Efficient heat recovery device and method based on raw gas conversion

Abstract

The invention relates to the technical field of coal chemical industry heat recovery, in particular to a high-efficiency heat recovery device and method based on raw gas shift, and the device comprises a front boiler, a raw gas shift device, a desalted water heater, a first waste heat boiler, a first gas-liquid separator, a deaerator and a desalted water preheating device, a second raw gas pipeline is communicated between the front boiler and the raw gas conversion device, a first deep change gas pipeline is communicated between the raw gas conversion device and the desalted water heater, and a second deep change gas pipeline is communicated between the desalted water heater and the first gas-liquid separator; a third deep change gas pipeline is communicated between the first deep change gas pipeline and the first waste heat boiler, and a fifth deep change gas pipeline is communicated between the first gas-liquid separator and the desalted water preheating device. According to the invention, a heat exchange medium required by raw gas conversion can be met, and desalted water condensate heat energy is distributed to generate steam, so that efficient recycling of heat is achieved.

Description

Technical Field

[0001] This invention relates to the field of coal chemical heat recovery technology, and is a high-efficiency heat recovery device and method based on crude gas conversion. Background Technology

[0002] In the field of coal chemical industry, the crude coal gas shift reaction is one of the core reactions. Its main function is to react the large amount of carbon monoxide (CO) in crude coal gas with water (H2O) to produce hydrogen (H2) and carbon dioxide (CO2), thereby adjusting the H2 / CO ratio in the coal gas and providing qualified feedstock gas for subsequent synthesis of ammonia, methanol, ethylene glycol and other products.

[0003] The main reaction in the crude gas shift reaction is a reversible exothermic reaction, with the reaction equation: CO + H₂O(g) ⇌ CO₂ + H₂, where the heat of reaction ΔH° = −41.1 kJ / mol. The mechanism of the crude gas shift reaction is relatively complex, and its specific pathway is closely related to the reaction conditions (temperature, pressure) and the type of catalyst. A coal chemical plant uses a chromium-molybdenum catalyst for the crude gas shift reaction. To meet the catalyst activity temperature requirements of this shift reaction process, the inlet temperature of the feed gas (crude gas) needs to be adjusted. Therefore, heat exchange equipment and a large amount of heat exchange medium are required to control the inlet temperature. The crude gas shift reaction releases a large amount of heat during the reaction, and the generated shift gas is a high-temperature shift gas. It needs to be cooled before entering the downstream gas separation system for gas separation, which also requires heat exchange equipment and a large amount of circulating water as the heat exchange medium for the high-temperature shift gas.

[0004] Currently, existing crude gas conversion processes require a large amount of heat exchange medium (circulating water or other heat exchange media) for heat exchange. This not only results in high costs for the required heat exchange medium but also leads to ineffective utilization of the heat of the conversion reaction, thus wasting heat. Furthermore, existing crude gas conversion processes cannot achieve on-demand allocation of the heat energy from the heat exchange condensate.

[0005] In summary, the existing crude gas shift reaction process suffers from high costs of the required heat exchange medium and low thermal energy utilization of the heat exchange condensate, which have become urgent technical challenges for enterprises to solve. Summary of the Invention

[0006] This invention provides a high-efficiency heat recovery device and method based on crude gas conversion, which overcomes the shortcomings of the prior art and can effectively solve the problems of high cost of heat exchange medium and low heat energy utilization rate of heat exchange condensate in the existing crude gas conversion reaction process.

[0007] One of the technical solutions of this invention is achieved through the following measures: a high-efficiency heat recovery device based on crude gas conversion, comprising a pre-boiler, a crude gas conversion device, a demineralized water heater, a first waste heat boiler, a first gas-liquid separator, a deaerator, and a demineralized water preheating device. A first crude gas pipeline is fixedly connected to the inlet of the pre-boiler. A second crude gas pipeline is fixedly connected between the outlet of the pre-boiler and the first inlet of the crude gas conversion device. A first deep gas conversion pipeline is fixedly connected between the outlet of the crude gas conversion device and the inlet of the demineralized water heater. The demineralized water heater... A second deep gas-changing pipeline is fixedly connected between the outlet and the upper inlet of the first gas-liquid separator; a third deep gas-changing pipeline is fixedly connected between the first deep gas-changing pipeline and the inlet of the first waste heat boiler; a fourth deep gas-changing pipeline is fixedly connected between the outlet of the first waste heat boiler and the second deep gas-changing pipeline; a fifth deep gas-changing pipeline is fixedly connected between the top outlet of the first gas-liquid separator and the inlet of the demineralized water preheating device; a sixth deep gas-changing pipeline is fixedly connected between the outlet of the demineralized water preheating device and the top inlet of the deaerator; and a first condensate pipeline is fixedly connected between the top outlet of the demineralized water preheating device and the top inlet of the deaerator.

[0008] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: A second condensate pipeline is fixedly connected between the bottom outlet of the deaerator and the second inlet of the crude gas conversion device. A third condensate pipeline is fixedly connected between the second condensate pipeline and the bottom inlet of the first waste heat boiler. A first low-grade steam pipeline is fixedly connected to the top outlet of the first waste heat boiler. A fourth condensate pipeline is fixedly connected between the second condensate pipeline between the third condensate pipeline and the second inlet of the crude gas conversion device and the bottom inlet of the demineralized water heater. A fifth condensate pipeline is fixedly connected between the top outlet of the demineralized water heater and the top inlet of the pre-fired boiler. A first high-grade steam pipeline is fixedly connected to the top outlet of the pre-fired boiler. A sixth condensate pipeline is fixedly connected between the fifth condensate pipeline and the third inlet of the crude gas conversion device.

[0009] The aforementioned crude gas conversion device includes a second gas-liquid separator, a crude gas heater, a first conversion furnace, a medium-pressure waste heat boiler, a second conversion furnace, a second waste heat boiler, and a third gas-liquid separator. A second crude gas pipeline is fixedly connected between the top outlet of the pre-fired boiler and the upper inlet of the second gas-liquid separator. A third crude gas pipeline is fixedly connected between the top outlet of the second gas-liquid separator and the inlet of the crude gas heater. A fourth crude gas pipeline is fixedly connected between the outlet of the crude gas heater and the top inlet of the first conversion furnace. A first conversion gas pipeline is fixedly connected between the bottom outlet of the first conversion furnace and the bottom inlet of the crude gas heater. The top outlet of the crude gas heater is connected to the medium-pressure waste heat boiler. A second shift gas pipeline is fixedly connected between the top inlet of the furnace and the bottom outlet of the medium-pressure waste heat boiler and the top inlet of the second shift boiler. A third shift gas pipeline is fixedly connected between the bottom outlet of the second shift boiler and the inlet of the second waste heat boiler. A seventh deep shift gas pipeline is fixedly connected between the outlet of the second waste heat boiler and the upper inlet of the third gas-liquid separator. A second condensate pipeline is fixedly connected between the bottom outlet of the deaerator and the bottom inlet of the second waste heat boiler. A second low-grade steam pipeline is fixedly connected between the top outlet of the second waste heat boiler and the inlet of the demineralized water heater. A first deep shift gas pipeline is fixedly connected between the top outlet of the third gas-liquid separator and the inlet of the demineralized water heater.

[0010] The aforementioned crude gas conversion unit also includes a superheater and a steam drum. A fourth conversion gas pipeline is fixedly connected between the first conversion gas pipeline and the superheater inlet. A fifth conversion gas pipeline is fixedly connected between the superheater outlet and the second conversion gas pipeline. A heat source input pipeline is fixedly connected between the lower outlet of the second converter and the bottom inlet of the steam drum. A heat source return pipeline is fixedly connected between the top outlet of the steam drum and the upper inlet of the second converter. A sixth condensate pipeline is fixedly connected between the fifth condensate pipeline and the top inlet of the steam drum. A high-grade steam pipeline is fixedly connected to the bottom outlet of the steam drum. A seventh condensate pipeline is fixedly connected between the sixth condensate pipeline and the inlet of the medium-pressure waste heat boiler. A high-grade saturated steam pipeline is fixedly connected between the outlet of the medium-pressure waste heat boiler and the bottom inlet of the superheater. A high-grade superheated steam pipeline is fixedly connected to the top outlet of the superheater.

[0011] The aforementioned demineralized water preheating device includes a first demineralized water preheater and a second demineralized water preheater. A fifth deep gas-changing pipeline is fixedly connected between the top outlet of the first gas-liquid separator and the inlet of the first demineralized water preheater. A ninth deep gas-changing pipeline is fixedly connected between the outlet of the first demineralized water preheater and the inlet of the second demineralized water preheater. A sixth deep gas-changing pipeline is fixedly connected between the outlet of the second demineralized water preheater. A first demineralized water input pipeline is fixedly connected between the top inlet of the second demineralized water preheater. A second demineralized water input pipeline is fixedly connected between the bottom inlet of the first demineralized water preheater and the second demineralized water input pipeline. An eighth condensate pipeline is fixedly connected between the bottom outlet of the second demineralized water preheater and the second demineralized water input pipeline. A first condensate pipeline is fixedly connected between the top outlet of the first demineralized water preheater and the top inlet of the deaerator.

[0012] The aforementioned high-efficiency heat recovery device based on crude gas conversion also includes a third waste heat boiler, a tenth deep gas conversion pipeline is fixedly connected between the third deep gas conversion pipeline and the inlet of the third waste heat boiler, an eleventh deep gas conversion pipeline is fixedly connected between the outlet of the third waste heat boiler and the second deep gas conversion pipeline between the outlet of the demineralized water heater and the fourth deep gas conversion pipeline, a ninth condensate pipeline is fixedly connected between the second condensate pipeline between the fourth condensate pipeline and the third condensate pipeline and the bottom inlet of the third waste heat boiler, and a third low-grade steam pipeline is fixedly connected to the top outlet of the third waste heat boiler.

[0013] The aforementioned high-efficiency heat recovery device based on crude gas conversion also includes a circulating water heat exchanger and an ammonia washing tower. The outlet of the second demineralized water preheater is fixedly connected to the circulating water heat exchanger via a sixth deep gas conversion pipeline. The outlet of the circulating water heat exchanger is fixedly connected to the upper inlet of the ammonia washing tower via a twelfth deep gas conversion pipeline. The bottom inlet of the circulating water heat exchanger is fixedly connected to a circulating water input pipeline. The top outlet of the circulating water heat exchanger is fixedly connected to a circulating water output pipeline. The top of the ammonia washing tower is fixedly connected to a thirteenth deep gas conversion pipeline.

[0014] A first control valve is fixedly installed on the third deep gas pipeline between the first deep gas pipeline and the tenth deep gas pipeline, and a second control valve is fixedly installed on the fourth condensate pipeline.

[0015] A third control valve is fixedly installed on the third condensate pipeline, and a fourth control valve is fixedly installed on the ninth condensate pipeline.

[0016] The second technical solution of the present invention is achieved through the following measures: a method for efficient heat recovery based on crude gas conversion, comprising: S01, the crude coal gas enters the pre-fired boiler and exchanges heat with the high-temperature demineralized condensate produced from the top of the demineralized water heater to obtain high-grade steam and condensed crude coal gas. S02, the condensed crude gas enters the crude gas conversion unit for conversion reaction, including: crude gas gas-liquid separation, crude gas heat exchange and temperature increase, crude gas conversion reaction, conversion gas heat exchange and temperature decrease, conversion gas deep conversion reaction, deep conversion gas heat exchange and temperature decrease, deep conversion gas gas-liquid separation, to obtain the first deep conversion gas. S03, the first deep shift gas enters the demineralized water heater and exchanges heat with the demineralized water condensate from the bottom of the deaerator to obtain the second deep shift gas and high-temperature demineralized water condensate. The high-temperature demineralized water condensate provides heat exchange medium for the pre-boiler and the crude gas shift unit. S04, the second deep shift gas enters the first waste heat boiler and the third waste heat boiler respectively, and exchanges heat with the deoxygenated condensate from the bottom of the deaerator to obtain low-grade steam and the third deep shift gas. S05, the second and third depth shifted gas enter the first gas-liquid separator for gas-liquid separation to obtain the fourth depth shifted gas; S06, the fourth deep shift gas enters the first demineralized water preheater and the second demineralized water preheater in sequence, and exchanges heat with the demineralized water to obtain the fifth deep shift gas and demineralized water condensate. The demineralized water condensate is deoxygenated and defoamed by the deaerator and then provides heat exchange medium for the gas shifting device, the first waste heat boiler and the third waste heat boiler. S07, the fifth deep shift gas enters the circulating water heat exchanger and exchanges heat with the circulating water to obtain circulating water condensate and the sixth deep shift gas. S08, the sixth deep shift gas enters the ammonia washing tower for ammonia absorption, and the resulting seventh deep shift gas goes to the downstream gas separation process system.

[0017] This invention facilitates heat exchange between crude coal gas shift gas and demineralized water, satisfying the heat exchange medium requirements during the crude coal gas shift process and distributing the heat energy of the demineralized water condensate to produce steam at different pressures, thus achieving efficient heat recovery and utilization. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the process flow structure of the present invention.

[0019] The codes in the attached diagram are as follows: 1 is the pre-heater, 2 is the demineralized water heater, 3 is the first waste heat boiler, 4 is the first gas-liquid separator, 5 is the deaerator, 6 is the first crude gas pipeline, 7 is the second crude gas pipeline, 8 is the first deep gas conversion pipeline, 9 is the second deep gas conversion pipeline, 10 is the third deep gas conversion pipeline, 11 is the fourth deep gas conversion pipeline, 12 is the fifth deep gas conversion pipeline, 13 is the sixth deep gas conversion pipeline, 14 is the first demineralized water input pipeline, 15 is the first condensate pipeline, 16 is the second condensate pipeline, and 17 is the third condensate pipeline. Pipelines: 18 is the first low-grade steam pipeline, 19 is the fourth condensate pipeline, 20 is the fifth condensate pipeline, 21 is the sixth condensate pipeline, 22 is the second gas-liquid separator, 23 is the crude gas heater, 24 is the first shift converter, 25 is the medium-pressure waste heat boiler, 26 is the second shift converter, 27 is the second waste heat boiler, 28 is the third gas-liquid separator, 29 is the third crude gas pipeline, 30 is the fourth crude gas pipeline, 31 is the first shift gas pipeline, 32 is the second shift gas pipeline, 33 is the third shift gas pipeline, 34 is the seventh... 35 is the eighth deep-gas pipeline, 36 is the second low-grade steam pipeline, 37 is the liquid discharge pipeline, 38 is the superheater, 39 is the steam drum, 40 is the fourth shifted gas pipeline, 41 is the heat source input pipeline, 42 is the heat source return pipeline, 43 is the second high-grade steam pipeline, 44 is the seventh condensate pipeline, 45 is the high-grade saturated steam pipeline, 46 is the high-grade superheated steam pipeline, 47 is the first demineralized water preheater, 48 is the second demineralized water preheater, 49 is the ninth deep-gas pipeline, 50 is the eighth condensate pipeline, and 5... 1 is the third waste heat boiler, 52 is the tenth deep gas conversion pipeline, 53 is the eleventh deep gas conversion pipeline, 54 is the ninth condensate pipeline, 55 is the third low-grade steam pipeline, 56 is the circulating water heat exchanger, 57 is the ammonia washing tower, 58 is the twelfth deep gas conversion pipeline, 59 is the circulating water input pipeline, 60 is the circulating water output pipeline, 61 is the thirteenth deep gas conversion pipeline, 62 is the first control valve, 63 is the second control valve, 64 is the third control valve, 65 is the fourth control valve, 66 is the first high-grade steam pipeline, and 67 is the fifth gas conversion pipeline. Detailed Implementation

[0020] The present invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solutions and actual conditions of the present invention.

[0021] Unless otherwise specified, all equipment and apparatus used in this invention are existing, publicly known, and commonly used equipment and apparatus in the field.

[0022] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0023] The present invention will be further described below with reference to embodiments: Example 1: As shown in the attached document Figure 1 As shown, this high-efficiency heat recovery device based on crude gas conversion includes a pre-boiler 1, a crude gas conversion device, a demineralized water heater 2, a first waste heat boiler 3, a first gas-liquid separator 4, a deaerator 5, and a demineralized water preheating device. A first crude gas pipeline 6 is fixedly connected to the left inlet of the pre-boiler 1. A second crude gas pipeline 7 is fixedly connected between the right outlet of the pre-boiler 1 and the first inlet of the crude gas conversion device. A first deep gas conversion pipeline 8 is fixedly connected between the outlet of the crude gas conversion device and the left inlet of the demineralized water heater 2. The right outlet of the demineralized water heater 2 is connected to the upper part of the first gas-liquid separator 4. A second deep gas conversion pipeline 9 is fixedly connected between the inlets; a third deep gas conversion pipeline 10 is fixedly connected between the first deep gas conversion pipeline 8 and the left inlet of the first waste heat boiler 3; a fourth deep gas conversion pipeline 11 is fixedly connected between the right outlet of the first waste heat boiler 3 and the second deep gas conversion pipeline 9; a fifth deep gas conversion pipeline 12 is fixedly connected between the top outlet of the first gas-liquid separator 4 and the left inlet of the demineralized water preheating device; a sixth deep gas conversion pipeline 13 is fixedly connected between the right outlet of the demineralized water preheating device; and a first condensate pipeline 15 is fixedly connected between the top outlet of the demineralized water preheating device and the top inlet of the deaerator 5.

[0024] As required, the pre-boiler 1, the demineralized water heater 2, and the first waste heat boiler 3 are all commonly used equipment with heat exchange functions in the coal chemical industry.

[0025] Deaerator 5 can eliminate air bubbles in the condensate water discharged from the demineralized water preheating device, thereby improving the quality of the condensate.

[0026] This invention delivers demineralized water condensate (120°C) from a demineralized water preheating unit to a demineralized water heater 2, where it is heated to 160°C before being fed into a pre-boiler 1 and a crude gas conversion unit. This not only provides the necessary heat exchange medium for the crude gas conversion unit but also produces high-grade steam, low-grade steam, and high-grade superheated steam. High-grade steam has the highest output, and both high-grade and low-grade steam can provide steam feedstock for other production systems. The high-grade superheated steam can be used to power a steam turbine for electricity generation. Furthermore, the demineralized water condensate (120°C) from the preheating unit can also be diverted to a first waste heat boiler 3 for further heat exchange and heating, yielding a large amount of low-grade steam, thus maximizing the recovery and utilization of the heat from the demineralized water condensate (120°C).

[0027] Example 2: As an optimization of the above examples, as shown in the appendix Figure 1As shown, a second condensate pipeline 16 is fixedly connected between the bottom outlet of the deaerator 5 and the second inlet of the crude gas conversion device. A third condensate pipeline 17 is fixedly connected between the second condensate pipeline 16 and the bottom inlet of the first waste heat boiler 3. A first low-grade steam pipeline 18 is fixedly connected to the top outlet of the first waste heat boiler 3. A fourth condensate pipeline 19 is fixedly connected between the second condensate pipeline 16 (between the third condensate pipeline 17 and the second inlet of the crude gas conversion device) and the bottom inlet of the demineralized water heater 2. A fifth condensate pipeline 20 is fixedly connected between the top outlet of the demineralized water heater 2 and the top inlet of the pre-boiler 1. A first high-grade steam pipeline 66 is fixedly connected to the top outlet of the pre-boiler 1. A sixth condensate pipeline 21 is fixedly connected between the fifth condensate pipeline 20 and the third inlet of the crude gas conversion device.

[0028] Example 3: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, the crude gas conversion device includes a second gas-liquid separator 22, a crude gas heater 23, a first converter 24, a medium-pressure waste heat boiler 25, a second converter 26, a second waste heat boiler 27, and a third gas-liquid separator 28. A second crude gas pipeline 7 is fixedly connected between the top outlet of the pre-fired boiler 1 and the upper inlet of the second gas-liquid separator 22. A third crude gas pipeline 29 is fixedly connected between the top outlet of the second gas-liquid separator 22 and the left inlet of the crude gas heater 23. A fourth crude gas pipeline 30 is fixedly connected between the right outlet of the crude gas heater 23 and the top inlet of the first converter 24. A first conversion gas pipeline 31 is fixedly connected between the bottom outlet of the first converter 24 and the bottom inlet of the crude gas heater 23. The top outlet of the crude gas heater 23 is connected to the medium-pressure waste heat boiler 28. A second shift gas pipeline 32 is fixedly connected between the top inlet of boiler 25 and the bottom outlet of medium-pressure waste heat boiler 25 and the top inlet of second shift furnace 26. A third shift gas pipeline 33 is fixedly connected between the bottom outlet of second shift furnace 26 and the left inlet of second waste heat boiler 27. An eighth deep shift gas pipeline 35 is fixedly connected between the right outlet of second waste heat boiler 27 and the upper inlet of third gas-liquid separator 28. A second condensate pipeline 16 is fixedly connected between the bottom outlet of deaerator 5 and the bottom inlet of second waste heat boiler 27. A second low-grade steam pipeline 36 is fixedly connected between the top outlet of second waste heat boiler 27 and the left inlet of demineralized water heater 2. A first deep shift gas pipeline 8 is fixedly connected between the top outlet of third gas-liquid separator 28 and the left inlet of demineralized water heater 2.

[0029] As needed, the bottom of the first gas-liquid separator 4, the second gas-liquid separator 22, and the third gas-liquid separator 28 are all fixedly connected to a liquid discharge pipeline 37 for discharging the liquid after gas-liquid separation.

[0030] Example 4: As an optimization of the above embodiments, as shown in the appendix Figure 1As shown, the crude gas conversion unit also includes a superheater 38 and a steam drum 39. A fourth conversion gas pipeline 40 is fixedly connected between the first conversion gas pipeline 31 and the right inlet of the superheater 38. A fifth conversion gas pipeline 67 is fixedly connected between the left outlet of the superheater 38 and the second conversion gas pipeline 32. A heat source input pipeline 41 is fixedly connected between the lower outlet of the second converter 26 and the bottom inlet of the steam drum 39. A heat source return pipeline is fixedly connected between the top outlet of the steam drum 39 and the upper inlet of the second converter 26. Pipeline 42, the fifth condensate pipeline 20, and the top inlet of the steam drum 39 are fixedly connected to the sixth condensate pipeline 21. The bottom outlet of the steam drum 39 is fixedly connected to the second high-grade steam pipeline 43. The sixth condensate pipeline 21 and the right inlet of the medium-pressure waste heat boiler 25 are fixedly connected to the seventh condensate pipeline 44. The left outlet of the medium-pressure waste heat boiler 25 and the bottom inlet of the superheater 38 are fixedly connected to the high-grade saturated steam pipeline 45. The top outlet of the superheater 38 is fixedly connected to the high-grade superheated steam pipeline 46.

[0031] Example 5: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the demineralized water preheating device includes a first demineralized water preheater 47 and a second demineralized water preheater 48. A fifth deep gas-changing pipeline 12 is fixedly connected between the top outlet of the first gas-liquid separator 4 and the left inlet of the first demineralized water preheater 47. A ninth deep gas-changing pipeline 49 is fixedly connected between the right outlet of the first demineralized water preheater 47 and the left inlet of the second demineralized water preheater 48. A sixth deep gas-changing pipeline 13 is fixedly connected between the right outlet of the second demineralized water preheater 48. A first demineralized water input pipeline 14 is fixedly connected between the top inlet of the second demineralized water preheater 48. A second demineralized water input pipeline 49 is fixedly connected between the bottom inlet of the first demineralized water preheater 47. An eighth condensate pipeline 50 is fixedly connected between the bottom outlet of the second demineralized water preheater 48 and the second demineralized water input pipeline 49. A first condensate pipeline 15 is fixedly connected between the top outlet of the first demineralized water preheater 47 and the top inlet of the deaerator 5.

[0032] Example 6: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the high-efficiency heat recovery device based on crude gas conversion also includes a third waste heat boiler 51, a tenth deep gas conversion pipeline 52 fixedly connected between the third deep gas conversion pipeline 10 and the left inlet of the third waste heat boiler 51, an eleventh deep gas conversion pipeline 53 fixedly connected between the right outlet of the third waste heat boiler 51 and the second deep gas conversion pipeline 9 between the right outlet of the demineralized water heater 2 and the fourth deep gas conversion pipeline 11, a ninth condensate pipeline 54 fixedly connected between the second condensate pipeline 16 between the fourth condensate pipeline 19 and the third condensate pipeline 17 and the bottom inlet of the third waste heat boiler 51, and a third low-grade steam pipeline 55 fixedly connected to the top outlet of the third waste heat boiler 51.

[0033] Example 7: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the high-efficiency heat recovery device based on crude gas conversion also includes a circulating water heat exchanger 56 and an ammonia washing tower 57. The right outlet of the second demineralized water preheater 48 is fixedly connected to the circulating water heat exchanger 56 via a sixth deep gas conversion pipeline 13. The right outlet of the circulating water heat exchanger 56 is fixedly connected to the upper inlet of the ammonia washing tower 57 via a twelfth deep gas conversion pipeline 58. The bottom inlet of the circulating water heat exchanger 56 is fixedly connected to a circulating water input pipeline 59. The top outlet of the circulating water heat exchanger 56 is fixedly connected to a circulating water output pipeline 60. The top of the ammonia washing tower 57 is fixedly connected to a thirteenth deep gas conversion pipeline 61.

[0034] As required, the crude gas heater 23, the medium-pressure waste heat boiler 25, the second waste heat boiler 27, the superheater 38, the steam drum 39, the first demineralized water preheater 47, the second demineralized water preheater 48, the third waste heat boiler 51, and the circulating water heat exchanger 56 are all commonly used equipment with heat exchange functions in the coal chemical industry.

[0035] Example 8: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, a first control valve 62 is fixedly installed on the third deep gas pipeline 10 between the first deep gas pipeline 8 and the tenth deep gas pipeline 52, and a second control valve 63 is fixedly installed on the fourth condensate pipeline 19.

[0036] Example 9: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, a third control valve 64 is fixedly installed on the third condensate line 17, and a fourth control valve 65 is fixedly installed on the ninth condensate line 54.

[0037] Depending on the needs, the pipelines and equipment of this high-efficiency heat recovery device based on crude gas conversion may also be equipped with conventional valves, thermometers and pressure gauges known in the art, as required by production.

[0038] Example 10: As attached Figure 1 The heat recovery method based on crude gas shift shown includes: S01, the crude coal gas enters the pre-boiler 1 and exchanges heat with the high-temperature demineralized condensate produced from the top of the demineralized water heater 2 to obtain high-grade steam and condensed crude coal gas. S02, the condensed crude gas enters the crude gas conversion unit for conversion reaction, including: crude gas gas-liquid separation, crude gas heat exchange and temperature increase, crude gas conversion reaction, conversion gas heat exchange and temperature decrease, conversion gas deep conversion reaction, deep conversion gas heat exchange and temperature decrease, deep conversion gas gas-liquid separation, to obtain the first deep conversion gas. S03, the first deep shift gas enters the demineralized water heater 2 and exchanges heat with the demineralized water condensate from the bottom of the deaerator 5 to obtain the second deep shift gas and high-temperature demineralized water condensate. The high-temperature demineralized water condensate provides heat exchange medium for the pre-boiler 1 and the crude gas shifting unit. S04, the second deep shift gas enters the first waste heat boiler 3 and the third waste heat boiler 51 respectively, and exchanges heat with the deoxygenated condensate from the bottom of the deaerator 5 to obtain low-grade steam and the third deep shift gas. S05, the second and third deep shifted gas enter the first gas-liquid separator 4 together for gas-liquid separation to obtain the fourth deep shifted gas; S06, the fourth deep shift gas enters the first demineralized water preheater 47 and the second demineralized water preheater 48 in sequence, and exchanges heat with the demineralized water to obtain the fifth deep shift gas and demineralized water condensate. The demineralized water condensate is deoxygenated and defoamed by the deaerator 5 and provides heat exchange medium for the gas shifting device, the first waste heat boiler 3 and the third waste heat boiler 51 respectively. S07, the fifth deep shift gas enters the circulating water heat exchanger 56 and exchanges heat with the circulating water to obtain circulating water condensate and the sixth deep shift gas. S08, the sixth deep shift gas enters the ammonia washing tower 57 for ammonia absorption, and the resulting seventh deep shift gas goes to the downstream gas separation process system.

[0039] As needed, in step S02 above, the crude gas shift reaction includes: First, condensed crude gas enters the second gas-liquid separator 22 for gas-liquid separation to obtain dry crude gas; Second, dry crude gas enters the crude gas heater 23 and exchanges heat with the shift gas produced from the bottom of the first shift furnace 24 to obtain high-temperature dry crude gas and first condensed shift gas; Third, high-temperature dry crude gas enters the first shift furnace 24 for crude gas shift reaction to obtain shift gas; Fourth, first condensed shift gas enters the medium-pressure waste heat boiler 25 and exchanges heat with the high-temperature demineralized condensate produced from the top of the demineralized water heater 2 to obtain second condensed shift gas and high-grade saturated steam; Fifth, second condensed shift gas enters the second shift furnace 26 for deep gas shift reaction to obtain first deep shift gas; Sixth, first deep shift gas enters the second waste heat boiler 27 for heat exchange and cooling, then enters the third gas-liquid separator 28 for gas-liquid separation, and finally enters the demineralized water heater 2 in step S03.

[0040] The above-mentioned crude gas conversion reaction also includes: First, the conversion gas produced at the bottom of the first converter 24 enters the superheater 38 and exchanges heat with the high-grade saturated steam produced from the left end of the medium-pressure waste heat boiler 25 to obtain the third condensing conversion gas and high-grade superheated steam. The third condensing conversion gas also enters the medium-pressure waste heat boiler 25 for heat exchange. Second, the reaction heat source produced at the bottom of the second converter 26 enters the steam drum 39 and exchanges heat with the high-temperature demineralized water condensate produced from the top of the demineralized water heater 2 to obtain the condensing reaction heat source and high-grade steam. The condensing reaction heat source is returned to the second converter 26.

[0041] Example 11: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the efficient heat recovery method based on crude gas shift includes: S01, the crude coal gas produced by the upper gasification process system enters the pre-boiler 1 and exchanges heat with the high-temperature demineralized condensate produced from the top of the demineralized water heater 2 to obtain high-grade steam and 235°C condensed crude coal gas. SO2, 235℃ condensed crude gas enters the crude gas shifting unit for shifting reaction. The crude gas shifting reaction includes: crude gas gas-liquid separation, crude gas heat exchange and temperature increase, crude gas shifting reaction, shift gas heat exchange and temperature decrease, shift gas deep shifting reaction, deep shift gas heat exchange and temperature decrease, deep shift gas gas-liquid separation, to obtain the first deep shift gas at 240℃. S03, the first deep shift gas at 240°C enters the demineralized water heater 2 and exchanges heat with the demineralized water condensate from the bottom of the deaerator 5 to obtain the second deep shift gas and the high-temperature demineralized water condensate at 160°C. The high-temperature demineralized water condensate at 160°C provides the heat exchange medium for the pre-boiler 1 and the crude gas shift unit. S04, the second deep shift gas enters the first waste heat boiler 3 and the third waste heat boiler 51 respectively, and exchanges heat with the deoxygenated condensate from the bottom of the deaerator 5 to obtain low-grade steam and the third deep shift gas. S05, the second and third deep shifted gas enter the first gas-liquid separator 4 together for gas-liquid separation to obtain the fourth deep shifted gas; S06, the fourth deep shift gas enters the first demineralized water preheater 47 and the second demineralized water preheater 48 in sequence, and exchanges heat with the demineralized water to obtain the fifth deep shift gas at 40°C and the demineralized water condensate at 120°C. The 120°C demineralized water condensate is deoxygenated and defoamed by the deaerator 5 and then provides heat exchange medium for the gas shift device, the first waste heat boiler 3 and the third waste heat boiler 51 respectively. S07, the fifth-depth shift gas at 40°C enters the circulating water heat exchanger 56 and exchanges heat with the circulating water to obtain circulating water condensate and the sixth-depth shift gas. S08, the sixth deep shift gas enters the ammonia washing tower 57 for ammonia absorption, and the resulting seventh deep shift gas goes to the downstream gas separation process system.

[0042] As needed, in step S02 above, the conversion method of the crude gas conversion device includes: First, the 235℃ condensed crude gas produced by the pre-boiler 1 in step S01 enters the second gas-liquid separator 22 for gas-liquid separation to obtain dry crude gas; Second, the dry crude gas enters the crude gas heater 23 and exchanges heat with the 420℃ conversion gas produced from the bottom of the first conversion furnace 24 to obtain 270℃ dry crude gas and 270℃ conversion gas; Third, the 270℃ dry crude gas enters the first conversion furnace 24 for crude gas conversion reaction to obtain 420℃ conversion gas. Fourth, the 270°C dry crude gas enters the medium-pressure waste heat boiler 25 and exchanges heat with the 160°C high-temperature demineralized condensate produced from the top of the demineralized water heater 2 to obtain 80°C shift gas and high-grade saturated steam. Fifth, the 80°C shift gas enters the second shift furnace 26 for deep gas shift reaction to obtain 240°C first deep shift gas. Sixth, the 240°C first deep shift gas enters the second waste heat boiler 27 for heat exchange and cooling, then enters the third gas-liquid separator 28 for gas-liquid separation, and finally enters the demineralized water heater 2 in SO3.

[0043] The above-mentioned crude gas conversion reaction method also includes: the 420°C conversion gas produced at the bottom of the first conversion furnace 24 enters the superheater 38 and exchanges heat with the high-grade saturated steam produced from the left end of the medium-pressure waste heat boiler 25 to obtain 270°C conversion gas and high-grade superheated steam. The 270°C conversion gas also enters the medium-pressure waste heat boiler 25 for heat exchange before entering the second conversion furnace 26. In addition, the reaction heat source produced at the bottom of the second conversion furnace 26 enters the steam drum 39 and exchanges heat with the 160°C high-temperature demineralized water condensate produced from the top of the demineralized water heater 2 to obtain the condensation reaction heat source and high-grade steam. The condensation reaction heat source is returned to the second conversion furnace 26.

[0044] The high-grade superheated steam produced in this invention is used by the steam turbine to generate electricity, and the high-grade steam and low-grade steam provide steam for various equipment in the production system.

[0045] This invention optimizes the heat distribution of demineralized water condensate, allowing for adjustment and distribution of the condensate flow rate as needed. If the heat distribution is shifted forward (the flow rate of demineralized water condensate into the pre-boiler 1 and the crude gas conversion device is greater than the flow rate into the first waste heat boiler 3 and the third waste heat boiler 51), it can be primarily used to produce high-grade steam and high-grade superheated steam (greater than 2.5 MPa). If the heat distribution is shifted backward (the flow rate of demineralized water condensate into the pre-boiler 1 and the crude gas conversion device is less than the flow rate into the first waste heat boiler 3 and the third waste heat boiler 51), it can be primarily used to produce low-grade steam (less than 1.3 MPa), ensuring the lowest overall energy consumption and significantly reducing system operating costs.

[0046] In summary, the above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A high-efficiency heat recovery device based on crude gas conversion, characterized in that... The system includes a pre-fired boiler, a crude gas conversion unit, a demineralized water heater, a first waste heat boiler, a first gas-liquid separator, a deaerator, and a demineralized water preheating unit. The inlet of the pre-fired boiler is fixedly connected to a first crude gas pipeline. The outlet of the pre-fired boiler is fixedly connected to the first inlet of the crude gas conversion unit via a second crude gas pipeline. The outlet of the crude gas conversion unit is fixedly connected to the inlet of the demineralized water heater via a first deep gas conversion pipeline. The outlet of the demineralized water heater is fixedly connected to the upper inlet of the first gas-liquid separator via a second deep gas conversion pipeline. The first deep gas conversion pipeline is fixedly connected to the inlet of the first waste heat boiler via a third deep gas conversion pipeline. The outlet of the first waste heat boiler is fixedly connected to the second deep gas conversion pipeline via a fourth deep gas conversion pipeline. The top outlet of the first gas-liquid separator is fixedly connected to the inlet of the demineralized water preheating unit via a fifth deep gas conversion pipeline. The outlet of the demineralized water preheating unit is fixedly connected to a sixth deep gas conversion pipeline. The top outlet of the demineralized water preheating unit is fixedly connected to the top inlet of the deaerator via a first condensate pipeline.

2. The high-efficiency heat recovery device based on crude gas conversion according to claim 1, characterized in that... A second condensate pipeline is fixedly connected between the bottom outlet of the deaerator and the second inlet of the crude gas conversion unit. A third condensate pipeline is fixedly connected between the second condensate pipeline and the bottom inlet of the first waste heat boiler. A first low-grade steam pipeline is fixedly connected to the top outlet of the first waste heat boiler. A fourth condensate pipeline is fixedly connected between the second condensate pipeline between the third condensate pipeline and the second inlet of the crude gas conversion unit and the bottom inlet of the demineralized water heater. A fifth condensate pipeline is fixedly connected between the top outlet of the demineralized water heater and the top inlet of the pre-fired boiler. A first high-grade steam pipeline is fixedly connected to the top outlet of the pre-fired boiler. A sixth condensate pipeline is fixedly connected between the fifth condensate pipeline and the third inlet of the crude gas conversion unit.

3. The high-efficiency heat recovery device based on crude gas conversion according to claim 1 or 2, characterized in that... The crude gas conversion unit includes a second gas-liquid separator, a crude gas heater, a first conversion furnace, a medium-pressure waste heat boiler, a second conversion furnace, a second waste heat boiler, and a third gas-liquid separator. A second crude gas pipeline is fixedly connected between the top outlet of the pre-fired boiler and the upper inlet of the second gas-liquid separator. A third crude gas pipeline is fixedly connected between the top outlet of the second gas-liquid separator and the inlet of the crude gas heater. A fourth crude gas pipeline is fixedly connected between the outlet of the crude gas heater and the top inlet of the first conversion furnace. A first conversion gas pipeline is fixedly connected between the bottom outlet of the first conversion furnace and the bottom inlet of the crude gas heater. The top outlet of the crude gas heater is connected to the medium-pressure waste heat boiler. A second shift gas pipeline is fixedly connected between the top inlets and the bottom outlet of the medium-pressure waste heat boiler and the top inlet of the second shift furnace. A third shift gas pipeline is fixedly connected between the bottom outlet of the second shift furnace and the inlet of the second waste heat boiler. A seventh deep shift gas pipeline is fixedly connected between the outlet of the second waste heat boiler and the upper inlet of the third gas-liquid separator. A second condensate pipeline is fixedly connected between the bottom outlet of the deaerator and the bottom inlet of the second waste heat boiler. A second low-grade steam pipeline is fixedly connected between the top outlet of the second waste heat boiler and the inlet of the demineralized water heater. A first deep shift gas pipeline is fixedly connected between the top outlet of the third gas-liquid separator and the inlet of the demineralized water heater.

4. The high-efficiency heat recovery device based on crude gas conversion according to claim 3, characterized in that... The crude gas conversion unit also includes a superheater and a steam drum. A fourth conversion gas pipeline is fixedly connected between the first conversion gas pipeline and the superheater inlet. A fifth conversion gas pipeline is fixedly connected between the superheater outlet and the second conversion gas pipeline. A heat source input pipeline is fixedly connected between the lower outlet of the second converter and the bottom inlet of the steam drum. A heat source return pipeline is fixedly connected between the top outlet of the steam drum and the upper inlet of the second converter. A sixth condensate pipeline is fixedly connected between the fifth condensate pipeline and the top inlet of the steam drum. A high-grade steam pipeline is fixedly connected to the bottom outlet of the steam drum. A seventh condensate pipeline is fixedly connected between the sixth condensate pipeline and the inlet of the medium-pressure waste heat boiler. A high-grade saturated steam pipeline is fixedly connected between the outlet of the medium-pressure waste heat boiler and the bottom inlet of the superheater. A high-grade superheated steam pipeline is fixedly connected to the top outlet of the superheater.

5. The high-efficiency heat recovery device based on crude gas conversion according to claim 1, 2, or 4, characterized in that... The demineralized water preheating device includes a first demineralized water preheater and a second demineralized water preheater. A fifth deep gas-changing pipeline is fixedly connected between the top outlet of the first gas-liquid separator and the inlet of the first demineralized water preheater. A ninth deep gas-changing pipeline is fixedly connected between the outlet of the first demineralized water preheater and the inlet of the second demineralized water preheater. A sixth deep gas-changing pipeline is fixedly connected to the outlet of the second demineralized water preheater. A first demineralized water input pipeline is fixedly connected to the top inlet of the second demineralized water preheater. A second demineralized water input pipeline is fixedly connected to the bottom inlet of the first demineralized water preheater. An eighth condensate pipeline is fixedly connected between the bottom outlet of the second demineralized water preheater and the second demineralized water input pipeline. A first condensate pipeline is fixedly connected between the top outlet of the first demineralized water preheater and the top inlet of the deaerator.

6. The high-efficiency heat recovery device based on crude gas conversion according to claim 5, characterized in that... It also includes a third waste heat boiler, a tenth deep gas pipeline that is fixedly connected between the third deep gas pipeline and the inlet of the third waste heat boiler, an eleventh deep gas pipeline that is fixedly connected between the outlet of the third waste heat boiler and the second deep gas pipeline between the outlet of the demineralized water heater and the fourth deep gas pipeline, a ninth condensate pipeline that is fixedly connected between the second condensate pipeline between the fourth condensate pipeline and the third condensate pipeline and the bottom inlet of the third waste heat boiler, and a third low-grade steam pipeline that is fixedly connected to the top outlet of the third waste heat boiler.

7. The high-efficiency heat recovery device based on crude gas conversion according to claim 6, characterized in that... It also includes a circulating water heat exchanger and an ammonia washing tower. The outlet of the second demineralized water preheater is fixedly connected to the circulating water heat exchanger via a sixth deep gas-changing pipeline. The outlet of the circulating water heat exchanger is fixedly connected to the upper inlet of the ammonia washing tower via a twelfth deep gas-changing pipeline. The bottom inlet of the circulating water heat exchanger is fixedly connected to a circulating water input pipeline. The top outlet of the circulating water heat exchanger is fixedly connected to a circulating water output pipeline. The top of the ammonia washing tower is fixedly connected to a thirteenth deep gas-changing pipeline.

8. The high-efficiency heat recovery device based on crude gas shift according to claim 6 or 7, characterized in that... A first control valve is fixedly installed on the third deep gas pipeline between the first deep gas pipeline and the tenth deep gas pipeline, and a second control valve is fixedly installed on the fourth condensate pipeline.

9. The high-efficiency heat recovery device based on crude gas conversion according to claim 8, characterized in that... A third control valve is fixedly installed on the third condensate pipeline, and a fourth control valve is fixedly installed on the ninth condensate pipeline.

10. A method for efficient heat recovery using the apparatus according to any one of claims 1 to 9, characterized in that... include: S01, the crude coal gas enters the pre-fired boiler and exchanges heat with the high-temperature demineralized condensate produced from the top of the demineralized water heater to obtain high-grade steam and condensed crude coal gas. S02, the condensed crude gas enters the crude gas conversion unit for conversion reaction, including: crude gas gas-liquid separation, crude gas heat exchange and temperature increase, crude gas conversion reaction, conversion gas heat exchange and temperature decrease, conversion gas deep conversion reaction, deep conversion gas heat exchange and temperature decrease, deep conversion gas gas-liquid separation, to obtain the first deep conversion gas. S03, the first deep shift gas enters the demineralized water heater and exchanges heat with the demineralized water condensate from the bottom of the deaerator to obtain the second deep shift gas and high-temperature demineralized water condensate. The high-temperature demineralized water condensate provides heat exchange medium for the pre-boiler and the crude gas shift unit. S04, the second deep shift gas enters the first waste heat boiler and the third waste heat boiler respectively, and exchanges heat with the deoxygenated condensate from the bottom of the deaerator to obtain low-grade steam and the third deep shift gas. S05, the second and third deep shifted gas enter the first gas-liquid separator for gas-liquid separation to obtain the fourth deep shifted gas; S06, the fourth deep shift gas enters the first demineralized water preheater and the second demineralized water preheater in sequence, and exchanges heat with the demineralized water to obtain the fifth deep shift gas and demineralized water condensate. The demineralized water condensate is deoxygenated and defoamed by the deaerator and then provides heat exchange medium for the gas shifting device, the first waste heat boiler and the third waste heat boiler. S07, the fifth deep shift gas enters the circulating water heat exchanger and exchanges heat with the circulating water to obtain circulating water condensate and the sixth deep shift gas. S08, the sixth deep shift gas enters the ammonia washing tower for ammonia absorption, and the resulting seventh deep shift gas goes to the downstream gas separation process system.

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