned to the preheating water tank 3. When the temperature detector 9 detects that the process water temperature reaches the production requirement, it is sent out, which effectively solves the problem of heat source waste caused by the inability to recycle the waste heat of the flue gas of the existing boiler 1.

[0019] The above-mentioned boiler flue gas waste heat utilization device can be further optimized and / or improved according to actual needs:

[0020] As attached Figure 1 As shown, the first processing pipeline 6 is fixedly connected to an emptying pipeline 15, and an emptying valve 14 is fixedly installed on the emptying pipeline 15. Through such an arrangement, the process water in the heating coil 4 can be emptied through the emptying pipeline 15 when the operation is stopped.

[0021] As attached Figure 1 As shown, an electric control valve 13 is fixedly installed on the water supply pipeline 5, and an electric delivery pump 12 is fixedly installed on the first treatment pipeline 6.

[0022] As attached Figure 1 As shown, the liquid level detector 10 is interlocked with the electric control valve 13 and the electric delivery pump 2 12. This arrangement enables automatic control. When the liquid level detector 10 detects that the liquid level in the preheating water tank 3 has dropped to the minimum set value, the interlocked electric control valve 13 opens, and water is added to the preheating water tank 3 through the water supply line 5. When the liquid level detector 10 detects that the liquid level in the preheating water tank 3 has reached the maximum set value, the interlocked electric delivery pump 2 12 opens, and the process water in the preheating water tank 3 is heated by the heating coil 4 of the chimney 2 before being delivered to the preheating water tank 3.

[0023] As required, the heating coil 4 is provided with heat-insulating cotton. By such arrangement, both the flue gas waste heat loss can be prevented and, simultaneously, the overly high temperature can be prevented from causing harm to the staff members.

[0024] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

[0025] The usage process of the best embodiment of the present utility model is as follows: when the temperature detector 9 detects that the temperature of the process water in the preheating water tank 3 reaches the production requirement, the process water is directly delivered to the production workshop through the preheating water delivery pipeline 8; when the temperature monitor 9 detects that the process water in the preheating water tank 3 is lower than the production requirement, the process water is delivered to the heating coil 4 through the first treatment pipeline 6 for heating, and then delivered to the preheating water tank 3 through the second treatment pipeline 7; when the temperature monitor 9 detects that the temperature of the process water in the preheating water tank 3 is higher than the production requirement, cold water is added to the preheating water tank 3 through the water supply pipeline 5 to make it reach the production requirement temperature.

Claims

1. A boiler flue gas waste heat utilization device, characterized in that It includes a boiler, a chimney and a preheating water tank. The right outlet of the boiler is fixedly connected to the chimney. A heating coil is provided on the outer wall of the chimney and is wound from bottom to top. The first inlet on the upper part of the preheating water tank is fixedly connected to a water supply pipeline. The lower outlet of the preheating water tank and the lower inlet of the heating coil are fixedly connected to a first treatment pipeline. The upper outlet of the heating coil and the second inlet on the upper part of the preheating water tank are fixedly connected to a second treatment pipeline. The outlet of the preheating water tank is fixedly connected to a preheating water delivery pipeline. The preheating water tank is provided with a temperature monitor and a liquid level detector. An electric delivery pump is fixedly installed on the preheating water delivery pipeline. An interlock is provided between the temperature monitor and the electric delivery pump.

2. The boiler flue gas waste heat utilization device according to claim 1, characterized in that The first processing pipeline is fixedly connected with an exhaust pipeline, and an exhaust valve is fixedly installed on the exhaust pipeline.

3. The boiler flue gas waste heat utilization device according to claim 1 or 2, characterized in that An electric control valve is fixedly installed on the water supply pipeline, and a second electric delivery pump is fixedly installed on the first treatment pipeline.

4. The boiler flue gas waste heat utilization device according to claim 3, characterized in that The liquid level detector is interlocked with the electric control valve and the electric delivery pump.

5. The boiler flue gas waste heat utilization device according to claim 1, 2 or 4, characterized in that The heating coil is provided with heat-insulating cotton.

6. The boiler flue gas waste heat utilization device according to claim 3, characterized in that The heating coil is provided with heat-insulating cotton.

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