Carbon black tail gas waste heat recovery heating system
By designing a carbon black tail gas waste heat recovery heating system, a closed-loop circulation system consisting of a spray tower, spray pump, filter, and plate heat exchanger was adopted. This solved the problems of low waste heat recovery rate and blockage in carbon black tail gas, achieving stable and efficient heating water production, reducing operating costs and generating economic benefits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-03-13
AI Technical Summary
The waste heat recovery and reuse rate of carbon black tail gas during carbon black production is low, resulting in high operating costs for subsequent users. Furthermore, the carbon black tail gas is prone to blockage during cooling, leading to a decrease in heat exchange efficiency.
Design a carbon black tail gas waste heat recovery heating system, which uses a spray tower, spray pump, filter, plate heat exchanger and electric heat pump to form a closed loop, uses the waste heat of carbon black tail gas to produce heating water, and solves the problem of carbon black particle blockage by direct spray cooling.
This improved the utilization rate of waste heat from carbon black exhaust gas, reduced system operating costs, enhanced system stability, and generated economic benefits.
Smart Images
Figure CN223992300U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of carbon black production technology, and in particular to a carbon black tail gas waste heat recovery and heating system. Background Technology
[0002] Currently, the general process for producing carbon black involves using gaseous hydrocarbons, liquid hydrocarbons, or mixtures thereof as raw materials, supplying an appropriate amount of air, and conducting incomplete combustion and pyrolysis at high temperatures in a reactor. The resulting carbon black is suspended in the flue gas, and after cooling, collection, granulation, and drying, it is transported to a finished product warehouse for further packaging and storage. The main component of finished carbon black is carbon. Carbon black is dispersed in the base materials of rubber, inks, coatings, or plastics to impart reinforcing properties, blackness, or electrical conductivity.
[0003] The conventional process of carbon black production is as follows: Combustion air enters the reactor via the main blower, air preheater, and hot air duct; combustion gas (usually coke oven gas) enters the reactor via the pressurized blower; carbon black oil enters the reactor via the feed oil pump and feed oil preheater; and the carbon black flue gas after reaction enters the main bag filter after being cooled down by heat exchange in stages via the air preheater, primary waste heat boiler, feed oil preheater, and secondary waste heat boiler.
[0004] Currently, the carbon black production process consumes a large amount of natural gas or coke oven gas, while also generating a significant amount of carbon black tail gas. This tail gas contains substantial amounts of carbon black dust, CO, hydrogen sulfide, and other toxic and harmful substances. The calorific value of carbon black tail gas is approximately 4000 kJ / m³, making it usable as fuel and possessing some economic value. Typically, the freshly produced carbon black tail gas, at approximately 200°C, is quenched with hot water before being delivered to users. This method significantly increases the water vapor content in the tail gas, resulting in relatively fewer combustible components and a lower calorific value. This not only prevents waste heat recovery and reuse but also increases operating costs for subsequent users. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as low recycling rate of carbon black tail gas waste heat and high subsequent user operating costs, and to provide a carbon black tail gas waste heat recovery heating system. This system is reasonably designed, has a simple structure, adopts a direct spray cooling method, and can utilize the waste heat of carbon black tail gas to produce heating water. This not only improves the stability of system operation but also enhances economic efficiency. The overall operating cost of carbon black tail gas is low, making it suitable for widespread application.
[0006] This utility model is achieved through the following technical solution: a carbon black tail gas waste heat recovery heating system, including a spray tower, with a carbon black tail gas inlet at the bottom and a carbon black tail gas outlet at the top, meaning the carbon black tail gas enters from the bottom of the spray tower and exits from the top; a spray pump is connected to the water outlet at the bottom of the spray tower, the inlet of the spray pump is connected to the bottom of the spray tower via a pipe, and a first heat exchanger is connected to the outlet of the spray pump; the hot-side inlet of the first heat exchanger is connected to the outlet of the spray pump via a pipe, and a second heat exchanger is connected to the hot-side outlet of the first heat exchanger; the hot-side inlet of the second heat exchanger... The outlet of the first heat exchanger is connected to the hot-side outlet of the second heat exchanger via a pipe, and the hot-side outlet of the second heat exchanger is connected to an electric heat pump. The inlet of the evaporator of the electric heat pump is connected to the hot-side outlet of the second heat exchanger via a pipe, and the outlet of the evaporator is connected to the spray water inlet at the top of the spray tower via a pipe. The cold-side inlet of the first heat exchanger is connected to the main heating water pipe, and the cold-side outlet of the first heat exchanger is connected to the main heating water supply pipe. The cold-side inlet of the second heat exchanger is connected to the main heating water pipe, and the cold-side outlet of the second heat exchanger is connected to the inlet of the condenser of the electric heat pump. The outlet of the condenser is connected to the main heating water supply pipe via a pipe.
[0007] The spray tower, spray pump, filter, first heat exchanger, second heat exchanger, and electric heat pump described in this system form a closed-loop cycle, which can utilize the waste heat of carbon black tail gas to produce heating water in winter. In addition, this system adopts a direct spray cooling method, which can effectively solve the problem of reduced heat exchange effect caused by carbon black particle blockage during the cooling process of carbon black tail gas, and greatly improve the stability of system operation.
[0008] A further improvement of this invention is that the hot-side outlet of the first heat exchanger is connected via a pipe to a condensate treatment device for treating condensate. This design solves the problem of condensate treatment.
[0009] A further improvement of this utility model is that a filter is provided between the spray pump and the first heat exchanger, that is, the inlet of the filter is connected to the outlet of the spray pump through a pipe, and the outlet of the filter is connected to the hot side inlet of the first heat exchanger through a pipe.
[0010] A further improvement of this invention is that the inlet temperature of the spray water at the top of the spray tower is 32-35℃. By selecting this temperature range, staff can ensure a good cooling effect on the carbon black exhaust gas.
[0011] A further improvement of this invention is that the hot-side outlet temperature of the second heat exchanger is 42-45℃. By selecting this temperature range, operators can reduce the power consumption of the electric heat pump.
[0012] A further improvement of this invention is that the heat exchange tubes of the evaporator of the electric heat pump are made of 316L or duplex steel, and the outlet temperature of the condenser of the electric heat pump is 60-62℃. The aforementioned 316L or duplex steel has strong resistance to acid corrosion and chloride ion corrosion, and by selecting the above temperature range, operators can ensure that the heating water temperature meets the standards.
[0013] A further improvement of this invention is that both the first and second heat exchangers are plate heat exchangers made of 316L steel or duplex steel. Plate heat exchangers are highly efficient heat exchangers, and 316L steel or duplex steel has strong resistance to acid corrosion and chloride ion corrosion.
[0014] As can be seen from the above technical solutions, the beneficial effects of this utility model are as follows: The spray tower, spray pump, filter, first heat exchanger, second heat exchanger, and electric heat pump of this system constitute a closed-loop cycle, which can utilize the waste heat of carbon black tail gas to produce heating water in winter, thereby selling the heating heat as a commodity and generating considerable economic benefits. Furthermore, this system adopts a direct spray cooling method, which can effectively solve the problem of reduced heat exchange efficiency caused by carbon black particle blockage during the carbon black tail gas cooling process, greatly improving the stability of system operation. Moreover, the investment in this system is moderate, and the overall operating cost is lower. Attached Figure Description
[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.
[0017] In the diagram: 1. Spray tower; 2. Spray pump; 3. First heat exchanger; 4. Second heat exchanger; 5. Electric heat pump; 501. Evaporator; 502. Condenser; 6. Main heating water supply pipeline; 7. Main heating water supply pipeline; 8. Condensate treatment device; 9. Filter. Detailed Implementation
[0018] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.
[0019] Please refer to the attached document. Figure 1 The following is a description of a specific embodiment: The carbon black tail gas waste heat recovery heating system of this utility model includes a spray tower 1 (referring to existing spray towers). The bottom of the spray tower 1 has a carbon black tail gas inlet, and the top of the spray tower 1 has a carbon black tail gas outlet, meaning the carbon black tail gas enters from the bottom of the spray tower 1 and exits from the top. A spray pump 2 is connected to the water outlet at the bottom of the spray tower 1. The inlet of the spray pump 2 is connected to the bottom of the spray tower 1 via a pipe, and the outlet of the spray pump 2 is connected to a filter 9. The inlet of the filter 9 is connected to the outlet of the spray pump 2 via a pipe, and the outlet of the filter 9 is connected to a first heat exchanger 3. The hot-side inlet of the first heat exchanger 3 is connected to the outlet of the filter 9 via a pipe, and the hot-side outlet of the first heat exchanger 3 is connected to a second heat exchanger 4. The hot-side inlet of the second heat exchanger 4 is connected to the hot-side outlet of the first heat exchanger 3 via a pipe, and the hot-side outlet of the second heat exchanger 4 is connected to an electric heat pump 5.
[0020] Specifically, both the first heat exchanger 3 and the second heat exchanger 4 are plate heat exchangers made of 316L steel or duplex steel. Plate heat exchangers are highly efficient heat exchangers, and 316L steel or duplex steel has strong resistance to acid corrosion and chloride ion corrosion.
[0021] Specifically, the hot-side outlet temperature of the second heat exchanger 4 is 42-45℃. By selecting this temperature range, operators can reduce the power consumption of the electric heat pump 5.
[0022] The inlet of the evaporator 501 of the electric heat pump 5 is connected to the hot side outlet of the second heat exchanger 4 through a pipe, and the outlet of the evaporator 501 is connected to the spray water inlet at the top of the spray tower 1 through a pipe.
[0023] Specifically, the heat exchange tubes of the evaporator 501 of the electric heat pump 5 are made of 316L or duplex steel, and the outlet temperature of the condenser 502 of the electric heat pump 5 is 60-62℃. The aforementioned 316L or duplex steel has strong resistance to acid corrosion and chloride ion corrosion, and by selecting the above temperature range, the operator can ensure that the heating water temperature meets the standard.
[0024] Specifically, the inlet temperature of the spray water at the top of spray tower 1 is 32-35℃. By selecting this temperature range, staff can ensure a good cooling effect on the carbon black exhaust gas.
[0025] The cold-side inlet of the first heat exchanger 3 is connected to the main heating water pipe 6, and the cold-side outlet of the first heat exchanger 3 is connected to the main heating water supply pipe 7. The cold-side inlet of the second heat exchanger 4 is connected to the main heating water supply pipe 6, and the cold-side outlet of the second heat exchanger 4 is connected to the inlet of the condenser 502 of the electric heat pump 5. The outlet of the condenser 502 is connected to the main heating water supply pipe 7 via a pipe. The hot-side outlet of the first heat exchanger 3 is connected to a condensate treatment device 8 for treating condensate via a pipe.
[0026] The operating principle of this utility model is as follows: The spray tower 1, spray pump 2, filter 9, first heat exchanger 3, second heat exchanger 4, and electric heat pump 5 constitute a closed-loop cycle. In winter, the waste heat from carbon black tail gas can be used to produce heating water, which can then be sold as a commodity, generating considerable economic benefits. Furthermore, this system employs a direct spray cooling method, effectively solving the problem of reduced heat exchange efficiency caused by carbon black particle blockage during carbon black tail gas cooling, greatly improving the stability of system operation. Moreover, the system has a moderate investment and lower overall operating costs.
[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A carbon black tail gas waste heat recovery heating system comprising a spray tower (1), characterized in that, The bottom of the spray tower (1) is provided with a carbon black tail gas input port, and the top of the spray tower (1) is provided with a carbon black tail gas output port, that is, the carbon black tail gas enters from the bottom of the spray tower (1) and is discharged from the top of the spray tower (1); the water outlet at the bottom of the spray tower (1) is connected with a spray pump (2), the inlet of the spray pump (2) is connected with the water outlet at the bottom of the spray tower (1) through a pipeline, and the outlet of the spray pump (2) is connected with a first heat exchanger (3); the hot side inlet of the first heat exchanger (3) is connected with the outlet of the spray pump (2) through a pipeline, and the hot side outlet of the first heat exchanger (3) is connected with a second heat exchanger (4); the hot side inlet of the second heat exchanger (4) is connected with the hot side outlet of the first heat exchanger (3) through a pipeline, and the hot side outlet of the second heat exchanger (4) is connected with an electric heat pump (5); the inlet of the evaporator (501) of the electric heat pump (5) is connected with the hot side outlet of the second heat exchanger (4) through a pipeline, and the outlet of the evaporator (501) is connected with the spray water inlet at the top of the spray tower (1) through a pipeline; The cold side inlet of the first heat exchanger (3) is connected with a heating water supply main pipeline (6), and the cold side outlet of the first heat exchanger (3) is connected with a heating water supply main pipeline (7); the cold side inlet of the second heat exchanger (4) is connected with the heating water supply main pipeline (6), and the cold side outlet of the second heat exchanger (4) is connected with the inlet of the condenser (502) of the electric heat pump (5), and the outlet of the condenser (502) is connected with the heating water supply main pipeline (7) through a pipeline.
2. The carbon black tail gas waste heat recovery heating system according to claim 1, characterized in that, The hot side outlet of the first heat exchanger (3) is connected with a condensate water treatment device (8) for treating condensate water through a pipeline.
3. The carbon black tail gas waste heat recovery heating system according to claim 1 or 2, characterized in that, A filter (9) is arranged between the spray pump (2) and the first heat exchanger (3), that is, the inlet of the filter (9) is connected with the outlet of the spray pump (2) through a pipeline, and the outlet of the filter (9) is connected with the hot side inlet of the first heat exchanger (3) through a pipeline.
4. The carbon black tail gas waste heat recovery heating system according to claim 3, characterized in that, The temperature of the spray water inlet at the top of the spray tower (1) is 32-35℃.
5. The carbon black tail gas waste heat recovery heating system according to claim 4, characterized in that, The temperature of the hot side outlet of the second heat exchanger (4) is 42-45℃.
6. The carbon black tail gas waste heat recovery heating system according to claim 5, characterized in that, The heat exchange pipe of the evaporator (501) of the electric heat pump (5) is made of 316L or duplex steel, and the outlet temperature of the condenser (502) of the electric heat pump (5) is 60-62℃.
7. The carbon black tail gas waste heat recovery heating system according to claim 6, characterized in that, Both the first heat exchanger (3) and the second heat exchanger (4) are plate heat exchangers, and the material thereof is 316L or duplex steel.